GE EX2100 User Manual

Download

GEH-6632

GE Industrial Systems

™

EX2100

Excitation Control

User’s Guide

Document: GEH-6632 Issue Date: 2000-09-30

GE Industrial Systems

™

EX2100

Excitation Control

User’s Guide

Printed in the United States of America.

These instructions do not purport to cover all details or variations in equipment, nor to provide for every possible contingency to be met during installation, operation, and maintenance. If further information is desired or if particular problems arise that are not covered sufficiently for the purchaser’s purpose, the matter should be referred to GE Industrial Systems, Salem, Virginia, USA.

This document contains proprietary information of General Electric Company, USA and is furnished to its customer solely to assist that customer in the installation, testing, operation, and/or maintenance of the equipment described. This document shall not be reproduced in whole or in part nor shall its contents be disclosed to any third party without the written approval of GE Industrial Systems.

Document Identification: GEH-6632

EX2100 is a trademark of General Electric Company, USA. Cimplicity® is a registered trademark of GE Fanuc Automation North America, Inc. Ethernet™ is a trademark of Xerox Corporation. Mate-N-Lok® is a registered trademark of Amp Incorporated. Windows NT® is a registered trademark of Microsoft Corporation.

••••

Safety Symbol Legend

Indicates a procedure, condition, or statement that, if not strictly observed, could result in personal injury or death.

Indicates a procedure, condition, or statement that, if not strictly observed, could result in damage to or destruction of equipment.

Note Indicates an essential or important procedure, condition, or statement.

EX2100 User's Guide GEH-6632 Safety Symbol Legend

••••

This equipment contains a potential hazard of electric shock or burn. Only personnel who are adequately trained and thoroughly familiar with the equipment and the instructions should install, operate, or maintain this equipment.

Isolation of test equipment from the equipment under test presents potential electrical hazards. If the test equipment cannot be grounded to the equipment under test, the test equipment’s case must be shielded to prevent contact by personnel.

To minimize hazard of electrical shock or burn, approved grounding practices and procedures must be strictly followed.

To prevent personal injury or equipment damage caused by equipment malfunction, only adequately trained personnel should modify any programmable machine.

Safety Symbol Legend GEH-6632 EX2100 User’s Guide

Reader Comments

General Electric Company

We welcome comments and suggestions to make this publication more useful.

To: GE Industrial Systems

Documentation Design, Rm. 291 1501 Roanoke Blvd. Salem, VA 24153-6492 USA

Fax: 1-540-387-8651 (GE Internal DC 8-278-8651)

Your Name Today’s Date

Your Company’s Name and Address Job Site

GE Requisition No.

Publication No.Your Job Function / How You Use This Publication

Publication Issue/Revision Date

General Rating

Excellent Good Fair Poor Additional Comments

Contents ¡¡¡¡_____________________________________________________________ Organization ¡¡¡¡_____________________________________________________________ Technical Accuracy ¡¡¡¡_____________________________________________________________ Clarity ¡¡¡¡_____________________________________________________________ Completeness ¡¡¡¡_____________________________________________________________ Drawings / Figures ¡¡¡¡_____________________________________________________________ Tables ¡¡¡¡_____________________________________________________________ Referencing ¡¡¡¡_____________________________________________________________ Readability ¡¡¡¡_____________________________________________________________

If needed, how can we contact you? Fax No. Phone No. E-mail

Address

Specific Suggestions

Page No. Comments

______ __________________________________________________________________________________

Other Comments (What you like, what could be added, how to improve, and such.) ________________________________________________

___________________________________________________________________________________________

Overall grade (Compared to publications from other manufacturers of similar products, how do you rate this publication?)

¡ Superior ¡ Comparable ¡ Inferior ¡ Do not know Comment ____________________________________________

(Corrections, information that could be expanded on, and such.)

Detach and fax or mail to the address noted above.

.........................................................................Fold here and close with staple or tape ..........................................................................................

____________________________

GE Industrial Systems

Documentation Design, Rm. 291 1501 Roanoke Blvd. Salem, VA 24153-6492 USA

...........................................................................................

Place stamp here.

Fold here first.........................................................................................................

••••

Chapter 1 Equipment Overview 1-1

Introduction............................................................................................................................ 1-1

System Overview ................................................................................................................... 1-2

Hardware Overview ...............................................................................................................1-5

Software Overview................................................................................................................. 1-6

Technical Characteristics .......................................................................................................1-6

How to Get Help .................................................................................................................... 1-8

Related Documents ................................................................................................................ 1-8

Chapter 2 Functional Description 2-1

Introduction............................................................................................................................ 2-1

Exciter Hardware ................................................................................................................... 2-2

Exciter Configurations ........................................................................................................... 2-3

Power Conversion Cabinet..................................................................................................... 2-5

Auxiliary Cabinet................................................................................................................... 2-8

Control Cabinet.................................................................................................................... 2-10

Exciter Software................................................................................................................... 2-17

Operator Interface ................................................................................................................2-23

Document Distribution............................................................................................. 1-8

Manual Ac Disconnect (Optional)...........................................................................2-5

Power Conversion Module (PCM).............................................................................2-5

Gate Pulse Amplifiers (EGPA Board) ..................................................................... 2-6

Main Dc Contactors. 41A or 41A/41B (Optional)................................................... 2-7

Free Wheeling Diode De-excitation ........................................................................ 2-7

Ac Line-to-Line Filters ............................................................................................ 2-8

De-excitation Module (EDEX) ................................................................................ 2-8

Shaft Voltage Suppressor......................................................................................... 2-9

Field Flashing Module ............................................................................................. 2-9

Field Ground Detector (EXAM and EGDM)........................................................... 2-9

High Voltage Interface – HVI.................................................................................. 2-9

Diagnostic Interface (Keypad)............................................................................... 2-10

Control Module...................................................................................................... 2-11

Simplex Control System ........................................................................................ 2-12

Redundant Control System .................................................................................... 2-13

Control Power Supplies ......................................................................................... 2-14

Auto Reference – AUTO REF............................................................................... 2-20

AVR Setpoint – EXASP ........................................................................................ 2-20

Automatic Voltage Regulator – AVR.................................................................... 2-20

Manual Reference – MANUAL REF .................................................................... 2-21

Field Voltage and Current Regulators - FVR & FCR............................................ 2-21

Under Excitation Limiter – UEL ........................................................................... 2-22

Power System Stabilizer – PSS.............................................................................. 2-22

Turbine Control HMI.............................................................................................2-23

Control System Toolbox (toolbox)........................................................................2-23

EX2100 User’s Guide GEH-6632 Contents

••••

Chapter 3 Printed Wiring Boards Overview 3-1

Introduction............................................................................................................................ 3-1

Control Boards ....................................................................................................................... 3-2

Exciter Backplane (EBKP) ...................................................................................... 3-2

Digital Signal Processor Board (DSPX) .................................................................. 3-2

ACLA Board............................................................................................................ 3-4

EISB Board.............................................................................................................. 3-4

EMIO Board ............................................................................................................ 3-4

ESEL Board............................................................................................................. 3-5

I/O Terminal Boards .............................................................................................................. 3-5

EPCT Board............................................................................................................. 3-5

ECTB Board ............................................................................................................ 3-6

EXTB Board ............................................................................................................ 3-6

EDCF Board ............................................................................................................ 3-6

EACF Board ............................................................................................................ 3-7

Bridge and Protection Boards and Modules........................................................................... 3-7

EGPA Board ............................................................................................................ 3-7

EXCS Board ............................................................................................................ 3-7

EDEX Board............................................................................................................ 3-8

EGDM Module ........................................................................................................ 3-8

EXAM Module ........................................................................................................ 3-9

Power Supply Boards.............................................................................................................3-9

EPDM Module......................................................................................................... 3-9

EPBP Backplane...................................................................................................... 3-9

EPSM Module ....................................................................................................... 3-11

DACA – Ac to Dc Converter................................................................................. 3-11

Related Board Publications.................................................................................................. 3-11

Chapter 4 Terminal Board I/O and Equipment Connections 4-1

Introduction............................................................................................................................ 4-1

Power Connections and Analog I/O....................................................................................... 4-2

Power Potential Transformer Inputs ........................................................................ 4-3

Potential and Current Transformer Inputs................................................................ 4-3

Analog Input ............................................................................................................ 4-3

Customer Contact I/O ............................................................................................................4-4

Power Supply Inputs .............................................................................................................. 4-6

Line Filter Connections.......................................................................................................... 4-7

Exciter Internal I/O ................................................................................................................ 4-8

Exciter AC Feedback............................................................................................... 4-8

Exciter DC Feedback ............................................................................................... 4-8

De-Excitation ....................................................................................................................... 4-11

Crowbar................................................................................................................................ 4-14

Field Ground Detector.......................................................................................................... 4-14

Field Flashing....................................................................................................................... 4-16

Dc Field Flashing Settings ..................................................................................... 4-16

Flashing Control Sequence .................................................................................... 4-16

Shaft Voltage Suppressor..................................................................................................... 4-18

Data Highway Connections.................................................................................................. 4-19

Control System Toolbox Connection................................................................................... 4-20

Chapter 5 Diagnostic Interface-Keypad 5-1

Introduction............................................................................................................................ 5-1

Using the Pushbuttons............................................................................................................ 5-2

Reading the Display ............................................................................................................... 5-5

Contents GEH-6632 EX2100 User’s Guide

••••

Changing Display Units........................................................................................... 5-7

Adjusting Display Contrast...................................................................................... 5-7

Status Screen .......................................................................................................................... 5-8

Reading the Meters .................................................................................................. 5-8

Alternate Status Screen (Display I/O).................................................................................... 5-8

Using the Menus .................................................................................................................... 5-9

Viewing and Resetting Faults ................................................................................................ 5-9

Editing Parameters ............................................................................................................... 5-10

Parameter Backup.................................................................................................. 5-11

Firmware and Hardware Information................................................................................... 5-13

Protecting the Keypad.......................................................................................................... 5-14

Modifying the Protections...................................................................................... 5-14

Appendix A Warranty and Renewal Parts A-1

Introduction........................................................................................................................... A-1

Identifying the Part................................................................................................................ A-2

Renewal Parts List .................................................................................................. A-2

Part Number Structure ............................................................................................ A-2

Warranty Terms .................................................................................................................... A-4

How to Order Parts ............................................................................................................... A-5

Data Nameplate....................................................................................................... A-5

ML Number ............................................................................................................ A-5

Appendix B Ratings and Specifications B-1

Glossary of Terms

Index

EX2100 User’s Guide GEH-6632 Contents

iii

••••

Notes

Contents GEH-6632 EX2100 User’s Guide

••••

Chapter 1 Equipment Overview

Introduction

The EX2100ä Excitation Control (EX2100 or exciter) produces the field excitation

current to control generator ac terminal voltage and/or the reactive volt-amperes. It is

a full static excitation system designed for generators on both new and retrofit steam,

gas, and hydro turbines.

This chapter introduces the exciter and defines the document contents. Its purpose is

to present a general product overview as follows:

Section/Topic Page

System Overview..................................................................................................... 1-2

Hardware Overview................................................................................................. 1-5

Software Overview .................................................................................................. 1-6

Technical Characteristics......................................................................................... 1-6

How to Get Help...................................................................................................... 1-8

Related Documents.................................................................................................. 1-8

Document Distribution ..................................................................................... 1-8

Chapter 2 Functional Description

Chapter 3 Printed Wiring Boards Overview

Chapter 4 Terminal Boards I/O and Equipment Connections

Chapter 5 Diagnostic Interface (Keypad)

Appendix A Warranty and Renewal Parts

Appendix B Ratings and Specifications

Glossary

EX2100 User’s Guide GEH-6632 Chapter 1 Equipment Overview

1-1

••••

System Overview

The exciter is a flexible modular system that can be assembled to provide a range of available output currents and several levels of system redundancy. These options include power from a potential, compound, or auxiliary source. Single or multiple bridges, warm backup bridges, and simplex or redundant controls are available. An overview of the turbine generator excitation system is shown in Figure 1-1.

Power for the exciter is drawn from a power potential transformer connected to the generator terminals, or from an excitation transformer connected to an auxiliary bus. Generator line current and stator output voltage are the primary feedbacks to the exciter, and dc voltage and current is the controlled output to the exciter field.

The architecture supports Ethernet LAN (Unit Data Highway) communication with other GE equipment including the GE Control System Toolbox (toolbox) for configuration, the turbine control, the LCI Static Starter, and the HMI (operator interface).

Figure 1-2 is a simplified one line diagram of the exciter showing the power source, generator current and voltage measurements, control module, power conversion module (PCM), and protection circuits. In the potential source system, the secondary of the PPT is connected to the input of a 3-phase full-wave inverting thyristor bridge. The inverting bridge provides both positive and negative forcing voltage for optimum performance. Negative forcing provides fast response for load rejection and de-excitation.

Either simplex or redundant control is available.

Excitation control results from phase controlling the output of the SCR bridge circuit. The SCR firing signals are generated by digital regulators in the controller. In the redundant control option (Figure 1-2), either M1 or M2 can be the active master control, while C monitors both to determine which should be the active and which the standby controller. Dual independent firing circuits and automatic tracking is used to ensure a smooth transfer to the standby controller.

1-2

Chapter 1 Equipment Overview GEH-6632 EX2100 User’s Guide

••••

Turbine

)

Generator

Transmission Line

Step-up Transformer

ir Circuit Breaker (52G)

Current Transformers (CTs)

Potential Transformers (PTs)

Exciter Power Potential Transformer (PPT

Controlled dc to Field

Data Highway to Turbine Control, HMI, & DCS

EX2100 Exciter

Power Conversion

Module (Bridge)

Control,

Sequencing,

Protection

c Source

Figure 1-1 Overview of Generator and Exciter System

Instrumentation

EX2100 User’s Guide GEH-6632 Chapter 1 Equipment Overview

1-3

••••

ACA

Load

ACA

Aux

Generator

PCT (3)

Customer I/O

C CB

Source

Compound

Source only

Line Filter

Current

Voltage

Bridge I/O

PPT

Linear Reactors (3)

C CB o

Disconnect

Diagnostic

Interface (Keypad)

Control

Data

Highway

Control

Gating Selector

Unit

I/O

CDC

Control

Power

Supplies

Control

ctive Field

Ground Detector

Deexcitation

Crowbar

Shaft Voltage Suppression

Figure 1-2. Exciter One Line Diagram

Power Conversion Modules (Bridge)

Flashing

Control

DC CB or Contactor

Shunt

PT: Potential Transformer CT: Current Transformer CB: Circuit Breaker I/O: Input/Output PCT: Power Current Transformer PPT: Power Potential Transformer

1-4

Chapter 1 Equipment Overview GEH-6632 EX2100 User’s Guide

••••

Hardware Overview

The EX2100 hardware is contained in three cabinets as follows:

• control cabinet for the control, communication, and I/O boards

• auxiliary cabinet for field flashing and protection circuits such as de-excitation

• power conversion cabinet for the power SCR cells, cooling fans, dc contactors,

The exciter's power converter consists of bridge rectifiers, resistor/capacitor filter

configurations, and control circuitry. An outside view of the cabinets is shown in

Figure 1-3. The components and bridge size vary for different excitation systems and

for the power output required.

and shaft voltage suppression

and ac disconnect

Control

Cabinet

Keypads

Auxiliary

Cabinet

Contactors &

Disconnects

Fan Drawers

Power Conversion Cabinet

Figure 1-3. Exciter Cabinets

EX2100 User’s Guide GEH-6632 Chapter 1 Equipment Overview

1-5

••••

Software Overview

Microprocessor-based controllers (ACLA and DSPX) execute the exciter control code. The software consists of modules (blocks) combined to create the required system functionality. Block definitions and configuration parameters are stored in flash memory, while variables are stored in random-access memory (RAM).

The exciter application software emulates traditional analog controls. It uses an open architecture system, with a library of existing software blocks configured from the toolbox. The blocks individually perform specific functions, such as logic gates, proportional integral (P.I.) regulators, function generators, and signal level detectors. The control selects one of two modes, either generator voltage regulation (Auto Regulation), or direct control (voltage or current, depending upon the application). Generator protection functions are integrated into the control, including over and under-excitation limiting, power system stabilization, and V/Hz limiting.

The blocks can be interrogated while the exciter is running by using the toolbox. The dynamically changing I/O values of each block can be observed in operation, which is valuable during startup or troubleshooting.

Technical Characteristics

Summary characteristics for the EX2100 are as follows; for further details refer to Appendix B.

Unit Specific ratings are provided on equipment nameplate and supercede all information herein.

EX2100 Characteristics Description

Power Converter Module (PCM)

Single bridge rating 1,000 and 2,000 A dc at up to 1,000 V ac

Parallel bridge rating 8,000 A dc at up to 1,500 V ac; with up to 6 bridges

Forcing requirements 150% of design Amperes (EDA) for 30 s at 40 ºC

Power Sources

Power for the PCM – Voltage source

Power Input for the PCM - VA 3251 kVA (1,000 V version)

Power for the PCM - Frequency 3-phase 50/60 Hz

Flashing power Battery source 125 V dc or 250 V dc, with up to 200 A for at least 10 s

Control power

Auxiliary bus Generator terminals Compound source 600 or 1,000 V ac versions

240 or 480 V ac, 50/60 Hz single-phase auxiliary source

For two ac sources, or one ac and one dc source: Nominal 120 V ac ±15%, with 1 DACA, 10 A rms max. Battery source, 125 V dc, range 80 – 140 V dc, 10.6 A dc max.

1-6

Chapter 1 Equipment Overview GEH-6632 EX2100 User’s Guide

••••

Input/Output QTY

Potential transformers (PTs) 2 3-phase standard, single phase available

120 V ac nominal 1 VA nominal burden

Current transformers (CTs, 1 or 5 A) 2 Any two phases, single phase available

1 VA nominal burden

86G dedicated contact input 1 open for trip

52G dedicated contact input 1 closed for online

Trip rated contact outputs 2 At 125 V dc with relay break characteristics:

Resistive load 0.5 A Inductive load 0.2 A

General Purpose contact inputs

6 Customer contacts, 70 V dc supplied by ECTB

General Purpose Form C contact outputs

± 10 V differential amplifier input 1

Thermal

Base controls cabinet Continuous operation in a 0 to 40 ºC ambient environment, with 5 to

Base power conversion and auxiliary cabinet

Cabinet Dimensions & Weight

Redundant control with dual PCM redundant converter in a three-cabinet lineup

Weight of Converter cabinet 3,600 lbs

Weight of Total Lineup (Converter, Control, and Auxiliary cabinets)

Cabinet type, control & auxiliary enclosures

Cabinet type, power conversion NEMA 1 (IEC IP 20), forced air cooled

4 At 125 V dc with relay break characteristics:

Resistive load 0.5 A Inductive load 0.1 A

95% humidity, non-condensing

Continuous operation in a 0 to 40 ºC ambient environment, with 5 to 95% humidity, non-condensing

Width 141.74 in (3600 mm) Height 104.32 in (2650 mm) Depth 31.5 in (800 mm)

5,600 lbs

NEMA 1 (IEC IP 20), convection cooled

Power and Control Cable Access Entrances from the top and/or bottom

EX2100 User’s Guide GEH-6632 Chapter 1 Equipment Overview

1-7

••••

How to Get Help

“+” indicates the international access code required when calling from outside of the USA.

If help is needed beyond the instructions provided in the drive system documentation, contact GE as follows:

Chapter 2 Functional Description

Introduction

This chapter describes the function of the EX2100 static exciter and the individual

control and protection circuits. Power supplies and the distribution of power is also

covered. The functional description information is organized as follows:

Section Page

Exciter Hardware ..................................................................................................... 2-2

Exciter Configurations............................................................................................. 2-3

Power Conversion Cabinet ...................................................................................... 2-5

Manual Ac Disconnect (Optional).................................................................... 2-5

Power Converter Module (PCM)...................................................................... 2-5

Gate Pulse Amplifiers (EGPA Board) .............................................................. 2-6

Main Dc Contactors. 41A or 41A/41B (Optional)............................................ 2-7

Free Wheeling Diode De-excitation ................................................................. 2-7

Auxiliary Cabinet..................................................................................................... 2-8

Ac Line-to-Line Filters..................................................................................... 2-8

De-excitation Module (EDEX)......................................................................... 2-8

Shaft Voltage Suppressor.................................................................................. 2-9

Field Flashing Module...................................................................................... 2-9

Field Ground Detector (EXAM and EGDM) ................................................... 2-9

High Voltage Interface – HVI .......................................................................... 2-9

Control Cabinet...................................................................................................... 2-10

Diagnostic Interface (Keyad).......................................................................... 2-10

Control Module............................................................................................... 2-11

Simplex Control System................................................................................. 2-12

Redundant Control System............................................................................. 2-13

Control Power Supplies .................................................................................. 2-14

Exciter Software .................................................................................................... 2-17

Auto Reference – AUTO REF........................................................................ 2-20

AVR Setpoint – EXASP................................................................................. 2-20

Automatic Voltage Regulator – AVR............................................................. 2-20

Manual Reference – MANUAL REF ............................................................. 2-21

Field Voltage and Current Regulators - FVR & FCR..................................... 2-21

Under Excitation Limiter – UEL .................................................................... 2-22

Power System Stabilizer – PSS ...................................................................... 2-22

Human Machine Interface (HMI) .......................................................................... 2-23

Mark VI HMI.................................................................................................. 2-23

Toolbox........................................................................................................... 2-23

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-1

••••

Exciter Hardware

The EX2100 exciter consists of the following basic components.

• Power Conversion Module (PCM) and cooling fans

• Power potential transformer (PPT) (mounted separate from exciter)

• Line-to-line filters

• Shaft voltage suppressor

• De-excitation module

• Diagnostic Interface (keypad)

• Controllers and I/O boards

• Control power supplies

Optional components that can be added to the exciter are:

• Warm backup bridge configuration

• Multibridge configuration for high current requirements

• Compound power source (separate from exciter)

• Auxiliary power source (bus-fed)

• Crowbar module (for hydro and other special applications)

• Dc Disconnect

• Field ground detector

• Redundant ac source for power supply

• Ac disconnect

• Field flashing module

• Redundant controllers providing a Triple Modular Redundant (TMR) system

• GE Control System Toolbox (toolbox) for configuration

The control hardware is basically the same for the different types of excitation. The power conversion hardware is defined by application requirements, which therefore determines the exciter bridge size.

2-2

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

Exciter Configurations

EX2100 Exciters can be supplied with single or redundant control, and with single or

redundant bridges. Variations of the single control type are shown in Figure 2-1.

Simplex Control with

Single PCM

Control with

I/O and

Operator

Keypad

PCM

Simplex Control with

Control with

I/O and

Operator

Keypad

Figure 2-1. Simplex Control Configurations

PCM1PCM2PCM3PCM4PCM5PCM

Parallel PCMs

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-3

••••

Exciters with dual (redundant) control are shown in Figure 2-2. Multiple PCMs can be supplied in simplex, warm backup, or redundant n+1 or n+2 modes (with n+1 or n+2 equal to 6).

Dual Control with

Single PCM

M1 Control,

I/O and

Operator

Keypad

M2 Control,

I/O and

Operator

Keypad

C Control Selection

Logic &

Protection

Dual Control with Parallel PCMs

M1 Control,

I/O and

Operator

Keypad

PCM

Dual Control with

Warm Backup PCMs

M1 Control,

I/O and

Operator

Keypad

M2 Control,

I/O and

Operator

Keypad

C Control Selection

Logic &

Protection

PCM

PCM PCM

PCM

M2 Control,

I/O and

Operator

Keypad

C Control Selection

Logic &

Protection

Figure 2-2. Dual Control System Configurations

2-4

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

Power Conversion Cabinet

The Power Conversion cabinet contains the Power Conversion Module (PCM), the

Exciter Gate Pulse Amplifier (EGPA) board, ac circuit breaker, and the dc circuit

contactor. Three-phase power for the PCM comes from a PPT external to the exciter.

The ac supply comes into the cabinet through the ac circuit breaker (if supplied), and

is filtered by 3-phase line filters in the auxiliary cabinet.

Manual Ac Disconnect (Optional)

The manual ac disconnect switch serves as a disconnect device between the

secondary of the power potential transformer and the static exciter. It is a molded

case, 3-phase, non-automatic, panel-mounted switch, which is manually operated for

isolating the ac input supply. It is a no-load disconnect device.

Power Conversion Module (PCM)

The exciter PCM includes the bridge rectifiers, dc leg fuses, thyristor protection

circuitry (for example, snubbers, filters, and fuses) and leg reactor assemblies. The

components vary for different bridge ratings based on the power output required.

Bridge Rectifier

Each bridge rectifier is a 3-phase full-wave thyristor bridge The bridge has six SCRs

(thyristors) controlled by the Exciter Gate Pulse Amplifier board (EGPA) as shown

in Figure 2-3. Heat is dissipated through large aluminum cooling fins and forced air

flow from overhead fans.

Leg Reactors and Cell Snubbers

The commutating reactors are located in the ac legs feeding the SCRs, and the

snubbers are an RC circuit from the anode to the cathode of each SCR. The cell

snubbers, line-to-line snubbers and line reactors together perform the following

functions to prevent misoperation of the SCRs.

• Limit the rate of change of current through the SCRs and provide a current dump

to aid in starting conduction.

• Limit the rate of change in voltage across the cell and, during cell commutation,

limit the reverse voltage that occurs across the cell.

The SCR snubbers include PRV resistors to limit the peak reverse voltage. These

resistors can be removed if required.

Three-phase input power is fed to the bridge from the secondary of the PPT, either

directly or through an ac breaker or disconnect, and a line-to-line filter. With

inverting bridge designs, the bridge is capable of negative forcing voltage, which

provides fast response for load rejection and de-excitation. The dc current output of

the bridge is fed through a shunt, and on some designs a contactor (41A or both 41A

and 41B) to the generator field. The bridge design utilizes dc leg fuses to protect the

SCRs from overcurrrent.

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-5

••••

Current Shunt

EDCF provides dc current and voltage feedback

To dc Breaker, Shunt, and Generator Field +

Ac power Input

A dc shunt provides the bridge output current feedback signal. The mV output signal is input to a differential amplifier on the EDCF board. The amplifier output voltage controls the frequency of an oscillator, which generates a fiber-optic signal sent to the control module. The bridge output voltage feedback signal is generated in a similar way.

FU1A

SCR1

SCR4

FU4A FU4B FU5A

FU1B FU2A FU2B

SCR2

Snubber 1

Snubber 4

SCR5

Snubber 2

Snubber 5

FU5B

FU3A

SCR3

SCR6

FU6A

FU3B

Snubber 3

Snubber 6

FU6B

The gate pulse amplifiers directly control the SCRs.

Gen. Field -

Gate Driver Inputs from EGPA Board

Figure 2-3. Power Bridge

J2 J5

J6J4

Gate Pulse Amplifiers (EGPA Board)

The EGPA board interfaces the control to the Power Bridge. EGPA takes the gate commands from the ESEL board in the controller, and generates the gate firing pulses for six SCRs (Silicon Controlled Rectifiers). It is also the interface for current conduction feedback, and bridge airflow and temperature monitoring.

On a new exciter, an RTD is used to monitor the temperature and generate alarms instead of the Klixon switches. Additional switches actuated by fan rotation monitor cooling air flow across the bridge. On an exciter controls only retrofit, the exciter may have provisions for accepting feedback from two thermal switches mounted on the SCR heatsink assemblies. One thermal switch opens at the alarm level

(170 °F (76 °C)) and the other at the trip level (190 °F (87 °C)). These switches

are wired to the EGPA board and may require retrofitting into the existing bridge. If either switch opens, a bridge overtemperature alarm is generated. If both switches open, a fault and a trip are generated.

2-6

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

Cooling Fan Assembly

The SCR bridge assembly is cooled with forced air. From two to six overhead fans

are used, depending on the bridge rating and redundancy requirements. The fans are

applications, a fan may be replaced while the exciter is running.

Main Dc Contactors. 41A or 41A/41B (Optional)

The main dc contactor (at the output of the power conversion module) provides a

disconnect between the power conversion module and the generator field. The

contactor picks up when the running mode is selected and no fault exists in the

excitation. The contactors are normally actuated using pilot relays on the EXTB

board driven by the controller. The auxiliary contacts from the contactor are routed

back through the EXTB board as feedback signals.

Free Wheeling Diode De-excitation

De-excitation, the dissipation of the field current after the dc contactor opens, can be

done with a free wheeling diode. This diode is connected from the generator field

negative lead (anode) to the positive lead (cathode). The reverse voltage causes

current to flow through the diode, and the field resistance causes the current decay.

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-7

••••

Auxiliary Cabinet

The auxiliary cabinet is located next to the power conversion cabinet and contains modules to protect the generator and provide startup dc power. Modules for filtering the incoming ac power, for de-excitation, shaft voltage suppression, and field flashing are mounted in this cabinet.

Ac Line-to-Line Filters

Fuse protected line-to-line series RC filter circuits (snubbers) are provided to damp the ac system to prevent voltage spikes at the completion of SCR commutation. There are two styles of filters employed depending on the voltage. The 600 V filter uses RC circuits and MOVs. The 1000 V filter uses the 600 V version with additional RC circuits. Refer to Chapter 4 for details and connections.

De-excitation Module (EDEX)

During any shutdown, the energy stored in the generator field must be dissipated. In a normal shutdown, a stop is initiated by an operator. The bridge is fired at retard limit and sufficient time is allowed for the field to decay before the field contactors are opened. During an abort stop (trip), the field contactors are opened immediately. The stored field energy must be dissipated through some other means.

SCR De-excitation Module (EDEX)

For customers requiring a rapid de-excitation, an SCR de-excitation module is provided. In the EDEX module, an SCR is fired to provide a conduction path through the field discharge resistor (or inductor) for the field current to flow and dissipate the field energy.

The de-excitation module has dual independent firing control circuits. Each is activated by a parallel combination of auxiliary contacts representing the status of the field contactor(s), bridge ac supply breaker, and exciter bridge operating state. Any one of these paths can gate the de-excitation SCR which does not conduct unless the field voltage is inverted. If neither firing control circuit can fire the SCR, it is fired on overvoltage when the anode to gate voltage on the SCR exceeds the break over voltage of the breakover diode string connected between the anode and gate. De-excitation modules can be paralleled for larger excitation systems.

Thyrite

In systems that do not use the standard de-excitation module, a thyrite is connected across the dc output buses of the thyristor bridge. This protects the thyristors from high peak inverse voltages, which may occur as a result of abnormal generator operation. These are typically only supplied on salient pole generators.

2-8

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

Shaft Voltage Suppressor

The Shaft Voltage Suppressor protects the shaft bearings.

The field ground detector protects the generator shaft.

Excitation systems, which produce a dc voltage from ac through a solid state

rectification process, produce ripple and spike voltages at the exciter output. Due to

their rapid rise and decay times, these voltages are capacitively coupled from the

field winding to the rotor body. This creates a voltage on the shaft relative to ground.

Shaft voltage, if not effectively controlled, can be damaging to both journals and

bearings. The shaft voltage suppressor is a filter that conducts the high frequency

components of the induced voltages to ground. (This filter is shipped loose in some

cases, otherwise it is part of the lineup).

Field Flashing Module

The field flashing module is provided on generator terminal fed excitation systems. It

supplies initial exciter current and builds generator voltage, supplying approximately

10% - 15% of no-load field current from the station batteries during the startup

sequence. If large machines require ac field flashing, the ac power is supplied

through an isolation transformer. Both designs require customer supplied power.

Field Ground Detector (EXAM and EGDM)

The generator field winding is electrically isolated from ground. The existence of

one ground usually does not damage the rotor. However, the presence of two or

more grounds in the field winding path causes magnetic and thermal imbalances and

localized heating, which may damage the rotor forging or other metallic parts.

The function of the field ground detector is to detect a ground path from any exciter

component connected to and including the main field windings.

The Exciter Attenuator Module (EXAM) drives the electrical center of the field

winding with a low frequency ac voltage relative to ground. To detect the current

flow, the voltage across a sensing resistor is picked up by EXAM and measured by

the EGDM module. This signal is sent over a fiber-optic link to the controller where

it is monitored and alarmed. The EGDM boards (1 for simplex and 3 for redundant)

are mounted in the control power supply module located in the control cabinet.

High Voltage Interface – HVI

The HVI contains the ac and dc bus, plus the line filter fuses. It also contains two

terminal boards providing bridge feedback to the control and the EXAM board. The

EACF board accepts incoming PPT ac voltage and air core CT current signals. It has

transformers to isolate the voltages and produce low level signals. The EDCF board

measures the bridge dc current and voltage, and sends it over fiber-optics to the

control.

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-9

••••

Control Cabinet

The control cabinet contains the keypad control rack, control power distribution module and supplies, and I/O terminal boards.

Diagnostic Interface (Keypad)

A second keypad is provided for redundant controls.

FVR Feedback

FldCurrAmps

Vmag

Freq_Hz

60.00

Navigation

Status

The keypad is a local operator interface that is mounted on the control cabinet door. Refer to Figure 2-4 for a view of the keypad and a summary of the operator and maintenance functions available. Chapter 5 describes the keypad in detail.

EX2100 Excitation Control

Exciter Health

0.0 Volts

0.00 Amps

0% 150%

-30%

0% 150%

-30%

Imag

0.000.00

Balance Meter Vars

0.00

Exciter Control

Reset Faults

Command

Voltage Level

EnterEscape

Watts

0.00

100%

Auto

Man

Off

& State Icons

Run (Green)

Stop (Red)

Display:

Status

screens provide analog and digital

representation of exciter functions and values.

screens provide text-based access to

parameters, wizards, and faults.

Pushbuttons:

Organized into functional groups:

Navigation Exciter Control Run

buttons for using the menu

buttons

and

Stop

buttons

Figure 2-4. Diagnostic Interface – Keypad

Start/stop commands, regulator transfer commands, and regulator activation commands can be issued from the keypad. The keypad also includes meter displays indicating system conditions such as generator MW and MVARs, field current and voltage, and regulator balance. Diagnostic displays such as the alarm history display provide system information for maintenance and troubleshooting.

2-10

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

Control Module

The control module is a VME-style rack with boards cable connected to the I/O

terminal boards. This rack is divided into three independently powered sections for

the M1, M2, and C controllers. Each controller consists of control and I/O processor

boards. If the rack contains only the M1 controller then it is a simplex control

system; if the rack contains all three controllers then it is a redundant control system.

The control and I/O processor boards are as follows:

• Microprocessor-based Application Control Layer Module (ACLA) controller,

with LAN Ethernet port

• Microprocessor-based Digital Signal Processor (DSPX) controller

• Exciter ISBus Board (EISB), with fiber-optic communication with the bridge

feedback board

• Exciter Main I/O Board (EMIO), with control of pilot relays and gating

commands to the ESEL board

• Exciter Selector Board (ESEL), with gate pulse distribution from the active

controller to the EGPA.

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-11

••••

Ethernet Data Highway to Mark VI, LCI, and HMI

Simplex Control System

The interconnections between the simplex control and the terminal boards, generator protection modules, and power supply are shown in Figure 2-5. Only one EPSM power supply is used but this can have both ac and dc supplies for increased reliability.

3-phase Voltage Sensing

3-phase Current Sensing

Contact Inputs

Contact Outputs

Keypad

Computer (Tool)

PTPTPT

EPCT

TRIP

TRIPTRIP

8686

2nd

2nd2nd

TRIP

TRIPTRIP

ECTB

70 Vdc

Control Module M1

ACLA

DSPXEISB

Fiber-optic Feedback

EPSM

Power

Supply

5 Vdc

15 Vdc

24 Vdc

EMIO Master I/0

EGDM

Field

Ground

Detector

ESEL

To Flashing panel

41 Device

Deexcitation

Crowbar

125 Vdc

53A

pilot

53B pilot

EXTB

trip

De-ex

pilot

Gate Pulse Amplifier

EGPA

125Vdc

To SCRs

Field Current

EDCF

& Voltage

PPT and air core CT

EACF

ac feedbacks

70 V dc

EXAM

Deexcitation

EDEX

Optional:

Crowbar

125 V dc

Battery

EPDM

Rectified ac

GPA power

Coil Power

125 Vdc

Option:

DACA

Figure 2-5. Simplex Control and Cabling to Terminal Boards

2-12

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

Redundant Control System

A redundant control system has three controllers and three redundant power supplies,

one for each controller. The power supply rack also holds three ground detector

modules. Figure 2-6 shows three EDCF boards, and there can be three EPCT boards,

if required.

Up to two Ethernet cables are connected to the ACLA controllers (one to M1 and

one to M2) for redundant communication with the turbine control and HMIs. Two

keypads are shown connected to M1 and M2. Both keypads have access to the

information in controller C.

Ethernet Data Highway to Turbine Control and HMI

PTPTPT

Fan-out

circuits

EPCT

TRIP

TRIPTRIP

8686

2nd

2nd2nd

TRIP

TRIPTRIP

ECTB

70V

Keypad

Tool

70V

PN24V

EPSM

Power

Supply

ACLA

P24V

DSPX

EISB

E G D M

EMIO Master I/0

70V

PN24V

EPSM

Power

Supply

EBKP

Backplane

M2M1

ESEL

EMIO Master I/0

Bridge 1

Bridge 2

Bridge 3

Bridge 4

Bridge 5

Bridge 6

P24V

E G D M

DSPX

EISB

70V

PN24V

EPSM

Power Supply

P24V

Keypad

ACLA

DSPX

EISB

E G D M

EMIO Master I/O

Fiber-optic Field

EXTB

70V

Gate Pulse Amplifiers

V & I feedback

PPT and air core CT

(AC) Feedbacks

53A

pilot

53A

pilot

53A pilot41close

53B

trip

pilot

53B

trip

pilot

53B

trip

pilot

EACF

EGPA

De-ex

pilot

Option: Field Breaker

125Vdc

EDCF

To Flashi ng panel

41 Device

Deexcitation

Crowbar

-125Vdc

EDEX

EPBP back plane

Field Ground Detector EGDM

EPDM

125 V dc

Battery

Option:

DACA

Rectified ac

125 Vdc

Coil Power

GPA power

De-excitation

EXAM

Attenuator

Optional:

Crowbar

Figure 2-6. Redundant Control System Cabling

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-13

••••

Controller C

Controller C is only used with redundant systems. It is mounted in the control rack and is physically similar to the M1 and M2 controllers, however, C is not responsible for bridge firing and therefore does not contain an ESEL, or ACLA board.

Controller C receives the same feedback voltage and current inputs as the other controllers and contains similar software. Its purpose is to monitor the active and backup controllers (M1 or M2) and initiate appropriate protective responses in the event the system conditions exceed the defined regulation boundaries. Input and output signal voting takes place in all three controllers, which are linked in a Triple Modular Redundant (TMR) controller configuration.

Each controller contains up to six boards, interconnected through the backplane as shown in the simplified diagram of Figure 2-7.

To plant controls

Serial Modbus

Communication across backplane

Ethernet Data Highway (EGD, Modbus)

ACLA

DPM DPM

Figure 2-7. Communication between Redundant Control Boards

DSPX

I/O I/O I/O

ISBus

ACLA

Serial Modbus

DSPX

Control Power Supplies

Redundant supplies provide high reliability.

2-14

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

Power for the controls come from the Exciter Power Distribution Module (EPDM). This is supplied by a 125 V dc source and one or two 115 V ac sources. The ac source is passed through an ac/dc converter (DACA) as shown in Figure 2-8. The resulting 125 V dc is diode coupled with the other dc sources to create a dc bus that feeds the control modules and gate pulse amplifier boards. Fused outputs from the EPDM feed power to the EGPA boards, EXTB, and the Exciter Power Backplane (EPBP). Each output has an LED indication and an on/off isolation switch.

The EPDM mounts on the left side of the Exciter Power Supply rack. Up to three Exciter Power Supply Modules (EPSM) mount in the EPBP backplane and provide logic level power to the controller(s). The EPSMs are fed by 125 V dc from the EPDM, and generate supply voltages of +5 V dc, ±15 V dc, and +24 V dc. In

••••

addition there is an isolated 70 V dc output for use by EXTB and ECTB for contact wetting.

Up to three ground detection modules (EGDM) are also mounted in the EPBP, as shown in Figure 2-9. These communicate with the EXAM module, which is located in the auxiliary cabinet.

Exciter Power Distribution Module (EPDM)

TB1

P125

125

V dc

N125

AC1 Hot

Filter

AC1 Neu.

Filter

115 Vac DACA #1

JDACA1

115 Vac

JDACA1

P125V

N125V

FU1

3.15A

FU2

3.15A

FU3

3.15A

FU4

3.15A

FU5

3.15A

FU6

3.15A

SW1

SW2

SW3

J8A

DS1

DS2

DS3

DS4

J8B

J8C

EGPA1

To EGPA2

EGPA3

EXTB

AC2 Hot

Filter

AC2 Neu.

115

115 Vac DACA #2

JDACA2

Vac

BJS jumper is supplied for isolation of ground reference on systems with external reference

Figure 2-8. Exciter Power Distribution Module

R1 R2

BJS

Chassis

Ground

FU7

FU8

FU9

FU10

FU11

FU12

SW4

SW5

SW6

DS5

DS6

DS7

J1M1

J1M2

J1C

EPSM1

To EPSM2

To EPSM3

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-15

••••

Power to Exciter Backplane

EBKP (Control Rack)

To M1 To M2 To C

Exciter Power Distribution Module EPDM

J1M2J1C

J1M1

EDEX EDCF

EDEX CROWBAR

Blank

plate

CONTROL

J602

MEDIA

FAN

CONV

EDEX

EETB

ECTB

EXTB

EGDM

CONTROL

J602

FAN

MEDIA CONV

EDEX

EETB

ECTB

EXTB

EDEX EDCF

EDEX CROWBAR

EGDM

Fan Fan Fan

EPSM Power Supply

EGDM

Ground

Detector

EPSM Power

Supply

EDEX EDCF

EDEX CROWBAR

EGDM

Ground

Detector

EGDM

CONTROL

J602

FAN

EPSM Power

Supply

MEDIA

CONV

EDEX

EETB

ECTB

EXTB

EGDM

Ground

Detector

To J1M1

J1_M1

To J1M2

J1_M2

To J1C

J1_C

J2C

GROUND

DETECT

125 V dc 115 V ac Supplies

Figure 2-9. Exciter Power Backplane (EPBP) with EPDM, Power Supplies & Ground Detector Modules

2-16

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

Exciter Software

The exciter software is configured and loaded from the toolbox, and resides in the controllers. The software is represented on the toolbox screen by control blocks linked together to show the signal flow. Figure 2-10 is a simplified overview of the exciter control system displaying the main control functions. Both the generator field and stator currents and voltages are measured and input to the control system. In normal operation the ac regulator is selected. Figure 2-11 is the simplified software block diagram displaying the main control blocks.

The generator voltages and currents from the PTs and CTs are wired to the EPCT board, which acts as a signal conditioner to isolate and scale the signals. The conditioned signals are then fed to the controller. Software conversion algorithms use these signals to calculate system variables for use by the regulator, limiter, and protection functions. The outputs from these software calculations include the following:

• Generator voltage magnitude and generator frequency derived from the PTs

• The magnitude of generator current derived from the CTs

• Generator power, P

• Generator reactive volt amperes (VARs), Q

• Change in rotor speed calculated from the integral of accelerating power that is

normally used as the input to the optional Power System Stabilizer (PSS)

• Generator active and reactive current

• Magnitude of generator flux (VHz)

• Line voltage derived from the PTs

• Line frequency derived from line PTs

• Phase angle correlation between the generator and line, derived from generator

and line PTs

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-17

••••

DC Voltage adjust

AC Voltage adjust

Regulator

Voltage/Current

Sensing

Exciter System

Stabilizer Circuits

Over-excitation

Limiter

Under-excitation

Limiter

Exciter

Bridge

Generator

V/Hz Limiter &

Protection

VAR/Power Factor

Control

Voltage Sensing &

Load Compensation

Power System

Stabilizer

Figure 2-10. Control Scheme

2-18

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

External Raise/ Lower

AUTO

REF

Reactive Current

Setpoint

Watts

Slip

Watts

VARs

Generator Terminal Voltage (VMAG)

External Raise/ Lower

Field Volts from Bridge Output

PSS

Power

System

Stabilizer

UEL

Under

Excitation

Limit

MANUAL

REF

EXASP

Exciter AVR

Setpoint.

V/Hz Limit;

Reactive

Current

Compen-

sation.

Frequency

VMAG

Field Voltage Regulator Setpoint

AVR Setpoint and Tracking

Automatic

Voltage

Regulator

FCR Setpoint (User Input)

AVR

FVR Track Value Setpoint

Voltage

Regulator

FVR

Field

FCR

Min.

Firing Commd to Bridge

Field

Field Current from Bridge DC Shunt

Current

Regulator

Figure 2-11. Software Block Diagram

The output of the control software is the firing command, which is sent to the bridge to generate the field current. The individual function blocks are discussed in the following sections.

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-19

••••

Auto Reference – AUTO REF

The AUTOREF block generates an auto (or Auto Control (AC)) setpoint for the Automatic Voltage Regulator (AVR) based on user-supplied parameters and conditions. Raise/lower inputs to AUTO REF come in from the other devices on the Data Highway such as the turbine control or HMI. A variable rate integrator generates the output setpoint within preset limits. The setpoint is combined with other auxiliary stabilizing and protective signals in the EXASP block to form the reference to the AVR block.

AVR Setpoint – EXASP

The EXASP block combines a number of functions to produce the setpoint (reference input) to the AVR, and the AVR tracking value. The EXASP inputs are as follows:

• Stabilizing signal from the PSS block

• Output from the AUTOREF block

• External test signal

• Protective signal generated by the UEL block

• Reactive current input (feedback)

• Voltage magnitude input (feedback)

• Frequency input (feedback)

Generator terminal voltage is controlled by the AVR.

The outputs to the AVR block are the AVR setpoint and tracking value.

Automatic Voltage Regulator – AVR

The AVR block maintains the generator terminal voltage. The setpoint (reference) comes from the EXASP block, and the feedback is the generator voltage. The error value is input to a proportional plus integral (PI) regulator with integrator windup protection, which produces an output signal. Figure 2-12 shows the block diagram. When the AVR is enabled, the AVR output is passed through directly from the track input to the output of the Field Voltage Regulator (FVR).

2-20

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

Preset Condition

Preset Not True

SRQ

Preset State True

Gain Scaling

AVR Setpoint

Status of Regulators

Enable

Generator Voltage

0.05

Error

a b

windup

a>b?

Proportional Gain

Anti-

Integral Gain

Integrator Tracking Input

Preset Value

Output Value

Tracking

Gain r/s

Control

Preset

State

Software

Jumper 0

Integration

Output

Software

Jumper 1

Positive

Limit

Output

Negative

Limit

AVR

Status

Figure 2-12. Automatic Voltage Regulator Block

Manual Reference – MANUAL REF

The MANUAL REF block generates a manual setpoint for the FVR or FCR based on user-supplied parameters and conditions. Raise/Lower inputs to MANUAL REF come in from other control devices on the Data Highway such as the turbine control or HMI.

Field Voltage and Current Regulators - FVR & FCR

The Field Voltage Regulator (FVR) is the typical manual regulator supplied on most applications and uses the generator field voltage as the feedback input. While FVR does permit the current to vary as a function of the field resistance, the FVR makes the manual regulator completely independent from the over excitation limiter. FVR uses the voltage from the generator field as feedback, with a setpoint from the MANUAL REF block. A PI regulator with integral windup protection generates the output. During operation in AVR mode, the output of the AVR is passed directly to the FVR output with no signal conditioning. On units that operate with an inner field

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-21

••••

voltage regulator loop such as compound exciters and some high ceiling exciters, the FVR uses a setpoint from either the AVR or the MANUAL REF block, and is always operational whether in manual or automatic operation.

The Field Current Regulator (FCR) is a special application of the manual regulator and uses the generator field current as the feedback input. The current setpoint is generally switched between a high level and lower level to provide transient forcing capability as well as steady state operation within the capability of the generator. Generally the setpoint is larger than expected field currents and the integral preset is operational. The FCR output is held at positive ceiling until enable becomes true which allows the output to follow the P+I regulator. The bridge firing command is the smaller of the FVR and FCR outputs. While it does regulate constant field current over varying field temperature, FCR is not the standard manual regulator.

Under Excitation Limiter – UEL

The UEL block is an auxiliary control to limit the automatic voltage regulator demand for underexcited reactive current (or reactive power). UEL prevents reduction of the generator excitation to a level where the small-signal (steady state) stability limit, or the stator core end-region heating limit is exceeded. Performance is specified by identifying the region of limiter action on the generator capability curve. There is both a setpoint section and regulator section of the UEL. The two key inputs are generator terminal voltage and real power.

Power System Stabilizer – PSS

The PSS block provides an additional input to the automatic regulator to improve power system dynamic performance. A number of different quantities may be used as inputs to the PSS, such as shaft speed, frequency, synchronous machine electrical power, accelerating power, or some combination of the above. The PSS used with the exciter is multi-input using a combination of synchronous machine electrical power and internal frequency (which approximates rotor speed) to arrive at a signal proportional to rotor speed. This comes from the integral of accelerating power, but with shaft torsional signals greatly attenuated. The input signal is derived entirely from generator terminal quantities without the need for shaft speed transducers. No additional external hardware is required.

2-22

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

Operator Interface

The HMI contains exciter and turbine graphic displays.

An HMI can be mounted in a control console or on a tabletop.

Redundant cable operation is optional and, if supplied, operation continues even if one cable is faulted.

Operator and engineering work stations such as the HMI (Human Machine Interface) and the toolbox communicate with the exciter. This allows operator monitoring and control of the exciter, and engineering access to system diagnostics and control block configuration

Turbine Control HMI

On turbine generator sets that include Mark VI turbine controls, the exciter shares the HMI. The HMI is Windows NT software and communication drivers for the data highways. From the HMI, the operator can initiate commands and view real-time data and alarms on the CIMPLICITY graphic displays. An HMI can be configured as a server or viewer, and can contain tools and utility programs.

The Unit Data Highway (UDH) connects the exciter with the HMI or HMI/Data Server. The network is 10BaseT Ethernet, and uses separately powered network switches. For longer runs, fiber-optic cables can be used.

based with CIMPLICITY operator display

Control System Toolbox (toolbox)

The toolbox is used to configure and maintain the exciter. Control blocks and diagrams can be modified by configuration and loaded into the control. With the exciter online, real-time data is available on the toolbox screen, including control system diagnostics for troubleshooting. The toolbox software runs on an HMI server or a separate PC on the UDH. Direct connection to the controller DSPX board is also possible through the Tool port on the control rack backplane.

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description

2-23

••••

Notes

2-24

Chapter 2 Functional Description GEH-6632 EX2100 User’s Guide

••••

Chapter 3 Printed Wiring Boards Overview

Introduction

This chapter describes the EX2100 printed wiring boards and their operation. These boards fall into four functional groups; control rack boards including controller boards and I/O processors, I/O terminal boards, bridge control and protection modules, and power supply boards. This chapter is organized as follows:

Section Page

Control Boards......................................................................................................... 3-2

EBKP Backplane .............................................................................................. 3-2

DSPX Board ..................................................................................................... 3-2

ACLA Board..................................................................................................... 3-4

EISB Board....................................................................................................... 3-4

EMIO Board ..................................................................................................... 3-4

ESEL Board...................................................................................................... 3-4

I/O Terminal Boards ................................................................................................ 3-5

EPCT Board...................................................................................................... 3-5

ECTB Board ..................................................................................................... 3-5

EXTB Board..................................................................................................... 3-5

EDCF Board ..................................................................................................... 3-6

EACF Board ..................................................................................................... 3-6

Bridge and Protection Boards and Modules............................................................. 3-7

EGPA Board..................................................................................................... 3-7

EXCS Board ..................................................................................................... 3-7

EDEX Board..................................................................................................... 3-7

EGDM Module ................................................................................................. 3-7

EXAM Module ................................................................................................. 3-8

Power Supply Boards............................................................................................... 3-9

EPDM Module.................................................................................................. 3-9

EPBP Backplane............................................................................................... 3-9

EPSM Module .................................................................................................. 3-9

DACA – Ac to Dc Converter.......................................................................... 3-10

Related Board Publications.................................................................................... 3-11

EX2100 User’s Guide GEH-6632 Chapter 3 Printed Wiring Boards Overview

3-1

••••

Control Boards

The control boards are located in the control module. This module consists of the exciter backplane (EBKP) and the metal chassis that holds the boards (refer to Figure 3-1). The control boards are as follows:

• IS200DSPX Digital Signal Processor control board (DSPX)

• IS215ACLA Application Control Layer Module (ACLA)

• IS200EISB Exciter ISBus Board (EISB)

• IS200EMIO Exciter Main I/O board (EMIO)

• IS200ESEL Exciter Selector board (ESEL)

EBKP Backplane

The EBKP provides the backplane for the control boards and the connectors for the I/O terminal board cables. EBKP has three sections for controllers M1, M2, and C. Each section has its own independent power supply. Controllers M1 and M2 have the ACLA, DSPX, EISB, EMIO, and ESEL boards. Section C only has the DSPX, EISB, and EMIO. Two overhead fans cool the controllers.

The upper part of the backplane contains DIN connectors for the plug-in control boards. The lower part of the backplane contains D-SUB connectors for I/O interface cables, and circular DIN connectors for keypad interface cables, power supply plugs, and test rings. Labels on the connectors in Figure 3-1 refer to the boards and devices to which the cables are connected. For more information refer to Chapter 4 and GEI-

100460.

The DSPX performs most of the I/O interface and inner loop bridge control and protection functions

DSPX Board

The DSPX board is the main controller and shares control responsibility with the ACLA. It is a single-slot, 3U high module located in the control rack next to the ACLA. It provides functions including the bridge firing circuit control, I/O processing, and inner loop regulation as follows:

• Field Voltage Regulator (FVR)

• Field Current Regulator (FCR)

• SCR gating signals to the ESEL board

• Start-stop function

• Field flashing control

• Alarms and trip logic

• Generator instrumentation processing

• Generator simulator

For more information refer to Chapter 4 and GEI-100267.

3-2

Chapter 3 Printed Wiring Boards Overview GEH-6632 EX2100 User’s Guide

••••

Fan Fan

RST

OK ACTIVE ENET FLASH

S T A T U S

DSPX

EISB EISB

EMIO ESEL ESEL EMIO

J304 J305 J306 J307 J308 J309

Keypad

Tool M1 Tool M2

A 2

DSPX ACLAACLA

Keypad

RST

ACTIVE ENET FLASH

S T A T U S

DSPX

Keypad

Tool C

EMIOEISB

J315J314

E P C

J405J404 J406 J407 J408 J409

Test Rings M1 Test Rings M2 Test Rings C

E C T B

E G P A

J414 J415

E C

M1-Fan Pwr M2-Fan Pwr C-Fan Pwr

Power

J502

J602

A C

IS200EBKPG1AAA

J509J508J507J506J505J504

E G P A

Power

J510

A C

J610 J612

J512

Power

J515J514

C F

Figure 3-1. Control Module

EX2100 User’s Guide GEH-6632 Chapter 3 Printed Wiring Boards Overview

3-3

••••

ACLA Board

ACLA handles network communications and outer loop functions.

EISB manages all the fiberoptic communication in the cabinets.

The ACLA board is a double-slot, 3U high module located next to the DSPX. ACLA provides Ethernet communications with the turbine control, LCI, and HMI, and runs outer loop control functions including the following:

• Automatic Voltage Regulator (AVR)

• Power System Stabilizer (PSS)

• Under Excitation Limit control (UEL)

• VAR/power factor regulator (VAR/PF)

For more information refer to Chapter 4 and GEI-100434.

EISB Board

The Exciter ISBus Board (EISB) is a special communication interface board for the M1, M2, and C control modules. ISBus is a proprietary, high-speed communication bus used in many GE systems. The EISB is used to provide communication among the 3 DSPSs in M1, M2, and C. EISB receives and transmits fiber-optic feedback signals through the backplane connector. It transmits them over the control backplane to the DSPX controller and also communicates between the DSPX and the tool and keypad ports using RS-232C. EISB is a single-slot, 3U high module that is located in the control rack under the DSPX. From six fiber-optic connectors on the front panel it accepts current and voltage signals from the generator field (and from the exciter if required) using EDCF boards, and receives and transmits signals to the Ground Detection Module (EGDM). For more information refer to Chapter 4 and GEI-100454.

EMIO Board

The EMIO is a single slot, double height VME style board, that manages the I/O from the EPCT, ECTB, EACF, and EXTB terminal boards. The I/O include PT and CT signals, contact inputs, output relay drivers, and pilot trip relay drivers. It also sends logic level gate pulse signals over the backplane to the ESEL board, which sends them to EGPA in the power conversion cabinet. For more information refer to Chapter 4 and GEI-100453.

ESEL Board

The Exciter Selector board receives six logic level gate pulse signals from its corresponding EMIO. These pulse signals drive up to six sets of cables which are distributed to the exciter gate pulse amplifier (EGPA) boards. The EGPA boards are mounted in the power conversion cabinet. If there are redundant controls, two ESEL are used, one driven by M1 and the other by M2. The active ESEL, selected by controller C, sends the necessary control signals to the EGPA boards.

Three groups of ESEL boards are available supporting increasing redundancy levels; ESELH1 contains a single bridge driver, ESELH2 contains three bridge drivers, and ESELH3 contains six bridge drivers. For more information refer to Chapter 4 and GEI-100456.

3-4

Chapter 3 Printed Wiring Boards Overview GEH-6632 EX2100 User’s Guide

••••

I/O Terminal Boards

The exciter terminal boards are as follows:

• IS200EPCT Exciter PT/CT board (EPCT)

• IS200ECTB Exciter Contact Terminal Board (ECTB)

• IS200EXTB Exciter Terminal Board (EXTB)

• IS200EDCF Exciter Dc Feedback board (EDCF)

• IS200EACF Exciter Ac Feedback board (EACF)

EPCT Board

EPCT receives and conditions generator PT and CT feedbacks.

EXTB handles field flashing and protection functions.

The EPCT contains isolation transformers for critical generator voltage and current measurements. Two three-phase generator PT voltage inputs are input to EPCT. Two generator CT current inputs, with current levels of 1 A or 5 A, are input. In addition, one analog input, which can be either 0-10 V or 4-20 mA, is brought into EPCT. All the signals are interfaced to the EMIO board. For more information refer to Chapter 4 and GEI-100459.

ECTB Board

The ECTB board supports excitation contact outputs and contact inputs. There are two versions; the ECTBG1 board which is only used in the redundant mode, and the ECTBG2 board which is only used in the simplex mode. Each board contains two trip contact outputs driving a customer lockout, and four general purpose Form-C relay contact outputs, controlled by the EMIO board. Six auxiliary contact inputs are powered (wetted) with 70 V dc by ECTB. Also, the 52G and 86 G contact inputs are powered and monitored by ECTB. In the redundant case, power comes from the M1 and M2 power supplies. For more information refer to Chapter 4 and GEI-100457.

EXTB Board

The EXTB board supports pilot relay contact outputs, contact inputs, and signal conditioning circuits. EXTB cables to the EMIO board through the EBKP backplane.

Pilot relays for the breaker/contactor close 41, and flashing contactors 53A, and 53B are located on the board, plus pilot relays for the trip relay 41T and the de-excitation relay KDEP. Crowbar status signals and de-excitation status signals from the EDEX board are conditioned on EXTB and sent to EMIO. Three contact inputs from 41, 53A, and 53B are powered (wetted) by 70 V dc on EXTB. Power for the contacts is from the M1 and M2 power supplies (redundantly), and the resulting status signals are sent to EMIO in the control rack. Different groups of EXTB are available for controlling either a field breaker or a contactor in the field circuit. These groups are defined in Table 3-1. For more information refer to GEI-100458.

Table 3-1. EXTB Board Groups

Trip Rela

Type of Redundancy Board Control Mode

Redundant control EXTB G1 Contactor Mode No Yes

Redundant control EXTB G3 Breaker Mode Yes Yes

Simplex control EXTB G2 Contactor Mode No Yes

Simplex control EXTB G4 Breaker Mode Yes Yes

EX2100 User’s Guide GEH-6632 Chapter 3 Printed Wiring Boards Overview

41T used

Close Rela 41 used

3-5

••••

EDCF Board

EDCF handles bridge dc voltage and current feedback.

EACF handles bridge ac voltage and current feedback.

The EDCF board measures field current and field voltage at the SCR bridge, and interfaces to the EISB board in the control panel over a high-speed fiber-optic link. The fiber-optics provides voltage isolation between the two boards, and high noise immunity. Field current is measured using a shunt in the dc field circuit. The field voltage feedback circuit provides seven selector settings to scale down the bridge voltage, depending on the type of bridge application. For more information refer to Chapter 4 and GEI-100464.

EACF Board

The EACF board measures the exciter PPT ac supply voltage and current. The EACF terminal board contains transformers for a 3-phase voltage measurement, and terminals for two Flux/Air core coils. The outputs of the voltage and current circuits are fanned out to three DB9 connectors for cables to controllers M1, M2, and C. These cables can be up to 90 m in length. There are two versions of this board, EACFG1 is for inputs up to 480 V rms, and EACFG2 is for inputs up to 1000 V rms. For more information refer to Chapter 4 and GEI-100465.

3-6

Chapter 3 Printed Wiring Boards Overview GEH-6632 EX2100 User’s Guide

••••

Bridge and Protection Boards and Modules

The exciter bridge and protection boards are as follows:

• IS200EGPA Exciter Gate Pulse Amplifier board (EGPA)

• IS200EXCS Conduction Sensor board (EXCS)

• IS200EDEX Exciter De-Excitation board (EDEX)

• IS200EGDM Exciter Field Ground Detector Module (EGDM)

• IS200EXAM Exciter Attenuator Module (EXAM)

• Crowbar module

EGPA Board

Bridge control passes through EGPA. One EGPA is required per PCM.

EDEX is usually controlled by EXTB, but can initiate deexcitation if control fails.

The EGPA board interfaces the control to the power bridge. EGPA takes the six gate commands from the ESEL and controls the gate firing of up to six SCRs on the bridge. It is also the interface for current conduction feedback, and the bridge airflow and temperature monitoring.

A nominal 125 V dc power source from EPDM supplies an on-board dc/dc converter that provides power for SCR gating over the full range of input supply voltage. LEDs provide visual indication of the status of the output firing, currents into the bridge, gate power supply, line filter, cooling fan rotation, and bridge temperature and alarm or fault conditions. For more information refer to Chapter 4 and GEI-100461.

EXCS Board

The EXCS board has four conduction sensors. It is used to detect the presence of current in the bus. The output is a logic signal.

EDEX Board

The EDEX board is the main board in the de-excitation module. EDEX provides deexcitation SCR firing, conduction sense feedback, and voltage retention to ensure operation in the event of a power failure. EMIO initiates de-excitation on the EXTB board. The EXTB board opens the 41 dc contactor (41A/41B) or breaker, and then transfers de-excitation signals from the auxiliary contacts to SCR firing circuits on the EDEX. There are two types of EDEX. Group 1 board is designed for SCR deexcitation, Group 2 is designed for diode de-excitation. For more information refer to Chapter 4 and GEI-100466.

EGDM Module

EGDM and EXAM work together to detect field ground leakage current.

EX2100 User’s Guide GEH-6632 Chapter 3 Printed Wiring Boards Overview

The EGDM is a double slot, double height (6U) form factor board that mounts in the Exciter Power Backplane rack (EPBP). A simplex system has one EGDM, while a redundant system has three. EGDM detects field leakage resistance from any point in the field circuit of the generator to ground, either on the ac or dc side. The field ground detector applies a low frequency square wave to the sense resistor connected to the field circuit. EXAM, the attenuator module located in the Auxiliary Panel, senses the voltage across the ground resistor and sends the signal to the EGDM through a nine-conductor cable.

3-7

••••

In a redundant system, the set of three EGDM boards are configured as a Controller (C), Master 1 (M1) and Master 2 (M2). The configuration for each EGDM is controlled by a set of program pins on the P2 connector. The C controller receives information from the active DSPX on which EGDM master should provide the drive signal to the sense resistor in the Attenuator Module. The active master receives an Oscillator Signal over the fiber optic link that it converts to a ±50 V signal. This is applied to one end of the sense resistor in the Attenuator Module.

The signal conditioner receives an attenuated (10:1) differential signal from the Sense Resistor. This is a simple unity gain differential amplifier with a high common-mode rejection ratio followed by an A-to-D converter (Voltage Controlled Oscillator VCO). This feeds a fiber-optic transmitter that is cabled to EISB. The signal conditioner circuitry is powered by an isolated power supply to maintain personnel and equipment safety due to the high common-mode voltage at the Sense Resistor. For more information refer to Chapter 4 and GEI-100467.

EXAM Module

The EXAM mounts in the auxiliary cabinet and contains a sense resistor connected to a resistor network across the field. EXAM applies the low frequency ±50 V square-wave signal, supplied from the EGDM, to one end of the sense resistor. The resulting current generates a voltage across the resistor, that is sent back to the EGDM.

In a redundant system, the test signal can come from either, M1 or M2. EXAM has a relay that switches between the two under the control of controller C. A single cable carries the control and sense signals between the EGDM and EXAM modules. For more information refer to Chapter 4 and GEI-100467.

3-8

Chapter 3 Printed Wiring Boards Overview GEH-6632 EX2100 User’s Guide

••••

Power Supply Boards

The exciter power supply boards are as follows:

• IS200EPDM Exciter Power Distribution Module (EPDM)

• IS200EPBP Exciter Power Backplane (EPBP)

• IS200EPSM Exciter Power Supply Module (EPSM)

• DACA Module

EPDM Module

The EPDM provides the power for the control, I/O, and protection boards. It is mounted on the side of the EPBP and accepts a 125 V dc supply from the station battery, and one or two 115 V ac supplies. All supply inputs are filtered. Each ac supply is rectified to 125 V dc in an ac to dc converter (DACA). The resulting two or three dc voltages are diode coupled together to create the dc source supply, designated as P125V and N125V. With the center grounded, these voltages are nominally +62.5 V and –62.5 V to ground.

Any of the exciter power supply modules can be switched off from the EPDM.

Individual supply outputs to the exciter boards are fused. They have an on/off toggle switch, and a green LED indicator to display supply power availability. These outputs supply up to three EGPA boards, the EXTB board, and three EPSM modules serving the three controllers. Outputs are wired to the EPBP for distribution. For more information refer to Chapter 4.

EPBP Backplane

The EPBP holds three electrically isolated power supplies (EPSM) that supply power to the M1, M2, and C controllers. It also holds three EGDM. EPBP accepts 125 V dc from the adjacent EPDM, and distributes logic level power from the three EPSM to the three controllers. Each power supply has an independent ON-OFF switch on the EPDM. The EPSM modules interface to the backplane through DIN connectors. 70 V dc and 24 V dc power is distributed from the locking connectors at the top of the backplane to the terminal boards. Refer to Figure 3-2. For more information refer to Chapter 4 and GEI-100463.

EPSM Module

The EPSM converts 125 V dc from the EPDM into the voltages required for the control system. There are three independent power supplies that supply power to each of the controllers M1, M2, and C. These supplies are located in the power supply module mounted below the control rack in the control cabinet.

The EPSM supplies +5 V dc, ±15 V dc, and +24 V dc to the controller. Power is also supplied to modules external to the control rack as follows:

• ±24 V dc to power the EDEX de-excitation module, crowbar module, EGDM,

and EDCF

• Isolated +70 V dc for contact wetting to the EXTB and ECTB boards

For more information refer to Chapter 4 and GEI-100462.

EX2100 User’s Guide GEH-6632 Chapter 3 Printed Wiring Boards Overview

3-9

••••

EDEX EDCF

J17

J18

EDEX CROW BAR

J16 M1

J19 M1

EGDM

CONTROL

J602

J20

J21M1

MEDIA

FAN

CONV

P101 P201

EDEX

EETB

ECTB

EXTB

EPSM EPSMEPSMEGDM EGDM EGDMBlank plate

J15M1

J14M1

J13M1

J12M1

EDEXEDCF

J17

J18

EDEX

EGDM CROW BAR

P105 P205

J16

J19

P107 P207

CONTROL

J602

J20

J21M2

FAN

MEDIA

CONV

EDEX

EETB

ECTB

EXTB

J15M2

J14M2

J13M2

J12M2

EDEXEDCF

EDEX CROW BAR

P111 P211

J17

J18

J16

J19

EGDM

P113 P213

CONTROL

J602

J20

J21C

FAN

MEDIA

CONV

EDEX

EETB

ECTB

EXTB

J15C

J14C

J13C

J12C

P117 P217

J1_M1 J1_M2

IS200EPBPG1

Figure 3-2. Exciter Power Backplane

DACA – Ac to Dc Converter

The DACA is an ac to dc converter that is powered by a 115 V ac source and produces 125 V dc. The DACA and battery source provide a redundant 125 V dc supply for the EPDM. Two DACAs can be connected to the EPDM if required for greater power supply reliability.

BARCODE

J1_C

J2C

GROUND

DETECT

3-10

Chapter 3 Printed Wiring Boards Overview GEH-6632 EX2100 User’s Guide

••••

Related Board Publications

For a more detailed description of each board's circuitry and application data, refer to the following documents:

• GEI-100460 IS200EBKP Exciter Backplane

• GEI-100267 IS200DSPX Digital Signal Processor Board

• GEI-100434 IS215ACLAH1 Application Control Layer Board

• GEI-100454 IS200EISB Exciter ISBus board

• GEI-100453 IS200EMIO Exciter Main I/O board

• GEI-100456 IS200ESEL Exciter Selector board

• GEI-100459 IS200EPCT Exciter PT/CT board

• GEI-100457 IS200ECTB Exciter Contact Terminal Board

• GEI-100458 IS200EXTB Exciter Terminal Board

• GEI-100464 IS200EDCF Exciter DC Feedback board

• GEI-100465 IS200EACF Exciter AC Feedback board

• GEI-100461 IS200EGPA Exciter Gate Pulse Amplifier board

• GEI-100466 IS200EDEX Exciter De-Excitation board

• GEI-100467 IS200EGDM Exciter Ground Detector Module

• GEI-100463 IS200EPBP Exciter Power Backplane

• GEI-100462 IS200EPSM Exciter Power Supply Module

EX2100 User’s Guide GEH-6632 Chapter 3 Printed Wiring Boards Overview

3-11

••••

Notes

3-12

Chapter 3 Printed Wiring Boards Overview GEH-6632 EX2100 User’s Guide

••••

Chapter 4 Terminal Board I/O and Equipment Connections

Introduction

This chapter describes the customer's equipment connections, and inputs and outputs (I/O) available through terminal board wiring. System cabling to provide desired functionality is also defined. The information is organized as follows:

Section Page

Power Connections and Analog I/O......................................................................... 4-2

Power Potential Transformer Inputs................................................................. 4-3

Potential and Current Transformer Inputs ........................................................ 4-3

Analog Input..................................................................................................... 4-3

Customer Contact I/O .............................................................................................. 4-4

Power Supply Inputs................................................................................................ 4-6

Line Filter Connections............................................................................................ 4-7

Exciter Internal I/O .................................................................................................. 4-8

Exciter AC Feedback........................................................................................ 4-8

Exciter DC Feedback........................................................................................ 4-8

De-Excitation......................................................................................................... 4-11

Crowbar ................................................................................................................. 4-14

Field Ground Detector ........................................................................................... 4-14

Field Flashing ........................................................................................................ 4-16

Dc Field Flashing Settings.............................................................................. 4-16

Flashing Control Sequence............................................................................. 4-16

Shaft Voltage Suppressor....................................................................................... 4-18

Data Highway Connections ................................................................................... 4-19

Control System Toolbox Connection..................................................................... 4-20

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections

4-1

••••

Power Connections and Analog I/O

Figure 4-1 displays a typical connection diagram of the common power and analog I/O for an excitation system.

Customer Supplied

Power

Flow

Generator Field +

To Bridge 1

Generator Field -

PT1

PT2

P RI VA C : 14 40 0

SE C VA C : 12 0

PE N O R

G R O U

N D E D

PE N O R

G R O U

N D E D

PTSW1

PTSW2

CTSW1

CTSW3

Control Cabinet

TB1

TB2

TB3

9 11

PTPTPT

Fa nou t cir cui

EPCT

J3 05

J3 08

J3 15

To EMIO (M1)

To EMIO (M2)

To EMIO (C)

8 10

PPT

KV A 12

Phase Rotation

P RI VA C : 12 47 0

SE C VA C : 65 0

41AC1

Power Conversion Cabinet

To Bridge 1

Note: Circuits shown external to the exciter are for reference only.

Figure 4-1. Exciter AC Power Supply and PT/CT Wiring

4-2

Chapter 4 Terminal Board I/O and Equipment Connections GEH-6632 EX2100 User’s Guide

••••

A redundant PT input for PT failure detection is possible, and single-phase sensing can be supported.

Power Potential Transformer Inputs

In the EX2100 excitation system, a 3-phase source of ac power is converted to a controlled dc output. This ac input can be from one of several sources. Most common is a generator terminal connected Y-Delta power potential transformer. The primary and secondary voltages as well as kVA ratings are sized for the particular application. An auxiliary bus fed PPT is also commonly used. In industrial applications where forcing is needed for large motor starting a compound source (current and voltage) input can be used. This ac input is connected to the bus in the bridge cabinet and can be isolated by the 41AC1 device for maintenance. It is monitored by the controls through the EACF board.

Potential and Current Transformer Inputs

Customer supplied 3-phase PT and CT are wired to switches in the control cabinet as shown in Figure 4-1. The switches are wired to the EPCT. High frequency noise suppression near the point of signal entry is provided on all input signals to EPCT. On the board, the two 3-phase generator voltage inputs, nominal 115 V ac, are brought into PT transformers. Two generator CTs (phases A and C), with either 1 A or 5 A secondaries, are brought into CT transformers. The resulting low voltage transformer output signals are cabled to the EMIO board in the control rack.

Generator Voltage Measurement

The cable lengths from the generator PTs can be up to 1000 ft of #12 AWG wire. The PT secondary outputs are nominally 115 V rms at 50/60 Hz and are fused. On EPCT, the two transformers make a three-wire open delta voltage measurement, yielding 1.533 V rms for a 115 V rms input.

In the case of a simplex system the voltage signals are sent through the J305 connector to the EMIO board in the M1 controller. In the case of a redundant system, the signals are fanned to connectors J305, J308, and J315, and sent to controllers M1, M2, and C.

Item PT Inputs CT Inputs

Number of Inputs 2, 3 phases each 2, Phases A and C

Volts or Current 10-200 V rms, 115 V rms nominal 0-2 A, nominal 1A, or

0-10 A, nominal 5 A

Frequency 50/60 Hz nominal 50/60 Hz nominal

Burden Less than 1 VA Circuit loading 6.25 VA nominal

Generator Current Measurement

Two generator current inputs from the CTs are wired to non-pluggable terminal blocks, TB2 and TB3 that support ring terminals. The CTs do not have fused secondaries. There is a choice of a 0-1 A rms CT input, or a 0-5 A rms CT input. The cable length from the CT to the EPCT board can be up to 1000 ft., and the wire gage can be up to #10 AWG. The resulting signals are sent to the EMIO board through the same connectors as the voltage signals.

Analog Input

The EPCT board provides an analog input for customer use. This input is jumper selectable for either ± 10 V dc or 4-20 mA. The EMIO samples the input at 2000 samples per second, and the accuracy is better than 1% full scale.

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections

4-3

••••

Customer Contact I/O

Customer contact inputs and relay contact outputs are wired to the ECTB board.

In addition to six general purpose contact inputs, there are two dedicated contact inputs, wetted by 70 V dc from the exciter, as follows:

• 86G contact input used as a lockout during normal operation

• 52G contact input gives the online status of the generator

ECTB provides four general purpose Form C contact outputs controlled by EMIO. These are used for 94EX and 30EX and other outputs. For each relay, the coil current and the status of a relay auxiliary contact is monitored. These feedbacks are cabled to EMIO in the controller. Refer to Figure 4-2 and Table 4-1.

Table 4-1. General Purpose Relay Contact Characteristics:

Item Description

Customer Power 125 V dc nominal (24 V dc min)

Relay break characteristic

Suppression External suppression supplied by customer on induction loads

Resistive load 2 A 28 V dc

0.5 A 125 V dc

Inductive 1 A 28 V dc 0.007 s (L/R)

0.1 A 125 V dc 0.007 s (L/R)

ECTBG1 is the redundant control version of the ECTB. This fans inputs to three connectors J405, J408, and J418 that are cabled to the three controllers. For relay control, the board does two-out-of three voting, and the 70 V dc and 24 V dc inputs are redundant.

4-4

Chapter 4 Terminal Board I/O and Equipment Connections GEH-6632 EX2100 User’s Guide

••••

From M1

J13M1

P70 V dc

ECTBG2 (Simplex)

TB1

From M1 (EMIO)

J405

P24M1

P24D

Relay Driver

Four General Purpose Relay Outputs as Above

Relay Driver

Two Trip Relay Outputs as Above

Coil

K#GP

Coil

K#M1

P24M1

COM

Customer Power to Contacts

125 V dc

Ex. Fault to Mark VI

Customer Power to Contacts

125 V dc

Term. 1&5 Ex. trip to Customer 86

Red LED

To Optocoupler on M1 (EMIO)

Figure 4-2. Customer I/O wired to ECTBG2 Simplex Board

Six Circuits as Above

Current Limit

Circuit

Current Limit

Circuit

P70Vdc

TB2

Auxiliary Contact Input

52G Contact

(Closed

online)

86G Contact

(Open for Trip)

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections

4-5

••••

Power Supply Inputs

The customer’s ac and dc power inputs are wired to the exciter’s Power Distribution Module (EPDM), which is located on the left hand side of the exciter power backplane rack. Figure 4-3 shows the screw terminals for the 125 V dc battery source, and the 115 V ac suply, AC1. A second ac supply, AC2, can also be connected.

EPDM Exciter Power Distribution Module

125 V dc from battery

115 V ac supply #1

115 V ac supply #2

N125Vdc N125Vdc N125Vdc

AC2N AC2N

12 10

SPARE

SW7

SW6

SW5

SW4

SW3

TB1

3 5 7

9 11 13 15 17 19 21 23

P125Vdc P125Vdc P125Vdc

AC1H AC1H AC1N AC1N AC2H AC2H

SW2

SW1

J1C

J1M2

J1M1

J8C

J8B

J8A

JDACA1

3 1

JDACA2

Figure 4-3. Power Wiring Connections to EPDM.

4-6

Chapter 4 Terminal Board I/O and Equipment Connections GEH-6632 EX2100 User’s Guide

••••

Line Filter Connections

The 600 V filter is connected to fuse board LFU1. The 1000 V filter has two filter circuits and is connected to fuse boards LFU1 and LFU2. The filters are located at the top of the auxiliary cabinet. Connections to the line filter are shown in Figure 4-

From PPT

L1 L2 L3

DISC 1

LFU2

B-L1

B-L2

B-L3

135

F U3

LFU1

Auxiliary Enclosure

Linefilter

FU1F

135

GND

GND on

Aux Panel

Figure 4-4. AC Feedback and Line Filters

TB4

Coil1_H

Coil1_L

Coil2_H

Coil2_L

TB1

TB2

TB3

480V : 1.6V

EACF1

Control

Enclosure

EKBP

Rack

J5 04

J5 09

J5 14

EMIO M1

EMIO M2

EMIO

To Warm

Backup Bridge B2

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections

4-7

••••

Exciter Internal I/O

Exciter AC Feedback

The EACF board measures the exciter ac supply voltage and current. The terminal board contains transformers for a 3-phase voltage measurement, and terminals for two flux/air core coils. The cable between EACF and the EBKP control backplane can be up to 90 m in length. Cable shield terminal screws attached to chassis ground are located within three inches of the input screws where applicable. There are two versions of the circuit board, EACFG1 for up to 480 V rms inputs, and EACFG2 for up to 1000 V rms inputs. Refer to Figure 4-4.

Exciter DC Feedback

The EDCF board measures field current and field voltage at the SCR bridge, and interfaces to the EISB board in the controller over a high-speed fiber-optic link. The fiber optics provides voltage isolation between the two boards, and high noise immunity. For a circuit block diagram, refer to Figure 4-5. The field voltage feedback circuit provides seven selector settings to scale down the bridge voltages appropriate to the application.

+24V

-24V

+/-24Vdc from External Source

To EISB board

J16

Inverter

COM

30 Vdc max.

Fiber Optic Link

DC/AC

Tx1

Tx2

V feedbk

Voltage Isolation Barrier

EDCF DC Feedback Board

AC/DC Converter & Power Supplies

I feedbk

Field Current

Amplifier

Field Voltage

Amplifier

+ 24 V dc

- 24 V dc

+ 15 V dc

- 15 V dc

+ 5 V dc

Shunt

input

scale 7

JP7

R 9

ACOMH

scale 1

JP1

Stab-on

SCR Bridge

Shunt

Field

ACOMH

Figure 4-5. Field Voltage and Current Measurement

4-8

Chapter 4 Terminal Board I/O and Equipment Connections GEH-6632 EX2100 User’s Guide

••••

Field Current Feedback

The field current is measured across a dc shunt at the SCR bridge. This generates a nominal 100 mV signal, which is input to a differential amplifier. The output voltage from the amplifier ranges from –5 V to +5 V. A VCO produces a linear proportional frequency of 0 to 2 MHz with an accuracy of 1% of full scale reading. These pulses drive the LED in the optical isolator coupled to the fiber-optic cable.

Field Voltage Feedback

The bridge voltage is measured across the negative terminal of the bridge and the positive terminal of the current shunt. After scaling the voltage with the jumpered resistors, the signals are input into a differential amplifier which controls the voltagecontrolled oscillator (VCO). The VCO produces a linear proportional frequency of 0 to 2 MHz with an accuracy of 1% of full-scale reading. The pulses drive the LED in the optical isolator coupled to the fiber-optic cable.

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections

4-9

••••

Control Cabinet

EISB M1

Volts

Current

Generator

Field

Duplex Fiber-

Optic Link

PSM1

Auxiliary Cabinet

EDCF-1

VFOF

CFOF

P24VDC

VCO

Voltage

VCO

Current

PPT

Scaling

Shunt (mv)

+ -

Dc Shunt

L1 L2 L3

Control Cabinet

Control Rack

J505

EMIO

J508

EMIO

J515

EMIO

SCR1

SCR4

EXTB

P125

P70V

J505

J508

J515

K41_M1

K41_M2

K41_C

Feedback

SCR2

SCR5

J2 J5

K41_M2

K41_C

K41_M1

N125

70V Return

SCR3

J2/3M

SCR6

To Bridge 2

FILT1

41A

41B

41A

To Bridge 2

41B

Generator

+ -

BK WH

Field +

Auxiliary Cabinet

HS +

De-Excit.

FDI-1

53B (W)

Field

Flash

53B (Y)

TB1-1

Shaft

Voltage

TB1-2

Generator Field -

Figure 4-6. DC Field Circuit Contactor and Control Board

4-10

Chapter 4 Terminal Board I/O and Equipment Connections GEH-6632 EX2100 User’s Guide

••••

De-Excitation

During shutdown of the generator, the stored energy of the generator field inductance must be dissipated. In the EX2100 exciter, this is the function of the EDEX de-excitation module and field discharge resistor or inductor (when supplied).

Standard de-excitation is provided by a freewheeling diode. For higher performance applications, the de-excitation module consists of a thyristor (53 mm or 77 mm cell size) mounted in a large heatsink assembly with attached snubber network.

The EDEX board contains Hall effect conduction sensors. The sensors are mounted in the air gap of a circular steel core attached to the board. They sense the magnetic field produced by the field discharge current flowing through the thyristor. Two independent sensor circuits are used. The EDEX fires the SCR when either of two control inputs is true or when the anode to cathode voltage of the SCR exceeds a certain value. The two firing control circuits on the board are powered from separate power supplies and use separate conduction sensors making them mutually independent.

The actual control logic inputs used are dependent on the application. When the exciter shuts down, a P24 V firing control signal is sent to both de-excitation module firing control circuits. Both firing control circuits send gate pulses to fire the deexcitation SCR. At this point, the main field polarity reversal has occurred making the SCR anode positive with respect to the cathode. Therefore the SCR conducts and dissipates the stored energy of the generator field through the field discharge device.

Feedback from either conduction sensor verifies that the discharge circuit has operated successfully. If both independent firing control circuits fail to fire, the SCR is fired by the anode firing circuit when the anode to cathode voltage has exceeded the selected level.

For large exciters, it is possible to connect multiple de-excitation modules together with one EDEX board configured to be the Master and the other boards configured to be Slaves. In this case, a firing control signal sent to the Master is relayed to the Slave modules, firing all modules simultaneously.

EXTB controls the main breaker or contactor in the field circuit. When this opens, the auxiliary contacts cause an immediate de-excitation commanded by EDEX. Deexcitation controlled by EXTB in both the contactor and breaker mode is shown in Figures 4-7, and 4-8.

Location of the 41A dc contactor in the field circuit is shown in Figure 4-6. Contactor 41B is optional. Both contactors are located in the Power Conversion Cabinet, and are driven from the 41 Close pilot on the EXTB board. Several auxiliary contacts are used to provide status feedback to the control, and firing commands to the de-excitation board, EDEX.

An alternative to an 41A and 41B contactor is to use a breaker in the excitation ac supply or dc field circuit. Normally, the breaker would be a dc field breaker that ccould break the output while inserting a discharge resistor with the normally open contact. But, an ac break with the SCR based de-excitation module could also be applied. The breaker has two coils, 41 Close and 41 Trip, and auxiliary contacts for de-excitation. Figure 4-8 shows how the breaker interfaces with the EXTB control board and EDEX.

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections

4-11

••••

Auxiliary Cabinet

Control Cabinet

Converter Cabinet

Generator Field +

HS+

DEPL

P24

COM

N24

To EPBP

J17M1

De-Excitation

Conduction Sense Circuit

M1 De-Excit.

Status

M2 De-Excit.

Status

Self Firing

M2 Firing

Command

M1 Firing

Command

P24

COM

N24

To EPBP

N24

J17M2

HS-

Generator Field -

FDI

EDEX

P24V

EXTB G1 -

(Simplex version is G2)

Contactor Mode

J505

To M1

J508

To M2

J515

To C

787

4 3

Status

Feedback

Status

P70V

70V Ret

Bkr

41 Trip Relays not present on G1 and G2 boards

M1 M2

41 Close

P125

M2 C

CM1

Bkr.

N125

Ct.

ABA

41A 41B

KDEP

N125

P70Vdc

N125

P125

P70VM1

P70VM2

J12M2

J12M1

Figure 4-7. DC Contactor Control and Wiring to De-Excitation Board

4-12

Chapter 4 Terminal Board I/O and Equipment Connections GEH-6632 EX2100 User’s Guide

••••

Auxiliary Cabinet

Generator

De-Excitation

Field +

HS+

DEPL

Conduction

Sense Circuit

M1 De-

Exc Status

M2 De-

Exc Status

Self Firing

M2 Firing

Command

M1 Firing

Command

HS-

N24V

Generator Field -

FDI

EDEX

P24V

Control Cabinet

EXTB G3 -

(Simplex version is G4)

Breaker Mode

J505

J508

To M1

To M2

Customer

Breaker

J515

To C

CTB

Status

Feedback

Status

P70V

70V Ret

Bkr

P24

COM

N24

To EPBP

J17M1

P24

COM

N24

To EPBP

J17M2

N24V

41 Trip

P125

41 Close

P125

KDEP

N125

M2 C

CM1

M2 C

CM1

N125

P70VM2

Bkr

N125

P70Vdc

J12M1J12M2

P70VM1

Breaker

Trip

Figure 4-8. Ac or Dc Breaker Control and Wiring to De-Excitation Board

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections

4-13

••••

Crowbar

The optional crowbar subsystem limits high negative voltages that can be induced into the PCM during a pole slip (loss of synchronization) event. Like the deexcitation module, the crowbar will self-fire based on selective field voltage limits. It includes a discharge resistor, which may be shared with the de-excitation function when the two are supplied together. This is typically only provided on generators with salient poles (hydro applications).

Field Ground Detector

The EGDM is an active system that applies a voltage to the field circuit.

The generator field is an ungrounded system. The field ground detector (EGDM) detects field leakage resistance between any point in the field circuit of the generator and ground. The active detection system shown in Figure 4-9 applies a low frequency square wave voltage with respect to ground, and monitors for current flow through a high impedance ground resistor. The square wave is ±50 V dc at 0.2 Hz frequency. If PRV resistors are present, grounds anywhere in the system can be detected even while the exciter is not being fired, from the PPT secondary to any point in the generator field.

The ground detector feedback voltage is sent over a fiber-optic link to the DSPX where it is monitored and alarmed. The DSPX controls the oscillator voltage over an adjacent fiber-optic link. In the case of redundant control, if the M1 controller fails, the oscillator in the M2 channel takes over, as commanded by controller C.

One or three EGDMs are mounted next to the power supplies in the power backplane.

4-14

Chapter 4 Terminal Board I/O and Equipment Connections GEH-6632 EX2100 User’s Guide

••••

Generator Field +

Auxiliary Cabinet

From Flashing 53B

Control Cabinet

Generator Field -

Ground Detector Attenuator

Module EXAM

Ground Detector Voltage

+/-65 Vdc +5V +/-15V

Backplane

EGDM - M1

VCO

Oscillator 1

VCO

Oscillator 2

VCO

Control

Power

EPBP

Control

Backplane

EBKP

EISB - M1

Optical

Receiver

Transmitter

Receiver

Transmitter

Receiver

Transmitter

Optical

To DSPX Counters

Oscillator control

To DSPX Counters

Oscillator control

To DSPX Counters

Master Select

Power Supply

P24 V

Figure 4-9. Field Ground Detector

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections

4-15

••••

Field Flashing

The station battery is used to initiate the field current. An auxiliary ac source can also be used.

Flashing current flow is monitored by the control through the field shunt.

Field flashing relays 53A and 53B are controlled from drivers on the EMIO board, through pilot relays on EXTB. In redundant control, the three driver signals actuate pilot relays on EXTB that are contact voted to output a single voltage. These outputs actuate the 53A and 53B relays in the Auxiliary Cabinet. The 53A and 53B contacts put dc voltage from the station battery across the generator field, as shown in Figure 4-10. The field flashing module supplies approximately 15 to 20% of AFNL to the generator field during the startup sequence.

For ac field flashing, the ac voltage is rectified by a diode bridge and filtered. The startup sequences and logic are the same.

Dc Field Flashing Settings

Field flashing panels are used to supply a wide range of flashing currents. This happens if the flashing control fails, leaving the flashing current on continuously. The flashing current magnitude required for a generator is set by configuring a maximum and minimum allowable value in the control module.

The current values are preset in the factory based on information supplied. These values define the envelope in which the hysteretic flashing control holds the field current during the flashing sequence.

Flashing Control Sequence

A start request is issued by the operator. The optional field contactor(s) closes, followed by contactor 53B, then 53A. When the field current reaches the maximum allowable field flash value (typically 15 - 20% of AFNL), contactor 53A opens and the field current decays through the freewheeling diodes. If the control has not taken over before the current decays to the minimum field flash current setting, typically 10% AFNL, the sequence is repeated. If the current magnitude exceeds approximately 25% AFNL, or the control has not taken over after a fixed time delay, the startup is stopped and a diagnostic alarm is issued.

4-16

Chapter 4 Terminal Board I/O and Equipment Connections GEH-6632 EX2100 User’s Guide

••••

From Shunt1 +

Auxiliary Panel

Station Battery

125 Vdc

Generator

Field -

Flashing

53B

w v

53A

1 2

FU2

53B

FBK1

FU1

PTB-1

53B

SUP

53A Aux

53B Aux

53A

Shaft Voltage

Suppresser

EXAM

TB1

132

EXTB

P70Vdc

CM2

M1 53B M2 53B

C 53B

J5M1

J5M2

J5C

M1-EMIO

(J5)

M2-EMIO

(J5)

C-EMIO

(J5)

Current

Limit

Circuit

K53B relay

contacts

K53A relay

contacts

Current

Limit

Circuit

M1 53A

M2 53A

C 53A

P70Vdc

P70VM1

P70VM2

P70VDC

Figure 4-10. Field Flashing Control from EMIO and EXTB

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections

4-17

••••

Shaft Voltage Suppressor

Excitation systems, which produce a dc voltage from an ac supply through a solid state rectification process, cause ripple and spike voltages at the exciter output. Due to their rapid rise and decay times these voltages are capacitively coupled from the field winding to the rotor body. This creates a voltage on the shaft relative to ground that, if not effectively controlled, can damage both journals and bearings. The shaft voltage suppressor is a filter that conducts the high frequency components of the induced voltages to ground and limits shaft voltage caused by thyristor commutation to less than 7 V zero to peak. For the connections to the field, refer to Figure 4-11.

Generator Field +

Shaft Voltage Suppressor

TB1-1

Thyrite

Field Flashing

TH1 TH2

R5 R6

TB1-3

J1-1

J1-2

53B

AUX

Generator Field -

TB1-2

R3 R4

Crowbar

HSA

Heatsink

JCY JCX DEPL

EPL1

EPL2

Figure 4-11 Shaft Voltage Suppressor, Thyrite, and Crowbar

4-18

Chapter 4 Terminal Board I/O and Equipment Connections GEH-6632 EX2100 User’s Guide

CBRO

HSC

••••

Data Highway Connections

The Data Highway integrates several different single control systems.

Central Control Room

From other Units From other Units

The EX2100 exciter communicates over the same data highway as the Mark VI turbine control and the HMI. A typical exciter connection to the redundant Unit Data Highway (UDH) network is shown in Figure 4-12. This shows redundant control with two ACLAs. The UDH is implemented using commercially available fast Ethernet switches.

10Base-T cabling is used for short distances between the controller and the T-switch, and any local HMI. The 10BaseT ports in the ACLA and the T-switch are for RJ-45 connectors. The maximum distance for local traffic at 10 Mbps using unshielded twisted pair cable is 100 m.

100Base-FX fiber optics can be used for longer distance communication between the local controllers and the central control room. The 100BaseFX ports in the T-switch and the Ethernet switch are for SC type fiber-optic connectors. The maximum distance at 100 Mbps using 100BaseFX fiber-optic cables is 2 km. Redundancy can be obtained by using two T-switches with an interconnecting cable.

Fast Ethernet Switch A

Fast

Ethernet

Switch B

100Base-FX connections

To local HMI Viewer, 10Base-T

Local Control Area

T-Switch BT-Switch A

From other Controllers From other Controllers

ACLA

H1A

Industrial Systems

S T A T U S

COM

ENET

Exciter Control

Cabinet

Figure 4-12. Unit Data Highway Connections

Ethernet Port, RJ-45

10Base-T connections

Industri al

Systems

S T A T U S

COM

ENET

ACLA

H1A

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections

4-19

••••

Control System Toolbox Connection

The toolbox connector on the exciter backplane supports an RS-232C cable, which connects an external computer to the DSPX board. This connection is for maintenance purposes. There are three 9-pin connectors located at J303B, J310B, and J313B to support communication with controllers M1, M2, and C. (Refer to Figure 4-13).

The UDH can also provide a toolbox interface using the Ethernet port on the ACLA. This is a 10BaseT port and uses an RJ-45 connector for unshielded twisted pair cable.

UDH Ethernet Data Highway to Toolbox and HMI

Toolbox RS-232C Computer Cable Connections

DSPX

EISB EISB

Key Pad

Tool M1 Tool M2

Test Rings M1 Test Rings M2 Test Rings C

EMIO ESEL ESEL EMIO

J304 J305 J306 J307 J308 J309

J405J404 J406 J407 J408 J409

DSPX ACLAACLA

Key Pad

DSPX

Key Pad

Tool C

EMIOEISB

J315J314

E P C

J414 J415

E C

Power

J509J508J507J506J505J504

E A C

J602 J610 J612

E X T B

E A C F

Power

Powr

IS200EBKP

J515J514

C F

Figure 4-13. Toolbox Connections

4-20

Chapter 4 Terminal Board I/O and Equipment Connections GEH-6632 EX2100 User’s Guide

••••

Chapter 5 Diagnostic Interface-Keypad

Introduction

This chapter provides operating guidelines for the Diagnostic Interface, more commonly called the keypad. The keypad is a door-mounted, local control unit that enables you to:

• Monitor frequency, current, power, and voltage

• Start and stop the exciter

• Set and adjust configuration parameters

• Examine and reset fault conditions

This chapter is organized as follows:

Section Page

Using the Pushbuttons.............................................................................................. 5-2

Reading the Display................................................................................................. 5-5

Changing Display Units.................................................................................... 5-7

Adjusting Display Contrast............................................................................... 5-7

Status Screen............................................................................................................ 5-8

Reading the Meters........................................................................................... 5-8

Alternate Status Screen (Display I/O)...................................................................... 5-8

Using the Menus ...................................................................................................... 5-9

Viewing and Resetting Faults .................................................................................. 5-9

Editing Parameters................................................................................................. 5-10

Parameter Backup........................................................................................... 5-11

Firmware and Hardware Information..................................................................... 5-13

Protecting the Keypad............................................................................................ 5-14

Modifying the Protections .............................................................................. 5-14

EX2100 User’s Guide GEH-6632 Chapter 5 Diagnostic Interface-Keypad

5-1

••••

Using the Pushbuttons

The keypad includes membrane-type pushbuttons to access exciter values and to control the exciter. Tables 5-1 and 5-2 define the pushbutton functions for menu navigation and exciter control (see Figure 5-1).

EX2100 Excitation Control

FVR Feedback

FldCurrAmps

Vmag

Freq_Hz

60.00

Navigation

Status

0.0 Volts

0.00 Amps

0% 150%

-30%

0% 150%

-30%

Imag

0.000.00

Balance Meter Vars

0.00

Watts

0.00

Exciter Control

Reset

Faults

Command

Voltage Level

EnterEscape

Auto

Man

100%

Exciter Health

& State Icons

Run (Green)

Stop (Red)

Off

Display:

screens provide analog and digital

Status

representation of exciter functions and values.

screens provide text-based access to

parameters, wizards, and faults.

Pushbuttons:

Organized into functional groups:

Navigation Exciter Control Run

buttons for using the menu

buttons

and

Stop

buttons

Figure 5-1. Diagnostic Interface - Keypad

5-2

Chapter 5 Diagnostic Interface-Keypad GEH-6632 EX2100 User’s Guide

••••

Button Function

Table 5-1. Navigation Pushbuttons

Status

Escape

Enter

Displays the default Status Screen, which shows eight parameters as numbers or bargraphs. A set of Health icons (displayed at all times; see Exciter Health and State Icons) provides additional exciter status information.

If pressed while displaying a Menu screen (see Menu Selections), displays the Main Menu.If pressed while displaying a Status screen, displays the last Menu screen. If held down, the up and down arrow keys adjust screen contrast

Menu Navigation: Used to highlight (reverse image) an item in a menu of options.

Adjust Contrast, if menu key is held down. Entry of Numeric Parameter: Used to index through numbers (0-9, ., -) when editing a parameter.

Entry of Option Parameter: Used to index through 1 – n choices.

(See Parameter Configuration.)

Menu Navigation: Right Arrow button displays the next selected level down in a menu tree. Left Arrow button displays next level up in menu tree.

Entry of Numeric Parameter: Used to select a digit when editing a parameter.

Entry of Option Parameter or Command Execution: Not functional.

Menu Navigation: Displays the next level up in menu tree.

Entry of Parameter: Displays the parameter list.

Menu Navigation: Displays the next level down in menu tree.

Entry of Parameter: Accepts editing of parameter.

EX2100 User’s Guide GEH-6632 Chapter 5 Diagnostic Interface-Keypad

5-3

••••

Table 5-2. Exciter Control Pushbuttons

Button Function

Reset Faults

Command

Auto

Man

Resets faults.

Quick access to a list of commonly used commands

Selects Auto mode (AC regulator or AVR)

Selects Manual mode (DC regulator or FVR)

Increase voltage, VARS, PF

Decrease voltage, VARS, PF

Run

Stop

5-4

Chapter 5 Diagnostic Interface-Keypad GEH-6632 EX2100 User’s Guide

••••

Reading the Display

The keypad displays information as both text and animated graphics. There are two types of content screens, selected by pressing the corresponding Navigation button: Status and Menu.

The Status Screen (Figure 5-2) is the default screen that displays after exciter startup, following an initialization screen. It uses animated meters with associated text to present exciter performance data. An alternate Status Screen can also be accessed (see Status Screen).

Text Identifying Exciter Variable

FVR Feedback

FldCurrAmps

Vmag

Freq_Hz

60.00

0.0 Volts

0.00 Amps

Animated

Heartbeat

Meters

Fault State

0% 150%

-30%

0% 150%

-30%

Imag

0.000.00

Balance Meter Vars

0.00

Watts

0.00

100%

Limiter

Auto Mode

Running

Online

Figure 5-2. Status Screen Example

The Menu Screen (see Figure 5-3) lists and provides access to menu-based functions for adjusting parameters, running wizards, and viewing faults (see Menu Selections).

Main Menu

Fault List Alarms Alarm String

Application data Diagnostic and utility functions General setup I/O interface

Figure 5-3. Menu Screen Example

The Exciter Health and State Icons continually show on the right hand side of all display screens. They indicate if the exciter is functioning correctly and show its running state. These icons are displayed in five functional groups, as shown below. You can change the display units and adjust the display contrast, if needed.

EX2100 User’s Guide GEH-6632 Chapter 5 Diagnostic Interface-Keypad

5-5

••••

Table 5-3. Exciter Health and State Icons

Group Icon Indication Description

CommunicationsOKAnimated line (its center raises and lowers) shows that there is

Heartbeat

Communications not established

Auto mode Regulates terminal voltage.

Manual mode Regulates field voltage.Control

Test Mode The exciter is performing a diagnostic test.

Blank Exciter OK When no icon displays, the exciter is operating correctly.

Abnormal Displayed when there are over-ridden parameters.

communication between the keypad and the exciter.

Animated metronome icon shows that the keypad is attempting to establish communication with the exciter, but cannot.

Fault State

Status

blinking

Alarm state Displayed when an alarm condition occurs.

Trip fault Displayed when a fault state occurs.

Stopped Exciter is stopped.

Running Exciter is running.

Limiting

Offline Exciter is offline.

Online Exciter is online.

Field voltage regulator output is greater than field current regulator or V/Hz or UEL limits are active.

5-6

Chapter 5 Diagnostic Interface-Keypad GEH-6632 EX2100 User’s Guide

••••

Changing Display Units

Ø To change the type of measurement units displayed

1. From the Main Menu, select General Setup.

2. Select Display Units.

3. Select the display units parameter to edit it (see below).

4. Highlight, then select the preferred display units.

Press ENTER to accept, ESC to leave

Display units New Value = Metric (SI) Present Value = Metric (SI)

Adjusting Display Contrast

Shortcut – Press and hold the

Menu key. Press the Up and Down arrows to adjust the

display contrast.

ØØØØ To adjust the display contrast

1. From the Main Menu, select General Setup.

2. Then select:

a. Keypad

b. Keypad Functions

c. Adjust Screen Contrast

This displays the following screen.

- CONTRAST ADJUSTMENT -

HOLD UP ARROW TO INCREASE HOLD DOWN ARROW TO DECREASE

Press ESCAPE to Continue

3. Press the Escape button to save the contrast value and return to the previous

menu.

EX2100 User’s Guide GEH-6632 Chapter 5 Diagnostic Interface-Keypad

5-7

••••

Status Screen

The Status screen displays up to eight variables (parameters). The first two parameters are displayed both in text and animated meters. Table 5-4 defines the characteristics of the bar graphs for these parameters.

Reading the Meters

A variable shown as a bar graph is over range when it is either greater than + 100% or less than –100%. The over range mark is shown with a vertical bar through the bar graph at the +100% and the –100% marks.

Not Over Range

-100%

Table 5-4. Animated Meter Characteristics (Default) for Status Screen

Bar Graph

Variable

DC bus voltage Magnitude of dc bus voltage (FVR feedback) Percentage of dc per unit volts (VDC_PU)

AC line current Magnitude of ac line current (I_Mag_Fil) Percentage of source top-rated current (I_PU)

Numeric Display Units in Bar Graph

+100%

Over Range

Alternate Status Screen (Display I/O)

The keypad has an alternate Status screen that displays the status of the general purpose inputs and outputs. To toggle between the Meter Status Screen and the I/O Status Screen, press any of the Arrow buttons.

The circle under each heading indicates the status of the corresponding I/O point, as follows:

•

l = True

• ¡ = False

Display I/O Status

123456

GP Inputs GP Outputs

5-8

Chapter 5 Diagnostic Interface-Keypad GEH-6632 EX2100 User’s Guide

••••

Using the Menus

The keypad’s Main Menu leads to other menu screens, where data can be reviewed and modified. The Main Menu can be accessed from any screen, as follows:

• If already in a Menu screen, press the Menu button.

• If in a Status screen, press the Menu button once or twice.

Main Menu

Fault List Alarms

Alarm String

Application data Diagnostic and utility

General setup

I/O interface

Note The Main Menu selections may vary from product to product.

Use the Navigation buttons to move through the menus, select items, and adjust values

• Press the Up or Down Arrow buttons to move through and highlight menu

items.

• Press the Enter button to select a highlighted item

• To return to a previous menu screen, press the Escape button, Left Arrow

button, or follow on-screen instructions.

• When a menu has more than one screen:

– Move to the next screen by highlighting the last item on the displayed

screen, then press the Down Arrow button once more.

– If the last menu item is reached, then pressing the Down Arrow button will

wrap back to the first item on that menu.

Viewing and Resetting Faults

When the display indicates either a Trip or an Alarm fault (refer to Reading the Display), you can view information and reset (clear) current faults, as follows:

1. From the Main Menu, select Fault List, then select Display Active Faults.

The following screen displays.

Faults are displayed in order of occurrence with the most recent fault at the top.

86 Trip DC Over-current Trip

115 Trip Bridge 1 Fan 1 BAD

58 Brief Low AC V 95 Field temp alarm

ACTIVE FAULT DISPLAY

--- RESET FAULTS NOW ---

Refer to GEH-6633 Troubleshooting, Preventive and Online Maintenance, for a list of faults.

EX2100 User’s Guide GEH-6632 Chapter 5 Diagnostic Interface-Keypad

5-9

••••

2. To view detail on a particular fault, select that fault (listed on the Active Fault

Display screen). The following screen displays.

SELECTED FAULT - PRESS

Low AC V, B

006:40:11.008 Low AC input volts detected on the field exciter.

3. Reset the faults either of two ways:

- Select Reset Faults Now in the Fault Display screen.

- Press the Reset Faults button.

Ø To view the exciter’s Fault History (a list of previously cleared faults

and fault resets)

This display list may be

• From the Main Menu, select Fault List, then select Display Fault History.

multiple screens long.

86 Trip DC Over-current trip. 115 Trip Bridge 1 Fan 1 BAD

58 Brief Low AC V

95 Field temp alarm

Editing Parameters

There are two types of parameters that can be changed using the keypad:

• Option parameters lists items (options) for you to select. For example,

• Numeric parameters lists valid digits that you select to create a number.

Ø To edit a parameter

1. From an exciter Parameters screen, select the parameter that is to be changed.

Parameters

GPT_Vrms = <No Value> VHiTripLev = 1.2 AFFL = 100

TripVHiTrip =

VFFL = 100

100.0

FAULT HISTORY DISPLAY

0 Cleared Fault reset

--- RESET FAULTS NOW ---

True/False is an option parameter.

Trip enabled

This displays either an Option or Numeric parameter screen (see both below) with the New Value line highlighted.

5-10

Chapter 5 Diagnostic Interface-Keypad GEH-6632 EX2100 User’s Guide

••••

2. For an Option parameter:

a. Use the Up or Down Arrow buttons to select a new parameter value.

b. Press the Enter button to accept the change or Escape to exit and keep the

present value.

Press ENTER to accept, ESC to leave

TripVHiTrip New Value = Trip disabled Present Value = Trip enabled

3. For a Numeric parameter:

a. Use the Left or Right Arrow buttons to highlight the digit to be changed.

If you continue pressing the Left Arrow button after reaching the left-most digit of the edit field, the field fills with blanks. Pressing Enter when the entire number is blanked out saves a <No Value>.

b. Use the Up and Down Arrow buttons to index through the valid digits (0, 1,

2, 3, 4, 5, 6, 7, 8, 9, e, ., -).

The e in the digit selection represents the start of the exponent in scientific notation. If the e is used, all digits to the right of the e make up the number’s exponent.

Each new backup overwrites the previous backup copy, which cannot be restored.

Press ENTER to accept, ESC to leave

VHiTripLev New Value = 1.3 Present Value = 1.2 Low Limit = 0.0000000 High Limit = 3.4028239e38

4. When all of the digits have been changed, press Enter to accept the new value or press Escape to exit and keep the present value.

Parameter Backup

It is good practice to keep a backup copy of the exciter’s working parameter configuration. You can then restore this file, if needed, or compare it with a reconfigured file to determine differences.

Ø To save active parameters

1. From the Main Menu, select Parameter Backup Functions then select Save Parameters to Backup.

Save Parameters to Backup

Save current parameter values.

Press ENTER to continue. ESC cancels.

EX2100 User’s Guide GEH-6632 Chapter 5 Diagnostic Interface-Keypad

5-11

••••

2. Press Enter to make a backup copy of the parameters or Escape to cancel.

Ø To restore a parameter from backup

1. Stop the exciter. (This function cannot be executed with the exciter running.)

2. From the Main Menu, select Parameter Backup Functions then select Restore

Parameters from Backup.

Press to restore Parameters from Backup

-- WARNING -The active parameter values will be replaced, and can not be recovered.

Press ENTER to continue. ESC cancels.

3. Press Enter to restore the backup parameters or Escape to cancel.

Restoring parameters from a backup file overwrites the currently active parameter values, which cannot then be restored.

Ø To compare the active parameter set to the backup parameter set

1. From the Main Menu, select Parameter Backup Functions then select

Compare Current Parameters to Backup.

BACKUP DIFFERENCES <More↑>

VHiTripLev = 1.3

Backup value = 1.2

AFFL = 112.0

Backup value = 100.0

VFFL = 110.0

Backup value = 100.0

<More↓>

2. Use the Up and Down Arrow buttons to scroll through the list of backup

differences.

3. Press Escape to return to the previous menu.

5-12

Chapter 5 Diagnostic Interface-Keypad GEH-6632 EX2100 User’s Guide

••••

Firmware and Hardware Information

Ø To view the firmware versions for the DSPX board and the keypad

From the Main Menu select:

1. General Setup

2. Firmware Version & Hardware Info

3. Display Firmware Version

The following screen displays:

GE Generator Control

EX2100 DSPX Firmware Version: V02.06.00B DSPX Boot Monitor Version: V02.02.00C DDI Firmware Version: V02.00.00B

Press ESC to exit

Ø To view exciter hardware information

From the Main Menu select:

1. General Setup

2. Firmware Version & Hardware Info

3. Display Hardware Information

The following screen displays:

GE Generator Control

Hardware Information:

IS200ESELH1APR 5473716 IS215ACLAH1AL 8790070 IS200DSPXH1CAA 7611193 IS200EMIOH1APR 7360814 IS200EISBH1APR 5673766 <More ↓>

ESC to exit

EX2100 User’s Guide GEH-6632 Chapter 5 Diagnostic Interface-Keypad

5-13

••••

Protecting the Keypad

To protect the exciter from unauthorized operation or reconfiguration, the keypad includes two security controls, Password and Privilege Level.

The Password is a 5-digit number that protects the Password and Privilege Level from being changed by unauthorized personnel. The default Password is 00000.

Privilege Level specifies which operational and configuration functions are disabled in the keypad. There are three levels:

• Read Only disables both the Exciter Control and the Configuration functions.

An operator can view but not edit parameters.

• Operate & Read Only enables the Exciter Control function, but disables

Configuration functions. An operator can view, but not edit parameters.

• Configure & Operate enables both the Exciter Control and the Configuration

functions. This is the default setting.

If you try to execute a function that is disabled in the active Privilege Level, the keypad displays the following error message.

Incorrect password! Press Any Key to Continue

Modifying the Protections

Ø To modify the Password and Privilege Levels

1. From the Main Menu, select:

a. General Setup

b. Keypad

c. Keypad Security

The following screen displays:

Press ENTER to accept, ESC to leave

Enter Password: 00000

5-14

Chapter 5 Diagnostic Interface-Keypad GEH-6632 EX2100 User’s Guide

••••

2. Enter the password as follows:

a. Use the Up and Down Arrow buttons to index through the valid digits (0

through 9).

b. Use the Right and Left Arrow buttons to move the cursor to the digit to

edit.

- Press Enter to accept the Password.

- If the password that was entered matches the saved Password value, you can then modify the Privilege Level or Password.

Keypad Security Keypad privilege =Configure & Keypad password =

If it does not match, the keypad displays an error message.

Incorrect password! Press Any Key to Continue

3. Use the Up and Down Arrow buttons to select either the Privilege Level or

Password.

4. Press Enter to edit the parameter. (See Editing Parameters.)

Note When you modify the keypad password, be sure to select Save Parameters To Backup. Otherwise, the password stored in the active parameter will not match the

backup parameter set. That causes the Compare Current Parameters to Backup to identify the Keypad Password parameter as different.

EX2100 User’s Guide GEH-6632 Chapter 5 Diagnostic Interface-Keypad

5-15

••••

Notes

5-16

Chapter 5 Diagnostic Interface-Keypad GEH-6632 EX2100 User’s Guide

••••

Appendix A Warranty and Renewal Parts

Introduction

When ordering a replacement part for a GE exciter, the customer needs to know:

• How to accurately identify the part

• If the part is under warranty

• How to place the order

This information helps ensure that GE can process the order accurately and as soon as possible.

To minimize system downtime if repair is needed, GE recommends that the customer keep a set of spare parts on hand. The Renewal Parts Quotation lists recommended spares.

Appendix A of this manual provides information to help the user identify and obtain replacement parts. It is organized as follows:

Section Page

Identifying the Part ................................................................................................. A-2

Renewal Parts List ........................................................................................... A-2

Part Number Structure ..................................................................................... A-2

Warranty Terms ...................................................................................................... A-4

How to Order Parts ................................................................................................. A-5

Data Nameplate ............................................................................................... A-5

ML Number ..................................................................................................... A-5

EX2100 User’s Guide GEH-6632 Appendix A Warranty and Renewal Parts

A-1

••••

Identifying the Part

An exciter component, or part, is identified by its assigned part number and description. The part number is normally found on a nameplate on the component.

The description is included in the system renewal parts list.

Renewal Parts List

The Renewal Parts List is a separate document that lists the parts of a complete system. This list applies specifically to the equipment furnished on a customer’s

particular application (requisition) at the time of shipment. It includes:

• Part numbers and descriptions

• Quantity used

• Recommended spares to keep onhand

• Normal delivery cycle for obtaining each part

GE provides the Renewal Parts List with the exciter’s custom instructions. If this document is missing, contact the nearest GE sales office or service representative to obtain a replacement copy. You need to provide the following information (see Figure A-4) to correctly identify the system:

• Requisition number

• Model number

Part Number Structure

A GE part number is structured so that different portions of the number identify the type of equipment and location of manufacture. A part falls into one of four categories:

• Order-specific assemblies – Major assemblies or items that make up a specific

exciter, constructed from common assemblies

• Common assemblies – Subassemblies used in many GE exciter products, not

just a specific exciter

• Components – Individual parts that make up assemblies

• Printed wiring boards

These categories and the makeup of their part numbers are defined under Order Specific Assemblies.

A-2

Appendix A Warranty and Renewal Parts GEH-6632 EX2100 User’s Guide

••••

Order Specific Assemblies

These parts make up the particular exciter. Other items obtained specifically for the order may also use a similar part number structure, which provides information about the equipment.

AAA

123

Order product line

Identifies manufacturer as GE Systems, Salem,

Sample Part Number for Order-Specific Assembly

###

Unit &

sequence number of

Sequence/projec

Unique

to req'n

Common Assemblies

Common assemblies are subassemblies used as components of order-specific assemblies. Common assemblies are not designed for a particular exciter, but provide a function used in other GE products.

For example, 36C774524AAG48 is the part number for a cable.

Components

Components are the basic parts that make up assemblies. They represent the lowest discrete level of a system. Component part numbers consist of a combination of alphanumeric characters that define the class and specific item. A sample number is shown below.

104X

109

1ADO38

Item or rating (500 V, 3.2 A FNQ)

Component type (fuse)

Component

Sample Part Number for Component

EX2100 User’s Guide GEH-6632 Appendix A Warranty and Renewal Parts

A-3

••••

Printed Wiring Boards

A printed wiring board is identified by an alphanumeric part (catalog) number stamped near its edge. The structure of a board’s part number is described below.

Note All digits are important when ordering or replacing any board.

The factory may substitute later versions of boards based on availability and design enhancements. However, GE Industrial Systems ensures compatibility of replacement boards.

IS 200 DSPX G# A A A

Artwork revision

Functional revision

Group (variation, G or H)

Functional acronym

Assembly level

Manufacturer (DS & IS for GE in Salem, VA)

Backward compatible

Not backward compatible

200 indicates a base-level board; 215 indicates a higher-level assembly or added components (such as PROM)

Warranty Terms

Sample Board Part Number

The GE Terms and Conditions brochure details product warranty information, including warranty period and parts and service coverage. The brochure is included with customer documentation. It may be obtained separately from the nearest GE Sales Office or authorized GE Sales Representative.

Note Standard warranty is 18 months from shipment or 12 months from when power is first applied, whichever comes first.

A-4

Appendix A Warranty and Renewal Parts GEH-6632 EX2100 User’s Guide

••••

How to Order Parts

Parts still under warranty may be obtained directly from the factory:

(“+” indicates the international access code required when calling from outside of the USA.)

GE Industrial Systems Product Service Engineering 1501 Roanoke Blvd. Salem, VA 24153-6492 USA Phone: + 1 800 533 5885 (United States, Canada, Mexico)

+ 1 540 378 3280 (International)

Fax: + 1 540 387 8606 (All)

Renewals (spares or those not under warranty) should be ordered by contacting the nearest GE Sales or Service Office. Be sure to include:

• Complete part number, located in the renewal parts list

• Part name

• Exciter model, located in it's nameplate

Data Nameplate

The data nameplate is located on the back of the cabinet door. It provides information needed when ordering parts or contacting GE for assistance.

ML Number

Each GE lineup, cabinet (panel)/case, and core unit has a unique identifying catalog number, also called the part or material list (ML) number. This number is structured to provide information about that equipment. The catalog number links the equipment to its requisition, drawings, components, materials, specification item, and shipping documents.

AAA

Identifies manufacturer as GE Industrial Systems, Salem, VA

Sample Exciter ML (Catalog) Number

EX2100 User’s Guide GEH-6632 Appendix A Warranty and Renewal Parts

###

123

Unit & sequence number of components:

CA## = Case assembly

CD## = Core dc drive controller

CI### = Core ac drive controller

LU### = Lineup, multiple case

assembly

PN## = Panel assembly

RL## = Requisition-level assembly

Sequence/project

Order month/year/ product line

Unique to req'n

A-5

••••

Notes

A-6

Appendix A Warranty and Renewal Parts GEH-6632 EX2100 User’s Guide

••••

Appendix B Ratings and Specifications

The actual equipment rating is on your exciter nameplate. This appendix indicates the range of possible product offerings but not necessarily the capability of your exciter.

EX2100 Specification Description

Power Conversion Module (PCM)

Single bridge rating 1,000 and 2,000 A dc at up to 1,000 V ac

Parallel bridge rating 8,000 A dc at up to 1,500 V ac, with up to 6 bridges

Forcing requirements 150% of design Amperes (EDA) for 30 s at 40 ºC

Power Sources

Power for the PCM – Voltage source Auxiliary bus

Generator terminals

Compound Source

600 or 1,000 V versions

Power for the PCM – VA (power) 3,251 KVA (1,000 V version)

Power for the PCM - Frequency 3-phase 50/60 Hz, ± 5%

Power to the Cooling Fans (3) 10 A rms, 125 V ac single source

Flashing power 125-250 V dc battery source, with up to 200 A for at least 10 s

380-480 V ac, 50/60 Hz single-phase auxiliary source

Control power (redundant with 2 bridges, warm backup}

Heat loss in single PCM cabinet 10 KW for a 2000 A, 1,000 V ac PCM

For two ac sources, or one ac and one dc source

Nominal 120 V ac ±15%, with 1 DACA, 10 A rms max.

Battery source 125 V dc, range 80-140 V dc, 10.6 A dc max.

EX2100 User’s Guide GEH-6632 Appendix B Ratings and Specifications

B-1

••••

Input/Output

Potential transformers (PTs)2

Current transformers (CTs, 1 or 5 A) 2 Any two phases, single phase is available

86G dedicated contact input 1 Open for trip

52G dedicated contact input 1 Closed for online

Trip rated contact outputs 2 At 125 V dc the relay break characteristics are:

General Purpose contact inputs 6 Customer contact, 70 V dc supplied by ECTB

General Purpose Form C contact outputs 4 At 125 V dc the relay break characteristics are:

± 10 V differential amplifier input 1

Control

Automatic ac Voltage Regulation Proportional + Integral, software implemented

Manual dc Voltage regulator Proportional + Integral, software implemented

Protection Features

Environmental Control & Protection

Base controls cabinet Continuous operation in a 0 to 40 ºC ambient environment

Base power bridge and auxiliary cabinet Continuous operation in a 0 to 40 ºC ambient environment, with 5 to 95%

Storage Temperature -40 ºC to +70 ºC

Humidity 5 to 95% humidity, non-condensing

Altitude Normal operation at 0 to 1000 m. Derate 6% per 1000 m above 1000 m

Cooling Forced air cooling required for PCM cabinet

Contaminants, withstand 10 PPB of these:

Vibration

Seismic Universal Building Code (UBC) – Seismic Code section 2312 Zone 4

Shipping 72 hours at 0.3 G rms between 4 to 16 Hz

Operating/Installed at Site 1.0 G Horizontal, 0.5 G vertical at 15 to 150 Hz

QTY

3-phase standard, single-phase available

120 V ac nominal 1 VA nominal burden

1 VA nominal burden

Resistive load 0.5 A

Inductive load 0.2 A

Resistive load 0.5 A

Inductive load 0.1 A

± 0.25 % over full voltage range

± 2.0 % over full voltage range

Under Excitation Limiter, (UEL) Over Excitation protection (76) Generator Field Ground detection (64F) Generator Overvoltage protection (24G) Loss of Excitation protection (40) V/Hz limit (24) and trip (24T) Bridge Over Temperature (26) Field Over Temperature (49) Phase Unbalance (22) PT Failure (60)

humidity, non-condensing

Reactive Sulfur, Reactive Chlorine, Hydrogen Sulfide

Sulfur Dioxide, Chlorine Dioxide, Sulfuric Acid

Hydrochloric Acid, Hydrogen Chloride, Ammonia

3 shocks of 15 G, 2 ms impulse for all three axes

B-2

Appendix B Ratings and Specifications GEH-6632 EX2100 User’s Guide

GE EX2100 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety Symbol Legend

Reader Comments

Contents

Chapter 1 Equipment Overview

Introduction

System Overview

Hardware Overview

Software Overview

Technical Characteristics

How to Get Help

Related Documents

Document Distribution

Chapter 2 Functional Description

Introduction

Exciter Hardware

Exciter Configurations

Power Conversion Cabinet

Manual Ac Disconnect (Optional)

Power Conversion Module (PCM)

Gate Pulse Amplifiers (EGPA Board)

Main Dc Contactors. 41A or 41A/41B (Optional)

Free Wheeling Diode De-excitation

Auxiliary Cabinet

Ac Line-to-Line Filters

De-excitation Module (EDEX)

Shaft Voltage Suppressor

Field Flashing Module

Field Ground Detector (EXAM and EGDM)

High Voltage Interface – HVI

Control Cabinet

Diagnostic Interface (Keypad)

Control Module

Simplex Control System

Redundant Control System

Control Power Supplies

Exciter Software

Auto Reference – AUTO REF

AVR Setpoint – EXASP

Automatic Voltage Regulator – AVR

Manual Reference – MANUAL REF

Field Voltage and Current Regulators - FVR & FCR

Under Excitation Limiter – UEL

Power System Stabilizer – PSS

Operator Interface

Turbine Control HMI

Control System Toolbox (toolbox)

Chapter 3 Printed Wiring Boards Overview

Introduction

Control Boards

EBKP Backplane

DSPX Board

ACLA Board

EISB Board

EMIO Board

ESEL Board

I/O Terminal Boards

EPCT Board

ECTB Board

EXTB Board

EDCF Board

EACF Board

Bridge and Protection Boards and Modules

EGPA Board

EXCS Board

EDEX Board

EGDM Module

EXAM Module

Power Supply Boards

EPDM Module

EPBP Backplane

EPSM Module

DACA – Ac to Dc Converter

Related Board Publications

Chapter 4 Terminal Board I/O and Equipment Connections

Introduction

Power Potential Transformer Inputs