GE MIFII GEK-106237P Instruction Manual

GE

g

Digital Energy

MIFII

Digital Feeder Protection with

Recloser

Instruction manual

GEK-106237P

Copyright © 2009 GE Multilin

GE Multilin

215 Anderson Avenue
L6E 1B3 Markham, ON -CANADA
Tel: [phone] Fax: [phone]

E-mail: [e-mail]

Internet: www.GEDigitalEnergy.com

GE Multilin

Avda. Pinoa, 10
48170 Zamudio SPAIN
Tel: [phone] Fax: [phone]

E-mail: [e-mail]

GEK-106237P MIFII Digital Feeder Relay 1

TABLE OF CONTENTS

1. GETTING STARTED 1.1 INSPECTION CHECKLIST

1.2 ENERVISTA MII SETUP SOFTWARE

1.2.1 SYSTEM REQUIREMENTS .............................................................................. 1-4

1.2.2 SAFETY INSTRUCTIONS ................................................................................. 1-4

1.2.3 INSTALLATION.................................................................................................. 1-5

1.3 MII RELAY FAMILY HARDWARE

1.3.1 MOUNTING & WIRING....................................................................................1-11

1.3.2 COMMUNICATIONS........................................................................................ 1-11

1.3.3 FACEPLATE KEYPAD & DISPLAY ................................................................. 1-11

1.4 USING THE KEYPAD AND DISPLAY

1.4.1 HIERARCHICAL MENUS ................................................................................ 1-12

2. PRODUCT DESCRIPTION 2.1 SUMMARY

2.1.1 GENERAL OVERVIEW...................................................................................... 2-1

2.2 INTRODUCTION

2.3 ACCESS SECURITY FEATURES

2.4 OVERCURRENT ELEMENTS

2.4.1 PHASE TIME OVERCURRENT ELEMENT (51P)DIFFERENTIAL UNITS (87-1)

(87-2) 2-4

2.4.2 PHASE(50P1, 50P2) ......................................................................................... 2-6

2.4.3 GROUND TIME OVERCURRENT ELEMENT (51G)......................................... 2-6

2.4.4 GROUND INSTANTANEOUS OVERCURRENT ELEMENTS (50G1, 50G2).... 2-6

2.5 THERMAL IMAGE ELEMENT (49)

2.6 RECLOSER ELEMENT

2.6.1 INTRODUCTION................................................................................................ 2-8

2.6.2 RECLOSER STATUSES ................................................................................... 2-8

2.6.3 RECLOSER SETTINGS ................................................................................. 2-12

2.7 COLD LOAD PICKUP (AVAILABLE ONLY IN OPTION 2 MODELS)

2.8 BREAKER FAILURE TO OPEN (AVAILABLE ONLY IN OPTION 2
MODELS)

2.9 I2 COUNTER (AVAILABLE ONLY IN OPTION 2 MODELS)

2.10 EVENTS (AVAILABLE IN OPTION 1 AND OPTION 2 MODELS)

2.11 OSCILLOGRAPHY (AVAILABLE IN OPTION 1 AND OPTION 2 MODELS)

2.12 MULTIPLE SETTING GROUPS

2.13 MEASUREMENT AND SELF-TEST

2.13.1 MEASUREMENT ............................................................................................. 2-21

2.13.2 SELF-TEST...................................................................................................... 2-21

2.14 USER INTERFACE

2.14.1 LED TARGETS ................................................................................................2-22

2.14.2 KEYPAD AND DISPLAY .................................................................................. 2-23

2.14.3 COMMUNICATION PORTS............................................................................. 2-23

2.14.4 SOFTWARE..................................................................................................... 2-23

2.15 ORDERING CODES

2.16 TECHNICAL SPECIFICATIONS

2.16.1 PROTECTION ELEMENTS ........................................................................... 2-25

2.16.2 METERING FUNCTIONS ................................................................................ 2-26

2.16.3 INPUTS ............................................................................................................ 2-26

2.16.4 POWER SUPPLY ............................................................................................ 2-27

2.16.5 OUTPUTS ........................................................................................................2-27

2.16.6 COMMUNICATIONS........................................................................................ 2-28

2.16.7 ENVIRONMENTAL .......................................................................................... 2-28

2.16.8 TYPE TESTS AND CERTIFICATIONS............................................................ 2-28

2.16.9 PRODUCTION TESTS ....................................................................................2-30

2 MIFII Digital Feeder Relay GEK-106237P

TABLE OF CONTENTS

2.16.10 APPROVALS ....................................................................................................2-30

3. HARDWARE 3.1 DESCRIPTION

3.1.1 MECHANICAL DESCRIPTION..........................................................................3-1

3.1.2 MOUNTING ........................................................................................................3-2

3.1.3 REAR DESCRIPTION ........................................................................................3-3

3.1.4 TYPICAL WIRING DIAGRAM.............................................................................3-4

3.1.5 CONTROL POWER............................................................................................3-6

3.1.6 AC CURRENT TRANSFORMER INPUTS .........................................................3-7

3.1.7 CONTACT INPUTS / OUTPUTS .......................................................................3-8

3.1.8 OUTPUT CONTACTS CONFIGURATION .........................................................3-9

3.1.9 OUTPUTS ISOLATION ....................................................................................3-10

3.1.10 RS232 FRONT COMMUNICATIONS PORT....................................................3-13

3.1.11 RS485 COMMUNICATIONS PORT .................................................................3-14

4. COMMUNICATIONS 4.1 ENERVISTA MII SETUP SOFTWARE

4.1.1 OVERVIEW ........................................................................................................4-1

4.1.2 STARTING COMMUNICATION..........................................................................4-2

4.1.3 MAIN SCREEN...................................................................................................4-2

4.2 FILE

4.2.1 NEW ...................................................................................................................4-3

4.2.2 OPEN..................................................................................................................4-3

4.2.3 SETTINGS FILE CONVERTER..........................................................................4-4

4.2.4 PROPERTIES.....................................................................................................4-4

4.2.5 GET INFO FROM RELAY ..................................................................................4-5

4.2.6 SEND INFO TO RELAY .....................................................................................4-5

4.2.7 PRINT SETUP ....................................................................................................4-5

4.2.8 PRINT PREVIEW ...............................................................................................4-5

4.2.9 PRINT .................................................................................................................4-6

4.2.10 CLOSE................................................................................................................4-6

4.3 SETPOINT

4.3.1 SETTINGS..........................................................................................................4-7

4.3.2 MAIN SETTINGS................................................................................................4-8

4.3.3 ADVANCED SETTINGS.....................................................................................4-8

4.3.4 RELAY CONFIGURATION.................................................................................4-9

4.3.5 LOGIC CONFIGURATION ...............................................................................4-11

4.3.6 DATE /TIME......................................................................................................4-12

4.4 ACTUAL

4.4.1 ACTUAL VALUES ............................................................................................4-13

4.4.2 EVENT RECORDER ........................................................................................4-14

4.4.3 WAVEFORM CAPTURE ..................................................................................4-15

4.5 OPERATIONS

4.6 COMMUNICATION

4.6.1 COMPUTER .....................................................................................................4-17

4.6.2 TROUBLESHOOTING......................................................................................4-20

4.6.3 UPGRADE FIRMWARE VERSION ..................................................................4-21

4.7 VIEW

4.7.1 TRACES ...........................................................................................................4-25

4.7.2 MODBUS MEMORY MAP ................................................................................4-26

4.7.3 LANGUAGES ...................................................................................................4-27

5. SETTINGS 5.1 SETTINGS STRUCTURE

5.2 MAIN SETTINGS

5.2.1 GENERAL SETTINGS........................................................................................5-2

5.2.2 PHASE / GROUND TOC SETTINGS (51P / 51G) ( ..........................................5-3

GEK-106237P MIFII Digital Feeder Relay 3

TABLE OF CONTENTS

5.2.3 THERMAL IMAGE SETTINGS (49)................................................................... 5-4

5.2.4 AUTORECLOSER SETTINGS (79) ................................................................... 5-5

5.3 ADVANCED SETTINGS

5.3.1 PHASE / GROUND TOC SETTINGS (51P/ 51G) (GROUP 2) ......................... 5-8

5.3.2 PHASE / GROUND IOC SETTINGS (50P1/ 50P2/ 50G1/ 50G2) (GROUP 2) ( 5-8

5.3.3 THERMAL IMAGE SETTINGS (49) (GROUP 2) ............................................... 5-9

5.3.4 EVENTS AND OSCILLOGRAPHY MASKS (ONLY ENERVISTA MII SETUP) 5-10

5.3.5 OSCILLOGRAPHY MASKS............................................................................. 5-11

5.3.6 I2 COUNTER ................................................................................................... 5-11

5.3.7 BREAKER FAILURE TO OPEN....................................................................... 5-11

5.3.8 COLD LOAD PICKUP...................................................................................... 5-11

5.4 TIME SYNCHRONIZATION

6. I/0 CONFIGURATION 6.1 INPUT CONFIGURATION (FOR OPTIONS 1 AND 2)

6.1.1 DESCRIPTION OF INPUTS .............................................................................. 6-1

6.1.2 INPUT ELEMENTS ............................................................................................ 6-4

6.2 OUTPUTS AND LEDS CONFIGURATION (FOR OPTIONS 1 AND 2)

6.2.1 DESCRIPTION OF OUTPUTS AND LEDS ....................................................... 6-5

6.2.2 OUTPUT AND LED ELEMENTS ....................................................................... 6-7

7. LOGIC CONFIGURATION
(ONLY OPTION 2 MODELS)

7.1 LOGIC DESCRIPTION

7.2 LOGIC ELEMENTS

8. KEYPAD AND DISPLAY 8.1 DESCRIPTION

8.2 FACEPLATE KEYPAD

8.3 ALPHANUMERIC DISPLAY AND LEDS

8.3.1 DISPLAY ............................................................................................................ 8-3

8.3.2 LEDS.................................................................................................................. 8-3

8.4 OPERATIONS

8.4.1 ONE KEY OPERATION AND LAST TRIP DATA............................................... 8-5

8.4.2 HMI PASSWORD............................................................................................... 8-6

8.5 MENU TREE

9. RELAY COMMISSIONING 9.1 VISUAL INSPECTION

9.2 COMMENTS ON THE TEST EQUIPMENT

9.3 WIRING AND NECESSARY EQUIPMENT

9.4 TARGET LEDS

9.5 POWER SUPPLY TEST

9.6 COMMUNICATIONS

9.7 RELAY SETTING

9.8 CONTACT INPUTS

9.9 CONTACT OUTPUTS

9.10 RELAY METERING

9.10.1 CURRENT METERING.................................................................................... 9-10

4 MIFII Digital Feeder Relay GEK-106237P

TABLE OF CONTENTS

9.11 PHASE IOC HIGH SETTING ELEMENT (50P1)

9.12 PHASE IOC LOW SETTING ELEMENT (50P2)

9.13 MODEL E: GROUND IOC HIGH SETTING ELEMENT (50G1)

9.14 GROUND IOC LOW SETTING ELEMENT (50G2)

9.15 PHASE TOC ELEMENT (51P)

9.15.1 IEC INVERSE CURVE .....................................................................................9-15

9.15.2 IEC VERY INVERSE CURVE...........................................................................9-15

9.15.3 IEC EXTREMELY INVERSE CURVE...............................................................9-15

9.15.4 ANSI INVERSE CURVE ...................................................................................9-16

9.15.5 ANSI VERY INVERSE CURVE ........................................................................9-16

9.15.6 ANSI EXTREMELY INVERSE CURVE ............................................................9-16

9.15.7 IAC INVERSE CURVE .....................................................................................9-16

9.15.8 IAC VERY INVERSE CURVE...........................................................................9-17

9.15.9 IAC EXTREMELY INVERSE CURVE...............................................................9-17

9.15.10 IAC INVERSE LONG CURVE ..........................................................................9-17

9.15.11 IAC INVERSE SHORT CURVE........................................................................9-17

9.15.12 DEFINITE TIME................................................................................................9-18

9.16 GROUND TOC ELEMENT (51G)

9.16.1 IEC INVERSE CURVE .....................................................................................9-19

9.16.2 IEC VERY INVERSE CURVE...........................................................................9-19

9.16.3 IEC EXTREMELY INVERSE CURVE...............................................................9-20

9.16.4 ANSI INVERSE CURVE ...................................................................................9-20

9.16.5 ANSI VERY INVERSE CURVE ........................................................................9-21

9.16.6 ANSI EXTREMELY INVERSE CURVE ............................................................9-21

9.16.7 IAC INVERSE CURVE .....................................................................................9-21

9.16.8 IAC VERY INVERSE CURVE...........................................................................9-21

9.16.9 IAC EXTREMELY INVERSE CURVE...............................................................9-22

9.16.10 IAC INVERSE LONG CURVE ..........................................................................9-22

9.16.11 IAC INVERSE SHORT CURVE........................................................................9-22

9.16.12 EPTAR C CURVE.............................................................................................9-22

9.16.13 DEFINITE TIME................................................................................................9-23

9.17 THERMAL IMAGE ELEMENT (49)

9.18 TIME SYNCHRONIZATION

9.19 USER SETTINGS

9.19.1 MAIN SETTINGS..............................................................................................9-26

9.19.2 ADVANCED SETTINGS...................................................................................9-29

GEK-106237P MIFII Digital Feeder Relay 5

TABLE OF CONTENTS

10. INSTALLATION AND
MAINTENANCE

10.1 INSTALLATION

10.2 GROUND CONNECTION AND DISTURBANCES SUPPRESSION

10.3 MAINTENANCE

10.4 CLEANING INSTRUCTIONS

11. MII FAMILY FAQ
(FREQUENTLY ASKED
QUESTIONS)

11.1 MIFII FAQ

12. MIFII DO’S AND DON’TS 12.1 DO’S

12.2 DON’TS

13. TROUBLESHOOTING
GUIDE

13.1 MIFII TROUBLESHOOTING GUIDE

A. THERMAL IMAGE UNIT A.1 INTRODUCTION

A.2 OPERATING PRINCIPLE
A.3 ALGORITHMS
A.4 DIGITAL TECHNOLOGY AND THERMAL IMAGE RELAYS
A.5 THERMAL CURVE
A.6 MIFII THERMAL CURVES

B. TIME-CURRENT CURVES

FOR 51P AND 51N UNITS

B.1 IEC/BS142 CURVES
B.2 ANSI CURVES
B.3 IAC CURVES

C. MODBUS C.1 MODBUS FORMAT

C.2 READING VALUES
C.3 COMMAND EXECUTION
C.4 SYNCHRONIZATION
C.5 WRITING SETTINGS

C.5.1 FRAME STRUCTURE .......................................................................................C-8

C.6 ERRORS
C.7 MODBUS MAP - SETTINGS
C.8 MODBUS MAP- STATUS

6 MIFII Digital Feeder Relay GEK-106237P

TABLE OF CONTENTS

D. APPLICATION NOTES D.1 TRIP CIRCUIT SUPERVISION FOR MII-FAMILY RELAYS

D.1.1 SETTINGS AND CONFIGURATION .................................................................D-3

E. OPTION C MODELS E.1 INTRODUCTION

E.2 COMUNICATION PORTS
E.3 IEC 60870-5-103

E.3.1 PHYSICAL LAYER ........................................................................................... E-4

E.3.2 LINK LAYER ..................................................................................................... E-5

E.3.3 APPLICATION LAYER ..................................................................................... E-7

F. TIMING ACCURACY FOR 51

ELEMENT

F.1 INTRODUCTION
F.2 TIME OVERCURRENT ELEMENTS
F.3 ANALYSIS OF A PRACTICAL CASE
F.4 INTERNATIONAL STANDARD
F.5 CONCLUSIONS

GEK-106237P MIFII Digital Feeder Relay 1-1

1 GETTING STARTED

1

1 GETTING STARTED

To help ensure years of trouble free operation, please read through the following chapter for information to help guide you
through the initial installation procedures of your new relay.

CAUTION: THE OPERATOR OF THIS INSTRUMENT IS ADVISED THAT IF THE EQUIPMENT IS USED IN A MANNER

NOT SPECIFIED IN THIS MANUAL, THE PROTECTION PROVIDED BY THE EQUIPMENT MAY BE IMPAIRED

INSTALLATION MUST BE ACCORDING TO THE NATIONAL ELECTRIC CODE OF THE APPROPRIATE COUNTRY

IMPORTANT WARNING: For upgrading the relay firmware to version 4.00 or later, it is mandator y that the
EnerVista MII Setup version is 1.10 or higher. For firmware version 5.00 or later, the EnerVista MII Setup
version must be 2.10 or later. Otherwise it may result in damage to the relay

It will take a few seconds for the relay to restart after the completion of the update process. Therefore, before
unplugging the relay, please make sure that the relay main screen shows the analog inputs values.

1-2 MIFII Digital Feeder Relay GEK-106237P

1.1 INSPECTION CHECKLIST 1 GETTING STARTED

1.1INSPECTION CHECKLIST

Open the relay packaging and inspect the relay for physical damage.

Check the label at the side of the relay and check that the relay model is the same model ordered.

Figure 1–1: RELAY IDENTIFICATION LABEL (A4454P3)

Ensure that the mounting screws have been included with the relay.

For product information, instruction manual updates, and the latest software updates, please visit the GE Multilin Home
Page (www.GEdigitalenergy.com/multilin

).

GEK-106237P MIFII Digital Feeder Relay 1-3

1 GETTING STARTED 1.1 INSPECTION CHECKLIST

1

Note: If there is any physical damage detected on the relay, or any of the contents listed are missing, please
contact GE Multilin immediately at:

EUROPE, MIDDLE EAST AND AFRICA:

GE MULTILIN

Av. Pinoa, 10

48170 Zamudio, Vizcaya (SPAIN)

Tel.: [phone], Fax: [phone]

E-mail: [e-mail]

AMERICA, ASIA AND AUSTRALIA:

GE MULTILIN

215, Anderson Avenue

L6E 1B3 Markham, ON (CANADA)

Tel.: [phone], Fax: [phone]

E-mail: [e-mail]

The information provided herein does not intend to cover all details of variations of the equipment nor does it take
into account the circumstances that may be present in your installation, operating or maintenance activities.

Should you wish to receive additional information, or for any particular problem that cannot be solved by referring
to the information contained herein, please contact GENERAL ELECTRIC MULTILIN.

1-4 MIFII Digital Feeder Relay GEK-106237P

1.2 ENERVISTA MII SETUP SOFTWARE 1 GETTING STARTED

1.2ENERVISTA MII SETUP SOFTWARE 1.2.1 SYSTEM REQUIREMENTS

The EnerVista MII SETUP software interface is the preferred method to edit settings and view actual values because the
PC monitor can display more information in a simple comprehensible format.

The following minimum requirements must be met for the EnerVista MII SETUP software to properly operate on a PC:

• Pentium® class or higher processor (Pentium® II 300 MHz or higher recommended)

• Windows® NT 4.0 (Service Pack 3 or higher), Windows® 2000, Windows® XP

• Internet Explorer® 5.0 or higher

• 64 MB of RAM (128 MB recommended)

• 40 MB of available space on system drive and 40 MB of available space on installation drive

• RS232C serial and Ethernet port for communications to the relay

1.2.2 SAFETY INSTRUCTIONS

The ground screw shown in the following figure must be correctly grounded.

Figure 1–2: GROUNDING SCREW LOCATION

If you want to communicate with the relay using a computer through the front serial port, please ensure that the computer

is grounded to the same ground as the relay.

In case of using a portable computer, it is recommended to have it disconnected to its power supply, as in many cases
they are not correctly grounded either due to the power supply itself or to the connector cables used. Powering the
portable PC with its internal battery drastically decreases the possibility of producing permanent damage to the computer
or the relay. Beware of the possibility of losing communication in firmware change processes

This is required not only for pers onal protection, but also for avoiding a voltage difference between the relay
serial port and the computer port, which could produce permanent damage to the computer or the relay.

GE Multilin will not be responsible for any damage in the relay or connected equipment whenever this elemental
safety rule is not followed.

In case of a firmware flashing process, due to the risk of losing communication, GE Multilin will not be
responsible in case of a communication failure if the relay and PC are not grounde d to the sa me point.

Grounding

screw

GEK-106237P MIFII Digital Feeder Relay 1-5

1 GETTING STARTED 1.2 ENERVISTA MII SETUP SOFTWARE

1

1.2.3 INSTALLATION

After ensuring the minimum requirements for using ENERVISTA MII Setup are met (see previous section), use the
following procedure to install the ENERVISTA MII Setup from the enclosed GE ENERVISTA CD.

1. Insert the GE ENERVISTA CD into your CD-ROM drive.

2. Click the Install Now button and follow the installation instructions to install the no-charge ENERVISTA software.

3. When installation is complete, start the ENERVISTA Launchpad application.

4. Click the IED Setup section of the Launch Pad window.

Figure 1–3: ENERVISTA LAUNCH PAD WINDOW

5. In the ENERVISTA Launch Pad window, click the Add Product button and select the relay from the Install Software

window as shown below. Select the “Web” option to ensure the most recent software release, or select “CD” if you do

not have a web connection, then click the Add Now button to list software items for the corresponding relay model.

1-6 MIFII Digital Feeder Relay GEK-106237P

1.2 ENERVISTA MII SETUP SOFTWARE 1 GETTING STARTED

Figure 1–4: ADD PRODUCT

6. If “Web” option is selected, choose from the list the software program related to the specific model and click the

Download Now button to obtain the installation program.

7. When ENERVISTA detects that there is already a version of the program in the Software Library, you can choose
whether to install it directly or to check for more versions.

Figure 1–5: CHECK FOR UPDATED VERSIONS?

GEK-106237P MIFII Digital Feeder Relay 1-7

1 GETTING STARTED 1.2 ENERVISTA MII SETUP SOFTWARE

1

8. If we click the “Check for Updated Versions” button, the program will proceed to search for the different versions of set-

up program from the Web.

9. ENERVISTA Launchpad will obtain the installation program from the Web. If the version you already have is the last

one on the Web, the following screen will appear

10. If there were more versions on the Web, ENERVISTA will then show the user the different setup programs available for

upgrade, with their version, size and release date.

11. Double-click the installation program once its download is complete, to install the EnerVista MII SETUP software.

12. Select the complete path, including the new directory name, where the EnerVista MII SETUP will be installed.

1-8 MIFII Digital Feeder Relay GEK-106237P

1.2 ENERVISTA MII SETUP SOFTWARE 1 GETTING STARTED

13. Click on Next to begin the installation. The files will be installed in the directory indicated and the installation program

will automatically create icons and add EnerVista MII SETUP to the Windows start menu.

14. Follow the on-screen instructions to install the EnerVista MII SETUP software. When the Welcome window appears,
click on Next to continue with the installation procedure.

Figure 1–6: WELCOME TO INSTALLATION WINDOW

15. When the Choose Destination Location window appears, and if the software is not to be located in the default
directory, click Change… and type in the complete path name including the new directory name and click Next to

continue with the installation procedure.

Figure 1–7: CHOOSE DESTINATION LOCATION WINDOW

16. The default program group where the application will be added to is shown in the Selected Progra m Folder window.
Click Next to begin the installation process, and all the necessary program files will be copied into the chosen directory.

GEK-106237P MIFII Digital Feeder Relay 1-9

1 GETTING STARTED 1.2 ENERVISTA MII SETUP SOFTWARE

1

Figure 1–8: PROGRAM FOLDER

17. To finish with the installation process, select the desired language for startup

Figure 1–9: LANGUAGE SELECTION

1-10 MIFII Digital Feeder Relay GEK-106237P

1.2 ENERVISTA MII SETUP SOFTWARE 1 GETTING STARTED

18. Click Finish to end the installation. The MII device will be added to the list of installed IEDs in the ENERVISTA

Launchpad window, as shown below.

GEK-106237P MIFII Digital Feeder Relay 1-11

1 GETTING STARTED 1.3 MII RELAY FAMILY HARDWARE

1

1.3MII RELAY FAMILY HARDWARE 1.3.1 MOUNTING & WIRING

Please refer to the HARDWARE chapter for detailed relay mounting and wiring instructions. Review all WARNINGS and
CAUTIONS.

1.3.2 COMMUNICATIONS

The EnerVista MII SETUP software can communicate to the relay via the faceplate RS232 port, or the rear panel RS485
port. To communicate with the relay via the RS232 port, a standard “straight through” serial cable is used. The DB9 male
end is connected to the relay and the DB9 or DB25 female end is connected to the PC COM1 or COM2 port as described
in the HARDWARE chapter.

To communicate with the relay’s RS485 port from a computer’s RS232 port, a RS232/RS485 converter box is required. GE
Multilin offers F485, DAC300 and RS232/485 converters. This converter box is connected to the computer using a “straight
through” serial cable. A shielded twisted pair (20, 22 or 24 AWG; 0.25, 0.34 or 0.5 mm2) cable is used to connect the
converter box to the relay rear communication terminals. The converter box (-, +, GND) terminals are connected to the
relay (SDA, SDB, GND) terminals respectively. For long communication cables (longer than 1 Km), the RS485 circuit must
be terminated in a RC network (i.e. 120 ohm, 1 nF) as described in the HARDWARE chapter.

1.3.3 FACEPLATE KEYPAD & DISPLAY

Display messages are organized into menus under the main headings: Actual Values, Main Settings, Advanced Settings,
Operations and Change Date&Time. A 5-key keypad and a 16x2 character LCD display (shown below) are used as
elementary local HMI.

Figure 1–10: RELAY KEYPAD AND DISPLAY

Using this keypad it is possible to access all the different menus in the relay and to view and change settings.

1-12 MIFII Digital Feeder Relay GEK-106237P

1.4 USING THE KEYPAD AND DISPLAY 1 GETTING STARTED

1.4USING THE KEYPAD AND DISPLAY 1.4.1 HIERARCHICAL MENUS

Figure 1–11: MOVING THROUGH THE HIERARCHICAL MENU (

As shown in Figure 1–11:, there are 3 hierarchical levels to access the information in the relay. The first level (Main screen)
shows the current value for each phase (I

a

, Ib, I

c, Ig

)

Pressing the Menu button accesses the second level. To access information within the same hierarchical level (horizontal

movement), push the up/down arrow buttons. To access the third level push the “Enter” button when the desired heading is

shown in the display.

To return back to the previous level (from the third to the second level, or from the second to the first one), push the “ESC/
RESET” button.

Refer to chapter 8, for more information on the use of the local keypad and display to access information and change

settings.

GEK-106237P MIFII Digital Feeder Relay 2-1

2 PRODUCT DESCRIPTION 2.1 SUMMARY

2

2 PRODUCT DESCRIPTION 2.1SUMMARY 2.1.1 GENERAL OVERVIEW

PROTECTION

• Phase time overcurrent (51P)

• Two Phase instantaneous overcurrent (high level and

low level) (50P-1, 50P-2)

• Ground time overcurrent (51G)

• Two ground instantaneous overcurrent (high level and

low level) (50G-1, 50G-2)

• Thermal Image (49)

• Cold load pickup (available only in Option 2 models)

• Breaker failure to open (available only in Option 2

models)

• Breaker health (available only in Option 2 models)

•I

2

Counter (available only in Option 2 models)

CONTROL

• 2 Setting groups

• Open/close breaker operations

METERING

• Phase and ground currents

• Thermal image

INPUTS/OUTPUTS

• 4 Current inputs (3 phases, 1 ground)Programmable
digital inputs and outputs (available only in Option 1
and Option 2 models)

COMMUNICATIONS

• Front RS232 port

• Rear RS485 port

USER INTERFACE

• 2x16 LCD Display

• 6 LEDs (4 programmable with Option 1 and Option 2
models)

SECURITY

• Access password for setting changes

• Local access priority

OTHERS

• 1 Oscillography record (available only in Option 1 and
Option 2 models)

• 32 Event recorder (available only in Option 1 and
Option 2 models)

• Configurable Logic (available only in Option 2 models)

2-2 MIFII Digital Feeder Relay GEK-106237P

2.2 INTRODUCTION 2 PRODUCT DESCRIPTION

2.2INTRODUCTION

• MIFII is a microprocessor-based protection relay. designed for the following applications:Main Protection for Medium
and Low voltage feeders.

• Main Protection for Medium size Motors.

• Main Protection for Medium and Low power Transformers (less than 10MVA).

• Differential Protection for Motors, if a CT differential connection is available.

• Backup Protection for power Transformers (for any power level).

• Backup Protection for Generators.

• Backup Protection for Transmission lines.

• Backup Protection for substation busbars.

• Thermal Image Protection/Supervision for Cables, Power Transformers, Grounding Resistors and Generation
Elements.

Negligible over-travel and a high dropout to pick-up ratio (97% typical), along with the possibility of adjusting a time delay
for the instantaneous elements, allow optimal coordination without compromising selectivity.

Both front RS232 port and rear RS485 port may be used to connect a PC for programming settings, monitoring actual
values and for retrieving stored information (list of events, oscillography, etc.). All serial ports of the standard model use the
Modbus® RTU protocol and may be connected to system computers with baud rates from 300, 600, 1200, 4800, 9600 and
19200 bps. The rear RS485 port can be converted into an RS232 port or into a fiber optic (plastic or glass) serial port by

using GE Multilin DAC300, F485 or RS232/485 module, or any other standard converter. The EnerVista MII SETUP

communication software is the Windows® based program used to communicate with the relay. A password system has
been implemented to restrict setting changes to non-authorized users, both by relay keypad and PC software.

A special model with IEC60870-5-103 protocol is also available, which uses the rear port with 9600 and 19200 bps baud
rates.

MIFII uses flash memory technology, which allows field upgrades (through EnerVista MII SETUP software) as new features
are added. Upgrades can only be performed through the communications port on the front of the unit.

The following one line (single line) diagram (Figure 2–1:) illustrates the relay functionality using ANSI (American National
Standards Institute) device numbers.

Figure 2–1: ONE LINE (SINGLE LINE) DIAGRAM SHOWING MIFII FUNCTIONS

GEK-106237P MIFII Digital Feeder Relay 2-3

2 PRODUCT DESCRIPTION 2.3 ACCESS SECURITY FEATURES

2

2.3ACCESS SECURITY FEATURES

MII family relays have several security features to restrict rear port operation when an operator is making changes by the
local port or relay keypad, and/or to block access to setting changes for non-authorized users.

The relay has an access priority system, giving priority to local access over remote access. The access mode is Local

either when the relay display is inside MAIN SETTINGS, ADVANCED SETTINGS or OPERATIONS menu, or when the
front port (RS232) communication is established. When the access is local by the RS232 port, the back port is disabled and
the relay will not serve any petition or command sent by the rear port. When the access is local by keypad, the back port is
not disabled, and actual values can be read, but setting changes and operations will not be allowed by the back port.

Setting changes, either by keypad and display or by communications, are password protected: the user has to enter a

password to change any setting. When the password is entered, the password protection is disabled and the user can
change any setting freely. Thirty minutes after the last setting change performed, or when the ESC/RESET key is pressed
for three seconds or more, the relay returns automatically to the password protected status and will ask for the password
again if a new attempt to change settings is made.

2-4 MIFII Digital Feeder Relay GEK-106237P

2.4 OVERCURRENT ELEMENTS 2 PRODUCT DESCRIPTION

2.4OVERCURRENT ELEMENTS

2.4.1 PHASE TIME OVERCURRENT ELEMENT (51P)DIFFERENTIAL UNITS (87-1) (87-2)

A Phase Time Overcurrent unit is provided in the relay. There are three possibilities for the curve selection, depending on
the selected model.

IEC curves comply with the criteria specified in the IEC255-4 Standard and British Standard BS142

ANSI curves comply with ANSI C37.90 standards

IAC curves simulate the behaviour of GE IAC relays.

A time dial can be applied to any of these curves to optimize co-ordination with other devices in the net. Additionally, there
is a possibility to define a User’s Curve, which can be used for both three-phase overcurrent and ground elements.

In order to avoid undesired trips, time overcurrent elements will not pickup till a value of 1.05 * Set value.

Due to design criteria, actual pickup level has been INTENTIONALLY set to +5% over the set value to ensure that even in
the worst case scenario the relay will NEVER TRIP under the intended setting.This meets IEC international standards.

2.4.1.1 IEC CURVES

The general formula for IEC/BS142 curves is as follows:

Where:

D =Time Dial setting (set in the relay by user).
V = I / I

pickup setting

> 1.05

2.4.1.2 ANSI CURVES

The general formula for all ANSI curves is as follows:

Where:

M =Time Dial setting (set in the relay by user).
V = I / I

pickup setting

> 1.05

CURVE NAME A P Q B K

Mod Inverse (IEC Curve A) 0.14 0.02 1 0 0

Very Inverse (IEC Curve B) 13.5 1 1 0 0

Extremely Inverse (IEC Curve C) 80 2 1 0 0

CURVE NAME A B C D E

Inverse 0.0274 2.2614 0.3000 -4.1899 9.1272

Very Inverse 0.0615 0.7989 0.3400 -0.2840 4.0505

Extremely Inverse 0.0399 0.2294 0.5000 3.0094 0.7222

GEK-106237P MIFII Digital Feeder Relay 2-5

2 PRODUCT DESCRIPTION 2.4 OVERCURRENT ELEMENTS

2

2.4.1.3 IAC CURVES

The general formula of IAC Curve is as follows:

Where:

TDM: Time Dial Multiplier (Set in the Relay by User)

I / I

pickup setting

> 1.05

2.4.1.4 USER CURVES

The general formula for the user curve is as follows:

Where:

D =Time Dial setting (set in the relay by user).
V =I / I

pickup setting

> 1.05

I =Input Current
T =Operate Time (sec.)
A, P, Q, B, K =Constants defined in the standard, as follows:

Settings available for the phase time overcurrent unit allows the user to: enable/disable the unit; set the pickup value
(between 0.1 – 2.4 times the rated current in case of 1/5 A ground, or 0.005-0.12 A in case of sensitive ground) and set the
current/time operating characteristic (type and time dial).

Note: The relay will use either IEC, IAC or ANSI curves, depending on the model. Refer to Appendix B for a deeper
explanation of the curves.

PARAMETERS A B P O K

Range 0 – 125 0-3 0-3 0-2 0-1.999

Step 0.001 0.001 0.001 0.001 0.001

Unit Sec. Sec. NA NA Sec.

Default value 0.05 0 0.04 1 0

2-6 MIFII Digital Feeder Relay GEK-106237P

2.4 OVERCURRENT ELEMENTS 2 PRODUCT DESCRIPTION

2.4.2 PHASE(50P1, 50P2)

MIFII provides 2 phase instantaneous overcurrent elements, 50P1 (‘H’ for high pickup) and 50P2 (‘L’ for low pickup). Each
one can be enabled/disabled and set independently. Settings from these elements allow to set the pickup value from 0.1 to
30 times the rated current, and the time delay from 0.00 to 600.00 seconds.

2.4.3 GROUND TIME OVERCURRENT ELEMENT (51G)

The Ground Time Overcurrent element offers the same setting possibilities as the Phase Time Overcurrent element. The
ground current can be obtained from a residual connection on the CTs. For a more sensitive ground current detection, a
window type (zero sequence) CT, taking the three phases inside its windows can be used. Refer to figure 3-6 for more
details.

2.4.4 GROUND INSTANTANEOUS OVERCURRENT ELEMENTS (50G1, 50G2)

The MIFII relay provides 2 Ground Instantaneous Overcurrent Elements, 50G1 (‘1’ for High pickup) and 50G2 (‘2’ for Low
pickup). Settings and ranges available for these elements are the same ones described for the Phase Instantaneous
Overcurrent Elements, 50P1 and 50P2.

GEK-106237P MIFII Digital Feeder Relay 2-7

2 PRODUCT DESCRIPTION 2.5 THERMAL IMAGE ELEMENT (49)

2

2.5THERMAL IMAGE ELEMENT (49)

A Thermal Image Element is included among the relay functions. This unit provides protection against overheating due to
overloading conditions. The operating time curve is set from the time curve family, as a function of the time constant T1
(settable between 3 and 600 minutes). The cooling time constant

T2 can be set between 1 and 6 times the heating time

constant T1. Refer to Appendix A for a detailed explanation on the operating principles of this element.

2-8 MIFII Digital Feeder Relay GEK-106237P

2.6 RECLOSER ELEMENT 2 PRODUCT DESCRIPTION

2.6RECLOSER ELEMENT 2.6.1 INTRODUCTION

The MIFII autorecloser allows producing up to four selectable reclosure ‘shots’ prior to locking out. Thanks to the use of
masks, the user can choose which conditions will produce the reclose initiation and what protection functions will be
enabled in each recloser shot. This allows implementing protection schemes that would require special wiring and functions
in conventional equipment.

As an example of application, the user may want the first protection trip to be for instantaneous overcurrent, and the next
trip to be timed over current, in order to allow a time for output fuses to burn of a feeder branch. For this purpose, it is
necessary to disable the IOC element after the first shot.

The reclose initiation can be started by a trip or from the physical input AR INITIATE. There are settings for selecting which
protection function and/or if physical input will initiate the autorecloser.

Also, settings are available for selecting which protection functions will be enabled after every autorecloser shot.

2.6.2 RECLOSER STATUSES

The following diagram describes the different possible statuses for the recloser and the transitions between statuses.

Figure 2–2: AUTORECLOSER GENERAL STATUS DIAGRAM

GEK-106237P MIFII Digital Feeder Relay 2-9

2 PRODUCT DESCRIPTION 2.6 RECLOSER ELEMENT

2

Figure 2–3: AUTORECLOSER DETAILED STATUS DIAGRAM

2-10 MIFII Digital Feeder Relay GEK-106237P

2.6 RECLOSER ELEMENT 2 PRODUCT DESCRIPTION

Figure 2–4: AUTORECLOSER DETAILED STATUS DIAGRAM (2)

WAIT RESET TO DELAY

CHECK BLOCK

READY FOR

FIRST RECLOSE

WAIT FOR 52 OPEN

INITIATE

DEAD TIME n

ISSUE CLOSE BREAKER

OPERATION
INCREASE n

WAIT FOR 52 CLOSE

INITIATE RST TIME

BLOCK

LAST RECLOSE +
INCOM.SEQ.TIME

BLOCK + RI + 52CLOSE

RI·LAST SHOT +
INCOM.SEQ.TIME

BLOCK + RI·LAST SHOT

LOCKOUT

DEAD TIME

n

52 CLOSE

T

RESET LOCKOUT

BLOCK

RI

OPEN

T

RESET

RI·

LAST SHOT

RI·

LAST SHOT

GEK-106237P MIFII Digital Feeder Relay 2-11

2 PRODUCT DESCRIPTION 2.6 RECLOSER ELEMENT

2

RECLOSE ENABLED

The reclosure scheme is considered to be enabled when all of the following conditions are true:

• The “AR FUNCTION” is set to ENABLED.

• The scheme is not in the LOCKOUT state.

• The “BLOCK” input is not asserted.

RECLOSE INITIATION

The autoreclose scheme is initiated by an enabled trip signal or physical input AR INITIATE. The scheme is initiated
provided the circuit breaker is in the closed state before protection operation and RESET LOCKOUT DELAY timer times
out.

RECLOSE IN PROGRESS (RIP)

RIP is set when a reclosing cycle begins following a reclose initiate signal. Once the cycle is successfully initiated, the RIP
will seal-in and the scheme will continue through its sequence until one of the following conditions is satisfied:

• The close signal is issued when the AR DEAD TIME timer times out.

• The scheme goes to lockout.

While RIP is active, the scheme checks that the breaker is open and the shot number is below the limit, and the being
measuring the AR DEAD TIME.

Each of the four possible shots has an independently settable dead time: AR DEAD TIME 1 ... AR DEAD TIME 4.

LOCKOUT

Scheme lockout blocks all phases of the reclosing cycle, preventing automatic reclosure, if any of the following occurs:

• The maximum shot number was reached.

• The incomplete sequence AR INCOM. SEQ TIME timer times out.

The recloser will be latched in the LOCKOUT state until the breaker has been closed and stay closed for the reset lockout
time AR RESET LO DELAY.

CLOSE

After the dead time elapses, the scheme issues the close signal. The close signal is latched until the breaker closes of the
scheme goes to LOCKOUT.