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.

2-12 MIFII Digital Feeder Relay GEK-106237P

2.6 RECLOSER ELEMENT 2 PRODUCT DESCRIPTION

2.6.3 RECLOSER SETTINGS

AR FUNCTION: the recloser may operate only if it is ENABLED. If DISABLED the recloser will be Out of

Service.

AR MAX SHOTS: specifies the number of reclosures that can be attempted before recloser goes to

LOCKOUT status, because the fault is permanent.

AR DEAD TIME 1 ... 4: these are the intentional delays before first, second, third and fourth breaker automatic

reclosures.

AR RESET LO DELAY: this setting establishes how long the breaker should stay closed after a manual close

command, in order for the autorecloser to reset from LOCKOUT.

AR INCOM. SEQ TIME: this timer is used to set the maximum time interval allowed for a single reclose shot. It is

started whenever a reclosure is initiated and is active when the scheme is in the
RECLOSE IN PROGRESS state. If all conditions allowing a breaker closure are not
satisfied when this time expires, the scheme goes to LOCKOUT.

AR RST TIME: a reset timer output resets the recloser following a successful reclosure sequence. The

setting is based on the breaker “reclaim time” which is the minimum time required
between successive reclose sequences.

Autoreclose initiation masks: used to select which events will initiate the autorecloser scheme.

After 1

st

, 2nd, 3rd, 4th trip masks: used to select which function will be enabled to trip.

GEK-106237P MIFII Digital Feeder Relay 2-13

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

2

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

This element avoids undesired operation of the overcurrent elements in case of high currents produced when energizing a
line that has been open for a long period of time.

This element detects when the current values of the three phases are lower than 4% of the rated current (In). In this
moment, a timer (T IN) is started.

If the currents return to values above 4% In before the timer has timed out, the unit returns to its original status.

When the timer has timed out, the tap settings of the instantaneous phase elements (50P1 and 50P2) are multiplied by a
constant K50P, and the phase TOC (51P) tap settings are multiplied by a constant K51P. A status signal turns on indicating
that the Cold Load Pickup is enabled, and the corresponding event is generated.

For exiting the CLP status, when the current values of the three phases are above 8% In, a T OUT timer is started.

If the current values fall below 8%In before the timer countdown has finished, the unit remains in CLP status.

If the timeout finishes and current values are still above 8%In, the CLP status is disabled and the relay returns to its original
settings. The CLP status signal is deactivated, and the corresponding event is generated.

The T IN and T OUT timer values, as well as the multiplying constants K50P and K51P, and the function permission are
settings associated to the COLD LOAD PICKUP. These settings are included in the ADVANCED SETTINGS group. They
will be described in detail in the SETTINGS section.

2-14 MIFII Digital Feeder Relay GEK-106237P

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

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

This element produces an alarm if the breaker does not open after a tripping command.

This element can be enabled independently from having an input that indicates the breaker status:

If a breaker status input is enabled:

After a trip, the following conditions are checked:

1. If the breaker is closed, the BREAKER FAILURE function is started.

2. If the breaker is open, the unit checks the current. If the highest current is over 8% of the rated current, the BREAKER
FAILURE function is started.

After the BREAKER FAILURE pickup, a timer is started. When the timer countdown finishes, if the function is not disabled,
the FAILURE TO OPEN status signal is activated, and the corresponding event is generated.

The Breaker Failure to Open signal is reset when the breaker is open and there is no current. once the breaker has been
opened, it gets closed again.

If a breaker status input is not enabled:

After a trip, the unit checks whether the highest current value is over 8% of the rated current. In this case, a timer is started.
When the timer countdown finishes, if the current value has not fallen below 4% of the rated current, the FAILURE TO
OPEN status signal is activated, and the corresponding event is generated.

The Breaker Failure to Open signal is reset when the current value, of at least one phase, rises above 8% of the rated
current after all of the phase currents have fallen below 4% of it.

The settings associated to BREAKER FAILURE TO OPEN are the function permission and the timer value. They are
included in the ADVANCED SETTINGS group. They will be described in the SETTINGS section.

GEK-106237P MIFII Digital Feeder Relay 2-15

2 PRODUCT DESCRIPTION 2.9 I2 COUNTER (AVAILABLE ONLY IN OPTION 2 MODELS)

2

2.9I2 COUNTER (AVAILABLE ONLY IN OPTION 2 MODELS)

This counter is intended for breaker maintenance. It accumulates the breaker aging produced by a trip or a breaker
opening. In order to incorporate the breaker history, in the case of second-hand breakers, the system allows assigning an
initial value to the accumulated Amps and to the number of opening operations.

There is one I2 counter for the three phases, where every time a trip or a breaker opening is produced, the counter value is
increased (in secondary value). If the tripping current is lower than the rated current, the accumulated value will be the
rated current.

When the counter reaches or exceeds a limit value (setting), an I

2

ALARM signal will be produced in the unit status, and the

corresponding event will be generated.

There is also a Breaker Opening counter available, for informational purposes only.

The I

2

counter, and the number of openings counter are stored in capacitor backed up RAM memory.

The setting associated to the I2 COUNTER is the limit value of the counter that will produce the I2t ALARM. This setting is
included in the ADVANCED SETTINGS group, and is described in detail in the SETTINGS section.

Both the I2 and the Number of Openings counters can receive an operation command to modify their contents. From the
ENERVISTA MII SETUP program, a valid value can be set for any of these two counters. The valid range for the I2 counter
is from 0.000 to 999.000, and for the “Number of Openings” counter it is from 0 to 999.

From the keypad and display it is only possible to set both fields to zero.

2-16 MIFII Digital Feeder Relay GEK-106237P

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

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

MIFII stores an historical record with the last 32 events. Each event contains the event description, date and time (4 ms
accuracy), the current values in phases and ground at that moment, and a summary of the status signals that can produce
events, and whether they were active or not in that moment.

In EnerVista MII SETUP there is an “EVENTS” menu, where the user can check how many events have been produced

since the last time the Events were deleted. If the number of events produced is higher than 32 (maximum number of
events stored), this means that only the last 32 will be stored.

This event record is stored in a capacitor backed up RAM memory. Events functionality in MIFII is performed via the
EnerVista MII SETUP software.

Inside the ADVANCED SETTINGS group, there is a sub-group called EVENT MASKS, from where the different causes that
can produce events can be masked. They are detailed in the SETPOINT – SETPOINT – ADVANCED SETTINGS – EVENT
MASK section. The following table shows a list of all possible events.

MIFII relay with option C stores an historical record with the last 100 events. Each register contains the event description,
date and time (4ms accuracy), the current values in phases and ground at that moment and a summary of the status
signals tha can produce events and whether they were active or not in that moment.

Table 2–1: LIST OF EVENTS

DESCRIPTION OPTION 1 OPTION 2

50P1 Pickup/Drop out Yes

50P2 Pickup/Drop out Yes

50G1 Pickup/Drop out Yes

50G2 Pickup/Drop out Yes

51P Pickup/Drop out Yes

51G Pickup/Drop out Yes

49 Alarm Pickup/Drop out Yes

50P1 Trip Yes

50P2 Trip Yes

50G1 Trip Yes

50G2 Trip Yes

51P Trip Yes

51G Trip Yes

49 Trip Yes

General trip Yes

50P1 Trip enable/disable by digital input Yes Yes

50P2 Trip enable/disable by digital input Yes Yes

50G1 Trip enable/disable by digital input Yes Yes

50G2 Trip enable/disable by digital input Yes Yes

51P Trip enable/disable by digital input Yes Yes

51G Trip enable/disable by digital input Yes Yes

49 Trip enable/disable by digital input Yes Yes

General trip enable/disable by digital input Yes Yes

Protection status in service/out of service Yes Yes

Digital output 1 active/non active Yes Yes

Digital output 2 active/non active Yes Yes

Digital output 3 active/non active Yes Yes

Digital output 4 active/non active Yes Yes

Digital input 1 active/non active Yes Yes

Digital input 2 active/non active Yes Yes

Settings change disabled by digital input active/non active Yes Yes

Trip operation by digital input Yes Yes

Trip operation by command Yes Yes

Auxiliary digital output latch reset Yes Yes

GEK-106237P MIFII Digital Feeder Relay 2-17

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

2

OPTION 1: MIFII***E1**00; OPTION 2: MIFII***E2**00

DESCRIPTION OPTION 1 OPTION 2

Close Breaker Yes Ye s

52B open/closed No Yes

52A open/closed No Yes

52 open/closed No Yes

Group 2 selection by digital input Yes Yes

Oscillography triggered by digital input Yes Yes

Oscillography triggered by command Yes Yes

Breaker failure No Yes

I

2

Alarm

No Yes

Settings change Yes Yes

EEPROM failure Yes Yes

User settings/Factory settings Yes Yes

Table 2–1: LIST OF EVENTS

2-18 MIFII Digital Feeder Relay GEK-106237P

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

2.11OSCILLOG RAPHY (AVAILABLE IN OPTION 1 AND OPTION 2 MODELS)

MIFII1000/3000 stores an oscillography record, with a resolution of 8 samples per cycle with a length of 24 cycles
(including 2 pre-fault cycles), with the following information:

Instantaneous values ofphase (Ia, Ib, Ic) and ground (Ig) currents. The 2 first cycles are pre-fault cycles.

• Digital information:

•Pickups (protection functions

1

)

•Trip inhibition by digital input (protection functions2)

•Trips (protection functions3)

•Ready (protection in service)

•Auxiliary digital outputs

•Digital inputs

•Breaker 52A, Breaker 52B, (status of the digital inputs)

•Status 52 (status of the circuit breaker) (only OPTION 2 models)

•Breaker opening failure (only OPTION 2 models)

•I

2

alarm (only OPTION 2 models)

•Cold load pickup (only OPTION 2 models)

•Group 2 selection by digital input

•EEPROM failure

•Default settings/User settings

• Date and time

• Model

• Number of oscillo

• Value of the differential Ia, Ib, Ic and Ig currents at the moment of the oscillography trigger

• Active group at the moment of the oscillography trigger

• Element settings when retrieving the oscillography record.

• Oscillography and event mask

• File to emulate the relay model in PC program, with the relay settings and memory map

The number of oscillo is a circular counter that increases with each generated oscillography. This value appears on the
relay status and is used only for informative purposes.

The oscillography record is stored in a capacitor backed up RAM memory.

MIFII functionality related to oscillography is performed from the ENERVISTA MII SETUP program. The oscillography
record obtained is stored on the PC in a COMTRADE-IEEE C37.111-1991 format.

There are four possible causes that can produce an oscillography trigger:

1. Pickup of one of the protection functions

2. Trip of one of the protection functions

3. Oscillography trigger by communications

4. Oscillography trigger by digital input

1. Protection functions: 50P1, 50P2, 50G1, 50G2, 51P, 51G, 49, general

2. Protection functions: 50P1, 50P2, 50G1, 50G2, 51P, 51G, 49, general

3. Protection functions: 50P1, 50P2, 50G1, 50G2, 51P, 51G, 49, general

GEK-106237P MIFII Digital Feeder Relay 2-19

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

2

In the ADVANCED SETTINGS group, there is a sub-group called OSCILLOGRAPHY MASKS, from where the above-

mentioned causes can be masked. They are detailed in the SETPOINT – SETPOINT – ADVANCED SETTINGS –

OSCILOGRAPHY MASK section.

MIFII relay with option C stores 4 oscillography records, with a resolution of 16 samples per cycle with a total length of
150 cycles (including prefault cycles) each register. In General Settings there is a setting for prefault cycles. It is
adjustable from 10 to 140 cycles.

2-20 MIFII Digital Feeder Relay GEK-106237P

2.12 MULTIPLE SETTING GROUPS 2 PRODUCT DESCRIPTION

2.12MULTIPLE SETTING GROUPS

Two independent Setting Groups are available in the permanent (non-volatile) memory of the MIFII relay. Only one of the
two is active at a given time. Users can select which setting group is active using a setting, sending a command to the relay

from the communications program, or by a digital input in OPTION 1 and OPTION 2 models.

Settings are divided in two different categories: Main Settings and Advanced Settings. This makes setting the relay
extremely simple for those users who want to use just the Main functions of the MIFII relay. Users who require the full
functionality of the relay can use the Advanced Settings.

GEK-106237P MIFII Digital Feeder Relay 2-21

2 PRODUCT DESCRIPTION 2.13 MEASUREMENT AND SELF-TEST

2

2.13MEASUREMENT AND SELF-TEST 2.13.1 MEASUREMENT

MIFII provides actual values for phase and ground currents Accuracy is 1% of injected current at rated current, and 3% of
injected current ±0.1% full scale in the complete range.

2.13.2 SELF-TEST

Self-monitoring tests are carried out both when the unit is started up and during normal operation. Any internal problem
detected by the self-monitoring function will issue an alarm and the READY output contact will be released, indicating an
out of service condition.

2-22 MIFII Digital Feeder Relay GEK-106237P

2.14 USER INTERFACE 2 PRODUCT DESCRIPTION

2.14USER INTERFACE 2.14.1 LED TARGETS

There are 6 LED Targets in the front of the relay. The first one is green (‘READY’ -relay in service-) and cannot be
configured; the second one is red and fixed for trip, while the other 4 can be configured by the userin OPTION1 and
OPTION2 models. The default configuration of the LEDs is shown in the following figure.

Figure 2–5: MIFII LEDS DEFAULT CONFIGURATION

It is possible to configure the color of the 4 configurable LEDs between red and green using the keypad of the front panel of

the relay (for details, refer to Chapter 8).

The indication of each LED is as follows:

READY: The relay is powered up, its power supply is receiving Vdc or Vac, and all the internal circuits are

working properly. The relay status setting is set as “RDY” (ready) and at least one of the protection
functions is enabled. If the LED is off with the above-mentioned conditions, this indicates a loss of
auxiliary supply voltage or an internal HW/SW critical failure condition.

TRIP: The relay has issued a trip, activating the corresponding tripping output contact.
PHASE: Indicates that the trip has been issued by one of the Phase Overcurrent Elements (51P, 50P1,

50P2).

GROUND: Indicates that the trip has been issued by one of the Ground Overcurrent Elements (51G, 50G1,

50G2).

INST: Indicates that the trip has been issued by one of the Instantaneous Elements, either phase or

ground elements (50P1, 50P2, 50G1, 50G2).

PICKUP: Indicates that at least one of the protective elements has picked up.

LEDs associated to tripping functions are latched and once they have been turned on, they remain on until the ESC/RESET
button is pressed for more than 3 seconds (RESET) providing that the trip condition has disappeared. The LED associated

to function pickup is self-reset type, and stays on while the pickup condition (current above setting) exists.

GEK-106237P MIFII Digital Feeder Relay 2-23

2 PRODUCT DESCRIPTION 2.14 USER INTERFACE

2

2.14.2 KEYPAD AND DISPLAY

A five-button keypad allows access to MIFII relay information and settings changes. Measurement data (actual values), five
last trip information (fault reports) and settings are shown on the 16x2 character LCD display.

The keypad includes the functionality to modify the contrast of the display (refer to Chapter 8 for details).

The event list, oscillography, I/O and logic configuration can be accessed only from the EnerVista MII SETUP program.

2.14.3 COMMUNICATION PORTS

The front RS232 and the rear RS485 port provide interface with the relay. All serial ports of the standard model use the
Modbus® RTU protocol and may be connected to system computers with baud rates from 300 to 19200 bps. Up to 32 MIFII
relays can be connected (daisy-chained) on the same communication circuit. Each relay must be assigned a different
Modbus Address (using a setting) if multiple relays are connected on the same circuit.

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

2.14.4 SOFTWARE

MIFII units are supplied together with EnerVista MII SETUP software, a Windows

®

based software that allows
communication with the relay for data viewing and retrieval, as well as oscillography, I/O configuration and logical
configuration (in models where these features are available).

2-24 MIFII Digital Feeder Relay GEK-106237P

2.15 ORDERING CODES 2 PRODUCT DESCRIPTION

2.15ORDERING CODES

MIFII is supplied as 4U high and ¼ of a 19” rack wide. MIFII relays can be mounted in ¼ rack cases, one relay per case.
The information required to completely specify the relay is provided in the following table:

ACCESSORIES

A depth-reducing collar can be ordered separately. This collar reduces the mounting depth in 63 mm (2.48 inches).

Table 2–2: ORDERING CODE

MIFII - - - - - - - - - - DESCRIPTION

Application:

P 3 Phase + Ground relay

N Single Phase relay

Curves

A ANSI Curves

IIEC Curves

UIAC Curves

C EPTAR-C Curves(only for single phase models)

Phases range:

0

No CT(always for single phase models)
Phase CT In = 1/5A (0.1-2.4 In)(Three phase models)

1 Phase CT In = 1A (0.1-2.4 A)

5 Phase CT In = 5A (0.5-12 A)

Ground range:

0 Ground CT In = 1/5 A (0.1-2.4 In)

1 Ground CT In = 1A (0.1-2.4 A)

5 Ground CT In = 5A (0.5-12 A)

N

Sensitive ground In = 1 A
(0.005-0.12 A)

L

Very sensitive ground. In = 1 A
(0.002-0.048 A)

Language:

E English language

F French language

T Turkish language

Options:

0 Basic model (no options)

1

Option 1

1

1.OPTION 1: Configurable I/O, event recording, oscillography

2

Option 2

2

2.OPTION 2: Includes all OPTION 1 features, plus cold load pickup, breaker failure to open protection, breaker monitoring, breaker

maintenance and configurable logic.

Recloser option:

0 Without recloser

R With recloser (not available in the basic model)

Power Supply:

LO 24-48 Vdc (Range: 19~58 Vdc)

HI

110-250 Vdc (Range: 88~300 Vdc)
110-230 Vac (Range: 88~264 Vac)

Protocol:

0 Standard Model (Modbus RTU)

C Protocol IEC60870-5-103

Conformal Coating:

0 Without Harsh Environment Conformal Coating

H With Harsh Environment Conformal Coating

GEK-106237P MIFII Digital Feeder Relay 2-25

2 PRODUCT DESCRIPTION 2.16 TECHNICAL SPECIFICATIONS

2

2.16TECHNICAL SPECIFICA TIONS

2.16.1 PROTECTION ELEMENTS

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE

2.16.1.1 PHASE / GROUND TIME OVERCURRENT (51P,51G)

Current: Fundamental
Pickup Level: 0.1 – 2.4 times In (rated current) in steps of 0.01 x In (51P & 51G if 1/5 A

ground models)

0.005-0.12 A in (51G in sensitive ground model)

Dropout Level: 97% (typical) of Pickup
Level Accuracy: ±1% at rated current

±3% of injected current ±0.1% full scale in the whole range

Curve Shapes: IEC (B.S.) A/B/C

ANSI Inverse, Very Inverse, Extremely Inverse, user defined

IAC Inverse, Very Inverse, Extremely Inverse, Inverse Short or Inverse Long

Time delayed (0.00 to 600.00 sec. in steps of 0.01 sec).

Time Dial: 0.05 to 2 in steps of 0.01 for IEC curves

0.5 to 20 in steps of 0.1 for ANSI curves

0.5 to 10 in steps of 0.1 for IAC curves
Reset Type: Instantaneous
Timing Accuracy: ± 5% + 50 ms of set time for 2< I < 20 times the Actual Pickup Level for IEC/

ANSI/definite time curves. For I<2 times the Actual Pickup refer to
APPENDIX F TIMING ACCURACY FOR 51 ELEMENT.

± 6% of set time for 2 < I < 20 times the Actual Pickup for IAC curves

Type/measure time: DFT of 1 cycle

2.16.1.2 PHASE / GROUND INSTANTANEOUS OVERCURRENT (50P1, 50P2, 50G1, 50G2)

Current:

Pickup Level:

Dropout Level:

Level Accuracy:

Overreach:

Time Delay:

Reset Type:

Operate Time:

Timing Accuracy:

Type/measure time:

Fundamental

0.1 to 30.0 times In (rated current) in steps of 0.1 x In. (50P1/P2 & 50G1/G2

for 1/5 A ground models)

0.005 to 0.12 A (50G1/G2 for sensitive ground models)

97% (typical) of Pickup

±1% at rated current
±3% of injected current ±0.1% full scale in the whole range

< 2%

0.00 to 600.00 sec. in steps of 0.01 s

Instantaneous

Between 20 and 30 ms for I> 2 x Actual Pickup

± 5% or 50ms(whichever is greater) of settled time for I > 2 times the Actual
Pickup

DFT of 1 cycle

2-26 MIFII Digital Feeder Relay GEK-106237P

2.16 TECHNICAL SPECIFICATIONS 2 PRODUCT DESCRIPTION

2.16.2 METERING FUNCTIONS

2.16.3 INPUTS

2.16.1.3 THERMAL IMAGE ELEMENT (49)

Current:

Pickup Level:

Dropout Level:

Level Accuracy:

Fundamental

0.10 to 2.40 In in steps of 0.01 x In

Between 97% typical of Pickup Level

±1% at rated current
±3% of injected current ±0.1% full scale in the whole range

Heating Constant τ1:
Cooling Constant τ2:

Thermal Image Alarm:

Timing Accuracy:

3 to 600 min in steps of 1 min.
1 to 6 times τ1 in steps of 1.

From 70% to 100% I

pickup

in steps of 1%

5% for operate times greater than 2 sec.

2.16.2.1 FUNDAMENTAL CURRENT

Accuracy: ±1% at rated current

±3% of injected current ±0.1% full scale in the whole range

2.16.3.1 AC CURRENT

Secondary Rated Current:

Frequency:

Relay CT Burden:

Current Withstand:

1m 5 A depending on the selected model, or 50 mA for sensitive ground
models

50 / 60 Hz ±3 Hz (The unit can be set to 50 or 60 Hz)

< 0.2 VA @ In = 5A secondary

< 0.08 VA @ In = 1A secondary

< 0.08 VA @ In = 1A sensitive ground, secondary

4 x In continuously.

100 x In for 1 sec.

2.16.3.2 DIGITAL INPUTS

Voltage Level:

Recognition Time:

300 Vdc maximum for HI power supply

75 Vdc maximum for LO power supply

< 4 ms

GEK-106237P MIFII Digital Feeder Relay 2-27

2 PRODUCT DESCRIPTION 2.16 TECHNICAL SPECIFICATIONS

2

2.16.4 POWER SUPPLY

2.16.5 OUTPUTS

2.16.4.1 LOW RANGE

Rated DC Voltage:

Min./Max. DC Voltage:

24 to 48 Vdc

19 / 58 Vdc

2.16.4.2 HIGH RANGE

Rated DC Voltage:

Min./Max. DC Voltage:

Rated AC Voltage:

Min./Max. AV Voltage:

110 to 250 Vdc

88 / 300 Vdc

110 to 230 Vac @ 50 – 60 Hz

88 / 264 Vac @ 50 – 60 Hz
Power Consumption: Max. = 10 W
Proper backup time (date, time and log

memory) without power supply voltage

> 1 week

2.16.5.1 OUTPUT RELAYS

Configuration: 6 Electro-Mechanical Form C

Contact Material: Silver alloy suited for inductive loads

Maximum Operating Voltage: 400 Vac

Single Contact Carry Continuous: 10 A at 250 Vac. general purpose

¾ HP, 124 Vac

1-1/2 HP, 250 Vac

10A, 250 Vac, 0.4 PF,

B300 pilot duty

Make and Carry: 30 A

Breaking: 4000 VA

2-28 MIFII Digital Feeder Relay GEK-106237P

2.16 TECHNICAL SPECIFICATIONS 2 PRODUCT DESCRIPTION

Max. Ratings for 100.000 operations:

2.16.6 COMMUNICATIONS

2.16.7 ENVIRONMENTAL

2.16.8 TYPE TESTS AND CERTIFICATIONS

The MIFII system complies with the following standards, which include the standards required by Community Directive 89/
336 for the CE marking, in line with European standards. It also complies with the European directive requirements for low
voltage, and the environmental and operating requirements established in ANSI standards C37.90, IEC 255-5, IEC 255-6
and IEC 68.PRODUCTION TESTS

VOLTAGE

MAKE&CARRY

CONTINUOUS

MAKE&CARRY 0.2 SEC BREAK MAX LOAD

DC Resistive

24 Vdc 10 A 48 A 10 A 384W

48 Vdc 10 A 48 A 2.6 A 125W

125 Vdc 10 A 48 A 0.6 A 75 W

250 Vdc 10 A 48 A 0.5 A 125 W

AC Resistive

120 Vac 10 A 48 A 10 A 1920 VA

250 Vac 10 A 48 A 10 A 4000 VA

AC Inductive PF = 0.4

250 Vac 10 A 30 A 10 A 1000 VA

FRONT PORT RS232 300, 600, 1200, 2400, 4800, 9600 or 19200 bps,

Modbus® RTU

REAR PORT RS485 300, 600, 1200, 2400, 4800, 9600 or 19200 bps,

Modbus® RTU

9600 or 19200
IEC60870-5-103

Operating Temperatures: -20º C to +60º C
Ambient Storage Temperatures: -40º C to +80º C
Maximum relative humidity 95%
Altitude 2000 m. Max
Pollution Degree 2

STANDARD DESCRIPTION CLASS
ELECTROSTATIC COMPATIBILITY AND INSULATION

IEC 60255-25 / EN 61000-6-4 (2001) Conducted and Radiated Emission

ENV 50204 (1995) Radiated Electromagnetic Fields with

Frequency Modulation

10 V/m, 900 MHz

IEC 60255-22-2 / EN 61000-6-2 (2001) Electrostatic Discharge Immunity Test Level 4 CM (8 kV). Level 3 AM (8 kV)

IEC 60255-22-3 / EN 61000-6-2 (2001) /
ENV 50204 (1995)

Radiated RF Fields Immunity Test Level 3 (10 V/m), 80-1000 MHz.

GEK-106237P MIFII Digital Feeder Relay 2-29

2 PRODUCT DESCRIPTION 2.16 TECHNICAL SPECIFICATIONS

2

IEC 60255-22-4 Electrical Fast Transient Immunity Test Level 3 (±2 kV except for communications

terminals RS-485 and RS-232 where the
level was ±1 kV) with a perfomance criteria
A.

IEC 60255-22-5 / EN 61000-6-2 (2001) Surge Immunity Test Level 3 (±2kV CM, ±1kV DM)

IEC 60255-21-6 / EN 61000-6-2 (2001) Injected RF Signals Immunity Test Level 3 (10 V/m), 0.15 – 80 MHz.

IIEC 60255-11 / EN 61000-6-2 (2001) Voltage Dips and Interruptions Immunity

Te st s

Duration and Voltage described in the
related report.

IEC 60255-22-1 (1988) 1 MHz Burst Disturbance Test Level 3 (±2.5 kV in common mode and ± 1

kV in differential mode) in the I/O terminals
specified in paragraph 4.2 of the
corresponding report.

IEC 61000-4-8 (1993) / IEC 61000-4-8
(1993)

50 Hz Magnetic Fields Immunity Test Level 5 (100 A/m for continuous applications

and 1000 A/m for transient applications) with
a performance criteria A.

IEC 60255-5 (1977) Measurement of Insulation Resistance In the paragraph relating to insulation

resistance for all groups defined in
paragraph 4 of the report.

IEC 60255-5 (1977) Impulse Voltage Test In the paragraph relating to impulse voltage

test for ±5 kV applicatios in common mode
and ± 1 kV in differential mode (class III) for
all the groups defined in paragraph 4 of the
correspond report.

IEC 60255-5 (1977) Dielectric Test In the paragraph relating to dielectric test for

2 kV, 50 Hz applications for all the groups
defined in paragraph 4 of the correspond
report.

2-30 MIFII Digital Feeder Relay GEK-106237P

2.16 TECHNICAL SPECIFICATIONS 2 PRODUCT DESCRIPTION

2.16.9 PRODUCTION TESTS

2.16.10 APPROVALS

Manufactured under an ISO9001 Registered system

Conforms to CE Marking

UL listed

STANDARD DESCRIPTION CLASS
CLIMATIC TESTS

IEC 60068-2-1 (1990) + A1 (1992) + A2
(1994)

Test A d Co l d

IEC 60068-2-2 (1974) + A1 (1993) + A2
(1994)

Test Bd Dry Heat

MAKE AND CARRY

ANSI C37-90:1990 Make and Carry

VIBRATION, SHOCK AND BUMPS

IEC 60255-21-1 (1998) Sinusoidal vibration / Vibration endurance

Te st

Class I

IEC 60255-21-2 (1998) Shock response / Shock strength / Bumps

Te st

Class I

VIBRATION

EN 60255-21-3 (1996) Seismic Test

Insulation Test: IEC255-5 (Tested on CTs, Power Supply terminals, Contact

Inputs and Contact Outputs)

GEK-106237P MIFII Digital Feeder Relay 3-1

3 HARDWARE 3.1 DESCRIPTION

3

3 HARDWARE 3.1DESCRIPTION

WARNING

MIFII Units are made up of different modules, such as:

CPU, which includes the power supply, inputs and outputs.
Magnetic module with 4 current transformers(3 for phases and 1 for ground)
Front module with 16x2 LCD display. It also includes the front RS232 communication port.

Figure 3–1: MIFII FRONT VIEW

3.1.1 MECHANICAL DESCRIPTION

The metallic case of the unit is highly resistant to corrosion. It is made of stainless steel (AISI 304), coated with an epoxy
layer, and the rest of the metallic pieces are covered with a high quality resistive coating that has successfully passed at
least 96 hours in the salt spray chamber (S/N ASTM B-117).

The front of the relay is made of a shielded high quality thermoplastic, flame retardant (V0), highly resistive material, which
guarantees the unit’s immunity to all types of EMI/RFI/ESD interference. As well, an IP52 (IEC 529) protection degree
against dust and water through the front and with the relay mounted in the panel.

The modular design of the relay simplifies repair or replacement of its components, without the need to manipulate the
wiring. These types of operations must be performed exclusively by qualified personnel and only after removing auxiliary
voltage from the unit.

The MIFII system incorporates electronic components that might be affected by electrostatic discharge currents
flowing through certain component terminals. The main source of electrostatic discharges is human body,
especially under low humidity conditions, with carpet flo ors or isolating shoes. If such con ditions are present
special care should be taken while manipulating MIFII modules. Operators, before even touching any
components, must make sure that their bodies are not charged by either touching a grounded surface or by
using an antistatic grounded wrist bracelet.

3-2 MIFII Digital Feeder Relay GEK-106237P

3.1 DESCRIPTION 3 HARDWARE

3.1.2 MOUNTING

The unit is designed for semi-flush mounting. The relay is secured to the panel with the 4 M6 screws provided with the unit.
This allows the user access to the front keypad, display and communication port. The wiring is at the rear of the unit. The
drilling dimensions are shown on the drilling dimension diagram.

Note: Dimensions are shown in inches (mm).

Figure 3–2: MOUNTING AND DIMENSIONS DRAWING FOR MIFII MODELS WITH DEPTH REDUCING COLLAR

GEK-106237P MIFII Digital Feeder Relay 3-3

3 HARDWARE 3.1 DESCRIPTION

3

3.1.3 REAR DESCRIPTION

The relay is wired through the terminal blocks located at the rear of the unit. In this terminal board, current terminals are
shorted two-by-two when the transformer module is extracted, so that the CT secondary never remains open.

Figure 3–3: REAR VIEW

The magnetic module with the CTs is already connected to a female connector screwed to the case that incorporates
shorting bars in the current inputs, so that it can be extracted without the need to short-circuit the current externally.

A grounded antistatic wristband must be used when manipulating the module in order to avoid electrostatic discharges that
may cause damage to the electronic components.

In a similar way, when mounting and dismounting the front of the unit, be sure to correctly align the DIN connector of the
rear bus with the DIN connectors of the module. A slow and careful insertion must be made until the module is correctly
aligned, and then a more firm insertion can be applied, never forcing the module.

3-4 MIFII Digital Feeder Relay GEK-106237P

3.1 DESCRIPTION 3 HARDWARE

3.1.4 TYPICAL WIRING DIAGRAM

Recommended cable section: 12/16 AWG.

Copper conductor only.

Tightening torque: 1.2 Nm.

Figure 3–4: TYPICAL WIRING DIAGRAM FOR MIFII RELAY WITHOUT RECLOSER

GEK-106237P MIFII Digital Feeder Relay 3-5

3 HARDWARE 3.1 DESCRIPTION

3

Figure 3–5: TYPICAL WIRING DIAGRAM FOR MIFII RELAY WITH RECLOSER

3-6 MIFII Digital Feeder Relay GEK-106237P

3.1 DESCRIPTION 3 HARDWARE

3.1.5 CONTROL POWER

CAUTION: CONTROL POWER SUPPLIED TO THE RELAY MUST MATCH THE RATED VOLTAGE OF THE RELAY. IF

THE VOLTAGE IS APPLIED TO THE WRONG TERMINALS, DAMAGE MAY OCCUR.

RANGE RATED VOLTAGE OPERATION RANGE

LO 24/48 Vdc 19.2~57.6 Vdc

HI 110/250 Vdc

110/230 Vac

88~300 Vdc
88~264 Vac

GEK-106237P MIFII Digital Feeder Relay 3-7

3 HARDWARE 3.1 DESCRIPTION

3

3.1.6 AC CURRENT TRANSFORMER INPUTS

Each AC current input has an isolating transformer and an automatic mechanism that shorts the input when the module is
withdrawn from the chassis. There are no internal ground connections on the current inputs. Current transformers with 1 A
or 5 A rated secondary current may be used.

CAUTION: VERIFY THAT YOUR RELAY MODEL CORRESPONDS TO YOUR RATED SECONDARY CURRENT.

UNMATCHED CTS MAY RESULT IN EQUIPMENT DAMAGE OR INADEQUATE PROTECTION.

The exact placement of a zero sequence CT, so that ground fault current will be detected, is shown below. Twisted pair
cabling on the zero sequence CT is recommended.

Figure 3–6: ZERO SEQUENCE CORE BALANCE CT INSTALLATION

3-8 MIFII Digital Feeder Relay GEK-106237P

3.1 DESCRIPTION 3 HARDWARE

3.1.7 CONTACT INPUTS / OUTPUTS

Figure 3–7: CONTACT INPUTS CONNECTIONS

Wet contacts must be connected to the inputs of the relay. A wet contact has one side connected to the positive terminal of
an external DC power supply. The other side of this contact is connected to the required contact input terminal (A8 or A9).
In addition, the negative side of the external source must be connected to the relay common (negative) terminal (A10). The
maximum external voltage source voltage for this arrangement is 300 Vdc for HI models and 57.6 for LO models.

The voltage threshold at which an input will detect a closed contact input depends on the relay model. For low voltage
range relays (LO model), the threshold is set to 12 Vdc. For high voltage range relays (HI model), the voltage threshold is
75 Vdc.

In case of using AC voltage, it must be ensured that there is no voltage (less than 10 Vac) between the input common
terminal, A10, and the ground terminal. The AC system must be line/neutral type, and not line/line, ensuring that the neutral
and ground do not differ in more than 10 Vac. The reason for this is that there might be enough current circulating through
the EMC filtering capacitors on these inputs to cause undesired activation.

If it is not possible to ensure the previous conditions, the connection shown below can be used, where lines are wired only
to inputs (A8 and A9), and the common (A10) is connected to the unit ground terminal.

Figure 3–8: CONTACT INPUTS CONNECTIONS (AC ACTIVATION)

GEK-106237P MIFII Digital Feeder Relay 3-9

3 HARDWARE 3.1 DESCRIPTION

3

3.1.8 OUTPUT CONTACTS CONFIGURATION

All output relays are form C relays. Only one of the two states of the form C relay is connected to the MIFII output terminal.
For each output relay it is possible to select which state is preferred to have at the MIFII terminals, NC (normally closed) or
NO (normally open).

Next figure shows the PCB of a MIFII relay, and the location of the jumpers used to select the configuration of each output
contact (NO or NC).

Figure 3–9: PCB SCHEME SHOWING THE JUMPERS TO CONFIGURE THE OUTPUT CONTACTS (NC / NO)

3-10 MIFII Digital Feeder Relay GEK-106237P

3.1 DESCRIPTION 3 HARDWARE

3.1.9 OUTPUTS ISOLATION

MII relays provide one trip contact, one alarm contact and four configurable contacts (option 1 and 2) sharing one common.

An internal jumper, called Jx jumper, has been provided to allow splitting the four configurable outputs into two isolated
groups. In this case, the number of outputs is reduced to three.

Jx jumper is closed in the factory default configuration. (It is possible to order relays with Jx removed).

The figure shows the factory default configuration with Jx Jumper closed. It is located on the soldering part of the PCB
containing the inputs and outputs.

Figure 3–10: JX JUMPER

The Jx jumper is a tin-solder jumper easy to remove using a de-soldering tool.

The standard factory default output contact configuration consists of one group of four outputs, with the same common. The
figure below shows the configuration:

GEK-106237P MIFII Digital Feeder Relay 3-11

3 HARDWARE 3.1 DESCRIPTION

3

Each output has a different configuration, and it is able to operate independently to the others.

If Jx jumper is removed, the output contact configuration change as shown in the following figure:

After removing the Jx Jumper, the outputs are divided in two groups: Independent and isolated.

Group1: Terminals B8-B7: Provide one output contact combining OUT1 and OUT2
Group 2: Terminals B9-A7: OUT3 Standard output contact

Terminals B10-A7: OUT4 Standard output contact

3.1.9.1 OUTPUT CONFIGURATION AT TERMINALS B8-B7:

To have a closed contact across terminals B7-B8, one of the two following procedures should be followed:

a) JX REMOVED AND OUT1 AND OUT2 NORMALLY OPEN:

OUT1 and OUT2 must operate together to operate like a single output.

The configuration of OUT1 and OUT2 must be the same so both outputs close simultaneously and operate successfully.

Figure 3–11: OUT1 AND OUT2 CONFIGURATION TO ACT AS A NORMALLY OPEN CONTACT

3-12 MIFII Digital Feeder Relay GEK-106237P

3.1 DESCRIPTION 3 HARDWARE

b) JX REMOVED AND ONE OF THE TWO INTERNAL CONTACTS SET AS NORMALLY CLOSED:

It is possible to change by hardware the contact configuration from normally open to normally closed (see the first point of

this document).

c) OUT1 NORMALLY CLOSED AND OUT2 NORMALLY OPEN:

The hardware configuration corresponds to OUT1 NC and OUT2 NO. To operate with this hardware configuration it is
necessary to configure by software the OUT1 as NOT ASSIGNED, so it never change its state and remains closed, and
OUT2 as required by the application (output configuration is only available in models option 1 and 2).

d) OUT1 NORMALLY OPEN AND OUT2 NORMALLY CLOSED:

The hardware configuration corresponds to OUT1 NO and OUT2 NC. To operate with this hardware configuration it is
necessary to configure by software the OUT2 as NOT ASSIGNED, so it never change its state and remains closed, and
OUT1 as required by the application (output configuration is only available in models option 1 and 2).

GEK-106237P MIFII Digital Feeder Relay 3-13

3 HARDWARE 3.1 DESCRIPTION

3

3.1.10 RS232 FRONT COMMUNICATIONS PORT

A 9-pin RS232C serial port is located on the front of the relay for programming with a portable (personal) computer. All that
is required to use this interface is a personal computer running the EnerVista MII SETUP software. Next figure shows the
communications cable configuration.

Figure 3–12: RS232 FRONT PORT CONNECTION

WARNING: IN ORDER TO PREVENT DAMAGE BOTH TO THE PC SERIAL COMMUNICATIONS PORT AND THE
RELA Y FRONT RS232 PORT, IT IS COMPULSORY TO CONNECT THE RELA Y GROUND TO THE SAME GROUND AS
THE PC. OTHERWISE, USE AN UNGROUNDED COMPUTER.

FOR THIS PURPOSE, PLEASE FOLLOW THE SAFETY INSTRUCTIONS IN CHAPTER 1

3-14 MIFII Digital Feeder Relay GEK-106237P

3.1 DESCRIPTION 3 HARDWARE

3.1.11 RS485 COMMUNICATIONS PORT

In addition to the front RS232 port, the relay provides the user with an additional RS485 communication port. RS485 data
transmission and reception are accomplished over a single twisted pair that transmit and receive data alternating over the
same two wires. Through the use of these port, continuous monitoring and control from a remote computer, SCADA system
or PLC is possible.

To minimize errors from noise, the use of shielded twisted pair wire is recommended. For a correct operation, polarity must
be respected, although if it is not, there is no danger to damage the unit. For instance, the relays must be connected with all
RS485 SDA terminals connected together, and all SDB terminals connected together. The RS485 standard refers only to
terminals named “A” and “B”, although many devices use terminals named “+” and “-“. As a general rule, terminals “A”
should be connected to terminals “-“, and terminals “B” to “+”. There are exceptions to this rule, such as the GE ALPS and
DDS family of relays. The GND terminal should be connected to the common wire inside the shield, when provided.
Otherwise, it should be connected to the shield. To avoid loop currents, the shield should be grounded at one point only.
Each relay should also be daisy chained to the next one in the link. A maximum of 32 relays can be connected in this
manner without exceeding driver capability. For larger systems, additional serial channels must be added. It is also possible
to use commercially available repeaters to increase the number of relays on a single channel to more than 32. Do not use
other connection configurations different than the recommended.

Lightning strikes and ground surge currents can cause large momentary voltage differences between remote ends of the
communication link. For this reason, surge protection devices are provided internally. To ensure maximum reliability, all
equipment should have similar transient protection devices installed.

Figure 3–13: RS485 SERIAL CONNECTION (B6366H5)

GEK-106237P MIFII Digital Feeder Relay 4-1

4 COMMUNICATIONS 4.1 ENERVISTA MII SETUP SOFTWARE

4

4 COMMUNICATIONS 4.1ENERVISTA MII SETUP SOFTWARE 4.1.1 OVERVIEW

IMPORTANT NOTE: MII FAMILY RELAYS CAN BE USED ONLY WITH ENERVISTA MII SETUP SOFTWARE.

The EnerVista MII SETUP software package uses only ModBus protocols, and is designed to communicate with a single
relay at a time. GE Multilin offers different communication software packages, such as GE-POWER and ENERVISTA,
which can be used to communicate simultaneously with several relays.

EnerVista MII SETUP software provides an easy way to configure, monitor and manage all MIFII features.

a) Setting files

EnerVista MII SETUP software provides two ways of working with setting files:

1.In off-line mode, disconnected from the relay, creating or editing setting files for a future download to the relay.

2.Modifying directly the relay settings while connected to the relay.

b) Configuration

The configuration of inputs, outputs and LEDs can be modified, and internal logics with the different relay elements can

be created. For MIFII, it depends on the selected option (OPTION 0, 1 or 2)

c) All metering values used by the unit can be monitored, as well as the internal states, inputs and outputs status.

d) Performing the different available operations.

e) Firmware updates.

f) Viewing the different records stored in the relay, as events, oscillography, etc.

The simplified use of the EnerVista MII SETUP software is as follows:

Execute

ENERVISTA MII SETUP

Send the settings to

the relay

Open *.ajs (settings) file

Modify the settings of

the relay

Save the settings

Connect to the relay

4-2 MIFII Digital Feeder Relay GEK-106237P

4.1 ENERVISTA MII SETUP SOFTWARE 4 COMMUNICATIONS

4.1.2 STARTING COMMUNICATION

Before the physical connection to the relay, it is important that the user reviews the safety instructions detailed in section 1.
This section explains the importance of connecting both relay ground terminal and computer to a good grounding.
Otherwise, communication may not be possible, or the relay and/or the computer could be damaged.

To work online, the relay communication parameters (e.g. baud rate, relay address and password) must match the
parameters in the computer.

The computer parameters can be modified, in the Communication – Computer menu. Refer to the appropriate section in
this same chapter for more details.

4.1.3 MAIN SCREEN

The main screen of EnerVista MII SETUP software includes the following components:

• Title

• Main menu bar

• Main icon bar

• Working area

• Status bar

Figure 4–1: ENERVISTA MII SETUP MAIN SCREEN

GEK-106237P MIFII Digital Feeder Relay 4-3

4 COMMUNICATIONS 4.2 FILE

4

4.2FILE 4.2.1 NEW

From the File – New option, the user can create a new file that will contain all the protection unit settings, as well as the

relay configuration (inputs, outputs, events, oscillography, etc.).

When the option is selected, the following screen will be shown. The user must select here a specific relay model matching
exactly the relay model to which the settings and configuration will later be downloaded. The mentioned settings and
configuration are related to the default factory settings of the relay

The Model Selection window will show only some basic models and those for which the MIIPC software has ever been
connected. In case the relay has been connected to different firmware version of the same model, a version selection
window will appear to choose the correct one.

.

Figure 4–2: MODEL SELECTION

Once the relay model is selected, the software will load the relay structure and will enable the Setpoint, Actual,
Communication, View and Help menus for configuration.

4.2.2 OPEN

Option that allows to open previously created setting files for their modification.

Once the relay model is selected, the program will enable Setpoint, Actual, Communication, View and Help sub-menus.

4-4 MIFII Digital Feeder Relay GEK-106237P

4.2 FILE 4 COMMUNICATIONS

4.2.3 SETTINGS FILE CONVERTER

The Settings File converter allows the user to convert former versions setting files to another one.

When the option is selected, a .ajs file chooser will be shown, to select the settings source file. After selecting it, a model
selection window will appear for choosing the version of the new file. Please, note that the Relay I/O configuration an the
Logic configuration won't be converted.

Figure 4–3: WARNING POP-UP

Finally, the settings will be charged on the Enervista MII Setup on offline mode, so it must be saved in order to get the new
.ajs file.

4.2.4 PROPERTIES

From the File – Properties option, the program will show a screen including the relay model information, firmware version,

etc., as shown on Figure 4–4:

Figure 4–4: MODEL/VERSION

GEK-106237P MIFII Digital Feeder Relay 4-5

4 COMMUNICATIONS 4.2 FILE

4

4.2.5 GET INFO FROM RELAY

The File – Get info from relay option enables the user to save the relay settings in a file on the hard disk of the computer.

This file can later be opened offline to review and modify settings, and send them again to the relay after the modifications.

4.2.6 SEND INFO TO RELAY

The File – Send info to relay option enables to send to the relay a settings file stored on the hard disk of the computer.

Please, note that only files matching the version of the relay's firmware will be acceptable for being sent to the relay. In
other case, an error message will be shown, asking the user to convert the file using the Setting File Converter application
included in this software.

4.2.7 PRINT SETUP

The File – Print Setup option enables the user to configure the print setup for the settings file as shown in Figure 4–5:

Figure 4–5: PRINTER SETUP

4.2.8 PRINT PREVIEW

The File – Print Preview option displays a preview of the settings print-out. It is also provides a quick view of all the relay

settings at a glance, without having to navigate through the different menu trees. From this screen it is also possible to
configure the printer that will be used, or to directly print the document. Double clicking on the document with the left mouse
button will enlarge the document view, and double clicking with the right button will reduce the size.

4-6 MIFII Digital Feeder Relay GEK-106237P

4.2 FILE 4 COMMUNICATIONS

The available actions in this screen are shown in Figure 4–6:

Figure 4–6: PRINT PREVIEW CONTROLS

4.2.9 PRINT

The File – Print option prints the relay settings using Windows default (active) printer.

4.2.10 CLOSE

The File – Close option exits the program. It does not prompt for confirmation or save the open file.

GEK-106237P MIFII Digital Feeder Relay 4-7

4 COMMUNICATIONS 4.3 SETPOINT

4

4.3SETPOINT

Clicking on the Setpoint menu entry gives access to Settings, Configuration, Logic Configuration and Clock.

4.3.1 SETTINGS

The Settings sub-menu is the same for all MII family relays, and shows all relay settings divided in two groups: Main
Settings and Advanced Settings. The first settings group has basic settings (main protection functions). The second

settings group includes more advanced settings (double settings group, customized curves, etc.), needed only if more
complex protection schemes are required

The purpose of this division is to simplify the use of the relay for those users only requiring the basic functionality of the
relay.

Figure 4–7: SETTINGS MENU

Once in the corresponding sub-menu, either Main Settings or Advanced Settings, the procedure to enter and modify any
setting value is the same:

Select the settings group (the function selected in the example is the51P function in a MIFII).

Edit the setting double-clicking on the value (for example, 51Penable).

Modify the value of the setting (see Figure 4–9: to Figure 4–11:).

Confirm/Accept the modified value.

Store the settings in the relay (if working in Emulation mode, this option stores them on a temporay file that must be saved
with the File->Save option

in order to preserve them) with the Store button. If the OK button is pressed without having

pressed Store (a window asking confirmation will appear), the settings of this group will be discarded.

Figure 4–8: FUNCTION MENU

4-8 MIFII Digital Feeder Relay GEK-106237P

4.3 SETPOINT 4 COMMUNICATIONS

Primarily there are four different setting formats:

Boolean/Logic Settings (only two choices). For Boolean settings, the two possible options are shown so as the

user can select which one is the appropriate, clicking with the mouse on the option
desired.

Numerical Settings For Numerical settings, a number must be entered. The program shows the minimum

and maximum value for each setting, and it will not accept any value out of the
corresponding range.

Settings with a set of options For set of options settings, a pop-up window is shown, containing all possible values.

Select the appropriate one clicking on it.

Text Setting A text box is shown.

Figure 4–9: LOGIC SETTING. Figure 4–10: NUMERIC SETTING. Figure 4–11: SET OF OPTIONS.

4.3.2 MAIN SETTINGS

4.3.2.1 GENERAL SETTINGS

General settings describe and activate the electric system settings where the relay is going to operate. Some of these
settings will be used with measure values presentation purposes; however, some of them are directly applied during the
sampling and analogical-numerical conversion process (nominal frequency setting). Therefore, these settings need to be
altered so they fit with the system settings.

4.3.2.2 GROUP 1- GROUP 2 FUNCTION SETTINGS

The M family relays provide two independent setting groups. Group 1 is available in the Main Settings group, while Group
2 can be accessed in the Advanced Settings group. The setting groups can be selected by digital input, through a

communications command or from the EnerVista MII SETUP, or simply selecting it with the relay keypad. The setting that
shows the active group can be found in General Advanced Settings.

4.3.3 ADVANCED SETTINGS

4.3.3.1 ADVANCED GENERAL SETTINGS

Advanced General Settings enables configuration of the active setting group as well as the minimum time the trip contact

will remain closed, to let the circuit breaker open the circuit so as the contact does not get burnt.

4.3.3.2 OTHER ADVANCED SETTINGS

Besides the Flex Curve values, the user may configure the mask of events that will generate an event report and the events
that will generate an oscillography.

GEK-106237P MIFII Digital Feeder Relay 4-9

4 COMMUNICATIONS 4.3 SETPOINT

4

4.3.4 RELAY CONFIGURATION

Setpoint – Relay Configuration shows a dialog box to configure digital inputs, contact outputs and front panel LEDs, as

shown in Figure 4–12:

Figure 4–12: RELAY CONFIGURATION SETTINGS

Each input, output and LED can be assigned an individual function (status bit) or an OR of a group of functions. Functions
can also be assigned to virtual inputs and outputs, in order to allow greater flexibility when creating complex logics.

The meaning of the different columns is explained below

:

• INPUT/LED/OUTPUT: Designates the respective element

• I/O configuration: the appearance and function of this column can be, depending on the state of the respective OR

checkbox column:

- OR checkbox is not checked: the element consists of a drop down list in which the user can select the function that

will activate the output or LED, or that will be activated by the input

- OR checkbox is checked: the element consists of a button that will activate a new window (see Figure 4–13:)

where the user can choose a sum of several functions that will activate the output or LED, or be activated by the
input. These functions are distributed in groups, and only functions in the same group can be chosen for the same
OR gate.

• OR: activates the OR button for the I/O configuration column (see previous point). The window that appears when the

OR button is pressed can be seen in Figure 4–13:

4-10 MIFII Digital Feeder Relay GEK-106237P

4.3 SETPOINT 4 COMMUNICATIONS

Figure 4–13: OR ASSIGNMENT

• NOT: when NOT checkbox is enabled, the logic is inverted. The element (input, output, LED) will actuate when the

conditions are NOT fulfilled.

• NAME: the user can write an identifying label of up to 4 characters that will get stored to be displayed later on.

• BLINK (only for LEDs): the selection of BLINK checkbox makes the LED blink (alternatively switch ON and OFF)

instead of being fixed when it is activated.

• MEMORY (only for outputs and LEDs): when MEMORY checkbox is enabled, the respective element will be latched. If

the cause that generated the activation of the output or LED does no longer exist, the element will remain active until a
RESET command is performed.

GEK-106237P MIFII Digital Feeder Relay 4-11

4 COMMUNICATIONS 4.3 SETPOINT

4

4.3.5 LOGIC CONFIGURATION

MII family relays can execute simple logic schemes that can be programmed from EnerVista MII SETUP. This logic

schemes can be found at Setpoint – Logic Configuration.

When one of the logics is selected, a new window will appear where the user can assign up to 8 inputs to the logic circuit.
Each of these inputs can be a single function or status, as well as a logical union of several statuses

Figure 4–14: LOGIC CONFIGURATION

The way the logic works is illustrated in the diagram at the right of the logic window.

First, depending on the gate, up to 2 or 3 signals (internal flags coming from the status of the relay or from another logic, or

external input signals) can be chosen as sources of each AND gate. The way they are programmed is similar to the way I/

Os are (refer to relay configuration). The device will not take into account entries that are after an empty one. This means

that every entry after the first empty one will be ignored. For example, if L1 IN1 is programmed but L1 IN2 is left empty, the
relay will not take into account L1 IN3 and will directly evaluate L1 IN4. In the same way, the relay will ignore AND2 if AND1
is not programmed, and will ignore AND3 if AND1 or AND2 are not programmed.

Then the results from the AND gates are added by an OR gate that will produce the result of the logic.
It is possible to set the pickup and dropout times for ou tput from the OR gate. Example: for picking time of 10s and a

dropout time of 15s, if input of the OR gate changes to 1, this input has to remain for 10s before the result of the logic
changes to 1. If result of the OR gate drops to 0, output will be 1 for 15s and after that time output will be 0.

See Chapter 7 for more details on logic configuration.

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4.3 SETPOINT 4 COMMUNICATIONS

4.3.6 DATE /TIME

The change date/time option opens a window with two choices:

• Sending the PC date and time to the unit, this is, synchronizing the PC and the unit.

• Selecting a date and a time and sending it to the relay.

Figure 4–15: CHANGE DATE/TIME

Once the new date and time have been sent, the user can check in the status graph, or even in the relay itself, that the new
date/time has been correctly entered.

GEK-106237P MIFII Digital Feeder Relay 4-13

4 COMMUNICATIONS 4.4 ACTUAL

4

4.4ACTUAL 4.4.1 ACTUAL VALUES

Actual - Actual values menu displays the Status Window shown in Figure 4–16:. This window shows internal relay

information, measures, function status as well as additional information. There is a vertical scroll bar to navigate up and
down the table to reach the desired information:

• Relay model number and firmware version.

• Relay internal date and time.

• Values of currents, voltages and powers (phase and ground).

• Protection function status (pickup / trip for each function).

• Active settings group number.

• Contact inputs and outputs status, and LEDs status.

• Information from the self-test functions of the device.

Figure 4–16: STATUS WINDOW

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4.4 ACTUAL 4 COMMUNICATIONS

4.4.2 EVENT RECORDER

Actual – Event Recorder option makes the last 24 relay events to be retrieved (up to 32 for MIFII) and displayed in the

window appearing in Figure 4–17:. Each event record is labeled with date, time (with 1msec. resolution), the cause of the
event (pickup, trip of a certain function, etc.), and a list of the status of all inputs, outputs and functions during the event.
Additionally, the program also shows current and voltage values for all phases and ground, frequency and single line
sequence voltage during the event.

Figure 4–17: EVENTS WINDOW

The retrieved events can be reviewed in this window or also saved to disk (to be opened with EnerVista MII SETUP
program) or exported to CSV (Comma Separated Values) format. This is a standard text table format that can be opened
with most commercially available database or spreadsheet programs such as MS Access or Excel.

GEK-106237P MIFII Digital Feeder Relay 4-15

4 COMMUNICATIONS 4.4 ACTUAL

4

4.4.3 WAVEFORM CAPTURE

In the Actual - WAVEFORM CAPTURE option, the user can start the process to retrieve the Oscillography record stored in

the relay. The program will request the path and filename where the file is to be stored, by means of the following form:

Figure 4–18: OSCILLOGRAPHY RECORD

This file can be viewed using GE_OSC software (the use of this software is described in manual GEK-105596).

4-16 MIFII Digital Feeder Relay GEK-106237P

4.5 OPERATIONS 4 COMMUNICATIONS

4.5OPERATIONS

From Operations menu the user can perform all possible operation commands.

Figure 4–19: OPERATIONS MENU

GEK-106237P MIFII Digital Feeder Relay 4-17

4 COMMUNICATIONS 4.6 COMMUNICATION

4

4.6COMMUNICATION

The COMMUNICATION menu provides configuration options to communicate with the relay, as well as to perform a

ModBus communication troubleshooting, or to update the relay with a new firmware.

After making any change, pressing Store button saves the changes without exiting the window. Pressing OK saves and
exits and pressing Cancel exits without saving changes.

4.6.1 COMPUTER

In COMPUTER dialog the user can configure the necessary adjustments to communicate with the relay from a PC.

Figure 4–20: COMMUNICATIONS DIALOG

4-18 MIFII Digital Feeder Relay GEK-106237P

4.6 COMMUNICATION 4 COMMUNICATIONS

4.6.1.1 COMPUTER SETTINGS

In COMPUTER SETTINGS box the user can configure computer communication settings, besides the connection (Control

Type) and Startup Mode.

Control Type defines the connection type that is going to be used:

• No control type for serial connection (front RS232 or rear RS485),

• ModBus/TCP for Ethernet connection (by means of a serial/TCP converter). When this option is chosen, the serial

configuration data disappears and a new box appears at the right to configure the IP address, the port number and the
unit id.

Figure 4–21: MODBUS/TCP SETUP

• MODEM CONNECTION for modem serial connection. The modem configuration options appear at the right when this

option is chosen.

Defaults button returns the values to the factory default ones.

4.6.1.2 COMMUNICATION CONTROL

In COMMUNICATIONS CONTROL box the user can view the communication status (communicating to a relay or not),
connect to a relay when the right parameters are entered in the Computer Settings box (ON button), or disconnect from the
relay when desired (OFF button).

Once the connection is established, when the user accesses any Setpoint or Operations, or Actual – Event Recorderi menu
entries for the first time, the program will ask the relay password. The following window will appear:

Figure 4–22: COMMUNICATION CONTROL – COMMUNICATING

i. i.e., the first time a writing operation is performed against the relay during the current communication

GEK-106237P MIFII Digital Feeder Relay 4-19

4 COMMUNICATIONS 4.6 COMMUNICATION

4

4.6.1.3 COMMUNICATION OPTIMIZATION

COMMUNICATIONS OPTIMIZATION box allows the user to enter values to control device response to communication

attempts. Changing these parameters can improve communication, although it is recommended not to make changes to
the default values if it is not required.

Figure 4–23: COMMUNICATION OPTIMIZATION

4.6.1.4 PRINT SCREEN

When the Print Screen button is pressed, a new window appears asking if the user wants to capture the entire screen or
only the active window (the one with all the communication parameters). Yes means capturing the whole screen and No

means capturing only the communications window.

Then a new window appears allowing to view the captured screen, to save the captured file in BMP or JPG format, or to
print it (the print dialog window will appear so as the user can select which printer to use and enter the appropriate printer
settings).

Figure 4–24: PRINT SCREEN

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4.6 COMMUNICATION 4 COMMUNICATIONS

4.6.2 TROUBLESHOOTING

The TROUBLESHOOTING option is available only when the PC is communicating with a relay. It is intended to check the

ModBus communication frames between the PC and the relay. In the upper part, the user can read any readable value from
the relay (setpoints, actual values) by entering the desired hexadecimal address

i

, the type of data to read (Setpoints, Actual
Values), the number of registers (the length of each register is of 2 bytes) and the format of the data (integer, long, float...),
checking the checkbox at the left to make the PC start polling that address or unchecking it to stop.

In the lower part, data can be sent to writable addresses of the relay. The working is similar to reading but, to send the data,

the user must press the SEND button.

Figure 4–25: TROUBLESHOOTING

Refer to preceding section to learn about Print Screen button.

i.To check how to read memory map addresses from the relay refer to the corresponding section further in this chapter

GEK-106237P MIFII Digital Feeder Relay 4-21

4 COMMUNICATIONS 4.6 COMMUNICATION

4

4.6.3 UPGRADE FIRMWARE VERSION

IMPORTANT WARNING: For upgrading the relay firmware to version 4.00 or later, it is mandatory 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

The UPGRADE FIRMWARE VERSION option is active only when there is no active communication with the relay. If the PC
is communicating with the relay, the user must switch communication off in Communication > Computer menu to activate

this option.

When this option is selected, a window appears asking for the new firmware version file to be uploaded to the relay:

Figure 4–26: FLASH UPDATE FILE

After selecting the file that will be used to update the FLASH memory, the following screen will be displayed:

Figure 4–27: RELAY IDENTIFICATION

After introducing the Slave Address and Relay password (1 and 1 by default), the following screen will be displayed,
showing details of the old model and the new model:

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4.6 COMMUNICATION 4 COMMUNICATIONS

Figure 4–28: UPDATE FLASH DIFFERENCES

If the update is to a model option with higher functionality (see OPTION 1, OPTION 2 and OPTION R in the model list), the
program will request a password. This password can be obtained placing an order with GE Multilin. The following three
parameters must be clearly indicated in the order:

• Serial number of the unit.

• Current model option (before memory update).

• Desired model option (after memory update).

In a case where more than one unit needs to be updated, all the serial numbers must be detailed, and a different password
will be assigned for each unit.

GEK-106237P MIFII Digital Feeder Relay 4-23

4 COMMUNICATIONS 4.6 COMMUNICATION

4

Figure 4–29: PASSWORD

If the update does not require changes to the functionality of the relay, the program will not request a password.

After completing the previous screen, and during the loading process, the following screen will be displayed, showing the
update process status:

Figure 4–30: UPDATE PROCESS

During the update, the display and LEDs will blink until the total completion of the process. Then the following screen will
appear:

Figure 4–31: UPDATE COMPLETED

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4.6 COMMUNICATION 4 COMMUNICATIONS

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.

IMPORTANT NOTICE:

The MODBUS® memory map may change for different firmware versions. As a result, the Flash memory update, when
upgrading to a higher model (OPTION 1 or 2), may involve a MODBUS® memory map change. This may result a critical
issue when the relay is integrated in a system, and the user should take into account the modifications that will have to be
performed in the programs that access the MIFII relay memory maps.

Additionally, when a Flash memory update is performed, the loading program will enter the default setti ngs. This

means that the user will need to adapt the settings to the real situation of the protected device. If the user wants to keep the
same settings after the memory update, a copy of the settings should be stored in a file before starting the update process.

GEK-106237P MIFII Digital Feeder Relay 4-25

4 COMMUNICATIONS 4.7 VIEW

4

4.7VIEW 4.7.1 TRACES

TRACES option is only active when the PC is communicating with the relay. If the communication is not established, to

activate this option the user must switch communication on in Communication > Computer menu.
When TRACES are active, the ModBus communication traces will be displayed in the lower part of the screen, as shown in

Figure 4–32:

Figure 4–32: MODBUS TRACES

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4.7 VIEW 4 COMMUNICATIONS

4.7.2 MODBUS MEMORY MAP

MODBUS MEMORY MAP option is only active when the PC is communicating with the relay. If the communication is not

established, to activate this option the user must switch communication on in Communication > Computer menu.
With MODBUS MEMORY MAP option the user can extract the complete memory map from the relay and print or save it in

CSV format (to be later opened with any database or spreadsheet program as MS Excel). It is recommended to use this
feature as memory map changes with relay model and firmware version so this is the safest way of obtaining the
appropriate memory map for every single relay.

Figure 4–33: MODBUS MEMORY MAP

GEK-106237P MIFII Digital Feeder Relay 4-27

4 COMMUNICATIONS 4.7 VIEW

4

4.7.3 LANGUAGES

LANGUAGES option is only active when there is no active communication with the relay. If the PC is communicating with

the relay, to activate this option the user must switch communication off in Communication – Computer menu.

Figure 4–34: LANGUAGES

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4.7 VIEW 4 COMMUNICATIONS

GEK-106237P MIFII Digital Feeder Relay 5-1

5 SETTINGS 5.1 SETTINGS STRUCTURE

5

5 SETTINGS 5.1SETTINGS STRUCTURE

All the settings of the MIFII relay, together with the procedures to change their value, are described in this chapter. First of
all, a complete list of settings is shown; including ranges, units, step and factory default value. Then, the settings requiring
more detailed comments are individually explained. In the EnerVista MII SETUP program, the settings are grouped under
the Setpoint menu, Setpoint sub-menu entry.

The MIFII relay provides two settings groups (group 2 is accessible in the ADVANCED SETTINGS group), stored in

EEPROM memory (permanent memory). Using a setting or through a communications command(or through a digital input
in models with OPTION 1 or 2), it is possible to select which group is active, and then used by the relay protection

algorithms.

Settings can be accessed and modified either using the relay faceplate keypad, or using a computer connected to the relay
through any of the relay communications ports, and the EnerVista MII SETUP program. The use of the keypad to modify
settings is described in Chapter 8. If the computer is used to handle the settings, the following steps must be considered:

Make sure your communication cable matches the scheme shown in Figure 3–12:

Connect the communications cable between the relay (or modem) and the computer serial port.

Run the EnerVista MII SETUP program. The procedure to install and use the EnerVista MII SETUP program is described in
section 1.2.2 and in section 4.

Make sure that the communications parameters in the relay match the EnerVista MII SETUP configuration settings

(Communication - Computer Menu). The communications parameters shown in the relay faceplate display, within the

configuration menu are:

Comm Password
Comm Baud Rate
Slave Address

For instructions on how to check and modify EnerVista MII SETUP program communications parameters please refer to
chapter 4.

Check that the relay number and password in the MIFII display match the numbers entered in the dialog window of the
EnerVista MII SETUP, after clicking on Relay Connection.

CT ratio settings allow the user to view the current measures in primary values.

5-2 MIFII Digital Feeder Relay GEK-106237P

5.2 MAIN SETTINGS 5 SETTINGS

5.2MAIN SETTINGS 5.2.1 GENERAL SETTINGS

*Only available for option C models. For further information please see APPENDIX E

ENERVISTA MII SETUP HMI DEFAULT RANGE STEP

PRODUCT SETUP PRODUCT SETUP PRODUCT SETUP

Relay Status Relay Operation Relay Operation DISABLE READY / DISABLE NA

Frequency Frequency Frequency 60 Hz 50/60 Hz NA

ModBus Format --- ModBus Format Intel Intel/Motorola NA

Phase CT ratio Phase CT Ratio Phase CT Ratio 1 1-4000 1

Ground CT ratio Ground CT Ratio Ground CT Ratio 1 1-4000 1

HMI Password --- HMI Password 0 0-9999 1

Comm Password --- Comm Password 1 1 – 255 1

Slave Address --- Slave Address 1 1 – 255 1

Communication Baud rate --- Comm Baud Rate 9.6 0.3, 0.6, 1.2, 2.4, 4.8,

9.6, 19.2

NA

Communication 2 Baud
rate*

--- COM2 Baud rate 9.6 0.3,0.6,1.2,2.4,4.8,9.
6,19.2

NA

Prefault cycles* Prefault Cycles Prefault Cycles 50 10-140 1

GEK-106237P MIFII Digital Feeder Relay 5-3

5 SETTINGS 5.2 MAIN SETTINGS

5

5.2.2 PHASE / GROUND TOC SETTINGS (51P / 51G) (

PHASE / GROUND IOC SETTINGS (50P1 / 50P2 / 50G1/50G2) (

ENERVISTA MII SETUP HMI DEFAULT RANGE STEP

Phase TOC Function PHASE TOC 51P PHASE TOC 51P

51P Permission to Trip Trip Enable 51P Trip Enable 51P No Yes/No NA

51P Pickup Value Pickup 51P Pickup 51P 0.5 In (Phase) 0.1-2.4 In (Ph) 0.01 In (Ph)

51P Curve Type Curve 51P Curve 51P DEFINITE TIME DEFINITE TIME,

USER, MOD
INVERSE, VERY
INVERSE, EXTR
INVERSE, INVERSE
SHORT, INVERSE
LONG

NA

51P Time Dial TD mult 51P TD mult 51P 0.5 0.05 – 2.00

(IEC curves)

0.01

5 0.5 – 20.0

(ANSI curves)

0.01

0.5 0.5 – 10.0
(IAC curves)

0.01

51P Definite Time Delay Def Time 51P Def Time 51P 1.00 s. 0.00 – 600.00 s. 0.01 s.

Ground TOC Function GROUND TOC 51G GROUND TOC 51G

51G Permission to Trip Trip Enable 51G Trip Enable 51G No Yes/No NA

51G Pickup (for 1/5 A
ground)

Pickup 51G Pickup 51G 0.5 In (Ground) 0.10 – 2.40 In (Gnd) 0.01 In

(Gnd)

51G Pickup (for sensitive
ground)

Pickup 51G Pickup 51G 0.005 A 0.005-0.12 A 0.001 A

51G Curve Type Curve 51G Curve 51G DEFINITE TIME DEFINITE TIME,

USER, MOD
INVERSE, VERY
INVERSE, EXTR
INVERSE, INVERSE
SHORT, INVERSE
LONG

NA

51G Time Dial TD Mult 51G TD Mult 51G 0.5 0.05 – 2.00

(IEC curves)

0.01

5 0.5 – 20.0

(ANSI curves)

0.01

0.5 0.5 – 10.0
(IAC curves)

0.01

51G Definite Time Delay Def Time 51G Def Time 51G 1.00 s. 0 –600.00s. 0.01 s.

ENERVISTA MII SETUP HMI DEFAULT RANGE STEP

Phase IOC High Setting 50P1 Function Phase IOC 50P1

50P1 Permission to Trip 50P1 Trip Trip Enable 50P1 No Yes/No NA

50P1 Tap / Pickup 50P1 Pickup Pickup 50P1 1 In (Phase) 0.1 – 30.0 In (Ph) 0.1 In (Ph)

50P1 Time Delay 50P1 Time Delay Delay 50P1 0 s. 0 – 600.00 s. 0.01 s.

Phase IOC Low Setting 50P2 Function Phase IOC 50P2

50P2 Permission to Trip 50P2 Trip Trip Enable 50P2 No Yes/No NA

50P2 Tap / Pickup 50P2 Pickup Pickup 50P2 1 In (Phase) 0.1 – 30.0 In (Ph) 0.1 In (Ph)

50P2 Time Delay 50P2 Time Delay Delay 50P2 0 s. 0 – 600.00 s. 0.01 s.

Ground IOC High Set. 50G1 Function Ground IOC 50G1

50G1 Permission to Trip 50G1 Trip Trip Enable 50G1 No Yes/No NA

50G1 Tap / Pickup (for 1/5 A
ground)

50G1 Pickup Pickup 50G1 1 In (Ground) 0.1 – 30 In (Gnd) 0.1 In (G)

5-4 MIFII Digital Feeder Relay GEK-106237P

5.2 MAIN SETTINGS 5 SETTINGS

5.2.3 THERMAL IMAGE SETTINGS (49)

50G1 Tap / Pickup (for
sensitive ground)

50G1 Pickup Pickup 50G1 0.005 A 0.005-0.12 A 0.001 A

50G1 Time Delay 50G1 Time Delay Delay 50G1 0 s. 0 – 600.00 s. 0.01 s.

Ground IOC Low Setting 50G2 Function Ground IOC 50G2

50G2 Permission to Trip 50G2 Trip Trip Enable 50G2 No Yes/No NA

50G2 Tap / Pickup (for 1/5 A
ground)

50G2 Pickup Pickup 50G2 1 In (Ground) 0.1 – 30 In (Gnd) 0.1 In (G)

50G2 Tap / Pickup (for
sensitive ground)

50G2 Pickup Pickup 50G2 0.005 A 0.005-0.12 A 0.001 A

50G2 Time Delay 50G2 Time Delay Delay 50G2 0 s. 0 – 600.00 s. 0.01 s.

ENERVISTA MII SETUP HMI DEFAULT RANGE STEP

Thermal Image (49) 49 Function THERMAL

MODEL 49

Permission to Trip 49 Trip Trip Enable 49 No Yes/No NA

49 Tap / Pickup 49 Pickup Pickup 49 1 In (Phase) 0.10 – 2.4 In (Ph) 0.01 In (Ph)

Overload Percent Alarm 49 Alarm Level Alarm Level 49 80 % 70% – 100% ITH 1%
Heating Time Constant τ1 T1 Heat Time 49 6 3 – 600 min. 1 min
Cooling Time Constant τ2 T2 Cool Time 49 1 1 – 6 times τ11

GEK-106237P MIFII Digital Feeder Relay 5-5

5 SETTINGS 5.2 MAIN SETTINGS

5

5.2.4 AUTORECLOSER SETTINGS (79)

ENERVISTA MII
SETUP

HMI DEFAULT RANGE STEP

Autorecloser (79) AUTORECLOSER 79 AUTORECLOSE

R 79

Autorecloser Function Autorecloser Function AR Function No Yes / No N/A

Number of shots Number of shots AR Max Shots 1 1 – 4 1

Delay before 1

st

reclosure

AR Dead Time Shot 1 AR Dead Time 1 1 s 0.1 – 600 0.01

Delay before 2

nd

reclosure

AR Dead Time Shot 2 AR Dead Time 2 2 s 0.1 – 600 0.01

Delay before 3

rd

reclosure

AR Dead Time Shot 3 AR Dead Time 3 3 s 0.1 – 600 0.01

Delay before 4

th

reclosure

AR Dead Time Shot 4 AR Dead Time 4 4 s 0.1 – 600 0.01

Time delay to reset from lockout
status

AR Reset Lockout
Time

AR Rst LO Delay 10 s 0.1 – 600 0.01

Time for incomplete sequence AR Incomplete

Sequence Time

AR Inc Seq Time 5 s 0.1 – 600 0.01

Recloser reset time after a
successful reclosure

AR Reset Time AR Reset Time 10 s 0.1 – 600 0.01

AUTORECLOSE INITIATION MASKS

Permission for 50P1 to Init
Autorecloser

AR 50P1 Permission
Init

AR 50P1 Init Yes Yes / No N/A

Permission for 50G1 to Init
Autorecloser

AR 50G1 Permission
Init

AR 50G1 Init Yes Yes / No N/A

Permission for 50P2 to Init
Autorecloser

AR 50P2 Permission
Init

AR 50P2 Init Yes Yes / No N/A

Permission for 50G2 to Init
Autorecloser

AR 50G2 Permission
Init

AR 50G2 Init Yes Yes / No N/A

Permission for 51P to Init
Autorecloser

AR 51P Permission Init AR 51P Init Yes Yes / No N/A

Permission for 51G to Init
Autorecloser

AR 51G Permission Init AR 51G Init Yes Yes / No N/A

Permission for 49 to Init
Autorecloser

AR 49 Permission Init AR 49 Init Yes Yes / No N/A

Permission for a DI to Init
Autorecloser

AR External
Permission Init

AR EXTERN Init Yes Yes / No N/A

AFTER 1ST TRIP MASKS

Permission for 50P1 function to
trip after Shot 1

AR 50P1 Shot 1
Permission

AR 50P1 Shot 1 Yes Yes / No N/A

Permission for 50G1 function to
trip after Shot 1

AR 50G1 Shot 1
Permission

AR 50G1 Shot 1 Yes Yes / No N/A

Permission for 50P2 function to
trip after Shot 1

AR 50P2 Shot 1
Permission

AR 50P2 Shot 1 Yes Yes / No N/A

Permission for 50G2 function to
trip after Shot 1

AR 50G2 Shot 1
Permission

AR 50G2 Shot 1 Yes Yes / No N/A

Permission for 51P function to
trip after Shot 1

AR 51P Shot 1
Permission

AR 51P Shot 1 Yes Yes / No N/A

Permission for 51G function to
trip after Shot 1

AR 51G Shot 1
Permission

AR 51G Shot 1 Yes Yes / No N/A

Permission for 49 function to trip
after Shot 1

AR 49 Shot 1
Permission

AR 49 Shot 1 Yes Yes / No N/A

5-6 MIFII Digital Feeder Relay GEK-106237P

5.2 MAIN SETTINGS 5 SETTINGS

ENERVISTA MII
SETUP

HMI DEFAULT RANGE STEP

AFTER 2ND TRIP MASKS

Permission for 50P1 function to
trip after Shot 2

AR 50P1 Shot 2
Permission

AR 50P1 Shot 2 Yes Yes / No N/A

Permission for 50G1 function to
trip after Shot 2

AR 50G1 Shot 2
Permission

AR 50G1 Shot 2 Yes Yes / No N/A

Permission for 50P2 function to
trip after Shot 2

AR 50P2 Shot 2
Permission

AR 50P2 Shot 2 Yes Yes / No N/A

Permission for 50G2 function to
trip after Shot 2

AR 50G2 Shot 2
Permission

AR 50G2 Shot 2 Yes Yes / No N/A

Permission for 51P function to
trip after Shot 2

AR 51P Shot 2
Permission

AR 51P Shot 2 Yes Yes / No N/A

Permission for 51G function to
trip after Shot 2

AR 51G Shot 2
Permission

AR 51G Shot 2 Yes Yes / No N/A

Permission for 49 function to trip
after Shot 2

AR 49 Shot 2
Permission

AR 49 Shot 2 Yes Yes / No N/A

AFTER 3RD TRIP MASKS

Permission for 50P1 function to
trip after Shot 3

AR 50P1 Shot 3
Permission

AR 50P1 Shot 3 Yes Yes / No N/A

Permission for 50G1 function to
trip after Shot 3

AR 50G1 Shot 3
Permission

AR 50G1 Shot 3 Yes Yes / No N/A

Permission for 50P2 function to
trip after Shot 3

AR 50P2 Shot 3
Permission

AR 50P2 Shot 3 Yes Yes / No N/A

Permission for 50G2 function to
trip after Shot 3

AR 50G2 Shot 3
Permission

AR 50G2 Shot 3 Yes Yes / No N/A

Permission for 51P function to
trip after Shot 3

AR 51P Shot 3
Permission

AR 51P Shot 3 Yes Yes / No N/A

Permission for 51G function to
trip after Shot 3

AR 51G Shot 3
Permission

AR 51G Shot 3 Yes Yes / No N/A

Permission for 49 function to trip
after Shot 3

AR 49 Shot 3
Permission

AR 49 Shot 3 Yes Yes / No N/A

AFTER 4TH TRIP MASKS

Permission for 50P1 function to
trip after Shot 4

AR 50P1 Shot 4
Permission

AR 50P1 Shot 4 Yes Yes / No N/A

Permission for 50G1 function to
trip after Shot 4

AR 50G1 Shot 4
Permission

AR 50G1 Shot 4 Yes Yes / No N/A

Permission for 50P2 function to
trip after Shot 4

AR 50P2 Shot 4
Permission

AR 50P2 Shot 4 Yes Yes / No N/A

Permission for 50G2 function to
trip after Shot 4

AR 50G2 Shot 4
Permission

AR 50G2 Shot 4 Yes Yes / No N/A

Permission for 51P function to
trip after Shot 4

AR 51P Shot 4
Permission

AR 51P Shot 4 Yes Yes / No N/A

Permission for 51G function to
trip after Shot 4

AR 51G Shot 4
Permission

AR 51G Shot 4 Yes Yes / No N/A

Permission for 49 function to trip
after Shot 4

AR 49 Shot 4
Permission

AR 49 Shot 4 Yes Yes / No N/A

GEK-106237P MIFII Digital Feeder Relay 5-7

5 SETTINGS 5.3 ADVANCED SETTINGS

5

5.3ADVANCED SETTINGS

NOTE ABOUT THE TRIP MIN TIME SETTING:

This setting indicates the time during which the tripping contact will remain closed as a minimum in case of fault. If the fault
persists for a longer time than the set value, the tripping contact will remain closed and will be opened immediately after the
fault is cleared, while if the fault is shorter than the set time, the relay will maintain the contact closed for this set time.

5-8 MIFII Digital Feeder Relay GEK-106237P

5.3 ADVANCED SETTINGS 5 SETTINGS

5.3.1 PHASE / GROUND TOC SETTINGS (51P/ 51G) (GROUP 2)

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

ENERVISTA MII
SETUP

HMI DEFAULT RANGE STEP

Ph TOC Funct.
group 2

Phase TOC 51P
(group 2)

PHASE TOC 51P

51P Permission to
Trip

Trip Enable 51P Trip Enable 51P No Yes/No NA

51P Pickup Value Pickup 51P Pickup 51P 0.5 In (Phase) 0.1 – 2.4 In (Ph) 0.01 In

(P)

51P Curve Type Curve 51P Curve 51P DEFINITE

TIME

DEFINITE TIME, USER, MOD INVERSE,
VERY INVERSE, EXTR INVERSE,
INVERSE LONG, INVERSE SHORT

NA

51P Time Dial TD mult 51P TD mult 51P 0.5 0.05 – 2.00 (IEC curves) 0.01

5 0.5 – 20.0 (ANSI curves) 0.01

0.5 0.5 – 10.0 (IAC curves) 0.01

51P Definite Time
Delay

Def Time 51P Def Time 51P 1.00 s. 0.00 – 600.00 s. 1.00 s.

Gnd TOC Fun.
group 2

Ground TOC 51G
(group 2)

GROUND TOC 51G

51G Permission to
Trip

Trip Enable 51G Trip Enable 51G No Yes/No NA

51G Pickup Value
(1/5 A ground)

Pickup 51G Pickup 51G 0.5 In

(Ground)

0.10 – 2.40 In (Gnd) 0.01 In
(G)

51G Pickup Value
(sensitive ground)

Pickup 51G Pickup 51G 0.005 A 0.005-0.12 A 0.001 A

51G Curve Type Curve 51G Curve 51G DEFINITE

TIME

DEFINITE TIME, USER, MOD INVERSE,
VERY INVERSE, EXTR INVERSE,
INVERSE LONG, INVERSE SHORT

NA

51G Time Dial TD mult 51G TD mult 51G 0.5 0.05 – 2.00 (IEC curves) 0.01

5 0.5 – 20.0 (ANSI curves) 0.01

0.5 0.5 – 10.0 (IAC curves) 0.01

51G Definite Time
Delay

Def Time 51G Def Time 51G 1.00 0.00 – 600.00 s 0.01 s

ENERVISTA MII SETUP HMI DEFAULT RANGE STEP

Ph IOC High Set group 2 PHASE IOC 50P1 (group 2) Phase IOC 50P1

50P1 Permission to Trip Trip Enable 50P1 Trip Enable 50P1 No Yes/No NA

50P1 Pickup Pickup 50P1 Pickup 50P1 1 In (Phase) 0.1 – 30 In (Ph) 0.1 In (Ph)

50P1 Time Delay Delay 50P1 Delay 50P1 0 s. 0.00 –600.00s. 0.01 s.

Ph IOC Low Set group 2 PHASE IOC 50P2 (group 2) Phase IOC 50P2

50P2 Permission to Trip Trip Enable 50P2 Trip Enable 50P2 No Yes/No NA

50P2 Pickup Pickup 50P2 Pickup 50P2 1 In (Phase) 0.1 – 30 In (Ph) 0.1 In (Ph)

50P2 Time Delay Delay 50P2 Delay 50P2 0 s. 0.00 –600.00s. 0.01 s.

Gnd IOC High Set group 2 GROUND IOC 50G1 (group 2) Ground IOC 50G1

50G1 Permission to Trip Trip Enable 50 G1 Trip Enable 50 G1 No Yes/No NA

50 G1 Pickup (1/5 A ground) Pickup 50G1 Pickup 50G1 1 In (Ground) 0.1 – 30 In (Gnd) 0.1 In (G)

50 G1 Pickup Value (sensitive
ground)

Pickup 50G1 Pickup 50G1 0.005 A 0.005-0.12 A 0.001 A

50 G1 Time Delay Delay 50G1 Delay 50G1 0 s. 0.00 – 600.00 s. 0.01 s.

Gnd IOC Low Set group 2 GROUND IOC 50G2 (group 2) Ground IOC 50G2

50G2 Permission to Trip Trip Enable 50G2 Trip Enable 50G2 No Yes/No NA

50G2 Pickup (1/5 A ground) Pickup 50G2 Pickup 50G2 1 In (Ground) 0.1 – 30 In (Gnd) 0.1 In (G)

50G2 Pickup Value (sensitive
ground)

Pickup 50G2 Pickup 50G2 0.005 A 0.005-0.12 A 0.001 A

50G2 Time Delay Delay 50G2 Delay 50G2 0 s. 0.00 –600.00s. 0.01 s.

GEK-106237P MIFII Digital Feeder Relay 5-9

5 SETTINGS 5.3 ADVANCED SETTINGS

5

5.3.3 THERMAL IMAGE SETTINGS (49) (GROUP 2)

USER CURVE

ENERVISTA MII SETUP HMI DEFAULT RANGE STEP

Thermal Image group 2 49 Function (group 2) THERMAL MODEL 49

Permission to Trip Trip Enable 49 Trip Enable 49 No Yes/No NA

49 Pickup Pickup 49 Pickup 49 1 In (Phase) 0.10 – 2.40 In (Ph) 0.01 In (Ph)

Overload Percent Alarm Alarm Level 49 Alarm Level 49 80 % 70% – 100% ITH
Heating Time Constant τ1 Heat Time 49 Heat Time 49 6 3 – 600 min. 1 min.
Cooling Time Constant τ2 Cool Time 49 Cool Time 49 1 1– 6 times τ11

ENERVISTA MII SETUP HMI DEFAULT RANGE STEP

Parameters User Curve User Curve

A A Parameter A Parameter 0.0500 0.0000-125.0000 0.0001

B B Parameter B Parameter 0.0000 0.0000-3.0000 0.0001

P P Parameter P Parameter 0.0400 0.0000-3.0000 0.0001

Q Q Parameter Q Parameter 1.0000 0.0000-2.0000 0.0001

K K Parameter K Parameter 0.000 0.000-1.999 0.001