GE 745 TRANSFORMER MANAGEMENT RELAY User manual

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GE Grid Solutions
650 Markland Street
Markham, Ontario
Canada L6C 0M1
Tel: [phone] Fax: [phone]
Internet: http://www.gegridsolutions.com
745 revision: 5.20
Manual Part Number: 1601-0161-AG
GE publication code: GEK-106635Q
745
Transformer Protection System
Instruction Manual
GE
Grid Solutions
*1601-0161-AG*

© 2016 GE Multilin Inc. All rights reserved.
GE Multilin Inc. 745 Transformer Protection System instruction manual for revision 5.20.
745 Transformer Protection System, EnerVista, EnerVista Launchpad, EnerVista 745 Setup, and FlexLogic are registered
trademarks of GE Multilin Inc.
The contents of this manual are the property of GE Multilin Inc. This documentation is furnished on license and may not be
reproduced in whole or in part without the permission of GE Multilin Inc. The content of this manual is for informational use
only and is subject to change without notice.
Part numbers contained in this manual are subject to change without notice, and should therefore be verified by GE
Multilin Inc. before ordering.
Part number: 1601-0161-AG (June 2016)

745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL TOC–I
Table of Contents
1: GETTING STARTED IMPORTANT PROCEDURES .......................................................................................................... 1-1
CAUTIONS AND WARNINGS ............................................................................................... 1-1
INSPECTION CHECKLIST ...................................................................................................... 1-1
MANUAL ORGANIZATION ................................................................................................... 1-2
USING THE RELAY ............................................................................................................................ 1-3
MENU NAVIGATION ............................................................................................................. 1-3
PANEL KEYING EXAMPLE .................................................................................................... 1-5
CHANGING SETPOINTS ................................................................................................................. 1-6
INTRODUCTION ..................................................................................................................... 1-6
USING THE HELP KEY ........................................................................................................ 1-6
NUMERICAL SETPOINTS ...................................................................................................... 1-6
ENUMERATION SETPOINTS ................................................................................................. 1-7
TEXT SETPOINTS .................................................................................................................. 1-7
SECURITY ............................................................................................................................................. 1-9
INSTALLATION ....................................................................................................................... 1-9
CHANGING THE PASSCODE ................................................................................................ 1-9
DISABLING AND ENABLING PASSCODE SECURITY .......................................................... 1-10
2: OVERVIEW INTRODUCTION ................................................................................................................................ 2-1
DESCRIPTION ........................................................................................................................ 2-1
PROTECTION FEATURES ...................................................................................................... 2-2
ORDER CODES ..................................................................................................................... 2-3
SPECIFICATIONS ............................................................................................................................... 2-5
APPLICABILITY ...................................................................................................................... 2-5
INPUTS .................................................................................................................................. 2-5
PROTECTION ELEMENTS ...................................................................................................... 2-6
OUTPUTS ...............................................................................................................................2-9
MISCELLANEOUS .................................................................................................................. 2-10
3: INSTALLATION DRAWOUT CASE ............................................................................................................................... 3-1
CASE DESCRIPTION ............................................................................................................. 3-1
PANEL CUTOUT .................................................................................................................... 3-2
CASE MOUNTING ................................................................................................................. 3-2
UNIT WITHDRAWAL AND INSERTION ................................................................................ 3-3
ETHERNET CONNECTION ..................................................................................................... 3-6
TYPICAL WIRING ............................................................................................................................... 3-7
DESCRIPTION ........................................................................................................................ 3-7
REAR TERMINAL LAYOUT .................................................................................................... 3-7
WIRING DIAGRAMS ............................................................................................................. 3-10
PHASE SEQUENCE AND TRANSFORMER POLARITY ......................................................... 3-12
CURRENT TRANSFORMER INPUTS ..................................................................................... 3-12
AC VOLTAGE INPUT ............................................................................................................ 3-14
LOGIC INPUTS ...................................................................................................................... 3-14
CONTROL POWER ................................................................................................................ 3-15
ANALOG INPUT .................................................................................................................... 3-16
TAP POSITION INPUT ........................................................................................................... 3-16
RTD DRIVER/SENSOR ........................................................................................................ 3-16
OUTPUT RELAYS .................................................................................................................. 3-16

TOC–II 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
SOLID STATE TRIP OUTPUT ................................................................................................ 3-17
ANALOG OUTPUTS .............................................................................................................. 3-17
RS485/RS422 COMMUNICATIONS ................................................................................ 3-17
RS232 FRONT PANEL PROGRAM PORT .......................................................................... 3-19
IRIG-B .................................................................................................................................. 3-20
DIELECTRIC STRENGTH ....................................................................................................... 3-20
4: INTERFACES HARDWARE INTERFACE ................................................................................................................ 4-1
FRONT PANEL ......................................................................................................................4-1
DISPLAY ................................................................................................................................. 4-2
LEDS..................................................................................................................................... 4-2
LED INDICATORS ................................................................................................................. 4-2
PROGRAM PORT ................................................................................................................... 4-4
KEYPAD ................................................................................................................................. 4-4
SETPOINT ENTRY .................................................................................................................. 4-5
DIAGNOSTIC MESSAGES ..................................................................................................... 4-7
FLASH MESSAGES ................................................................................................................ 4-7
ENERVISTA SOFTWARE INTERFACE .........................................................................................4-8
OVERVIEW ............................................................................................................................ 4-8
HARDWARE ........................................................................................................................... 4-8
INSTALLING THE ENERVISTA 745 SETUP SOFTWARE .................................................... 4-10
CONNECTING ENERVISTA 745 SETUP TO THE RELAY ...................................................... 4-13
CONFIGURING SERIAL COMMUNICATIONS ........................................................................ 4-13
USING THE QUICK CONNECT FEATURE ............................................................................ 4-15
CONFIGURING ETHERNET COMMUNICATIONS ................................................................. 4-15
CONNECTING TO THE RELAY .............................................................................................. 4-17
WORKING WITH SETPOINTS AND SETPOINT FILES ........................................................... 4-19
ENGAGING ADEVICE ........................................................................................................... 4-19
ENTERING SETPOINTS ......................................................................................................... 4-19
FILE SUPPORT ...................................................................................................................... 4-21
USING SETPOINTS FILES ..................................................................................................... 4-21
UPGRADING RELAY FIRMWARE ................................................................................................. 4-27
DESCRIPTION ........................................................................................................................ 4-27
SAVING SETPOINTS TO AFILE ............................................................................................ 4-27
LOADING NEW FIRMWARE ................................................................................................. 4-27
ADVANCED ENERVISTA 745 SETUP FEATURES ................................................................... 4-30
TRIGGERED EVENTS ............................................................................................................. 4-30
WAVEFORM CAPTURE (TRACE MEMORY) .......................................................................... 4-30
TRENDING (DATA LOGGER) ................................................................................................. 4-32
EVENT RECORDER ................................................................................................................ 4-35
MODBUS USER MAP ........................................................................................................... 4-36
VIEWING ACTUAL VALUES .................................................................................................. 4-37
USING ENERVISTA VIEWPOINT WITH THE 745 ................................................................... 4-40
PLUG AND PLAY EXAMPLE ................................................................................................. 4-40
5: SETPOINTS OVERVIEW ........................................................................................................................................... 5-1
SETPOINT MESSAGE MAP ................................................................................................... 5-1
SETPOINT ENTRY .................................................................................................................. 5-4
SETPOINT WRITE ACCESS ................................................................................................... 5-4
AUTO-CONFIGURATION ................................................................................................................ 5-6
INTRODUCTION ..................................................................................................................... 5-6
DYNAMIC CT RATIO MISMATCH CORRECTION ................................................................ 5-6

745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL TOC–III
PHASE SHIFTS ON THREE-PHASE TRANSFORMERS ......................................................... 5-8
PHASE ANGLE CORRECTION .............................................................................................. 5-10
ZERO-SEQUENCE COMPONENT REMOVAL ....................................................................... 5-11
TRANSFORMER TYPES ......................................................................................................... 5-13
PHASE SHIFTS ...................................................................................................................... 5-24
S1 745 SETUP .................................................................................................................................... 5-25
PASSCODE ............................................................................................................................ 5-25
PREFERENCES ....................................................................................................................... 5-25
COMMUNICATIONS .............................................................................................................. 5-26
RESETTING ............................................................................................................................ 5-29
CLOCK ................................................................................................................................... 5-29
DEFAULT MESSAGES ........................................................................................................... 5-30
SCRATCHPAD ........................................................................................................................ 5-31
INSTALLATION ....................................................................................................................... 5-31
UPGRADE OPTIONS ............................................................................................................. 5-31
SETUP EVENT RECORDER ................................................................................................... 5-33
S2 SYSTEM SETUP ............................................................................................................................ 5-34
DESCRIPTION ........................................................................................................................ 5-34
TRANSFORMER ..................................................................................................................... 5-34
WINDINGS 1 TO 3 ............................................................................................................... 5-36
ONLOAD TAP CHANGER ..................................................................................................... 5-37
HARMONICS ......................................................................................................................... 5-38
FLEXCURVES™ .................................................................................................................... 5-38
VOLTAGE INPUT ................................................................................................................... 5-39
AMBIENT TEMPERATURE ..................................................................................................... 5-39
ANALOG INPUT .................................................................................................................... 5-41
DEMAND METERING ............................................................................................................ 5-41
ANALOG OUTPUTS 1 TO 7 ................................................................................................. 5-43
S3 LOGIC INPUTS ............................................................................................................................. 5-44
DESCRIPTION ........................................................................................................................ 5-44
LOGIC INPUTS 1 TO 16 ...................................................................................................... 5-44
VIRTUAL INPUTS 1 TO 16 .................................................................................................. 5-45
S4 ELEMENTS ..................................................................................................................................... 5-46
INTRODUCTION TO ELEMENTS ........................................................................................... 5-46
SETPOINT GROUP ................................................................................................................ 5-47
DIFFERENTIAL ELEMENT ..................................................................................................... 5-48
INSTANTANEOUS DIFFERENTIAL ........................................................................................ 5-57
PHASE OVERCURRENT ........................................................................................................ 5-58
NEUTRAL OVERCURRENT .................................................................................................... 5-66
GROUND OVERCURRENT .................................................................................................... 5-69
RESTRICTED GROUND FAULT ............................................................................................. 5-72
NEGATIVE SEQUENCE OVERCURRENT .............................................................................. 5-76
FREQUENCY .......................................................................................................................... 5-78
OVEREXCITATION ................................................................................................................. 5-83
HARMONICS ......................................................................................................................... 5-88
INSULATION AGING ............................................................................................................. 5-90
ANALOG INPUT LEVEL ......................................................................................................... 5-94
CURRENT DEMAND ............................................................................................................. 5-95
TRANSFORMER OVERLOAD ................................................................................................. 5-96
TAP CHANGER FAILURE ...................................................................................................... 5-97
S5 OUTPUTS ....................................................................................................................................... 5-99
DESCRIPTION ........................................................................................................................ 5-99
RELAY ASSIGNMENTS .......................................................................................................... 5-99
INTRODUCTION TO FLEXLOGIC™ ...................................................................................... 5-99

TOC–IV 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
FLEXLOGIC™ RULES ........................................................................................................... 5-100
OUTPUT RELAYS .................................................................................................................. 5-102
TRACE MEMORY ................................................................................................................... 5-105
VIRTUAL OUTPUTS ............................................................................................................... 5-106
TIMERS .................................................................................................................................. 5-106
S6 TESTING ......................................................................................................................................... 5-107
DESCRIPTION ........................................................................................................................ 5-107
OUTPUT RELAYS .................................................................................................................. 5-107
ANALOG OUTPUTS .............................................................................................................. 5-108
SIMULATION ......................................................................................................................... 5-108
FACTORY SERVICE ................................................................................................................ 5-112
6: ACTUAL VALUES OVERVIEW ........................................................................................................................................... 6-1
MESSAGE MAP ..................................................................................................................... 6-1
DESCRIPTION ........................................................................................................................ 6-3
A1 STATUS ........................................................................................................................................... 6-4
NETWORK STATUS ............................................................................................................... 6-4
DATE AND TIME ................................................................................................................... 6-4
LOGIC INPUTS ...................................................................................................................... 6-4
VIRTUAL INPUTS ................................................................................................................... 6-5
OUTPUT RELAYS .................................................................................................................. 6-5
VIRTUAL OUTPUTS ............................................................................................................... 6-5
SELF-TEST ERRORS .............................................................................................................. 6-6
A2 METERING ..................................................................................................................................... 6-7
CURRENT ...............................................................................................................................6-7
HARMONIC CONTENT ......................................................................................................... 6-10
FREQUENCY .......................................................................................................................... 6-12
TAP CHANGER ......................................................................................................................6-12
VOLTAGE ...............................................................................................................................6-12
DEMAND ...............................................................................................................................6-13
AMBIENT TEMPERATURE ..................................................................................................... 6-14
LOSS OF LIFE ........................................................................................................................ 6-14
ANALOG INPUT .................................................................................................................... 6-15
POWER .................................................................................................................................. 6-15
ENERGY ................................................................................................................................. 6-15
A3 EVENT RECORDER ..................................................................................................................... 6-17
EVENT DATA CLEAR ............................................................................................................ 6-17
EVENT RECORDS .................................................................................................................. 6-17
A4 PRODUCT INFORMATION ....................................................................................................... 6-21
TECHNICAL SUPPORT .......................................................................................................... 6-21
REVISION CODES ................................................................................................................. 6-21
CALIBRATION ........................................................................................................................ 6-22
TARGET AND FLASH MESSAGES ................................................................................................6-23
TARGET MESSAGES ............................................................................................................. 6-23
SELF-TEST ERRORS .............................................................................................................. 6-25
FLASH MESSAGES ................................................................................................................ 6-27
7: COMMISSIONING GENERAL .............................................................................................................................................. 7-1
INTRODUCTION ..................................................................................................................... 7-1
TESTING PHILOSOPHY ......................................................................................................... 7-2
SAFETY PRECAUTIONS ......................................................................................................... 7-2
CONVENTIONS ...................................................................................................................... 7-2

745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL TOC–V
TEST EQUIPMENT ................................................................................................................. 7-3
PRELIMINARY WORK ...................................................................................................................... 7-5
DESCRIPTION ........................................................................................................................ 7-5
DIELECTRIC STRENGTH TESTING ....................................................................................... 7-6
LOGIC INPUTS AND OUTPUT RELAYS ...................................................................................... 7-7
LOGIC INPUTS ...................................................................................................................... 7-7
OUTPUT RELAYS .................................................................................................................. 7-8
METERING ........................................................................................................................................... 7-9
DESCRIPTION ........................................................................................................................ 7-9
CURRENT INPUTS ................................................................................................................. 7-9
VOLTAGE INPUT ................................................................................................................... 7-10
TRANSFORMER TYPE SELECTION ....................................................................................... 7-11
AMBIENT TEMPERATURE INPUT ......................................................................................... 7-13
ANALOG OUTPUTS ............................................................................................................... 7-14
TAP POSITION ...................................................................................................................... 7-15
PROTECTION SCHEMES ................................................................................................................. 7-16
PRECAUTION ......................................................................................................................... 7-16
HARMONIC RESTRAINED PERCENT DIFFERENTIAL .......................................................... 7-16
INSTANTANEOUS DIFFERENTIAL PROTECTION ................................................................. 7-23
PHASE TIME OVERCURRENT ............................................................................................... 7-25
PHASE INSTANTANEOUS OVERCURRENT 1 ...................................................................... 7-27
PHASE INSTANTANEOUS OVERCURRENT 2 ...................................................................... 7-28
NEUTRAL TIME OVERCURRENT .......................................................................................... 7-29
NEUTRAL INSTANTANEOUS OVERCURRENT 1 ................................................................. 7-31
NEUTRAL INSTANTANEOUS OVERCURRENT 2 ................................................................. 7-32
GROUND TIME OVERCURRENT .......................................................................................... 7-32
GROUND INSTANTANEOUS OVERCURRENT 1 .................................................................. 7-35
GROUND INSTANTANEOUS OVERCURRENT 2 .................................................................. 7-36
RESTRICTED GROUND FAULT POLARITY TEST ................................................................. 7-36
RESTRICTED GROUND FAULT ELEMENT TEST .................................................................. 7-37
NEGATIVE-SEQUENCE TIME OVERCURRENT ..................................................................... 7-39
NEGATIVE-SEQUENCE INSTANTANEOUS OVERCURRENT ................................................ 7-42
FREQUENCY .......................................................................................................................... 7-43
OVEREXCITATION ................................................................................................................. 7-52
INSULATION AGING ............................................................................................................. 7-54
TAP MONITOR FAILURE ...................................................................................................... 7-55
AUXILIARY PROTECTION AND MONITORING FUNCTIONS ............................................. 7-56
THD LEVEL SCHEME .......................................................................................................... 7-56
HARMONIC DERATING FUNCTION ..................................................................................... 7-57
TRANSFORMER OVERLOAD ................................................................................................. 7-58
PLACING THE RELAY INTO SERVICE ......................................................................................... 7-60
PRECAUTIONS ....................................................................................................................... 7-60
PROCEDURE .......................................................................................................................... 7-60
A: APPENDIX CHANGE NOTES ................................................................................................................................ A-1
REVISION HISTORY .............................................................................................................. A-1
CHANGES TO THE 745 MANUAL ...................................................................................... A-2
EU DECLARATION OF CONFORMITY ........................................................................................ A-5
EU DECLARATION ............................................................................................................... A-5
GE DIGITAL ENERGY WARRANTY .............................................................................................. A-6
WARRANTY STATEMENT ..................................................................................................... A-6

TOC–VI 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
B: INDEX

745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–1
745 Transformer Protection
System
Chapter 1: Getting Started
GE
Grid Solutions
Getting Started
1.1 Important Procedures
1.1.1 Cautions and Warnings
Please read this chapter to guide you through the initial setup of your new relay.
Before attempting to install or use the relay, it is imperative that all
WARNINGS and CAUTIONS in this manual are reviewed to help
prevent personal injury, equipment damage, and/or downtime.
1.1.2 Inspection Checklist
• Open the relay packaging and inspect the unit for physical damage.
• View the rear nameplate and verify that the correct model has been ordered.
• Ensure that the following items are included:
– Instruction manual
– GE EnerVista CD (includes software and relay documentation)
– Mounting screws
• For product information, instruction manual updates, and the latest software updates,
please visit the GE Multilin website at http://www.GEmultilin.com
NOTE
Note If there is any noticeable physical damage, or any of the contents listed are missing,
please contact GE Multilin immediately.
WARNING
CAUTION

1–2 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
IMPORTANT PROCEDURES CHAPTER 1: GETTING STARTED
1.1.3 Manual Organization
Reading a lengthy instruction manual on a new product is not a task most people enjoy. To
speed things up, this introductory chapter provides guidelines for basic relay usability.
Important wiring considerations and precautions discussed in Typical W iring on page 3–7
should be observed for reliable operation. Detailed information regarding accuracy, output
relay contact ratings, and so forth are detailed in Specifications on page 2–5. The
remainder of this manual should be read and kept for reference to ensure maximum
benefit from the 745 Transformer Protection System. For further information, please
consult your local sales representative or the factory. Comments about new features or
modifications for your specific requirements are welcome and encouraged.
Setpoints and actual values are indicated as follows in the manual:
A2 METERING  LOSS OF LIFE HOTTEST-SPOT WINDING TEMPERATURE
This ‘path representation’ illustrates the location of a specific actual value or setpoint with
regards to its previous menus and sub-menus. In the example above, the HOTTEST-SPOT
WINDING TEMPERATURE actual value is shown to be an item in the LOSS OF LIFE sub-
menu, which itself is an item in the A2 METERING menu, which is an item of ACTUAL
VALUES.
Sub-menu levels are entered by pressing the MESSAGE RIGHT or ENTER keys. When inside
a submenu, the MESSAGE LEFT or ESCAPE key returns to the previous sub-menu. The
MESSAGE UP and DOWN keys are used to scroll through the settings in a sub-menu. The
display indicates which keys can be used at any given point.

CHAPTER 1: GETTING STARTED USING THE RELAY
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–3
1.2 Using the Relay
1.2.1 Menu Navigation
Press the MENU key to access the header of each menu, which will be displayed in the
following sequence:
To access setpoints, press the MENU key until the display shows the header of the
setpoints menu, and then press the MESSAGE RIGHT or ENTER key to display the header for
the first setpoints page. The setpoint pages are numbered, have an ‘S’ prefix for easy
identification and have a name which provides a general idea of the settings available in
that page. Pressing the MESSAGE UP and DOWN keys will scroll through all the available
setpoint page headers. Setpoint page headers look as follows:
To enter a given setpoints page, press the MESSAGE RIGHT or ENTER key. Press the
MESSAGE UP or DOWN keys to scroll through sub-page headers until the required message
is reached. The end of a page is indicated by the message END OF PAGE. The beginning of a
page is indicated by the message TOP OF PAGE.
To access actual values, press the MENU key until the display shows the header of the
actual values menu, then press the MESSAGE RIGHT or ENTER key to display the header for
the first actual values page. The actual values pages are numbered, have an ‘A’ prefix for
easy identification and have a name, which gives a general idea of the information
available in that page. Pressing the MESSAGE UP or DOWN keys will scroll through all the
available actual values page headers. Actual values page headers look as follows:
To enter a given actual values page, press the MESSAGE RIGHT or ENTER key. Press the
MESSAGE UP or DOWN keys to scroll through sub-page headers until the required message
is reached. The end of a page is indicated by the message END OF PAGE. The beginning of a
page is indicated by the message TOP OF PAGE.
Similarly, to access additional sub-pages, press the MESSAGE RIGHT or ENTER key to enter
the first sub-page, and then the MESSAGE UP or DOWN keys to scroll through the available
sub-pages, until the desired message is reached. The process is identical for both setpoints
and actual values.
The following procedure illustrates the key sequence to access the Current Demand actual
values.
SETPOINTS []
ACTUAL VALUES []
TARGET MESSAGES []
SETPOINTS []
S1 745 SETUP
ACTUAL VALUES []
A1 STATUS

1–4 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
USING THE RELAY CHAPTER 1: GETTING STARTED
1. Press the MENU key until you reach the actual values main menu.
2. Press MESSAGE RIGHT or ENTER key to enter the first actual values page, and then the
MESSAGE UP or DOWN key to scroll through pages, until the A2 METERING DATA page
appears.
3. Press the MESSAGE RIGHT or ENTER key to display the first sub-page heading for the
Metering Data actual values page:
Pressing the MESSAGE UP or DOWN keys will scroll the display up and down through the
sub-page headers. Pressing the MESSAGE LEFT or ESCAPE key at any sub-page heading will
return the display to the heading of the corresponding setpoint or actual value page, and
pressing it again, will return the display to the main menu header.
4. Press the MESSAGE DOWN key until the ZERO-SEQUENCE CURRENT METERING sub-
page heading appears.
5. At this point, pressing MESSAGE RIGHT or ENTER key will display the messages under
this sub-page. If instead you press the MESSAGE UP key, it will return to the previous
sub-page heading. In this case,
6. When the symbols and appear on the top line, it indicates that additional sub-
pages are available and can be accessed by pressing the MESSAGE RIGHT or ENTER
key. Pressing MESSAGE RIGHT or ENTER while at the zero-sequence current metering
sub-page heading displays the following:
Pressing the MESSAGE LEFT key returns to the zero-sequence current metering sub-page
heading.
7. Press the MESSAGE DOWN key to display the next actual value of this sub-page. Actual
values and setpoints messages always have a colon separating the name of the value
and the actual value or setpoint. This particular message displays the current demand
as measured by the relay.
The menu path to the value shown above is indicated as A2 METERING DATA  ZERO
SEQUENCE CURRENT METERING W1 NEG SEQ CURRENT. Setpoints and actual values
messages are referred to in this manner throughout the manual.
ACTUAL VALUES []
ACTUAL VALUES []
A2 METERING DATA
CURRENT []
METERING
ZERO SEQUENCE []
CURRENT METERING
POS. SEQUENCE []
CURRENT METERING
W1 NEG SEQ CURRENT:
0 A at 0° Lag

CHAPTER 1: GETTING STARTED USING THE RELAY
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–5
1.2.2 Panel Keying Example
For example, the S4 ELEMENTS  INSULATION AGING  AGING FACTOR LIMIT  AGING
FACTOR LIMIT PICKUP path representation describes the following key-press sequence:
1. Press the MENU key until the setpoints header appears on the display.
2. Press the MESSAGE RIGHT or ENTER key, and then the MESSAGE DOWN key until the S4
ELEMENTS message is displayed.
3. Press the MESSAGE RIGHT or ENTER key to display INSULATION AGING message.
4. Press the MESSAGE RIGHT or ENTER key to display AGING FACTOR LIMIT message.
5. Press the MESSAGE RIGHT or ENTER key to reach the AGING FACTOR LIMIT PICKUP
message and the corresponding setpoint value.
6. Press the MESSAGE DOWN key to display the next actual value message as shown
below:
7. Pressing the MESSAGE UP or DOWN keys scrolls the display up and down through all
the setpoint displays in this corresponding sub-page.
8. Pressing the MESSAGE LEFT key reverses the process described above and returns the
display to the previous level.
9. Press the MESSAGE LEFT key twice to return to the S4 ELEMENTS page header.
SETPOINTS []
SETPOINTS []
S4 ELEMENTS
INSULATION []
AGING
AGING FACTOR []
LIMIT
AGING FACTOR LIMIT
PICKUP: 2.0
AGING FACTOR LIMIT
DE L AY: 1 0 m in.
AGING FACTOR []
LIMIT
SETPOINTS []
S4 ELEMENTS

1–6 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHANGING SETPOINTS CHAPTER 1: GETTING STARTED
1.3 Changing Setpoints
1.3.1 Introduction
There are several different classes of setpoints, distinguished by the way their values are
displayed and edited. This section describes how to edit the values used by all setpoint
classes.
Hardware and passcode security features are designed to provide protection against
unauthorized setpoint changes. Since we will be programming new setpoints using the
front panel keys, a hardware jumper must be installed across the setpoint access terminals
(D9 and D10) on the back of the relay case. A keyswitch may also be used across these
terminals to enable setpoint access. Attempts to enter a new setpoint via the front panel
without this connection will be unsuccessful.
1.3.2 Using the HELP Key
Each numerical setpoint has its own minimum, maximum, and increment value associated
with it. These parameters define what values are acceptable for a setpoint.
1. Select the S2 SYSTEM SETUP  VOLTAGE INPUT  NOMINAL VT SECONDARY
VOLTAGE setpoint.
2. Press HELP. The following context sensitive flash message will appear for several
seconds. For the case of a numerical setpoint message, the HELP key displays the
minimum, maximum, and step value.
1.3.3 Numerical Setpoints
The following two methods of editing and storing a numerical setpoint value are available.
1. 0to 9and the decimal key: The relay numeric keypad works the same as that of any
electronic calculator. A number is entered one digit at a time. The left-most digit is
entered first and the right-most digit is entered last. Pressing the ESCAPE key, before
the ENTER key, returns the original value to the display.
2. VALUE keys: The VALUE UP key increments the displayed value, by the step value, up to
the maximum value allowed. While at the maximum, pressing the VALUE UP key again
will allow setpoint selection to continue from the minimum value. The VALUE DOWN
key decrements the displayed value, by the step value, down to the minimum value.
Again, continuing to press the VALUE DOWN key while at the minimum value will
continue setpoint selection from the maximum value.
NOMINAL VT SECONDARY
VOLTAGE: 120.0 V
Range: 60.0
to 120.0 by 0.1

CHAPTER 1: GETTING STARTED CHANGING SETPOINTS
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–7
As an example, let’s set the nominal VT secondary voltage setpoint to 69.3 V. Press the
appropriate numeric keys in the sequence ‘6 9 . 3‘. The display message will change as
the digits are being entered.
Editing changes are not registered until the ENTER key is pressed. Press the ENTER key to
store the new value in memory. This flash message momentarily appears to confirmation
the storing process. If 69.28 were entered, the value is automatically rounded to 69.3, since
the step value for this setpoint is 0.1.
1.3.4 Enumeration Setpoints
Enumeration setpoints have data values which are part of a set, whose members are
explicitly defined by a name. A set is comprised of two or more members.
Enumeration type values are changed using the VALUE keys. The VALUE UP key displays
the next selection while the VALUE DOWN key displays the previous selection. As an
example we may need to set the phase sequence to ACB. Press the VALUE keys until the
proper selection is displayed.
Editing changes are not registered until ENTER is pressed, storing the new value in
memory. This flash message momentarily appears to confirm the storing process.
1.3.5 Text Setpoints
Text setpoints have data values which are fixed in length, but user defined in character.
They may be comprised of upper case letters, lower case letters, numerals, and a selection
of special characters.
The editing and storing of a text value is accomplished with the use of the decimal, ENTER,
VALUE, and ESCAPE keys. For example:
1. The name for output relay 3 should be more descriptive than the default value. For this
example let us rename output relay as INST DIFF TRIP. Press the decimal key and an
underscore (_) will appear at the first character position.
2. Press VALUE keys until the character “I” is displayed in the first position, then press the
decimal key to store the character and advance the cursor. Change the second
character to a “N” using the VALUE keys and save this change by pressing the decimal
key again. Continue editing all the characters in the text until the string INST DIFF TRIP
is entered. Note that a space is selected like a character. If a character is entered
NOMINAL VT SECONDARY
VOLTAGE: 69.3 V
NEW SETPOINT HAS
BEEN STORED
PHASE SEQUENCE:
ACB
NEW SETPOINT HAS
BEEN STORED
OUTPUT 3 NAME:
Trip 3

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CHANGING SETPOINTS CHAPTER 1: GETTING STARTED
incorrectly, press the decimal key repeatedly until the cursor returns to the position of
the error and re-enter the character as required. Once complete, press ENTER to
remove the solid cursor and save the result.
OUTPUT 3 NAME:
INST DIFF TRIP

CHAPTER 1: GETTING STARTED SECURITY
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–9
1.4 Security
1.4.1 Installation
Note that the relay is defaulted to the “Not Programmed” state before it leaves the factory.
This safeguards against the installation of a relay whose setpoints have not been entered.
In addition, a relay in the “Not Programmed” state blocks signaling of any output relay, and
turns off the In Service LED indicator.
Move to the S1 745 SETUP  INSTALLATION  745 SETPOINTS message. To put the relay
in the “Programmed” state, press the VALUE UP or DOWN key once and press ENTER. Enter
“Yes” for the ARE YOU SURE? message. The In Service LED indicator will now turn on.
1.4.2 Changing the Passcode
To guarantee that the relay settings cannot be tampered with, the user may setup the
passcode security feature.
1. Move to the S1 745 SETUP PASSCODE SETPOINT ACCESS message. This message
cannot be edited directly. It simply indicates whether passcode security is enabled
(SETPOINT ACCESS:“Read Only”), or passcode security is disabled (SETPOINT ACCESS:
“Read & Write”). Each relay is shipped from the factory with setpoint access allowed.
The passcode is also defaulted to '0', which disables the passcode security feature
entirely.
2. Press the MESSAGE DOWN key once.
3. Press the VALUE UP or VALUE DOWN key once.
4. Press the ENTER key to begin the procedure of changing the passcode. The displayed
message will change as shown. The current passcode is '0', so press the '0' numeric
key. The relay will acknowledge the key press by displaying ‘*’.
5. Press the ENTER key.
745 SETPOINTS:
Not Programmed
SETPOINT ACCESS:
Read & Write
CHANGE PASSCODE?
No
CHANGE PASSCODE?
Yes
PLEASE ENTER CURRENT
PASSCODE:
ENTER NEW PASSCODE
FOR ACCESS:

1–10 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
SECURITY CHAPTER 1: GETTING STARTED
6. For this example, change the passcode to “123” by pressing the appropriate numeric
keys in the ‘1 2 3’ sequence. The message will change as the digits are entered, with
the end result being as shown.
7. Press the ENTER key to store the new passcode and a confirmation message appears.
As a safety measure, the relay requires you to enter a new passcode twice. This
ensures the passcode has been entered correctly.
8. After pressing the appropriate numeric keys in the sequence ‘1 2 3’, press ENTER. This
flash message appears momentarily on the display and confirms the new passcode is
stored in memory.
9. After a few seconds, the original display returns.
10. Press the MESSAGE UP key. As soon as a non-zero passcode is entered, setpoint
access will automatically become restricted.
1.4.3 Disabling and Enabling Passcode Security
Suppose at some time in the future you want to alter a setpoint. In order to do this, you
must first disable passcode security, make the setpoint change, and then re-enable the
passcode security.
1. Move to message S1 745 SETUP PASSCODE  ALLOW ACCESS TO SETPOINTS. It is
from here that we will disable passcode security. Please note that this message is
hidden, when the passcode security feature is disabled by entering a passcode of “0”.
2. Press the VALUE UP or DOWN key once to select “Yes” and press ENTER. The displayed
message will change as shown.
3. Enter the current passcode and press the ENTER key. This flash message indicates
that the keyed in value was accepted and that passcode security is now disabled.
ENTER NEW PASSCODE
FOR ACCESS: ***
PLEASE RE-ENTER NEW
PASSCODE:
NEW PASSCODE
HAS BEEN STORED
ALLOW ACCESS TO
SETPOINTS? No
ALLOW ACCESS TO
SETPOINTS? No
PLEASE ENTER CURRENT
PASSCODE:
SETPOINT ACCESS
IS NOW ALLOWED

CHAPTER 1: GETTING STARTED SECURITY
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–11
4. This message will appear after a few seconds. Now that setpoint access is enabled,
the ALLOW ACCESS TO SETPOINTS message has been replaced by the RESTRICT
ACCESS TO SETPOINTS message. The relay’s setpoints can now be altered and stored.
If no front panel keys are pressed for longer than 30 minutes, setpoint access will
automatically become restricted again.
5. To disable setpoint access, immediately after setpoint editing, move back to message
S1 745 SETUP PASSCODE  RESTRICT ACCESS TO SETPOINTS and enter “Yes”. Key
the current passcode into the shown message.
6. Press the ENTER key and this message will flash on the display. It indicates that
passcode security is now enabled.
7. After a few seconds, the original display returns.
RESTRICT ACCESS TO
SETPOINTS? No
PLEASE ENTER CURRENT
PASSCODE:
SETPOINT ACCESS
IS NOW RESTRICTED

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