Instruction manual [PDF] (484 pages)
- Updated: 15.05.2026
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Instruction manual
Product version: 1.4x
GE publication code: 1601-0651-A1 (GEK-119651)
*1601-0450-A1*
845
Transformer Protection Relay
Transformer Protection, Control and Management
GE
Digital Energy
© 2015 GE Multilin Incorporated. All rights reserved.
GE Multilin 845 Transformer Protection System instruction manual for revision 1.4x.
845 Transformer Protection System, EnerVista, EnerVista Launchpad, and EnerVista 8
Series Setup softwrare 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. The content of this manual is for informational use only and is subject to
change without notice.
Part number: 1601-0651-A1 (May 2015)
Note
May contain components with FCC ID: XF6-RS9110N1122
and IC ID: 8407A-RS9110N1122.
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
TOC–I
Table of Contents
1.INTRODUCTION
Overview .............................................................................................................................................. 1 - 1
Description of the 845 Transformer Protection Relay.................................................... 1 - 2
Security Overview............................................................................................................................ 1 - 6
845 Order Codes............................................................................................................................... 1 - 8
Specifications...................................................................................................................................1 - 10
Protection...................................................................................................................................................1 - 10
Control.........................................................................................................................................................1 - 17
Monitoring..................................................................................................................................................1 - 17
Recording...................................................................................................................................................1 - 19
User-Programmable Elements ........................................................................................................1 - 19
Metering......................................................................................................................................................1 - 20
Inputs ...........................................................................................................................................................1 - 22
Outputs........................................................................................................................................................1 - 23
Power Supply............................................................................................................................................1 - 24
Communications ....................................................................................................................................1 - 24
Testing & Certification..........................................................................................................................1 - 25
Physical .......................................................................................................................................................1 - 26
Environmental..........................................................................................................................................1 - 26
Cautions and Warnings ..............................................................................................................1 - 26
Safety words and definitions ............................................................................................................1 - 26
General Cautions and Warnings.....................................................................................................1 - 27
Must-read Information................................................................................................................1 - 28
For Further Assistance.................................................................................................................1 - 29
2.INSTALLATION
Mechanical Installation................................................................................................................. 2 - 1
Product Identification..............................................................................................................................2 - 1
Dimensions...................................................................................................................................................2 - 1
Mounting .......................................................................................................................................................2 - 2
Standard Panel Mount.............................................................................................................................2 - 3
Draw-out Unit Withdrawal and Insertion ......................................................................................2 - 4
Removable Power Supply......................................................................................................................2 - 5
Removable Magnetic Module..............................................................................................................2 - 6
Electrical Installation ...................................................................................................................... 2 - 7
Terminal Identification.........................................................................................................................2 - 12
Wire Size......................................................................................................................................................2 - 16
Phase Sequence and Transformer Polarity ...............................................................................2 - 16
Ground CT Inputs....................................................................................................................................2 - 17
Voltage Inputs..........................................................................................................................................2 - 17
Restricted Earth Fault Inputs ............................................................................................................2 - 18
Zero-Sequence CT Installation.........................................................................................................2 - 18
Control Power...........................................................................................................................................2 - 19
Contact Inputs .........................................................................................................................................2 - 20
Output Relays...........................................................................................................................................2 - 20
Serial Communications .......................................................................................................................2 - 22
IRIG-B ...........................................................................................................................................................2 - 23
3.INTERFACES
Front Control Panel Interface..................................................................................................... 3 - 2
845 Graphical Display Pages..............................................................................................................3 - 2
Working with Graphical Display Pages ...........................................................................................3 - 3
LED Status Indicators ..............................................................................................................................3 - 6
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