845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL I
Table of Contents
1.INTRODUCTION Overview .............................................................................................................................................. 1 - 1
Description of the 845 Transformer Protection Relay.................................................... 1 - 2
Security Overview............................................................................................................................ 1 - 7
845 Order Codes............................................................................................................................... 1 - 8
Specifications...................................................................................................................................1 - 10
Device .......................................................................................................................................................... 1 - 10
Protection................................................................................................................................................... 1 - 10
Control......................................................................................................................................................... 1 - 17
Monitoring.................................................................................................................................................. 1 - 18
Recording................................................................................................................................................... 1 - 19
User-Programmable Elements ........................................................................................................ 1 - 20
Metering...................................................................................................................................................... 1 - 21
Inputs ........................................................................................................................................................... 1 - 23
Outputs........................................................................................................................................................ 1 - 25
Power Supply ........................................................................................................................................... 1 - 26
Communications .................................................................................................................................... 1 - 27
Testing & Certification.......................................................................................................................... 1 - 28
Physical....................................................................................................................................................... 1 - 29
Environmental.......................................................................................................................................... 1 - 29
Cautions and Warnings ..............................................................................................................1 - 30
Safety words and definitions............................................................................................................ 1 - 30
General Cautions and Warnings..................................................................................................... 1 - 30
Must-read Information................................................................................................................1 - 33
Storage........................................................................................................................................................ 1 - 34
For Further Assistance.................................................................................................................1 - 34
Repairs......................................................................................................................................................... 1 - 34
2.INSTALLATION Mechanical Installation................................................................................................................. 2 - 1
Product Identification..............................................................................................................................2 - 1
Dimensions...................................................................................................................................................2 - 2
Mounting .......................................................................................................................................................2 - 3
Standard Panel Mount.............................................................................................................................2 - 4
Depth Reducing Collar.............................................................................................................................2 - 5
Draw-out Unit Withdrawal and Insertion ......................................................................................2 - 7
Removable Power Supply .....................................................................................................................2 - 8
Removable Magnetic Module..............................................................................................................2 - 9
Arc Flash Sensor ..................................................................................................................................... 2 - 10
Sensor Fiber Handling & Storage....................................................................................................2 - 10
Sensor Installation..................................................................................................................................2 - 10
Electrical Installation ....................................................................................................................2 - 11
Typical Wiring Diagrams .................................................................................................................... 2 - 11
Terminal Identification......................................................................................................................... 2 - 16
Wire Size......................................................................................................................................................2 - 20
Phase Sequence and Transformer Polarity............................................................................... 2 - 21
Ground CT Inputs.................................................................................................................................... 2 - 21
Voltage Inputs.......................................................................................................................................... 2 - 22
Restricted Earth Fault Inputs ............................................................................................................ 2 - 22
Zero-Sequence CT Installation......................................................................................................... 2 - 23
Control Power........................................................................................................................................... 2 - 24
Contact Inputs ......................................................................................................................................... 2 - 24
Output Relays .......................................................................................................................................... 2 - 25
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