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

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