GE Multilin 745

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Table of Contents

745

Generator Management Relay

http://www.GEindustrial.com/multilin

vii

GE Multilin

Voltage Input....................................................................................................................................... 7-7

Transformer Type Selection .............................................................................................................. 7-8

Ambient Temperature Input .............................................................................................................. 7-9

Analog Outputs ................................................................................................................................. 7-11

Tap Position....................................................................................................................................... 7-11

Protection Schemes

Precautions........................................................................................................................................ 7-11

Harmonic Restrained Percent Differential....................................................................................... 7-11

Instantaneous Differential Protection.............................................................................................. 7-17

Phase Time Overcurrent................................................................................................................... 7-18

Phase Instantaneous Overcurrent 1 ................................................................................................ 7-20

Phase Instantaneous Overcurrent 2 ................................................................................................ 7-20

Neutral Time Overcurrent ................................................................................................................ 7-21

Neutral Instantaneous Overcurrent 1.............................................................................................. 7-22

Neutral Instantaneous Overcurrent 2.............................................................................................. 7-23

Ground Time Overcurrent................................................................................................................ 7-23

Ground Instantaneous Overcurrent 1.............................................................................................. 7-25

Ground Instantaneous Overcurrent 2.............................................................................................. 7-26

Restricted Ground Fault Polarity Test ............................................................................................. 7-26

Restricted Ground Fault Element Test ............................................................................................ 7-27

Negative Sequence Time Overcurrent............................................................................................ 7-28

Negative Sequence Instantaneous Overcurrent............................................................................. 7-30

Frequency.......................................................................................................................................... 7-31

Overexcitation ................................................................................................................................... 7-36

Insulation Aging ................................................................................................................................ 7-37

Tap Monitor Failure .......................................................................................................................... 7-38

Auxiliary Protection and Monitoring Functions

THD Level Scheme............................................................................................................................ 7-38

Harmonic Derating Function............................................................................................................ 7-39

Transformer Overload ...................................................................................................................... 7-40

Placing the Relay Into Service

Precautions........................................................................................................................................ 7-40

Procedure .......................................................................................................................................... 7-40

APPENDIX Change Notes

Revision History .................................................................................................................................. 8-1

Changes to the 745 Manual ............................................................................................................... 8-1

EU Declaration of Conformity

GE Multilin Warranty

Warranty Statement ........................................................................................................................... 8-3

INDEX