Table of Contents
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7UT51 v3
Contents
1
Introduction.................................................................................................................................... 11
1.1
Using This Manual ...................................................................................................................................... 11
1.2
Definitions of Terms .................................................................................................................................... 11
2
Description of Relay...................................................................................................................... 13
2.1
Overview..................................................................................................................................................... 13
2.2
Features ..................................................................................................................................................... 13
2.2.1
Protection Overview ................................................................................................................................... 13
2.2.2
Differential Protection (87T/87HS, 87M/G, 87B)......................................................................................... 14
2.2.3
Overcurrent Protection (50/51, 50HS) ........................................................................................................ 14
2.2.4
Thermal Overload Protection (49-1, 49-2) ..................................................................................................15
2.2.5
Ground Differential Protection (87N) .......................................................................................................... 15
2.2.6
Tank Leakage Protection (64T) .................................................................................................................. 15
2.2.7
Metering...................................................................................................................................................... 15
2.2.8
Commissioning Data ..................................................................................................................................16
2.2.9
Data Acquisition.......................................................................................................................................... 16
2.2.11 Data Communication Ports......................................................................................................................... 16
2.2.12 Control ........................................................................................................................................................ 16
2.2.13 Construction ...............................................................................................................................................17
2.3
Catalog Number ........................................................................................................................................17
2.4
Protection Functions Available At 60Hz...................................................................................................... 18
2.5
Inputs and Outputs ..................................................................................................................................... 18
2.6
Phase Differential Protection of a Transformer (87T and 87HS) ................................................................ 20
2.7
Phase Differential Protection of a Transformer (87T and 87HS) ................................................................ 21
2.8
Phase Differential Protection of a Generator or Motor (87G/M) .................................................................22
2.9
Phase Differential Protection of a Bus (87B) .............................................................................................. 23
2.10
Ground Differential Protection (87N) (Optional with 7UT513) .................................................................... 24
2.11
Overcurrent Protection (50/51 and 50HS) ..................................................................................................25
2.12
Thermal Overload Protection (49-1 and 49-2) ............................................................................................ 26
2.13
Tank Leakage Protection (64T) .................................................................................................................. 27
2.14
Service, Storage, and Transport Conditions............................................................................................... 27
3
Application Examples ................................................................................................................... 31
3.1
Transformer Protection ............................................................................................................................... 31
3.2
Reactor Protection ......................................................................................................................................33
3.3
Motor and Generator Protection ................................................................................................................. 34
3.4
Bus Protection ............................................................................................................................................ 35
PRIM-2330C
®
) ........................................................................................ 16
Contents
3
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