Siemens 7UT51

7UT51 v3 Contents
PRIM-2330C 3
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
2.2.10 Configuration & Analysis Software (WinDIGSI
®
) ........................................................................................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