GE 745 TRANSFORMER MANAGEMENT RELAY User Manual

iv
745 Transformer Management Relay
GE Power Management
TABLE OF CONTENTS
b RESTRICTED GROUND FAULT SETTINGS EXAMPLE........................ 5-61
c SETPOINTS............................................................................................. 5-62
5.6.10 NEGATIVE SEQUENCE OVERCURRENT............................................. 5-63
a WINDING 1 (2/3) NEGATIVE SEQUENCE TIME OVERCURRENT....... 5-63
b WINDING 1 (2/3) NEG. SEQ. INSTANTANEOUS OVERCURRENT...... 5-64
5.6.11 FREQUENCY .......................................................................................... 5-65
a UNDERFREQUENCY 1 (2) ..................................................................... 5-65
b FREQUENCY DECAY............................................................................. 5-66
c OVERFREQUENCY ................................................................................ 5-67
5.6.12 OVEREXCITATION ................................................................................. 5-68
a 5TH HARMONIC LEVEL ......................................................................... 5-68
b VOLTS-PER-HERTZ 1 (2)....................................................................... 5-69
5.6.13 HARMONICS........................................................................................... 5-70
a WINDING 1 (2/3) THD LEVEL................................................................. 5-70
b WINDING 1 (2/3) HARMONIC DERATING ............................................. 5-71
5.6.14 INSULATION AGING / LOSS OF LIFE FEATURE.................................. 5-72
a DESCRIPTION ........................................................................................ 5-72
b HOTTEST-SPOT LIMIT........................................................................... 5-72
c INSULATION AGING SETPOINTS ......................................................... 5-73
5.6.15 AGING FACTOR LIMIT ........................................................................... 5-74
5.6.16 LOSS OF LIFE LIMIT............................................................................... 5-75
5.6.17 ANALOG INPUT ...................................................................................... 5-76
a ANALOG LEVEL 1 (2) ............................................................................. 5-76
5.6.18 CURRENT DEMAND............................................................................... 5-77
5.6.19 TRANSFORMER OVERLOAD ................................................................ 5-78
5.6.20 TAP CHANGER FAILURE....................................................................... 5-79
5.7 S5 OUTPUTS
5.7.1 DESCRIPTION ........................................................................................ 5-80
5.7.2 INTRODUCTION TO FLEXLOGIC™....................................................... 5-80
5.7.3 FLEXLOGIC™ RULES ............................................................................ 5-82
5.7.4 OUTPUT RELAYS...................................................................................5-84
5.7.5 TRACE MEMORY.................................................................................... 5-85
5.7.6 VIRTUAL OUTPUTS................................................................................ 5-85
5.7.7 TIMERS ................................................................................................... 5-86
5.8 S6 TESTING
5.8.1 DESCRIPTION ........................................................................................ 5-87
5.8.2 OUTPUT RELAYS...................................................................................5-87
5.8.3 ANALOG OUTPUTS................................................................................ 5-87
5.8.4 SIMULATION........................................................................................... 5-88
5.8.5 PREFAULT VALUES............................................................................... 5-89
5.8.6 FAULT VALUES ...................................................................................... 5-90
5.8.7 FACTORY SERVICE............................................................................... 5-90
5.9 TIME OVERCURRENT CURVES
5.9.1 NOTE....................................................................................................... 5-91
5.9.2 ANSI CURVES......................................................................................... 5-91
5.9.3 DEFINITE TIME CURVE ......................................................................... 5-93
5.9.4 IEC CURVES........................................................................................... 5-93
5.9.5 IAC CURVES........................................................................................... 5-95
5.10 INVERSE VOLTS-PER-HERTZ CURVES
5.10.1 INVERSE CURVE 1................................................................................. 5-97
5.10.2 INVERSE CURVE 2................................................................................. 5-98
5.10.3 INVERSE CURVE 3................................................................................. 5-99
6. ACTUAL VALUES
6.1 OVERVIEW
6.1.1 DESCRIPTION .......................................................................................... 6-1

GE 745 TRANSFORMER MANAGEMENT RELAY Specifications

General

Brand	GE
Model	745 TRANSFORMER MANAGEMENT RELAY
Category	Relays
Language	English