GE 745 TRANSFORMER MANAGEMENT RELAY

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745 Transformer Management Relay
GE Power Management
TABLE OF CONTENTS
k TARGET, OUTPUT CONTACT, & DISPLAY OPERATION .................. 10-20
l BLOCKING FROM LOGIC INPUTS ...................................................... 10-20
10.6.3 INSTANTANEOUS DIFFERENTIAL PROTECTION ............................. 10-20
a MINIMUM PICKUP ................................................................................ 10-20
b OPERATING TIME ................................................................................ 10-20
c TARGET, OUTPUT CONTACT, & DISPLAY OPERATION .................. 10-21
d BLOCKING FROM LOGIC INPUTS ...................................................... 10-21
10.6.4 PHASE TIME OVERCURRENT ............................................................ 10-21
a WINDING #1 ELEMENTS...................................................................... 10-21
b PICKUP LEVEL ..................................................................................... 10-22
c OPERATING TIME ................................................................................ 10-22
d RESET TIME ......................................................................................... 10-22
e PHASE B AND C ELEMENTS............................................................... 10-22
f WINDING #2 AND #3 ELEMENTS........................................................10-23
10.6.5 PHASE INSTANTANEOUS OVERCURRENT 1 ................................... 10-23
a WINDING #1 ELEMENTS...................................................................... 10-23
b PICKUP LEVEL ..................................................................................... 10-23
c OPERATING TIME ................................................................................ 10-23
d PHASE B AND C ELEMENTS............................................................... 10-23
e WINDING #2 AND #3 ELEMENTS........................................................ 10-24
10.6.6 PHASE INSTANTANEOUS OVERCURRENT 2 ................................... 10-24
10.6.7 NEUTRAL TIME OVERCURRENT........................................................ 10-24
a WINDING #1 ELEMENT........................................................................ 10-24
b PICKUP LEVEL ..................................................................................... 10-24
c OPERATING TIME ................................................................................ 10-25
d RESET TIME ......................................................................................... 10-25
e WINDING #2 OR WINDING #3 ELEMENTS ......................................... 10-25
10.6.8 NEUTRAL INSTANTANEOUS OVERCURRENT 1............................... 10-26
a WINDING #1 ELEMENT........................................................................ 10-26
b PICKUP LEVEL ..................................................................................... 10-26
c OPERATING TIME ................................................................................ 10-26
d WINDING 2 AND 3 ELEMENTS............................................................ 10-26
10.6.9 NEUTRAL INSTANTANEOUS OVERCURRENT 2............................... 10-27
10.6.10 GROUND TIME OVERCURRENT......................................................... 10-27
a WINDING 1 ELEMENT.......................................................................... 10-27
b PICKUP LEVEL ..................................................................................... 10-27
c OPERATING TIME ................................................................................ 10-28
d RESET TIME ......................................................................................... 10-28
e WINDING 2 OR 3 ELEMENTS .............................................................. 10-28
10.6.11 GROUND INSTANTANEOUS OVERCURRENT 1................................ 10-28
a WINDING 1 ELEMENT.......................................................................... 10-28
b PICKUP LEVEL ..................................................................................... 10-29
c OPERATING TIME ................................................................................ 10-29
d WINDING 2 OR ELEMENT.................................................................... 10-29
10.6.12 GROUND INSTANTANEOUS OVERCURRENT 2................................ 10-29
10.6.13 RESTRICTED GROUND FAULT........................................................... 10-30
a WINDING #1 ELEMENT........................................................................ 10-30
b PICKUP LEVEL ..................................................................................... 10-30
c OPERATING TIME ................................................................................ 10-31
d SLOPE................................................................................................... 10-31
e WINDING 2 OR 3 ELEMENTS .............................................................. 10-31
10.6.14 NEGATIVE SEQUENCE TIME OVERCURRENT ................................. 10-31
a WINDING #1 ELEMENT........................................................................ 10-31
b PICKUP LEVEL ..................................................................................... 10-32
c OPERATING TIME ................................................................................ 10-32
d RESET TIME ......................................................................................... 10-33
e WINDINGS 2 AND 3 ELEMENTS.......................................................... 10-33
10.6.15 NEGATIVE SEQUENCE INSTANTANEOUS OVERCURRENT ........... 10-33
a WINDING 1 ELEMENT.......................................................................... 10-33
b PICKUP LEVEL ..................................................................................... 10-33
c OPERATING TIME ................................................................................ 10-34
d WINDING 2 AND 3 ELEMENTS............................................................ 10-34
10.6.16 FREQUENCY ELEMENTS.................................................................... 10-34