GE 745 - Page 310

vi 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
INDEX CHAPTER B: INDEX
O
ONLOAD TAP CHANGER..................................................................................5-37
OPERATING TIME .............................................................................................7-18
ORDER CODES....................................................................................................2-3
OUTPUT RELAYS
commissioning ...........................................................................................7-7, 7-8
default FlexLogic™ ........................................................................................ 5-103
description.......................................................................................................3-16
setpoints............................................................................................. 5-102, 5-107
specifications ....................................................................................................2-9
typical wiring...................................................................................................3-16
OVERCURRENT
ground instantaneous .....................................................................................5-71
ground time .....................................................................................................5-70
negative sequence instantaneous ..................................................................5-77
negative sequence time ..................................................................................5-76
neutral instantaneous .....................................................................................5-68
neutral time .....................................................................................................5-66
phase...............................................................................................................5-58
OVERCURRENT CURVES
definite time ....................................................................................................5-59
FlexCurves™ .................................................................................................... 5-59
IEEE..................................................................................................................5-60
OVEREXCITATION
5th harmonic level...........................................................................................5-84
description.......................................................................................................5-83
setpoints..........................................................................................................5-84
specifications ....................................................................................................2-8
volts-per-hertz.................................................................................................5-85
OVERFREQUENCY
setpoints..........................................................................................................5-82
specifications ....................................................................................................2-8
testing ............................................................................................................. 7-47
OVERVIEW ..........................................................................................................2-1
P
PANEL CUTOUT..................................................................................................3-2
PASSCODE
changing ......................................................................................... 1-9, 1-10, 1-11
security ....................................................................................................1-9, 1-10
setpoints..........................................................................................................5-25
PERCENT DIFFERENTIAL
dual-slope characteristic ................................................................................5-50
harmonic restrained........................................................................................7-16
operating principle ..........................................................................................5-49
setpoints..........................................................................................................5-49
specifications ....................................................................................................2-6
zones of protection .........................................................................................5-74
PHASE A INDICATOR .........................................................................................4-3
PHASE ANGLE CORRECTION ..........................................................................5-10
PHASE B INDICATOR .........................................................................................4-3
PHASE C INDICATOR .........................................................................................4-3
PHASE INSTANTANEOUS OVERCURRENT
setpoints..........................................................................................................5-65