GE 745 - Page 7

745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL TOC–V
TEST EQUIPMENT ................................................................................................................. 7-3
PRELIMINARY WORK ...................................................................................................................... 7-5
D
ESCRIPTION ........................................................................................................................ 7-5
D
IELECTRIC STRENGTH TESTING ....................................................................................... 7-6
LOGIC INPUTS AND OUTPUT RELAYS ...................................................................................... 7-7
L
OGIC INPUTS ...................................................................................................................... 7-7
O
UTPUT RELAYS .................................................................................................................. 7-8
METERING ........................................................................................................................................... 7-9
D
ESCRIPTION ........................................................................................................................ 7-9
C
URRENT INPUTS ................................................................................................................. 7-9
V
OLTAGE INPUT ................................................................................................................... 7-10
T
RANSFORMER TYPE SELECTION ....................................................................................... 7-11
A
MBIENT TEMPERATURE INPUT ......................................................................................... 7-13
A
NALOG OUTPUTS ............................................................................................................... 7-14
T
AP POSITION ...................................................................................................................... 7-15
PROTECTION SCHEMES ................................................................................................................. 7-16
P
RECAUTION ......................................................................................................................... 7-16
H
ARMONIC RESTRAINED PERCENT DIFFERENTIAL .......................................................... 7-16
I
NSTANTANEOUS DIFFERENTIAL PROTECTION ................................................................. 7-23
P
HASE TIME OVERCURRENT ............................................................................................... 7-25
P
HASE INSTANTANEOUS OVERCURRENT 1 ...................................................................... 7-27
P
HASE INSTANTANEOUS OVERCURRENT 2 ...................................................................... 7-28
N
EUTRAL TIME OVERCURRENT .......................................................................................... 7-29
N
EUTRAL INSTANTANEOUS OVERCURRENT 1 ................................................................. 7-31
N
EUTRAL INSTANTANEOUS OVERCURRENT 2 ................................................................. 7-32
G
ROUND TIME OVERCURRENT .......................................................................................... 7-32
G
ROUND INSTANTANEOUS OVERCURRENT 1 .................................................................. 7-35
G
ROUND INSTANTANEOUS OVERCURRENT 2 .................................................................. 7-36
R
ESTRICTED GROUND FAULT POLARITY TEST ................................................................. 7-36
R
ESTRICTED GROUND FAULT ELEMENT TEST .................................................................. 7-37
N
EGATIVE-SEQUENCE TIME OVERCURRENT ..................................................................... 7-39
N
EGATIVE-SEQUENCE INSTANTANEOUS OVERCURRENT ................................................ 7-42
F
REQUENCY .......................................................................................................................... 7-43
O
VEREXCITATION ................................................................................................................. 7-52
I
NSULATION AGING ............................................................................................................. 7-54
T
AP MONITOR FAILURE ...................................................................................................... 7-55
AUXILIARY PROTECTION AND MONITORING FUNCTIONS ............................................. 7-56
THD L
EVEL SCHEME .......................................................................................................... 7-56
H
ARMONIC DERATING FUNCTION ..................................................................................... 7-57
T
RANSFORMER OVERLOAD ................................................................................................. 7-58
PLACING THE RELAY INTO SERVICE ......................................................................................... 7-60
P
RECAUTIONS ....................................................................................................................... 7-60
P
ROCEDURE .......................................................................................................................... 7-60
A: APPENDIX CHANGE NOTES ................................................................................................................................ A-1
R
EVISION HISTORY .............................................................................................................. A-1
C
HANGES TO THE 745 MANUAL ...................................................................................... A-2
EU DECLARATION OF CONFORMITY ........................................................................................ A-5
EU D
ECLARATION ............................................................................................................... A-5
GE DIGITAL ENERGY WARRANTY .............................................................................................. A-6
W
ARRANTY STATEMENT ..................................................................................................... A-6