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P
PANEL CUTOUT ......................................................... 3-1
PASSCODE
changing ................................................................... 2-6
security ...............................................................2-6, 2-7
setpoints ..................................................................5-24
PERCENT DIFFERENTIAL
dual-slope characteristic ...........................................5-47
harmonic restrained ................................................ 10-14
logic diagram ............................................................ 7-2
operating principle ....................................................5-47
setpoints ..................................................................5-46
zones of protection ...................................................5-60
PHASE A INDICATOR ................................................. 4-4
PHASE ANGLE CORRECTION ..................................... 5-8
PHASE B INDICATOR ................................................. 4-4
PHASE C INDICATOR ................................................. 4-4
PHASE INSTANTANEOUS OVERCURRENT
logic diagrams ................................................... 7-9, 7-10
setpoints ..................................................................5-54
testing ........................................................ 10-23, 10-24
PHASE OVERCURRENT ............................................5-52
PHASE SEQUENCE .................................................... 3-8
PHASE SHIFTS ..........................................................5-23
description ...............................................................5-23
three-phase transformers ........................................... 5-6
PHASE TIME OVERCURRENT
logic diagram ............................................................ 7-8
setpoints ..................................................................5-52
testing ................................................................... 10-21
PHASORS
ABC sequence .......................................................... 5-6
ACB sequence .......................................................... 5-7
PICKUP INDICATOR ................................................... 4-4
PLACING THE RELAY INTO SERVICE ...................... 10-46
POSITIVE SEQUENCE CURRENT ............................... 6-5
POWER .....................................................................6-11
PREFAULT VALUES ...................................................5-89
PREFERENCES .........................................................5-25
PRODUCT INFO .........................................................6-17
PROGRAM PORT ........................................................ 4-4
PROTECTION ELEMENTS
specifications ............................................................ 1-6
target messages .......................................................6-20
PROTECTION SCHEMES
5th harmonic ................................................. 5-68, 10-41
energization detection ............................................ 10-19
features .................................................................... 1-2
frequency decay .......................................................5-66
frequency decay rate ................................... 10-39, 10-40
ground instantaneous o/c ..........................................5-58
ground instantaneous overcurrent ................ 10-28, 10-29
ground time o/c ........................................................5-57
ground time overcurrent .......................................... 10-27
harmonic restrained percent differential ................... 10-14
instantaneous differential ............................... 5-52, 10-20
insulation aging ............................................. 5-73, 10-42
negative sequence instantaneous o/c ........................5-64
negative sequence instantaneous overcurrent ......... 10-33
negative sequence time o/c ......................................5-63
negative sequence time overcurrent ........................ 10-31
neutral instantaneous o/c ..........................................5-56
iv
neutral instantaneous overcurrent ................ 10-26, 10-27
neutral time o/c ........................................................ 5-55
neutral time overcurrent .......................................... 10-24
overfrequency ............................................... 5-67, 10-37
phase instantaneous o/c ........................................... 5-54
phase instantaneous overcurrent ................. 10-23, 10-24
phase time o/c ......................................................... 5-52
phase time overcurrent ........................................... 10-21
restricted ground ...................................................... 5-59
restricted ground fault ............................................ 10-30
THD level ...................................................... 5-70, 10-43
underfrequency ...................................5-65, 10-35, 10-37
volts-per-hertz ............................................... 5-69, 10-41
R
REAR TERMINAL ASSIGNMENTS ................................3-5
REAR TERMINAL LAYOUT ...........................................3-4
RELAY INSERTION ......................................................3-3
RELAY WITHDRAWAL ..................................................3-2
REMOTE RESET MODE ........................................... 10-15
RESET KEY .................................................................4-6
RESETTING ............................................................... 5-28
RESISTANCE GROUNDED WYE WINDING ................. 5-59
RESTRAINT CURRENT ................................................6-6
RESTRICTED GROUND
implementation ......................................................... 5-61
logic ........................................................................ 7-17
setpoints .................................................................. 5-59
settings example ...................................................... 5-61
testing ................................................................... 10-30
zones of protection ................................................... 5-60
REVISION CODES ..................................................... 6-17
RS232 COMMUNICATIONS ................................. 3-13, 9-4
RS422 COMMUNICATIONS ............................... 3-12, 3-13
RS485 COMMUNICATIONS ................................. 3-12, 9-4
RTD
calibration .............................................................. 10-11
driver/sensor ............................................................ 3-10
measured temperature ........................................... 10-12
resistance vs. temperature ........................................ 5-39
S
S1 745 SETUP .................................................. 5-24, 11-1
S2 SYSTEM SETUP .......................................... 5-33, 11-2
S3 LOGIC INPUTS ............................................ 5-43, 11-5
S4 ELEMENTS .................................................. 5-45, 11-6
S5 OUTPUTS .................................................. 5-80, 11-18
S6 TESTING .............................................................. 5-87
SCHEME LOGIC ..........................................................7-1
SCRATCHPAD ........................................................... 5-30
SELF-TEST ERROR INDICATOR ..................................4-2
SELF-TEST ERRORS ................................. 6-3, 6-21, 6-22
SELF-TEST RELAY .................................................... 7-31
SERVICING .............................................................. 10-46
SETPOINT ENTRY .......................................................5-2
SETPOINT GROUP .................................................... 5-46
SETPOINT GROUP 1 INDICATOR ................................4-3
SETPOINT GROUP 2 INDICATOR ................................4-3
SETPOINT GROUP 3 INDICATOR ................................4-3
SETPOINT GROUP 4 INDICATOR ................................4-3
745 Transformer Management Relay
GE Power Management
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