GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 111

5 SETPOINTS
c) GROUND INSTANTANEOUS OVERCURRENT
PATH: SETPOINTS S4 ELEMENTS
W1 GND INST OC 1
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• W1(3) GROUND INST OC 1(2) PICKUP: Enter the level of ground current (in units of relay nominal current) above
which the Winding 1(3) Ground Instantaneous Overcurrent 1 element will pickup and start the delay timer.
• W1(3) GROUND INST OC 1(2) DELAY: Enter the time that the ground current must remain above the pickup level
before the element operates.
The messages above and scheme logic below are identical for Windings 2 and 3 of Ground Instantaneous
Overcurrent 1 and all windings on the Ground Instantaneous Overcurrent 2 element.
NOTE
GE Multilin
Courtesy of NationalSwitchgear.com
NEUTRAL OC W1(3) NTRL INST OC 1(2)
ð
W1 GROUND INST OC 1
ENTER
FUNCTION: Disabled
ESCAPE
W1 GROUND INST OC 1
ESCAPE
TARGET: Latched
MESSAGE
W1 GROUND INST OC 1
ESCAPE
PICKUP: 10.00 x CT
MESSAGE
W1 GROUND INST OC 1
ESCAPE
DELAY: 0 ms
MESSAGE
W1 GROUND INST OC 1
ESCAPE
BLOCK: Disabled
MESSAGE
Figure 5–20: GROUND IOC 1 SCHEME LOGIC
745 Transformer Management Relay
5.6 S4 ELEMENTS
Range: Enabled, Disabled
Range: Self-Reset, Latched, None
Range: 0.05 to 20.00 x CT in steps of 0.01
Range: 0 to 60000 ms in steps of 1
Range: Logc Inpt 1 to 16, Virt Inpt 1 to 16, Output Rly 2 to
8, SelfTest Rly, Vir Outpt 1 to 5, Disabled
5
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