GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 108

5.6 S4 ELEMENTS
c) NEUTRAL INSTANTANEOUS OVERCURRENT
PATH: SETPOINTS S4 ELEMENTS
W1 NTRL INST OC 1
[ENTER] for more
• W1(3) NEUTRAL INST OC 1(2) PICKUP: Enter the level of neutral current (in units of relay nominal current) above
which the Winding 1(3) Neutral Instantaneous Overcurrent 1 element will pickup and start the delay timer.
• W1(3) NEUTRAL INST OC 1(2) DELAY: Enter the time that the neutral current must remain above the pickup level
before the element operates.
The setpoint messages above and the following logic diagram are identical for the Neutral Instantaneous
Overcurrent 2 element.
NOTE
5
5-58
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NEUTRAL OC W1(3) NTRL INST OC 1(2)
ð
W1 NEUTRAL INST OC 1
ENTER
FUNCTION: Enabled
ESCAPE
W1 NEUTRAL INST OC 1
ESCAPE
TARGET: Latched
MESSAGE
W1 NEUTRAL INST OC 1
ESCAPE
PICKUP: 10.00 x CT
MESSAGE
W1 NEUTRAL INST OC 1
ESCAPE
DELAY: 0 ms
MESSAGE
W1 NEUTRAL INST OC 1
ESCAPE
BLOCK: Disabled
MESSAGE
Figure 5–18: NEUTRAL IOC 1 SCHEME LOGIC
745 Transformer Management Relay
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 SETPOINTS
GE Multilin