GE 745 Instruction Manual page 164

S4 ELEMENTS
5.6.6.3 Neutral Instantaneous Overcurrent

W1 NTRL []
INST OC 1
Note
NOTE
5–68
PATH: SETPOINTS S4 ELEMENTS

W1 NEUTRAL INST OC 1
FUNCTION: Enabled
W1 NEUTRAL INST OC 1
MESSAGE
RLYS (1-8): --------
W1 NEUTRAL INST OC 1
MESSAGE
TARGET: Latched
W1 NEUTRAL INST OC 1
MESSAGE
PICKUP: 10.00 x CT
W1 NEUTRAL INST OC 1
MESSAGE
DELAY:
W1 NEUTRAL INST OC 1
MESSAGE
BLOCK: Disabled
• 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.
FIGURE 5–19: Neutral instantaneous overcurrent scheme logic
NEUTRAL OC W1(3) NTRL INST OC 1(2)
 
Range:
Range:
Range:
Range:
Range:
0 ms
Range:
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
Enabled, Disabled
1 to 8
Self-Reset, Latched, None
0.05 to 20.00 x CT in steps of
0.01
0 to 60000 ms in steps of 1
Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled