GE 745 Instruction Manual page 161

CHAPTER 5: SETPOINTS
5.6.5.4 Winding 1 to 3 Phase Instantaneous Overcurrent

W1 PHASE
INST OC 1
Note
NOTE
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
PATH: SETPOINTS

[]
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
• W1(3) PHASE INST OC 1(2) PICKUP: Enter the level of phase current (in units of relay
nominal current) above which the winding 1(3) phase instantaneous overcurrent 1
element will pickup and start the delay timer.
• W1(3) PHASE INST OC 1(2) DELAY: Enter the time that the phase current must remain
above the pickup level before the element operates.
The setpoint messages above and the following logic diagram are identical for the
phase instantaneous overcurrent 2 element.
FIGURE 5–17: Phase instantaneous overcurrent 1 scheme logic
S4 ELEMENTS PHASE OC

W1 PHASE INST OC 1
FUNCTION: Enabled
W1 PHASE INST OC 1
RLYS (1-8): --------
W1 PHASE INST OC 1
TARGET: Latched
W1 PHASE INST OC 1
PICKUP: 10.00 x CT
W1 PHASE INST OC 1
DELAY: 0 ms
W1 PHASE INST OC 1
BLOCK: Disabled
S4 ELEMENTS
W1(3) PHASE INST OC 1(2)

Range: Enabled, Disabled
Range: 1 to 8
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
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