4–166 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION CHAPTER 4: SETPOINTS
TARGETS
Range: Self-reset, Latched, Disabled
Default: Self-reset
Figure 4-58: Phase Time Overcurrent Protection logic diagram
894150A1.CDR
SETPOINTS
Phase A current (Ia)
SETPOINT
FUNCTION:
Disabled
Trip
PICKUP:
CURVE:
TDM:
Phase B current (Ib)
Phase C current (Ic)
OR
Operate Output Relay 1 (TRIP)
LED: PICKUP
OR
Alarm
OR
OR
Phase Currents
AND
Latched Alarm
AND
RUN Ia > PICKUP
RUN Ib > PICKUP
RUN Ic > PICKUP
Adjust PICKUP
Adjust PICKUP
Adjust PICKUP
SETPOINTS
BLOCK :
Off = 0
LED: ALARM
RESET
Command
AND
S
R
LATCH
Configurable
FlexLogic Operands
Phase TOC 1 OP
Phase TOC 1 OP:C
Phase TOC 1 OP:B
Phase TOC 1 OP:A
FlexLogic Operands
Phase TOC 1 PKP
Phase TOC 1 PKP C
Phase TOC 1 PKP B
Phase TOC 1 PKP A
SETPOINTS
INPUT:
Phasor, RMS
RESET:
SETPOINTS
OUTPUT RELAYS
Do Not Operate, Operate
LED: TRIP
Set
Dominant
Calculate Voltage
Restraint Multiplier
SETPOINT
VOTAGE RESTRAINT:
Disabled
Enabled
AND
Ph A Reverse (from Phase
Directional OC element)
SETPOINTS
DIRECTION:
Disabled
Forward
Reverse
OR
AND AND
AND AND
Ph B Reverse (from Phase
Directional OC element)
Same Logic as for Phase A
Ph C Reverse (from Phase
Directional OC element)
Same Logic as for Phase A
Phase A Voltage (Va)
Phase B Voltage (Vb)
Phase C Voltage (Vc)
Phase Voltages
RUN SET<V< 0.9pu
SETPOINTS
VOLTAGE LOWER
LIMIT:
SETPOINT
SIGNAL
INPUT:
CT Bank 1 –
J1
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