GE 889 - Page 368

4–238 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION CHAPTER 4: SETPOINTS
Figure 4-90: Negative Sequence Overvoltage Protection logic diagram
SETPOINTS
SETPOINT
FUNCTION: Disabled
Trip
PICKUP:
AND
Operate Output Relay 1 (TRIP)
LED: PICKUP
LED: TRIP
Alarm
OR
OR
AND
Latched Alarm
AND
SETPOINTS
BLOCK: Off = 0
LED: ALARM /
LATCHED ALARM
RESET
Command
AND
S R
LATCH
Configurable
FlexLogic Operands
Neg Seq OV 1 OP: Neg Seq OV 1 PKP:
SETPOINTS
PICK-UP DELAY: DROP-OUT DELAY:
t PKP
t RST
V_2 > PICKUP
RUN
SETPOINTS
Do Not Operate, Operate OUTPUT RELAYS 3 to 7
SETPOINTS
Signal Input Ph VT Bank 1 – J2
Phase A Voltage (Va) Phase B Voltage (Vb) Phase C Voltage (Vc)
Phase Voltages
850 Only
894051A2.cdr