GE MI-869 - Page 343

CHAPTER 4: SETPOINTS PROTECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–225
Figure 4-78: Neutral Overvoltage Protection logic diagram
SETPOINTS
3_V0
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
Neutral OV 1 OP : Neutral OV 1 PKP :
SETPOINTS
PICK-UP DELAY: DROP-OUT DELAY:
t PKP
t RST
Van > 0.85 x VT Vbn > 0.85 x VT Vcn > 0.85 x VT
OR
3_Vo > PICKUP
RUN
CURVE:
SETPOINTS
Do Not Operate, Operate RELAYS
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