6–84
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION
CHAPTER 6: SETPOINTS
Figure 6-37: Auxiliary Undervoltage logic diagram
Auxiliary V
oltage Input
(Associated setpoints)
SETPOINTS
SETPOINT
AUX UV FUNCTION:
Disabled = 0
Latched
Alarm
AUX UV PICKUP:
AUX UV CUR
VE:
AUX UV DELA
Y:
AND
Operate Output Relay 1 (TRIP)
Event Recorder
LED:
TRIP
Alarm
OR
OR
AND
SETPOINTS
Do Not Operate, Operate
OUTPUT
RELA
Y
X
Trip
AND
Trip (T
o Breaker Failure)
SETPOINTS
BLOCK 1:
Of
f = 0
BLOCK 2:
Of
f = 0
BLOCK 3:
Of
f = 0
OR
RUN
PICKUP
Aux V > Minimum
AUX MIN VOL
TAGE:
SETPOINT
AND
LED: PICKUP
Aux. UV
Trip (Alarm) OP
, PKP
, DPO
Message
LED:
ALARM
RESET
Command
AND
S
R
LA
TCH
898012A2.cdr
Aux V