GE 845 - Page 379

CHAPTER 4: SETPOINTS MONITORING
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–251
Figure 4-97: Tap Changer Failure logic diagram
894004$1.cdr
System/Transformer/
Onload Tap Changer
TC Position
RUN
SETPOINT
FUNCTION Disabled
Max Tap Position
AND
Alarm
OR
OR
AND
Latched Alarm
AND
SETPOINT
BLOCK Off = 0
TC Position > Max Tap Position
SETPOINT
t
PKP
LED: ALARM
RESET
Command
S R
LATCH
Configurable
SETPOINTS
OUTPUT RELAYS Do Not Operate, Operate
0
DELAY
Set
Dominant
Tap Ch Fail PKP
FlexLogic Operands
Tap Ch Fail OP
FlexLogic Operands
ACTUAL VALUE
LED: PICKUP
Metering/
Transformer/Tap
Changer Position
System/Transformer/
Onload Tap Changer
RUN
Min Tap Position
TC Position < Min Tap
Position
OR