GE 845 - Page 280

4–152 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION CHAPTER 4: SETPOINTS
Figure 4-51: Transformer Overload Logic Diagram
SETPOINT
W1 load
RUN
SETPOINT
FUNCTION Disabled Trip
PICKUP
AND
W2 load W3 load
RUN RUN
TRIP
LED: PICKUP
Alarm
OR
OR
AND
Latched Alarm
AND
SETPOINT
BLOCK Off = 0
W2 load >= PICKUP
W1 load >= PICKUP W3 load >= PICKUP
SETPOINT
t
PKP
OR
LED:
ALARM
RESET
Command
AND
S R
LATCH
Configurable
SETPOINTS
OUTPUT RELAYS Do Not Operate, Operate
0
PICKUP DELAY:
LED: TRIP
Set
Dominant
Overload PKP
FlexLogic Operands
Overload OP
FlexLogic Operands
ACTUAL VALUES
SETPOINT
Overtemp Input Operand X = 1, Off = 0
FlexLogic operand status
AND
OR
W1 OverloadPKP
FlexLogic Operands
W2 OverloadPKP
FlexLogic Operands
W3 OverloadPKP
FlexLogic Operands
894008A2.cdr