GE 339

CHAPTER 6: SETPOINTS S3 PROTECTION
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 6–117
Figure 6-49: Directional power logic diagram
SETPOINT
= Disabled
= Alarm
FUNCTION
= Latched Alarm
= Control
=Trip
LED: ALARM
OR
Volatile, Reset-dominant
Latch
S R
AND AND
RESET
Command
AND
LED: TRIP
Operate Output Relay1 (TRIP) Trip (to Breaker Failure)
OR
SETPOINTS
=On
BLOCK1:
=On
BLOCK2:
=On
BLOCK3:
OR
AND
SETPOINT PICKUP DELAY:
0
T
PKP
SETPOINTS
OUTPUT RELAY X
Do Not Operate, Operate
LED: PICKUP
Message Event Recorder
Transient Recorder
Message
Event Recorder
Transient Recorder
SETPOINTS
RUN
P cosΘ + Q sinΘ > SMIN RCA(Θ)
Real Power (P) Reactive Power (Q)
Calculated by relay
SMIN
Pos Seq current(I_1)
Calculated by relay
I_1 < 0.02 x CT
AND
898851A1.CDR