GE 350-A9

CHAPTER 6: SETPOINTS S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–47
Figure 6-20: Phase directional logic diagram
898840.cdr
SETPOINT
BLOCK 1: Off = 0 BLOCK 2: Off = 0 BLOCK 3: Off = 0
OR
Ph Dir OC REV (A) (To Phase IOC 1, 2 and TOC )
SETPOINT:
Do Not Operate, Operate
OUTPUT RELAY X
SETPOINT
PH DIR MTA
Ia > 0.05 x CT
AND
AND
ACTUAL VALUES
Ia Seq = ABC Seq = ACB Vbc Vcb
Voltage Polarization
Vpol
FWD
REV
RUN
SETPOINT
PHASE DIR OC POLAR VOLTAGE TRESHOLD
V>= V minimum
SETPOINT
BLK POC DIR UNDEF Enabled Disabled
PHASE B LOGIC SIMILAR TO PHASE A PHASE C LOGIC SIMILAR TO PHASE A
AND
AND
BLK PHOC DIR UND (A)
(To Phase IOC 1, 2 and TOC)
(Message)
SETPOINT
PHA DIR FUNCTION: Disabled = 0 Latched Alarm Alarm
OR
Control
OR
AND
RESET
AND
S R
LATCH
Ph Dir OC FWD (A) (To Phase IOC 1, 2 and TOC )
(Message) (Flexlogic)
AND
(Event Recorder , Trasient Recorder )
(Flexlogic)
(Event Recorder , Trasient Recorder )
898840A1.CDR