GE Multilin 350 Series

CHAPTER 6: SETPOINTS S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–77
Figure 21: Ground directional logic diagram
Zero Sequence Voltage (-V0)
SETPOINT
GND DIR FUNCTION Disabled = 0
Latched Alarm
SETPOINTS
BLOCK 1 Off = 0 BLOCK 2 Off = 0 BLOCK 3 Off = 0
OR
GND DIR REVERSE
Alarm
OR
OR
REVERSE
(Message)
AND
SETPOINT:
Operate
Output Relays
Upon
Selection
OUTPUT RELAY 4 OUTPUT RELAY 5 OUTPUT RELAY 6 OUTPUT RELAY 3
Control
Ground Current (Ig)
Voltage Polarization
-3V_0
3I_0
FWD
REV
REV
RUN
SETPOINT
GND DIR MTA
SETPOINT
MIN POL VOLTAGE |V0| > MINIMUM
Ig>0.05xCT
AND
AND
AND
Gnd Dir Reverse
(Event Recorder, Transient Recorder)
Direction OK
LED: ALARM
RESET
Command
898018A1.cdr
AND
LATCH
S
R
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