GE Multilin 345 - Page 183

CHAPTER 6: SETPOINTS S3 PROTECTION
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–67
Figure 6-28: Ground/Sensitive Ground Timed Overcurrent Protection logic diagram
SETPOINTS
RUN
SETPOINT
GND TOC FUNCTION Disabled = 0
Alarm
GND TOC PICKUP : GND TOC CURVE : GND TOC TD MULTIPLIER :
Ig > PICKUP
AND
LED: PICKUP
Latched Alarm
OR
Trip
GND TOC RESET :
Ground/Sens Ground current (Ig)
SETPOINTS
BLOCK 1 Off = 0 BLOCK 2 Off = 0 BLOCK 3 Off = 0
OR
GND TOC INPUT :
CT(W1) CT(W2) ground
current selected under
GND TOC INPUT
Message and Event Recorder
GND TOC PKP
LED: TRIP
OR
AND
SETPOINTS
Do Not Operate, Operate
OUTPUT RELAY X
AND
To Breaker Failure
Trip
Message and Event Recorder
LED: ALARM
RESET
Command
AND
S R
LATCH
GND TOC OP
SETPOINTS
( configurable only if “TRIP”
function selected )
Operate trip output relays upon selection
RLY 1 TRIP W1 BKR RLY 2 TRIP W2 BKR
897810A1.cdr