Ground Alarm And Trip - GE 239 Instruction Manual

7.6.2

Ground Alarm And Trip

7–102
Courtesy of NationalSwitchgear.com
1. Alter the following setpoints:
S2: SYSTEM SETUP\CT INPUTS\GROUND SENSING:
S2: SYSTEM SETUP\CT INPUTS\PHASE CT PRIMARY:
S4: PROTECTION\GROUND CURRENT\GROUND TRIP:
S4: PROTECTION\GROUND CURRENT\GROUND PRIMARY TRIP PICKUP:
S4: PROTECTION\GROUND CURRENT\GROUND ALARM:
S4: PROTECTION\GROUND CURRENT\GROUND PRIMARY ALARM PICKUP:
2. While viewing A2: METERING\CURRENT\GROUND CURRENT
into the 5A ground input. The ALARM LED will become lit and the alarm relay will
change state at one half the trip setting; i.e. at a displayed Ground Fault current of 40
A (40% of
PHASE CT PRIMARY
3. With the display showing GROUND ALARM message, change the display to
METERING\ CURRENT\GROUND CURRENT
When the display current of 80 A (80% of
relay will activate and the TRIP LED will become lit. The 239 will display CAUSE OF LAST
TRIP: GROUND FAULT message.
4. Turn the ground current off and press the reset key to reset the trip relay.
RESIDUAL
100
TRIP
setting).
and continue increasing the input current.
PHASE CT PRIMARY
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
CHAPTER 7: TESTING
80%
MOMENTARY
40%
, begin injecting current
A2:
) is reached, the 239 trip