Ground Fault - GE 469 Instruction Manual

S6 Current Elements

Ground Fault

GROUND FAULT
NOTE
NOTE
GE Multilin
PATH: SETPOINTS S6 CURRENT ELEM.
[ ] GROUND FAULT
OVERREACH FILTER: Off
GROUND FAULT
MESSAGE
ALARM: Off
ASSIGN ALARM RELAYS:
MESSAGE
Alarm
GROUND FAULT ALARM
MESSAGE
PICKUP: 0.10 x CT
INTENTIONAL GF ALARM
MESSAGE
DELAY: 0 ms
GROUND FAULT ALARM
MESSAGE
EVENTS: Off
GROUND FAULT
MESSAGE
TRIP: Off
ASSIGN TRIP RELAYS:
MESSAGE
Trip
GROUND FAULT TRIP
MESSAGE
PICKUP: 0.20 x CT
INTENTIONAL GF TRIP
MESSAGE
DELAY: 0 ms
GROUND FAULT TRIP
MESSAGE
BACKUP: Off
ASSIGN BACKUP
MESSAGE
RELAYS: Auxiliary2
GROUND FAULT TRIP
MESSAGE
BACKUP DELAY: 200 ms
The
GROUND FAULT ALARM PICKUP
in units of '× CT' if the Ground CT is programmed as 1 A or 5 A Secondary or in units
of 'A' is the Ground CT is programmed as "50:0.025".
The Ground Fault element functions as follows. Once the ground current magnitude
exceeds the Pickup Level ×
for the time specified by the delay, a trip and/or alarm will occur. There is also a
backup trip feature that can be enabled. If the
and a Ground Fault trip has initiated, a second trip will occur if the ground current
persists longer than the
GROUND FAULT TRIP BACKUP DELAY
second trip be assigned to 2 Auxiliary or 3 Auxiliary, which would be dedicated as an
upstream breaker trip relay. The
time longer than the breaker clearing time. Whenever the output relay assigned to
the backup trip operates, it will stay latched regardless of how the trip relay is
configured for the Ground Fault element.
Care must be taken when turning On this feature. If the interrupting device
(contactor or circuit breaker) is not rated to break ground fault current
(low resistance or solidly grounded systems), the feature should be
disabled. Alternately, the feature may be assigned to an auxiliary relay and
connected such that it trips an upstream device that is capable of breaking
the fault current.
Various situations (e.g. contactor bounce) may cause transient ground currents
during motor starting that may exceed the Ground Fault pickup levels for a very
short period of time. The Ground Fault time delays are adjustable in 10 ms
http://www.GEindustrial.com/multilin
GROUND FAULT
Range: On, Off
Range: Off, Latched, Unlatched
Range: Alarm, Alarm & Auxiliary2,
Range: 0.1 to 1.00 x CT in steps of 0.01
Range: 0 to 1000 ms in steps of 1
Range: On, Off
Range: Off, Latched, Unlatched
Range: Trip, Trip & Auxiliary2, Trip &
Range: 0.1 to 1.00 x CT in steps of 0.01
Range: 0 to 1000 ms in steps of 1
Range: On, Off
Range: Auxiliary2,
Range: 10 to 2000 ms in steps of 10
and
GROUND FAULT TRIP PICKUP
(see Current Sensing on page 5–14)
GROUND CT PRIMARY
GROUND FAULT TRIP BACKUP
GROUND FAULT TRIP BACKUP DELAY
469
Motor Management Relay
Alarm & Aux2 & Aux3,
Auxiliary2, Aux2 & Aux3,
Auxiliary3
or 0.25 to 25 A in steps of 0.01
Aux2 & Aux3, Trip & Auxiliary3,
Auxiliary2, Aux2 & Aux3,
Auxiliary3
or 0.25 to 25 A in steps of 0.01
Aux2 & Aux3,
Auxiliary3
setpoint are entered
is "On",
. It is intended that this
must be set to a
5–53