CHAPTER 5: SETTINGS
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
5–65
5.7.6
Ground Fault
PATH: SETTINGS
S6 CURRENT ELEM.
GROUND FAULT
NOTE
Note
The
GROUND FAULT ALARM PICKUP
and
GROUND FAULT TRIP PICKUP
settings are entered 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 ×
GROUND CT PRIMARY
(see 5.3.1: Current Sensing on page –18)
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
GROUND FAULT TRIP BACKUP
is “On”, 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
. It is intended that this second trip be assigned to
2 Auxiliary or 3 Auxiliary, which would be dedicated as an upstream breaker trip relay. The
GROUND FAULT TRIP BACKUP DELAY
must be set to a 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.
GROUND FAULT
[
]
GROUND FAULT
OVERREACH FILTER: Off
Range: On, Off
MESSAGE
GROUND FAULT
ALARM: Off
Range: Off, Latched, Unlatched
MESSAGE
ASSIGN ALARM RELAYS:
Alarm
Range: Alarm, Alarm & Auxiliary2,
Alarm & Aux2 & Aux3,
Auxiliary2, Aux2 & Aux3,
Auxiliary3, None
MESSAGE
GROUND FAULT ALARM
PICKUP: 0.10 x CT
Range: 0.1 to 1.00 x CT in steps of 0.01
or 0.25 to 25 A in steps of 0.01
MESSAGE
INTENTIONAL GF ALARM
DELAY: 0 ms
Range: 0 to 1000 ms in steps of 1
MESSAGE
GROUND FAULT ALARM
EVENTS: Off
Range: On, Off
MESSAGE
GROUND FAULT
TRIP: Off
Range: Off, Latched, Unlatched
MESSAGE
ASSIGN TRIP RELAYS:
Trip
Range: Trip, Trip & Auxiliary2, Trip &
Aux2 & Aux3, Trip & Auxiliary3,
Auxiliary2, Aux2 & Aux3,
Auxiliary3
MESSAGE
GROUND FAULT TRIP
PICKUP: 0.20 x CT
Range: 0.1 to 1.00 x CT in steps of 0.01
or 0.25 to 25 A in steps of 0.01
MESSAGE
INTENTIONAL GF TRIP
DELAY: 0 ms
Range: 0 to 1000 ms in steps of 1
MESSAGE
GROUND FAULT TRIP
BACKUP: Off
Range: On, Off
MESSAGE
ASSIGN BACKUP
RELAYS: Auxiliary2
Range: Auxiliary2, Aux2 & Aux3,
Auxiliary3
MESSAGE
GROUND FAULT TRIP
BACKUP DELAY: 200 ms
Range: 10 to 2000 ms in steps of 10
Содержание Masoneilan 469 Series
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