Initial commissioning
59
NGRM7xx_D00292_07_M_XXEN/02.2022
Explanatory notes on trip relay
1. In case of a ground fault, t
GF trip
is only considered when "Ground-fault trip" (menu 6.5) is ena-
bled. When "Ground-fault trip" is disabled, the trip relay does not switch in the event of a ground
fault.
2. In case of an NGR fault, t
GF trip
is ignored, the trip relay switches after time delay t
NGR trip
has
elapsed.
3. The setting for t
GF trip
must under no circumstances be longer than the maximum possible oper-
ating time of the CD-NGRM coupling device.
The table shows an overview of the t(GFtrip) settings for the coupling device use
Tab. 8.1: Maximum trip times t(GFtrip) for the used CD-NGRM
U
sys
Coupling
device
Max. t
trip
Ground-fault trip settings
400…690 V
CD1000
48 h on or off
CD1000-2
691…1000 V
CD1000 300 s on
CD1000-2
48 h on or off
CD5000
1001…4300 V CD5000 48 h on or off
4301…14550 V
CD14400 60 s on
CD25000 90 s on
14551…25000 V CD25000 10 s on
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