Side 11 of 16
Userguide CableTroll 210 March 2020
01021000/11/12/13
7. Settings/Programming CT 210
Settings for trip level and other parameters are done with the dip-switches on the printed circuit board.
7.1 Setting trip level.
The trip level is normally factory set to 120A.
As the Earth Fault Indicator is of the threshold type, the trip level should be set according to your system
requirements.
Pre-set trip levels:
For user convenience, the fault current trip level can be set to 1 out of 6 fixed nominal values of 40A,
60A, 80A, 120A, 160 and 240A For details, refer to table 1.
Select Trip-Level, dip 1, 2 and 3
1 2 3
Trip-Level
0 0 0 40A fixed trip level
1 0 0 60A fixed trip level
0 1 0 80A fixed trip level
1 1 0 120A fixed trip level
0 0 1 160A fixed trip level
1 0 1 240A fixed trip level
Table 1: Switch setting overview, trip level.
NOTE:
NORTROLLs Earth Fault Indicator and Earth Fault Element are tuned in to constitute a complete Earth
Fault Current Sensing System. If any 3rd party Earth Fault Element is used the system is most likely to
malfunction. The indicator may also be damaged.
The Earth Fault Element detects differences between the earth fault current (eventually compensated
earth fault current) and the charge current through the element (seen from the feeding point).
This differential must exceed the trip level of the Earth Fault Indicator to give an indication.
Please observe that the trip level should be set to a value exceeding the maximum charge current from
the net behind the Earth Fault Element to avoid false indications. To calculate the charge current from
the network, a network analysis must be carried out.
