9.10 RELAY METERING 9.10.1 CURRENT METERING
PHASE CURRENT
Set the relay to 50Hz and apply the following currents:
Check that the relay measures Ia, Ib and Ic with an accuracy better than 3%.
Set the relay at 60Hz and repeat the test.
GROUND CURRENT
Set the relay to 50Hz and apply the following current:
Check that the relay measures the current with accuracy better than 3%.
Set the relay at 60Hz and repeat the test.
PHASE 1 2 3 4
Ia (Amps) 0.5 x In (phase)
Ib (Amps) 0.1 x In (phase) 1 x In (phase)
Ic (Amps) 2 x In (phase)
1 2
In (Amps) 0.1 x In (ground) 4 x In (ground)