sepam 20 user manual - Schneider Electric

Commissioning Checking phase current input
connections
1 A/5 A current transformers
PCRED301005EN - 06/2008
DE80135
Description
Check to be carried out for Sepam S20, S23, T20, T23 or M20, when phase currents
are measured by 1 A or 5 A current transformers.
Procedure
1. To inject a current into the phase 1 input, connect the single-phase generator to
the test terminal box using the plug provided, in accordance with the diagram below:
L1
L2
L3
A
I
N
ex : I1
A
2. Turn on the generator.
3. Inject the CT secondary rated current, i.e. 1 A or 5 A.
4. Use the SFT2841 software to check that the phase 1 current value is
approximately equal to the CT primary rated current.
5. If the residual current is calculated by taking the sum of the 3 phase currents, use
the SFT2841 software to check that the residual current value is approximately equal
to the CT primary rated current.
6. If the residual current is measured via 3 phase CTs, use the SFT2841 software to
check that the residual current value is approximately equal to the CT primary rated
current.
7. Turn off the generator.
8. Proceed in the same way for the other 2 phase current inputs.
9. At the end of the test, put the cover back on the test terminal box.
4
1
5
2
6
3
18
19
B
A
Sepam
S20/S23/T20/T23/M20
7/25
7