sepam 20 user manual - Schneider Electric

Commissioning Checking the residual voltage
input connection
PCRED301005EN - 06/2008
DE52247
Description
Check to be carried out for Sepam B21 or B22, when the residual voltage is
measured by 3 VTs on the secondary circuits connected in an open delta
arrangement.
Procedure
1. Connect the single-phase voltage generator to the test terminal box using the plug
provided, in accordance with the diagram below:
2. Turn on the generator.
3. Apply the VT secondary rated phase-to-neutral voltage (Uns/3).
4. Use the SFT2841 software to check the residual voltage value V0.
5. V0 should be equal to the VT primary rated phase-to-neutral voltage (Unp/3 or
Vnp) if the VTs deliver Uns/3 to the secondary circuit.
6. V0 should be equal to the VT primary rated phase-to-phase voltage (Unp or
3Vnp) if the VTs deliver Uns/3 to the secondary circuit.
7. Turn off the generator.
8. Put the cover back on the test terminal box.
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