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Commissioning
Checking Sepam™ B83
Additional Residual Voltage
Input Connections
Description
Perform this check on Sepam™ B83 units with
additional voltage measurement. This does not check
the main voltage input connections.
Since the additional residual voltage is unrelated to the
currents measured by Sepam™ B83, it is not
necessary to inject current to check Sepam™ B83
additional residual voltage input connection.
Block Diagram
DE51262
* Detection of Plugged Connector (required for proper operation. Installed manually)
Procedure
Use the diagram above to perform the following steps
1 Connect the single-phase voltage generator to the corresponding test terminal
box according to the block diagram above. Use the plugs provided
2 Turn the generator on.
3 Apply the generator voltage V
Ln
set to the rated secondary voltage of the
additional VTs mounted in a broken delta arrangement (depending on the case,
V’
LLp
/ 3 or V’
LLs
/ 3).
4 Use the SFT2841 software to check that the value indicated for the residual
voltage measured V’r is approximately equal to the VTs' rated primary phase-to-
neutral voltage (V’
Ln
p = V’
LLp
/ 3).
5 Turn the generator off when you finish this test.
Van
Vbn
Vcn
Vr
V‘r
V‘cn
V‘bn
V‘an
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