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Commissioning
Checking Sepam™ B83
Additional Phase Voltage
Input Connections
Description
Perform this check on Sepam™ B83 units with additional phase voltage measurement. This does not check the main voltage input connections.
Since the additional voltages measured are unrelated to the currents measured by Sepam™ B83, it is not necessary to inject current to check
the Sepam™ B83 additional phase voltage input connections.
Block Diagram with Three Additional VTs
DE51260
* Detection of Plugged Connector (required for proper operation. Installed manually)
Procedure
Connect the voltage generator to the corresponding
test terminal box, using the plugs provided, according
to the diagram for the number of VTs connected to
Sepam™.
Perform the test in the next column as determined by
the generator you are using.
Procedure
Use the diagram above to perform the following tests.
Checking with a Three-Phase Voltage Generator
1 Turn the generator on.
2 Apply the three generator voltages Van, Vbn, Vcn, balanced and set to the rated
secondary phase-to-neutral voltage of the additional VTs (V’
Ln
s = V’
LL
s / 3).
3 Use the SFT2841 software to check that the values indicated for each of the phase-
to-neutral voltages V’an, V’bn, V’cn, and the positive sequence voltage V’1 are
approximately equal to the VT's rated primary phase-to-neutral voltage
(V’
Ln
p = V’
LL
p / 3)
4 Turn the generator off when you finish the test.
Checking with a Single-Phase Voltage Generator
1 Turn the generator on.
2 Apply the generator voltage V
N set to the rated secondary phase-to-neutral
voltage of the additional VTs (V’
Ln
s = V’
LL
s / 3) across the Sepam™ phase A
voltage input terminals.
3 Use the SFT2841 software to check that the value indicated for the phase-to-
neutral voltage V’an is approximately equal to the VT's rated primary phase-to-
neutral voltage (V’
Ln
p = V’
LL
p / 3).
4 Proceed in the same way by circular permutation with phase b and phase c
voltages, to check the V’bn and V’cn values.
5 Turn the generator off when you finish the test.
V‘an
V‘bn
V‘cn
V‘r
Vr
Vcn
Vbn
Van
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