Black Box IC109A-R2 Manual de instalación Pagina 137

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13163230-216-229-B1
3
© 2007 Schneider Electric. All Rights Reserved.
Commissioning
Checking Residual Voltage
Input Connections
With Voltage Delivered by
1 Neutral Point VT
Description
Perform this check when the Sepam™ residual voltage
input is connected to one VT installed on the neutral
point of a motor or generator (in which case the VT is a
power transformer).
Block Diagram
DE50713
Note: the number of CTs/VTs connected to the Sepam™ current/voltage connector phase inputs is given as an example and is not used for the test.
* Detection of Plugged Connector (required for proper operation. Installed manually)
Procedure
Use the diagram above to perform the following steps
1 Connect the generator voltage terminals to the voltage test terminal box, so as to
only supply Sepam’s residual voltage input.
2 Turn the generator on.
3 Apply a VN voltage set to the rated secondary voltage of the neutral point VT (that
is, V’
Ln
ts).
4 Use the SFT2841 software to check that the measured neutral point voltage V
Nt
is approximately equal to the rated primary phase-to-neutral voltage of the VTs
(V
Ln
ts).
5 Turn the generator off when the test is completed.
Van
Vbn
Vcn
Vr
Van
Vbn Vcn
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