Black Box IC109A-R2 Installationshandbuch Seite 143

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13763230-216-229-B1
3
© 2007 Schneider Electric. All Rights Reserved.
Commissioning
Checking Sepam™ C86
Unbalance Current
Input Connections
Description
Perform this test on Sepam™ C86 units with
measurement of capacitor unbalance currents. This
does not check the phase current input connections.
Since the capacitor unbalance currents are not related
to the voltages measured by Sepam™ C86, it is not
necessary to inject voltage to check the Sepam™ C86
capacitor unbalance current input connections.
Procedure
Use the diagram below to perform the following steps
1 Connect the single-phase current generator to the corresponding test terminal
box, using the plugs provided, according to the block diagram below.
2 Turn the generator on.
3 Inject the generator current I set to the CTs’ rated secondary current (1A, 2A or
5A) to Sepam’s step 1 unbalance input (via the test box).
4 Use the SFT2841 software to check that the unbalance current value indicated
I’a is approximately equal to the CTs' rated primary current.
5 Proceed in the same way by circular permutation with the unbalance currents of
steps 2, 3, and 4, to check the I’b, I’c and I’r values.
6 Turn the generator off when you finish this test.
Block Diagram
DE51263
* Detection of Plugged Connector (required for proper operation. Installed manually)
Check Appendix A, GFC Measuring Table for more information.
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