Technical Guide
Testing self-powered relays with SVERKER 900
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Figure 34. First step of the sequence.
Injection of 1 A in phase L1 for 190 ms.
Figure 35. Second step of the sequence. No
injection (injection of 0 A in phase L1) for 40
ms.
Figure 36. Third step of the sequence.
Injection of 1 A in phase L1 for 30 seconds;
period long enough to let WIP-1 relay
perform the self-test procedure and press
the button on its HMI as requested at the
end of the test.
At
the end you need to press the “SELECT” button on relay HMI to acknowledge that the test is terminated (just
follow the instructions that the relay proposes through its screen).
A simple video clip [14] shows the self-testing procedure in WIP-1 relay activated when this sequence is run. In
the video clip, the injection is done without current generators in parallel, but it is anyhow suggested to perform
this with the parallel connection in SVERKER 900.
6.4. Testing the protection function without pre-fault (switch onto fault).
As mentioned in 3.2, there is a difference in the relay performance when the power system fault occurs after a
situation with a certain pre-fault (load) level, or without it. As also mentioned, this condition can be connected to
