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Start by
Simon Marley
10-18-2013 03:35 AM

How to properly test directional relays?

Having some issues with directional relays. Some have been fitted in the correct orientation and some not. They have had secondary injection tests on the relay itself but I'm looking for a way to test the whole thing, end to end. The only way I can think of is to use our secondary injection test set to inject volts and amps on the busbars (primary) and see if I can push enough through the VT and CT to arm the relay.

Any other suggestions?

Many thanks, Simon
10-18-2013 06:18 AM
Top #2
Alan Maltz
10-18-2013 06:18 AM
It's not the relays that are "fitted" in the wrong orientation, it's the Instrumentation Transformers and all of their associated wiring back to the relays that needs to be oriented correctly. One crossed wire/polarity mark and nothing will operate correctly.
10-18-2013 08:45 AM
Top #3
Simon Marley
10-18-2013 08:45 AM
Alan, thanks for the prompt response. The question is how do we test the orientation of the transformers and wiring?
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