Perform an Acceptance Test

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Perform an Acceptance Test

You want to make sure that all of the physical components inside the relay are functional before you get in too deep. A properly performed acceptance test will make sure that the manufacturer sent you a fully functioning relay.
 

 
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Chris,
I may have misunderstood but in the above video there’s mention of checking self check or alarm contact by using Fluke to check continuity ringing when powered down & then when powered up ringing should go away. Is the video suggesting to use continuity function when relay is powered on to see if contact opened? Only ask b/c I’ve always understood to not check for continuity on energized circuit. Thank you in advance

Chris Werstiuk (Administrator) June 4, 2021 at 8:45 am

I agree that a better procedure would be to find out where that contact alarm is connected to in SCADA and make sure that the SCADA alarm actually appears when the relay is de-energized, but that’s usually impractical; so a continuity check is the second best solution.

I also agree that it’s not a good idea to check continuity on an energized circuit (especially an energized trip circuit!), but it is a better solution that lifting wires or de-energizing circuits for a test.

Thanks for the excellent question!

Hi Chris, for the purpose of confirming phase rotation and would you agreed that by simulating/injecting a balanced 3 phase signal to check on pure +ve seq signal (as you proposed) followed by an unbalance signal (phase and magnitude) and check on the phasor diagram/phase value displayed by the relay would also confirm it?

Chris Werstiuk (Administrator) July 25, 2021 at 8:35 am

That method would work also. I probably said in the video that I like to keep things simple and a foolproof as possible, which is why I suggest applying one phase at a time. It’s pretty obvious that if you apply B-Phase voltage or current and you see a C-Phase measurement in the relay. When you apply unbalanced three-phase signals, it’s easier to get fooled into thinking its correct because of unfamiliar color combinations or crappy labelling.

Thanks for the question!

Ha ha ha, makes sense.

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