These videos will show you how to perform manual pickup tests using various test-sets and software.
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Click Here if You Use a Manta Test-Set
These tests were covered in these previous topics:
Click Here if You Use an Omicron Test-Set
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Hi Chris, when you perform the test for phase to ground with the Omicron quick test as the video above. We can see the IE is in opposite phase with Iphase. This is true for both 1. The common neutral connection of all 3 line CTs as well as 2. The residual CT. In the case you showed, is IE the common neutral current of all 3 line CTs or a forth residual CT current? What’s your hardware configuration for this case?
I can look at it if you give me a time stamp, but I think my previous answer explains the 180 degrees (https://valence.relaytraining.com/topic/topic-s1-7-07-choose-appropriate-fault-type-test-three-phase-faults/).
All modern relays will calculate I0 internally, so three phase currents are all you need.
An external residual neutral CT is just 3 x I0, so you can connect it with a residual current with three phase inputs if you never want to do any math.
You can do the same with a neutral CT with the same CT ratio as the phase CTs.
Or you could change your hardware configuration to output 4 current outputs and constantly make sure you are producing the correct current and phase angle for the forth “ground” current.
Guess which one I prefer?
The crash course on Omicron is helpful. I’ve only used Omicron a couple times. My employer mainly uses Megger and Doble, so I’ll throw my two cents in with the folks at Doble and Megger.
Megger has already agreed to send me a test-set when I am ready, so those videos will be added later this year.
Doble, on the other hand, has not been receptive; so any help in that regard would be helpful.