Traditional pickup testing is almost redundant in modern digital relays. Timing tests, however, are one of the most important tests and we show you how to perform them here.
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Introduction to Relay Testing
16 Topics
Isolate the Relay from the System
2 Topics
Connect the Test-Set to the Relay
3 Topics
Upload the Relay Settings
2 Topics
Perform an Acceptance Test
5 Topics
How to Test Protective Elements
17 Topics
Perform a Commissioning Test
9 Topics
Perform Maintenance Tests
5 Topics
Post Testing Tasks
4 Topics
Hello Chris,
I was wondering why you did not change any of your Tests Set configuration playing between Phase Faults Vs ground Fault, is your Ground CT Derived? or a independent CT?
Regards,
Ahmed
The ground is a residual ground calculated by the relay. Once you connect your three-phase voltages and currents, you can control the kind of fault by simulating the kind of fault you want to test. Future topics in the course will show you the difference between a proper P-N, P-P, and 3P fault.
Hi Chris, what would your next move be when you discover that the settings do not meet the intended operation of the relay in question? Over here in our part of the world, there is no formal feed back channel to the owner of the plant or the design engineer. The culture of relay testing here is only to test the relay and to report the result against the setting.
I’m not sure how to answer this because I always had direct access to the design engineer and the site personnel. As I’ll mention later on when we go into detail, if the problem is a major issue, I would stop the test and report it to the design engineer if I had access, the site representative if I had access, or my supervisor to forward it along.
Because I expressed what would happen if the problem wasn’t fixed, that usually triggered a setting revision if the problem was obvious, or a meeting to discuss the problem. The meeting usually started with some pushback from the engineer, but I would explain the issue as I saw it and explain that they were the design engineer’s settings to do with as they wish, so they had to make the decision.
If I was wrong, I would say thanks for the education and drop it.
If they didn’t to fix it, I would remind them that my test sheets would document the problem and that I brought it up with them, so no liability would fall my way.
I don’t recall any major problem where I was correct that wasn’t corrected.
Minor problems were usually cataloged into a daily report that was sent to the design engineer to review and resolve as they wished. All problems were summarized and organized by “Deficiencies That Require Immediate Attention”, “Deficiencies That Require Attention” and “Deficiencies Resolved”