Perform Inverse Timing Tests

Topic

Perform Inverse Timing Tests

These videos will show you how to create and/or modify timing tests that you can apply to any element with an inverse time.

Omicron Test Universe

Manta MTS-5000/5100

Doble F6150 Test-Sets or Enoserv RTS Software

We can’t use their products without express permission from them, even if we rented or purchased them.  We’ve been trying to get that permission for years but no-one seems to know who we should talk to, or they don’t return our messages. At this point, the only hope is for you to contact your local Doble rep and ask them to contact us to participate.

Megger Test-Sets

We contacted Megger to see if they wanted to participate and they said that they need approval from the higher-ups before they could send a test-set. Please contact your Megger rep and ask them to contact Greg Valdez (Megger’s Marketing Communications Manager) to see if we can add them to this series.

Other Test-Sets

Don’t see your test-set in this series? Leave a comment below and we’ll see if we can get a demonstration unit and add a video for that test-set.

Click “Mark Complete” below after watching the video so you can keep track of your progress.

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Would it be possible to get copies of the plans you used in these training videos for the Omicron? I would like to go through them and see how you made them which is a bit hard to do from watching the videos

Chris Werstiuk (Administrator) October 23, 2016 at 12:03 pm

It doesn’t look like I saved this specific test plan, but you should be able to see something similar in the “51GT 2X” test in this file.

Download the file

Hope it helps.

To check my understanding of why the elements tripped to soon in the Omicron video at 8:00, what I think happened that caused B and C to operate too quickly is that the relay has an “energy bucket,” if you will, that fills up as the A phase fault is introduced and then gradually emptied back out. By lengthening the time between the tests, this allows the relay’s energy bucket to empty out, and the times for phases B and C align with the expected value. Is this accurate?

Chris Werstiuk (Administrator) July 8, 2022 at 5:07 pm

Your analogy could be used to describe what’s happening, but you are really describing a overload element and I would try to keep the two separate in my head because the “energy bucket” for an inverse element with electro-mechanical reset turned on will empty much faster than an overload’s “energy bucket” would.

The electro-mechanical reset setting is on inside the relay, so the digital relay is pretending that there is a disc inside the relay that must move back to the reset position after the current falls below the pickup setting, like you see in this video (https://vimeo.com/728290394) of a 2x timing test. The relay operated in 6 seconds, but the relay disc isn’t fully reset until 16 seconds after the trip. If you try to start a new timing test in less than 16 seconds after the trip, the virtual disc inside the relay will be closer to the trip position and trip faster than expected.

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