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Testing Protection relay


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Hi Marke,

I am thinking of testing my protection relay for over and under frequency using a small variable frequency drive. My intention is to set the VFD to scalar control and wire a 400/110 V transformer to the output of the VFD. How would the VFD behave?

Best Regards.


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Hi Bob

That would be very dependent on the actual VFD that you were using. The smarter the internal waveform generation algorithms, the more it would object. You may need to get something out of the ark to make it work. The only thing that I can suggest is to try it and see.

You may have more success if you use a true sinusoidal filter on the output before the transformer connection, but it is not really about the theory, it is about the implementation that has been achieved in the particular drive.

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  • 3 weeks later...

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