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RC protection for surges

RC protection for surges

RC protection for surges

(OP)
Hello!
I'm looking for hints on how to design the RC protection for large motors started and protected with vacuum breakers. I have read that together with surge supressors there is a need for RC group surge protection to limit the steepness of voltage rise.
I know that usually you have to make a EMTP programme simulation but it is very complicated and time consuming (not to mention you have to be an expert). Maybe somebody has already found an article/ recommendation for the design method for such a RC group.
Thanks!
Pafi

RE: RC protection for surges

I'd suggest a web search for motor (or generator) surge suppression.  Normally the surge capacitor is integral with the surge (lightning) arrester and furnished as a single unit.

http://www.abb.com/product/db0003db002618/c12573e7003302adc1257053004b6e49.aspx

Bus if the motor is fed from a VFD or a soft starter, search this forum for a recent discussion of the problems with using capacitors.

David Castor
www.cvoes.com

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