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Short circuit - DC Component

thread238-483508

Short circuit - DC Component

Short circuit - DC Component

(OP)
The ETAP short circuit report shows, all the parameters are okay, except the DC component part.



I think since the calculated "Ib asym" includes the decaying dc component, therefore I need not change the breaker ratings or increase the time constants.

Your thoughts are appreciated!

RE: Short circuit - DC Component

Idc is important and to be seen separately. If you have large Idc component, it suggests the breaker is close to a generator.
The estimated Idc seems pretty high. If you have verified and confident of the result, you can ask vendor for a solution. SF6 breakers have better Idc capability than VCBs. You may also have to consider buying a higher rated (SC) breaker.

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