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Short circuit - DC Component 1

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NickParker

Electrical
Joined
Sep 1, 2017
Messages
455
Location
NL
The ETAP short circuit report shows, all the parameters are okay, except the DC component part.

All_parameters_okay__X_DC_component_hylfaz.png


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!
 
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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