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CLF and Arc Flash Studies

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Amex12

Amex12

Electrical
Joined
Sep 29, 2020
Messages
18
Location
CA
What are your approaches to modelling transformer primary CLF fuses in arc flash studies? Currently, we do not consider them and I am not sure how to accurately model their affects in ETAP.

Thanks!
 
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They probably don't matter. I would not expect a primary CLF to see enough current for a secondary fault to operate in the current limiting range.

I’ll see your silver lining and raise you two black clouds. - Protection Operations
 
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You would just model their time-current curves like any other overcurrent device. Unless they are clearing within the first 1/2 cycle, they aren't considered current-limiting.
 
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