Calculating Generator Fault Current

Calculating generator fault current discussion and example. Conceptual discussion of symmetrical and asymmetrical short circuit current. Symmetrical sub transient fault current calculation example using a typical three phase generator.

[@sohailjanjua123]

Hi Jonathan i like your lecture. Thanks

[@graceyj20]

Glad you found it helpful

[@user-es7ib5gq4s]

Thank you sir

[@g12track]

I could be wrong but wouldn't the FLA formula actually be FLA= (KVA x 1000)/(sqrt(3) x V)

[@graceyj20]

Full load amps do not identify the transient (short time) and sub transient (instantaneous) fault current.

[@hamoodgulf4cars]

How would you calculate the DC component?

[@RJ-xd6tf]

Hi, how would you calculate the tripping current of the circuit breaker if it set to 125%? Thank you in advance.

[@graceyj20]

You have to look at the time to current curves for the specific breaker. You should be able to obtain these from the circuit breaker manufacturer.