Answer / dhiraj shringi

the power upto the fault in power system is known as fault
level power.

it is calculated by the following formula:

fault MVA= BASE MVA/PU IMPEDANCE upto fault level.

Answer / mahesh sali

As per IEC std. Low voltage fault have decide as below
mentioned ranges.
For 50 KA / 65 KA at 1 or 3 sec.
for cal Fault current KA - ( KVAsc/ %sub transient
reactance ) *100

thanks

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