Answer / bala.a

Hai
we are using two method for find fault level.
1 - based on the supply voltage level
2. Based on the T/F capacity , Impedance, cable and
distance .

The first methios iS very simple but you will follow as
per TNEB standard. TNEB standard

11 KV - 350 mva
22 KV - 500 mva
33 KV -750 MVA

SO based on the aove standard

for 11 KV = 350 / RT 3 * 11 =18.39 KA

i.e = 11= Applied voltage or system voltage

Answer / prateek

fault current is equal to 20 times the load I
generally
fault I=20 * 1.4

1.4 = load I

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