Answer Posted / bala

we need to know the Impedance of the TxR.Becos the Formula for Determine the KA value is
=power/ (1.732*400*% of Impedence)
For EX-
Power = 1500 KVA
Voltage = 400V
Impedance = 6%
short circuit = 1500*1000/(1.732*400*0.06)
= 36085A or 36 KA

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