Answer Posted / deepakindi1

same as u do in for any 3 phase circuits

ie KW=sqrt(3)*V*I*cos(@)

WKT cos(@)=KW/KVA

SO KW/cos(@)=KVA

KVA=sqrt(3)*V*I

I=KVA/sqrt(3)*V

FOR EXAMPLE CONSIDER 11KV/440V 100KVA TRANSFORMER
AT PRIMARY
I=100/sqrt(3)*11
I=100/(1.732*11)
I=5.24A

AT SECONDARY I=100/sqrt(3)*.44
I=100/(1.732*.44)
I=131.24A

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