Answer / shubham gupta

it depends upon the grounding method employed.
LG fault current is more if the generator is solidly grounded.

Answer / dr rajan

It is always the 3 phase bolted fault. Check your problem
again. You may have made a mistake. Why 3Ph fault current is
high?

When all phases are grounded or shorted, the impedance is just
let us say X in each phase leading to V/X x 3 times. where as
when you have LG, you will include the line impedance in
series with X, equals X+xL, which is more than X on 3Ph short
ckt. When you divide V/(X+xL) what will you have???? More
current or less current???????

pls tell me about ups internal connection & we have given only 3 phase supply to ups system how get 4 wire (R Y B N )

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