Answer / usman

induction motor draws very high current when it is get started
to limit this initial large current we use y configuration
because starting high current will flow through the common terminal to ground making no severe damage.

Answer / rami

yes

i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value

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