Answer Posted / ram

SOTF:When the line is being charged the earth isolaters are being opened so that the charging current wont get leaked r loss and the breakers will also be in open position when we close we may not be knowing whether the fault will occur from other Bus side or any other side so once we close the breaker the SOTF function will get enabled and it protects for 500ms once the fault occurs it trips the master trip relay and the master relay trips the breaker

Normally while charging the approximate current flow will be 0.2A

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