What test must you do before powering up a circuit that you
have been working on?
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i wanna know that star point in transformer becomes as a neutral on secondary side now tell me that how is that possible?because if joit the all three winding ends with each other it can b short circuited.dut it doesn't.WHY?pls Answer me in brief.thanks alot
why fault current time duration is calculated for 1 minutes?
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