how to carry out Magnetizing Current Test on Distribution transformer and wha

how to carry out Magnetizing Current Test on Distribution
transformer and what purpose we are doing this test.
why transformer rating in always in KVA ?
what ispositive, negative, zero sequence impedence?
How ElCB tripping if Neutral touch with ground
Why AC & DC capacitor are use in UPS ?
why motor rating in KW?
how to syncronize two dg sets

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