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1.where in India the maximum transmission voltage is operated?
2.what the methods are used to cool down the
transformer?give the specific ratings of the transformer &
specific cooling process.
3.how zero & negative sequence reactances are formed in a
rotating machine when fault occur in the system?
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Answer Posted / dr. mohd. arif khan
2. the different cooling processes are oil forced(OF), air
natural(AN), OFAN, OFAF, ONAN and ONAF. for higher rating
like 5MVA transformer the cooling is ONAF type.
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