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Answer Posted / subrat kumar
according to the voltage:-
.step up trf .step down trf
according to the magnetic core:-
.core type trf .shell type trf .berry type trf
according to the winding:-
.single phase trf .three phase trf .polly phase trf
according to the cooling system:-
natural cooled trf .oil cooled trf .watet cooled trf .air blast cooled trf
according to the output:-
auto trf .instrument trf(current trf,potential trf)
according to commercial use:-
.power trf .distribution trf
according to the location:-
.indoor trf .outdoor trf
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