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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HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.
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