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Answer Posted / arun
In transformer 2 types of losses
1.constant losses(core losses and eddy current losses)
this loses estimated by conducting open circuit test
in oc test we apply rated voltage .so we obtain total constant loses
2. variable losses (cu loses)
this loses estimated by conducting short circuit test.
in sc test we pass rated current through windings of transformer .so we get the rated copper losses.
cu losses vary with load but by conducting sc test we obtain max cu loss
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