Answer / shailesh tankni

the best method of finding the maximum load that can be
connected to transformer is phantom loading test..
in this test separately the current capacity and voltage
capacity are measured without actual loading of transformer..
the advantage of this test is that for large capacity
transformers the actual loading cannot be done as the total
load is very very large so this method is adopted..

Answer / k.prakashchandra

Permiisible max temperature attained on continuous load.The
tr ratings depend on temp rise and they can be overloaded
with additional cooling.

hi pot test principal

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