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where is used dc volage transformer,and what is highest
capacity of transformer
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Answer Posted / dinesh lokhande
If question is where is DC voltage used in transformer then
it is correct, used for measuring resistance.
To elaborate,
DC voltage is used to counter effect inductive reactance
of winding. As winding put on core coil assembly consist of
resistance as well inductance, for measuring pure reistance
we pass DC current through winding.
Impedance = resistance + Inductive reactance.
Inductive reactance = 2*pi*f*L where,
L = Inductance
f = frequency which is zero for DC and hence Inductive
reactance becomes zero for DC supply.
measured impedance at winding terminal is pure resistance.
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