%IMPEDANCE CALCULATION OF TRANSFORMER
%IMPEDANCE CALCULATION OF TRANSFORMER
(OP)
Dear Sir
Please let us know what is the relation between %impedance ,BIL & short circuit current of the transformer
Please let us know what is the relation between %impedance ,BIL & short circuit current of the transformer






RE: %IMPEDANCE CALCULATION OF TRANSFORMER
RE: %IMPEDANCE CALCULATION OF TRANSFORMER
i want to know the relation between impedance and short circuit current.
if possible kindly send me the formula
RE: %IMPEDANCE CALCULATION OF TRANSFORMER
Where:
Tx FLA = the full amps at the base transformer rating, and
Zpu = per unit impedance of the tranformer= 100 x %Z.
Example: short circuit through a transformer with 10%Z will be 10 times its full load amps, assuming it is fed by an infinite source.
RE: %IMPEDANCE CALCULATION OF TRANSFORMER
Bill
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"Why not the best?"
Jimmy Carter
RE: %IMPEDANCE CALCULATION OF TRANSFORMER
If you're talking big transformers at high transmission voltages it can be a reasonable assumption. If you're talking small transformers connected into the distribution system it may not be such a good assumption.
RE: %IMPEDANCE CALCULATION OF TRANSFORMER
"Throughout space there is energy. Is this energy static or kinetic! If static our hopes are in vain; if kinetic — and this we know it is, for certain — then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature". – Nikola Tesla
RE: %IMPEDANCE CALCULATION OF TRANSFORMER
"If you're talking big transformers at high transmission voltages it can be a reasonable assumption. If you're talking small transformers connected into the distribution system it may not be such a good assumption. "
True but many utilities will use this when giving a fault current value to a customer.
RE: %IMPEDANCE CALCULATION OF TRANSFORMER
Thanks for the correction.
Isc = FLA /Zpu = (FLA x 100%)/%Z
RE: %IMPEDANCE CALCULATION OF TRANSFORMER
ithink its good for us