Transformer impedance
Transformer impedance
(OP)
Is there any difference between the usual Transformer impedence(primary/secondary or refferd value to either side)and the percentage impedence usually quoted on Transformer name plates (usually in percent)? Can they be used interchangebly?






RE: Transformer impedance
RE: Transformer impedance
RE: Transformer impedance
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RE: Transformer impedance
With the same transformer ratios there should be no circulating current between parallel transformers. At normal loading levels different impedances will result in disproportionate load sharing.
The actual load sharing is more dependant on the regulation of the transformers than the impedance. The power factor of the load also has an effect. With a high power factor the resistive component of the impedance predominates. Under short circuit conditions the impedance of the transformer determines the power factor and current is dependant on the impedance.
If you parallel transformers of different ratios there will be circulating currents that will be limited by the transformer impedances.
You should also check the X/R ratio of the transformers. If the X/R ratio of the transformers is significantly different you should break the impedance of each transformer into its
resistive and inductive components and add them vectorily to determine the impedance of the parallel combination.
respectfully
RE: Transformer impedance