Answer / Jolly

The percentage impedance (Z%) of a transformer is a ratio that determines the load capacity and efficiency of the transformer. It can be calculated as Z% = (Impedance / KVA rating) * 100%. At the design stage, the percentage impedance is typically selected based on factors such as cost, size, efficiency requirements, and load characteristics. A lower percentage impedance means a more efficient but larger transformer, while a higher percentage impedance results in a smaller yet less efficient transformer.

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