The winding has at least three leakage reactance, lower losses, lower excitation current, and increased VA rating for a given size and mass.
2.
The leakage reactance ( usually about 5 to 10 % of the full load impedance ) helps limit both the magnitude and rate of rise of the fault current.
3.
Since both the primary and secondary windings are made of copper, the windings contribute to the ohmic losses and leakage flux which is represented by resistance and leakage reactance in the primary and secondary circuit.
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