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Transformer Engineering, 2nd Edition by S.A. Khaparde, S.V. Kulkarni

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3

Impedance Characteristics

The leakage impedance of a transformer is one of the most important specifications that has significant impact on its overall design. It consists of resistive and reactive components, and it has been introduced and explained in Chapter 1. This chapter focuses on the reactive component (leakage reactance), whereas Chapters 4 and 5 deal with the resistive component. The load loss (and hence the effective AC resistance) and the leakage impedance are derived from the results of the short-circuit test. The leakage reactance is then calculated from the impedance and the resistance (Section 1.5). Since the resistance is much lower than the reactance in transformers, the latter is almost equal to the leakage impedance.

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