Abstract

The leakage reactance calculations performed here apply to a single phase unit or to one phase of a 3-phase transformer. The phase can have multiple windings interconnected in such a way that only 2 or 3 terminals (external or buried) result. Thus autotransformers, with or without tertiary, are included as well as transformers with separate tap windings. The calculations for windings that are interconnected are based on 2-winding leakage reactances. These reactances can be obtained from a simple analytical formula, which will be presented here, from finite element calculations or from more complicated analytical methods, such as Rabins’ method, which will be presented in a later chapter. We will also be giving the per-unit expressions for these reactances.