Short-Circuit Strength Analysis of Distribution Transformer with OblongWinding by FEM

Abstract

Aiming at the problem of insufficient short-circuit strength of distribution transformer with oblong winding, the three-phase symmetrical short circuit simulation of a 630KVA oblong distribution transformer is carried out by using finite element software. The time series calculation of the short circuit impedance of the transformer and the strength check analysis of each part of the oblong winding are carried out. The short circuit force distribution law of the foil winding of the oblong transformer is obtained, which provides a good reference method for the short circuit check of the distribution transformer.