Research on Radial Stability and Its Influence Factors of Transformer Windings under Short Circuit Fault

The safe operation of power transformers is of great significance to the stability of the power system. Radial stability of windings is an important issue for transformer design and maintenance. This paper presents an effective method to analyze the radial stability of windings. The electromagnetic characteristics of a 110 kV two-winding power transformer is calculated and analyzed by finite element method. The mathematical model of radial stability of the power transformer windings under short circuit condition is established. The radial stability analysis of the low winding is performed. The relationship between critical buckling load and its influence factors, including winding material characteristics and winding structure parameters, are obtained based on the buckling analysis. The research results can provide reference for the transformer design, manufacture, operation and maintenance.