Diagnosis of axial displacement in transformer windings using finite element analysis

Abstract

Transformer is one of the main equipment in the power system and power quality of the power system mainly depends on the working of the power transformer. Leakage reactance is one of the main parameters of the transformer. The design of the transformer has a significant impact on the leakage reactance of the transformer. The mechanical strength of the transformer mainly depends on the leakage reactance of the transformer. This paper investigates the leakage reactance of the transformer in normal conditions and during the axial displacement of the high voltage and low voltage windings using finite element analysis. Normal results of finite element analysis method are also compared with the experimental short-circuit test. Results show that leakage reactance of the transformer exponentially proportional to the displacement of the windings. It is observed that with the axial displacement of the $ 6\% $ of the winding, leakage reactance increased by $ 10\% $. Results also show that effect of the axial displacement in high voltage and low voltage winding is almost same.