Calculating the leakage inductance for transformer inter-turn fault detection using finite element method

Abstract

The inter-turn fault is a common internal fault in the windings of transformers. This fault can cause the increase of transformer leakage flux. In this paper, the leakage inductance caused by the inter turn-fault is calculated by modeling of a single-phase transformer using finite element method. Finite element model of the transformer is simulated considering Non-linear magnetic characteristic of the core using ANSYS Electromagnetics Suite 17.2 software. in order to calculate the leakage inductance, two and three-dimensional modelings are used in the magnetostatic states. Data obtained from the finite element method were compared with data obtained from analytical method. The results show the high accuracy of finite element method in short-circuit inter-turn fault detection in the transformer.