Identifying and Locating Connection Fault of Layer Winding Turn in Distribution Transformer

Transformers are considered as the most important and expensive distribution and transfer networks of electrical energy. Among different fault identifying in transformers, identifying winding fault is not easily recognizable because of lower domain effect in terminal voltages and currents. In this article, frequency response analysis method is used as an efficient method to recognize turn’s connection fault. By comparing frequency response in fault and intact conditions, fault recognizing in winding becomes possible. In order to determine frequency response, the described winding model is used. Analyzing the model is done by MATLAB software. The accuracy of this model is very dependent on determining its parameters. In order to exact calculation of parameters of described winding model, Finite Element Method based on winding design information is used and in order to increase accuracy, parameter dependency to frequency is considered. Finally, the effect of turn’s connection fault and its location on layer winding of a distribution transformer is evaluated.