Determination of Technical Condition of the Power Transformer by Frequency Response Analysis Method

In 10 kV electrical distribution networks, many power transformers have been in operation for more than 25 years, which exceeds their passport life and in conditions of rapid growth of power generated by photovoltaic stations can cause a decrease in the reliability of these networks. Therefore, it is necessary to improve the quality of modern means of determining the technical condition of such transformers. It is proposed to determine the defective node of the transformer by comparing the current frequency response of the studied transformer with the sample, which is obtained by averaging the values of the frequency characteristics of other transformers, the same type with the test.