Application of Frequency Response Analysis Technique to Detect Transformer Tap Changer Faults

Power transformers are located in the electrical transmission and distribution networks where different voltage levels needed. The turn ratio of low high windings is mechanically controlled by an on-load tap changer or de-energized changer. As transformer’s only moving part, it highly susceptible to mechanical failure aging degradation. While some diagnostic tools have been used determine condition contacts, not much attention was given use frequency response analysis diagnose changers’ integrity. This paper taking one step forward into maturing application (FRA) technique detect transformer faults. In this regard, two common faults created, experimental testing for four FRA test configurations conducted. For a better understanding fault mechanism, equivalent circuit model proposed designed using Simulink. simulation implementation circuits MATLAB\R2018a.