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Research of transformer online monitoring technique for transformer winding deformation is of great significance. In this paper, a method to diagnosis transformer winding online is concerned. This method uses transformer's operation voltage and current to build an ellipse that is called Lissajous figure. Through Lissajous figure, winding deformation is able to be reflected sensitively and intuitively...
Frequency response analysis (FRA) is a regular method to detect winding faults in transformer. According to the kind of excitation source, it can be divided into two categories that are impulse frequency response analysis (IFRA) and sweep frequency response analysis (SFRA). Compared with SFRA, IFRA use less time during test and can reach higher frequency domain it's about 10MHz, with SFRA usually...
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