Effect of pulse propagation characteristics in power transformer on partial discharge recognition
An experimental method is utilized to investigate the propagation characteristic of discharge pulse and its influence on the recognition of partial discharge in this paper. Firstly, the discharge model tests of common defect in oil-paper insulation are finished. A series of tests are conducted to study the propagation characteristic of discharge pulse along the winding. Thus the identification of discharge waveform could be implemented. The restoring method of the original wave and the extracting method of wave characteristic are also put forward. Finally the backpropagation (BP) neural network is utilized to recognize the wave characteristic of discharge signal. The validity of recognition system is illustrated.