Method and system for evaluating insulation deterioration of alternating current power supply system for station

The invention relates to the technical field of power equipment evaluation, in particular to a method and system for evaluating insulation degradation of a station alternating current power supply system, and the method comprises the steps: firstly obtaining a sudden change waveform of the residual current of the alternating current power supply system; performing signal processing on the abrupt change waveform, and determining a plurality of signal characteristic values representing amplitude-frequency characteristics; according to the plurality of signal characteristic values, determining a plurality of abnormal characteristic values representing anomalies in the abrupt change waveform; and finally inputting the plurality of influence factor data and the plurality of abnormal characteristic values into an evaluation model to obtain an evaluation result of insulation degradation. According to the embodiment of the invention, the amplitude values of different frequencies in the abrupt change waveform are extr