Method and system for measuring partial discharge quantity of power cable

The invention discloses a method and a system for measuring the partial discharge quantity of a power cable. The method comprises the following steps: performing spectral analysis on partial discharge signals to obtain partial discharge signal spectral characteristics of different cable positions; performing low-pass filtering on the partial discharge signal spectrum characteristics to obtain a low-frequency component; and according to the peak value of the low-frequency component and the calibration proportionality coefficient, obtaining local discharge amounts of different cable positions. According to the characteristics of fast attenuation of high-frequency components and slow attenuation of low-frequency components in the partial discharge signals, spectral analysis is carried out on the partial discharge signals at different positions, meanwhile, a digital filter is designed to filter out the fast attenuation high-frequency components in the partial discharge signals, the partial discharge quantity is c