Online diagnosis system and method for high-voltage electrical equipment

The invention particularly relates to an online diagnosis system and method for high-voltage electrical equipment. The online diagnosis system comprises a signal acquisition system, a signal processing system and a signal evaluation system, wherein the signal acquisition system is used for acquiring partial discharge signals of the high-voltage electrical equipment in real time and forming a signal packet file; the signal processing system is used for identifying, reading and processing a fault characteristic signal file in the signal packet file to form a data file; and the signal evaluation system is used for further analyzing and calculating the data file to obtain a partial discharge parameter of the high-voltage electrical equipment, comparing the partial discharge parameter of the high-voltage electrical equipment with a historical partial discharge parameter of the high-voltage electrical equipment, judging the health state of the insulation performance of the high-voltage electrical equipment, and obt