Fault detection method and system for power distribution network box type equipment

The invention discloses a fault detection method and system for power distribution network box type equipment, and the method comprises the following steps: obtaining the data of the power distribution network box type equipment in a normal state and a fault state, building a DKPCA (Dynamic Kernel Principal Component Analysis) model according to the data, and calculating the statistical limit of the data; acquiring real-time data of the power distribution network box type equipment on line, performing data normalization on the real-time data, inputting the real-time data into the DKPCA model, and calculating the statistical magnitude of the real-time data; and judging whether the statistical magnitude of the real-time data exceeds the statistical limit, and determining that the power distribution network box type equipment is in a fault state when the statistical magnitude of the real-time data exceeds the statistical limit. According to the method, the correlation among multiple variables causing the power d