Voltage transformer on-line state monitoring and fault diagnosing method

The invention discloses a voltage transformer on-line state monitoring and fault diagnosing method and relates to a voltage transformer state monitoring and fault diagnosing method. The method comprises the following steps: voltage transformer winding parameters are calculated via a microprocessor based on first to fourth high frequency discrete signals which are collected synchronously and a voltage transformer winding parameter calculating formula, the calculated voltage transformer winding parameters are output to a storage device, the detection result of all parameters is displayed on different display devices, and a voltage transformer state can be determined by workers and fault diagnosis can be realized according to obtained numeric values of the voltage transformer winding parameters and a fitting curve thereof. According to the voltage transformer on-line state monitoring and fault diagnosing method, actually measured electrical parameters are used for calculating resistance and reactance parameters