High-voltage circuit breaker external insulation state judgment method based on fundamental wave electric field proportion

According to the high-voltage circuit breaker external insulation state judgment method based on the fundamental wave electric field proportion, electric field intensity measurement sensors and gas sensitive sensors are arranged on A-phase, B-phase and C-phase stand columns of a high-voltage circuit breaker respectively; the method comprises the following steps of: firstly, setting acquisition frequencies of an electric field intensity measurement sensor and a gas sensitive sensor, collecting acquired data to form a set, then setting a time period for judging an external insulation state, and calculating a three-phase fundamental wave electric field proportion of the high-voltage circuit breaker in the time period; and finally, the external insulation state of the high-voltage circuit breaker is judged according to the proportion of the three-phase fundamental wave electric field. According to the method, the external insulation state of the high-voltage circuit breaker is judged according to the special fund