METHOD FOR DISCRIMINATING SIGNALS AND INTERFERENCE DURING ULTRAHIGH-FREQUENCY PARTIAL DISCHARGE DETECTION OF ELECTRICAL EQUIPMENT

摘要

A method for discriminating signals and interference during ultrahigh-frequency partial discharge detection of electrical equipment comprises the following steps of: a. carrying out ultrahigh-frequency signal acquisition near equipment to be detected using four sensors to obtain four paths of ultrahigh-frequency partial discharge signals; b. carrying out time-delay calculation using an adaptive time-delay calculation method based on the least mean square algorithm according to the acquired four paths of ultrahigh-frequency signals to obtain three time-delay values; c. substituting the three time-delay values obtained by calculation into a positioning equation system, and solving the equation system using a simulated annealing algorithm to calculate the position of a discharge source; and d. according to the positioning result of the discharge source, judging whether the detected signals come from the inside or the outside of the equipment, so as to discriminate the partial discharge signals and the interference signals. The present invention can achieve and improve the discrimination of discharge signals and interference signals during partial discharge detection of electrical equipment, and particularly can achieve discrimination of interference to the equipment to be detected by discharge signals of external equipment.