Acoustic-electric combined detection system and positioning method for GIS (Gas Insulated Switchgear) local discharge

The invention discloses an acoustic-electric combined detection system and a positioning method for GIS (Gas Insulated Switchgear) local discharge. According to the acoustic-electric combined detection system, a high-speed acquisition system and a low-speed acquisition system are integrated into a whole; and a local discharge pulse signal is used as a trigger source for synchronously triggering high-speed acquisition and low-speed acquisition of the signal so as to realize synchronous acoustic-electric combined detection of an ultrahigh frequency signal, a high-frequency current signal and an ultrasonic signal for GIS local discharge. According to the acoustic-electric combined detection system and the positioning method disclosed by the invention, by comprehensively analyzing the ultrahigh frequency signal, the high-frequency current signal and the ultrasonic signal, the field interface can be effectively removed and the accuracy of local discharge detection is increased. By calculating the time differences of the detected ultrahigh frequency signal and ultrasonic signal for local discharge or the time difference between the detected ultrahigh frequency signal and ultrasonic signal, accurate positioning for a local discharge source can be realized.