Arithmetic and experiment research on ultrasonic detection of partial discharge for switchboard

Partial discharge detection for switchboard is effective method in insulation fault diagnosing. In this paper, different kinds of typical partial discharge for switchboard based on ultrasonic method is studied. Partial discharge detection system simulation model is established, including partial discharge model, measuring system for ultrasonic signals. Numerous figures of domain and frequency about ultrasonic signals are obtained and analyzed. Two ultrasonic bands of 20 k~40 kHz and 80 k~140 kHz for the partial discharge detection are chosen as characteristic parameters and input of support vector machine (SVM). SVM is used to recognize the discharge models and the recognition rate can reach up to 100%. The results prove that this method can recognize partial discharge effectively, which provides a new arithmetic for detecting ultrasonic signals.