Ultrasonic localization of Partial Discharge in Power Transformer Based on Improved Genetic Algorithm

Partial discharge is one of the main reasons for degradation of power transformer, ultrasonic method has attracted attention for its anti-interference ability and convenience of location for partial discharge measuring. Resorting to the method of electrical-mechanical-ultrasonic analogy, an equivalent circuit for partial discharge-generated ultrasonic waves based on model of gap is established, and an ultrasonic-ultrasonic locating method based on improved genetic algorithm which takes the equivalent velocity of ultrasonic as a variable is introduced in this paper. Besides, the relationship between ultrasonic intensity of pressure and apparent discharge magnitude is discussed and the accuracy and feasibility of this ultrasonic location model has been demonstrated by the laboratory data.