Research on Location Algorithm of PD Ultrasonic Based on Global Search of Multi-Platform

Partial discharge (PD) has become a main reason of power transformer insulation deterioration. The positioning of PD is an important aspect in transformer quality control and insulation mechanism research, and the ultrasonic array location algorithm of PD is important to PD positioning. The traditional positioning method is usually based on the dual-platform direction finding crossover algorithm, it is easy and convenient to take the intersection of two direction finding lines as PD source. However, in reality there are various of errors lead the two lines can´t meet together, so it will bring down the positioning accuracy for taking two skew lines approximately as intersecting and can´t meet engineering needs .In this paper, PD ultrasonic intelligent location algorithm of multi-platform direction finding based on genetic algorithm is presented ,which takes the corresponding point of minimal value of the total space distance to direction finding lines as PD source, then with the genetic algorithm to search globally to achieve positioning. This method makes the result of location unique, stable and more accurate.