Optimum Algorithm Research In Ultrasonic Locating Of Power Transformer Partial Discharge

Power transformer is a kind of most important instruments in power system, and its safety running will directly influence the credibility of power supply. The main causation resulting in electrical invalidation is produced by insulation malfunction. Partial discharge in air-clearance decomposed by insulating oil in power transformer under strong field intensity occupies most of the total of power transformer malfunction. So it is crucial for keeping power transformer normally operation of how to monitor the discharge location and electric capacity rapidly, effectively and precisely.In the paper, the author discusses on the partial discharge phenomenon in power transformers, and promotes the solution of key technologies in ultrasonic locating of partial discharge, that is using correspondence function method to calculate the time-delay, and calculating the discharge source by traditional or modern optimum method according to the time-delay. At the end, the author analyses some other related technologies, such as multi-source locating and monitoring sensitivity, and gives some constructive suggestions. As proved and experimented, the method shows advantages and affectivity, and it is suggested to be widely used in PD locating online monitoring.