Transformer winding ultrasonic detection system based on multi point array 3D imaging
                                         TU Zheng hong1, LI Lei2, XU Peng cheng2, LIU Yan wen2, WANG Xin1
（1.Center of Electrical & Electronic Technology, Shanghai Jiao Tong University, Shanghai 200240, China；2.Siping Power Supply Company, Jilin Electric Power Company, State Grid Corporation of China, Siping 136000, China）

Abstract: Aiming at the problems of low detection efficiency and limited detection scope of the current transformer winding ultrasonic method， the application of ultrasonic array technology in transformer winding deformation detection was studied. A transformer winding ultrasonic detection system based on multi point array 3D imaging was presented. The system was used to detect the winding by multiple ultrasonic waves. According to multi point array 3D coordinate generation alg orithm， the 3D state diagrams of the windings were obtained quickly. And the quantitative distortion diagrams were obtained by comparing the healthy windings with the deformed windings. Then the system was used to conduct on site testing on the winding of an actual power transformer. The results indicate that this system can detect the high voltage side windings without affecting the normal operation of the transformer， generate the 3D images of the windings efficiently and show the specific values of the winding deformation. This system can realize the quantitative representation of the transformer winding deformation and it is efficient， intuitive and sec ure.

Key words: transformer winding; ultrasonic testing; multi point array; 3D imaging; quantitative representation