Research on Wireless Low Power Detection Technology of Transformer Winding Deformation Based on Frequency Response Method

Frequency response method is an effective method to detect transformer winding deformation. At present, most tests are conducted with active power supply and long-distance signal connection. Problems such as difficulty in obtaining power at the test site and power quality that cannot meet the requirements of high-precision testing occur from time to time. The problem of superimposing spurious parameters on long-distance signal connections to reduce data accuracy and consistency needs to be resolved. Based on the detection principle of the frequency response method, this paper develops a battery-powered wireless low-power on-board detection system, which solves the problems of on-site power supply and signal long-distance transmission distortion. The test results of the winding of the real transformer show that under the same conditions, the correlation coefficient of the second detection amplitude-frequency characteristic curve of the wireless low-power onboard detection system is 0.982, and the correlation coefficient of the standard detection system amplitude-frequency characteristic curve is 0.951. The system has high detection consistency and accuracy.