Study on the measurement of HV insulator´s leakage current based on the adaptive noise cancellation theory

In the electric power system HV transmits, contamination flashover in the HV insulator is getting worse and worse, so a way to find an HV insulator which is being invalid is of great importance in the measurement of HV insulator leakage current. On the basis of the theory of adaptive noise cancellation and adaptive line enhancement, we have provided an improved adaptive noise cancellation used in the measurement of HV insulator leakage current, which is of good performance not only in the case of LF noise cancellation like the adaptive line enhancement, but also in the case of LF noise cancellation like the normal adaptive noise cancellation, and it is proved to be efficient and robust through emulation and simulation experiments.