Abstract
In this paper, the catenary insulator FQX-25 is selected to do artificial pollution experiments. Firstly, study on the partition of experimental data by using the variation characteristics of the leakage current then re-determine the partition threshold of the safe zone, forecast zone and danger zone which are 10 mA and 30 mA. Secondly, the RMS and the pulse time domain entropy are obtained and the relationship between them and pollution level is fitted by Matlab. The research shows that the RMS of the leakage current and the pulse time domain entropy have very good exponential fitting relation with the equivalent salt deposit density (ESDD). The results of this study can provide a new way to evaluate the pollution level of insulators.
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