Long Luo
ABSTRACT
Artificial pollution tests of insulators can simulate the actual pollution of insulators in nature well. However, researchers focus on using this test to study influencing factors of flashover characteristics of insulators, and there are few papers demonstrate the direct relationship between humidity degree of pollution layer on insulators and leakage current. Therefore, through artificial pollution tests of insulators, adopting composite insulators with different pollution levels, using fog chambers to control the humidity degree of insulators, the corresponding relationship between leakage current and humidity degree of pollution layer is established, which provides an effective idea for damp detection of insulators and early warning of pollution flashover in the future. The results show that under the same pollution level, there is an obviously positive correlation between the leakage current value and wave pattern distortion of insulators and the humidity degree of insulator contamination. And when the humidity degree is low, the pollution level of insulators has little correlation with the leakage current value, and the leakage current value has little difference under any pollution level. The results also show that when the humidity degree is increasing, the pollution level has a significant impact on the leakage current value, and the leakage current value of insulators with more serious pollution rises faster.
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