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Abstract Flashover often occurs on external insulators. In order to study the outer insulation properties, especially the surface flashover properties of bushing structure, the models of samples with strong vertical electric field were established and their AC surface flashover characteristics were studied. A platform was set up for recording the surface flashover procedure, real-time voltage and current at three time scales: s level, μs level and ns level. The images of surface flashover under bushing models were recorded through high speed camera and ICCD; Feather-like tip patterns of the surface flashover were discovered and the voltage-current waveforms were recorded simultaneously. The rules of surface flashover under different materials with the same electrode structure were obtained. Meanwhile, by comparing the differences among multiple polymer insulation materials, the surface flashover-creepage length curve of bushing samples was quantitatively obtained. A model based on surface charge and surface flashover channels was established and verified by the experimental results.
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Received: 06 May 2019
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| Fund:国家重点研发计划资助项目（2017YFB0902702） |
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2020, Vol. 35 
