1. Influence of fan‐shaped non‐uniform pollution on the electrical property of typical type HVDC insulator and insulation selection
- Author
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Zhijin Zhang, Xingliang Jiang, Dongdong Zhang, Maoqiang Bi, Jiayao Zhao, and Wei Zhang
- Subjects
010302 applied physics ,Pollution ,Engineering ,business.industry ,020209 energy ,media_common.quotation_subject ,Electrical engineering ,Energy Engineering and Power Technology ,Insulator (electricity) ,02 engineering and technology ,Residual ,01 natural sciences ,Flashover voltage ,Control and Systems Engineering ,Transmission line ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Arc flash ,Electrical and Electronic Engineering ,Composite material ,business ,Voltage ,Crosswind ,media_common - Abstract
Affected by long-term crosswind, insulator surface will get coated with fan-shaped non-uniform pollution, which lowers insulator flashover voltage as previous study revealed. In this study, a further research in specific to HVDC line insulation is presented. Taking typical dc insulator as the sample, its dc flashover performance under fan-shaped non-uniform pollution was tested. Then the influence of that kind non-uniformity was investigated through analysing the pollution layer residual resistance, the flashover process and critical flashover voltage. Finally the relevant HVDC insulation selection was made. Research results indicate that: under fan-shaped non-uniform pollution, insulator flashover voltage ( U 50) gets impaired, and is more obviously impaired by ratio J of windward to leeward side salt deposit density (SDD) than leeward side area proportion T ; under various T and J , there is still an exponential relationship between U 50 and SDD; under fan-shaped non-uniform pollution the pollution layer residual resistance decreases, which theoretically promotes the arc propagation and flashover process, and thus finally lowers flashover voltage; for the transmission line in area with fan-shaped non-uniform pollution, adding insulator units to strengthen the withstand property are needed.
- Published
- 2016