Research on Pollution Flashover Characteristics of Large-Size Composite Outdoor Insulation for UHV DC in High Altitude Area
Zhang Chuyan1, Zuang Fuzeng2, Chen Changlong1, Wang Guili2, Li Ruihai2, Ma Yi3, Wang Liming1, Guan Zhicheng1
1. Graduate School at Shenzhen, Tsinghua University Shenzhen 518055 China 2. Electric Power Research Institute, China Southern Power Grid Guangzhou 510080 China 3. Yunnan Electric Power Test and Research Institute(Group)Co., Ltd Kunming 650031 China
Abstract：This paper investigates the DC pollution flashover performance of large-size suspension composite insulator and ±800kV post composite insulator by vast artificial contamination tests in actual high altitude area. Pollution flashover voltages under different SDDs (Salt Deposit Distribution) of two kinds of insulators are obtained. Two on-load voltage methods are used in the artificial contamination test, rise-voltage method and up-and-down method. Test results indicate that, firstly the DC pollution flashover voltages of suspension insulator obtained by rise-voltage method are general higher than the results of up-and-down method. But the influences of SDD on flashover performance of two on-load voltage methods are different. Secondly, the average maximum value of leakage currents for post composite insulators increases as SDD, while, the time when maximum value of leakage current occurred shortens as SDD increasing in up-and-down tests. Thirdly, by ultra violet (UV) camera observation, the partial discharge of top section is more severe than other parts for large-size post composite insulators. Finally, experimental research shows that the DC pollution flashover voltages and the length of post composite insulators are accord with good linear relationship while the distance of installation from ground level shows on significant influence on the DC pollution flashover voltages. According to the above conclusions, this work have enriched the research of pollution flashover characteristics of outdoor insulation in actual high altitude area and can provide technical support for the external insulation design, operation and maintenance of ±800kV Ultra High Voltage (UHV) DC transmission projects in high altitude area in China.
张楚岩, 张福增, 陈昌龙, 王国利, 李锐海, 马仪, 王黎明, 关志成. 高海拔地区直流特高压大尺寸复合外绝缘污闪特性研究[J]. 电工技术学报, 2012, 27(12): 20-28.
Zhang Chuyan, Zuang Fuzeng, Chen Changlong, Wang Guili, Li Ruihai, Ma Yi, Wang Liming, Guan Zhicheng. Research on Pollution Flashover Characteristics of Large-Size Composite Outdoor Insulation for UHV DC in High Altitude Area. Transactions of China Electrotechnical Society, 2012, 27(12): 20-28.
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2012, Vol. 27 
