Flashover Performance of Long-String Insulators of DC Power Transmission Line at High Altitude

doi:10.3969/j.issn.1000－7229.2013.11.007

Abstract

Abstract:

Along with the commencement of DC power transmission projects in the western region, the external insulation of DC transmission line has become a problem at high-altitude area. However, there is no uniform understanding on how to correct high-altitude influence on the pollution voltage of DC long-string insulators. The pollution flashover test of long string insulators in high altitude was carried out and flashover model was established. The pollution voltages of insulators at different altitudes and different degrees of pollution were calculated and the data were contrasted with the test results, which verified the adaptability of the model. The linear relationship between pollution flashover voltage and atmospheric pressure was obtained through test results, and the pressure characteristic exponent n of two typical pollution （SDD=0.05, 0.1mg/cm2） were suggested.

Key words: high altitude, DC, flashover voltage, flashover model, pollution, transmission line insulator

LI Xuelin，YAO Tao，LI Jin，CAI Lin，JIA Ru， CHEN Jiaxing. Flashover Performance of Long-String Insulators of DC Power Transmission Line at High Altitude[J]. ELECTRIC POWER CONSTRUCTION, 2013, 34(11): 34-38.

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