AC Discharge Characteristic and Voltage Correction of Rod-Plane Short Air Gap Under Rain Conditions
Jiang Xingliang1, Yuan Yao1, Du Yong2, Ma Jianguo2, Bi Maoqiang1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqin University Chongqin 400044 2. EHV Transmission & Substation Company of Hubei Province Wuhan 430050 China
According to the operation experience and investigation in China, the insulation performance of transmission line will be decreased due to the strong rain effect, which has not been concerned in the external insulation design. Meanwhile, there is no correction method concerning the discharge voltage of air gap under rain conditions in the IEC standards. Therefore, a series of experimental tests in the artificial climate chamber and Xuefeng Mountain Natural Site were conducted with the use of rod-plane air gap to analyze the relationship between the AC discharge voltage and the rain intensity. According to the test results, the correction formula of AC discharge voltage of rod-plane air gap under rain condition is proposed and verified by experimental results. It is shown that: with the increase of rain intensity, the discharge voltage of air gap will decrease and the maximum decreased percentage is 10.32%; the corrected method is applied not only to the distance of 0.2～0.6 meters but also to the distance of 0.7 meter.
蒋兴良, 袁耀, 杜勇, 马建国, 毕茂强. 棒-板短空气间隙淋雨交流放电特性及电压校正[J]. 电工技术学报, 2012, 27(12): 36-42.
Jiang Xingliang, Yuan Yao, Du Yong, Ma Jianguo, Bi Maoqiang. AC Discharge Characteristic and Voltage Correction of Rod-Plane Short Air Gap Under Rain Conditions. Transactions of China Electrotechnical Society, 2012, 27(12): 36-42.
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2012, Vol. 27 
