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首页> 外文会议>2011 7th Asia-Pacific International Conference on Lightning >Lightning Protection of 1000 kV AC Power Transmission Lines and Substations
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Lightning Protection of 1000 kV AC Power Transmission Lines and Substations

机译：1000 kV交流输电线路和变电站的防雷保护

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First of all, in combination with characteristics of the lightning performance of UHV power transmission lines and on the basis of the analysis of experiences and lessons concerning excessively high lightning trip-out rate on 1000 kV transmission lines in Japan and the former Soviet Union, authors of this paper put forward that one of the critical points in the key technical research on 1000kV transmission lines in China should be the reduction of lightning fault rate, and definitely present the prevention of shielding failure flashover as the main orientation in the research on lightning protection. The paper presents that the reduction of ground wire shield angle and distance of the gap with an appropriate length is an important measure for reducing shielding failure trip-out rate of 1000kV transmission lines. Therefore, it is particularly necessary to pay attention to the shielding failure flashover of the lines in mountainous areas with bigger inclination of ground along the lines.In this paper, authors introduce the ground wire shield angles used for UHV transmission lines in plain and mountainous areas in China as well as the operation situation of UHV transmission lines in China in recent two and a half years.Lightning trip-out faults have never occurred up to the present time in China’s UHV transmission lines, thus preliminarily showing a good lightning performance. The authors also introduce the method and principle used for calculating lightning inrush overvoltage to UHV substations in China and put forward that the concurrent adoption of measures of both reducing the maximum lightning current of shielding failure at the incoming line section and optimizing the arrangement of lightning arresters to restrict the lightning inrush overvoltage to substations, thus either meeting the demand of restricting overvoltage and reducing the quantity of MOAs used.
机译：首先，结合特高压输电线路的防雷性能特点，并在分析日本和前苏联1000 kV输电线路过高雷击跳闸率的经验教训的基础上，本文提出在我国1000kV输电线路关键技术研究中的关键点之一应该是降低雷击故障率，并明确提出防止屏蔽故障闪络作为雷电保护研究的主要方向。 。提出减小接地线屏蔽角和适当距离的间隙距离是降低1000kV输电线路屏蔽故障跳闸率的重要措施。因此，在沿线地线倾角较大的山区，应特别注意线路的屏蔽故障闪络。本文介绍了平原和山区特高压输电线路的地线屏蔽角。在我国，以及近两年半来我国特高压输电线路的运行情况，到目前为止，我国特高压输电线路从未发生过雷击跳闸故障，初步表现出良好的防雷性能。作者还介绍了计算中国特高压变电站雷电涌入过电压的方法和原理，并提出了同时采取的措施，以减少进线段屏蔽故障的最大雷电流，并优化避雷器的布置。限制变电站的雷电过电压，从而既可以满足限制过电压的需求，又可以减少MOA的使用量。

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