基于长间隙放电试验适用于大尺寸输电线路的改进电气几何模型

发布时间：2018-01-16 12:17

本文关键词：基于长间隙放电试验适用于大尺寸输电线路的改进电气几何模型　出处：《中国电机工程学报》2017年12期 　论文类型：期刊论文

【摘要】：电气几何模型(electric geometry model,EGM)作为解决雷电屏蔽问题的工程模型,广泛应用于计算评估高压、超高压输电线路的雷电绕击性能。然而,随着特高压输电线路杆塔高度的提高和空气间隙的增长,运用现有EGM得到的绕击率和实际观测数据有较大出入。鉴于此,该文基于1~10m的棒-棒长空气间隙负极性20/2500μs操作冲击50%放电电压试验数据,并引入Idone的雷电通道回击速度概率分布,修正了现有击距公式;再根据棒-棒间隙和棒-板间隙的50%放电电压在4m处发生翻转的特点,结合试验结果修正了大地的击距系数,提出了一种适用于大尺寸输电线路的改进EGM。最后运用该文提出的改进EGM分别对日本500、1000和中国1000k V交流输电线路的绕击率进行计算,与日本长期的雷击观测数据对比表明:该文提出的改进EGM较现有EGM更加适合大尺寸输电线路,尤其是各相导线绕击比例和观测数据更加吻合。该文提出的改进EGM能为大尺寸输电线路雷电屏蔽设计提供参考。
[Abstract]:Electric geometry model (EGM), as an engineering model to solve the problem of lightning shielding, is widely used in the calculation and evaluation of high voltage. Lightning performance of EHV transmission lines. However, with the increase of tower height and air gap of UHV transmission lines. The error rate obtained by using the existing EGM is quite different from the actual observation data, in view of this. Based on the negative polarity 20/2500 渭 s of Rod / Rod long Air Gap (Rod / Rod), the test data of impulse 50% discharge voltage are used in this paper, and the probability distribution of lightning return velocity of Idone is introduced in this paper. The existing formula of striking distance is revised. According to the characteristic that the 50% discharge voltage of the rod-rod gap and the rod-plate gap flips at 4m, the strike distance coefficient of the earth is modified according to the test results. In this paper, an improved EGM for large size transmission lines is proposed. Finally, the proposed improved EGM is applied to the Japanese 500. The failure rate of 1000 kV AC transmission line and 1000kV AC transmission line in China is calculated. The comparison with Japan's long-term lightning strike data shows that the improved EGM proposed in this paper is more suitable for large size transmission lines than the existing EGM. The improved EGM proposed in this paper can provide a reference for the design of lightning shielding for large-size transmission lines.
【作者单位】：武汉大学电气工程学院;山东理工大学电气与电子工程学院;广东电力科学研究院;
【基金】：中国博士后科学基金项目(2014M560624) 国家电网公司2015年总部科技项目(SGTYHT/14-JS-188)~~
【分类号】：TM75;TM863
【正文快照】： of each phase conductor.Thus,this improved EGM is moresuited for large-sized transmission lines and can provide a morereliable foundation for lightning shielding design.0引言为构建更安全、高效坚强的电网,进而推动与周边国家电网互动,推动全球能源互联网的构建

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