| 基于改进电气几何模型的绕击跳闸率的计算 |
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| 引用本文： | 李晓岚,尹小根,余仁山,何俊佳.基于改进电气几何模型的绕击跳闸率的计算[J].高电压技术,2006,32(3):42-44. |
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| 作者姓名： | 李晓岚 尹小根 余仁山 何俊佳 |
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| 作者单位： | 1. 华中科技大学电气与电子工程学院,武汉,430074
2. 九江电力公司生技科,九江,332000 |
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| 摘 要： | 讨论了经典的电气几何模型(EGM),在此基础上提出了3点改进建议。计算中采用IEEE推荐的击距公式,引入系数ksg描述雷击地线和雷击地面击穿强度的不同,用暴露距离计算雷电绕击率和绕击跳闸率。分析了ksg取值对计算结果的影响。利用改进的计算方法、分别计算了地面倾角、避雷线保护角和环境温度对线路绕击跳闸率的影响。结果表明,当ksg减小、地面倾角增大、避雷线保护角增大、温度降低时,绕击跳闸率增大。
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| 关 键 词： | 输电线路 绕击 电气几何模型 击距 |
| 文章编号： | 1003-6520(2006)03-0042-03 |
| 收稿时间： | 2005-02-07 |
| 修稿时间： | 2005年2月7日 |
Calculation of Shielding Failure Flashover Rate for Transmission Line Based on Revised EGM |
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| LI Xiaolan,YIN Xiaogen,YU Renshan,HE Junjia.Calculation of Shielding Failure Flashover Rate for Transmission Line Based on Revised EGM[J].High Voltage Engineering,2006,32(3):42-44. |
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| Authors: | LI Xiaolan YIN Xiaogen YU Renshan HE Junjia |
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| Affiliation: | 1(1.College of Electrical and Electronic Eng,Huazhong University of Sci.&.Tech, Wuhan 430074,China;2.Jiujiang Administration of Electric Power in Jianxi Province,Jiujiang 332000,China) |
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| Abstract: | This paper discusses the classical electric geometry method and improves it in three aspects.In the improved model,"strike distance" is calculated with the expression recommended by IEEE,a coefficient k_(sg) is introduced to describe the difference of electric intensity between lightning stroke on the transmission line and the ground,and the "uncovered distance" is adopted to calculate shielding failure flashover rate.Paper analyses the influence of k_(sg) on the calculated results.Making use of the improved model,the influence of some parameters to the flashover rate is calculated and analyzed.The results show that the flashover rate reduces with the reduction of k_(sg),increase of the obliquity,protection angle and,atmospheric temperature. |
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| Keywords: | transmission line shielding failure electric geometry method(EGM) striking distance |
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