配线接地雷电感应过电压特征分析  

Characteristics analysis on the lightning induced over voltage and its attenuation factors through metal pipe buried with overhead distribution lines

作　　者：陈绍东[1] 黄智慧[1] 张义军[2] 王建国[3] 李斌[1] 曾昌军[1] 陈杏容[1] 

机构地区：[1]广东省防雷中心,广东广州510080 [2]中国气象科学研究院,北京100081 [3]武汉大学高电压与绝缘技术研究所,湖北武汉430072

出　　处：《中国电力》2012年第5期43-47,共5页Electric Power

基　　金：公益性行业科研专项(GYHY201006005)

摘　　要：为了解架空配电线路雷电感应过电压特征,以及穿过金属管埋地的防护措施对入侵过电压的实际衰减作用,对自然闪电发生时穿过金属管埋地前后的过电压波形进行了观测和分析。观测表明,穿过金属管埋地约50 m后过电压的波形特征基本没有变化,但其幅值有了一定的衰减。衰减效能主要与闪电的距离有关,当闪电离观测点距离约1 km时,衰减比例约20%。衰减比例随着距离的增加而降低,3～7 km的闪电衰减比例平均约为6%,衰减比例还与闪电不同的方位有关。In order to understand the lightning induced voltage characteristics and actual attenuation effect of buried metal pipe on the possible over-voltage, the waveforms of over voltage before and after buried metal pipe when lighting happens are observed and analyzed. The analysis shows that the shape of over voltage waveform is basically unchanged around 50 m after buried metal pipe. However, the magnitude is attenuated. The attenuation factor is mainly related to the distance of lightning. When lighting happens 1 000 m away from the observation place, the attenuation ratio is about 20%. The attenuation ratio is decreased when the distance increases. The average of the attenuation ratio is about 6% when the lightning happens within 3-7 km. Moreover, the attenuation ratio is also related to the direction of lightning.

关 键 词：架空配电线路 雷电 感应过电压 穿金属管埋地 衰减 回击 

分 类 号：TM862[电气工程—高电压与绝缘技术]