In recent years,along with the rapid expansion of power grids,the increasing complication of grid structures,and the development of smart grids and energy technologies,the lightning protection of power grids becomes i...In recent years,along with the rapid expansion of power grids,the increasing complication of grid structures,and the development of smart grids and energy technologies,the lightning protection of power grids becomes increasingly prominent.Power grids of China have acquired significant achievements on lightning protection technologies,which are reviewed in this paper.A technical route of lightning protection is introduced in detail; it allows us to find problems through detection and measurement of lightning,to analyze problems through evaluation and simulation of lightning,to solve problems through lightning protection measures,and to prevent problems through hazard risk warning of lightning.Following the route,the technical breakthroughs of these four aspects in China are presented,including the chinese lightning detection network(CLDN),natural lightning observations,lightning faults detection at transmission lines,lightning current measurements,progresses in lightning distribution maps,lightning fault replays,lightning hazard risk evaluations,and lightning simulated experiments,as well as novel lightning protection measures.The practical devices and systems corresponding to the technologies mentioned above are also introduced and discussed.Due to the progress of lightning protection technologies in recent years,despite the rapidly growing length of transmission lines in China,the lightning accident rate is controlled at a certain level.展开更多
电网雷电监测网已积累了大量雷电数据,为研究和获取雷电特征,采用统计分析、数据挖掘并结合近年来大数据分析方法,对2005—2014年10年雷电监测数据进行了分析。分析结果表明：全国10年合计落雷1.28亿次,正极性比率呈现总体上升趋势,平均...电网雷电监测网已积累了大量雷电数据,为研究和获取雷电特征,采用统计分析、数据挖掘并结合近年来大数据分析方法,对2005—2014年10年雷电监测数据进行了分析。分析结果表明：全国10年合计落雷1.28亿次,正极性比率呈现总体上升趋势,平均为7.50%;各区域雷电活动差异较大,总数南方最高,地闪密度华东最高,全国平均地闪密度为1.33次/（km2·a）;雷电流幅值10年分布规律比较接近,累积概率分布拟合曲线a、b值为31.33 k A和2.76,与国际上IEEE和CIGRE推荐取值非常接近。对武汉和杭州两城雷电与降水量相关性分析表明：2者高峰期大体一致,月分布除个别年份外呈现中强相关性;两城雷电正极性比率与降水量相关性一致,除个别年份外呈现弱相关性;平均电流与降水量武汉为弱相关性、杭州除个别年份外也为弱相关性。基于雷电监测数据,融入大气电场、卫星云图、气象雷达数据,采用数据挖掘技术预测雷暴团运动趋势实现雷电预警。具体实例表明,预警提前时间为10～30 min,预警平均空间误差为5～15 km,预警有效率达75%～85%。展开更多
基金Project supported by National Basic Research Program of China （973 Program） （2011CB209400）, National Fligh-tech Research and Developmerit Program of China （863 Program （2011AA040405）, National Natural Science Foundation of China （Ul134106）, 3551 Optics Valley Personal Plan of Wuhan East Lake High-tech Development Zone, Science and Technology Program of SGCC（SG[2009], SG[2013]）.
文摘In recent years,along with the rapid expansion of power grids,the increasing complication of grid structures,and the development of smart grids and energy technologies,the lightning protection of power grids becomes increasingly prominent.Power grids of China have acquired significant achievements on lightning protection technologies,which are reviewed in this paper.A technical route of lightning protection is introduced in detail; it allows us to find problems through detection and measurement of lightning,to analyze problems through evaluation and simulation of lightning,to solve problems through lightning protection measures,and to prevent problems through hazard risk warning of lightning.Following the route,the technical breakthroughs of these four aspects in China are presented,including the chinese lightning detection network(CLDN),natural lightning observations,lightning faults detection at transmission lines,lightning current measurements,progresses in lightning distribution maps,lightning fault replays,lightning hazard risk evaluations,and lightning simulated experiments,as well as novel lightning protection measures.The practical devices and systems corresponding to the technologies mentioned above are also introduced and discussed.Due to the progress of lightning protection technologies in recent years,despite the rapidly growing length of transmission lines in China,the lightning accident rate is controlled at a certain level.
文摘电网雷电监测网已积累了大量雷电数据,为研究和获取雷电特征,采用统计分析、数据挖掘并结合近年来大数据分析方法,对2005—2014年10年雷电监测数据进行了分析。分析结果表明：全国10年合计落雷1.28亿次,正极性比率呈现总体上升趋势,平均为7.50%;各区域雷电活动差异较大,总数南方最高,地闪密度华东最高,全国平均地闪密度为1.33次/（km2·a）;雷电流幅值10年分布规律比较接近,累积概率分布拟合曲线a、b值为31.33 k A和2.76,与国际上IEEE和CIGRE推荐取值非常接近。对武汉和杭州两城雷电与降水量相关性分析表明：2者高峰期大体一致,月分布除个别年份外呈现中强相关性;两城雷电正极性比率与降水量相关性一致,除个别年份外呈现弱相关性;平均电流与降水量武汉为弱相关性、杭州除个别年份外也为弱相关性。基于雷电监测数据,融入大气电场、卫星云图、气象雷达数据,采用数据挖掘技术预测雷暴团运动趋势实现雷电预警。具体实例表明,预警提前时间为10～30 min,预警平均空间误差为5～15 km,预警有效率达75%～85%。
