电网雷害分布图研究

为能够直观反映电网雷害分布,从地闪时空分布基础数据出发,通过确定电网雷害危险电流区间研究确定雷害危险事件频次分布及其分级的评估体系,提出了电网雷害分布确定方法。以华北雷电监测网2003~2006年共计375.2万次地闪记录数据为例,结合华北500、220 kV电网典型耐雷水平及其雷害故障历史记录数据,用电网雷害分布统计方法,研制了华北电网雷害图;分析了华北电网雷害事件与雷害分布图相关性。结果表明,电网雷害分布图与电网雷害故障历史记录间有良好的线性相关性。

Research on Power Grid Lightning Hazard Maps

To show lightning hazard visually,from the based data reflecting cloud-to-ground flashes spatial and temporal distribution,the dangerous flashes distribution and its classification evaluation system are studied by determining the intervals of dangerous currents,after which the method for determining the power grid lightning hazard map is proposed.On the basis of the 3.752 million cloud-to-ground flashes data in 2003~2006 years from the North China lightning location system,combined with calculation results of typical lightning withstand level and lightning faults records of 500kV transmission lines and 220kV transmission lines in north China,power grid lightning hazard maps in north China are studied and plotted using a statistical method.Accordingly,the relationship between lightning hazard distribution and lightning faults is analyzed.The results show that the power grid lightning hazard distribution is linearly correlated with historical lightning faults with correlation coefficient 0.736 for 220kV level and 0.872 for 500kV level.