【摘要】 对某500 kV输电线路一次典型雷击事故的事故原因进行了分析。提出了改进的电气几何模型,成功地解释了EGM难以解释的现场事故原因。应用改进的电气几何模型分析了输电线路杆塔结构、避雷线和导线的布置、雷电流的幅值、地面倾角对绕击率的影响。结果表明,在地形复杂的山区,大雷电流也能对线路造成绕击。更多还原

【Abstract】 A typical lighting strike accident is introduced and the reasons of the incidences are discussed.The improved electrogeometrical model(EGM) is proposed and successfully explained some field accidents which can not be defined before by EGM.Also analyzed are the effect of tower structure,lightning current amplitude,angle of the lightning incidence,as well as the ground angle on the shielding failure rate.It is concluded that large lighting current can stride across lighting conductors to strike conductors under certain conditions in mountain areas.更多还原