滚球法在500 kV来宾变电站的应用研究

Application of Rolling Sphere Method in 500kV Laibin Substation

笔者采用滚球法对500 k V来宾变电站进行全面的防直击雷校核计算。根据被保护电气设备的雷电冲击耐压水平确定滚球半径,基于空间几何原理,对变电站各电压等级直击雷保护范围进行计算。基于雷电流大小与发生概率之间的关系,结合当地的气象条件,对可能遭受直击雷破坏的区域进行分析计算得到破坏性雷击的发生概率,以此评估变电站直击雷防护水平。最后结合来宾变电站现有的防雷保护措施,提出针对性的改造建议,从而有效加强全站的直击雷防护水平。

This paper checks and calculates the protection of lightning stroke in 500kV Laibin Substation based on rollingsphere method RSM .The rolling sphere radius is determined based on the basic lightning impulse level BIL of the protectedelectrical equipment and the space geometry theory is adopted to calculate the substation？ s lightning stroke protection zoneunder different voltage classes. The probability of destructive stroke in unprotected stroke zone is used to assess the lightningstroke protection level by considering local meteorological conditions which is based on the relationship of the stroke currentand its probability. It finally provides reconstruction suggestions for improvement of the substation？ s lightning stroke protectionlevel according to the existing stroke protection scheme.