江苏高速公路收费站一次雷击事故分析

本文对2010年8月3日19时30分沿江高速公路张家港收费站一次严重雷击事故的雷暴过程进行诊断分析,并对其防雷工程存在问题进行综合探讨。分析得出:这次雷暴发生在副热带高压边缘环流形势下,虽副热带高压强大,但大幅度东退,面积明显减小,脊线位置和流场也出现调整。江苏上空由西南气流转为西北气流影响,北方有弱冷空气沿西北气流南下,引发江苏降温,为大气不稳定的增强和触发不稳定能量的释放提供重要条件;本文还分析了雷暴与对流参数关系及演变特征,并探究不稳定参数在雷暴发生中的作用。根据现场调查,分析出这次收费站雷击事故在防雷工程方面存在设备接地、等电位、线路屏蔽、电涌保护器设置、安装和接地电阻等问题,最后针对这些问题提出6点防雷工程整改建议。

An analysis on a lightning accident at a Jiangsu highway toll station

This paper performed diagnosis analysis on the strong thunderstorm process of a lightning accident occurred at Zhangjiagang toll station of the highway along the Yangtze River in Jiangsu Province, and discussed comprehensively about the problems of its lightning protection engineering. The result showed that the thunderstorm occurred at the edge of subtropical high circulation, the subtropical high was strong, but it decreased eastward significantly, and the ridge location and the flow field changed accordingly. The northwest airflow of the eastern side of the subtropical high, combined with the weak cold air going southward from the north along the northwest airflow, made the temperature in Jiangsu going down quickly and provided important conditions for the enhancements for atmospheric instability and the triggering for the release of instable energy. This paper also analyzed the relation between strong thunderstorms and convective parameters and their evolution, and explored the role that the superior unstable parameters played in the strong thunderstorms. According to field investigations and analysis at the lightning accident at the toll station, several problems of the lightning protection engineering were found involving equipment grounding, equal potential, line screen, the setup and installation of surge protectors, grounding resistance, and so on. And we suggest 6 items of lightning protection engineering rectification according to the above-mentioned problems.