天峻县地面气象观测场接地网雷电暂态效应分析

Study on Lightning Transient Effect of Grounding Grid of Surface Meteorological Observation Field in Tianjun County

地面气象观测场四周平坦空旷,测风塔高耸孤立,存在雷击风险隐患。文章以青海省天峻县地面气象观测场为例,通过CDGES软件,对比分析了接地网优化前后接地网及等电位连接线导体上的电位分布,研究了地面气象观测设备遭受地电位反击损害的风险。结果显示,原接地网采用单点引出至条形接地网的方法存在安全隐患,采用环形接地网和多点接地的优化接地网后,能够在观测场接地网均压、降低电位差、预防地电位反击方面达到良好的效果,可有效降低地电位反击风险。研究结果可以为地面气象观测场接地网的优化设计提供参考依据。

Taking the ground meteorological observation field in Tianjun County as an example, this paper compares the potential distribution on the grounding grid and equipotential connecting line conductor before and after the optimization of the grounding grid through cdges software, and analyzes the risk of the ground meteorological observation equipment’s ability to resist the ground potential counterattack. The analysis results show that the original grounding grid has potential safety hazards by using the method of single point leading out to strip grounding grid. The adoption of ring grounding grid and multi-point grounding optimization measures can achieve good results in the aspects of voltage equalization of grounding grid in observation field, reducing potential difference and preventing ground potential counterattack. The research results could provide some reference for the optimal design of grounding grid in ground meteorological observation field.