摘要
在地闪连接过程中,正极性连接先导的始发和传播是决定建筑物是否遭受雷击的关键因素之一。但广泛应用于确定建筑物雷击点的滚球法并没有考虑上行正极性先导的始发过程。因此,基于充分考虑了闪电先导及其连接过程的物理先导模型,选取不同形状的建筑物对建筑物的雷击点概率问题进行了研究,通过估计复杂建筑物拐角等尖端处始发稳定的上行先导所必需的背景电场来确定建筑物雷击点的概率。结果表明:下行先导接近地面建筑物时上行先导首先起始的位置成为雷击点的概率比较高;除此之外,判断建筑物雷击点时不仅仅依赖于滚球法中强调的雷击电流的大小,建筑物的几何形状及周围因素对雷击点的估测也是不可忽视的。基于本文的研究结果可为建筑物的雷击状况的分析和今后解决复杂建筑物的雷电防护等实际应用问题提供了较好的依据。
In the Cloud-to-Ground （CG） lightning connection process, the positive polarity upward connecting leader inception and propagation is one of the key factors which determines whether a ground structure is striked by lightning downward leader. At present,the roiling sphere method widely used in buildings to determine the point of lightning strike does not consider the inception process of upward positive leader. Therefore, based on physics leader model which takes full consideration leader and connecting process, the author chooses different shapes of buildings to study the probability of the lightning strike points. By estimating stable upward leader background electric field at the comers of complex structures, the probability of the lightning strike points are determined. The results show： When the downward leader approaches ground buildings, the location of upward leader first initiated becomes the most likely lightning strike points. In addition, the geometry of the buildings and surroundings significantly influences the conditions necessary to estimate the lightning strike points. It is provided that a good basis on the analysis of situation for the building struck by lightning and the lightning protection solutions for buildings.
出处
《电瓷避雷器》
CAS
北大核心
2017年第3期14-20,共7页
Insulators and Surge Arresters
基金
电网雷电预警技术研究及雷电预警系统开发(编号:K-YN2013-186)
配电网综合防雷体系研究与工程示范(YNKJQQ00000274)
国家自然科学基金项目(编号:41275009)
关键词
雷击点
上行正极性先导
复杂建筑物
雷电防护
lightning strike points
upward positive leader
complex buildings
lightning protection
