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中国农学通报

中国农学通报 ›› 2015, Vol. 31 ›› Issue (23): 189-193.doi: 10.11924/j.issn.1000-6850.casb15040082

所属专题： 农业气象

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

雷电灾害风险评估中PB因子选取方法的分析及改进

冯鹤   

  1. 河北省防雷中心
  • 收稿日期:2015-04-10 修回日期:2015-07-20 接受日期:2015-05-25 出版日期:2015-08-20 发布日期:2015-08-20
  • 通讯作者: 冯鹤
  • 基金资助:
    2014河北省气象局科研项目 “大型化工园区雷电灾害风险区划及评估技术研究” (14ky20)。

Analysis and Improvement of Selection Method of Factor PB in Lightning Hazard Risk Assessment

冯鹤   

  • Received:2015-04-10 Revised:2015-07-20 Accepted:2015-05-25 Online:2015-08-20 Published:2015-08-20

PDF (PC)

403

摘要： 在分析雷电直接击中建筑物导致物理损害的概率PB的影响因素的基础上，本文基于IEC62305推荐的不同防护等级的保护能力以及雷电流概率分布规律，推导出确定规范中LPL对应的PB因子优选值的一般过程。并针对推导过程完全依赖于规范推荐的防护等级及雷电活动特性，针对性差的特点，提出了根据建筑物直击雷防护实际情况以及项目所在位置雷电环境的统计特征确定PB因子的方法，该方法在一定程度上提高了PB因子选取的科学、准确性。同时，也对由于雷击物理过程复杂性、电气-几何模型的科学性、防护装置性能变化等使得PB因子取值中存在的问题进行了分析。

关键词: 雷电灾害, 雷电灾害, 脆弱性, 层次分析法, 评估

Abstract: In this paper, the author analyzed relevant factors influencing the probability (PB) of physical damage caused by direct thunder on a building. Based on protective capability in different IP codes recommended in IEC62305 and distribution laws of lightning current probability, the author also deduced a general process used to determine the preferred value of PB corresponding to LPL in the specification. Based on complete dependence of the deduction process on IP code recommended in the specification, thunder activity features and the feature of poor pertinence, the author proposed a method that could be used to determine the value of PB according to the actual situation of direct lightning prevention for the building and statistical characteristics of the thunder environment at the project location. To some extent, this method improved scientific and accurate selection of PB. At the same time, the author also made an analysis of the following factors resulting in different issues of PB value selection: complicated physical process of lighting, scientific nature of electric-geometric model, and performance variation of protective device.