基于结构可靠性分析的工频电磁曝露评估  

Structure Reliability Analysis for Power Frequency Electromagnetic Exposure Assessment

作　　者：彭陈仡 金立军[1] 

机构地区：[1]同济大学电子与信息工程学院,上海201804

出　　处：《高电压技术》2015年第3期1021-1027,共7页High Voltage Engineering

基　　金：国家自然科学基金(51177109)~~

摘　　要：为了改进传统工频电磁曝露评估忽略人体的时间、空间运动规律对曝露的影响,以及缺少将传输线或变电站作为整体开展分析的不足,提出了基于结构可靠性分析的曝露评估新方法。搭建本专业人员熟悉的35 k V空心电抗器磁场计算模型作为算例,基于磁场分布情况建立可靠性分析的曝露功能函数,采用验算点法确定3条评估路径的曝露可靠性指标与失效概率,并在此基础上分析整座电站曝露评估的串-并联建模方法。通过计算发现,3条路径的曝露失效概率分别为3.71%、1.26%、10.95%,作业人员在电抗器两相侧距中心点7-8 m区域活动时最安全。因此,分析认为曝露可靠性评估在传承传统电磁场计算的基础上结合了人体运动的概率分布,可以用以开展待评估区域真实曝露情况的定量对比分析。Current assessment methods for the power frequency electromagnetic exposure ignore the temporal and spatial distribution effects of human beings, and fail to analyze the transmission line or the substation as a whole. To improve deficiencies in traditional approaches, we put forward a new approach to assess the electromagnetic environment using the concept of structure reliability analysis. The well-known 35 k V air-core reactor magnetic field calculation model was set up as an example, and the exposure performance function of the reliability analysis was established based on the magnetic field distribution. A design point method was used to calculate the exposure reliability index and the failure probability of three paths under assessment. Thereby, the series-parallel model was introduced to study the electromagnetic exposure of the whole substation. It was shown that the failure probability of each path was 3.71%, 1.26%, and 10.95%, respectively. The safest path for exposure was at two-phase side and 7 to 8 meters far from the origin of the reactors. Therefore, the exposure reliability analysis, which was developed from the traditional electromagnetic calculations and was combined with the probability distribution of human motion, could be treated as an effective way to assess the exposure in real transmission and transformation projects.

关 键 词：工频 电磁环境 曝露评估 空心电抗器 结构可靠性分析 概率密度函数 

分 类 号：TM75[电气工程—电力系统及自动化]