摘要
雷击建筑物引起的电磁干扰和电磁兼容问题是建筑物雷电防护的重要研究课题。为此,研究了雷击建筑物时防雷系统暂态电流分布以及内部磁场分布的计算。采用传输线模型对防雷系统进行等效,采用时频变换技术对该模型进行求解,并根据电流分布的计算结果采用解析方法对建筑物内部磁场分布情况进行了求解。然后根据计算结果,从参数变化的角度对IEC标准给出的磁场近似计算公式的合理性和适用性进行了分析和验证。结果表明,IEC标准中的近似公式所忽略的"空间位置"和"接地电阻"两个因素对建筑物雷电保护系统内部最大磁场强度的计算精确度影响较大,而其他因素的影响较小。
EMI/EMC problems caused by a lightning struck a building are important research topics in building lightning protection area. This paper studies the calculations of the transient current distributions and the inner magnetic field of the lightning protection system （ LPS） struck by lightning. The transmission line model is well established to model the LPS, and the time- frequency method is introduced to solve the model. Then, the megnetie field distribution inside building is calculated with the analytical method based on the current distribution, finally, this paper analysises and certifies the rationality and applicablity of the approximate calculation formula advocated by IEC standards from the point of view of parameter changes according to the current distribution.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第4期914-918,共5页
High Voltage Engineering
