城市建筑物(群)对雷电电磁环境与耦合电压的影响研究  

Effect of Urban Buildings(Group) on Lightning Electromagnetic Environment and Coupling Voltage

作　　者：苏建峰[1,2] 侯文豪[1,2] 陈媛[1,2] 张其林[1,2] 秦微[1,2] 姜苏[1,2] 

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心中国气象局气溶胶与云降水重点开放实验室,南京210044 [2]南京信息工程大学大气物理学院,南京210044

出　　处：《电瓷避雷器》2016年第6期146-155,共10页Insulators and Surge Arresters

摘　　要：以Agrawal耦合模型为基础,利用二维时域有限差分方法,研究了城市建筑物对理想地面架空线附近的雷电电磁环境和架空线上感应出的耦合电压的影响,并分析了建筑物位置、建筑物高度以及回击电流参数等因素对电磁环境及耦合电压的影响差异。结果表明:建筑物的存在削弱了架空线附近的垂直电场,当建筑物分别位于架空线两侧时,水平电场方向相反;建筑物高度的增加对架空线附近的水平电场波形影响不大,当建筑物高度或者建筑物与闪电通道距离增大时,垂直电场均减小;对于15 m高的建筑物,当它与闪电通道分别位于架空线路同侧及异侧时,在继后回击下相比建筑物不存在时的耦合电压之比分别为46.1%和61.3%,在首次回击下的比值分别为47.0%和56.1%,建筑物对架空线路上的耦合电压产生较大的衰减;无论建筑物位于架空线的哪一侧,建筑物高度越高,距离架空线越近,衰减作用越明显。Based on the Agrawal coupling model, the influence of the buildings on lightning electromagnetic field and induced voltage on overhead line caused by lightning strike to earth are analyzed by using 2D FDTD method. The influence of location and height of the building and parameters of the return stroke current on electromagnetic environment and coupling voltages are further studied. It is found that the vertical electric field near the overhead line is decreased by the building. When the building lies on each side of the overhead line, the direction of horizontal electric field is opposite. The increase of the height of the building has few effects on the waveform of horizontal electric field near the overhead line, but the vertical electric field decreases with the increase in the building height and the distance between the building and the lightning channel. For the 15m high building, when the building and the lightning channel are located on ihe same side and different side of the overhead line, the ratio of the induced voltages peak value with buildings to that without buildings at subsequent return stroke is 46.1% and 61.3%, while the ratio at first return stroke is 47.0% and 56.1%, respectively. There is an obvious attenuation on coupling voltages over the overhead line caused by buildings. Regardless of the side, the attenuation becomes stronger when the building is higher or closer to the overhead line.

关 键 词：建筑物 架空线 雷电电磁环境 耦合电压 

分 类 号：TU895[建筑科学]