楼宇LPS内部低压配电系统雷击感应过电压分析

发布时间：2018-11-20 19:18

【摘要】：雷电流经楼宇的笼式钢筋结构散入大地的过程会在泄流通道周围产生功率较强的雷电电磁脉冲(LEMP),该脉冲极易耦合进入周围配电线路从而引起过电压。对实际楼宇LPS及内部低压配电系统进行了简化,基于传输线PI型耦合电路参数提取与ATP-EMTP拓展计算建立了配电线路过电压分析模型,并对模型进行了验证。然后利用该模型,计算分析了典型雷电流波形、LPS结构的几个关键要素、配电的布线结构、以及负载特性对负载端感生冲击电压的影响。结果表明:雷电流波头越陡峭感生电压越大;改进LPS构架使得雷电流均衡对称分布可以显著提高防雷效果;感应过电压与垂直感应回路面积成正比而与水平感应回路面积关系较小;容性负载的共振现象会带来较大的过电压。
[Abstract]:Lightning current through the building of cage steel structure scattered into the earth process in the discharge channel around the generation of strong lightning electromagnetic pulse (LEMP), which is easily coupled into the surrounding distribution line resulting in overvoltage. The LPS and internal low voltage distribution system of real buildings are simplified. Based on the parameter extraction of PI coupling circuit of transmission line and the extended calculation of ATP-EMTP, the analysis model of distribution line overvoltage is established, and the model is verified. Based on this model, the typical lightning current waveform, several key elements of LPS structure, the distribution wiring structure, and the influence of load characteristics on the load terminal induced impulse voltage are calculated and analyzed. The results show that the steeper the lightning current wave head is, the larger the induced voltage is, and the better the LPS frame is, the more symmetrical the lightning current distribution is, the better the lightning protection effect is. The inductive overvoltage is directly proportional to the area of the vertical induction circuit and has a small relationship with the area of the horizontal induction circuit, and the resonance phenomenon of capacitive load will lead to a larger overvoltage.
【作者单位】：上海电力学院电气工程学院;
【基金】：上海市自然科学基金(编号:14ZR1417600)
【分类号】：TM863

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