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首页> 外文会议>International Conference on AC and DC Power Transmission >Feasibility research of lightning rods installed on the frames of main transformers in 1000KV UHV substation
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Feasibility research of lightning rods installed on the frames of main transformers in 1000KV UHV substation

机译：1000KV特高压变电站主变压器机架安装避雷针的可行性研究

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Because 1000kV UHV substations cover enormous area, it is hoped that lightning rods be installed on the frames of main transformers to reduce installation of excessive independent lighting rods, and thus to reduce substation area and cost. Referring to years of operating experience of many 110500kV substations, lightning rods might be installed on the frames of main transformers to shield direct lightning strokes for 1000kV UHV substations. But for 1000kV UHV substations with high soil resistivity, it is necessary to research on whether lightning rods could be installed on the frames of main transformers.If lightning rods installed on the frame of main transformers of UHV substations as direct lightning protection devices, the lightning rods should be connected to the grounding grid, and install centralized grounding device nearby. When lightning strokes occurring, there will be uneven voltage distribution between the various parts of the grounding device, and there will be backflashover overvoltage between the grounding device and the equipments installed on the grounding device. So for 1000kV UHV substations, whether lightning rods could be installed on the frames of main transformers, the computation of ground potential rise and backflashover should be carried out. The researches mentioned above relied on Fuzhou 1000kV UHV substation. Supposed lightning rods be installed on the frames of main transformers, when the soil resistivity were 50, 400, 1000 and 4200Ω·m, and the lightning current was 250kA, the ground potential rise and the backflashover overvoltages were computed. Results have been already used in the design of Fuzhou 1000kV UHV substation.
机译：由于1000kV特高压变电站的面积很大，因此希望在主变压器的机架上安装避雷针，以减少过多的独立避雷针的安装，从而减少变电站的面积和成本。参考许多110500kV变电站的多年运行经验，避雷针可能会安装在主变压器的机架上，以屏蔽1000kV特高压变电站的直接雷击。但对于土壤电阻率较高的1000kV特高压变电站，有必要研究是否可以在主变压器的机架上安装避雷针。如果在特高压变电站的主变压器的机架上安装避雷针作为直接的避雷装置，则应采用防雷措施。接地棒应连接到接地网，并在附近安装集中式接地装置。发生雷击时，接地设备各部分之间的电压分布会不均匀，并且接地设备与安装在接地设备上的设备之间会产生反向击穿过电压。因此对于1000kV特高压变电站，是否可以在主变压器框架上安装避雷针，应进行地电位上升和反闪计算。以上研究均以福州1000kV特高压变电站为依托。假设将避雷针安装在主变压器的框架上，当土壤电阻率为50、400、1000和4200Ω·m，雷电电流为250kA时，计算出地电位的升高和反向击穿过电压。结果已用于福州1000kV特高压变电站的设计中。

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