雷击下500kV杆塔接地装置的散流有效性

发布时间：2018-04-25 00:11

本文选题：雷电流 + 散流　；参考：《高电压技术》2017年05期

【摘要】：合理布置杆塔接地装置可提高其散流效率和降低其冲击接地电阻,从而有效降低线路雷电反击跳闸率。为此,建立了500 kV典型杆塔接地体的仿真模型,研究了杆塔接地装置冲击泄漏电阻分布规律以及外部射线长度对整体散流分布的影响规律,分析了土壤电阻率与有效散流长度之间的关系,并对比了延长单根射线长度的降阻效果与增加射线数量的降阻效果。结果表明:冲击泄漏电阻可反映杆塔接地装置各个导体段的散流能力;土壤电阻率越低则其射线有效散流长度越短;在射线总长度一定的情况下,当外部射线长度小于有效散流长度时,延长单根射线长度的降阻效果要优于增加射线数量。研究结果可为杆塔接地装置的设计及改造提供理论支持。
[Abstract]:Reasonable arrangement of pole tower earthing device can improve its diffusing efficiency and reduce its impulse grounding resistance, thus effectively reducing the lightning strike tripping rate of transmission line. In this paper, a simulation model of 500 kV typical tower earthing is established, and the distribution law of impulse leakage resistance and the influence of external ray length on the overall dispersion distribution of the tower earthing device are studied. The relationship between soil resistivity and effective diffusing length was analyzed, and the effect of reducing resistance by prolonging the length of single ray was compared with that of increasing the number of rays. The results show that the impulse leakage resistance can reflect the diffusing capacity of each conductor section of the grounding device, the lower the soil resistivity is, the shorter the effective ray scattering length is, and the longer the total ray length is, When the external ray length is smaller than the effective scattering length, the drag reduction effect of prolonging the length of single ray is better than that of increasing the number of rays. The results can provide theoretical support for the design and reconstruction of the grounding device.
【作者单位】：西南交通大学电气工程学院;国网山东省电力公司潍坊供电公司;云南电网有限责任公司电力科学研究院;
【基金】：国家自然科学基金杰出青年基金(51325704)~~
【分类号】：TM862

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