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高压电器  2015 

输电线路雷击闪络分析中杆塔模型的研究

, PP. 166-172

Keywords: 杆塔模型,多波阻抗模型,改进单波阻抗模型,杆塔电位,同塔多回

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Abstract:

为更方便地计算输电杆塔各横担的电位以评估多回高塔的耐雷性能,建立了改进单波阻抗模型。基于电磁暂态计算程序,将新杆塔模型与传统的集中电感模型、单一波阻抗模型和多波阻抗模型对比,分析4种模型下塔身垂直方向上电位分布。采用反推法,由Hara多波阻抗模型推导出110、220、500 kV3种电压等级下常见双回同塔和四回同塔高塔改进单波阻抗的推荐取值。研究结果表明,改进单波阻抗模型下的杆塔塔身电位分布与多波阻抗模型最为接近,在进行整条输电线路或者多基杆塔的防雷特性评估工作时,用改进单波阻抗模型代替多波阻抗模型,可以极大地减小计算量,实用性更强。

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