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电网技术  2012 

基于连续先导的线路绝缘闪络判据的研究

, PP. 271-276

Keywords: 连续先导,闪络判据,伏秒特性,输电线路,线路耐雷水平

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Abstract:

在输电线路防雷性能的研究中,绝缘子闪络判据直接决定了计算线路耐雷水平的准确性。为此根据长空气间隙的物理放电机理,并综合绝缘子串的结构特点,建立了基于连续先导发展的绝缘子串闪络模型。利用该模型计算得到绝缘子串的伏秒特性曲线,并与实际测量数据相比较,验证模型的准确性。以500kV线路为例,计算了不同闪络判据方法下的反击耐雷水平,结合国内外高压输电线路运行经验,分析了各方法的准确性和适用范围。并根据该模型进一步研究了杆塔冲击接地电阻与绝缘子串型号对线路耐雷水平的影响。研究结果表明,与传统的仅考虑绝缘子串长而对其具体结构影响考虑不充分的先导闪络判据相比,文中所建立的基于连续先导的绝缘子闪络判据模型准确性更高。

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