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导线雷电冲击电晕特性试验研究

, PP. 164-170

Keywords: 特高压,雷电冲击,分裂导线,电晕笼,冲击电晕,电磁暂态计算

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Abstract:

雷电侵入波的特性对变电站内设备的绝缘裕度设计有较大的影响,而目前中国进行变电站设备雷电绝缘裕度设计中,忽略了输电线路的电晕会引起雷电侵入波衰减畸变,导致设计结果通常较为保守,因此有必要对雷电冲击电晕进行系统研究。在中国特高压交流试验基地开展了冲击电晕试验,对输电线路中常用的导线进行了雷电冲击电晕试验研究,总结了不同导线的雷电冲击电晕伏库特性曲线。试验结果表明:在雷电冲击下导线起晕较为明显,不同导线的伏库特性曲线表现出一定的规律性,且在正极性雷电冲击下导线表现出明显的起晕延时现象。基于试验结果可建立相应的线路冲击电晕模型,应用于电磁暂态软件中仿真计算线路冲击电晕对线路雷电侵入波的影响。

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