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电网技术  2015 

不同缺陷类型导线的紫外成像检测

DOI: 10.13335/j.1000-3673.pst.2015.09.041, PP. 2647-2652

Keywords: 导线,缺陷,电晕检测,紫外成像

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Abstract:

导线在电网中起着电能传输的重要作用,实际运行中的导线由于存在毛刺、断股、表面凸起等缺陷,在缺陷处会出现电晕放电现象,造成电能损失、无线电干扰、可听噪声,甚至严重威胁到电力线路的安全运行。采用恰当的方法对电力线路运行状态进行有效的检测,一直是电力部门所关注的问题。模拟了导线的毛刺、断股、表面凸起缺陷,采用紫外成像仪对不同故障类型下的电晕放电光子数进行测量。根据光子数测量结果,分析研究了不同缺陷类型下导线的电晕放电特性。研究结果表明缺陷导线的电晕放电光子数随着外施电压的升高而增加;从导线的光子数-电压曲线可以看出,随着缺陷程度的加深,导线的起晕电压降低;在同一外施电压下导线不同类型缺陷之间的电晕放电光子数有明显差异;在模拟的实际运行条件下,紫外成像仪能够有效检测出导线毛刺和导线断股缺陷,具有较好的区分度。紫外成像仪在导线缺陷的检测中表现出优良的性能,在电力线路的检测中具有良好应用前景。

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