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高压电器  2015 

直通式电缆接头局部放电测量方法研究

DOI: 10.13296/j.1001-1609.hva.2015.10.029, PP. 174-180

Keywords: 电缆接头,局部放电,测量

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Abstract:

电缆接头是电缆线路的故障高发部位,通过测量电缆接头的局部放电有利于准确评估电缆的绝缘状态。现有电缆接头局部放电测量方法大多需要改变接头的固有结构,或是测量灵敏度偏低。笔者基于电容耦合原理,在不改变接头结构的基础上提出了一种适用于直通式电缆接头的局部放电测量方法,构建了相应的测量系统。通过计算机仿真分析从理论层面证明了测量方法的正确性。在真实35kV直通式电缆接头内预设尖刺缺陷,开展了局部放电的对比检测试验,试验结果表明,文中提出的直通式电缆接头局部放电测量系统灵敏度不低于10pC。针对同一预设缺陷产生的局部放电信号,文中提出的测量系统与DST-4型局部放电检测仪生成PRPD谱图的相似度高达0.9,从实测层面证明了文中提出的直通式电缆接头局部放电测量方法的有效性。

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