10kV XLPE电缆冷缩中间接头典型工艺缺陷的局部放电特性研究

发布时间：2018-11-07 10:07

【摘要】：10 k V XLPE电缆中间接头作为电缆绝缘的薄弱环节,任何绝缘缺陷都会产生局部放电,导致绝缘劣化甚至击穿。为研究不同缺陷下的放电特性,以一段150 m长的XLPE电缆作为试验对象,在75 m处设置可拔插式中间接头,试验设计和模拟压接管尖角未打磨、主绝缘环形划痕、压接处错用绝缘胶带3种典型缺陷模型,采用脉冲电流法对其放电信号进行检测。结果表明:压接管尖角未打磨时放电呈单极性,主绝缘存在纵向划痕时放电呈"馒头状"的双极性,压接处错用绝缘胶带时放电呈"平台状"的双极性;压接管尖角未打磨时放电频率较低,随电压升高线性增加;主绝缘存在纵向划痕时,随电压升高放电频率呈线性增加,压接处错用绝缘胶带时与主绝缘存在纵向划痕时的放电频率相差不大,随着电压升高放电频率会呈现先慢后快的增长趋势。
[Abstract]:As the weak link of insulation of 10 k V XLPE cable, any insulation defect will produce partial discharge, leading to insulation deterioration or even breakdown. In order to study the discharge characteristics of different defects, a 150m long XLPE cable was used as the test object. A pullable interconnect was set up at 75 m. The test design and simulation of the unpolished angle of the pressure nozzle and the ring scratches of the main insulation were carried out. Three kinds of typical defect models of insulation tape were used to detect the discharge signal by pulse current method. The results show that the discharge is unipolar when the tip angle is not polished, the discharge is "steamed bread" bipolar when there is longitudinal scratch in the main insulation, and the discharge is "flat" bipolar when the adhesive tape is misused at the indentation. The discharge frequency is low when the tip angle is not polished, and increases linearly with the increase of voltage. When the main insulation has longitudinal scratches, the discharge frequency increases linearly with the increase of voltage. With the increase of voltage, the discharge frequency will slow first and then increase quickly.
【作者单位】：广东电网公司佛山供电局;
【基金】：广东电网公司职工技术创新项目(FSZC-2013-001)
【分类号】：TM855

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