利用行波传输参数方程对高压电缆靠近端头故障点进行定位的新方法  

A Novel Location Method for Faults Near the End of High Voltage Cable by Using Traveling Wave Transmission Parameter Equation

作　　者：燕飞 燕富子 Yan Fei;Yan Fuzi(School of Mechanical and Automotive Engineering,Hengxing University,Qingdao,Shandong 266199,China;Qingdao Hengxing Soft Creation Technology Co.,Ltd.,Qingdao,Shandong 266199,China)

机构地区：[1]青岛恒星科技学院机械与汽车工程学院,山东青岛266199 [2]青岛恒星软创科技有限公司,山东青岛266199

出　　处：《机电工程技术》2024年第9期295-297,316,共4页Mechanical & Electrical Engineering Technology

摘　　要：针对6~35 kV高压交联聚乙烯绝缘电力电缆局部放电故障点的位置靠近端头时难以准确定位的难题,根据行波传输的参数方程理论,提出了一种故障点定位的新方法。首先在非高压试验线引入的一端,使用铜单丝连接故障相与健全相,然后放入试验油杯中,使得局部放电脉冲波的传播路径长度延长1倍;然后,利用故障测试仪进行故障点定位,捕获局部放电脉冲波形,计算出脉冲波在交联电缆中的单个传播周期。此方法不仅能够确定故障点的位置是靠近远端还是近端,还能够准确地计算出故障点距离端头的位置。模拟试验和生产实践证明,所提方法不需要增加仪器,定位结果有效。Based on the parametric equation theory of traveling wave transmission,a new method is proposed to locate the partial discharge fault point of 6 kV to 35 kV high-voltage crosslinked polyethylene insulated power cable.Firstly,the faulty phase and the healthy phase are connected by copper monofilms at the leading end of the non-high-voltage test line,and then put it into the test oil cup,in this way,the propagation path length of the partial discharge pulse wave is extended by one times.Then,the fault point is located by the fault tester,the partial discharge pulse waveform is captured,and the single propagation period of the pulse wave in the crosslinked cable is calculated.This method can not only determine whether the location of the fault point is near the far end or near end,but also accurately calculate the distance of the fault point from the end head.Simulation test and production practice show that the proposed method does not need to add instruments,and the positioning results are effective.

关 键 词：交联电缆 局部放电 行波 故障点定位 

分 类 号：TM751[电气工程—电力系统及自动化]