不同缺陷类型导线的紫外成像检测  

UV Imaging Detection on Transmission Line of Different Defect Types

作　　者：张志劲[1] 张伟[1] 黎振宇[1] 肖遥 邓军 夏谷林 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044 [2]南方电网超高压输电公司检修试验中心,广东省广州市448000

出　　处：《电网技术》2015年第9期2647-2652,共6页Power System Technology

基　　金：国家创新研究群体基金(51321063)~~

摘　　要：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。The transmission line plays an important role in the power delivery. Some faults of transmission lines are found in the practical operation, such as burr, protuberance on the conductive surface and broken strands. There will be corona discharge at the location of the defect conductor. The corona discharge will cause the waste of power energy, radio interference and audible noise. These defects are great threats to the safety and stability of power system. Using appropriate method to detect the operational state of transmission line is always significantly concerned by operation department. In this paper, the burr, protuberance and broken strands defects are manually simulated while the photon numbers of corona discharge under different defects are measured by the ultraviolet imager. The corona discharge characteristics of transmission line under different defect types are analyzed based on the measured photon numbers. Result shows that： the photon number increases with the rising of the applied voltage. The discharge inception voltage decreases with the rising of the defect degree. By applying same voltage, the detected photon number varies with different kinds of defects. Under the operation condition simulated in this paper, ultraviolet imager can effectively detect wire burrs and broken strands defects. The ultraviolet imager shows excellent performance in the detection of conductor defects and thus it can be prospectively used in the operation state detection of transmission lines.

关 键 词：导线 缺陷 电晕检测 紫外成像 

分 类 号：TM85[电气工程—高电压与绝缘技术]