导线接头不同故障类型的紫外成像检测

UV Imaging Detection Research on Transmission Line Joints with Different Fault Types

导线接头在电网中起着机械和电气的连接作用,运行过程中由于导线接头松动、脱落等故障严重威胁电网安全可靠运行,并导致能量损耗,利用合理的手段检测导线接头运行状况一直是运行部门关注的焦点。该文模拟导线接头螺帽松动、螺杆松动、螺栓错位、扭力弯曲和剪切断股这几种典型故障缺陷,利用紫外检测仪检测其作用电压下紫外放电光子数差异。试验结果表明:随着作用电压的提高,导线接头各种故障下的紫外放电光子数随之增加;运行电压下,导线接头各种典型故障下测得的紫外光子数存在明显差异,利用紫外成像检测可以有效用于导线接头的故障检测。研究结果为输电线路的运行状态检测提供了参考。

The transmission line joints play the role of mechanical and electrical connection in power grid. In the actual operation,joint faults such as joint loose or joint shedding will cause the loss of power energy or even cause other faults that greatly threaten the safe and steady operation of the pow er system. So,the operation department of pow er system focuses on finding a practical method to detect the running state of transmission line joints. In this paper,the typical faults of transmission line joint were simulated,including joints nut loosing / shedding,screw loosing,bolt dislocation,bending and broken strands. The UV imager was applied to detect the corona discharge photon number of the fault joints. The results show that the photon numbers of joints under different faults increase with the rising of the applied voltages. Under the operation voltage,the photon numbers vary among the different type of joint faults,and the UV imager can be effectively identify the faulty of transmission line joints. The research results can provide references for the running state detection of transmission lines.