摘要
为提升现场复合绝缘子红外测试判定准确率,对现场新投运的123支500 kV复合绝缘子开展基于无人机的红外测试,并提取复合绝缘子温度曲线,统计温差、温度梯度特征,对正常复合绝缘子自身不同部位温度差异的原因进行了讨论,并给出了抑制温度曲线高频干扰的方法。结果表明,现场正常复合绝缘子有相当比例温差超过2 K。正常复合绝缘子温度曲线存在高频变化分量,其来源于伞裙与芯棒之间的温差、红外图像清晰度不足产生的局部温度振荡。通过小波分解与低频分量重构,可有效抑制上述高频分量产生的温差,从而减小现场红外测试结果误判概率。
In order to improve the accuracy of infrared test judgment of field composite insulators,infrared tests based on drone are carried out on 500 kV composite insulators of new transmission lines. The temperature curve were attained,the characteristics of temperature difference and temperature gradient were counted. The reason for the temperature difference on different parts of the normal composite insulator is discussed,and the suppressing method of the high frequency interference of the temperature curve is given. The results show that considerable proportion of normal composite insulator is with temperature difference exceeding 2 K. The temperature curve of the normal composite insulator has a high-frequency variation component,which derived from the shed-rod temperature difference and the local temperature shock from lack of infrared image clarity. Through wavelet decomposition and compensation constant correction,the temperature difference caused by the high frequency components can be effectively suppressed,reducing the probability of field infrared test misjudgment.
作者
李特
姜文东
王少华
程国开
巢亚锋
刘黎
周象贤
LI Te;JIANG Wendong;WANG Shaohua;CHENG Guokai;CHAO Yafeng;LIU Li;ZHOU Xiangxian(State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;State Grid Zhejiang Electric Power Limited Company,Hangzhou 310004,China;State Grid Ningbo Electric Power Supply Company,Ningbo 315000,China;State Grid Hunan Electric Power Research Institute,Changsha 410007,China)
出处
《电瓷避雷器》
CAS
北大核心
2020年第6期204-210,共7页
Insulators and Surge Arresters
基金
国网浙江省电力有限公司科技项目“基于无人机多光谱融合图像的架空线路复合绝缘子典型缺陷智能识别技术研究”(编号:5211DS190033)。
关键词
复合绝缘子
温度曲线
温差
高频分量
小波
干扰抑制
composite insulator
temperature curve
temperature difference
high-frequency variation component
wavelet
interference suppression