在役瓷绝缘子串温度梯度分布相关性分析  

Correlation analysis of temperature gradients distribution of porcelain insulator stringsin service

作　　者：胡丹晖 周学明 易福明 陈钊 陆倚鹏 朱向前[4] 尹骏刚 HU Danhui;ZHOU Xueming;YI Fuming;CHEN Zhao;LU Yipeng;ZHU Xiangqian;YIN Jungang(Electric Power Science Research Institute,State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China;Hunan HDHL Electric & Information Technology Co., Ltd.,Changsha 410285, China;Zhumadian Power Supply Company,State Grid Henan Electric Power Co., Ltd., Zhumadian 467000, China;College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

机构地区：[1]国网湖北省电力有限公司电力科学研究院,湖北武汉430077 [2]湖南湖大华龙电气与信息技术有限公司,湖南长沙410082 [3]国网河南省电力公司驻马店供电公司,河南驻马店467000 [4]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电力科学与技术学报》2021年第2期172-179,共8页Journal of Electric Power Science And Technology

基　　金：国家电网有限公司总部科技指南项目(52153219000F)。

摘　　要：在绝缘子现场红外检测中,零值绝缘子铁帽温差往往达不到相关标准所规定的阈值,易造成漏判。为进一步提高瓷绝缘子红外测零技术的准确率,提出一种结合铁帽温差阈值法和温度梯度相关系数法的双判据零值检测方法,并开展变电站内盘形悬式绝缘子红外检测对照试验。试验结果表明:在适宜的检测环境条件下,当铁帽温差阈值法检测结果出现模糊度时,通过研究温度梯度分布相关系数分散特性,可以进一步确认零值是否发生,减少零值漏检概率;在不适宜的检测环境条件下,温差阈值法检测结果的模糊度增加,温度梯度相关系数分散性增大,正常绝缘子串和含零值绝缘子串温度梯度相关系数区分度也随之下降。In the process of porcelain insulator infrared detection,the missing judgment may happen due to the temperature difference of a zero value insulator failing to reach the threshold specified by the relevant standards.In order to improve the accuracy of the infrared detection,this article proposes a new method combining the iron cap temperature difference threshold method and the temperature gradient correlation coefficient method.Infrared detection field experiment of disc suspension insulators in substation is conducted.The test results show that under the suitable environment conditions,the zero value insulator can be confirmed by studying the dispersion characteristics of temperature gradient distribution correlation coefficients,while the result of difference threshold method for iron cap temperature is unstable.Thus,the missing judgment probability can be decreased.By contrast,under the unsuitable environment conditions,the dispersion of the temperature gradient correlation coefficient increases with the increase of the ambiguity for the temperature difference threshold method.Reduction occurs on the discrimination degree of the temperature gradient correlation coefficient between the normal insulator string and the zero value insulator string.

关 键 词：瓷绝缘子 红外检测 温度梯度分布 相关系数 

分 类 号：TM85[电气工程—高电压与绝缘技术]