摘要
自由金属颗粒缺陷是GIS中常见的绝缘缺陷,而且不同严重程度的局部放电对设备安全运行的影响不同,因此有必要对该类缺陷的放电发展程度进行研究。采用阶梯升压法对自由金属颗粒局部放电进行研究,利用特高频检测技术对局部放电信号进行采集,并提取出6个有效表征局部放电严重程度的特征参量,最后采用K-means聚类算法及最小距离原则建立了局部放电发展阶段的划分规则,并探讨了自由金属颗粒缺陷放电发展过程的演化机制。结果表明:放电特征参量随试验时间的增加均呈现出单调突变式增大或减小的趋势,可以用来表征自由金属颗粒放电的严重程度,通过聚类分析算法和局部放电试验将金属颗粒的放电过程划分为放电发展阶段与放电的临近击穿阶段。
Free metal particle defect is a common insulation defect in GIS. Different severity of partial discharge have different influence on the safe operation of equipment. Therefore it is necessary to study the discharge development of this kind of defect. The partial discharge of free metal particles was studied by the step up method. The partial discharge data was collected by ultra high frequency detection technology, and six characteristic parameters which can characterize the severity of partial discharge effectively were extracted. At last, the division rule of partial discharge development stage was constructed by K-means clustering algorithm and minimum distance principle, and the evolution mechanism of discharge development process of free metal particle defect was discussed. The results show that with the increase of test time, the characteristic parameters of discharge increase or decrease monotonically, which can be used to characterize the discharge severity of free metal particle, and the discharge process of metal particles is divided into discharge development stage and discharge near breakdown stage by cluster analysis algorithm and partial discharge test.
作者
何宁辉
沙伟燕
李秀广
张佩
亓亮
赵晨昊
唐志国
HE Ninghui;SHA Weiyan;LI Xiuguang;ZHANG Pei;QI Liang;ZHAO Chenhao;TANG Zhiguo(Ningxia Electrical Powder Research Institute of State Grid,Tinchuan 750011,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)
出处
《绝缘材料》
CAS
北大核心
2019年第12期80-88,共9页
Insulating Materials
基金
宁夏自然科学基金资助项目(2018AAC03222)
关键词
GIS
自由金属颗粒放电
发展特性
变化规律
GIS
free metal particle discharge
development characteristics
change law
