摘要
为减少覆冰导致的输电线路绝缘子融冰闪络事故,对110kV输电线路覆冰复合绝缘子进行了融冰闪络试验研究。用紫外(UV)成像仪监测其融冰过程中的放电现象,并与泄漏电流在线监测装置记录的试验过程中的泄漏电流进行对比,发现融冰闪络过程中的泄漏电流与紫外图像存在对应关系。用紫外光子数作为检测绝缘子放电的特征量,提出了覆冰绝缘子放电过程紫外预警3区段法,即安全区、预警区及危险区。给出了110kV输电线路复合绝缘子融冰闪络预警方法及判据:当监测距离为6.5m时,若高压端有间歇性光子数突变现象,则视为进入预警区,在不同的增益情况下,根据放电情况判断是否给出预警。
To reduce the possibility of ice-melting flashover on transmission lines,we experimentally study the ice-melting flashover of ice-covered composite insulators on 110 kV transmission lines.The discharging phenomenon is observed by using utlraviolet（UV） imaging technology,and is compared with the leakage current during the test gained by the online monitoring devices.The results show that the leakage current and the UV image have a periodical corresponding relation during the icing flashover.The number of UV photons is regarded as the characteristic quantity to detect discharging,and the three-segment method of UV warning for the discharging process of ice-covered insulators is put forward.The method and criterion about flashover pre-warning of composite insulators on 110 kV transmission lines are given.When the monitoring distance is 6.5 m,it is considered to enter the warning zone if the high-potential side has a sudden change in the number of the intermittent photon,and a warning would be given or not according to the discharge situation under the different gains.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2012年第10期2589-2595,共7页
High Voltage Engineering
基金
教育部博士点基金(20090141110053)~~
关键词
紫外成像技术
覆冰绝缘子
融冰闪络
紫外光子数
泄漏电流
闪络预警
紫外预警3区段法
ultraviolet（UV） imaging technology
ice-covered insulators
ice-melting flashover
number of UV photons
leakage current
flashover pre-warning
three-segment method of UV warning
