摘要
针对一起禁飞区500 kV复合绝缘子断裂导致导线掉线事故,依据现行标准对故障绝缘子开展了外观检测、材料性能试验和电气试验。综合现场事故调查情况和检测分析结果发现,由于复合绝缘子芯棒玻璃纤维与硅橡胶护套界面存在缺陷,在挂网运行多年后绝缘子芯棒老化,加之受运行环境综合影响,加剧了芯棒内部纤维化和整体结构变性,最终导致绝缘子酥朽断裂,进而发生导线脱串掉线事故。最后,给出无人机禁飞区、弱信号等区段线路复合绝缘子的运维策略及防范措施,以避免此类事故再次发生,确保电网安全稳定运行。
In order to study the cause of wire falling accident caused by fracture of 500 kV composite insulator in the no-fly zone of a province,various inspections and tests were carried out on the accident insulator string according to the current standard.The results of comprehensive detection and analysis and on-site fault investigation show that due to the defects in the interface between the glass fiber and the silicone rubber sheath of the composite insulator rod,the rod of the insulator is aged after many years of operation.In addition,due to the comprehensive influence of the operating environment,the internal fibrosis and overall structural degeneration of the rod are aggravated,which eventually causes the insulator to break down and cause the wire to fall off.Finally,in order to avoid the recurrence of such accidents and ensure the safe and stable operation of the power grid,the operation and maintenance strategy of composite insulators is given for the lines under the jurisdiction of the UAV no-fly zone and weak signal zone.
作者
李勃铖
李稳
张稷
邓园
黄浩
刘钢
雷添
LI Bocheng;LI Wen;ZHANG Ji;DENG Yuan;HUANG Hao;LIU Gang;LEI Tian(Live Inspection and Intelligent Operation Technology State Grid Corporation Laboratory(State Grid Hunan Extra High Voltage Transmission Company),Hengyang,Hunan 421001,China;Key Laboratory of Intelligent Live Working Technology and Equipment(Robot)of Hunan Province,Hengyang,Hunan 421001,China)
出处
《浙江电力》
2023年第9期117-123,共7页
Zhejiang Electric Power
基金
国网湖南省电力有限公司科技项目(5216AJ22000B)。
