±500kV直流复合套管雨闪事故分析及预防措施研究  

Analysis and Prevention Treatment for Rain Flashover Accident of ±500 kV Composite Bushing

作　　者：沈煜[1,2] 邓万婷[1,2] 张耀东[1,2] 全江涛[1,2] 

机构地区：[1]国网湖北省电力公司电力科学研究院,武汉430077 [2]国家电网公司电气设备现场试验技术重点实验室,武汉430077

出　　处：《电瓷避雷器》2015年第6期16-21,共6页Insulators and Surge Arresters

摘　　要：雨闪在我国直流外绝缘事故中所占比重十分突出。分析了一起±500 kV直流复合套管雨闪事故,通过对事故原因进行剖析,找出了直流套管外绝缘设计存在的不足,从优化外绝缘设计和加装辅助伞裙等方面提出了预防雨闪措施。针对在复合硅橡胶外绝缘基础上加装辅助伞裙实例较少的情况,对辅助伞裙设计及安装技术进行了研究,介绍了新的螺旋辅助伞裙结构设计、材料性能、模拟试验、安装方法和工艺,为高压直流输电系统的直流设备外绝缘设计和防雨闪技术提供了借鉴经验。Rain flashover is a large proportion of external transmission. A rain flashover accident of ±500kV composite bushing insulation accidents in HVDC is analyzed. After analyzing the accident causes, the existing shortcomings in external insulation design of DC bushing are found out. The corresponding method for improvement and treatment are proposed by aspect of optimizing external insulation design and using booster shed. Design and installation technology for booster shed is researched in the light of lacking of examples of installing booster sheds on composite silicone insulation. Structure design, material performance, simulation experiment, installation process of new spiral booster shed are introduced, which provide the experiences to external insulation design and anti- rain flashover technology of DC devices for the future HVDC transmission system.

关 键 词：直流输电 复合套管 雨闪 辅助伞裙 

分 类 号：TM216.5[一般工业技术—材料科学与工程] TM721.1[电气工程—电工理论与新技术]