35 kV绝缘管型母线运行异常分析及结构探讨  

Analysis on Abnormal Operation and Structure of a 35 kV Insulating Tubular Bus Bar

作　　者：张星海[1] 刘凤莲[1] 邓元实[1] 丁登伟[1] 马啟潇[1] 范松海[1] 

机构地区：[1]国网四川省电力公司电力科学研究院,成都610072

出　　处：《高压电器》2016年第1期190-197,203,共9页High Voltage Apparatus

摘　　要：近年来,绝缘管型母线作为一种大电流连接线使用日渐增多,但由于目前管母的生产、运维尚缺乏有效规范,投运后频繁出现问题。文中以四川某变电站35 k V绝缘管母为研究对象,对其投运后出现的鼓包、冒烟、着火等异常现象和结构设计进行了全面的分析与探讨。通过多组试验和解体分析结果,管母的半导电层和铜带配合不合理所导致的半导电层破损是运行异常的直接原因。有限元仿真计算结果表明,半导电层出现破损后,破损处电场局部集中,且破损处的电场强度与破损口大小正向相关。同时,由于半导电层阻燃性能较差,出现放电后使缺陷发展扩大,并最终表现出鼓包、冒烟、着火等异常现象。在此基础上,文中还分析了管母的结构设计、材料使用对其电气性能的影响,并从生产加工、运行维护、检测等方面对管母的安全可靠运行提出建议。Insulating tubular bus bars have been widely used as connecting lines in recent years. However, faults occur frequently in their service due to lack of effective regulation. In this study, a 35 kV insulating tubular bus bar in a substation was analyzed in terms of the structure design and the abnormal behaviours. Disassembly inspection and tests were conducted, and the results indicate that the abnormal operation of the bus bar is caused by mismatch of the semi-conductive layer and the folded copper strip. Simulation shows that the electric field concentrate sat the position where semi-conductive layer is worn off by the folded copper strip, and there is a positive correlation between the electric field at the worn position and the size of the position. Further, as the semi-conductive layer is weak in electric strength and flame resistance, this defect develops quickly to induce bulging, smoking and burning in the existence of partial discharge. In addition, structure design and materials of the bus bar, as well as their effects on electrical properties of the bus bar, are also discussed, and some suggestions on safe operation of the bus bar are given with respect to production, operation, and detection.

关 键 词：绝缘管母 半导电层 电场分布 运行异常 

分 类 号：TM645.11[电气工程—电力系统及自动化]