常德电网变电设备导电回路过热缺陷原因及对策分析  

Analysis on Overheat of Conductive Circuit of Transformer Equipment in Changde Power Grid with Countermeasures

作　　者：帅勇[1] 胡峰[1] 朱悌峰[1] 

机构地区：[1]湖南省电力公司常德电业局,湖南常德415000

出　　处：《高压电器》2014年第5期120-125,共6页High Voltage Apparatus

摘　　要：通过对常德电网年度变电设备运行过程中出现的设备导电回路过热缺陷进行分类归纳分析与总结,发现电网中变电设备过热缺陷的分布与特点。以电接触理论中接触电阻的经典理论为基础,综合考虑设备端子设计、母排及变电设备安装技术标准的要求,对设备发热的原因进行了深入的分析,并结合运维检修的经验和标准规范的要求针对性的制定了例如针对螺杆接触改为螺纹抱箍型接线板、铜铝对接接触使用复合铜铝过渡片、螺钉紧固接触静触头环改为抱箍型接触、例行状态检修开展回路电阻测试、触指(头)镀银层现场电刷镀修复技术、采用力矩扳手进行紧固验收等一系列可行的防范措施,对今后的变电设备运维检修管理及现场工作均具有一定的参考价值。The overheat faults of the transformer equipment conductive circuit in Changde Power Grid are analyzed comprehensively to understand the distribution and features of the faults. According to the classical contact resistance theory in the electrical contact theory,the cause of the overheat equipment is analyzed by considering the terminal design,the bus-bar,and the installation specification of the transformer equipment. On the basis of the experience about operation and maintenance as well as the corresponding specifications,some precautionary measures are offered to the management of substation equipment maintenance and repair, such as replacing the screw contact by screw-hoop type wiring board,adopting composite copper/aluminum transition piece for the copper and aluminum butt contact,replacing the static contact ring of the screw-fastened joint by hoop-type contact,conducting loop resistance test in routine condition-based maintenance,performing on-site electric plating of finger（head）silver layer,and using a torque wrench for tightening acceptance.

关 键 词：变电设备 常德电网 接触电阻 电流致热型缺陷 反过热事故措施 状态检修 电刷镀银 

分 类 号：TM73[电气工程—电力系统及自动化]