GIS/GIL滑动触头电连接部件过热故障机制仿真分析  

Simulation Analysis of Overheating Fault Mechanism of Electrical Connection Components Used in GIS/GIL Sliding Contact

作　　者：刘鹏[1] 谢韬 靳守锋 张鹏飞 田汇冬 彭宗仁[1] LIU Peng;XIE Tao;JIN Shoufeng;ZHANG Pengfei;TIAN Huidong;PENG Zongren(State Key Laboratory of Electrical Insulated and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;State Grid Corporation of China,Beijing 100031,China;China Electric Power Research Institute,Beijing 100192,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]国家电网有限公司,北京100031 [3]中国电力科学研究院有限公司,北京100192 [4]国网经济技术研究院有限公司,北京102209

出　　处：《高电压技术》2023年第5期2090-2100,共11页High Voltage Engineering

基　　金：国家电网公司总部科技项目(5500-202199528A-0-5-ZN)。

摘　　要：近年来,气体绝缘输电设备中滑动触头电连接部件过热故障时有发生,严重影响了设备运行的可靠性,威胁了电网的稳定运行。为了研究滑动触头过热故障发生机理,选取气体绝缘输电设备电连接用弹簧触指为研究对象,建立了电、磁、热、流、力3维多物理场耦合模型。基于静态结构分析滑动触头插接过程中和发生热膨胀后弹簧触指的接触力并依此计算接触电阻,结合接触电阻电场分析计算得出导体发热功率,并代入热-流耦合中分析滑动触头的热场分布。研究结果表明:单一环弹簧的接触力为5.06 N,与规格参数误差为1.2%;当发生偏心等故障时触指温度可达108.25℃,并间接影响相邻触指的温度和内外SF6气体的流动;文中5%的触指发生劣化过热会造成26%的触指出现升温现象,与非故障区域的最大温差为20℃;温升导致的热膨胀会使触点处接触压力呈非线性变化,长期运行或偏心受力等原因引发的接触性能劣化将直接导致触头部分出现过热故障。论文研究可为弹簧触指劣化机理研究和滑动触头电连接部件过热故障分析提供理论依据。In recent years,the overheating failure of sliding contact parts in gas-insulated transmission equipment has occurred frequently,seriously impairing the reliability of equipment operation and threatening the power grid’s stable operation.In order to study the mechanism of overheating failure of sliding contacts,spring contacts for electric connection of gas-insulated transmission equipment are selected as the research object,and a three-dimensional multi-physical field coupling model of electricity,magnetism,heat,flow,and force is established.Based on the static structure,the contact force and contact resistance of the spring contacts are calculated in the process of sliding contact insertion and after thermal expansion.Combined with the contact resistance and electric field analysis,the heating power of the conductor is calculated,and the thermal field distribution of the sliding contact is analyzed in the thermo-flow coupling.Through calculation and analysis,the contact force of a single ring spring is 5.06 N,and the error of specification parameter is 1.2%.When faults such as eccentricity occur,the temperature of the contact finger can reach 108.25℃,which indirectly affects the temperature of adjacent contact finger and the flow of internal and external SF 6 gas.In this paper,the deterioration and overheating of 5%of the contacts will cause the temperature rise of 26%of the contacts,and the maximum temperature difference is 20℃compared with the non-fault area.The thermal expansion caused by temperature rise will enable the contact pressure to change nonlinearly,and the deterioration of contact performance caused by long-term operation or eccentric force will directly lead to overheating failure of the joint.This study can provide a theoretical basis for studying the degradation mechanism of spring contacts and analyzing the overheating failure of sliding contacts.

关 键 词：GIS/GIL滑动触头 过热故障 电连接部件 弹簧触指 接触电阻 多物理场耦合 

分 类 号：TM595[电气工程—电器] TM75