磁收缩效应型液态金属限流器起弧特性研究  

Study of the Arc Ignition Characteristics of Liquid Metal Current Limiter Based on Magnetic Pinch Effect

作　　者：何海龙[1] 吴翊[1] 刘炜 纽春萍[1] 荣命哲[1] 杨倬[1] 易强[1] 郭安祥 

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049 [2]陕西省地方电力设计研究院,陕西省西安市710065 [3]国网陕西省电力公司电力科学研究院,陕西省西安市710199

出　　处：《中国电机工程学报》2017年第4期1053-1061,共9页Proceedings of the CSEE

基　　金：国家973专题项目(2015CB251005);自然科学基金资助项目(51521065;51577145;51377128);电力设备电气绝缘国家重点实验室资助(EIPE16312);国家电网公司科技项目(SGSNKYOOKJJS1501564);国网湖北省电力公司科技项目(直流电网故障限流技术研究)(SGRIZLKJ(2016)325)~~

摘　　要：基于磁收缩效应的液态金属限流器具有体积小、结构简单、自检测故障和自恢复的优点,在未来中低压系统中具有良好的应用前景。采用高速摄影技术对液态金属收缩动态过程进行观测,并对其弧前时间进行测量,通过所建立的仿真模型对该物理过程进行分析研究。采用以上方法对不同因素下的液态金属起弧特性进行了全面研究,包括初始自由液面高度、隔板通孔孔壁粗糙程度及预期电流上升率等关键因素。研究结果表明:液态金属磁收缩过程往往同时包括源于液面凹陷的收缩及通孔液柱直接收缩两个过程。通过研究获得了两个过程的规律及影响,为未来限流器结构设计与性能优化提供依据。The liquid metal current limiter（LMCL） based on magnetic pinch effect has a good application prospect in the future LV and MV power system with its merits of small volume, simple structure, self-activation and self-healing in case of a fault. The high-speed camera was adopted to observe the dynamic pinch process of liquid metal. Then its pre-arcing time was measured. In addition, this physical process was also studied and analyzed by simulation. The arc ignition characteristics of liquid metal were fully investigated with the three aforementioned methods on account of different factors. They are the initial height of the liquid＇s free surface, roughness of the spacer＇s channel and the increasing rate of prospective current. The results demonstrate that the pinch process of liquid metal always includes two processes, i.e. the pinch process from its free surface and the direct pinch process of the liquid column in the channel. Their effects and influences for each was obtained, which can act as the basis for structural design and performance optimization for future LMCLs.

关 键 词：液态金属限流器 起弧特性 磁收缩效应 自由液面 弧前时间 

分 类 号：TM562[电气工程—电器]