快速断路器液压机构用双冗余斥力脱扣装置设计  

Design of Dual Redundant Repulsion Mechanism for Hydraulic Mechanism of Fast Circuit Breakers

作　　者：尹升 李志兵 田宇 冯玺宇 王永兴[1] 董恩源[1] Yin Sheng;Li Zhibing;Tian Yu;Feng Xiyu;Wang Yongxing;Dong Enyuan(School of Electrical Engineering Dalian University of Technology,Dalian 116024,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]大连理工大学电气工程学院,大连116024 [2]中国电力科学研究院有限公司,北京100192

出　　处：《电工技术学报》2025年第2期598-609,共12页Transactions of China Electrotechnical Society

基　　金：国家电网公司总部科技资助项目(5108-202218280A-2-339-XG)。

摘　　要：柔性低频交流输电是输送20 Hz的全新交流输电技术,可有效提升输送的容量、距离及效率,解决海上风电远距离输送、电网安全互联等难题。由于其频率较低,断路器切除短路故障时存在燃弧时间长、能量大等问题,需要结合选相分闸的技术方案。220 kV及以上电压等级的快速断路器常采用双重化继保装置,采用双脱扣方式,其动作时间与单脱扣存在一定的时间差,影响选相分闸的准确性。针对上述问题,该文设计了一种带去磁线圈的双冗余斥力机构,对斥力机构的磁场、机械特性及动作时间差开展了研究。基于磁场的耦合关系提出了采用去磁线圈减小动作时间差的方法,并设计了双冗余斥力机构;建立其数学模型,推导了去磁线圈与斥力线圈间的磁场耦合关系;分析了电容电压、电容容量及去磁线圈匝数等参数对动作时间差的多因素耦合影响规律,获得了最佳设计参数。仿真结果表明,去磁线圈的设计能够有效地减小快速断路器动作时间差。进行了样机制作,实验验证了其可行性,为提升快速断路器选相分闸准确性提供保障。Flexible low-frequency transmission is a new AC transmission technology that transmits 20 Hz.It can reduce reactance,increase transmission power and distance,and solve the long-distance,large-capacity transmission problem of offshore wind power.Flexible low-frequency transmission is a supplement to power frequency AC and DC transmission,which can also be applied to power grid security interconnection,multi-island interconnection,cable-based urban power supply,and other scenarios.Conventional SF6 circuit breaker trips using ordinary solenoid valve with a tripping time of about 11~14 ms,existing action delay.Fast SF6 circuit breaker controls valve spool through the electromagnetic repulsion force to drive the fast action,greatly reducing the action time to less than 2 ms.It can alleviate the problems of long arcing time and considerable energy needed to break the arc,which improves the circuit breaker’s breaking capacity.Combined with the fast circuit breaker and the phase-selecting opening technology,accurately predicting the zero-crossing point of the short-circuit fault current effectively reduces the arcing time and successfully breaks in the short arcing time.In addition,the influence of the current frequency on the breaking time of the short-circuit fault is reduced.The fast circuit breaker of 220 kV and above voltage level often adopts a double relay protection device and double tripping mode.A time difference between its action time and single tripping affects the accuracy of phase selection and opening.Based on the coupling relationship of the magnetic field,this paper proposes a method to reduce the action time difference using a demagnetization coil and designs a double redundant repulsion mechanism.The opening process involves multi-physical field coupling,such as magnetic field coupling,eddy current loss,loop discharge,and mechanical motion.The physical quantities(magnetic induction intensity,electromagnetic field energy,electromagnetic force,and inductance)are derived by calculating the electromotiv

关 键 词：快速断路器 电磁斥力机构 斥力脱扣液压机构 去磁线圈 

分 类 号：TM561[电气工程—电器]