126kV真空断路器分离磁路式永磁操动机构

发布时间：2018-03-12 10:54

本文选题：数值仿真　切入点：永磁机构　出处：《电工技术学报》2015年20期 　论文类型：期刊论文

【摘要】：永磁操动机构因其结构简单、可靠性高、操作寿命长、动作分散性小以及与真空断路器配合良好等特点被广泛应用于中低压等级(3.6~40.5k V)的真空断路器中。但由于高电压等级真空断路器触头的运动行程长、分合闸速度高,依靠传统结构形式的永磁机构难适应输电等级(72k V)真空断路器高速度要求。因此,本文提出一种适用于126k V真空断路器的新型双稳态轴对称分离磁路永磁机构,将永磁保持部分与电磁操动部分分离,减少两部分磁路在工作时的干扰,进而提高永磁机构的分、合闸速度。同时引入非工作气隙的设计,当保持动铁心离开分合闸位置时永磁力急剧下降,减少了永磁铁在运动过程中对机构运动特性的影响。本文采用有限元软件与多体动力学软件耦合仿真方法对该机构的静态特性及动态特性进行了计算,并根据计算结果制作了样机。样机的实验结果证明该新型永磁机构的速度特性可满足126k V真空断路器的要求,实验结果与仿真结果具有较好的一致性。
[Abstract]:The permanent magnet actuator has the advantages of simple structure, high reliability and long operating life. It is widely used in vacuum circuit breakers with medium and low voltage grade (3.6V) 40.5kV. However, because of the long movement stroke of the contacts of the high voltage grade vacuum circuit breakers, the opening and closing speed is high. It is difficult to adapt to the high speed requirement of vacuum circuit breaker based on the traditional structure of permanent magnet mechanism. Therefore, a new bistable axisymmetric magnetic circuit separation permanent magnetic mechanism suitable for 126kV vacuum circuit breaker is proposed in this paper. The permanent magnet holding part is separated from the electromagnetic operating part, which reduces the interference of the two parts of the magnetic circuit in operation, and then improves the opening and closing speed of the permanent magnet mechanism. At the same time, the design of the non-working air gap is introduced. When the moving iron core is kept away from the closing position, the permanent magnetic force drops sharply. The effect of permanent magnet on the kinematic characteristics of the mechanism is reduced. In this paper, the static and dynamic characteristics of the mechanism are calculated by using the coupling simulation method of finite element software and multi-body dynamics software. The experimental results show that the speed characteristics of the new permanent magnet mechanism can meet the requirements of 126kV vacuum circuit breaker, and the experimental results are in good agreement with the simulation results.
【作者单位】：电力设备电气绝缘国家重点实验室(西安交通大学);
【基金】：国家自然科学基金(51377127) 电力设备电气绝缘国家重点实验室(EIPE14311) 中国博士后科学基金(2013M542350)资助项目
【分类号】：TM561.2

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