Abstract：Vacuum circuit breakers (VCBs) are extending their applications from medium voltage level of 3.6~40.5kV to transmission voltage level(>72kV). Moreover, permanent magnetic actuators (PMAs) have been widely used in medium voltage VCBs due to their high reliability and controllability. However, a conventional bi-stable PMA cannot be adopted in transmission voltage level such as 126kV VCBs directly because of its low velocity characteristic. The objective of this paper is to propose a multi-magnetic circuit PMA to satisfy the high velocity requirements for 126kV VCBs. The proposed PMA offers a bi-stable structure, including holding component and driving component whose magnetic circuits are separated. Air gaps are specifically designed in the magnetic circuits in order to improve the velocity performance of the proposed PMA. Both static and dynamic characteristics of the proposed PMA model have been calculated by a finite element software coupled to a multi-body dynamics software. Furthermore, a prototype of separated magnetic circuit PMA has been developed according to the simulation results. Experimental results on the prototype have shown the velocity characteristics of the proposed PMA are able to meet the operation requirements of a 126kV VCB and agree well with the simulation results.
孙丽琼,王振兴,何塞楠,马立超,耿英三,刘志远. 126kV真空断路器分离磁路式永磁操动机构[J]. 电工技术学报, 2015, 30(20): 49-56.
Sun Liqiong, Wang Zhenxing, He Sainan, Ma Lichao, Geng Yingsan, Liu Zhiyuan. A Permanent Magnetic Actuator with Separated Magnetic Circuit for 126kV Vacuum Circuit Breakers. Transactions of China Electrotechnical Society, 2015, 30(20): 49-56.
[1] Slade P G. The vacuum interrupter: theory, design, and application[M]. London: CRC, 2008. [2] Yanabu S, Zaima E, Hasegawa T. Historical review of high voltage switchgear developments in the 20th century for power transmission and distribution system in Japan[J]. IEEE Transactions on Power Delivery, 2006, 21(2): 659-664. [3] Liu Z Y, Wang J M, Xiu S X, et al. Development of high-voltage vacuum circuit breakers in China[J]. IEEE Transactions on Plasma Science, 2007, 35(4): 856-865. [4] Kong G W, Liu Z Y, Wang D, et al. High-current vacuum arc: the relationship between anode phenomena and the average opening velocity of vacuum interrupter [J]. IEEE Transactions on Plasma Science, 2011, 39(6): 1370-1378. [5] Sun L Q, Yu L, Liu Z Y, et al. An opening displacement curve characteristic determined by high-current anode phenomena of a vacuum interrupter[J]. IEEE Trans- actions on Power Delivery, 2013, 28(4): 2585-2593. [6] Lequesne B. Fast-acting long-stroke bistable solenoids with moving permanent magnets[J]. IEEE Transactions on Industry Applications, 1990, 26(5): 848-856. [7] Ro J S, Hong S K, Jung H K. Characteristic analysis and design of a novel permanent magnetic actuator for a vacuum circuit breaker[J]. IET Electric Power Appli- cations, 2013, 7(2): 87-96. [8] Cai Z Y, Ma S H, Wang J M. An approach of improve permanent magnetic actuator of vacuum circuit breaker[C]. International Symposium on Discharges and Electrical Insulation in Vacuum, 2008, 1: 165- 168. [9] Kang J H, Kwak S Y, Kim R E, et al. The optimal design and dynamic characteristics analysis of electric actuator (EMFA) for 170kV/50kA VCB based on three- link structure[C]. International Symposium on Disch- arges and Electrical Insulation in Vacuum, 2008, 1: 177-180. [10] Wang Z X, Yan P, Geng Y S, et al. Simulation of an improved operating method for vacuum circuit breakers with permanent magnetic actuators[J]. International Journal of Applied Electromagnetics and Mechanics, 2010, 33(3-4): 1373-1381.
2015, Vol. 30 
