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| A Permanent Magnetic Actuator with Separated Magnetic Circuit for 126kV Vacuum Circuit Breakers |
| Sun Liqiong, Wang Zhenxing, He Sainan, Ma Lichao, Geng Yingsan, Liu Zhiyuan |
| State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China |
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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.
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Received: 28 December 2013
Published: 30 October 2015
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2015, Vol. 30 
