Theoretical and Experimental Work on Optimal Contact Geometries on Fast Mechanical Disconnect Switches
Theoretical and Experimental Work on Optimal Contact Geometries on Fast Mechanical Disconnect Switches
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DOI：
10.1109/holm.2018.8611645
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发表时间：
2018-10
期刊：
影响因子：
--
通讯作者：
T. Damle;L. Graber
中科院分区：
文献类型：
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作者：
T. Damle;L. Graber
快速机械隔离开关(FMS)是混合式断路器的重要组成部分，是中压配电系统故障排除的保护装置。所提出的FMS是一个由放大的压电式致动器操作的真空开关。这样的致动器能够在不到1毫秒的时间内实现前所未有的速度和触点分离。此类设计的局限性在于，打开位置的接触间隔通常小于1毫米，关闭位置的接触力较低，约为100 N。这需要触点的新设计才能在这样的约束下工作。触点的几何形状必须仔细设计，以便在闭合时将电阻降至最低，并在断开时将电场增强降至最低。本文给出了有限元分析和实验结果，目的是确定FMS最合适的接触几何形式。实验表明，优化后的接触几何比初始的球面几何阻力小40%。
Fast mechanical disconnect switches (FMS) are an integral part of hybrid circuit breakers, which are proposed as protection devices to clear faults in medium voltage distribution systems. The proposed FMS is a vacuum switch that is operated by an amplified piezoelectric actuator. Such actuators enable unprecedented speed and contact separation in less than one millisecond. The limitations that come with such designs are the low contact separation of typically less than one millimeter in open position and low contact force in the order of 100 N in closed position. This requires a new design of the contacts to operate under such constraints. The geometry of the contacts must be carefully designed to minimize electrical resistance when closed and minimize electric field enhancement when open. The paper presents finite element analysis and experimental results with the aim of identifying the most suitable contact geometry for FMS. The experiments show that optimized contact geometries have up to 40% less resistance than the initial spherical geometry.