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高压电器  2015 

永磁机构真空断路器分闸触头过冲与反弹抑制方法的研究

, PP. 22-27

Keywords: 永磁机构,过冲与反弹,线圈电流,DSP,分断能力

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Abstract:

为了抑制真空断路器分闸操作过程的触头过冲与反弹现象,提高断路器的开断性能,笔者基于真空断路器永磁机构分闸操作工作原理,分析触头的运动过程,获取有效抑制触头过冲与反弹的预设行程值,建立了触头在分闸位置的速度特性与过冲及反弹幅值的特征关系。利用闭环控制策略对永磁机构线圈电流进行调节,降低触头的分闸末速度,实现对触头过冲与反弹的有效抑制。研制以数字信号处理器(DSP)为核心的控制装置,开展12kV真空断路器永磁机构分闸操作实验,对操作过程中触头行程数据进行对比分析。结果表明,在上述控制系统的作用下,触头的运动过程处于受控状态,通过对预设行程值的标定,实现有效抑制触头过冲与反弹,保证永磁机构分闸操作可靠性,提高断路器分断能力。

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