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基于电流转移的断路器弧后电流测量方法

DOI: 10.13336/j.1003-6520.hve.2015.09.047, PP. 3156-3163

Keywords: 电流转移原理,弧后电流,转移电阻,真空断路器,真空电弧,开断试验

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Abstract:

断路器的弧后电流是断路器开断性能的重要参量,为了获取高精度、低干扰的弧后电流,本文提出了一种基于真空开关、转移电阻、保护间隙和高精度电流传感器构成的弧后电流测量方法,其中真空开关负责导通大电流,在电流过零前电流转移到转移电阻上,然后利用高精度电流传感器间接测量弧后电流。建立了弧后电流装置的电流转移过程模型,分析了电流转移完成时刻和转移电流峰值受转移电阻、电流大小和真空开关刚分时刻的影响。基于仿真得到弧后电流测量装置的参数,设计了弧后电流测量装置样机,对转移电阻进行了特殊无感设计并与保护间隙实现配合保护。最后进行了10kV真空断路器在合成回路试验中的弧后电流测量,在开断5kA电流时,弧后电流峰值为500mA左右,脉宽5μ;s,弧后测量干扰小,波形平滑。对比试验结果和前人研究成果,验证了基于电流转移原理的弧后电流测量装置的可行性和准确性。

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