燃弧时间对混合型直流真空断路器分断特性的影响

发布时间：2017-12-31 04:39

本文关键词：燃弧时间对混合型直流真空断路器分断特性的影响　出处：《电工技术学报》2015年24期 　论文类型：期刊论文

【摘要】：利用可拆卸真空灭弧室,研究了直径45mm的Cu Cr50平板触头,在不同的燃弧时间下采用强迫换流法分断2~5k A直流的特性,通过高速摄像机对分断过程进行了拍摄。实验结果表明,分断引燃电弧的过程存在单弧柱和双弧柱两种情况。燃弧时间小于2ms,换流电流投入时,电弧有一定程度扩散但依旧为桥柱形状态。单弧柱情况燃弧面积小于电极表面,过电压作用下的重燃点多为原电弧引燃处;双弧柱情况电弧分布占据电极的面积增加,分断性能提高。燃弧时间大于2.5ms,换流电流投入时触头间隙中电弧已完全扩散且相对均匀,重燃点随机分布。结合前人对不同触头结构下电弧形态演化规律的认识,讨论得出横磁型触头结构适于直流分断的结论。
[Abstract]:Using a detachable vacuum interrupter, the characteristics of a 45mm diameter Cu Cr50 flat contact are studied, and the characteristics of breaking 2kA DC at different arc burning times by forced commutation method are studied. The breaking process was photographed by high-speed camera. The experimental results show that there are two situations in the process of breaking and igniting arc: single arc column and double arc column. The arc burning time is less than 2 Ms and the commutation current is in operation. The arc diffuses to a certain extent but is still bridge column. The arc area of single arc column is smaller than that of the electrode surface, and the heavy ignition point under the action of overvoltage is mostly the original arc ignition place. In the case of double arc column, the arc distribution occupies the area of the electrode and the breaking performance is improved. The arc burning time is more than 2.5 Ms, and the arc in the contact gap is completely diffused and relatively uniform when the commutation current is in place. The random distribution of heavy ignition points and the conclusion that the transverse magnetic contact structure is suitable for DC breakage is discussed based on the previous understanding of the evolution law of arc shape under different contact structures.
【作者单位】：海军工程大学舰船缩电力技术国防科技重点实验室;海军工程大学电气工程学院;
【基金】：国家重点基础研究发展计划(973计划)(2012CB215103) 国家自然科学基金(51207166、51377166和51307179)资助项目
【分类号】：TM561.2
【正文快照】： 0引言基于强迫换流原理的混合型直流真空断路器的通流能力强、限流效果好且分断能力高,成为了直流开断技术的重要发展方向[1-3]。混合型直流真空断路器通常由高速真空开关并联换流电路及限压吸能组件组成,通过在真空开关上制造电流过零点迫使电弧熄灭,达到开断电路的目的[4,5]

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