35kV喷射气流灭弧防雷间隙抑制电弧的理论研究

发布时间：2018-06-22 03:31

本文选题：喷射气流灭弧防雷间隙 + 半封闭空间　；参考：《电瓷避雷器》2017年05期

【摘要】：输电线路采用多种雷电防护措施,其中效果最好、经济效益尤其高的当属新型喷射气流灭弧防雷间隙,其工作原理为:雷击发生时通过触发放置于其半封闭空间内顶端的灭弧能量包爆炸产生高压、高速的气流,在极短时间内完全熄灭电弧,且不发生重燃。从动量守恒和能量平衡两个方面来讨论气流与电弧的耦合情况,考虑在理想状态下,灭弧能量包爆炸产生的动量全部转化为气流作用于电弧上的冲量,足以在瞬间破坏电弧维持平衡所需的条件,使得电弧在极短时间内被熄灭。进行35kV电压等级下喷射气流灭弧防雷间隙熄灭电弧的有效性实验,并且记录实验过程,得出在3 ms内熄灭电弧的结论。采用Fluent软件对气流与电弧的耦合过程进行仿真分析,并通过实验结果与仿真结果进行对比,验证了喷射气流灭弧防雷间隙灭弧的有效性。
[Abstract]:The transmission line adopts a variety of lightning protection measures, among which the best effect and especially high economic benefit are the new type of jet air arc extinguishing lightning gap. The working principle is that when lightning strike occurs, the arc is completely extinguished in a very short time by triggering the explosion of the arc-extinguishing energy package placed at the top of the semi-enclosed space, producing high pressure and high speed airflow, and no reburning occurs in a very short period of time. The coupling of gas flow and arc is discussed in terms of momentum conservation and energy balance. In ideal condition, the momentum generated by explosion of arc extinguishing energy package is transformed into impulse acting on arc by airflow. The conditions necessary to maintain the equilibrium of the arc in an instant, so that the arc is extinguished in a very short period of time. The effectiveness experiment of extinguishing lightning gap of jet flow at 35 kV voltage level is carried out, and the experimental process is recorded, and the conclusion of extinguishing arc within 3 Ms is obtained. The coupling process between air flow and arc is simulated and analyzed by fluent software, and the effectiveness of jet air arc extinguishing and lightning gap arc extinguishing is verified by comparing the experimental results with the simulation results.
【作者单位】：广西大学电气工程学院;
【基金】：国家自然科学基金资助项目(编号:51467002)
【分类号】：TM863

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