Low- Voltage Arc Interruption Computation: the Effect of Stefan Flow
Low- Voltage Arc Interruption Computation: the Effect of Stefan Flow
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DOI：
10.1109/ceidp.2018.8544897
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
Jindong Huo;S. Selezneva;L. Jacobs;Yang Cao
中科院分区：
文献类型：
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作者：
Jindong Huo;S. Selezneva;L. Jacobs;Yang Cao
低压断路器通过利用阴极压降强制电流归零，为工业和住宅配电提供必要的保护。这是通过在触头打开时使用电弧上的磁力和压力来实现的，以将电弧推向一堆钢板，这将电弧分成子电弧，从而增加阴极液滴的数量。由于故障电流可能很高，大量的能量可能被耗散，这导致电弧和固体材料之间的相互作用：壁材料的烧蚀。虽然电弧运行和分裂的CFD/MHD研究已经进行了全面的研究，但在电弧断开计算中的一个重要机制，即物种生成引起的Stefan流的影响尚未被考虑。在这项工作中，我们报告了一个模拟方法，考虑到斯特凡流的影响，特别是对于破碎机与高度气化壁材料。该方法考虑了从聚合物壁面和电极表面引入的物质的初始速度，这将对等离子体混合物的流场和性质产生很大的影响。考虑Stefan流效应的计算能力将进一步提高低压断路器电弧仿真的准确性。
Low-voltage circuit breakers provide essential protection for industrial and residential power distribution, by taking advantage of cathode drop to force current zero. This is accomplished by using the magnetic force and pressure on the arc as the contacts open to push the arc towards a stack of steel plates which break the arc into sub-arcs and thereby multiply the number of cathode drops. As the fault current can be high, substantial energy can be dissipated, which results in interactions among the arc and solid materials: ablation of wall materials. Comprehensive CFD/MHD studies have been conducted for arc running and splitting, although an important mechanism in arc breaking computation, the effect of Stefan flow induced by species generation, has not been considered. In this work, we report out a simulation approach for taking into account the effect of Stefan flow, particularly for the breakers with highly gasified wall materials. This approach accounts for the initial velocity of added-in species from the surface of the polymer wall and electrodes' surface, which will largely influence the flow field and the property of plasma mixture. The ability of conducting computation with considering Stefan flow effect will further enhances the accuracy of arc simulation in low-voltage circuit breakers.