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A Three Dimensional CFD analysis to investigate the effect of ablative materials and venting arrangement on arc characteristics in low voltage circuit breakers

机译:三维CFD分析,研究了烧蚀材料的效果,对低压断路器电弧特性的影响

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When a low voltage circuit breaker interrupts a fault current, arc plasma is established between the contacts of the breaker. This paper focuses on influence of various polymer vapors like PA66, POM, PTFE, PMMA etc on the arc behavior and effect of venting on pressure distribution. The ablated polymer vapor, which is generated by strong arc radiation, changes the thermodynamic and transport properties of arc plasma. CFD Simulation showed the cooling of the arc plasma and improvement in gas flow. Three different generations (baffled grills, perforated plates, meshed wires) of vents were studied to obtain their pressure drop characteristics. Three dimensional CFD analysis of these vents were carried out by evaluating the porous jump coefficients and vent parameters. The study of the venting arrangement helped in better design of the vents with optimal pressure drop characteristics and deionization of the gases. The commercial computational fluid dynamics package FLUENT is customized to build electromagnetic capabilities for MCB arc extinction chamber. These two factors, ablative polymers and venting, affect and modify the arcing environment improving the overall quenching efficiency of a low-voltage circuit breaker.
机译:当低压断路器中断故障电流时,在断路器的触点之间建立电弧等离子体。本文重点介绍了PA66,POM,PTFE,PMMA等各种聚合物蒸气对电弧行为的影响和通风对压力分布的影响。通过强弧辐射产生的消融聚合物蒸气,改变了电弧等离子体的热力学和运输性能。 CFD模拟显示电弧等离子体的冷却和气流的改善。研究了通气孔的三种不同的几代(挡板,穿孔板,网状线),以获得其压降特性。通过评估多孔跳跃系数和排气参数来进行这些通气孔的三维CFD分析。通风装置的研究有助于更好地设计具有最佳压降特性和气体去离子的通风口。商业计算流体动力学封装流畅,以构建MCB Arc消光室的电磁能力。这两个因素,消融聚合物和通风,影响和改变电弧环境改善了低压断路器的整体淬火效率。

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