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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Experimental and theoretical study of decay and post-arc phases of a SF6 transfer arc in DC hybrid breaking
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Experimental and theoretical study of decay and post-arc phases of a SF6 transfer arc in DC hybrid breaking

机译：DC混合断裂中SF6转移弧衰减和弧形阶段的实验与理论研究

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摘要

During DC hybrid breaking, the transfer arc temperature decays quickly due to fast current commutation from the mechanical switch to the parallel connected branch, which may lead to deviation from thermal equilibrium. In this study, numerical investigation on a two-temperature calculation for SF6 transfer arc has been performed in order to study the arc's behavior under the effect of thermal non-equilibrium. The free decay and post-arc phase have been studied. This model allows us to calculate electron and heavy-species temperatures, gas velocity, and electron number density. In addition, various energy exchange mechanisms including radiation, ohmic heating, and elastic collision energy are discussed. It has been predicted that the departure from thermal equilibrium appears near the arc edge and electrodes due to insufficient collision energy exchange between electrons and heavy species. Particularly the formation of a circular velocity vortex makes the gas temperature in the vortex zone exceed the arc core temperature at zero current, which does not favor the residual plasma withstanding the recovery voltage at post arc. After carrying out a simulated hybrid breaking experiment, the dynamic motion process of the transfer arc and post-arc current were determined experimentally and compared to theoretical results obtained from a two-temperature model. This comparison validated the model and showed that the presence of a vortex high-temperature zone is more prone to cause the breakdown.
机译：在DC混合断裂期间，由于从机械开关到平行连接的分支的快速换向，转移电弧温度衰减，这可能导致偏离热平衡。在该研究中，已经进行了对SF6转移弧的两个温度计算的数值研究，以便在热非平衡的影响下研究弧的行为。已经研究了自由衰减和后弧阶段。该模型使我们能够计算电子和重物温度，气体速度和电子数密度。另外，讨论了包括辐射，欧姆加热和弹性碰撞能量的各种能量交换机制。已经预测，由于电子和重沉重物种之间的碰撞能量交换不足，弧形边缘和电极出现在弧形边缘和电极附近。特别地，圆形速度涡流的形成使涡流区的气体温度超过零电流的弧核心温度，这不利于在柱弧处承受恢复电压的剩余等离子体。在进行模拟的混合动力断开实验之后，实验确定转移电弧和电弧电流的动态运动过程，并与从两个温度模型获得的理论结果进行比较。这种比较验证了该模型，并显示了涡旋高温区的存在更容易导致击穿。

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