Pressure evolution during HBC fuse operation
Pressure evolution during HBC fuse operation
复制标题
HBC 熔断器运行期间的压力变化
DOI：
10.1088/0963-0252/13/2/015
复制
发表时间：
2004
影响因子：
3.8
通讯作者：
W. Bussière
中科院分区：
文献类型：
--
作者：
D. Rochette;W. Bussière
研究了高开断能力（HBC）熔断器中硅砂颗粒对能量释放过程中压力的影响。在HBC熔断器操作期间，压力演变是两个相反趋势的结果：由于二氧化硅等离子体与周围的粒状砂的相互作用而导致的压力增加，以及由于压力波向多孔介质的传播而导致的压力减小。由于熔断器灭弧过程中出现的现象比较复杂，因此将压力分为两类：石英等离子体内部的压力和石英砂中的压力。模拟结果表明，当电功率超过最大值的30%时，Forchheimer流动阻力大于Darcy流动阻力。在离熔丝元件轴线的不同位置处对计算的压力和测量的压力进行比较。实验得到两种不同的压力：由于等离子体压力施加在砂粒上的压力PSAND，以及流过硅砂间隙的气体的压力PGAS。我们发现，实验和计算的趋势是相似的，它们都依赖于电力水平和硅砂平均粒度。在最大电功率水平的同时观察最大压力。PSAND/PGAS的比值约为8，PGAS值不超过1.5 × 105 Pa。
The purpose of this paper is to describe the influence of the silica sand grains on pressure during the energy release in a high breaking capacity (HBC) fuse. During the HBC fuse operation, the pressure evolution is the result of two opposite trends: the pressure increase due to the interaction of the silica plasma with the surrounding granular sand, and the pressure decrease due to the propagation of the pressure waves toward the porous medium. Due to the complex phenomena occurring during the current extinction by a fuse, two kinds of pressure are distinguished: the pressure inside the silica plasma and the pressure in the silica sand. From the simulations we show that the Forchheimer flow resistance is stronger than the Darcy flow resistance once the electric power is over 30% of the maximum value. A comparison of the calculated and measured pressures is made at various positions from the fuse element axis. Two different pressures are obtained experimentally: the pressure PSAND exerted on the sand grains due to the plasma pressure, and the pressure PGAS of the gas flowing through the interstices of the silica sand. We show that the experimental and calculated trends are similar and they both depend on the electric power level and the silica sand mean granulometry. The maximum pressures are observed at the same time as the maximum electric power levels. The ratio PSAND/PGAS is about 8 with PGAS values not exceeding 1.5 × 105 Pa.
DOI：
10.1007/978-94-009-1926-6
发表时间：
1990-03
期刊：
--
影响因子：
--
作者：
Jacob Bear;Y. Bachmat
通讯作者：
Jacob Bear;Y. Bachmat