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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Investigation on critical breakdown electric field of hot carbon dioxide for gas circuit breaker applications
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Investigation on critical breakdown electric field of hot carbon dioxide for gas circuit breaker applications

机译：气体断路器应用中热二氧化碳的临界击穿电场研究

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摘要

Sulfur hexafluoride (SF6) gas is widely used in high-voltage circuit breakers, but due to its high global warming potential, substitutes are being sought. CO2 has been investigated as a candidate based on its arc interruption performance. The hot gas in the circuit breaker after current zero, with a complicated species composition caused by the dissociation and many other reactions, will lead to the electrical breakdown, which is one of the major concerns in assessing the arc interruption performance. Despite this, little research has been reported on the dielectric strength of hot CO2. In this paper, the dielectric properties of hot CO2 related to the dielectric recovery phase of the circuit breaker were investigated in the temperature range from 300 to 4000 K and in the pressure range from 0.01 to 1.0 MPa. Under the assumptions of local thermodynamic equilibrium (LTE) and local chemical equilibrium (LCE), the equilibrium compositions of hot CO2 were obtained based on Gibbs free energy minimization. The cross sections for interactions between electrons and the species are presented. The critical reduced electric field strength of CO2 was determined by balancing electron generation and loss. These were evaluated using the electron energy distribution function (EEDF) derived from the two-term Boltzmann transport equation. The result indicates that unlike SF6 or air, in hot CO2 the reduced critical electric field strength does not change monotonically with increasing heavy-particle temperature from 300 to 4000 K. CO2 has a superior dielectric strength to pure SF6 above 2500 K at 0.5 MPa, which means it has the potential to improve the interruption performance of the circuit breakers, while reducing the global warming effect. Good agreement was found with published experimental results and calculations for CO2 at room temperature, and with previous calculations for hot CO2.
机译：六氟化硫（SF6）气体广泛用于高压断路器，但由于其较高的全球变暖潜能，正在寻求替代品。已基于二氧化碳的电弧中断性能对二氧化碳进行了研究。电流为零后，断路器中的热气具有由解离和许多其他反应引起的复杂的物种组成，会导致电气击穿，这是评估电弧中断性能的主要问题之一。尽管如此，关于热CO 2的介电强度的报道很少。在本文中，研究了在温度范围为300至4000 K，压力范围为0.01至1.0 MPa的情况下与断路器的介电恢复阶段相关的热CO2的介电特性。在局部热力学平衡（LTE）和局部化学平衡（LCE）的假设下，基于吉布斯自由能最小化获得了热CO2的平衡组成。给出了电子与物质之间相互作用的横截面。通过平衡电子的产生和损失来确定CO2临界降低的电场强度。使用从两项Boltzmann输运方程得出的电子能量分布函数（EEDF）对这些进行了评估。结果表明，与SF6或空气不同，在热CO2中，降低的临界电场强度不会随重粒子温度从300 K增加到4000 K而单调变化。在2500 K以上，0.5 MPa的压力下，CO2具有比纯SF6更高的介电强度，这意味着它有可能改善断路器的中断性能，同时降低整体变暖的影响。发现与公开的实验结果和室温下的CO2计算以及先前的热CO2计算具有很好的一致性。

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