Investigation of Arc Dynamic Behavior Change Induced by Various Parameter Configurations for C4F7N/CO2 Gas Mixture

Energies Pub Date : 2024-07-16 DOI:10.3390/en17143485
Wen Wang, Xianglian Yan, Beiyang Liu, Yalin Bian
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Abstract

This study investigates the feasibility of using a mixture of C4F7N/CO2 gases as an eco-friendly arcing medium for high-voltage circuit breakers, comparing its performance to that of conventional SF6 gas. An existing magnetohydrodynamic (MHD)-based arc model is modified to incorporate the non-recombination characteristics of C4F7N. The temperature, pressure, and velocity distributions of the arc throughout the whole arcing process are systematically analyzed. First, the differences in multi-physical fields induced by the C4F7N non-recombination feature are highlighted. The effects of varying the C4F7N concentration from 4% to 10% in the C4F7N/CO2 gas mixture on the arc behavior are also computationally studied. The results indicate significant differences in the arc-extinguishing performance between C4F7N/CO2 and SF6 under identical operating conditions. The potential of using C4F7N/CO2 as a viable alternative to SF6 in circuit breaker applications may need further design efforts to optimize key components such as the driving mechanism and nozzle. Moreover, as the concentration of C4F7N increases, the gas mixture exhibits improved flow field characteristics, suggesting that a higher volume concentration of C4F7N enhances the gas’s short-circuit current interruption capabilities.
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不同参数配置对 C4F7N/CO2 气体混合物引起的电弧动态特性变化研究
本研究探讨了使用 C4F7N/CO2 混合气体作为高压断路器环保电弧介质的可行性,并将其性能与传统 SF6 气体进行了比较。对现有的基于磁流体力学(MHD)的电弧模型进行了修改,以纳入 C4F7N 的非再结合特性。系统分析了整个电弧过程中电弧的温度、压力和速度分布。首先,强调了 C4F7N 非再聚合特性引起的多物理场的差异。此外,还对 C4F7N/CO2 混合气体中 C4F7N 浓度从 4% 到 10% 的变化对电弧行为的影响进行了计算研究。结果表明,在相同的工作条件下,C4F7N/CO2 和 SF6 的灭弧性能存在明显差异。要想在断路器应用中将 C4F7N/CO2 作为 SF6 的可行替代品,可能需要进一步设计优化驱动机构和喷嘴等关键部件。此外,随着 C4F7N 浓度的增加,混合气体的流场特性也有所改善,这表明 C4F7N 的体积浓度越高,气体的短路电流中断能力就越强。
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