摘要
新型喷射气流灭弧防雷间隙是一种有效避免输电线路遭受雷击的防雷技术手段。为进一步论证其性能,利用Navier-Stokes(N-S)方程对气流灭弧暂态过程进行了描述,说明灭弧气丸爆炸产生的高速气流使温度场、速度场发生了急速变化,进而破坏了电弧能量的稳态,达到迅速灭弧的效果。并利用ANSYS AUTODYN有限元分析软件对气流与电弧的作用过程进行了仿真分析,表明灭弧气丸爆炸后会产生带有巨大能量的高速气体并迅速充满整个空间,该高速气体与电弧快速、全面作用并迅速破坏等离子体动态平衡,使电弧在0.2 ms内极快速熄灭。通过试验对仿真结果进行了验证,证明新型灭弧防雷间隙在雷击发生初期就迅速动作,可快速灭弧,且灭弧后依然有强气流存在,保证了电弧不会重燃。研究表明,该新型灭弧防雷间隙对于输电线路防雷极其有效。
Air-blast arc-quenching interrupter gap is effective in protecting electric transmission lines from lightning. To further verify the device＇s capability, we used Navier-Stokes CN-S） equations to illustrate the transient process of arc ex- tinguishing by airflow： the high-speed airflow generated by the explosion of arc-extinguishing bullet breaks the energy balance of arc through rapidly varying the arc＇s temperature field and velocity field and consequently puts the arc out. We also used the ANSYS AUTODYN to simulate how the airflow affects arcs. The simulation show that the fast and energet- ic airflow generated by the explosion of gas bullet quickly fills up whole space and immediately acts on arc, and it completely destroys the dynamic balance of plasma and extinguishes the arc within 0.2 ms. Moreover, we have experi- mentally verified the simulation results. It is obtained that the air-blast arc-quenching interrupter gap acts swiftly at the beginning of lightning, and it quickly extinguishes arc while remaining strong airflow inside long enough to prevent arc rebuming. In conclusion, the air-blast arc-quenching interrupter gap is solidly effective in protecting electric transmission lines from lightning.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2015年第1期28-34,共7页
High Voltage Engineering
基金
国家自然科学基金(50867002)~~
