爆轰气流截断电弧及重燃抑制的仿真与试验研究

Simulation and Experimental Research on Detonation Airflow Interrupting Arc and Reignition Suppression

鉴于新型爆轰气流防雷间隙尚缺乏重燃抑制机理与能力的研究,对此进行爆轰气流式防雷间隙的气流截弧及重燃抑制仿真,并通过冲击与工频续流相结合的联合试验对其截弧和重燃抑制效果进行验证。首先研究了爆轰气流作用于电弧的工作原理,并通过能量平衡理论建立气流场和电弧耦合的三维可压缩磁流体力学模式;其次利用COMSOL Multiphysics仿真软件进行磁流体动力学仿真;最后通过搭建爆轰气流试验平台进行工频续流遮断试验。仿真结果表明,爆轰气流将在工频续流的初始发展阶段强烈作用,可在3ms内截断电弧并抑制重燃。试验结果表明,试品成功熄灭110kV等级的工频电弧并在后续时间内电弧未发生重燃,爆轰气流的持续时间对抑制电弧重燃的效果影响重大。

In view of the lack of research on the mechanism and capability of reignition suppression in the new detonation airflow lightning protection gap,the simulation of the airflow intercepting arc and reignition suppression of the detonation airflow lightning protection gap is carried out.The arc interception and reignition suppression effect are verified through the joint test of combination of impact and power frequency continuous current.Firstly,the working principle of the detonation air flow acting on the arc is studied,and three-dimensional compressible magneto hydrodynamic model of the air flow field and the arc coupling is established through the energy balance theory.Secondly,the COMSOL Multiphysics simulation software is used to simulate the magneto hydrodynamics.Finally,apower frequency continuous flow interruption test is carried out by building a detonation airflow test platform.The simulation results show that the detonation airflow will have a strong effect in the initial development stage of the power frequency continuous flow,which can cut off the arc and suppress reignition within 3 ms.The test product successfully extinguished the 110 kV power frequency arc and did not reignite the arc in the subsequent period.The duration of the detonation airflow has a significant impact on the effect of suppressing the reignition of the arc.