灭弧装置内爆炸冲击波的数值模拟及其应用研究

摘要

The new-type jet stream arcing gap lightning protection device based on channel-type lightning idea is able to rap-idly respond lightning current and produce high-speed and high voltage gas shock wave resulted from explosion which may act on power-flow current in transient developing stage and cause extinguishment of electric arc.The arc-control device includes arcing TNT explosive,ring after lightning pole and semi-closed cylindrical arcing chamber.Therefore,this paper discusses establishment of mathematical model for semi-closed explosive shock wave of arc-control device by using ANSYS AUTO-DYN finite element analysis software in order to study attenuation propagation law of arcing explosive shock wave in semi-closed arcing chamber.According to propagation characteristics of explosive shock wave,it analyzes probable earliest cut point distribution of air gap power-flow current arc under the role of TNT explosive shock wave and its restriction role on re-strike of the gas arc.%基于疏导型防雷理念的新型喷射气流灭弧防雷间隙装置能快速响应雷电流,爆炸产生高速高压气流冲击波并作用于暂态发展阶段的工频续流致电弧熄灭。灭弧装置包括灭弧三硝基甲苯(Trinitrotoluene,TNT)炸药、环形接闪电极以及半封闭圆柱形灭弧室,为此,利用ANSYS AUTODYN 有限元分析软件,建立装有TNT炸药的灭弧装置半封闭爆炸冲击波数学模型,旨在研究灭弧爆炸冲击波在半封闭灭弧室内的衰减传播规律,并根据爆炸冲击波的传播特点分析空气间隙工频续流电弧在TNT爆炸冲击波作用下的可能最先切断点分布以及其对间隙电弧重燃的抑制作用。