三电极结构流注放电试验平台

Streamer Discharge Test Platform with Three-electrode Structure

流注的产生和传播是空气间隙击穿过程中最为重要、物理过程最为复杂的一个阶段,为深入研究空气间隙流注放电过程,搭建了三电极结构流注放电试验平台(均匀场和非均匀场)。并基于均匀场下的三电极结构流注发生装置,通过调整电极结构来改变外加电场,提出了一种不均匀场下的三电极结构流注发生装置。通过在针电极上施加方波脉冲触发产生正流注在外加电场中传播,利用光电倍增管和高速摄影仪同步进行流注放电过程的光学检测。在此试验平台上初步开展了三电极结构中流注放电的试验研究,并获得了流注的稳定传播电压、传播速度、传播路径等特征参数。试验结果表明:该套三电极结构流注放电试验平台效果良好,三电极结构中外电场对流注传播特性有明显的影响:流注传播速度随着外加电场强度的提高而提高;在不均匀场下,流注的发展路径较均匀场中更为扩散,分叉数目更多。基于此试验平台展可开展进一步的试验研究。

The generation and propagation of streamer is the most important and most complicated period in the breakdown of the air gap. In order to study the process of streamer discharge deeply, the three-electrode structure test platform(uniform electric field and non-uniform electric field) was built up. Based on the streamer generation device of three-electrode structure in uniform electric field,the external electric field was altered through changing the electrode structure. So, the device of three-electrode structure in non-uniform electric field was proposed creatively. The streamer was triggered by the positive square-wave pulse applied on the needle electrode. And the photomultipliers and an intensified CCD camera were utilized to detect streamer discharge synchronously. The streamer discharge was preliminarily experimentally studied on this test platform. The streamer discharge characteristics, such as stable propagation voltage, propagation velocity, path and so on, were obtained. Test results show that this test platform works well. The external electric field has a great influence on the streamer discharge characteristics. The streamer velocity increases as the electric field improves. Under a non-uniform electric field, the streamer path is more divergent and the branch number is higher than that under the uniform electric field. This platform can be used to conduct further experimental research on the streamer discharge characteristics.