轴向入射激光束触发空气间隙击穿的试验研究  

Experimental Study on Triggering Characteristic of Air Gap by Axially Irradiated Laser

作　　者：董勤晓[1] 杨泽锋[2] 刘之方[1] 党冬 周玮[1] 闫晔[1] 李永亮[1] 韩嘉旬 吴坚[2] 李兴文[2] 

机构地区：[1]中国电力科学研究院,北京100192 [2]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049

出　　处：《电器与能效管理技术》2016年第18期9-14,共6页Electrical & Energy Management Technology

基　　金：陕西省自然科学基础研究计划(2016JQ5001)

摘　　要：面向激光触发技术在电力系统中用于空气间隙同步触发的应用,基于沿电极轴向入射的1 064 nm、20 ns脉冲激光,系统研究了其触发68 k V空气间隙的触发性能,掌握了不同间隙电压时激光能量和焦点位置对触发性能的影响规律,并利用ICCD快速照相观察等离子体及放电通道的演变过程。结果表明,激光轴向入射时,提高激光能量和工作电压均能有效地降低触发的延时与抖动;当改变激光焦点位置时,焦点越靠近负高压电极其延时与抖动越小;斜向入射的激光束触发性能不及轴向正入射的激光束。因此,激光烧蚀电极产生的等离子体以及激光在空气中形成的电离通道,对诱导空气间隙击穿都具有显著的影响。Aiming at the prospective applications of the laser trigger on the power systems for synchronously triggering air gaps, the triggering characteristics of a 68 kV air gap by a 1064 nm, 20 ns laser beam were investigated. The influences of the laser power and the position of the laser focus on the triggering characteristics were studied under different gap voltage, and ICCD fast photography was utilized to obtain the evolutions of plasmas and discharge channel. Increasing the laser energy or the working voltage would reduce the delay time and jitter. The trigger delay and jitter are smaller when the laser focus is located closer to the high voltage electrode. The trigger perforrnanee becomes worse when the laser beam is focused on the high voltage electrode obliquely. These results indicate that both the laser-ablated plasma and the ionization channel in the laser path contribute to decreasing the trigger delay and jitter.

关 键 词：间隙开关 激光 轴向入射 击穿延时 等离子体 

分 类 号：TM501.2[电气工程—电器]