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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。
The application of laser triggering technology in power system for air-gap synchronous triggering is based on the pulsed laser of 1 064 nm and 20 ns incident along the axial direction of the electrode. The triggering performance of the air-triggering 68 k V air gap is studied systematically. The influence of laser energy and focal position on the triggering performance under the gap voltage, and the evolution of plasma and discharge channels were observed by ICCD. The results show that both the laser energy and the operating voltage can effectively reduce the delay and jitter when the laser beam is incident on the laser axis. The smaller the delay and jitter when the focal point is changed to the negative high voltage electrode, The incident laser beam is less effective than the axially incident laser beam. Therefore, the plasma generated by the laser ablation electrode and the ionization channel formed by the laser in the air have a significant effect on inducing air gap breakdown.