诱导触发型气体间隙开关快速绝缘恢复特性研究

气体间隙开关结构简单、成本低，在电力系统中应用前景良好，但绝缘恢复特性研究尚少。为此，本文采用“双脉冲法”研究开关间隙、触发介质气压及其种类对气体开关绝缘恢复特性的影响规律。结果表明：喷射等离子体诱导型气体间隙开关绝缘恢复经历过渡期、f快速恢复期和饱和期3个阶段，饱和期的持续时间远大于前两阶段之和，且在快速恢复期无“平台现象”出现；减小开关间隙距离，气体开关绝缘恢复速率渐进增大，其绝缘基本恢复时间（绝缘恢复系数RU>90%）可降低50%；气压对气体开关绝缘恢复影响显著，对绝缘恢复过程的影响特性存在差异，增大气压会减缓气体开关的绝缘恢复过程，0.1 MPa~0.3 MPa压缩干燥空气中，气体间隙开关绝缘基本恢复时间对应11 ms~40ms；强电负性SF6对气体开关绝缘恢复速率具有明显增强作用，其绝缘恢复速率接近于空气中的4倍。研究结果可为气体间隙开关快速绝缘恢复技术提供理论指导。

Study on fast insulation recovery characteristics of induced gas gap switch

The jet plasma induced gas gap switch uses the jet plasma to inject the main gap to achieve rapid triggering and conduction. The structure is simple and the cost is low. It has important application prospects in the power system. However, if the insulation recovery of the gas switch is delayed, it will significantly increase the probability of re-breakdown of the switch. It is easy to cause mis operation and affect the reliability and safety of power supply. Therefore, this paper uses the '' double pulse method '' to study the influence of switch gap, trigger medium pressure and its type on the insulation recovery characteristics of gas switch. The experimental results show that the insulation recovery characteristics of the jet plasma induced gas gap switch experience three stages: transition period, fast recovery period and saturation period. The duration of the saturation period was much longer than the sum of the previous two stages, and there was no '' platform phenomenon '' in the rapid recovery period. With the decrease of gap distance, the insulation recovery rate of gas switch increases gradually, and the basic recovery time of gap insulation (insulation recovery coefficient RU > 90 %) can be reduced by 50%. The influence of air pressure on the insulation recovery of gas switch is significant, and the influence characteristics on the insulation recovery process are different. Increasing the air pressure will slow down the insulation recovery process of gas switch. In 0.1 MPa~0.3 MPa compressed dry air, the basic recovery time of gas gap switch insulation corresponds to 11 ms~40ms. The strong electronegative gas SF6 has a significant effect on the insulation recovery rate of gas switches, and its insulation recovery rate is close to 4 times that in air. The research results provide theoretical guidance for the rapid insulation recovery of jet plasma induced gas gap switch.