摘要
气体间隙开关动作迅速、结构简单,在电力系统中应用前景良好,但对其绝缘恢复特性研究尚少。为此,文中采用双脉冲法研究开关间隙距离、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:诱导触发型气体间隙开关绝缘恢复经历过渡期、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R_(U)>90%)可降低50%。触发介质气压对气体开关绝缘恢复特性影响显著,对绝缘恢复过程的影响特性存在差异。增大触发介质气压会减缓气体开关的绝缘恢复过程,0.1~0.3 MPa压缩干燥空气中,气体间隙开关绝缘基本恢复时间对应为11~40 ms。强电负性SF_(6)对气体开关绝缘恢复具有明显增强作用,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。
Gas gap switch has good application prospects in power systems,due to its quick response and simple structure.However,there is still little research on insulation recovery characteristic.Therefore,the double pulse method is used to study the influence of switch gap distance,trigger medium pressure and trigger medium type on the insulation recovery characteristics of gas switch.The experimental results show that the insulation recovery characteristics of induced trigger gas gap switch experience three stages:transition period,fast recovery period and saturation period.The duration of the saturation period is 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 R_(U)>90%)can be reduced by 50%.The influence of trigger medium pressure on the insulation recovery of gas switch is significant,and the influence characteristics on the insulation recovery process are different.Increasing the trigger medium pressure will slow down the insulation recovery process of gas switch.In 0.1~0.3 MPa compressed dry air,the basic recovery time of gas gap switch insulation corresponds to 11~40 ms.The strong electronegative gas SF_(6)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 gas gap switch.
作者
董冰冰
陶磊
李康
陈子建
DONG Bingbing;TAO Lei;LI Kang;CHEN Zijian(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China)
出处
《电力工程技术》
北大核心
2024年第2期163-169,共7页
Electric Power Engineering Technology
基金
国家自然科学基金资助项目(52107142)。
关键词
气体间隙开关
诱导击穿
双脉冲法
绝缘恢复特性
击穿电压
强电负性SF_(6)
gas gap switch
induced breakdown
double pulse method
insulation recovery characteristics
gas breakdown voltage
strong electronegative gas SF_(6)
