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Shockwave Characteristics of Streamer Propagation in Insulating Liquids under Positive Lightning Impulse
IEEE Transactions on Dielectrics and Electrical Insulation ( IF 3.1 ) Pub Date : 2021-04-15 , DOI: 10.1109/tdei.2020.009238 Shuhang Shen , Qiang Liu , Zhongdong Wang
IEEE Transactions on Dielectrics and Electrical Insulation ( IF 3.1 ) Pub Date : 2021-04-15 , DOI: 10.1109/tdei.2020.009238 Shuhang Shen , Qiang Liu , Zhongdong Wang
This paper presents an experimental study focusing on the quantitative analyses of spatial characteristics of Mach-cone shaped shockwaves generated by streamers in a mineral oil and a synthetic ester in a fixed 12 mm needle-plane gap under positive lightning impulse. The influences of voltage level and liquid type are investigated. Results showed that Mach-cone shaped shockwaves are always observed ahead of actively propagating streamer channels. In the mineral oil, instantaneous streamer velocities undergo initial bursts before gradually decreasing and stabilizing at around 2 km/s. Shockwave pressures decrease from 6–8 GPa upon the streamer initiation to around 4 GPa as streamer propagates to a longer distance. Compared to the mineral oil, the initial bursts of instantaneous streamer velocities and shockwave pressures are lower in the synthetic ester. Investigated voltage levels from initiation to near breakdown do not impose significant effects on the observed shockwave parameters. In addition, the appearance of Mach-cone shaped shockwave is found to be an effective indicator of actively propagating streamer channel which can be used as a tool to quantify streamer main branches.
中文翻译:
正向雷电冲击下绝缘液体中流光传播的冲击波特性
本文提出了一项实验研究,侧重于在正向雷电脉冲作用下,在固定的12 mm针平面间隙中,矿物油和合成酯中的彩带产生的马赫锥状冲击波的空间特征的定量分析。研究了电压水平和液体类型的影响。结果表明,总是在主动传播的拖缆通道之前观察到马赫圆锥形的冲击波。在矿物油中,瞬时拖缆速度先经历爆发,然后逐渐降低并稳定在2 km / s左右。拖缆开始传播时,激波压力从拖缆开始时的6–8 GPa降低到大约4 GPa。与矿物油相比 在合成酯中,瞬时拖缆速度和冲击波压力的初始爆发较低。从启动到接近击穿的调查电压水平不会对观察到的冲击波参数产生重大影响。另外,发现马赫圆锥形冲击波的出现是主动传播拖缆通道的有效指示,可以用作量化拖缆主分支的工具。
更新日期:2021-04-16
中文翻译:
正向雷电冲击下绝缘液体中流光传播的冲击波特性
本文提出了一项实验研究,侧重于在正向雷电脉冲作用下,在固定的12 mm针平面间隙中,矿物油和合成酯中的彩带产生的马赫锥状冲击波的空间特征的定量分析。研究了电压水平和液体类型的影响。结果表明,总是在主动传播的拖缆通道之前观察到马赫圆锥形的冲击波。在矿物油中,瞬时拖缆速度先经历爆发,然后逐渐降低并稳定在2 km / s左右。拖缆开始传播时,激波压力从拖缆开始时的6–8 GPa降低到大约4 GPa。与矿物油相比 在合成酯中,瞬时拖缆速度和冲击波压力的初始爆发较低。从启动到接近击穿的调查电压水平不会对观察到的冲击波参数产生重大影响。另外,发现马赫圆锥形冲击波的出现是主动传播拖缆通道的有效指示,可以用作量化拖缆主分支的工具。