摘要
正极性长空气间隙放电是输变电系统外绝缘和雷电放电物理的研究基础,而流注—先导转化过程一直是长间隙放电机理以及雷电上行先导放电研究所关注的重点。为了获得流注—先导放电转化过程中电学、热力学参数演化规律及其关联关系,以1.0m棒–板空气间隙为研究对象,通过构建适用于流注—先导转化放电过程热特性试验观测系统,实现电压、高电位放电电流、放电通道光学形态、纹影图像的同步观测。获得从流注放电起始到先导通道形成过程的高速纹影图片,并通过Abel逆变换反演获得初始先导放电通道气体密度、温度的径向分布及其时间演化规律,发现因首次流注放电注入电荷量的增加,暗区时间内放电通道中心温度随时间的变化趋势由上升变为下降的两类现象。基于Gallimberti流注—先导转化零维模型,分析不同流注茎初始半径和能量分配系数对暗区内温度变化规律的影响,得出模型只适用于暗区温度上升的放电情况。该文的研究工作可为正极性先导起始判据修正和物理模型的完善提供参考。
The positive long air gap discharge is the research basis of the external insulation of power transmission and transformation system and lightning discharge physics research,while the streamer to leader transition process has been the focus of the long gap discharge mechanism and the research of lightning upward leader discharge.In order to obtain the evolution law of electrical and thermodynamic parameters and their relationship in the process of streamer to leader transition,the 1.0 m rod-plate air gap was taken as the research object,and the thermal characteristics test observation system for streamer to leader transition process was constructed.The system realized the simultaneous observation of voltage,high potential discharge current,discharge channel optical image,and schlieren image.The high-speed schlieren images were obtained from the beginning of the streamer discharge to the formation of the leader channel.The radial distribution of gas density,gas temperature and their time evolution were obtained by Abel inverse transformation.With the increasement of injected charge of first streamer,the two trends of the discharge channel center temperature from the rise to the decrease in the dark region were obtained.Based on the Gallimberti streamer to leader transition 0-dimensional model,the effects of the initial radius and energy partition coefficient on the temperature variation in the dark region were obtained.It is concluded that the model is only suitable for the discharge in which the temperature rises in the dark period.The research work in this paper can provide reference for the correction of the positive leader inception criterion and the improvement of the physical model.
作者
程晨
贺恒鑫
胡锦洋
陈维江
夏胜国
边凯
何俊佳
CHENG Chen;HE Hengxin;HU Jinyang;CHEN Weijiang;XIA Shengguo;BIAN Kai;HE Junjia(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China;State Grid Corporation of China,Xicheng District,Beijing 100031,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第4期1359-1368,1426,共11页
Proceedings of the CSEE
基金
国家重点研发计划项目(2016YFB0900801)
国家自然科学基金项目(51607076)
国家电网公司科技项目(GY71-17-041)。
