雷电冲击电压下气制变压器油中流注放电发展机理研究  

Study on the Streamer-discharge Development Mechanism in Gas-made Transformer Oil Under Lightning Impulse Voltage

作　　者：陆怡冰 李峰 周游 卢武 赵文彬 LU Yibing;LI Feng;ZHOU You;LU Wu;ZHAO Wenbin(School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Hunan Province 2011 Collaborative Innovation Center of Clean Energy and Smart Grid,School of Electrical&Information Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]长沙理工大学电气与信息工程学院清洁能源与智能电网2011协同创新中心,长沙410114

出　　处：《高压电器》2023年第12期130-137,共8页High Voltage Apparatus

基　　金：国家自然科学基金项目(51707113)。

摘　　要：为深入研究气制变压器油在雷电冲击电压下的流注放电发展机理,文中通过搭建冲击电压放电实验平台,在流注起始电压阶段至加速电压阶段,对气制油中流注尖端电离过程和热效应引起的流注传播相关特征参量变化进行观测,以明确流注尖端电离过程和热效应在流注各个发展阶段的具体作用。研究结果表明,在流注起始阶段,流注的物理本质为局部气液相变化形成的低密度气体通道。在流注传播和击穿阶段,流注的物理本质为流注头部高场强导致的光电离过程,并在液体直接电离过程中导致气液相界面的持续产生。流注形态从光电离程度较弱的暗通道转变为光电离程度较强的亮通道是造成加速电压附近流注传播模式突变的机理原因。For studying the development mechanism of streamer discharge in gas-made transformer oil under light-ning impulse voltage,an impulse voltage discharge experimental platform was established to observe the changes of characteristic parameters related to the streamer propagation caused by the ionization process of the streamer tip and the thermal effect in the gas-made oil at the streamer initial voltage stage to the accelerating voltage stage.The aim is to clarify the streamer tip ionization process and the specific function of thermal effects in all stages of development of the streamer.The results show that in the streamer initiation stage,the physical nature of streamer is a low-density gas channel formed by local gas-liquid changes.While,in the streamer propagation and breakdown stage,the physi-cal nature of the streamer is the photo-ionization process caused by the high field strength of the streamer head.This process leads to the continuous production of the gas-liquid phase interface during the direct ionization process of the liquid.The change of the streamer morphology from a dark channel with a weaker photo-ionization degree to a bright-er channel with a stronger photo-ionization degree is the mechanism behind the sudden change in the streamer propa-gation mode near the accelerating voltage.

关 键 词：流注放电 气制变压器油 击穿电压 光电离 

分 类 号：TM855[电气工程—高电压与绝缘技术]