摘要
为研究变压器套管电场的强垂直分量对操作冲击放电特性的影响,对3种电场分布不同的绝缘结构开展了真型试验。在2种波前时间下,获得了50%放电电压特性曲线,同时建立了110kV油纸电容式变压器套管模型,仿真研究了3种结构的电场分布情况,并通过高速摄影仪观测了3种结构操作冲击放电的过程。结果表明:垂直电场分量通过改变电场不均匀程度会影响操作冲击放电特性;去除电容芯子使垂直电场加强的结构,在操作冲击电压下发生了滑闪放电,空气间隙击穿的迎面流注–先导过程被滑闪放电取代,与标准套管相比,由于电场均匀性提高以及滑闪放电发展受伞裙阻挡,操作冲击放电电压预计升高约11.1%。
In order to study the effect of strong vertical components of electric field in a transformer bushing on switching impulse discharge characteristics,three structures with different electric field distributions were tested.The curves of 50%discharge voltage were obtained under two different wavefront time conditions.The bushing model of a 110 kV oil paper capacitor transformer was established,and the electric field distributions of three structures were studied by simulation.The processes of switching impulse discharge of three structures were observed by a high-speed camera.The results show that the vertical electric field component can affect the switching impulse discharge voltage by changing the degree of electric field inhomogeneity.For the structure where the capacitance core is removed to strengthen the vertical electric field,the sliding discharge will occur under switching impulses,and the upward streamer-leader process of air gap breakdown will be replaced by the sliding discharge.Compared with standard bushing products,the switching impulse discharge voltage is expected to increase by about 11.1%,which is due to the improvement of electric field uniformity and the barrier of sheds to the sliding discharge.
作者
黄哲恒
梅红伟
高超
李恩文
张福增
王黎明
HUANG Zheheng;MEI Hongwei;GAO Chao;LI Enwen;ZHANG Fuzeng;WANG Liming(Tsinghua Shenzhen International Graduate School,Shenzhen 518055,China;Electric Power Research Institute of China Southern Power Grid,Guangzhou 510080,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2021年第8期2838-2845,共8页
High Voltage Engineering
基金
国家重点研发计划(2017YFB0902702)。
关键词
变压器套管
电场强垂直分量
操作冲击电压
电场分布
滑闪放电
transformer bushing
strong vertical components of electric field
switching impulse voltage
electric field distribution
sliding discharge
