摘要
为研究不同电极间隙下变压器油击穿电压与电场分布的关联性,设计了5种不同的电极,在控制变压器油中其他影响因素不变的情况下进行击穿电压试验,与现有国家标准进行对比,验证了试验结果的有效性。通过仿真得到电极间隙中变压器油的电场分布云图,定义了电极间隙内场强超过90%最大场强的变压器油的体积(V_(90))和电极表面场强超过90%最大场强的面积(S90)两个分布特征量来描述电极间隙中变压器油的电场分布,提出了高场强区域在油中的纵深程度和在电极表面上的横向宽度两个概念。结果表明:对于相同的油样和电极间隙,当纵深程度和横向宽度越大时,油样发生击穿的可能性越大,定性解释了等距离下标准板-板电极的击穿电压低于标准球-球电极的击穿电压的现象。在特定电极结构类型下变压器油击穿电压与纵深程度和横向宽度存在近似线性关系,为研究变压器油的击穿特性提供了新的思路。
In order to study the relevance between breakdown voltage and electric field distribution in transformer oil, five kinds of different electrodes were designed and breakdown tests were performed with other influencing factors keeping unchanged for transformer oil, and the validity of test results was demonstrated by comparing with the existing national standard. The electric field distribution nephogram of transformer oil in electrode gap was obtained through simulation, and two characteristic parameters V 90 and S 90 were defined to describe the electric field distribution of transformer oil in electrode gap. V 90 is the volume of transformer oil with the field strength in electrode gap greater than 90% of maximum field strength, and S 90 is the area of electrodes with surface field strength greater than 90% of field strength. Two concept, including depth of high field strength region in oil and transverse width of high field strength region on the electrode surface, were proposed. The results show that for the same oil and oil gap, the larger the depth and transverse width, the larger the breakdown probability of the oil, which qualitatively explains the phenomena that the breakdown voltage of standard plane-plane electrodes is lower than that of standard sphere-sphere electrodes under the same gap distance. The breakdown voltages of transformer oil under specific electrode structure types have approximate linearity with the depth and transverse width, which provides a new idea for studying the breakdown characteristics of transformer oil.
作者
金颀
阮江军
邱志斌
唐烈峥
欧阳子卿
全妤
JIN Qi;RUAN Jiangjun;QIU Zhibin;TANG Liezheng;OUYANG Ziqing;QUAN Yu(Sehool of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)
出处
《绝缘材料》
CAS
北大核心
2018年第12期79-85,共7页
Insulating Materials
关键词
变压器油
击穿电压
电场分布
分布特征量
transformer oil
breakdown voltage
electric field distribution
distribution characteristic parameter
