油浸纸套管电容芯子极板边缘电场分布的仿真及优化方法

发布时间：2018-05-10 08:13

本文选题：油浸纸套管 + 电容芯子　；参考：《电网技术》2017年05期

【摘要】：在各电压等级的电容式套管中普遍存在极板边缘电场效应。极板边缘电场突变,形成局部强场区,引发极板边缘放电,对电容式套管安全运行构成威胁。目前常规的电容芯子设计方法中,采用电容串联分压模型计算电容芯子径向电场及轴向电场,但该模型仅适用计算芯子内部平均电场。现有的仿真计算中考虑了套管局部及整体的电场分布,但忽略了极板厚度及边缘形貌,对极板边缘的电场缺乏细致分析,进而使得极板边缘电场控制措施不明。利用Infolytica有限元软件,仿真分析了油浸纸套管电容芯子极板边缘不处理、极板边缘单折边、加半导体纸等3种情况下极板边缘区域的局部场强可视化分布情况。研究结果表明,极板边缘不处理情况下极板边缘场强远大于极板中部均匀场强,极板边缘单折边、敷设半导体纸可分别使得极板边缘场强下降19%、33%。极板边缘单折边及敷设半导体纸的方式均可降低边缘场强。在实际套管电容芯子设计及生产过程中,建议采用10~20 mm宽度的单折边或敷设半导体纸改善边缘电场的方法,以电场分布的均匀化、不增加芯子主体尺寸的方式,降低极板边缘电场效应,提升套管安全运行水平。
[Abstract]:The electrode edge electric field effect is common in capacitive bushing with different voltage levels. The abrupt change of electric field in the edge of the polar plate forms a local strong field region, which causes the edge discharge of the electrode plate and threatens the safe operation of the capacitive casing. At present, in the conventional design method of capacitive core, the capacitance series partial voltage model is used to calculate the radial and axial electric field of the capacitor core, but this model is only suitable for calculating the average electric field inside the core. The local and global electric field distribution of the casing is considered in the present simulation calculation, but the thickness and the shape of the electrode plate are ignored, and the electric field of the edge of the electrode plate is not analyzed in detail, which makes the control measures of the electric field on the edge of the electrode plate unclear. By using Infolytica finite element software, the visualization distribution of the local field intensity in the edge region of the electrode plate is simulated and analyzed under three conditions: the edge of the capacitor core of oil-immersed paper casing is not treated, the edge of the electrode plate is single folded, and the edge of the plate is added with semiconductor paper. The results show that the field strength of the edge of the polar plate is much larger than that of the uniform field in the middle of the plate when the edge of the plate is not treated, and the electric field strength of the edge of the plate can be reduced by 19% and 33% respectively by laying the semiconductor paper on the edge of the plate. The edge field strength can be reduced by the single fold edge of the plate edge and the way of laying the semiconductor paper. In the design and production process of practical casing capacitor core, it is suggested to improve the edge electric field by single fold or laying semiconductor paper with a width of 10 ~ 20 mm, so as to homogenize the electric field distribution without increasing the main size of the core. Reduce the electric field effect on the edge of the pole plate and improve the safe operation level of the casing.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);南方电网科学研究院有限责任公司;
【基金】：国家高技术研究发展计划(863计划)(2015AA050204) 中央高校基本科研业务费专项资金资助(2016XS03) 中国南方电网公司2014年科技项目(K-KY2014-002)~~
【分类号】：TM41

【相似文献】