摘要
目前国内外对变压器套管伞裙参数的研究较少,而且在已有的套管闪络特性研究中大部分采用空心套管试品,未考虑内部导电杆对套管外绝缘电场的影响。通过有限元COMSOL软件对500 k V变压器高压套管进行建模仿真,研究了淋雨条件下伞间距和伞伸出对套管外绝缘电场的影响。同时建立无导电杆和电容芯子的简化模型,研究了导电杆和电容芯子对套管外绝缘电场的影响。结果表明,伞间距增大使空气间隙电场相对极差明显降低,也使空气间隙平均电场略微上升。沿面路径平均电场随着伞伸出增大而线性减小,其相对极差在大伞伸出为85~100 mm时随着伞伸出增大而减小。无导电杆时,伞裙凹陷处电场强度略高,伞裙边缘处电场畸变减小,但套管外绝缘电场分布与有导电杆时基本相似。
At present there is few researches on shed parameters of transformer bushing at home and abroad. In addition,most of the existing studies on flashover characteristics of the bushing use hollow bushing as experiment object without considering the influence of the internal conductive tube on the insulation electric field. In this paper,a 500 kV transformer high-voltage bushing equivalent model is established by finite element softw are COM SOL in order to study the effect of shed spacing and overhang on bushing external electric field under rain condition. M eanwhile simplified model without conductive tube and capacitance core is established to study the effect of conductive tube and condenser on bushing external electric field. The results show that the increase of shed spacing leads to obvious decline of air gap field relative range,and also leads to subtle increase of air gap field strength. The average electric field along the surface path decreases linearly with the increasing of shed overhang,and the relative range decreases with the increasing of shed overhang when big shed overhang is in range of 85 - 100 mm. Without conductive tube,the electric field intensity increases slightly at the shed depressions while decreases at the shed edges. And bushing external electric field is similar to the equivalent model with condutive tube.
作者
姚瑶
郝艳捧
阳林
廖一帆
张福增
李立浧
YAO Yao;HAO Yanpeng;YANG Lin;LIAO Yifan;ZHANG Fuzeng;LI Licheng(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Electric Power Research Institute,CSG,Guangzhou 510663,China)
出处
《南方电网技术》
北大核心
2018年第5期37-43,共7页
Southern Power System Technology
基金
国家自然科学基金(51507067)
南方电网公司科技项目(CSGTRC-K163024)~~
关键词
变压器套管
淋雨
有限元法
伞间距
伞伸出
导电杆
transformer bushing
rain flashover
finite element method （FEM）
shed spacing
shed overhang
conductive tube
