摘要
为了研究瓷绝缘子伞裙处覆沙对其沿面电场和电位分布的影响,基于有限元法建立了XP-70型瓷质悬式绝缘子的二维对称静电场模型,并分析了在不同覆沙情况下绝缘子的沿面电场和电位分布。结果表明:瓷绝缘子的沿面电场整体呈“U”形分布,且电场与电位受瓷绝缘子几何形状与媒介材质的影响,在每片绝缘子的伞裙上下表面与金具的交界处,电场强度出现局部峰值;当绝缘子伞裙表面覆盖沙尘时,对其沿面电位的影响十分微弱,但伞裙覆沙处的场强会减小,靠近高压侧与低压侧的绝缘子场强减小幅度较大,且减小幅度与沙层厚度无关,随着绝缘子表面覆盖沙层厚度的增加,每片绝缘子伞裙上表面与金具交界处的场强都会先大幅增大然后减小到一个稳定值;当沙层中出现无沙带时,无沙带处的场强会增大,且增幅与沙层的厚度和无沙带的宽度相关。
In order to study the influence of sand covering at the umbrella skirt of porcelain insulator on the surface electric field and potential distribution,a two-dimensional symmetric electrostatic field model of XP-70 porcelain suspension insulator was established based on the finite element method,and the surface electric field and potential distribution of the insulator under different sand covering conditions were analyzed.The results show that the surface electric field of porcelain insulator shows U-shape distribution,and the electric field and potential are affected by the geometry of porcelain insulator and the medium material.There is a local peak of electric field strength at the junction point between the upper and lower surfaces of the umbrella skirt of each insulator and the fittings.When the insulator umbrella skirt surface is covered with sand,there is a weak effect on the its surface potential,but the field strength at the sand cover of umbrella skirt will decrease,and the field strength decrease amplitude of the insulators near the high voltage side and the low voltage side is greater.The decrease amplitude is not related to the sand layer thickness.With the increase of sand layer thickness on insulator surface,the field strength at the junction between the upper surface of each insulator umbrella skirt and the fittings will increase greatly at first and then decrease to a stable value.When there is no sand belt in the sand layer,the field strength at the no sand belt increases,and the increase amplitude is related to the sand layer thickness and the width of no sand belt.
作者
李彦昭
伍弘
刘世涛
柳萱
赵艺青
陈荣达
杨国华
LI Yanzhao;WU Hong;LIU Shitao;LIU Xuan;ZHAO Yiqing;CHEN Rongda;YANG Guohua(School of Electronic and Electrical Engineering,Ningxia University,Yinchuan 750021,China;State Grid Ningxia Electric Power Research Institute,Yinchuan 750011,China)
出处
《绝缘材料》
CAS
北大核心
2023年第5期88-94,共7页
Insulating Materials
基金
宁夏回族自治区重点研发计划重点项目(2021B DE931026)
国网宁夏电力有限公司科技项目(5229DK20004M)。
关键词
沙尘
瓷绝缘子
有限元法
电场
电位
sand and dust
porcelain insulators
finite element method
electric field
potential
