摘要
环氧树脂材料在电场作用下会出现表面电荷积聚现象导致沿面放电。为改善环氧树脂材料的直流绝缘性能,文中对环氧树脂试品表面进行局部粗糙度处理,开展闪络实验,探究局部粗糙度处理在空气、C_(4)F_(7)N/CO_(2)混合气体和SF_(6)3种气体环境中对环氧树脂试样闪络特性的影响。建立二维仿真模型,通过有限元法分析局部粗糙度处理后环氧树脂材料的表面电荷特性以及陷阱分布。根据闪络实验结果,粗糙面位置不同的环氧树脂试品的沿面闪络电压在3种气体中均随表面粗糙度的增加呈现先上升后下降的趋势,并在粗糙面位于中心且表面粗糙度为1.3μm时达到最大值。仿真结果显示,对于指型电极,环氧树脂材料表面积聚双极性表面电荷,当粗糙面位于试品中心时空穴陷阱和电荷陷阱的密度较小。因此可认为对环氧树脂的局部粗糙度处理能够改变其沿面闪络特性与表面电荷特性,通过合理选择粗糙面的位置以及粗糙度的数值可改善环氧树脂的直流绝缘性能。
The epoxy resin material will,under the action of electric field,occur surface charge accumulation,re⁃sulting in discharge along the surface.In order to improve the DC insulation properties of epoxy resin material,the surface of epoxy resin sample is subject to partial roughness treatment in this paper.The flashover experiment is con⁃ducted to investigate the effect of partial roughness treatment on the flashover characteristics of epoxy resin samples in air,C_(4)F_(7)N/CO_(2)gas mixture and SF_(6).And a two⁃dimensional simulation model is set up,the surface charge char⁃acteristics and trap distribution of the epoxy resin material after partial roughness treatment is analyzed by finite ele⁃ment analysis.According to the flashover experiment result,the surface flashover voltage of epoxy resin samples with different roughness surface positions shows the trend of increases first and then decreases with the increase of surface roughness in three kinds of gases,which reaches the maximum when the surface roughness is 1.3μm with the rough surface being at the center of the sample.The simulation results show that bipolar charge accumulates on the surface of the epoxy resin for finger electrodes,the density of cavity trap and charge trap is small when the rough surface is at the center of the sample.It can be therefore considered that the surface charge and flashover characteristics of the ep⁃oxy resin can be changed by partial roughness treatment of the epoxy resin,and reasonable selection of rough surface location and roughness value is helpful to improve DC insulation properties of the epoxy resin.
作者
律方成
宋曼青
詹振宇
阮浩鸥
闫纪源
谢庆
LYU Fangcheng;SONG Manqing;ZHAN Zhenyu;RUAN Hao’ou;YAN Jiyuan;XIE Qing(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense,North China Electric Power University,Heibei Baoding 071003,China)
出处
《高压电器》
CAS
CSCD
北大核心
2022年第7期149-161,198,共14页
High Voltage Apparatus
基金
国家重点研发计划资助(2017YFB0902500)
国家电网有限公司总部科技项目资助(环保型管道输电关键技术)。
关键词
环氧树脂
局部打磨
粗糙度
表面电荷
直流绝缘性能
epoxy resin
partial treatment
roughness
surface charge
DC insulation properties
