摘要
高压直流输电过程中,环氧绝缘材料由于电荷积聚而导致击穿或放电效应,严重影响电网安全运行。通过直流实验装置,借助电容探讨法,针对环氧绝缘材料表面电荷进行测量,并利用Ansoft软件计算电极表面静电场,获得表面电荷分布情况,建立环氧绝缘材料电气性能和电荷积聚的关系。结果表明,平面指向性双电级表面电荷表现为显著的双极性积聚特性,即阳极侧积聚正电荷,阴极侧积聚负电荷;随电压作用时间的延长,环氧绝缘材料电荷趋于饱和,电荷积累速度逐渐下降,并趋于稳定;随着电压等级的变化,近电极区表面电荷密度不断增大,中间区趋于稳定,当电压提高到8 kV时,由于气体侧局部放电,电荷密度出现激增。
In the process of high-voltage direct current transmission,the epoxy insulating material could cause breakdown or discharge effect by the charge accumulation,which seriously affected the safe operation of the power grid.Through the direct current experimental device,the surface charge of the epoxy insulating material was measured by means of the capacitance probe,and the electrostatic field of the electrode was calculated by using the software of Ansoft,and the relationship between the electrical property and the charge accumulation of the epoxy insulating material was established.The results show that the surface charge of the two-electric-stage surface of the planar directivity shows a significant double-polarity accumulation characteristic,which are the positive charge on the anode side and the negative charge on the cathode side.With the extension of the time of the voltage,the epoxy rejection the charge of the edge material tends to saturation,and the charge accumulation rate gradually decreases and tends to stabilize.With the change of voltage grade,the surface charge density of the near electrode region increases continuously,and the middle region tends to stabilize.When the voltage could raise 8 kV,the charge density increases sharply because of the local discharge on the gas side.
作者
付晓翠
FU Xiao-cui(Anhui Food Engineering Vocational College,Hefei 230013,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2019年第12期88-91,101,共5页
China Plastics Industry
基金
安徽省质量工程项目:高水平教学团队(2018jxtd099)
关键词
环氧绝缘材料
电荷积聚
直流输电
电荷密度
Epoxy Insulating Material
Charge Accumulation
Direct Current Transmission
Charge Density
作者简介
付晓翠,女,1966年生,副教授,主要从事工业电气自动化方向研究。电话:18956063798。
