摘要
复合绝缘子芯棒与绝缘护套之间出现空气或液体间隙时,间隙周围电场会发生畸变,高场强区域将会出现局部放电,造成复合绝缘子的耐老化性能、机械性能降低.为了精确评估间隙存在对电场分布的影响,以FXBW4-110/100型号的输电线路用复合绝缘子为例,基于ANSYS仿真软件建立复合绝缘子三维有限元模型,分析存在空气或液体间隙时复合绝缘子内部电场的强度,研究间隙尺寸、位置对电场强度分布的影响规律.研究结果表明,空气或液体间隙处电场强度均会增大,液体间隙长度足够大时间隙周围电场强度会超过空气击穿场强,引起局部放电;间隙长度越大或距离导线侧越近,间隙内场强越大,对绝缘子造成的破坏也会越严重.
If an air-gap or liquid-gap exists at|the interface between the core rod and sheath of composite insulator,the electric field strength around the gap would b?distorted.The partial discharge would appear in the high electric field region,which reduces the mechanical properties of rod and the insulation capacity of composite insulating material.To precisely access the influence of internal-defect gap on the eleclric field distribution,taking the FXBW4-110/100 type composite insulator as an example,we established a three-dimensional finite-element model of the composite insulator in ANSYS,and analyzed the strength of electric field in composite insulators with air w liquid gap,and studied the influence of gap size and location on lhe diMribulion of eleclric field strength.Th?results are as follows:the electric field intensity around the air-gap or liquid-gap increases substantially,and the electric field intensity around the liquid gap will exceed the air breakdown field strength when the liquid gap length is large enough,which will cause partial dischai^e.The greater the gap length or the closer the gap is to the wire side,lhe greater the electric field intensity in the gap,the more serious the damage to the composite insulator will be.
作者
杨哲
樊平
王庆丰
汪适文
陈娟
黄伟
吴冰琴
周冬
YANG Zhe;FAN Ping;WANG Qingfeng;WANG Shiwen;CHEN Juan;HUANG Wei;WU Bingqin;ZHOU Dong(College of Electrical and New Energy.Three Goikes University.Yichang 443000,Hubei.China;Jingmen Power Supply Company,State Grid Hubei Electric Power Co.,Ltd.,Jingmen 44S000,Hubei,China;Jingzhou Power Supply Company,Stale Grid Hubei Electric Power Co.,Ltd.,Jingzhou 434000,Hubej,China)
出处
《电网与清洁能源》
2019年第6期1-8,共8页
Power System and Clean Energy
基金
国家自然科学基金(61876097)~~
关键词
复合绝缘子
内部间隙
有限元法
场强分布
局部放电
composite insulator
internal gap
finite element method
electric field distribution
partial discharge
