碳化硅表面改性对固体绝缘介质表面电荷聚散特性的影响研究  

Effects of Silicon Carbide Surface Modification on Surface Charge Accumulation and Dissipation Characteristics of Solid Insulation Medium

作　　者：凌超[1] 唐炬[1,2] 潘成[2] 王邸博 卓然 傅明利 LING Chao;TANG Ju;PAN Cheng;WANG DiDo;ZHUO Ran;FU Mingli(State Key Laboratory of Power Transmission Equipment and System Safety and New Technology,Chongqing University,Chongqing 400044,China;School of Electrical Engineering,Vguhan University,Wuhan 430072,China;Electric Power Research Institute,China Southern Power Grid Co.,Ltd.,Guangzhou 510080,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044 [2]武汉大学电气工程学院,湖北武汉430072 [3]南方电网科学研究院有限责任公司,广东广州510080

出　　处：《绝缘材料》2018年第9期29-35,共7页Insulating Materials

摘　　要：为了揭示涂覆碳化硅对固体绝缘介质表面电荷聚散特性的影响机制,本研究建立了基于静电探头的固体绝缘表面电荷的测量实验平台,通过对表面涂覆碳化硅的PMMA试样进行测定,获取了不同条件下固体绝缘介质的表面电荷分布特性。结果表明:涂覆碳化硅对绝缘材料表面电荷积聚的影响较小,而当碳化硅含量超过45%时,绝缘材料表面电荷消散速率明显加快,且由于碳化硅体积电导率与外加电场存在非线性关系,阈值电场随着涂覆碳化硅含量增加而降低,在涂覆较高含量碳化硅后,固体绝缘材料因积聚一定量的表面电荷使其表面等效电导率明显提升,表面电荷消散速率加快,对固体绝缘介质表面积聚的电荷起到了调控作用。In order to study the influence mechanism of silicon carbide（Si C） coating on the surface charge accumulation and dissipation characteristics of solid insulation medium, a surface charge measurement platform of solid insulation basing on electrostatic probe was constructed, and the surface charge distribution characteristics of the PMMA samples coated with Si C were obtained. The results show that the Si C coating has little influence on the surface charge accumulation characteristic of insulating materials. When the content of Si C is more than 45%, the surface charge dissipation rate of insulating materials accelerates obviously. Because there is a nonlinear relationship between volume conductivity of Si C and applied electric field, the threshold electric field decreases with the increase of Si C content. After coating with high content of Si C, the surface equivalent conductivity of solid insulation medium increases obviously due to the accumulation of a certain amount of surface charge, and the dissipation rate of surface charge increases obviously, which has regulatory effect on the charges accumulated on the surface of solid insulation medium.

关 键 词：表面电荷 电荷积聚 电荷消散 碳化硅涂料 静电探头法 

分 类 号：TM215[一般工业技术—材料科学与工程]