摘要
针对高温、高场下电极/绝缘材料界面粗糙度对绝缘材料空间电荷特性影响的研究有重要的意义。该文以电力设备常用主绝缘材料环氧树脂作为研究对象,制备了具有不同表面粗糙度的环氧树脂材料,使用基于电声脉冲法的空间电荷测试系统对不同温度、场强、电极/环氧树脂界面粗糙度等条件下的环氧树脂空间电荷分布进行了测量,并结合直流电导电流测试与电场仿真模型对不同电极/环氧树脂界面粗糙度下环氧树脂电荷作用机理展开了研究。空间电荷测试结果表明:在高温、高场的条件下,随着电极/环氧树脂界面粗糙度的增加,环氧树脂材料内部积聚的空间电荷密度逐渐增加,最大平均电荷密度达3.68 C/m^(3)。较大的电荷积聚产生了更为严重的电场畸变,最大电场畸变率达57.07%。进一步的机理研究表明,电极/环氧树脂界面粗糙度会大幅增加环氧树脂表面电场畸变,引发场助电荷注入量的增加,从而导致了环氧树脂试样内部更剧烈的电荷积聚。该研究阐释了电极/环氧树脂界面粗糙度对绝缘材料内部空间电荷特性的影响,为直流电力设备的结构优化设计与生产工艺改进提供了理论支撑。
It is of great significance to study the effect of electrode/insulating material interface roughness on space charge characteristics under high temperature and high electric field.Therefore,taking the epoxy resin(EP),the main insulating material commonly used in electric equipment,as the research object,we prepared EP samples with different surface roughness.The space charge distribution of EP under different temperatures,different electric fields and different electrode/epoxy resin interface roughness was measured by a pulse electro-acoustic measurement system.Besides,based on the DC conduction current experiments and electric field simulation,the space charge mechanism of EP under different electrode/epoxy resin interface roughness was explored.The space charge experimental results show that,under the high temperature and high electric field,with the increase of electrode/epoxy resin interface roughness,the accumulated space charge density in EP increases,in which the maximum average space charge density is 3.68 C/m3.Due to the larger accumulated space charge density,the electric field distortion is more serious,and the maximum value is 57.07%.The further mechanism study shows that the electrode/epoxy resin interface roughness will greatly increase the surface electric field of EP and lead to the larger amount of field-assisted charge injection,further resulting in the more severe space charge accumulation in epoxy resin.This study explains the influence of electrode/epoxy resin interface roughness on space charge characteristics of insulating materials,which provides a theoretical support for structural optimization design and improvement of production process of DC electric equipment.
作者
庞曦
朱思佳
许天蕾
魏鼎欣
谢宗良
刘鹏
PANG Xi;ZHU Sijia;XU Tianlei;WEI Dingxin;XIE Zongliang;LIU Peng(State Key Laboratory of Electrical Insulation and Power Equipment(Xi’an Jiaotong University),Xi’an 710049,China)
出处
《高电压技术》
北大核心
2025年第9期4717-4729,共13页
High Voltage Engineering
基金
国家自然科学基金(U23B20132)
电工材料电气绝缘全国重点实验室自主研究课题(EIPE23130)。
关键词
空间电荷
界面粗糙度
环氧树脂
电场畸变
直流电导
space charge
interface roughness
epoxy resin
electric field distribution
DC conductance
作者简介
庞曦,1997-,女,博士生,主要从事电工环氧基聚合物空间电荷输运机理与多物理场仿真计算研究工作,E-mail:pangxi@stu.xjtu.edu.cn;通信作者:刘鹏,1979-,男,博士,教授,主要从事高端交直流套管关键技术、特高压GIL关键技术、电力设备绝缘结构优化设计及多物理场仿真等方面的研究工作,E-mail:pengliu@xjtu.edu.cn。
