典型缺陷对高压储能电容器电场分布的影响  

Effects of Typical Defects on Electrical Fields in High-Voltage (Storage) Capacitors

作　　者：张血琴[1] 吴广宁[1] 李晓华[1] 边姗姗[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《西南交通大学学报》2008年第1期14-18,共5页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金委员会与中国工程物理研究院联合资助基金项目(10476022)

摘　　要：根据电容器的绝缘和工作特点,建立了内部、接触、重叠和油质4种典型缺陷模型,并用有限元方法分析二维平面轴对称电场.结果表明,内部缺陷处的电场强度可能超过介质额定工作场强,而且空间电荷密度越大,大脉冲放电负峰电压下的电场分布畸变越严重;接触缺陷的毛刺和氧化点均造成电场集中;重叠缺陷处的电场超过介质额定工作场强;油质缺陷处的电场强度小,也基本不受空间电荷的影响.Four typical defects, that is, inne on the insulation structure and its working r, contact, overlap and oil defects, were modeled based environment in high-voltage storage capacitors. Two dimensional axisymmetric electrical fields were analyzed with finite element method. The results show that the electrical field around an inner defect may be higher than the rated value of the dielectric, and distorts more significantly with a greater space charge density under reverse pulse voltages; contact defects （burrs and oxidized spots） cause electrical concentration; the electric field on the comer at an overlap defect is higher than the rated value of the dielectric; and oil defect does not cause high electrical field and basically unaffected by space charges.

关 键 词：高压储能电容器 缺陷 电场 仿真 

分 类 号：TM53[电气工程—电器]