基于空间电荷分布的直流ZnO电阻片老化机理及状态评估方法研究

项目名称： 基于空间电荷分布的直流ZnO电阻片老化机理及状态评估方法研究

项目编号： No.51507135

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 电工技术

项目作者： 王倩

作者单位： 西安理工大学

项目金额： 22万元

中文摘要： 本项目拟以直流ZnO电阻片为研究对象，利用现有的背靠背老化试验系统，考虑实际运行时换向过冲及脉动电压的影响，系统地开展ZnO电阻片长期加压下性能变化的研究。借助TSC、PEA空间电荷测试技术，材料介电特性和微观结构的测试技术，围绕空间电荷在晶界结构变化过程中的特性展开研究。将晶界势垒作为空间电荷与显微结构、宏观性能之间的桥梁，建立微观结构参数和宏观性能之间的物理关系。得到老化过程中介电特性与宏观电气特性之间的定量表征方法。进一步研究ZnO电阻片老化过程中空间电荷的积累和迁移规律，提出以空间电荷特性为依据的直流ZnO电阻片老化程度的评价新方法。通过本项目的研究，能够揭示直流ZnO电阻片的老化机理，为工程实际应用直流ZnO电阻片的老化评判方法以及材料改性提供必要的理论支撑。

中文关键词： 直流ZnO电阻片；老化机理；状态评估；空间电荷

英文摘要： In the study, DC ZnO varistors is chose as research object. The existing back-to-back aging system is used for its voltage-endurance test, and the influence of shutdown voltage overshot and harmonics occurs in actual operation is considered. The space charge characteristics in the changing process of grain boundary structure are studied by means of the space charge testing techniques(TSC, PEA), the testing techniques of dielectric properties and microstructures. The grain boundary barrier is taken as a bridge between space charge and microstructures, and it taken as a bridge between space charge and macroscopic properties too. Thus the relationship between microstructure parameters and electrical performances is established, and the quantitative relationship between dielectric properties and electrical performances is determined. A further study on the law of space charge accumulation and transport in the process of DC ZnO varistors aging can put forward a new DC ZnO varistors aging evaluation method based on its space charge properties. The study is helpful to further grasp the aging mechanism of DC ZnO varistors, and it can provide theoretical support for material modification and engineering application aging evaluation method of DC ZnO varistors.

英文关键词： DC ZnO varistors; aging mechanism;state evaluation;space charge