多物理场作用下的金属化膜自愈特性试验  

Experiment of Self-healing Properties of Metallized Films Under Multiple Physical Fields

作　　者：刘尚书 吴致远 仝殿杰 齐红斌 刘靖舟 王伟[1] LIU Shangshu;WU Zhiyuan;TONG Dianjie;QI hongbin;LIU Jingzhou;WANG Wei(Beijing Key Laboratory of High Voltage&EMC,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206

出　　处：《高电压技术》2024年第12期5424-5434,共11页High Voltage Engineering

基　　金：国家重点研发计划(2021YFB2401503)。

摘　　要：金属化膜电容器是柔性直流输电系统换流阀的核心元件,掌握电容器用金属化膜在复杂工作环境下的自愈参数,对高性能电容器的研制、提高能源输送效率具有关键性作用。该文基于金属化膜电容器实际运行工况,利用搭建的多物理场自愈测试平台,开展了金属化膜在电-热-力复合作用下的自愈特性测试,得出电压、温度、压强对金属化膜自愈的交互影响,随着温度的上升,电压对自愈特性的影响愈发明显,而随着压强的上升,电压对自愈特性的影响逐渐减弱,当压强达到4MPa以上时,电压对自愈特性影响非常小。通过对自愈特征量的统计,建立自愈参数间的关联关系,分析得到自愈面积和自愈数量呈负相关性,当有效区内自愈数量从1个/cm^(2)增加到30个/cm^(2)时,平均单个自愈点面积从16mm^(2)缩小为1mm^(2);自愈电流峰值、自愈时间与自愈电压呈正相关性,当电压达到3.5 kV时,自愈时间可达4μs,自愈电流峰值可达5 A;而自愈能量与自愈电压呈出幂指数为2.316的幂值函数关系;同时,根据自愈参数间的关联关系,提出了一种对自愈能量的快速估算方法。该研究涉及金属化膜材料性能的关键特征参数和判据集合,对金属化膜电容器的优化设计提供数据支撑。Metallized film capacitors are core components of the converter valves in flexible high-voltage direct-current(HVDC)transmission systems.Mastering the self-healing parameters of metallized films under complex operating condi-tions is crucial for the development of high-performance capacitors and improving energy transmission efficiency.Based on the actual operating conditions of metallized film capacitors,this paper utilizes a multi-physical field self-healing test-ing platform to conduct self-healing characteristic tests under the combined effects of electrical,thermal,and mechanical stresses.The study reveals the interactive effects of voltage,temperature,and pressure on the self-healing behavior of metallized films.It is found that as the temperature increases,the impact of voltage on self-healing becomes more re-markable;while as the pressure rises,the impact of voltage on self-healing gradually diminishes.When the pressure exceeds 4 MPa,the effect of voltage on self-healing becomes negligible.Through statistical analysis of self-healing char-acteristics,this paper establishes a correlation between self-healing parameters and concludes that the self-healing area and the number of self-healing points are negatively correlated.Specifically,when the number of self-healing points in the effective area increases from 1 cm–²to 30 cm–²,the average area of a single self-healing point decreases from 16 mm²to 1 mm².Furthermore,self-healing current peaks,self-healing time,and self-healing voltage are positively correlated.When the voltage reaches 3.5 kV,the self-healing time can reach 4μs,and the self-healing current peak can reach 5 A.The self-healing energy follows a power function with an exponent of 2.316 relative to the self-healing voltage.Based on the established correlation between self-healing parameters,this paper also proposes a rapid estimation method for self-healing energy.The research involves key characteristic parameters and criteria for the performance of metallized film materials,providing va

关 键 词：金属化膜 聚丙烯薄膜 多物理场 自愈特性 自愈参数 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM53