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 valuable data supports for the optimized design of metallized film capacitors.
作者
刘尚书
吴致远
仝殿杰
齐红斌
刘靖舟
王伟
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)
出处
《高电压技术》
CSCD
北大核心
2024年第12期5424-5434,共11页
High Voltage Engineering
基金
国家重点研发计划(2021YFB2401503)。
关键词
金属化膜
聚丙烯薄膜
多物理场
自愈特性
自愈参数
metallized film
polypropylene film
multi-physics field
self-healing characteristics
self-healing parameters
