多物理场下薄膜电容器用聚丙烯材料劣化及诊断方法研究进展

doi:10.19595/j.cnki.1000-6753.tces.241154

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薄膜电容器可用于柔性直流换流阀、武器装备脉冲功率系统等多种大功率应用场合,其性能直接关系到整个系统的可靠性。薄膜电容器长期承受着电、热、机械等多物理场作用,其劣化问题不容忽视。该文基于薄膜电容器用聚丙烯材料,首先总结了聚丙烯薄膜材料在多物理场下的电荷输运行为、局部放电、电容量变化和击穿特性等;其次,分析了不同老化过程,包括热老化、电老化、机械应力作用、多物理场耦合老化等对聚丙烯薄膜材料特性的影响规律;然后,从局部放电、介电特性、电容值等方面归纳了薄膜电容器老化的诊断方法,梳理和总结了薄膜电容器的寿命预测方法;最后,对薄膜电容器材料劣化机理及检测技术相关研究提出了展望。

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关键词 ：薄膜电容器, 聚丙烯, 劣化机理, 诊断方法, 老化

Abstract：

Metallized polypropylene film capacitors are subjected to high pulse voltage, high temperature, and mechanical stress for a long time, which causes material degradation and seriously threatens the operational reliability of the entire system. The relevant research on polypropylene materials for film capacitors is summarized in order to clarify the degradation mechanism of film capacitors, grasp the key parameters affecting the degradation of film capacitors, and sort out the reliability and applicability of existing state detection and lifetime prediction methods.
Firstly, under the influence of multiple physical fields, the degradation of polypropylene film materials is closely related to space charge transport, partial discharge phenomenon, self-healing, and breakdown behavior. The intrinsic parameters of the material (such as crystallinity, film thickness, square resistance of the metallized film) and external factors (such as voltage form, pulse frequency, external temperature) can affect the above parameters or processes. The injection and detrapping of space charges are the main factors leading to material degradation. However, traditional space charge measurement methods currently cannot meet the space charge measurement needs of μm level film materials, and there is an urgent need to develop high-resolution space charge measurement methods.
Secondly, electrical stress, thermal stress, mechanical stress, and their coupling effects can affect the aging process of polypropylene materials. These factors first cause changes in the material structure, such as recrystallization, molecular chain breakage, altering the trap characteristics and carrier transport behavior of the material. This is then reflected in the macroscopic performance changes. Therefore, aging tests are very important in the material development process. However, the aging of film capacitor materials under the coupling of multiple physical fields is difficult to reproduce in the laboratory, which means that most current research on the aging of polypropylene materials only considers a single factor. It is urgent to conduct aging experiments under the coupling of multiple physical fields that are close to actual working conditions, in order to clarify the aging mechanism of film capacitor materials. Furthermore, further research is needed on how to decouple multiple stress aging.
Finally, effective diagnostic and lifetime prediction methods can improve the reliability of the system. The aging diagnosis methods for film capacitors include partial discharge diagnosis method, polarization and depolarization current method, tanδ detection method, and capacitance detection method. The DC partial discharge detection method can be used to determine the type of defect and provide guidance for the production process of materials. However, this part of the research is still in its infancy in China. Other diagnostic methods have various shortcomings and deficiencies. It is necessary to develop aging diagnosis methods that combine multiple criteria and means. The methods for lifetime prediction of film capacitors include traditional probability statistical method, probability statistical method considering performance degradation, and prediction method based on machine learning. These lifetime prediction models cannot fully consider failure mechanism, resulting in low prediction accuracy and limited applications. In the future, the lifetime prediction technology of film capacitors can be further developed by in-depth studying the aging mechanism and combining intelligent recognition and machine algorithm.

Key words： Film capacitor polypropylene degradation mechanism diagnostic method aging

收稿日期: 2024-07-03

PACS:

TM215

基金资助:

国家自然科学基金重大研究计划培育项目（92266110）和福建省自然科学基金项目（2022J01112）资助

通讯作者: 周远翔男,1966年生,教授,博士生导师,研究方向为高电压与绝缘技术。E-mail：zhou-yx@tsinghua.edu.cn

作者简介: 张云霄男,1990年生,教授,博士生导师,研究方向为高电压与绝缘技术。E-mail：zhangyx@fzu.edu.cn

引用本文:

张云霄, 张佳瑞, 蔡英健, 周远翔, 刘育豪. 多物理场下薄膜电容器用聚丙烯材料劣化及诊断方法研究进展[J]. 电工技术学报, 0, (): 2492947-2492947. Zhang Yunxiao, Zhang Jiarui, Cai Yingjian, Zhou Yuanxiang, Liu Yuhao. Research Progress on Degradation and Diagnostic Methods of Polypropylene Materials for Film Capacitors under Multiple Physical Fields. Transactions of China Electrotechnical Society, 0, (): 2492947-2492947.

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