Metallized film capacitors (MFCs) are used in many applications requiring high volumetric energy characteristics. Along with an increase in the dielectric permittivity of the polymer film, operating in overload mode is a simple way to dramatically increase the energy density of capacitors for relatively short periods. The unique feature of MFC, a self-healing (SH) ability, makes this possible. However, the task is complicated by the lack of information on the energy characteristics of SH in real capacitors, especially when they are voltage overstressed. Part 1 of this article contains the results of experimental investigations of SH processes in overload modes under the soft-training test. At the level of voltage up to 8 of nominal values, three types of SH were discovered: single, repetitive, and multiple. The energy characteristics of SH processes obtained in real MFCs varied widely from those in the literature data. The cumulative SH energy characteristic was introduced and proposed for diagnostic purposes. The reasons for repetitive SH were investigated and analyzed. Equivalent parallel resistance as a sensitive diagnostic parameter of the overloaded MFC was chosen and applied.

中文翻译：

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金属化薄膜电容器在过载模式下的自愈过程》图 1：实验观察


金属化薄膜电容器 (MFC) 用于许多需要高体积能量特性的应用。随着聚合物薄膜介电常数的增加，在过载模式下运行是一种在相对较短的时间内显着提高电容器能量密度的简单方法。 MFC 的独特功能，即自我修复 (SH) 能力，使这成为可能。然而，由于缺乏有关实际电容器中 SH 能量特性的信息，特别是当它们电压过大时，这项任务变得很复杂。本文的第 1 部分包含软训练测试下过载模式下 SH 过程的实验研究结果。在电压达到标称值的 8 倍时，发现了三种类型的 SH：单次、重复和多次。实际 MFC 中获得的 SH 过程的能量特征与文献数据中的特征有很大差异。引入并提出累积 SH 能量特性用于诊断目的。对重复SH的原因进行了调查和分析。选择并应用等效并联电阻作为过载 MFC 的敏感诊断参数。