Diagnostic of the self-healing of metallized polypropylene film by modeling of the broadening emission lines of aluminum emitted by plasma discharge
Diagnostic of the self-healing of metallized polypropylene film by modeling of the broadening emission lines of aluminum emitted by plasma discharge
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DOI：
10.1063/1.1858872
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发表时间：
2005-02
影响因子：
3.2
通讯作者：
J. Tortai;N. Bonifaci;A. Denat;C. Trassy
中科院分区：
文献类型：
--
作者：
J. Tortai;N. Bonifaci;A. Denat;C. Trassy
即使在高持续电压下，金属化薄膜电容器也具有自我修复的特性，即清除介质中的缺陷。这种自愈过程是瞬时弧光放电的结果。以前已经证明，在放电过程中，由于焦耳效应，金属被汽化，直到电弧熄灭。已经发现，放电持续时间与施加在构成电容器的金属化膜层上的机械压力成反比。这项研究的目的是了解这种自发熄灭的弧光放电所涉及的物理过程。发射光谱已被用来提供有关物理性质(温度、电子和中性粒子密度等)的信息。由自愈诱导的血浆。根据Al原子谱线的展宽和位移对实验光谱的分析表明，自愈过程导致从蒸发的金属中产生高密度和相对弱电离的铝等离子体。等离子体密度随着施加在膜层上的压力的增加而增加，因此，扩展等离子体区域所需的密度功率也增加了，正如实验所观察到的那样，电弧放电更快地熄灭。
Metallized-film capacitors have the property, even under high continuous voltage, to self-heal i.e., to clear a defect in the dielectric. The self-healing process is a consequence of a transient arc discharge. It has been previously shown that during the discharge, due to Joule effect, the metal is vaporized until the arc extinguishes. The discharge duration has been found to be inversely proportional to the mechanical pressure applied on the layers of metallized films making up a capacitor. The aim of this study is to understand the physical processes involved in this spontaneous extinction of the arc discharge. Emission spectroscopy has been used to provide information about the physical properties (temperatures, electronic and neutral particles densities, etc.) of the plasma induces by a self-healing. An analysis, based on the broadenings and shifts of Al atomic lines, of the experimental light spectra obtained has shown that the self-healing process leads to the generation, from the vaporized metal, of a high-density and relatively weakly ionized aluminum plasma. The plasma density increases with the pressure applied on the film layers and, consequently, the density power needed to extend the plasma zone increases as well and the arc discharge goes out faster as experimentally observed.