Electrode corrosion degradation in metallized polypropylene capacitors

Yializis, A.; Cichanowski, S. W.; Shaw, David G.

doi:10.1109/icei.1980.7470881

Cited by 14 publications

(1 citation statement)

References 2 publications

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“…Work on the electrode corrosion in FCs by A. Yializis et al. indicates that the generation of corrosion requires AC voltage and moisture [6].…”

Section: Introductionmentioning

confidence: 99%

Reliability criterion of film capacitor based on moisture diffusion in encapsulation

Qiu

et al. 2023

High Voltage

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The current reliability criterion (RC) of the film capacitor (FC) is usually a fixed value, which does not consider the staged capacitance loss caused by moisture diffusion under high temperature and/or high humidity. The expected lifetime of capacitors would deviate far from the actual one. The moisture diffusion process of the encapsulated FC is analysed based on Fick's second law. In order to investigate the capacitance loss and moisture diffusion characteristics, 4 types of film capacitors are stressed with AC voltage under different temperatures and humidities. Based on the staged analysis of the capacitance and weight gain curves, the effect of moisture diffusion on capacitance loss is revealed. Results indicate that the linear stage of capacitance loss corresponds to the Fickian moisture diffusion stage of weight gain. The effect of voltage on FC aging is the most significant. The capacitance loss rate increases by 301% when the voltage rises by 30%. An RC calculation method of the FC is further proposed, which could also screen the encapsulation quality and shorten the aging test duration by at least 80%.

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“…Work on the electrode corrosion in FCs by A. Yializis et al. indicates that the generation of corrosion requires AC voltage and moisture [6].…”

Section: Introductionmentioning

confidence: 99%

Reliability criterion of film capacitor based on moisture diffusion in encapsulation

Qiu

et al. 2023

High Voltage

View full text Add to dashboard Cite

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Mission profiles and hygrothermal conditions: Its effects on the reliability of a soft switching converter

León-Aldaco

Calleja

Aguayo

2020

Microelectronics Reliability

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Failure mechanism of metallized film capacitors under DC field superimposed AC harmonic: From equipment to material

Li,

Zhou,

Wang

et al. 2024

High Voltage

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This study focuses on the degradation behaviour of metallised film capacitors, which are the essential components for the stability of converter valves in flexible ultra‐high voltage direct current (HVDC) transmission systems. Through systematic experimentation, we investigated the failure mechanisms of MFCs under HVDC fields with superimposed harmonics, considering both equipment and material perspectives. The experiments subjected capacitors to 500 h of ageing under two conditions: a DC/AC‐superimposed field with a constant DC component of 290 kV/mm and an AC ripple rate varying from 12% to 28%, and a control group aged solely under a DC field. Our findings indicate that capacitors aged under the DC/AC‐superimposed field exhibited shorter lifespans and more significant capacitance loss than those aged under only the DC field. This difference in performance is primarily attributed to the distinct electrode loss behaviours observed under each ageing condition, which are key factors in the capacitors' capacitance decay. Moreover, the biaxially oriented polypropylene films in the DC‐aged samples showed more severe deterioration, characterised by more noticeable molecular chain scission and reduced breakdown strength, compared to those aged under the DC/AC superimposed field. This difference is partly due to the moderate temperature increase caused by harmonics, which benefits the aggregation structure, and partly to the reduced molecular structure damage from the AC field.

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Electrode corrosion degradation in metallized polypropylene capacitors

Cited by 14 publications

References 2 publications

Reliability criterion of film capacitor based on moisture diffusion in encapsulation

Reliability criterion of film capacitor based on moisture diffusion in encapsulation

Mission profiles and hygrothermal conditions: Its effects on the reliability of a soft switching converter

Failure mechanism of metallized film capacitors under DC field superimposed AC harmonic: From equipment to material

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