Degradation mechanisms-based reliability modeling for metallized film capacitors under temperature and voltage stresses

Hu, Y.; Ye, Xuerong; Zheng, Bokai; Zhao, Zichuan; Zhai, Guofu

doi:10.1016/j.microrel.2022.114609

Cited by 10 publications

(4 citation statements)

References 17 publications

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“…Until now, many researchers have examined the lifetime prediction of DCLCs under various conditions such as temperature, voltage, and humidity [4,[34][35][36]. However, there are no relevant studies in the literature on the examination of DCLC lifetime prediction based on insulation resistance.…”

Section: Effect Of Insulation Resistancementioning

confidence: 99%

Insulation Resistance Characteristics of Dry DC Link Capacitors in the Presence of High Temperatures and Operating Voltages

Sun,

Qiao,

et al. 2024

Energies

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Insulation resistance is a vital factor in dry DC link capacitors (DCLCs), and crucially influences their voltage equalization and energy storage performance. However, at present, there is a lack of experimental observation on the insulation resistance characteristics of DCLCs in the presence of high temperatures and operating voltages. In the present study, the insulation resistance and conductivity of DCLCs are methodically analyzed. For this purpose, the corresponding test platform is appropriately fabricated, the insulation resistance measurement experiments are performed at various temperatures and operating voltages, and the factors affecting the insulation resistance and conductivity of the DCLC are carefully examined. The results reveal that the insulation resistance of the DCLC reduces exponentially with the growth in voltage and operating temperature. When the operating voltage becomes greater than 4480 V or the operating temperature reaches higher than 70 °C, the decline in insulation resistance slows down. The conductivity of metalized polypropylene film in the DCLC increases exponentially with increasing voltage and temperature. By increasing the operating voltage from 1960 V to 5600 V and the temperature from 20 °C to 90 °C, the DCLC’s insulation resistance exhibits a descending trend from 891.30 MΩ to 2.14 MΩ, while its conductivity grows from 3.49 × 10−16 S/m to 1.47 × 10−13 S/m. The results reveal that the key factors affecting the insulation resistance of the DCLC are the polypropylene film and the metal evaporated from the metal layer. This research is anticipated to provide a valuable reference for the further development of science and technology pertinent to the insulation resistance of DCLCs.

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Section: Effect Of Insulation Resistancementioning

confidence: 99%

Insulation Resistance Characteristics of Dry DC Link Capacitors in the Presence of High Temperatures and Operating Voltages

Sun,

Qiao,

et al. 2024

Energies

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show abstract

“…Up till now, relatively few investigations have been devoted to the effect of mechanical stress on the life and insulation performance of DCLCs. Studies on MPFC lifetime and its influencing factors mainly focus on failure mechanisms, reliability evaluations, and MPFC lifetime predictions under temperature, voltage, and humidity conditions [9][10][11][12][13]. The explorations of mechanical stress performed in MPFCs were mainly concentrated on internal pressure distribution [14], the calculation of internal pressure [15], and breakdown characteristics [16,17].…”

Section: Introductionmentioning

confidence: 99%

Effects of Mechanical Stress on the Life and Insulation Performance of DC-Link Capacitors

Sun,

Qiao,

et al. 2024

Energies

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Mechanical stress is a crucial factor affecting the life and insulation performance of DC-link capacitors (DCLCs). However, at present, there is a lack of long-term experimental observations on the effects of mechanical stress on the life and insulation performance of DCLCs. The element-winding process for DCLCs is carried out by winding metalized film on a reel and adjusting the various winding tensions and pressures according to performance requirements, usually with a winding tension coefficient (WTC) of kT = 1.5. The pull pressure of the winding machine on the film produces tension during the elements’ winding process, and the tension in the film grows after the heat-setting process. In this study, by adjusting the four tension coefficients of the elements in the winding process, which were 1.4, 1.5, 1.6, and 1.7, various winding tensions of the DCLC components were changed. Additionally, various heat-setting shrinkage tensions were appropriately generated by setting different heat-setting temperatures (HSTs). Relevant test platforms were established, and a life aging test, insulation resistance measurement, and withstand voltage test were performed on these DCLCs at different tension coefficients and HSTs. The obtained results reveal that the mechanical stress of DCLCs is affected by the parameters of the material itself, including the tension coefficient during the winding process and the HST. The winding tension affects the life of DCLCs, such that those with the highest tension (kT = 1.7) demonstrate the longest life at an HST of 105 °C, whereas samples with the lowest tension (kT = 1.4) exhibit the longest life at an HST of 110 °C. HSTs are capable of improving the lifetime of DCLCs. HSTs are also able to improve the withstand voltage capability of DCLCs, but the tension is not proportional to the withstand voltage capability of DCLCs. This research provides a suitable basis for further explorations of the life and insulation performance of DCLCs.

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“…In Ref. [ 22 ], a reliability modeling method based on degradation mechanism for metallized film capacitors is proposed, in which the temperature and voltage stresses are considered. Taking metallized film capacitors as a case study, the effectiveness of this method is verified.…”

Section: Introductionmentioning

confidence: 99%

A reliability estimation method based on combination of failure mechanism and ANN supported wiener processes

Liu,

Qiao,

Wang

et al. 2024

Heliyon

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Degradation mechanisms-based reliability modeling for metallized film capacitors under temperature and voltage stresses

Cited by 10 publications

References 17 publications

Insulation Resistance Characteristics of Dry DC Link Capacitors in the Presence of High Temperatures and Operating Voltages

Insulation Resistance Characteristics of Dry DC Link Capacitors in the Presence of High Temperatures and Operating Voltages

Effects of Mechanical Stress on the Life and Insulation Performance of DC-Link Capacitors

A reliability estimation method based on combination of failure mechanism and ANN supported wiener processes

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