Research on the self‐healing failure characteristics and its protection methods of high‐voltage self‐healing capacitors

Yan, Fei; Wang, Zijian; Yin, Tao

doi:10.1049/joe.2018.8775

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…Biaxially oriented polypropylene (BOPP) film possesses impressive electrical properties with low dielectric loss that is pivotal to develop high-performance capacitors for streamlined power applications [1][2][3] . The capacitor that employs BOPP film as a dielectric after evaporation of the metal layer can be regarded as a metallized film capacitor(MPFC) 4 . Compared with the traditional electrolytic capacitor, MPFC has the advantages of long service life, larger breakdown voltage, high-temperature resistance, and ability to withstand larger ripple current [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal stress on the life of DC link capacitors for smart grid

Sun,

Qiao,

et al. 2024

Preprint

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Thermal stress is an important factor affecting the life of a DC link capacitor (DCLC). However, relevant studies on thermal stress mechanism directly influencing the lifetime of the capacitor are rarely reported. In this paper, the thermal polymerization of DCLC has been analyzed, and the relevant experimental platforms have been developed to evaluate the breakdown strength of DCLC at two thermal polymerization temperatures (TPTs). Simultaneously, the aging analysis of DCLC at different TPTs and the accelerated lifetime measurements at various temperatures were also executed to attain insights into the influence of thermal stress on the lifetime of DCLC. The results showed that the stress caused by thermal polymerization and working temperature influenced the breakdown voltage capability and the lifetime of DCLC. With an increase in TPT by 5 °C, a step-increase in the withstand voltage capability of DCLC from 7,000 V to 7,200 V was observed that demonstrated an enhancement of 2.86%in the breakdown strength performance. Correspondingly, the lifetime of DCLC with a capacitance change rate of -3% enhanced from 1,500 hours to 1,700 hours. However, severe deterioration in the life span of DCLC from 4,200 hours to 500 hours was observed with an increasing operating temperature from 55 °C to 85 °C, respectively. The lifetime could be enhanced by increasing the thermal polymerization temperature as well as reducing the working temperature. The presented results could be termed a harbinger for industrial production of high-performance DCLC with enhanced lifetime that augers well for high-power applications.

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Section: Introductionmentioning

confidence: 99%

Effect of thermal stress on the life of DC link capacitors for smart grid

Sun,

Qiao,

et al. 2024

Preprint

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“…However, self-healing is the most important function of a dielectric material; this involves removing the metal layer deposited when the dielectric material is damaged by temperature and voltage [20,21]. PPS is not used as a capacitor material as its self-healing function is poor and it does not remove any metal deposition layer, which might lead to a fire accident [22][23][24][25]. Moreover, the application of a PEI film in the capacitance design is difficult as the film thickness is 5 µm [15].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Influence Factors for Heat Generation Minimization of DC-Link Capacitor

2020

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With the rapid development of ecofriendly cars, various inverters are also being developed depending on the performance of motors. The DC-link capacitor is used as an inverter component; however, there are several limitations on its size, such as the requirement for wide films. Film width is a major factor that affects the capacitor’s equivalent series resistance (ESR) and is closely related to heat generation. When the temperature of the capacitor increases, the dielectric breakdown due to high voltage causes a reduction in capacitance, which leads to a decrease in inverter power and causes vehicle defects; this needs to be addressed to minimize the heat of the capacitor. Recently, genetic films that can be used at high temperatures have been developed. However, producing such films is difficult because of their 5 µm thickness; thus, the size increases when they are designed and they consequently cannot be used in practical applications. Based on a film width of 50 mm, this study analyzed the factors that can reduce ESR, set the level for each factor, and conducted experiments using the Box–Behnken design. The variables (thermal conductivity, film thickness, and capacitance) were set to three levels for each factor, and the ESR, thermal flux, and temperature characteristics were analyzed through finite element analysis. Based on the temperature results, optimized conditions for film thickness of 3.15 μm, capacitance of 390 μF, and thermal conductivity epoxy of 4.5 W/m·K were derived using Minitab, and samples were made for verification tests. A capacitor was installed in the chamber and was saturated for 2 h at 85 °C and current of 50 A rms was applied at 16 kHz frequency. The K Type sensor attached to the film surface was connected to a temperature recorder to measure the temperature change in the film over time after applying the current. The experimental results confirmed that the temperature of the genetic film with a 50 mm film width was similar to that with a 35 mm film width, and this confirmed that the set factors were similar to that of the genetic film with 35 mm film width. It was confirmed that increased film width can reduce ESR and minimize heat generation.

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“…The SH process is governed by several factors, such as capacitor's voltage and capacitance, metallization thickness and structure, polymer nature and others. They have been investigated since 1970s [10] and still are the matter of interest [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Energy characteristics of self-healing process in metallized film capacitors

et al. 2019

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Metallized film capacitors widely used in energy applications were studied. The experimental method for investigation of energy and dynamic characteristics of self-healing processes in real metal-film capacitors was developed. The commercial PET and PP MFCs of 0.22 – 1 μF capacitance and 63–250 V voltage were tested. Depending on applied voltage, 3 types of SH processes in MFC were discovered: single, repetitive, and multiple SH. Dependencies of self-healing energy on breakdown voltage were obtained. These dependencies are described by power law with the exponent n = 2.2–2.4 that significantly differs from literature data. The obtained data will be used for degradation and aging laws formulation for capacitors’ energy storage capability improvement.

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Research on the self‐healing failure characteristics and its protection methods of high‐voltage self‐healing capacitors

Cited by 5 publications

References 6 publications

Effect of thermal stress on the life of DC link capacitors for smart grid

Effect of thermal stress on the life of DC link capacitors for smart grid

Analysis of Influence Factors for Heat Generation Minimization of DC-Link Capacitor

Energy characteristics of self-healing process in metallized film capacitors

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