T pattern fuse construction in segment metallized film capacitors based on self-healing characteristics

Li, Haoyuan; Li, Hua; Li, Zhiwei; Lin, Fuchang; Liu, De Li; Wang, Wenjuan; Wang, Bowen; Zhang, Xu

doi:10.1016/j.microrel.2015.03.006

Cited by 20 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among those, a newly emerging system is represented by electrically self-healing nanocomposite. Electrically-induced self-healing is a relatively new concept that is currently used in the design of light long-lasting nanocomposites for electronic applications and actuators [28,29,30,31,32,33]. The healing process occurs via heat generation when an electrical current passes through a conductive matrix, such as a percolated multi-walled carbon nanotubes (MWCNT) network.…”

Section: Introductionmentioning

confidence: 99%

Electrically Self-Healing Thermoset MWCNTs Composites Based on Diels-Alder and Hydrogen Bonds

Lima¹,

Orozco

Picchioni

et al. 2019

Polymers

View full text Add to dashboard Cite

In this work, we prepared electrically conductive self-healing nanocomposites. The material consists of multi-walled carbon nanotubes (MWCNT) that are dispersed into thermally reversible crosslinked polyketones. The reversible nature is based on both covalent (Diels-Alder) and non-covalent (hydrogen bonding) interactions. The design allowed for us to tune the thermomechanical properties of the system by changing the fractions of filler, and diene-dienophile and hydroxyl groups. The nanocomposites show up to 1 × 104 S/m electrical conductivity, reaching temperatures between 120 and 150 °C under 20–50 V. The self-healing effect, induced by electricity was qualitatively demonstrated as microcracks were repaired. As pointed out by electron microscopy, samples that were already healed by electricity showed a better dispersion of MWCNT within the polymer. These features point toward prolonging the service life of polymer nanocomposites, improving the product performance, making it effectively stronger and more reliable.

show abstract

Section: Introductionmentioning

confidence: 99%

Electrically Self-Healing Thermoset MWCNTs Composites Based on Diels-Alder and Hydrogen Bonds

Lima¹,

Orozco

Picchioni

et al. 2019

Polymers

View full text Add to dashboard Cite

show abstract

“…The contributing factors to self-healing, including the sheet resistance of electrodes; the interlayer air, pressure, and temperature dependence [6,7]; and other dynamic characteristics [8], were investigated to evaluate their effects. Models were built to describe the destruction [9][10][11] and the clearing mechanism [12] in the self-healing process. To evaluate the self-healing performance, measurement systems with AC supply were used to measure the properties of individual self-healing events [13] and identify self-healing [14].…”

Section: Introductionmentioning

confidence: 99%

Detection of Self-Healing Discharge in Metallized Film Capacitors Using an Ultrasonic Method

Shen

Pei

et al. 2020

Electronics

View full text Add to dashboard Cite

Benefiting from self-healing features, metallized film capacitors (MFCs) are widely employed to compensate reactive power (VAR) and thus improve the performance of AC systems. To ensure the aforementioned functions, self-healing testing is a compulsory quality inspection for every type of MFC. In 2014, the International Electrotechnical Commission (IEC) issued a standard that recommended a general and instructive test procedure based on audible noise or ultrasound signals. However, more details relevant to this high voltage (HV) test were not provided. In this paper, we focused on the ultrasonic detection technique to reveal the self-healing characteristics of two typical MFCs. By launching a series of HV tests with star and delta MFCs, the waveform features, discharge energy, and spectrum distributions were analyzed. It was observed that the partial discharge always occurs before self-healing discharge with the same spectrum features ranging above 40 kHz. To solve the entanglement of these two discharge processes, a relative amplitude difference method is proposed. Based on the experimental observations, a detection algorithm incorporated with the ultrasonic emission sensors, preamplifier, and high-speed A/D converter was developed to assist the self-healing performance test.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

T pattern fuse construction in segment metallized film capacitors based on self-healing characteristics

Cited by 20 publications

References 21 publications

Electrically Self-Healing Thermoset MWCNTs Composites Based on Diels-Alder and Hydrogen Bonds

Electrically Self-Healing Thermoset MWCNTs Composites Based on Diels-Alder and Hydrogen Bonds

Detection of Self-Healing Discharge in Metallized Film Capacitors Using an Ultrasonic Method

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

Contact Info

Product

Resources

About