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< Page ,Total 41 >
Online Degradation of Biaxial-Orientated Polypropylene Film from HVDC Filter Capacitors SCIE
期刊论文 | 2019 , 26 (1) , 26-33 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
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Abstract :

A comparative study of biaxial-orientated polypropylene (BOPP) films extracted from one failed HVDC filter capacitor (serving for 10 years) and one fresh capacitor (spare capacitor from the same batch) is reported in this paper. Experimental results show that the 10-year online operation does not bring about molecular changes; however, molecule reorganization and recrystallization was detected using differential scanning calorimetry and dynamic mechanical analysis tests. Electrical measurements including dielectric spectra, DC conductivity measurement, DC breakdown strength and were also performed. The experimental results show that the aging process causes an increase in dielectric constant, dissipation factor, DC conductivity, and the DC breakdown strength. Thermal stimulated current measurements indicate that traps were introduced by aging and are responsible for such abnormal changes. The nano-cavitivies generated by molecule reorganization could possibly act as charge traps. Therefore, homo-charges can accumulate in the vicinity of the electrodes, leading to the degradation of long-term withstand strength but an enhancement of short-term breakdown strength.

Keyword :

aging power capacitors polypropylene films HVDC

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GB/T 7714 Cheng, Lu , Liu, Wenfeng , Liu, Xiaowei et al. Online Degradation of Biaxial-Orientated Polypropylene Film from HVDC Filter Capacitors [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2019 , 26 (1) : 26-33 .
MLA Cheng, Lu et al. "Online Degradation of Biaxial-Orientated Polypropylene Film from HVDC Filter Capacitors" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 26 . 1 (2019) : 26-33 .
APA Cheng, Lu , Liu, Wenfeng , Liu, Xiaowei , Liu, Chengming , Li, Shengtao , Xing, Zhaoliang . Online Degradation of Biaxial-Orientated Polypropylene Film from HVDC Filter Capacitors . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2019 , 26 (1) , 26-33 .
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Effect of Electron Irradiation and Operating Voltage on the Deep Dielectric Charging Characteristics of Polyimide SCIE
期刊论文 | 2019 , 66 (2) , 549-556 | IEEE TRANSACTIONS ON NUCLEAR SCIENCE
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Abstract :

Space Solar Power Station (SSPS) will operate in geosynchronous orbit. Its operating environment is rather complicated, including space plasma, energetic particles radiation, extreme temperature, and cosmic rays. To reduce power loss, SSPS has to apply high-voltage (HV) power generation and transmission technique. Deep dielectric charging will be a major problem in the design of insulation structure in SSPS. In this paper, the hopping conductivity of polyimide was studied. Hopping distance and hopping barrier height were obtained from surface potential decay analysis. Second, a deep dielectric charging model of polyimide under FLUMIC spectrum electron irradiation was established, in which the hopping conductivity parameters were applied. The effects of electron flux enhancement and operating voltage on the charging characteristics were discussed in four cases, i.e., A) suspended-HV; B) HV-suspended; C) grounded-HV; and D) HV-grounded. When the electron flux enhancement increases, the influence on case A is much larger than the other three cases. When the operating voltage increases, the influence on cases A and B is small, whereas the influence on cases C and D increases fast. Thus, when designing the SSPS, the effect of operating voltage and electron flux enhancement on the insulation system must be carefully considered.

Keyword :

hopping conductivity FLUMIC spectrum Deep dielectric charging

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GB/T 7714 Pan, Shaoming , Min, Daomin , Wang, Xiaoping et al. Effect of Electron Irradiation and Operating Voltage on the Deep Dielectric Charging Characteristics of Polyimide [J]. | IEEE TRANSACTIONS ON NUCLEAR SCIENCE , 2019 , 66 (2) : 549-556 .
MLA Pan, Shaoming et al. "Effect of Electron Irradiation and Operating Voltage on the Deep Dielectric Charging Characteristics of Polyimide" . | IEEE TRANSACTIONS ON NUCLEAR SCIENCE 66 . 2 (2019) : 549-556 .
APA Pan, Shaoming , Min, Daomin , Wang, Xiaoping , Hou, Xinbin , Wang, Li , Li, Shengtao . Effect of Electron Irradiation and Operating Voltage on the Deep Dielectric Charging Characteristics of Polyimide . | IEEE TRANSACTIONS ON NUCLEAR SCIENCE , 2019 , 66 (2) , 549-556 .
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High-k polymer nanocomposites with 1D filler for dielectric and energy storage applications EI Scopus SCIE
期刊论文 | 2019 , 100 , 187-225 | Progress in Materials Science
SCOPUS Cited Count: 1
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Abstract :

© 2018 Elsevier Ltd High-k polymer nanocomposites have received increased research interest by virtue of integrating high dielectric constant nanofiller with high breakdown strength, flexibility, and ease of processing of a matrix. With outstanding anisotropy, high-aspect-ratio nanofillers have proved to be much more efficient enhancers of the dielectric properties of nanocomposites when compared with traditional zero-dimensional (0D) fillers, leading to many dielectric and energy storage applications. This review summarizes the latest research on one-dimensional (1D) and quasi-1D fillers based high-k polymer nanocomposites with the focus on the superiority of 1D or quasi-1D high-k fillers in enhancing the dielectric properties and energy storage capability of polymer nanocomposites. Dielectric anisotropy, which plays a critical role in determining the dielectric properties and energy storage capability of polymer nanocomposites, was highlighted and the experimental methodologies for achieving anisotropic dielectric polymer nanocomposites were reviewed. The fundamental electrical parameters, such as dielectric constant, dielectric nonlinearity, dielectric loss and electrical conduction, and breakdown strength of dielectric polymer composites, are also discussed. Given the recent progress, guidelines for the future development of high-k polymer nanocomposites with dielectric and energy storage applications were proposed.

Keyword :

1D filler Dielectrics Energy storage Flexibility High-k Nanocomposites

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GB/T 7714 Huang, Xingyi , Sun, Bin , Zhu, Yingke et al. High-k polymer nanocomposites with 1D filler for dielectric and energy storage applications [J]. | Progress in Materials Science , 2019 , 100 : 187-225 .
MLA Huang, Xingyi et al. "High-k polymer nanocomposites with 1D filler for dielectric and energy storage applications" . | Progress in Materials Science 100 (2019) : 187-225 .
APA Huang, Xingyi , Sun, Bin , Zhu, Yingke , Li, Shengtao , Jiang, Pingkai . High-k polymer nanocomposites with 1D filler for dielectric and energy storage applications . | Progress in Materials Science , 2019 , 100 , 187-225 .
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A Transition of Interface Characteristics in LDPE/Al2O3 Nanocomposites by Permittivity Simulation EI SCIE Scopus
期刊论文 | 2018 , 25 (1) , 2-12 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
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This paper reveals an interface transition characteristics in LDPE/Al2O3 nanocomposites. A nonlinear variation of dielectric permittivity in nanocomposites is closely related to the interface characteristics, such as the effective thickness, the volume fraction, and the relative permittivity. The interface with a low relative permittivity is defined as a phase between nanoparticle and polymer matrix. After that, the effective permittivities of the nanocomposites are calculated by the three-phase models. The linear model which considers the interface volume by Monte Carlo calculation indicated a significant increase of interface volume fraction at low loadings, which decreased the permittivity. However, it failed to fit the permittivity at high loadings. The interface power law (IPL) model considering the interface overlap and the shape and orientation of particle is difficult to fit the measured data, particularly at low loadings. It seems that neither of the models can well fit the measured data. However, through comparison of the two models, the permittivity behaviors in low and high loading regions can be understood. The improved model with power law relation is likely useful for explaining the reduced permittivity at low loadings, while a revised IPL model could locally agree with the increased permittivity at high loadings. In light of the comparisons, it can be inferred that the reduction of epsilon(r) at low loadings is ascribed to the large interface volume (low permittivity), and the enhancement of epsilon(r) at high loadings is caused by the nanoparticles. A transition of interface characteristics is summarized, which is responsible for the change of dielectric properties.

Keyword :

interface Nanocomposites relative permittivity three phase model transition

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GB/T 7714 Wang, Weiwang , Li, Shengtao . A Transition of Interface Characteristics in LDPE/Al2O3 Nanocomposites by Permittivity Simulation [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2018 , 25 (1) : 2-12 .
MLA Wang, Weiwang et al. "A Transition of Interface Characteristics in LDPE/Al2O3 Nanocomposites by Permittivity Simulation" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 25 . 1 (2018) : 2-12 .
APA Wang, Weiwang , Li, Shengtao . A Transition of Interface Characteristics in LDPE/Al2O3 Nanocomposites by Permittivity Simulation . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2018 , 25 (1) , 2-12 .
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Trap Energy Distribution in Polymeric Insulating Materials through Surface Potential Decay Method EI SCIE Scopus
期刊论文 | 2018 , 25 (2) , 639-648 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
SCOPUS Cited Count: 1
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Abstract :

A model based on surface potential decay (SPD) measurement was developed to study the trap energy distribution of hole-type and electron -type traps in materials by considering two distinct energy levels (i.e., shallow and deep traps) and the detrapping process. An approximated Dirac function delta((E-E-m)/kT) was also introduced to obtain a consistent unit of trap density. Besides, the space charge distributions (such as uniform, linear and exponent distribution) in positively and negatively charged materials were also taken into account. In order to verify our proposed model, the different SPD curves of low density polyethylene (LDPE), LDPE/zinc oxide (ZnO) microcomposite and nanocomposite were analyzed. The results show that the proposed model is effective to obtain the trap energy distribution in materials. The SPD curves in positively and negatively charged samples show a fast decay followed by a slow decay, which is agreed with our assumption of shallow and deep traps. Two peaks are clearly observed from the trap energy distribution. The trap energy distributions of hole -type and electron -type traps in these materials are distinct from each other. This implies some essential nature of hole -type and electron-type traps (i.e., intra-chain character for hole -type traps and inter-chain character for electron-type traps). In addition, compared to LDPE and LDPE/ZnO microcompoiste, the decreasing energy level and the increasing trap density of shallow traps as well as the decreasing trap density of deep traps in LDPE/ZnO nanocomposite may be attributed to the effect of the interaction zone surrounding nanoparticles.

Keyword :

morphology LDPE nanocomposite surface potential decay trap energy distribution

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GB/T 7714 Han, Yongsen , Li, Shengtao , Min, Daomin . Trap Energy Distribution in Polymeric Insulating Materials through Surface Potential Decay Method [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2018 , 25 (2) : 639-648 .
MLA Han, Yongsen et al. "Trap Energy Distribution in Polymeric Insulating Materials through Surface Potential Decay Method" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 25 . 2 (2018) : 639-648 .
APA Han, Yongsen , Li, Shengtao , Min, Daomin . Trap Energy Distribution in Polymeric Insulating Materials through Surface Potential Decay Method . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2018 , 25 (2) , 639-648 .
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Space Charge Modulated Electrical Breakdown of Oil Impregnated Paper Insulation Subjected to AC-DC Combined Voltages EI SCIE Scopus
期刊论文 | 2018 , 11 (6) | ENERGIES
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Based on the existing acknowledgment that space charge modulates AC and DC breakdown of insulating materials, this investigation promotes the related investigation into the situations of more complex electrical stress, i.e., AC-DC combined voltages. Experimentally, the AC-DC breakdown characteristics of oil impregnated paper insulation were systematically investigated. The effects of pre-applied voltage waveform, AC component ratio, and sample thickness on AC-DC breakdown characteristics were analyzed. After that, based on an improved bipolar charge transport model, the space charge profiles and the space charge induced electric field distortion during AC-DC breakdown were numerically simulated to explain the differences in breakdown characteristics between the pre-applied AC and pre-applied DC methods under AC-DC combined voltages. It is concluded that large amounts of homo-charges are accumulated during AC-DC breakdown, which results in significantly distorted inner electric field, leading to variations of breakdown characteristics of oil impregnated paper insulation. Therefore, space charges under AC-DC combined voltages must be considered in the design of converter transformers. In addition, this investigation could provide supporting breakdown data for insulation design of converter transformers and could promote better understanding on the breakdown mechanism of insulating materials subjected to AC-DC combined voltages.

Keyword :

breakdown oil impregnated paper insulation space charge combined voltage

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GB/T 7714 Zhu, Yuanwei , Li, Shengtao , Min, Daomin et al. Space Charge Modulated Electrical Breakdown of Oil Impregnated Paper Insulation Subjected to AC-DC Combined Voltages [J]. | ENERGIES , 2018 , 11 (6) .
MLA Zhu, Yuanwei et al. "Space Charge Modulated Electrical Breakdown of Oil Impregnated Paper Insulation Subjected to AC-DC Combined Voltages" . | ENERGIES 11 . 6 (2018) .
APA Zhu, Yuanwei , Li, Shengtao , Min, Daomin , Li, Shijun , Cui, Huize , Chen, George . Space Charge Modulated Electrical Breakdown of Oil Impregnated Paper Insulation Subjected to AC-DC Combined Voltages . | ENERGIES , 2018 , 11 (6) .
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Reverse manipulation of intrinsic point defects in ZnO-based varistor ceramics through Zr-stabilized high ionic conducting beta(III)-Bi2O3 intergranular phase EI SCIE Scopus
期刊论文 | 2018 , 38 (4) , 1614-1620 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
SCOPUS Cited Count: 1
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Intrinsic point defect structure plays a crucial role in functional ceramics with a grain-grain boundary microstructure. In the present study, a novel method of reversely manipulating 'intrinsic point defects (oxygen vacancy, V-o and zinc interstitial, Zn-i) in ZnO-based varistor ceramics is proposed, which makes use of Zr-stabilized high ionic conducting beta(III)-Bi2O3 intergranular phase. It is found that Zr-doping not only modifies the grain growth by the formation of secondary Zr-rich phase, but also influences the intrinsic point defect structure via the stabilized beta(III)-Bi2O3 phase, resulting in reduced Vo density but increased Zni density. The reverse manipulation is unambiguously demonstrated by broadband dielectric spectroscopy and further confirmed by the accelerated ageing experiment. The proposed intrinsic point defect dynamics unveil an important but usually neglected function of the dopant that has little solid solubility in ZnO grains, which opens up a promising way to tailor the material property.

Keyword :

Reverse manipulation ZnO-based varistor ceramics Zr-doping Dielectric spectroscopy Intrinsic point defect structure

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GB/T 7714 He, Jinqiang , Li, Shengtao , Lin, Jiajun et al. Reverse manipulation of intrinsic point defects in ZnO-based varistor ceramics through Zr-stabilized high ionic conducting beta(III)-Bi2O3 intergranular phase [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2018 , 38 (4) : 1614-1620 .
MLA He, Jinqiang et al. "Reverse manipulation of intrinsic point defects in ZnO-based varistor ceramics through Zr-stabilized high ionic conducting beta(III)-Bi2O3 intergranular phase" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 38 . 4 (2018) : 1614-1620 .
APA He, Jinqiang , Li, Shengtao , Lin, Jiajun , Zhang, Le , Feng, Kai , Zhang, Lei et al. Reverse manipulation of intrinsic point defects in ZnO-based varistor ceramics through Zr-stabilized high ionic conducting beta(III)-Bi2O3 intergranular phase . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2018 , 38 (4) , 1614-1620 .
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Radiation Effect on the Electron Transport Properties of SiO2/Si Interface: Role of Si Dangling-Bond Defects and Oxygen Vacancy EI CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Radiation effect of electronic devices is a complex issue that attracted a lot of interest in the area of aviation industry and nuclear engineering. In order to investigate the relationship between structure damage and electrical performance of electronic devices, first-principle modeling and calculations were carried out to link SiO2/Si interfacial defect states and electron transport properties of electronic devices. We found that the oxygen vacancy (V-O) is much more easier to form than silicon vacancy (VSi) under the radiation environment. The band structure shows that two defect levels were localized inside the band gap of the SiO2/Si interface, approximately 0.19 eV and 0.25 eV below the conduction band minimum (CBM) as electronic traps, which were induced by a Si dangling bond defects. The VO as the donor defect makes the interface restructuring and chemical bond changing, which leads to the defect level crossing the Fermi level (EF). Oxygen atoms of SiO2 at the interface act as a potential well to keep electrons from tunneling. The barrier for carriers disappear after oxygen atom being moved, which will reduce the electrical gain and breakdown strength of devices. Our results gave a physical interpretation to the relationship between defects and electrical performance of electronic materials and indicated that the dangling bonds and VO at the interface are needed to be suppressed generating in order to harden the electronic devices.

Keyword :

electronic structure radiation damage dangling-bonds defects SiO2/Si first principle calculation interface oxygen vacancy

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GB/T 7714 Qu, Guanghao , Min, Daomin , Zhao, Zhonghua et al. Radiation Effect on the Electron Transport Properties of SiO2/Si Interface: Role of Si Dangling-Bond Defects and Oxygen Vacancy [C] . 2018 .
MLA Qu, Guanghao et al. "Radiation Effect on the Electron Transport Properties of SiO2/Si Interface: Role of Si Dangling-Bond Defects and Oxygen Vacancy" . (2018) .
APA Qu, Guanghao , Min, Daomin , Zhao, Zhonghua , Frechette, Michel , Li, Shengtao . Radiation Effect on the Electron Transport Properties of SiO2/Si Interface: Role of Si Dangling-Bond Defects and Oxygen Vacancy . (2018) .
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Effect of moisture absorption on dielectric properties of polypropylene-based blend EI CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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The effect of moisture absorption on the dielectric properties of polypropylene-polyolefin elastomer blend was investigated. It was found that the crystalline structure was influenced by elastomer blended. However, the blending had few effected on the melting and crystallization behavior. The DC breakdown strength, electrical conductivity, and space charge distribution were influenced by moisture content. The result in this paper contributed to the stability evaluation of new blend.

Keyword :

morphology compolymer dielectric properties moisture absorption

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GB/T 7714 Chi, Xiaohong , Liu, Wenfeng , Li, Shengtao et al. Effect of moisture absorption on dielectric properties of polypropylene-based blend [C] . 2018 .
MLA Chi, Xiaohong et al. "Effect of moisture absorption on dielectric properties of polypropylene-based blend" . (2018) .
APA Chi, Xiaohong , Liu, Wenfeng , Li, Shengtao , Zhang, Xiaohong . Effect of moisture absorption on dielectric properties of polypropylene-based blend . (2018) .
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DC and High Frequency Dielectric Breakdown Characteristics of PP/Al2O3 Nanocomposites EI CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
WoS CC Cited Count: 1
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Nanofillers Hers have significant effect on dielectric properties for polymeric materials. Pure PP and its nanocomposites films with different filler contents were fabricated to conduct dc and high frequency breakdown experiment. The result shows that, the de breakdown strength reaches the maximum value at 1wt.%, while which occurs at filler content of 7wt.% for high frequency breakdown strength E-rms. Combined with conductivity, trap, dielectric loss and thermal conductivity characteristics, it is concluded that the dc breakdown is closely related to the deep trap energy. The equivalent electric field changed by deep traps is helpful for blocking charge injection, and the enhanced trapping effect can restrict the carriers' migration and multiplication process. Under the effect of the high frequency electrical stress, heating value per unit volume is higher than that under dc voltage. The combined electrical-thermal breakdown mechanism is considered under high frequency voltage. Nanofillers change both the electrical and thermal properties. The increase of thermal conductivity weakens the local temperature rise, causing the shift of the optimal nano-doping content.

Keyword :

breakdown thermal electrical Trap high frequency conductivity

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GB/T 7714 Xie, Dongri , Huang, Yin , Min, Daomin et al. DC and High Frequency Dielectric Breakdown Characteristics of PP/Al2O3 Nanocomposites [C] . 2018 .
MLA Xie, Dongri et al. "DC and High Frequency Dielectric Breakdown Characteristics of PP/Al2O3 Nanocomposites" . (2018) .
APA Xie, Dongri , Huang, Yin , Min, Daomin , Wang, Weiwang , Li, Shengtao . DC and High Frequency Dielectric Breakdown Characteristics of PP/Al2O3 Nanocomposites . (2018) .
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