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< Page ,Total 42 >
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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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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Synergic effect of adsorbed gas and charging on surface flashover SCIE
期刊论文 | 2019 , 9 | SCIENTIFIC REPORTS
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Flashover is a crucial issue in both high-voltage engineering and surface physics. It not only challenges the existing theories about its dynamic evolution, but also inhibits the clean energy revolution by limiting the accessible voltage rating of power equipment. It is of significance to elucidate the microscopic process along the interface to improve the flashover performance. In the present study, the synergic effect of adsorbed gas and surface charging is investigated, which reveals a long ignored factor for determining the flashover voltage. Depending on the relative amount of adsorbed gas, the flashover voltage varies, which exhibit different behavior from the bulk breakdown of the same gas. The amount of N-2 gas adsorbed on epoxy resin (EP) surface is much larger than that on Al2O3 ceramic surface, corresponding to the observed higher flashover voltage on EP. It is proposed that the adsorbed gas molecules not only modify the local surface charging state via their interaction with the trapped charges, but also capture free electrons due to the distortion of their electronic distribution. Both effects suppress the free path length of electrons in the gas-solid interface. This work explores another possibility to improve the surface flashover performance.

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GB/T 7714 Li, Shengtao , Huang, Yin , Min, Daomin et al. Synergic effect of adsorbed gas and charging on surface flashover [J]. | SCIENTIFIC REPORTS , 2019 , 9 .
MLA Li, Shengtao et al. "Synergic effect of adsorbed gas and charging on surface flashover" . | SCIENTIFIC REPORTS 9 (2019) .
APA Li, Shengtao , Huang, Yin , Min, Daomin , Qu, Guanghao , Niu, Huan , Li, Zhen et al. Synergic effect of adsorbed gas and charging on surface flashover . | SCIENTIFIC REPORTS , 2019 , 9 .
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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
WoS CC Cited Count: 19 SCOPUS Cited Count: 22
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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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Tailoring interfacial compatibility and electrical breakdown properties in polypropylene based composites by surface functionalized POSS SCIE
期刊论文 | 2019 , 478 , 451-458 | APPLIED SURFACE SCIENCE
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Incorporating polymeric matrix with inorganic fillers is a preferential method to improve electrical properties, while functionalization on filler surface has always been employed. In this study, two interfacial microstructures were constructed by using different functionalized polyhedral oligomeric silsesquioxane (POSS) and electrical properties of polypropylene (PP) based composites were evaluated. It is found that the electrical properties are closely related to interfacial compatibility and trap. The improved electrical breakdown strength corresponds with the composite possessing better intermolecular compatibility and deeper traps. The molecular simulation further reveals that interfacial compatibility and trap energy are affected by interaction energy and electrostatic potential between functionalized groups and PP molecular. The greater interaction energy leads to more compatible interfacial microstructure, and larger electrostatic potential leads to deeper trap energy with enhanced trapping effect, thereby restraining the charge carriers injection and migration, which synergistically leads to improved electrical breakdown strength. Contrastive interfacial traps and electrical properties of PP/POSS composites by different functionalized groups reveal the effect of interfacial compatibility. Thorough understanding of the functionalized groups and interfacial effects are beneficial for tailor-synthesizing composites with expected electrical properties.

Keyword :

Electrical breakdown Surface functionalization Interfacial compatibility Trap Interaction energy

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GB/T 7714 Li, Shengtao , Xie, Dongri , Qu, Guanghao et al. Tailoring interfacial compatibility and electrical breakdown properties in polypropylene based composites by surface functionalized POSS [J]. | APPLIED SURFACE SCIENCE , 2019 , 478 : 451-458 .
MLA Li, Shengtao et al. "Tailoring interfacial compatibility and electrical breakdown properties in polypropylene based composites by surface functionalized POSS" . | APPLIED SURFACE SCIENCE 478 (2019) : 451-458 .
APA Li, Shengtao , Xie, Dongri , Qu, Guanghao , Yang, Liuqing , Min, Daomin , Cheng, Yonghong . Tailoring interfacial compatibility and electrical breakdown properties in polypropylene based composites by surface functionalized POSS . | APPLIED SURFACE SCIENCE , 2019 , 478 , 451-458 .
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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: 2
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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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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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Research Progress and Path Analysis of Insulating Materials Used in HVDC Cable EI Scopus CSCD PKU
期刊论文 | 2018 , 44 (5) , 1399-1411 | Gaodianya Jishu/High Voltage Engineering
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Abstract :

DC power transmission has become more and more important in power grid construction, and the HVDC cable is one of the most important power devices. However, due to long-time monopoly by foreign firms, China has no enough ability in mass production of stable and reliable HVDC cable insulating materials and shielding materials at present, thus it is urgently needed to develop new cable materials with independent intellectual property rights in our country. From the aspect of technical requirements, we review the research path and future development, research progress and path analysis of HVDC cable materials. Firstly, we discuss the technical requirements including dielectric strength, electric field distribution, and space charge transport. Then, we analyze the present situation, advantages and disadvantages, trap characteristics, and the development direction of cable materials including high purity cable materials, nanocomposite cable materials, blended composite cable materials, grafting cable materials, and shielding materials. Finally, we forecast the future development. The co-relationship between DC insulation characteristics is established using the charge trap theory. The effect of charge trap behavior on DC insulation characteristics is obtained. The trap characteristics and adjusting methods for various paths are summarized. This research can provide a theoretical support for the development of new DC cable materials. © 2018, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Keyword :

Charge trap DC cables Graft modification Insulation performance Nanocomposite dielectrics Polymer blending Shielding layer

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GB/T 7714 Li, Shengtao , Wang, Shihang , Li, Jianying . Research Progress and Path Analysis of Insulating Materials Used in HVDC Cable [J]. | Gaodianya Jishu/High Voltage Engineering , 2018 , 44 (5) : 1399-1411 .
MLA Li, Shengtao et al. "Research Progress and Path Analysis of Insulating Materials Used in HVDC Cable" . | Gaodianya Jishu/High Voltage Engineering 44 . 5 (2018) : 1399-1411 .
APA Li, Shengtao , Wang, Shihang , Li, Jianying . Research Progress and Path Analysis of Insulating Materials Used in HVDC Cable . | Gaodianya Jishu/High Voltage Engineering , 2018 , 44 (5) , 1399-1411 .
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Continuous Positive Space Charge in Silicone Rubber Insulation CPCI-S CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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In the case of silicone rubber, the space charge measurement is confronted with difficulty due to the elasticity of the material. Moreover, it has been found that the space charge presents critical behaviors with respect to the hard material. This work focuses on the positive space charge characteristics of silicone rubber, and try to further understand the positive charge dynamics in silicone rubber material. The space charge profiles were measured by a typical pulsed electro-acoustic (PEA) system under room temperature. A critical positive charge injection and positive charge packet occur in the sample with a low injection field. Negative charge injection also occurs, and the negative homo charge accumulation locates near the electrode. The positive charge packet indicated an enhancement by the field and migrated faster under the high field. Non-uniform distribution of traps and deep hole traps contribute to the positive space charge dynamics in silicone rubber sample.

Keyword :

silicone rubber space charge traps positive charge packet

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GB/T 7714 Wang, Weiwang , Li, Shengtao , Xie, Dongri et al. Continuous Positive Space Charge in Silicone Rubber Insulation [C] . 2018 .
MLA Wang, Weiwang et al. "Continuous Positive Space Charge in Silicone Rubber Insulation" . (2018) .
APA Wang, Weiwang , Li, Shengtao , Xie, Dongri , Tanaka, Yasuhiro . Continuous Positive Space Charge in Silicone Rubber Insulation . (2018) .
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