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| 1 | Space Charge Suppression of Polyethylene Induced by Blending with Ethylene-butyl Acrylate Copolymer显示文摘High-voltage direct current(HVDC)power cables have been paid more attention due to the big issue concerning the main insulation materials.The residues in the industrial production process will cause space charge generation and accumulation in the materials,which has become one bottleneck to limit the development of power cables up to higher voltage levels.In this paper,the LDPE matrix was modified by three types of ethylene-butyl acrylate(EBA)copolymers(1.0 wt%)with different polarities(BA content)via melt blending to optimize the space charge behavior of the LDPE insulation.The micromorphology and structure of the blends are examined by polarized light microscope and differential scanning calorimetry.The space charge distribution is tested by the pulsed electro-acoustic method.The trap level is studied by the thermally stimulated current.The results show that EBA introduces more deep traps and decreases the shallow traps.The medium-polar EBA(16%BA content)can effectively suppress charge accumula-tion,and have the same suppressed effect on XLPE/EBA blends.This study will provide important insights into the design and development of advanced HVDC power cable applications. | Jintao Zhai Weikang Li Junwei Zha Qi Cheng Xingming Bian Zhimin Dang | 2020 | CSEE Journal of Power and Energy Systems2020，6，1： | 1 |
| 2 | On improvement of mechanical and thermo-mechanical properties of glass fabric/epoxy composites by incorporating CNT–Al 2 O 3 hybrids显示文摘 | Weikang Li Anthony Dichiara Junwei Zha Zhongqing Su Jinbo Bai | 2014 | Composites Science and Technology2014，，： | 1 |
| 3 | Mechanism analysis of improved corona-resistant characteristic in polyimide/TiO《,2》 nanahybrid films显示文摘 | ZHA JUNWEI SONG HONGTAO DANG ZHIMIN | 2008 | Appl Phys Lett2008，93，19： | 1 |
| 4 | Improving dielectric properties of BaTiO3/ferroelectric polymer composites by employing surface hydroxylated BaTiO3nanoparticles显示文摘 | ZHOU Tao ZHA Junwei CUI Ruiyao | 2011 | ACS Appl Mater Interfaces2011，3，7： | 1 |
| 5 | Preparation and dielectric properties of surface modified TiOJsilicone rubber nanocomposites 显示文摘 | Dang Zhimin Xia Yujuan Zha Junwei | 2011 | Materials Letters2011，65，： | 1 |
| 6 | Research progress on low dielectric constant modification of cellulose insulating paper for power transformers显示文摘Because of the increase in the transmission voltage levels,the demand for insulation reliability of power transformers has increasingly become critical.Cellulose insulating paper is the main insulating component of power transformers.To improve the insulation level of ultrahigh voltage transformers and reduce their weight and size,reducing the dielectric constant of oil-immersed cellulose insulating paper is highly desired.Cellulose is used to produce power-transformer insulating papers owing to its excellent electrical properties,renewability,biodegradability and abundance.The dielectric constant of a cellulose insulating paper can be effectively reduced by chemical or physical modification.This study presents an overview of the foreign and domestic research status of the use of modification technology to reduce the dielectric constant of cellulose insulating papers.All the mentioned methods are analyzed in this study.Finally,some recommendations for future modified cellulose insulating paper research and applications are proposed.This paper can provide a reference for further research on low dielectric constant cellulose insulating paper in the future. | Wenchang Wei Haiqiang Chen Junwei Zha Yiyi Zhang | 2023 | Frontiers of Chemical Science and Engineering2023，17，8： | 0 |
| 7 | Preparation and thermal-mechanical property evaluation of cellulose insulation paper with differing nano-SiC contents显示文摘Cellulose insulation paper is the main component of oil-paper insulation systems in oilimmersed transformers.However,the poor thermal conductivity and thermal stability of the cellulose can lead to thermal ageing.It is critical to address this issue by improving the performance of cellulose,nano-SiC-modified cellulose models were established by molecular simulation,while nano-SiC composite papersheets were prepared based on the simulation results,and the effects of different contents of nano-SiC on the papersheets were investigated.Macroscopically,doping nano-SiC particles can enhance the thermal stability of cellulose;compared with the unmodified papersheet,the thermal conductivity and tensile strength of the modified papersheets are increased by 44.3%and 42.8%,respectively.The degree of polymerisation of the modified papersheet decreased more slowly than that of the unmodified papersheet under accelerated thermal ageing,showing that the modified papersheet has better anti-ageing properties.Microscopically,with the addition of nano-SiC,the simulations showed that the mean square displacement of the cellulose decreases dramatically and the distribution of the free volume becomes difficult to disperse,which corresponds to the decrease in porosity in the experiments.As a result,this research provides a way for improving the thermal-mechanical properties of cellulose that has practical application significance. | Yiyi Zhang Chuqi Xu Wenchang Wei Yuke Deng Shuangxi Nie Junwei Zha | 2023 | High Voltage2023，8，3： | 0 |
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