检索结果-南通市图书馆

Impact of SF_(6) Decomposition Products on Epoxy Resin Chemical Stability and Doping-nano-Al_(2)O_(3)-based Enhancement Using the ReaxFF-MD Method

引用

CSEE Journal of Power and Energy Systems 2023年第2期9卷 779-789页

作者： Jingrui Wang Qingmin Li Heng Liu Jian Wang Yanan Chang Qi Hu manu a.haddad State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Advanced High Voltage Engineering Research Centre School of EngineeringCardiff UniversityThe ParadeCardiff CF243AAUK

Chemically active by-products formed by corona discharge in SF_(6) gas are prone to damaging the exposed epoxy resin,or even leading to an entire insulation failure of the operational GIS/GIL power *** this proposed research,reactive force field molecular dynamic simulation methodology is applied to investigate the chemical reaction kinetics of epoxy polymer under the impact of highly energetic particles(F,S,SOF,SF,OH and O)so as to explain the degradation *** all cases,SF particle-impacted epoxy resin suffers the most serious surface erosion with the lowest remnant mass of 9%and deepest damage penetration of 32.6Å,to which the S particle-caused damage showed similar *** to high reactivity of the S atom,it can merge into the epoxy molecules to promote long chain breaking,causing a six-membered ring opening and further dissociation of short carbon chains,which makes the epoxy resin molecules undergo faster spontaneous dissociation with increased *** changes of small molecular gas products,such as CO_(2),H_(2)O and CH_(2)O,as well as that of the characteristic products,such as HF,CS_(2),SO and H_(2)S,are also evaluated under the impact of different *** presented research indicates that enhancing the resistance strength of epoxy polymer against S and SF particles'corrosion is the key approach to improving chemical stability in the SF_(6) *** studies were implemented to optimize the concentration and diameter of nano-Al_(2)O_(3) doped in the *** to this paper,aluminum nanoparticle with a diameter of 1nm could significantly reduce the erosion caused by SF and S *** micro-scale mechanism lies primarily within two aspects:the nanoparticles improve the surface heat transfer efficiency as to reduce temperature rise,and also provide an effective protection area by balancing distribution and self-exposing,which finally slows down the pyrolysis process of epoxy resin,as well as the re

关键词： Al_(2)O_(3)nanoparticle corona discharge in SF_(6) epoxy resin molecular dynamics particle impact reactive force field

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surface Charge Accumulation Characteristics on DC GIL Three-post Insulators Considering the Influence of Temperature Gradient

引用

CSEE Journal of Power and Energy Systems 2023年第5期9卷 1926-1934页

作者： Qi Hu Qingmin Li Zhipeng Liu Naifan Xue Jian Wang manu haddad North China Electric Power University Beijing 102206China.He is now with State Grid Jiangxi Electric Power Co.Ltd.Nanchang 330077China the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China the Advanced HV Engineering Research Centre Cardiff UniversityThe ParadeCardiff CF243AAU.K.

Surface charge accumulation is considered to be a critical factor in flashover failure of three-post ***,surface charge accumulation characteristics on threepost insulators with complex structures and uneven electric fields are still ***,the temperature gradient field makes charge accumulation more *** this presentation,surface charge profiles of DC three-post insulators under electro-thermal coupling stress are studied by establishing a multi-degree-of-freedom movement measurement *** abdominal area of the three-post insulator accumulaftes charges of identical polarity as the DC voltage,while the leg area accumulates heteropolar *** density from the bottom of the leg to the center of the abdomen presents a trimodal distribution pattern,including two homopolar charge peaks and one heteropolar charge *** surface conductance distribution arising from the temperature gradient leads to a significant increase in amplitude and distribution range of the homopolar charge peak at the legs of *** of the temperature gradient will further magnify the homopolar charge peak at the *** DC voltage is 100 kV and conductive pole temperature is 70℃,surface charge density of the three-post insulator can reach 100μC/m^(2).Therefore,surface conductance regulation of the leg region is the key to charge regulation and insulation optimization design of DC three-post insulators.

关键词： Charge accumulation charge measurement surface charge temperature gradient three-post insulator

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

^(1)H NMR tests on damaged and undamaged XLPE and SiR samples

引用

High Voltage 2019年第3期4卷 203-209页

作者： Lydia Gkoura Taiji Wang Athanasios Anastasiou Noureddine Harid Huw Griffiths manu haddad Michalis Fardis Marina Karayianni Institute of Nanoscience&Nanotechnology National Centre for Scientific Research(NCSR)DemokritosAthensGreece School of Chemical Engineering National Technical University of AthensAthensGreece Department of Electrical and Computer Engineering Advanced Power and Energy Research CentreKhalifa UniversityAbu DhabiUnited Arab Emirates School of Engineering Advanced High Voltage Engineering Research CentreCardiff UniversityCardiffUK

Cross-linked polyethylene(XLPE)and silicone rubber(SiR)samples were subjected to a high-voltage AC stress plane-plane configuration and inclined plane test,*** voltage was applied such that discharge was observed across the surface of the XLPE test sample for several hours and for visible damage to occur on SiR samples also after several *** stressed samples together with virgin samples from the same manufactured batch were tested using nuclear magnetic resonance(NMR)***,^(1)H NMR spin-lattice(T_(1))and spin-spin(T_(2))relaxation time measurements were employed to examine potential changes in the chemical bonding of undamaged and damaged XLPE and SiR *** results show that there may be a moderate increase in the T_(1)and T_(2)values of the damaged samples in comparison with the undamaged *** raises the possibility that NMR can be a useful additional experimental tool in characterising material degradation.

关键词： XLPE rubber relaxation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

直流电压下玻璃纤维的荷电运动过程及桥接放电现象

引用

中国电机工程学报 2022年第6期42卷 2386-2395页

作者：胡琦李庆民刘智鹏刘衡梁瑞雪 manu haddad 新能源电力系统国家重点实验室(华北电力大学) 北京市昌平区102206 先进高压工程研究中心(卡迪夫大学) 英国卡迪夫CF243AA

气体绝缘全封闭组合电器/气体绝缘金属封闭输电线路(gas insulated switchgear/gas insulated metal-enclosed transmission line,GIS/GIL)在制造、运输、装配过程中容易引入绝缘纤维,是造成设备放电故障的原因之一。该文通过搭建封闭... 详细信息

气体绝缘全封闭组合电器/气体绝缘金属封闭输电线路(gas insulated switchgear/gas insulated metal-enclosed transmission line,GIS/GIL)在制造、运输、装配过程中容易引入绝缘纤维,是造成设备放电故障的原因之一。该文通过搭建封闭式平行电极板实验平台,获得玻璃纤维的启举与运动特性;进一步通过理论计算建立纤维的荷电与受力模型,研究直流电压下玻璃纤维的运动与放电特性。结果表明,玻璃纤维的临界启举电压与纤维直径的1/2次方近似呈正比关系,与纤维长度基本无关。玻璃纤维荷电启举后,在电极间往复运动中会分散成若干纤维簇,而带有不同极性电荷的纤维簇首尾相接,贯通电极,引发“桥接”现象。玻璃纤维的跳动会严重畸变纤维尖端电场,降低气隙的击穿电压,较无纤维时下降约7%~20%。当玻璃纤维出现桥接现象时,放电会沿着纤维小桥表面发生,气隙击穿电压下降约34%。所得结果阐释了直流应力下玻璃纤维的运动行为及放电规律,可为GIS/GIL设备的异物防护提供基础依据。

关键词：玻璃纤维荷电启举纤维桥接气隙击穿桥接放电

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：