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Improving the surface flashover performance of epoxy resin by plasma treatment:a comparison of fluorination and silicon deposition under different modes

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Plasma Science and Technology 2021年第11期23卷 84-95页

作者： Jiyuan YAN Guishu LIANG Hongliang LIAN yanze song Haoou RUAN Qijun DUAN Qing XIE State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206People's Republic of China Electrical and Electronic Engineering of North China Electric Power University Baoding 071003People's Republic of China

This work treats the Al_(2)O_(3)-ER sample surface using dielectric barrier discharge fluorination(DBDF),DBD silicon deposition(DBD-Si),atmospheric-pressure plasma jet fluorination(APPJ-F)and APPJ silicon deposition(APPJ-Si).By comparing the surface morphology,chemical components and electrical parameters,the diverse mechanisms of different plasma modification methods used to improve flashover performance are *** results show that the flashover voltage of the DBDF samples is the largest(increased by 21.2%at most),while the APPJ-F method has the worst promotion *** flashover voltage of the APPJ-Si samples decreases sharply when treatment time exceeds 180 s,but the promotion effect outperforms the DBD-Si method during a short modified *** the mechanism explanation,firstly,plasma fluorination improves the surface roughness and introduces shallow traps by etching the surface and grafting fluorine-containing groups,while plasma silicon deposition reduces the surface roughness and introduces a large number of shallow traps by coating Si ***,the reaction of the DBD method is more violent,while the homogeneity of the APPJ modification is *** characteristics influence the effects of fluorination and silicon ***,increasing the surface roughness and introducing shallow traps accelerates surface charge dissipation and inhibits flashover,but too many shallow traps greatly increase the dissipated rate and facilitate surface flashover instead.

关键词： surface charge flashover voltage dielectric barrier discharge atmospheric-pressure plasma jet plasma fluorination plasma silicon deposition

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Effect of plasma step gradient modification on surface electrical properties of epoxy resin

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Plasma Science and Technology 2021年第6期23卷 97-105页

作者： Jiyuan YAN Guishu LIANG Hongliang LIAN yanze song Chengkai PENG Yuchan KANG Qing XIE State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206People's Republic of China School of Electrical and Electronic Engineering North China Electric Power UniversityBaoding 071003People's Republic of China

In this paper,plasma fluorination is combined with plasma silicon deposition to achieve step gradient modification on an epoxy resin *** physicochemical characteristics of samples are investigated and the electrical performances *** obtained results show that compared with untreated and single treated samples,the samples treated by step gradient modification significantly improve the flashover *** to experiment and simulation,the mechanism explanations are summarized as ***,it is found that the step gradient conductivity can effectively optimize the electric field distribution of a needle-needle ***,step gradient modification suppresses the accumulation of surface charge at the triple junction and makes the charge distribution more ***,it can accelerate the surface dissipation on a high electrical field region and control the dissipation rate on a low electrical field *** these results can restrain surface discharge and increase the flashover *** step gradient modification method proposed in this paper provides a new idea for improving the surface insulation performance.

关键词： plasma epoxy resin step gradient modification flashover voltage surface charge

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Improving the surface insulation of epoxy resin by plasma etching

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Plasma Science and Technology 2021年第9期23卷 144-153页

作者： Huijuan RAN yanze song Jiyuan YAN Hongliang LIAN Yuchan KANG Chengkai PENG Qing XIE State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206People's Republic of China

Epoxy resin(EP)tends to accumulate a large amount of charge on its surface when exposed to a high-voltage DC electric field,which leads to a reduction in its insulative performance and an increase in potential safety risks in power *** suppress charge accumulation,improve the flashover voltage of the EP,and reduce the risk of gas insulated switchgear(GIS)/gas insulated transmission line(GIL)failure,we used two plasma-etching methods,i.e.,atmospheric-pressure dielectric barrier discharge(DBD)and the atmospheric-pressure plasma jet(APPJ),to modify the surface of the *** surface morphology and electrical properties of the modified materials were explored as a function of *** results show that after DBD treatment,the roughness of the sample increases by 103.9 nm,the conductivity increases by3.9×10^(-18)S,and the flashover voltage increases by 14.4%;after APPJ treatment,the roughness of the sample increases by 223.5 nm,the conductivity increases by 3.4×10^(-17)S,and the flashover voltage increases by 18%.This shows that both plasma-etching methods can improve the insulation properties of materials by improving the surface-charge *** two methods are compared with each other:the APPJ treatment method is better at improving the surface roughness and electrical properties of materials,and this flexible treatment method has greater potential in industrial applications.

关键词： plasma epoxy resin physical etching surface morphology electrical properties

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Numerical Simulation of the Flat Ribbon Wound Explosion Containment Vessels Subjected to Internal Blast Loading

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Transactions of Tianjin University 2006年第B9期12卷 223-227页

作者： song yanze LI Zhiqiang ZHAO Longmao ZHENG Jinyang Institute of Applied Mechanics Taiyuan University of Technology Taiyuan 030024 China Institute of Chemical Machinery and Equipment Zhejiang University Hangzhou 310037 China

In order to constitute engineering design methods of the flat ribbon wound explosion containment vessels, the dynamic response of such vessels subjected to internal explosion loading is simulated using LS-DYNA3D. Three winding angles, 10°, 15°and 20°, are considered. It is shown that among ribbon vessels investigated, the center displacement of outermost ribbons of the vessel with 10°winding angle is the smallest under the same blast loading. The response of vessels loaded in inner core is local. From the center of the cylindrical shell to the bottom cover, the maximum strain gradually decreases. The ribbons are subjected to tension in the length direction and compression in the width direction. Blasting shock energy concentrates on where is close to center section of blasting. For comparison, numerical simulation of a monobloc thick-walled explosion containment vessel is also investigated. It can be found that the biggest deformation of the flat ribbon wound explosion containment vessels is bigger than that of the monobloc thick-walled explosion containment vessel in the center section of blasting under the same TNT. Numerical results are approximately in agreement with experimental ones. It is proved that the ribbon vessels have the valuable properties of ' leak before burst at worst' compared with the monobloc vessels through numerical simulation.

关键词： flat ribbon wound explosion containment vessels blast loading dynamic response numerical simulation

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Enhanced surface-insulating performance of EP composites by doping plasmafluorinated ZnO nanofiller

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Plasma Science and Technology 2023年第10期25卷 37-48页

作者：段祺君宋岩泽邵帅尹国华阮浩鸥谢庆 State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 022062People's Republic of China Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power UniversityBaoding 071003People's Republic of China State Grid Changchun Power Supply Company Changchun 13000People's Republic of China

The surface flashover of epoxy resin(EP) composites is a pivotal problem in the field of highvoltage *** regulation of the interface between the filler and matrix is an effective means to suppress *** this work,nano ZnO was fluorinated and grafted using lowtemperature plasma technology,and the fluorinated filler was doped into EP to study the DC surface flashover performance of the *** results show that plasma fluorination can effectively inhibit the agglomeration by grafting –CFxgroups onto the surface of nano-ZnO *** fluorine-containing groups at the interface provide higher charge binding traps and enhance the insulation strength at the *** the same time,the interface bond cooperation caused by plasma treatment also promoted the accelerating effect of nano ZnO on charge *** two effects synergistically improve the surface flashover performance of epoxy *** the concentration of fluorinated ZnO filler is 20%,the flashover voltage has the highest increase,which is 31.52% higher than that of pure *** addition,fluorinated ZnO can effectively reduce the dielectric constant and dielectric loss of epoxy *** interface interaction mechanism was further analyzed using molecular dynamics simulation and density functional theory simulation.

关键词： plasma fluorination ZnO nanofller epoxy resin surface flashover charge trap density functional theory(Some figures may appear in colour only in the online journal)

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等离子体处理调控表面电导率提高环氧树脂绝缘性能的研究

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电工技术学报 2023年第15期38卷 3984-3998页

作者：宋岩泽梁贵书冉慧娟罗兵谢庆新能源电力系统全国重点实验室(华北电力大学) 北京102206 南方电网科学研究有限责任公司广州210000

高压直流气体绝缘输电线路中的环氧树脂盆式绝缘子长期处于单极性电场作用下,表面电荷在气固界面处发生积聚,会造成局部电场畸变,进而诱发闪络。利用等离子体对环氧树脂表面进行改性处理,能够调控表面电荷分布,提高闪络电压。该文将仿... 详细信息

高压直流气体绝缘输电线路中的环氧树脂盆式绝缘子长期处于单极性电场作用下,表面电荷在气固界面处发生积聚,会造成局部电场畸变,进而诱发闪络。利用等离子体对环氧树脂表面进行改性处理,能够调控表面电荷分布,提高闪络电压。该文将仿真计算与实验验证相结合,构建气固复合绝缘瞬态场仿真模型,利用离子输运方法构建非线性气体电导,综合考虑材料本征传导、表面传导和气体传导三种电荷积聚途径,探究了不同表面电导率参数设置下气固界面的电荷积聚情况与绝缘性能。仿真结果表明:随着表面电导率升高,三结合处积聚的电荷数量先增加后减少;三结合处的最大电场强度随着表面电导率的升高而不断下降,电场均匀程度先升高后降低;损耗功率随着表面电导率的增加而增加。利用等离子体表面处理平台对环氧树脂进行表面改性处理,并测试了改性后材料的电荷积聚特性和闪络电压,实验结果与仿真结果保持一致。利用等离子体对绝缘材料进行表面改性处理能有效调控气固界面电荷分布,抑制电场畸变,提高闪络电压,有望在直流气体绝缘输电线路中得到广泛应用。

关键词：等离子体环氧树脂气固复合绝缘仿真计算离子输运

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基于Voronoi随机模型研究多孔材料的动态特性

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机械强度 2009年第6期31卷 932-938页

作者：赵隆茂宋延泽李志强太原理工大学应用力学研究所太原030024

利用随机Voronoi技术生成2维随机模型,结合有限元分析方法系统研究多孔材料在x1—x2平面内冲击载荷作用下的动态特性。模型包含胞孔形状的不规则性和孔壁厚度的不均匀性,以及孔壁的随机不完整性。模拟结果发现,在中低速冲击时Voronoi模... 详细信息

利用随机Voronoi技术生成2维随机模型,结合有限元分析方法系统研究多孔材料在x1—x2平面内冲击载荷作用下的动态特性。模型包含胞孔形状的不规则性和孔壁厚度的不均匀性,以及孔壁的随机不完整性。模拟结果发现,在中低速冲击时Voronoi模型并不出现如规则蜂窝模型一样的"X"和"V"形的变形,而出现几条局部随机变形带;在冲击速度比较高时,局部变形带并不明显,在冲击面端附近区域出现"I"形的变形。发现平台冲击压力和胞孔形状不规则度之间具有比较复杂的关系;很小的孔边不完整性将会造成材料强度很大的"丢失";尽管组成多孔材料的母材是理想弹—塑性材料,但应用Voronoi随机模型描述的多孔材料是一应变率敏感材料。

关键词：多孔材料 Voronoi分布平台冲击压力密实化应变能

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交直流切换下环氧树脂表面电场分布特性的仿真研究

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高压电器 2022年第11期58卷 24-30页

作者：谢庆吕天舒宋岩泽段祺君吴悦夏国巍华北电力大学电力工程系河北保定071003 华北电力大学新能源电力系统国家重点实验室北京102206

高压气体绝缘封闭开关设备(gas insulated switchgear,GIS)用盆式绝缘子通常采用环氧树脂浇注而成,在直流电压下易积聚表面电荷,进而诱发沿面闪络。为了研究直流电压作用后切换交流电压情况下的环氧树脂界面电气性能,通过Comsol有限元... 详细信息

高压气体绝缘封闭开关设备(gas insulated switchgear,GIS)用盆式绝缘子通常采用环氧树脂浇注而成,在直流电压下易积聚表面电荷,进而诱发沿面闪络。为了研究直流电压作用后切换交流电压情况下的环氧树脂界面电气性能,通过Comsol有限元软件构建了环氧树脂仿真模型,分别对直流电压、交直流电场切换瞬态下的表面电荷积聚和表面电场分布情况进行了仿真计算;通过仿真对比分析了表面电导率、交流电压初始相位对交直流电压切换时刻环氧树脂界面特性的影响。该研究成果可为GIS优化设计提供参考。

关键词：交直流切换环氧树脂表面电荷电场分布

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温度对环氧树脂气——固界面电荷积聚的影响研究

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高压电器 2023年第9期59卷 60-66,89页

作者：谢子豪李敏宋岩泽吕天舒曲展玉谢军华北电力大学电力工程系河北保定071003 国网保定供电公司河北保定071001

环氧树脂在直流电场下易于积聚电荷造成局部电场畸变,进而诱发沿面闪络。文中建立了考虑离子产生、复合、迁移和扩散过程的电荷积聚模型,并在模型中计及了电导率的温度特性。研究了不同温度下气固界面电势、电场、电荷的分布及功率损耗... 详细信息

环氧树脂在直流电场下易于积聚电荷造成局部电场畸变,进而诱发沿面闪络。文中建立了考虑离子产生、复合、迁移和扩散过程的电荷积聚模型,并在模型中计及了电导率的温度特性。研究了不同温度下气固界面电势、电场、电荷的分布及功率损耗变化,分析了温度对电荷行为和电场畸变率的影响。结果表明:表面电荷密度随温度升高而增大,三结合点处电荷密度最大;温度对切向电场的影响更大,随温度升高,电荷积聚的主要方式由表面传导向体传导转变;适当升温可以提高表面电荷积聚和消散速率,但高温会使表面电荷密度和泄漏电流增大,进而加剧畸变和损耗。该研究将有助于揭示气固界面与沿面闪络的内在联系,为抑制沿面闪络提供可能方案。

关键词：温度环氧树脂电荷积聚气固界面离子输运

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微堆层绝缘子初步研制及其闪络特性研究

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高压电器 2021年第8期57卷 10-16页

作者：冉慧娟张金梁耿召阳宋岩泽王萌王珏严萍华北电力大学电力工程系河北保定071003 中国科学院电工研究所北京100190 中国科学院电力电子与电力驱动重点实验室北京100190

为满足脉冲功率设备高性能、小型化的应用需求,文中研制出以尼龙为绝缘层,铜粉导电胶和导电银胶分别为导电层的两种微堆层绝缘子,文中详细介绍了样品的制备过程和表面处理工艺。采用自主搭建的纳秒脉冲电源MPC⁃50D(上升沿50 ns,半高宽56... 详细信息

为满足脉冲功率设备高性能、小型化的应用需求,文中研制出以尼龙为绝缘层,铜粉导电胶和导电银胶分别为导电层的两种微堆层绝缘子,文中详细介绍了样品的制备过程和表面处理工艺。采用自主搭建的纳秒脉冲电源MPC⁃50D(上升沿50 ns,半高宽56 ns)对微堆层绝缘子的真空沿面闪络性能进行测试,并将测试结果与常规绝缘子闪络特性进行对比。结果表明,采用此工艺制备的微堆层绝缘子,最高绝缘强度至少提高了34%;具有相同导电层时,采用导电银胶制备的绝缘子,随着绝缘层对导电层比例的增加,绝缘强度逐渐提高;比例关系相近时,铜粉导电胶制备的微堆层绝缘子性能明显优于导电银胶制备的绝缘子;拍摄的闪络电弧表明,微堆层绝缘子的沿面放电是逐级逐层击穿。

关键词：脉冲功率导电胶微堆层绝缘子纳秒脉冲真空沿面闪络绝缘强度

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