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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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Insulation Design Rule for a Spacer in SF_(6)/N_(2)-filled DC Gas Insulated Apparatus

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 727-735页

作者： Hongyang Zhou Guoming Ma Meng Zhang Cong Wang Youping Tu Chengrong Li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources and the Beijing Key Laboratory of High voltage and EMC North China Electric Power UniversityBeijing 102206China

A recurring challenge of a DC SF_(6)/N_(2)-filled GIS/GIL apparatus is the charge accumulation at DC *** conventional design rules and knowledge of AC spacers may not be applicable for this new type of apparatus.A novel design rule is proposed considering the effect of accumulated charge on the threshold of electric field strength being resistant to the superposed voltage.A surface charge accumulation simulation model is introduced,and the key parameters in the simulation model are *** addition,an experimental platform for a 100 kV spacer flashover test is *** flashover tests under superimposed voltage with opposing polarities are carried out,and the withstanding voltage of the spacer is ***,based on the proposed model,the threshold of the surface electric field strength(tangential component)on the DC spacer in SF_(6)/N_(2) mixed gases is *** a reliable insulation design of a DC GIS/GIL apparatus filled with 0.7 MPa SF_(6)/N_(2),the threshold of surface electric field strength on the DC spacer is 12 kV/*** insulation design rule can be referenced in the design of a high-voltage DC SF_(6)/N_(2)-filled GIS/GIL apparatus.

关键词： Charge accumulation DC spacer flashover voltage SF_(6)/N_(2) threshold of surface electric field strength

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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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Experimental research on electric insulator damaged by chemical pollutant

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Journal of Beijing Institute of Technology 2011年第2期20卷 179-182页

作者：魏继锋王树山张之暐 State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

As a main insulating device of power system, insulator can be damaged by chemical pollutant, which does threaten the electric system. An artificial pollution test system is utilized to study the damage mode for a suspension insulator, and the effects of concentration and existing state on damage efficiency of chemical pollutant are studied. Testing results show that the damage mode is flashover damage, whose efficiency increases with the decrease of creepage distance. The concentration of conductive particle of chemical pollution can effectively elevate damage efficiency, though it has a critical value. Unlike natural pollution, chemical pollutant can make insulator flashover damage whether in wet or dry condition. The damage process and relative results reveal the damage rule of insulator by chemical pollutant. Those studies put forward a new means to damage electric insulated device, and provide important reference to the protection design of electric insulator.

关键词： insulator chemical pollutant damage flashover voltage

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A Study on Damage Rules on Insulators by Conducting Sols

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Journal of Beijing Institute of Technology 2009年第4期18卷 384-387页

作者：魏继锋王树山李娜张之暐马峰 State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Computer Management Center General Hospital of Armed Police Forces

Insulating parts are easily subjected to pollution which may cause damage to the electric system. A typical disc insulator is chosen as the target to test its flashover voltage by using an artificial pollution system. This test system aims at obtaining characteristic parameters of damage for chosen conducting sola to the selected insulator. Experimental results show that thickness and electric conductivity of pollutant layer over insulators are the main parameters in damage evaluation. The flashover voltage decreases with increase of thickness and/or conductivity. These results provide a better basis on further revealing the damaging nature of conducting sol materials.

关键词： conducting sol insulator flashover voltage damage rule

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Research on Hot-line Cleaning of Artificial Contaminanted Insulator Using High Pressure Hot Water Vapor

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高压电器 2014年第4期50卷 7-11页

作者： LE Zhenchun ZHAO Wenbin YANG Guoqing FU Chenzhao JI Shengchang East China Grid Company Limited Shanghai 200002 China Shanghai Electric Power Research Institute Shanghai200437 China School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 China)

The hot-line cleaning of insulator contaminants has a great significance to prevent pollution *** technique of hot-line cleaning insulator contaminants by water vapor is proposed in this *** flashover characteristics of insulator under the procedure of cleaning by hot-line water vapor are tested to investigate the security of cleaning system in the *** kinds of insulator are chosed to carry on the *** average flashover voltage,flashover voltage gradient and withstand voltage in35 kV insulators in hot-line cleaning are *** results show that the average flashover voltage and withstand voltage of insulators used for hot-line water vapor cleaning are both larger than the operation phase voltage in 35 kV *** flashover voltage gradient is larger than usual pollution flashover voltage *** system security can be ensured when there is no overvoltage in the system,which verifies that the insulators cleaning method presented in this paper is effective and reliable.

关键词： insulator hot-line cleaning contaminant flashover voltage

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