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| 1 | Atmospheric-pressure pulsed discharges and plasmas:mechanism,characteristics and applications显示文摘Pulsed discharge plasma and its application is one of the promising directions in civilian areas of pulsed power technology.In order to promote the research and development of the theory and application technology for pulsed discharge plasma,in this paper,recent progress on the mechanism of nanosecond-pulse gas discharge and the characteristics and applications of typical pulsed plasma at the Institute of Electrical Engineering,Chinese Academy of Sciences is reviewed.Firstly,progress on mechanism of nanosecond-pulse discharge based on runaway electrons and measurement technology of runaway electrons is introduced.Then,the characteristics of three typical discharges,including direct-driven pulsed discharge,pulsed dielectric barrier discharge and pulsed plasma jet,are reviewed.Furthermore,typical plasma applications of pulsed plasma on surface modification and methane conversion are presented. | Tao Shao Ruixue Wang Cheng Zhang Ping Yan | 2018 | High Voltage2018，3，1： | 10 |
| 2 | Progress in and prospects for electrical insulating materials显示文摘The performance of electrical equipment and devices is determined to a great extent by the properties of their insulating materials.In power systems and electrical devices,insulating materials have to work in extreme circumstances that can include high temperature differences,intense radiation,and strong electric fields.Such conditions demand high-quality insulating materials with superior electrical,thermal,and mechanical properties as well as resilience to other environmental stresses.This study focuses on advances in insulating materials since the early 20th century and reviews the many developments in their properties and applications,including electric breakdown strength,thermal conductivity,temperature resistance,corona resistance,and specific energy storage in dielectrics.Some research progress on other properties is also covered,such as non-linearity and radiation resistance.Investigations into the properties of insulating materials can greatly assist in understanding their interface effects and composite structures,which in turn is helpful for discovering methods to improve the performance of electrical devices.Future directions for research are proposed to guide new investigations and support the development of even better insulating materials. | Shengtao Li Shihu Yu Yang Feng | 2016 | High Voltage2016，1，3： | 8 |
| 3 | Research and application of UHV power transmission in China显示文摘The power demand increases rapidly in China;however,the areas of huge power demands are of long distance from most areas of abundant energy resource in the country.Therefore,China put in great effort to develop ultrahigh voltage(UHV)power transmission systems to optimise its energy allocation.This includes(i)systematically developing key technologies such as overvoltage suppression,external insulation design,and electromagnetic environment control,and(ii)developing key equipment such as UHV alternative current(UHVAC)transformers,circuit breakers,and series compensated equipment,and UHV direct current(UHVDC)converter transformers,smoothing reactors,converter valves,and DC transmission control and protection systems.Eight AC UHV projects and 11 DC UHV projects have been built in China,which play an important role in the optimal allocation of energy.Plus there are one more UHVAC and three more UHVDC transmission projects in construction,while UHVAC gas-insulated lines will be applied in the UHVAC line crossover the Yangtze River and the±1100 kV UHVDC power transmission technology is in development.Here,the development and application of UHV power transmission technologies in China are described,some main challenges the UHV projects encountered are discussed,and experiences obtained from the operation of UHV systems are introduced.It is concluded that China obtained mature experience in developing,constructing,and operating UHV systems and successfully realised long-distance,large-capacity power transmission,and the UHV power transmission technology has become an important measure for energy allocation in large areas. | Yinbiao Shu Weijiang Chen | 2018 | High Voltage2018，3，1： | 8 |
| 4 | Optical sensors for power transformer monitoring:A review显示文摘Power transformers play a vital role in power transmission systems from the energy source to the consumption center.In situ diagnostics of the performance of power transformers provides a variety of benefits to ensure reliable electricity transmission.Immunity to electromagnetic interference,high sensitivity,high insulation as well as small dimensions of optical sensing make it very attractive for applications in power transformer monitoring.This paper presents a critical review of various diagnostic methods for power transformers such as partial discharge,dissolved gases,temperature and other important sensing,and optical detection.The advantages and disadvantages of different monitoring methods are carefully discussed and assessed.Finally,the existing technical barriers and future prospects of optical monitoring methods for power transformers are presented. | Guoming Ma Yuan Wang Weiqi Qin Hongyang Zhou Chao Yan Jun Jiang Yiguang Ju | 2021 | High Voltage2021，6，3： | 7 |
| 5 | Formation mechanism of streamer discharges in liquids:a review显示文摘Streamer discharges in liquids have received lots of attention with respect to their considerable applications invarious disciplines. Much effort has been spent to understand the basis of streamer ignition and propagation in dielectricliquids, but a comprehensive mechanism is far from conclusive. In this review, based on an introduction to the streamerphysics and experimentally observed characteristics in various liquids, the authors emphasise on the current status ofstreamer discharge ignition mechanisms and present their understanding for each theory. | Anbang Sun Chao Huo Jie Zhuang | 2016 | High Voltage2016，1，2： | 7 |
| 6 | Hydrogen evolution and electromigration in the corrosion of aluminium metal sheath inside high‐voltage cables显示文摘The urgent need for power transmission is the reason for leading research on the safer operation of high‐voltage cables.These high‐voltage cables are emerging as an efficient technology for underground power transmission.However,the electrochemical corrosion of aluminium(Al)metal sheaths in these cables is a common and challenging degradation process.Herein,the corrosion mechanisms and electrochemical analysis are investigated by using scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),electrochemical impedance spectroscopy(EIS)and laboratory‐designed electro-chemical characterisation techniques.In the corrosion experiments,the authors evaluated the corrosion rate by measuring the release rate of hydrogen gas and explored the different roles of sodium polyacrylate(NaPA)during the corrosion process.It is found that the complexation reactions between NaPA and Al inhibited corrosion while increased the resistance of the buffer layer.The proposed mechanisms of corrosion in this study can improve the lifespan and sustainability of high‐voltage power transmission. | Yidong Chen Kai Zhou Jiamin Kong Shakeel Akram Xiancheng Ren Xiaoshan Zhang Yuan Li Qi Zhao | 2022 | High Voltage2022，7，2： | 7 |
| 7 | Characteristics of pantograph‐catenary arc under low air pressure and strong airflow显示文摘Pantograph‐catenary arc fault is the primary factor threatening the stability of the power transmission for high‐speed railway.The motion characteristics of the pantograph‐catenary arc under low air pressure and strong airflow is significantly different from the case under atmospheric pressure.In this paper,an experimental platform of panto-graph‐catenary arc was built to investigate arc root position‐time and arc column lon-gitudinal drift height‐time characteristic curves under different air pressures and airflow velocites.Via analysing the corresponding results,it can be found that there are different arc root-arc column traction mechanisms at different stages of arc development.The arcing time and arc root stagnation time under low air pressure are significantly longer than the case under atmospheric pressure,resulting in more serious electrode ablation.The arc column longitudinal drift velocity and height are greater with the increase of airflow velocity.Two typical irregular arc motion phenomena-arc root jumping and arc reignition are observed.To clarify the internal mechanism of the above phenomenon,a magnetohydrodynamics(MHD)model of the pantograph‐catenary arc was lauched,the influence mechanism of the pantograph‐catenary arc temperature and voltage are studied,and the physical process of arc temperature oscillation is analysed.The research results provide theoretical support for arc protection in high‐altitude areas. | Zhilei Xu Guoqiang Gao Wenfu Wei Zefeng Yang Wenhan Xie Keliang Dong Yaguang Ma Yan Yang Guangning Wu | 2022 | High Voltage2022，7，2： | 7 |
| 8 | Survey of recent progress on lightning and lightning protection research显示文摘Lightning and lightning induced effects have significant influence on many aspects affecting the public, whichmakes the research of lightning and lightning protection very important. However, due to the strong randomness andcomplex discharge mechanisms of lightning, the understanding of lightning is still far from satisfactory. On the basis ofthe International Conference on Lightning Protection 2014, this study gives a review of recent progress on lightningand lightning protection research covering the following aspects: lightning locating and observation, lightning physics,lightning electromagnetic transients, and lightning protection for various systems. The goals of this study are to givereaders an overall introduction to the recent progress in lightning and lightning protection research, and to motivatethem to conduct further studies to address the unsolved problems in lightning-related research. | Rong Zeng Chijie Zhuang Xuan Zhou She Chen Zezhong Wang Zhanqing Yu Jinliang He | 2016 | High Voltage2016，1，1： | 6 |
| 9 | Development and prospect of direct‐current circuit breaker in China显示文摘The direct‐current circuit breaker(DCCB)is the most ideal choice for DC fault isolation in DC grids.Despite a late start,China's research and development on the DCCB have made outstanding achievements.This article provides a brief glance of current China's DCCB development status.It begins by sorting out the technical route according to the topology of DCCB.Then it systematically summarises both mechanical and hybrid DCCBs with focussing on the aspects of topology structure and principle,key technology and characteristics,prototype development and application.It is apparent that Chinese scientists and engineers confronted the worldwide problem of large capacity DC breaking,and put forward a comprehensive solution which consists of an innovative topology structure based on coupled negative voltage circuit,breaking throughs on the key technologies such as highly controllable and reliable fault current commutation,millisecond‐level ultra‐fast and efficient electromagnetic repulsion mechanism,high tolerance and high stability power electronic switch,low residual voltage and fast response energy consumption device,etc.The article states that the world's first set of hybrid high‐voltage(HV)DCCB,and the first set of mechanical HV DCCB have been developed.These DCCBs will soon be deployed to the DC grids which have the highest voltage levels therefore require the strongest breaking capacity.These achievements are leading the world in the development and application of DCCB.The article also discusses the overall development trends of DCCB in the areas of new topologies,key techno-logical breakthroughs and application scenarios,etc.These discussions serve as references for DCCB's future technological advancement and its ever‐expanding applications. | Weijiang Chen Rong Zeng Junjia He Yi Wu Xiaoguang Wei Taixun Fang Zhanqing Yu Zhao Yuan Yifei Wu Wandi Zhou Bing Yang Lu Qu | 2021 | High Voltage2021，6，1： | 6 |
| 10 | Surface-modification effect of MgO nanoparticles on the electrical properties of polypropylene nanocomposite显示文摘Polypropylene(PP)-based nanocomposite is a promising insulation material for recyclable high-voltage direct current(HVDC)cables,where the coupling agent plays an important role.In this study,four silane coupling agents with different alkyl chain groups(methyl,propyl,octyl,and octadecyl)were used to surface-modify magnesium oxide(MgO)nanoparticles.The surface-modification effect on the electrical properties of PP/MgO nanocomposites was investigated.The results show that surface-modified nanoparticles introduce quantities of deep traps,whose quantity increases as the alkyl chain length increases.The similar tendency also occurs on DC volume resistivity.All these nanocomposites show remarkable space charge suppression ability and improved DC breakdown strength.Among them,the nanocomposites with octyl-modified MgO show the best electrical properties,which could be attributed to the introduction of a large quantity of deep traps.The work may give a reference for the selection of coupling agents in PP-based nanocomposite insulation material for HVDC cable. | Shixun Hu Yao Zhou Chao Yuan Wei Wang Jun Hu Qi Li Jinliang He | 2020 | High Voltage2020，5，3： | 6 |
| 11 | Mechanical stress distribution and risk assessment of 110 kV GIS insulator considering Al_(2)O_(3)settlement显示文摘The growing application of gas insulated switchgear(GIS)in electric power system asks for higher reliability of epoxy(EP)insulators,thus it is important to seek effective methods to improve the operating reliability of GIS insulators.On the basis of the 110 kV GIS insulator,this study studied the aluminium oxide(Al_(2)O_(3))settlement in the curing process and the stress distribution of the horizontally laid GIS.Besides,the risk coefficient was defined to evaluate the operating reliability of insulators laid by different methods(I-V).Some conclusions are shown below:the Al_(2)O_(3)settlement in the curing process causes the insulator density to have a large variation from 2.13 to 2.32 g/cm^(3).The Al_(2)O_(3)content has a great influence on the mechanical performances of EP/Al_(2)O_(3)system.The first principle stress is localised on the upper interface between the insulator and the conductor,which is the main threat to the mechanical damage of insulator.The laying method V appears to be optimal with a pretty low risk coefficient of 31.5.In actual application,for the horizontally laid GIS,the insulator should be laid with the mould gate downward to improve its mechanical reliability. | Hucheng Liang Boxue Du Jin Li Zehua Wang | 2019 | High Voltage2019，4，1： | 5 |
| 12 | Dry reforming of methane by microsecond pulsed dielectric barrier discharge plasma:Optimizing the reactor structures显示文摘Dry reforming of CH4 process can convert greenhouse gases into high-value-added fuels and chemicals with its broad application prospects in environmental protection and renewable energy.Non-thermal plasma is considered an effective alternative method because it can activate CH4 and CO_(2)under low temperature and atmospheric pressure.This paper is aimed to optimize the plasma-assisted dry reforming of CH4 process in a unipolar microsecond pulsed coaxial dielectric barrier discharge by inves-tigating the effects of reactor structures.The results show that the conversions of re-actants and the yields of syngas were significantly affected by the reactor structures.Specifically,a multi-stage or foil external electrode and negative polar discharge could promote CH4 and CO_(2)conversions,gas product yields,and energy conversion efficiencies.For different electrodes,the maximal conversions of CH4 and CO_(2)were 20.4%and 14.1%,with an energy conversion efficiency of 4.4%under our experimental conditions.Higher conversions,yields,and energy conversion efficiencies were obtained with lower power input when applying heat insulation measures.CH4 conversion was promoted to 27.9%with a moderate energy conversion efficiency of 3.8%,but the conversion of CO_(2)was only 12%when packing materials into the reactor.The results can provide specific guidance for designing plasma or plasma-catalytic dry reforming reactor. | Shuai Zhang Yuan Gao Hao Sun Zhe Fan Tao Shao | 2022 | High Voltage2022，7，4： | 5 |
| 13 | Promising functional graded materials for compact gaseous insulated switchgears/pipelines显示文摘The electric field distributions along gas-solid interfaces determine the reliability,lifetimes and sizes of gaseous insulated switchgears/pipelines(GIS/GIL),which also affect the reliability of power systems.In this study,the characteristics of steady and transient electric field distributions were first introduced,followed by the concept of functionally graded materials(FGMs).The development histories of FGM applied in electrical engineering and the related optimisation methods were described in detail.The field regulation effect and fabrication technology of different FGM insulators were also compared.To overcome the limitations of traditional FGM insulators,the design of surface FGM(SFGM)was proposed,together with their preparation methods and electrical performance.Furthermore,the future development prospects of FGM and SFGM insulators for compact GIS/GIL were summarised. | Jin Li Hucheng Liang Yun Chen Boxue Du | 2020 | High Voltage2020，5，3： | 5 |
| 14 | Defects and failure types of solid insulation in gas‐insulated switchgear:In situ study and case analysis显示文摘The gas‐insulated switchgear(GIS)has been widely used in modern ultra‐high voltage systems.However,once it fails,its fully enclosed feature brings challenges in its diagnosis and maintenance.As the failure rate of GIS due to insulator failure has been increasing in recent years,it is necessary and important to understand the commonly existing defects presented in the insulator.First,the manufacturing process of GIS insulators is intro-duced here.The defect types commonly existing in the insulator are categorised.The failure of GIS due to insulator defects that occurred in recent years are reviewed and discussed.The content in this study is useful for engineers and scientists to study on the GIS solid insulation defects and their failure mechanisms. | Yunqi Xing Zhiwen Wang Lin Liu Yuan Xu Yang Yang Shan Liu Fusheng Zhou Shun He Chuanyang Li | 2022 | High Voltage2022，7，1： | 4 |
| 15 | Gas–solid interface charge characterisation techniques for HVDC GIS/GIL insulators显示文摘Surface charge accumulation on the spacers is one of the key issues restraining the development of HVDC GIS/GIL.The precise measurement of surface charge properties provides the basis for further study of the surface charge transport mechanism as well as the charge-induced flashover mechanism under DC voltage.In this study,the authors discuss their perspective on the current status,development needs and potential developing orientation of surface charge characterisation techniques.Different surface potential measurement methods and charge inversion algorithms are reviewed regarding the previous studies and future research needs.Drawbacks and outlooks of surface charge measurement techniques are also discussed with the background of laboratory experiment results and on-site measurements.It is hopefully that this study can serve as a useful guide reference for researchers within the same research field.More importantly,it is authors’hope that this study can inspire some novel ideas for readers into developing of more accurate and scientific interface charge characterisation techniques. | Lei Zhang Chuanjie Lin Chuanyang Li Simone Vincenzo Suraci Geng Chen Uwe Riechert Tohid Shahsavarian Masayuki Hikita Youping Tu Zhousheng Zhang Davide Fabiani Jinliang He | 2020 | High Voltage2020，5，2： | 4 |
| 16 | Enhanced voltage distribution and breakdown strength performances of oil‐paper composite insulation by adding TiO_(2)nanoparticles显示文摘Oil-paper composite insulation(OPCI)is used as the main insulation material in the converter transformer.However,the dielectric properties of insulating oil and oil‐impregnated paper are markedly mismatched under direct current(DC)voltage,resulting in an unbalanced distribution of voltage,which is considered to be a major cause of large insulation margin but frequent failures.Therefore,it is necessary to adjust the voltage distribution in OPCI to enhance its breakdown strength.In this work,surface‐treated TiO_(2) nanoparticles were employed to modify OPCI.The polarisation current tests revealed that by changing the additive amount of nano-particles,the polarisation intensities of both oil and oil‐impregnated paper could be adjusted.Based on this,a model taking relaxation polarisations into full consideration was established to analyse the voltage distribution in OPCI and predict the optimal concentration.The prepared OPCI with the concentration of 0.02 g/L has desired balanced voltage distribution due to the influence of nanoparticles on interface charge,and therefore high breakdown strengths under both DC voltage and polarity reversal voltage,which can be increased by 22.6%at most.This work puts forward a novel idea to improve insulation property of OPCI and provides a reference for broader application of nanomaterial in power equipment. | Meng Huang Yupeng Ying Baixin Liu Yuzhen Lv Bo Qi Chengrong Li | 2021 | High Voltage2021，6，1： | 4 |
| 17 | Experimental study on the partial discharge and AC breakdown properties of C_(4)F_(7)N/CO_(2)mixture显示文摘As an environmental friendly insulating medium,C_(4)F_(7)N has received extensive attention in the past two years.In this study,the partial discharge(PD)and breakdown characteristics of C_(4)F_(7)N/CO_(2)gas mixture were investigated using the gas insulation performance test platform.The influence of gas pressure and mixing ratio on the PD initial voltage(PDIV)and breakdown voltage of C_(4)F_(7)N/CO_(2)gas mixture in different electric fields was tested.It was found that the PDIV and breakdown voltage of gas mixture with 2-8%C_(4)F_(7)N in the highly non-uniform field showed a linear saturation increasing trend with the change of gas pressure and mixing ratio.The breakdown voltage of gas mixture increases linearly with gas pressure in the quasi-uniform electric field.The relative breakdown voltage of gas mixture in the highly non-uniform field under high-pressure conditions is inferior to those of low-pressure conditions.The C_(4)F_(7)N/CO_(2)gas mixture containing 2-8%C_(4)F_(7)N is sensitive to the non-uniformity of electric field.According to the PD and breakdown tests results,C_(4)F_(7)N/CO_(2)gas mixture with 2-8%C_(4)F_(7)N has the potential to replace SF6 using in gas-insulated equipment. | Yi Li Xiaoxing Zhang Ji Zhang Mingli Fu Ran Zhuo Yi Luo Dachang Chen Song Xiao | 2019 | High Voltage2019，4，1： | 4 |
| 18 | Improvement of surface flashover in vacuum显示文摘Surface flashover of insulation systems is a basic issue in the field of high voltage and electrical insulation.To improve the surface flashover performance is of great significance for the development of advanced power transmission equipment and insulation materials.This study reviews the research progress of surface flashover in vacuum regarding to effective methods to improve the surface flashover performance in vacuum,including insulation system optimisation and material modification.The former one is beneficial to reduce the electric field distortion,and the later one is able to adjust the surface trap parameters of the material through physical and chemical methods.In addition,the‘U-shaped’curve is proposed to reveal the relationship between surface flashover voltage and surface trap level,discovering the synthetic effects of surface traps on surface flashover.It is expected that the‘U-shaped’curve will become a guidance to improve surface flashover performance through adjusting trap parameters.Moreover,several suggestions are made to build unified surface flashover model which is suitable to the range from high vacuum to high pressure. | Shengtao Li | 2020 | High Voltage2020，5，2： | 4 |
| 19 | Space charge behaviors in cable insulation under a direct current‐superimposed pulsed electric field显示文摘When high‐voltage direct current(HVDC)cables are subjected to a direct current(DC)‐superimposed pulsed electric stress,the pulsed voltage applied facilitates electrical tree generation and breakdown;however,the mechanism involved remains unclear.To study the deterioration mechanism of cable insulation under a pulsed electric field,an experi-ment on the dynamic characteristics of space charge under a DC‐superimposed pulsed electric field was conducted.For this experiment,a pulsed time trigger control circuit was developed to accurately measure the change law of the space charge in cross‐linked polyethylene samples at the rising and falling edges of the pulsed electric field.The experimental results showed an unusual change law:the space charge density increases with falling voltage amplitude and decreases with rising voltage amplitude.The sudden change in the electric field breaks the balance of the forces acting on the space charge,leading to injection,extraction and migration.The energy released during these dynamic processes may destroy the microstructure of the insulation material and contributes to the growth of the electrical tree.This study provides an insight on the initiation mechanism of electrical tree in HVDC cables and proposes a strategy to suppress electrical tree initiation. | Dongxin He Tao Zhang Fansong Meng Qingquan Li Wei Wang Hongshun Liu Gilbert Teyssedre | 2021 | High Voltage2021，6，3： | 4 |
| 20 | Surface charge accumulation and preflashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage显示文摘With the increase in the voltage and capacitance of gas-insulated transmission lines(GILs),the insulation failure of GIL has attracted more and more attention.Further understanding of the partial discharge(PD)and flashover characteristics of metal particles on the insulator surface,as well as the flashover mechanism,is necessary to reduce the failure rate and improve the reliability of the equipment.In this study,an ultra-high voltage(UHV)AC insulator PD test and measurement system based on the cross-reference pulse current(PC)and ultra-high frequency(UHF)methods were established.The PD development and flashover characteristics of 5 mm-long metal particles at different positions on the surface of a UHV AC insulator,as well as the surface charge accumulation,were studied.The results show that the discharge of millimetre-scale metal particles on the insulator surface under PD test conditions is relatively low(generally lower than 2PC),and it is difficult to be detected by the conventional PC and UHF methods due to their insufficient sensitivity.Moreover,it is found that the weak PDs of the millimetrescale metal particles will result in a charge accumulation on the insulator surface under AC voltage,which eventually will lead to the insulator flashover.The PDs of the UHV AC insulator before flashover are generally small,which will make it difficult for online monitoring systems to give an effective alarm before flashover. | Li Xing Liu Weidong Xu Yuan Chen Weijiang Bi Jiangang | 2020 | High Voltage2020，5，2： | 4 |
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