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| 1 | 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 |
| 2 | 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 |
| 3 | Effect of chemical corrosion on charge transport behaviour in epoxy/Al_(2)O_(3)nanocomposite irradiated by gamma ray显示文摘Chemical corrosion and gamma‐ray irradiation appeared with the loss of coolant accident may seriously threaten the safe operation of a nuclear power plant,where epoxy resin(ER)‐based materials are widely used.It is urgent to study the effects of the corrosion and the irradiation on the electrical performance in an ER‐based nanocomposite.In this work,ER/Al_(2)O_(3)nanocomposite samples with 0,1,3,5‐wt%nano Al2O3 filler content were prepared at the thickness of 2 mm,and the total gamma irradiation dose was 0,500,and 1000 kGy.The samples were chemically corroded in a boric acid solution(pH=4.7)and a trisodium phosphate alkaline solution(pH=11)at 60℃and 100℃for 48 h.Charge transport behaviour in the samples was derived from the surface potential decay method.In addition,the sample structures were characterised to analyse the corrosion mechanism in the solutions.The results indicated that the depth and the density of the trap showed a temperature‐dependent manner associated with the corrosion.With the addition of appropriate content of the filler,the trap centre was deepened and the carrier mobility was limited even after the corrosion.It is found that the appearance of hydroxyl and carboxyl groups during corrosion,the interaction between the nanoparticle and the matrix and the crosslinking reaction caused by the irradiation are responsible for the variation in charge transport behaviour. | Yu Gao Jing Li Bangbang Xu Binyuan Ye Boxue Du | 2022 | High Voltage2022，7，1： | 4 |
| 4 | Nonlinear Response Analysis for Insulation Diagnosis of Water-tree Aged 10 kV XLPE Cable Using Pulse Voltage显示文摘The diagnosis of water trees of cable insulation is of great importance as the water-treeing is a primary cause of aging breakdown for the middle voltage cables. In this paper, it is described how the water-tree-aged 10 kV XLPE cables were diagnosed. The cables were subjected to electrical stress of 5.9 kV/mm and a thermal load cycle in a curved water-filled tube for 3, 6 and 12 months of aging in accor- dance with the accelerated water-tree test method. The aged cables were used as the samples for water-tree diagnosis. First, the water-tree degraded cable, was charged by a DC voltage, and then the cable was grounded while a pulse voltage was applied to it for releasing the space charge trapped in the water trees. The amount of the space charge, which corresponds to the deterioration degree of the water trees, was calculated. The effects of DC voltage amplitude, pulse voltage repetition rate and aging conditions on the amount of the space charge were studied. Obtained results show that the amount of the space charge has a positive correlation with the applied DC voltage and the ag- ing time of the cables, and that a peak value of space charge appears with the increase of the pulse voltage repetition rate. An optimum pulse voltage repetition rate under which the space charge can be released rapidly is obtained. Furthermore, the releasing mechanism of space charge by the pulse voltage is discussed. Accumulated results show that the presented method has a high resolution for the diagnosis of water tree degradation degree and is expected to be applied in practice in future. | DU Boxue WANG Li | 2013 | 高电压技术2013，39，8： | 3 |
| 5 | Electrical tree degradation in high-voltage cable insulation:progress and challenges显示文摘High-voltage direct current(HVDC)and high-voltage alternating current(HVAC)cables are the most important equipment for high-voltage,large-capacity and long-distance power transmission.Electrical tree is a pre-breakdown phenomenon leading to failure of insulation materials,and it is the major issue that threatens the safe and stable operation of HVDC and HVAC cable systems.This study summarises and analyses the achievements in the research of electrical tree for HVDC and HVAC cables.The initiation mechanisms of the electrical tree,including Maxwell electro-mechanical stress,charge injection-extraction,charge trapping and electroluminescence theories,are elaborated for fully understanding the electrical degradation process in insulation materials.Then,the influences of the high electric field,high temperature and mechanical stress on electrical tree behaviours are discussed,and the relationship between charge transport and the electrical tree is analysed and illustrated.The suppression methods of the electrical tree are put forward by introducing inorganic and organic additives into insulation materials,and the suppression mechanisms are presented from the viewpoints of the structure-property and microscale-macroscale relationships.Recently,the electrical tree research studies are focused on the high-precision of initiation models,high-dependence of multi-physical fields and high-efficiency of suppression methods.The achievements provide theoretical support for improving the electrical performance of insulation materials,while it is a practical problem to explore their application feasibility in HVDC and HVAC cable. | Jingang Su Boxue Du Jin Li Zhonglei Li | 2020 | High Voltage2020，5，4： | 3 |
| 6 | Evaluation of high-voltage AC cable grounding systems based on the real-time monitoring and theoretical calculation of grounding currents显示文摘For high-voltage(HV)AC cable transmission systems,the metal sheaths of three separate single-core cables are cross-bonded at each end of the cable section,to suppress the induced voltages in sheaths.The status of HV cable grounding systems is,therefore,an important consideration for power utilities.This study presents the status evaluations of 93 cable grounding systems in Beijing,obtained using the standards established by State Grid Corporation of China.As a result,13 of these systems were classified as abnormal or defective.Additionally,a theoretical calculation of grounding currents was proposed and these 13 systems are re-evaluated by comparing the calculated and measured values of certain parameters.Based on this work,the authors propose a modified evaluation standards.It is indicated that the absolute value of grounding current(|I|)during a given 24-hr period has no relationship with the status of grounding system,and the ratio of grounding current to load current(K)at the time of maximum load current could be used as a status indicator instead of K at some other time,in order to avoid possible incorrect evaluations due to light load conditions. | Zhonglei Li Boxue Du Wang Li | 2018 | High Voltage2018，3，1： | 3 |
| 7 | Effects of ZnO magnetron sputtering on surface charge and flashover voltage of oilimpregnated paper显示文摘With the aim of exploring an alternative method of nano-doping in cellulose paper and improving flashover strength of oil-impregnated paper,radio frequency(RF)magnetron sputtering method is introduced into the structural modification of insulating paper for converter transformers.In this experiment,insulating paper was treated with ZnO sputtering for 0,7.5,15 and 30 min,respectively.The surface morphology of dry paper was observed with a scanning electron microscope.The bonding mode of sputtered ZnO particles with cellulose matrix was investigated via attenuated total reflection infrared(ATR-IR)spectroscopy and mechanical property of the sputtered samples were studied.Surface and volume conductivities of the oilimpregnated sputtered paper were measured.Moreover,the charge dissipation characteristics of sputtered insulating paper was investigated by means of surface potential decay.In addition,trap distribution and carrier mobility of specimen were further obtained.Finally,the DC flashover strength were tested.The results showed that ZnO magnetron sputtering had a distinct influence on the structure of the insulating paper,resulting in the formation of hydrogen bond and chemical bond and an increase of the surface and volume conductivities.ZnO sputtering was found to decrease the initial potential and accelerate charge decay.Moreover,appropriate sputtering enhanced the surface flashover strength. | Boxue Du Jinpeng Jiang Jin Li Wenbo Zhu | 2019 | High Voltage2019，4，4： | 1 |
| 8 | Effects of magnetic field on surface dielectric breakdown of contaminated print wiring board显示文摘 | Du Boxue Kobayashi S | 2003 | IEEJ Trans on FM2003，123，6： | 1 |
| 9 | Discharge energy and dc tracking resistance of organic insulating materials显示文摘 | Du Boxue | 2001 | IEEE Trans on Dielectrics and Electrical Insulation2001，6，8： | 1 |
| 10 | Effects of relative angle between magnetic field and electric field on insulation breakdown of contaminated printed wring board显示文摘 | Du Boxue | 2000 | Jour Japan Institute of Electronic Packaging2000，3，2： | 1 |
| 11 | Recurrent plot analysis of leakage current for monitoring outdoor insulator performance 显示文摘 | DU Boxue LIU Yong LIU H J | 2009 | IEEE Transactions on Dielectrics and Electrical Insulation2009，16，1： | 1 |
| 12 | Pattern analysis on di- electric breakdown characteristics of biodegradable polyethylene film under nonuniform electric field显示文摘 | Liu Yong Du Boxue Du Dongming | 2013 | Inter- national Transactions on Electrical Energy Systems2013，23，1： | 1 |
| 13 | Recurrent plot analysis of leakage current on flashover performance of rime-iced compositeinsulator显示文摘 | Liu Yong Du Boxue | 2010 | IEEE Trans on Dielectrics and Electrical In- sulation2010，17，2： | 1 |
| 14 | Temperature‐dependent electric field distribution in±800 kV valve‐side bushing insulation for a converter transformer显示文摘The electric field distribution is determined for the design and long‐term performance of bushing yet gets complicated when coupled with temperature due to the highly tem-perature‐dependent conductivity of insulation.An electrothermal coupling model is established based on a�800 kV converter transformer valve‐side bushing.The measured temperature‐dependent conductivity of insulation is adopted and fitted.The electric field distribution inside a condenser core under the influence of temperature was investigated,and the related mechanism was analysed,considering the different voltage forms,loading currents,and changeable ambient conditions.The temperature gradient within the condenser core is verified,and the electric field migration is observed.It is indicated that the electric field strength shows a strong dependence on temperature and increases along the radial direction.The maximum field strength appears at the outmost shield layer under the operating voltage and the load current 4500 A,which is higher than that under the DC long‐term withstand voltage of 1455 kV without thermal stress.The increased load current,decreased oil temperature,and enhanced valve hall temperature will lead to more serious electric field distortion,and unacceptable dielectric stress may occur.More attention should be paid to the design and operation of bushing for DC applications. | Boxue Du Hanlei Sun Jinpeng Jiang Xiaoxiao Kong Wei Yang | 2021 | High Voltage2021，6，1： | 1 |
| 15 | Dynamic formation mechanism of water droplet and induced surface discharges on silicone rubber composites显示文摘Wettability has become one of the most important factors influencing power equipment insulation system in coastal power grid,which can seriously threaten the safety of power grid.This paper aimed at numerical simulation and experimental investigation on dynamic formation mechanism of water droplet and induced surface discharges on silicone rubber composites under different AC voltages,considering the factors of surface tension and droplet volume.Obtained results reveal that the spreading coefficient increases with increasing the electric field intensity from 1 to 5 kV/cm and with increasing the droplet volume from 10 to 50μL.The spreading coefficient shows a decreasing tendency when the surface tension increases from 29.3 to 61.0 mN/m.Moreover,the maximum of surface electric field shows an increasing tendency under the condition of increasing both the droplet volume and the surface tension.On the basis of the physical model of droplet deformation,the electric field force and the surface tension play a significant role in the process of droplet deformation.Meanwhile,the experimental results are consistent with the simulation analysis,reflecting that the droplet deformation and the induced surface discharges mainly depend on two parameters:the droplet volume and the magnitude of applied voltage. | Yong Liu Yafeng Wu Boxue Du | 2019 | High Voltage2019，4，1： | 1 |
| 16 | Electric field control by permittivity functionally graded and superficially non-linear conductivity materials for DC-GIS spacer显示文摘This paper offers a simulation study on the application of a novel approach to control the electric field around a basin-type spacer by combining permittivity functionally graded materials(ε-FGM)and superficially non-linear conductivity materials(SNCM),namely multi-dimensional functional materials(MDFM).The permittivity distribution of theε-FGM spacer is designed by the iteration optimization algorithm,and the epoxy/SiC composites with 30 and 60 phr doping contents are assigned as the coating materials of two SNCM spacers,namely SNCM30 and SNCM60.The MDFM spacer combinesε-FGM in its bulk and SNCM60 on its surface.The electric field regulation effect of each functional spacer is investigated under variable conditions,that is,DC steady state(DC-steady),DC turn-on state(DC-on),DC polarity reversal(DC-PR),and DC superimposed with switching impulse voltage(DC-SI).Results show that the applicability ofε-FGM and SNCM is limited to transient and stationary conditions,respectively.The MDFM spacer combines the advantages ofε-FGM and SNCM for adaptively relaxing the electric field under all the above conditions.It is hoped that this research will be beneficial to the development and application of spacers for the direct current gas-insulated switchgear(DC-GIS). | Boxue Du Jianan Dong Hucheng Liang | 2022 | High Voltage2022，7，5： | 1 |
| 17 | Molecule diffusion behaviours of waterproof sealants into silicone rubber insulation for submarine cable joint based on molecular dynamics simulations显示文摘The repair joints of high-voltage cables play a significant role in the urgent cable main-tenance,by recovering cable conductor,insulation,shielding layer and waterproof layer especially for submarine cables.However,the molecule diffusion and permeation pro-cesses from waterproof sealant into the cable joint insulation occur,leading to the insulation ageing and deterioration.In this article,the molecule diffusion behaviours of six typical molecules from the asphalt-based and polyurethane-based waterproof sealants into silicone rubber insulation are investigated.The results show that the order of diffusion coefficients is as follows,phenanthrene>fluoranthene>pyrene>benzo[k]fluoranthene>indeno[1,2,3-cd]pyrene>polyurethane(PU).The relative molecular mass and binding energy are pivotal factors affecting the diffusion behaviour,while there is a linear relationship between the logarithm of the diffusion coefficient and the ratio of binding energy to relative molecular mass.Besides,the rising ambient temperature in-creases the fraction of free volume of silicone rubber and decreases the binding energy,thus resulting in a higher diffusion coefficient and an enhanced permeation process of the asphalt-based sealant.In summary,the PU-based waterproof sealant,with a much lower permeability than the asphalt-based material,has a potential application in the waterproof layer for high-voltage submarine cable repair joints. | Zhenpeng Zhang Heyu Wang Zhonglei Li Jiankang Zhao Shaohua Wang Wenlin Pan Wenjie Li Te Li Boxue Du | 2021 | High Voltage2021，6，2： | 1 |
| 18 | Frequency distribution of leakage cur-rent on silicone rubber insulator in salt-fog environments显示文摘 | DU Boxue LIU Yong | 2009 | IEEE Transactions on Power Delivery2009，24，3： | 1 |
| 19 | Impact of the Foucault Current and Its Vibration Noise Reduction on Bracket Features for AMDT显示文摘This manuscript explores the influences of the Foucault current on bracket vibration. Noise measurements are obtained in conditions that the coils are enclosed by the bracket, and exposed to the air for confirming the impact of Foucault current on bracket vibration. The outcomes illustrate that the bracket increases the primary noise to 21 d B. Throughout investigational modal computation, ordinary frequencies of the coils stay afar from the exciting frequency of 100 Hz but the ordinary frequency 72.924 Hz of the bracket stands near to 100 Hz, which similarly explicates the upsurge of the noise level. To do the computations on bracket vibrations instigated by the Foucault current, a finite-element method(FEM) has been utilized for evaluating the eddy current density, electromagnetic forces(EMF), coupled with bracket response in frequency domain. The calculations displayed a proper approval by mean of theoretic investigations, and the simulations analyzed effectively the bracket vibration produced by Eddy current, and the electromagnetic force(EMF). Referring to the simulation, the primary vibration characteristics, and noise level, the method by applying weights(stress) on the top bracket of transformer is proposed to lessen the vibration amplitude, and noise level. To indorse the utility, and application of the suggested technique, the experiment results are obtained, analyzed, and compared with those of simulations, primary vibration characteristics, and noise level. | Kammeugue Noubissi Romaric Daosheng Liu Boxue Du | 2023 | CES Transactions on Electrical Machines and Systems2023，7，3： | 0 |
| 20 | Charge transport behavior in gamma‐ray irradiated poly(ethylene terephthalate)estimated by surface potential decay显示文摘This study reports on the variation in charge transport behaviour of poly(ethylene terephthalate)(PET)caused by gamma‐ray irradiation estimated by means of surface potential decay(SPD)measurement.The 100μm‐thick PET specimens were exposed to 60Co gamma rays to a maximum total dose of 1000 kGy.The SPD test was carried out to obtain charge transport related parameters via various models,and the effect of gamma‐ray on the transport behaviour was examined.Furthermore,Fourier trans-form infrared spectrum,gel content,ultraviolet‐visible spectroscopy,X‐ray photo-electron spectroscopy,differential scanning calorimetry and polarized optical microscope were employed to characterize the change in material structure induced by the irradiation.The test results indicated that with the growth in the total dose,the deep trap centre was basically unchanged,whereas the shallow trap centre became shallower.In addition,the trap density tended to decrease.The carrier mobility in PET increased with the total dose,and the charge transport manner conformed well to the hopping model.It is suggested that the formation of oxygen‐based groups from the irradiation induced oxidation reaction tends to encourage the charge transport,while the decrease of amorphous region gives rise to the reduction in trap density. | Yu Gao Nan Li Jing Li Boxue Du Ziyang Liu | 2021 | High Voltage2021，6，3： | 0 |
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