High Voltage最新文献

{"title":"Effect of nucleating agents on the electrical properties of cross-linked polyethylene under tensile stress","authors":"Yunqi Xing,&nbsp;Jiahao Liu,&nbsp;Jingang Su,&nbsp;Junwei Zha,&nbsp;Guochang Li,&nbsp;Ze Guo,&nbsp;Xiaozhen Zhao,&nbsp;Mengjia Feng","doi":"10.1049/hve2.12396","DOIUrl":"10.1049/hve2.12396","url":null,"abstract":"<p>During the operation of high-voltage cables, external stress and residual stress can affect the aggregated structure of insulating materials and lead to significant deterioration in their electrical performance. To investigate the evolution characteristics of the electrical properties of cross-linked polyethylene (XLPE) under mechanical stress, this paper explains the relationship between the aggregated structure of XLPE and its electrical properties and proposes a method for improving insulation performance under mechanical stress. The results show that metallocene polyethylene used as a nucleating agent can promote crystallisation through heterogeneous nucleation and increase Young's modulus by non-uniform nucleation, increasing crystallinity and reducing interplanar spacing, resulting in more complete crystal forms and reduced damage to the aggregated structure during the tensile process. After nucleating agent modification, the XLPE crystallisation becomes more uniform, and interfacial adhesion forces increase. The weakened interface damage process between the amorphous and crystalline regions under tensile stress effectively inhibits the process of molecular chain polarisation turning and reduces trap density. The modified XLPE crystal structure shows a tendency towards densification and enhanced molecular chain interactions, which can reduce the damage to the aggregated structure under tensile stress, while the reduced free volume inside the material and the shortened average free path of carriers can weaken the damage of high-energy electrons to molecular chains, thereby inhibiting the process of electrical tree degradation. The results show that nucleating agents have great potential for maintaining the stable operation of XLPE cables under mechanical stress.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12396","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139038816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to Impact of air pressure variations on electrical vehicle motor insulation","authors":"","doi":"10.1049/hve2.12399","DOIUrl":"10.1049/hve2.12399","url":null,"abstract":"<p>Wang, P., et al.: Impact of air pressure variations on electrical vehicle motor insulation. High Voltage. 8(5), 1011–1019 (2023). https://doi.org/10.1049/hve2.12346</p><p>The authors wish to bring to the readers' attention the following error in the article by Peng Wang, Chaofan Yu, Shakeel Akram, Ziyuan Fan, Wenhuan Zhao, ‘Impact of air pressure variations on electrical vehicle motor insulation’.</p><p>We apologise for this error and any confusion that it may have caused.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12399","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138950956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on the variation of dielectric properties of oil-paper insulation for power equipment over a wide temperature range","authors":"Mingze Zhang,&nbsp;Muhe Yu,&nbsp;Wen Zhou,&nbsp;Yilin Liang,&nbsp;Shengjie Lei,&nbsp;Yunbo Shi,&nbsp;Limin Qu","doi":"10.1049/hve2.12397","DOIUrl":"10.1049/hve2.12397","url":null,"abstract":"<p>The main part of oil-immersed power equipment is oil-paper insulation. At lower ambient temperatures, transformer oil will become viscous. As a result, compared to those at room temperature or operating temperature, the frequency domain dielectric properties of oil-paper insulation at low temperatures are drastically different. For evaluating the insulation condition of electrical equipment, it is essential to accurately determine their dielectric properties. This paper described the FDS test, the DC conductivity test, and the transformer oil viscosity test, which was carried out in a laboratory environment for different ageing of oil-immersed pressboard and transformer oil at 233–373 K. The effects of temperature on the dielectric properties at the competing mechanisms of polarisation and conductivity loss were clarified based on variations of the FDS curves. Considering the viscosity change of ageing transformer oil at low temperatures, the Arrhenius and VFT viscosity equations were used to achieve a fitting calculation in the different temperature zones. Based on the molecular/ion transition model in the force field and electric field, the characterisation relationships between the dynamic viscosity, DC conductivity, and test temperature of transformer oil were established. The limitations of conventional transformer oil equivalent dielectric relaxation models over a wide temperature range were finally clarified by combining the test findings of the DC conductivity over a wide temperature range with observed and simulated calculations. This paper provides an essential theoretical reference when using the FDS test to diagnose the insulation performance of oil-immersed power equipment in extremely cold regions.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12397","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138957240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of matrix resin components on properties of the semi-conductive shielding material for high-voltage cable","authors":"Guochang Li,&nbsp;Tianyao Liu,&nbsp;Xiaolong Chen,&nbsp;Yanhui Wei,&nbsp;Chuncheng Hao,&nbsp;Shengtao Li","doi":"10.1049/hve2.12389","DOIUrl":"10.1049/hve2.12389","url":null,"abstract":"<p>The semi-conductive shielding layer is an important part of the high-voltage cable, playing a role in uniform electric field and reducing the air gap at the interface. The overall performance of the cable is affected by the semi-conductive shielding layer with different base resin composition. The matrix resins of ethylene-vinyl acetate (EVA), ethylene-ethyl acrylate (EEA) and ethylene-butyl acrylate (EBA) were used to prepare the semi-conductive shielding materials of CB/EVA, CB/EEA and CB/EBA. The influences of different matrix resins on the chemical, electrical, thermal and mechanical properties of the shielding materials were investigated. The results show that CB has the best dispersion in EBA resin and the worst dispersion in EEA resin. The temperature inflection points of CB/EVA, CB/EEA and CB/EBA shielding materials are 90°C, 100°C and 110°C, respectively, and the CB/EBA shielding material has the lowest resistivity and the weakest positive temperature coefficient effect at room temperature. The thermal conductivity of all three matrix resins is smaller than that of the shielding material, the thermal conductivity of CB/EVA and CB/EBA shielding materials show a slow increase with temperature, and the CB/EEA shielding material is the least affected by the temperature. The mechanical properties of the three matrix resins and the three shielding materials are EBA &gt; EVA &gt; EEA, among them the stress of CB/EBA shielding material is 31.0 MPa and the strain is 570%. This work has important reference significance for the selection of shielding layer matrix resin and material formulation in engineering applications.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12389","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138551151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated modelling of vacuum flashover development: Above-surface processes and breakdown threshold analyses","authors":"Guangyu Sun,&nbsp;Yitong Yao,&nbsp;Xiong Yang,&nbsp;Baohong Guo,&nbsp;Shu Zhang,&nbsp;Chao Wang,&nbsp;Ruhui Lian,&nbsp;Baipeng Song,&nbsp;Haibao Mu,&nbsp;Guanjun Zhang","doi":"10.1049/hve2.12386","DOIUrl":"10.1049/hve2.12386","url":null,"abstract":"<p>The flashover in vacuum is a rapid interfacial discharge across the insulator surface when subjected to high applied voltage. Here a theoretical model covering above-surface processes is introduced. The model calculates the flashover threshold in vacuum, with revised secondary electron emission avalanche theory and improved desorbed neutral transport model. The model serves as the first part of an integrated flashover model, aiming for consistent treatment of both above-surface and subsurface processes during the entire flashover development. The flashover threshold is obtained by combining the desorbed neutral pressure at given applied voltage and the gas breakdown criterion dictated by the Paschen's law. An analytical formula for threshold estimation containing physical parameters, and a simplified formula consisting of empirical coefficients are introduced, catering for both conceptual understanding and practical application. The derived formulae are validated by experimental data for a variety of insulator materials. The theory generalisation for non-uniform electric field distribution is further discussed.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12386","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138551154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Guest Editorial: Understanding low temperature plasmas for device reliability, modulation and application to green energy strategy","authors":"Yangyang Fu,&nbsp;Tao Shao","doi":"10.1049/hve2.12390","DOIUrl":"10.1049/hve2.12390","url":null,"abstract":"<p>Low temperature plasma stands at the forefront of green and clean energy technologies, showcasing remarkable versatility across a wide array of applications including material processing, water splitting, methane conversion, and plasma medicine. To fully harness the potential of this technology, it is imperative to deepen our understanding of the physics underlying various discharge structures.</p><p>This issue casts a spotlight on the recent strides in the field of low-temperature plasmas. We focus on key areas such as multipactor discharge, dielectric barrier discharge (DBD), plasma jet, leader, and spark. These topics are pivotal in demonstrating how low-temperature plasma technology can be leveraged in terms of device reliability, modulation and practical applications within the green energy sector.</p><p>In this collection, we have curated six papers that reflect the cutting-edge developments in this area, comprising three review articles and three original research papers. Each paper offers unique insights and contributes significantly to our understanding of low-temperature plasmas. The brief introductions to these papers, provided herein, encapsulate the essence of their research and findings.</p><p>In this comprehensive review, Peng Zhang et al. from the Michigan State University explore recent advances in multipactor discharge for both single and dual-surface geometries. The paper provides an overview of critical concepts like secondary electron emission and electron kinetics, alongside multipactor susceptibility and saturation mechanisms. It also highlights contemporary strategies for multipactor mitigation in device engineering, including modern surface coating techniques, surface conditioning, and geometric modifications. The review further covers recent developments in multipactor physics and engineering, such as novel prediction methods and the understanding of space charge effects. Finally, it discusses the potential applications of multipactor in fields such as high power microwave switches and surface cleaning.</p><p>Guangliang Chen and colleagues present a green approach to engineering high-performance electrocatalysts for water splitting through the use of low-temperature plasma. This technology, rich in reactive species, offers a unique environment for refining the physicochemical structures of catalysts via plasma milling, etching, doping and deposition. The review comprehensively summarises recent advancements in transition metal-based electrocatalysts, focusing on the enhancements made possible by DBD and radio frequency plasma technologies. These advancements not only improve plasma controllability but also pave the way for the development of cost-effective and efficient equipment. This, in turn, streamlines the plasma technology manufacturing process, allowing for precise material synthesis and modification.</p><p>Authored by Xinpei Lu and colleagues at Huazhong University of Science and Technology, this review offers","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12390","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138455854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electromagnetic anisotropic homogeneous model for eddy-current field in single-phase wound core","authors":"Lijun Zhou,&nbsp;Woyang Li,&nbsp;Yingyi Xia,&nbsp;Jiawei Chen,&nbsp;Chenqingyu Zhang,&nbsp;Xiaohu Cai,&nbsp;Lei Guo,&nbsp;Dongyang Wang","doi":"10.1049/hve2.12387","DOIUrl":"10.1049/hve2.12387","url":null,"abstract":"<p>The analysis of the eddy-current field in the wound core widely used in the field of transformer energy conservation is taken as the theme. Adopting the homogenisation idea to consider the unique geometry of the wound core and features of its equivalent multi-stage circular cross-section magnetic boundary, a homogeneous model consisting of a columnar material with continuous homogeneous electromagnetic anisotropy is established by deriving the Maxwell equations of the magnetic quasi-static field in the columnar coordinate system. Finally, a homogeneous fine element model for the eddy-current field in the wound core is established and the accuracy of the model has been verified by the test platform. The result shows that the homogeneous model can be effectively used for the analysis of the eddy-current field in the wound core, and the error of calculating the eddy-current loss under different excitation conditions is less than 6% under the premise of extremely saving the engineering calculation cost, which will help improve the operational performance of the wound core and contribute to the energy-saving goal of the high-voltage equipment.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12387","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138455855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of multi-objective optimisation method for main insulation structure configuration scheme of valve-side winding of ultra-high voltage converter transformer considering multi-field coupling","authors":"Lijun Yang,&nbsp;Zhidong Cheng,&nbsp;Li Cheng,&nbsp;Ruijin Liao","doi":"10.1049/hve2.12385","DOIUrl":"10.1049/hve2.12385","url":null,"abstract":"<p>Because DC conductivities of oil-paper materials can be easily affected by electric field and temperature, the electrical properties under electro-thermal coupling of oil-paper materials should be considered when optimising the insulation structure of valve-side winding of the converter transformer. Based on the finite element multi-physical field coupling simulation, the multi-objective optimisation of main insulation structure of valve-side winding is carried out. In view of the high time consuming of multi-physical field calculation and the actual needs of an insulation structure optimisation, the Kriging method and technique for order preference by similarity to the ideal solution (TOPSIS) method are introduced, and combines them with NSGA-II to obtain a joint algorithm that can be used for the optimisation of insulation structure of the converter transformer. By using the joint algorithm of multi-objective optimisation, the insulation structure configuration scheme of valve-side winding is optimised. It can be seen from the experiment result that, on the one hand, the joint algorithm adopted can obtain the insulation structure configuration scheme that meets the design requirements. On the other hand, when facing the configuration scheme optimisation under multi-field coupling, the computational time required by this method is only 0.15 % of that required by original genetic algorithm.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12385","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138442182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photon counting technique as a potential tool in micro-defect detection of epoxy insulation pull rod in gas-insulated switchgears","authors":"Xianhao Fan,&nbsp;Shu Niu,&nbsp;Hanhua Luo,&nbsp;Jizhong Liang,&nbsp;Fang Liu,&nbsp;Wenqiang Li,&nbsp;Weidong Liu,&nbsp;Wensheng Gao,&nbsp;Yulong Huang,&nbsp;Chuanyang Li,&nbsp;Jinliang He","doi":"10.1049/hve2.12388","DOIUrl":"10.1049/hve2.12388","url":null,"abstract":"<p>The micro-defects in epoxy-based insulation materials generate a local high electric field which results in continuous degradation, seriously endangering the insulation system of gas-insulated switchgears. A highly sensitive detection technique is reported for micro-defects of insulation pull rods based on the photon counting (PC) technique. The results demonstrated that for an epoxy-based insulation pull rod, the photons released during electroluminescence and ionisation at 2 kV, which is less than the partial discharge inception voltage, can be clearly detected. The findings presented a strong correlation between photon counts and defect severity. Discourse has been conducted to elucidate the mechanism behind defect-induced PC, employing the amplification of ionising luminescence through electric field distortion induced by micro defects and the augmentation of electroluminescence through the aggregation of trap charge. In this regard, the authors verified that PC can serve as a potential tool in the detection of micro-insulation defects, which also has huge potential in online insulation condition monitoring.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12388","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138442183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of electron beam irradiation on surface molecule and flashover voltage of epoxy composites","authors":"Mingru Li,&nbsp;Huan Niu,&nbsp;Kai Shang,&nbsp;Jianyu Lang,&nbsp;Yafang Gao,&nbsp;Bingnan Li,&nbsp;Jiuhui Zhao,&nbsp;Zhen Li,&nbsp;Yang Feng,&nbsp;Shengtao Li","doi":"10.1049/hve2.12384","DOIUrl":"10.1049/hve2.12384","url":null,"abstract":"<p>The unsatisfactory insulating properties of solid–gas interfaces seriously restrict the development of high-voltage electrical equipment and threaten their power supply stability. Electron-beam irradiation (EBI) can effectively improve the surface flashover voltage of dielectrics. However, the underlying mechanism of EBI in tailoring the surface trap and improving the flashover voltage remains unclear. In this study, the surface morphologies and chemical compositions of epoxy composites treated with EBI were investigated. In addition, the surface wetting properties, surface charge migration parameters, and surface flashover voltages were experimentally characterised. It was found that EBI aggravated the surface morphology, changed the surface chemical components, and repressed surface charge transportation. As a result, the contact angle was reduced from 103.7° to 78.43°, and the flashover voltage in SF₆ was increased from 35.26 to 38.90 kV. DFT calculations showed that the newly generated C–O–H and C=O bonds on the surface molecules after EBI formed charge centres at the molecular electrostatic potential, which enhanced the trapping effect of the surface deep trap. As a result, surface charge migration was repressed, and the surface flashover voltage was improved. This study could promote the further development of EBI on materials modification.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12384","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138442180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}