High Voltage最新文献_第3页

Dynamic Behaviour of Bubbles in Oil Under Electrothermal Ageing 电热老化下油中气泡的动态行为

IF 5.7 2区工程技术

High Voltage Pub Date : 2026-08-31 Epub Date: 2026-03-30 DOI: 10.1049/hve2.70161

Hongbin Wu, Zhaoyang Kang, Ze Li, Zhongyu Zhao, Shuqi Li, Fuqiang Ren, Hongshun Liu, Qingquan Li

{"title":"Dynamic Behaviour of Bubbles in Oil Under Electrothermal Ageing","authors":"Hongbin Wu, Zhaoyang Kang, Ze Li, Zhongyu Zhao, Shuqi Li, Fuqiang Ren, Hongshun Liu, Qingquan Li","doi":"10.1049/hve2.70161","DOIUrl":"10.1049/hve2.70161","url":null,"abstract":"During long-term operation of converter transformers, the internal oil–pressboard insulation undergoes irreversible degradation. Partial discharge in the weakened insulation will cause the formation of a large number of bubbles in the insulating oil. The dynamic behaviour of bubbles in the strong electric field region will threaten the safe operation of the transformer. To clarify the dynamic behaviour of bubbles in oil under electrothermal ageing, the migration trajectories and deformation process of bubbles in oil under partial discharge at different ageing stages are investigated experimentally, and the influence of the initial bubble radius on migration trajectory, velocity and morphological changes are examined through numerical simulation. The experimental results indicate that as the ageing time increases, the influence of the kinematic viscosity of the insulating oil on bubble migration increases, and the influence of the electric field strength distribution on bubble migration increases and then decreases. It also becomes more difficult for bubbles to return to a spherical shape. The simulation results indicate that as the initial bubble radius increases, bubbles move more easily away from the strong electric field region and more easily enter the rising stage. The maximum degree of longitudinal stretching of bubbles increases.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"975-986"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70161","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147536633","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}

引用次数: 0

Threshold Currents of Vacuum Arcs With Tungsten and Copper Cathodes 钨铜阴极真空电弧的阈值电流

IF 5.7 2区工程技术

High Voltage Pub Date : 2026-08-31 Epub Date: 2026-01-04 DOI: 10.1049/hve2.70151

P. S. Mikhailov, I. L. Muzyukin, I. V. Uimanov, D. L. Shmelev, S. A. Barengolts

引用次数: 0

Thermal Stability of Plasma-Assisted Film Deposition for Insulation Modification: In View of Hydrophobicity and Flashover Performances 基于疏水性和闪络性能的等离子体辅助膜沉积绝缘改性热稳定性研究

IF 5.7 2区工程技术

High Voltage Pub Date : 2026-08-31 Epub Date: 2026-08-14 DOI: 10.1049/hve2.70237

Xi Zhu, Liyan Wang, Xiuhan Guan, Tianhe Lu, Zhangliang Shen, Jiarui Bao, Hongtu Cheng, Zhi Fang

{"title":"Thermal Stability of Plasma-Assisted Film Deposition for Insulation Modification: In View of Hydrophobicity and Flashover Performances","authors":"Xi Zhu, Liyan Wang, Xiuhan Guan, Tianhe Lu, Zhangliang Shen, Jiarui Bao, Hongtu Cheng, Zhi Fang","doi":"10.1049/hve2.70237","DOIUrl":"https://doi.org/10.1049/hve2.70237","url":null,"abstract":"Polymer insulation exposed to natural environment inevitably face challenges from material ageing and surface insulating degradation. Surface treatment is an effective method to improve material performance, but traditional processing methods such as room temperature vulcanised silicone rubber (RTV) coating, are subjected to coating degradation after long time operation. Herein, we fabricated a stable cross-linked Si-containing (–SiO4) film on polymethyl methacrylate (PMMA) insulation via eco-friendly atmospheric pressure plasma techniques, and verified its thermal stability performance. By addition of hexamethyldisiloxane (HMDSO) and fluorescent agent in plasma, fragmenting–crosslinking of HMDSO as well as surface functionalising by plasma-enabled reactions lead to the fabrication of fluorescent Si-containing film. Accelerating ageing test demonstrates that the plasma-modified PMMA remains steady hydrophobic performance after ageing. Although the surface insulating performance decreases with the ageing, the aged material still remains the higher flashover voltage compared with the original. It reveals that the Si-containing film could convert thermal oxygen reactions into itself crosslinking process with the shift of –SiO2 to –SiO4 groups, which eventually leads to the variation of material surface performance. Overall, the plasma-assisted Si-containing film for surface modification has satisfactory thermal stability, which offers a new avenue for insulation enhancement and service life prolonging.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"889-898"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70237","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859957","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}

引用次数: 0

Pixel-Level Inversion Assessment for Ageing of Composite Insulator Sheds of Power System 电力系统复合绝缘子棚老化的像素级反演评估

IF 5.7 2区工程技术

High Voltage Pub Date : 2026-08-31 Epub Date: 2026-08-19 DOI: 10.1049/hve2.70236

Yang Liu, Yujun Guo, Yihan Fan, Chenguang Yang, Enming Bai, Song Xiao, Xueqin Zhang, Guoqiang Gao, Guangning Wu

{"title":"Pixel-Level Inversion Assessment for Ageing of Composite Insulator Sheds of Power System","authors":"Yang Liu, Yujun Guo, Yihan Fan, Chenguang Yang, Enming Bai, Song Xiao, Xueqin Zhang, Guoqiang Gao, Guangning Wu","doi":"10.1049/hve2.70236","DOIUrl":"https://doi.org/10.1049/hve2.70236","url":null,"abstract":"The polymeric materials used in insulator sheds are prone to ageing under different environmental conditions, which can lead to flashovers and grid outages. The ageing process in composite insulators primarily involves changes in the microscopic properties of the materials. Ageing levels were determined based on the hydrophobicity of artificially accelerated ageing samples, and spectral lines ranging from 400 to 1000 nm were analysed at various ageing stages. This study employed sample entropy as the objective function and used Beluga whale optimization to determine the optimal number of decomposition layers, K, and the penalty parameter, α, for the variational mode decomposition, thereby achieving effective denoising in the spectral domain. The channel attention mechanism was able to better extract ageing status information from the spectral bands. By employing a long short-term memory network with an adaptively weighted squeeze-and-excitation network, a high global accuracy of 95.48% was attained, outperforming traditional classification models. This approach successfully addressed the challenge of low evaluation accuracy resulting from the high spectral line similarity observed in severely aged levels. The trained model enabled the visualisation of ageing distribution at the pixel level within the sheds' structure, overcoming difficulties associated with detecting microscopic ageing states and providing comprehensive assessments of composite insulators. This research study significantly contributes to ensuring the safe operation of power grids and offers valuable insights for guiding the material selection and design of composite insulators in diverse environments, thereby presenting promising applications in various fields of electrical equipment condition monitoring.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"1021-1031"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70236","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148860025","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}

引用次数: 0

Mechanical Properties and Quantitative Analytical Modelling of Micro/Nanocellulose Co-Modified Insulating Papers With Different Aspect Ratios 不同纵横比微/纳米纤维素共改性绝缘纸的力学性能及定量分析模型

IF 5.7 2区工程技术

High Voltage Pub Date : 2026-08-31 Epub Date: 2026-04-20 DOI: 10.1049/hve2.70184

Siyu Wang, Daning Zhang, Wenrui Tian, Xinnan Zhai, Dingqian Yang, Guanjun Zhang

{"title":"Mechanical Properties and Quantitative Analytical Modelling of Micro/Nanocellulose Co-Modified Insulating Papers With Different Aspect Ratios","authors":"Siyu Wang, Daning Zhang, Wenrui Tian, Xinnan Zhai, Dingqian Yang, Guanjun Zhang","doi":"10.1049/hve2.70184","DOIUrl":"10.1049/hve2.70184","url":null,"abstract":"The incorporation of nanocellulose-doped insulating paper into the material composition of a given structure has been demonstrated to enhance the material’s mechanical properties and retard the development of cracks. However, the effects of different length-to-diameter ratios of nanocellulose are different. In this paper, multi-scale doped modified insulating paper with different mass fractions were prepared. The modification mechanism of multi-scale doped modified insulating paper and its advantages were analysed in terms of the dynamic reorganisation of hydrogen bonding during the fracture process of the insulating paper, fibre bridging during the development of microcracks, and the interfacial and agglomeration effects of microfibrillated/nanocellulose, modified paper retains insulating properties while enhancing mechanical properties. At the same time, based on the Halpin–Tsai model, introducing the fibre orientation factor and incorporating the calculation of agglomerate and interfacial phases was also undertaken. This approach enabled the prediction of Young’s modulus for multi-scale doping system and single-scale doped modified insulating paper, and the optimal ratio of multi-scale mixed fibre doping is derived based on the modified mechanical model. The experimental findings demonstrate that the modified mechanical model exhibits numerical stability and universality in terms of Young’s modulus prediction error, with a maximum error of 6.07% and a minimum error of 0.7% across different batches of insulating paper. The multi-scale doped modified insulating paper and the mechanical quantitative model hold significant potential in enhancing the mechanical properties of insulating paper and its prediction.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"953-964"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70184","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733668","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}

引用次数: 0

Study on Impurity Particle Detection in Transformer Oil Based on Microflow Imaging Method 基于微流成像方法的变压器油杂质颗粒检测研究

IF 5.7 2区工程技术

High Voltage Pub Date : 2026-08-31 Epub Date: 2026-04-15 DOI: 10.1049/hve2.70167

Chen Chen, Lijun Yang, Wu Zhao, Zhengyu Chen, Xinxi Yu, Yong Li, Ruijin Liao

{"title":"Study on Impurity Particle Detection in Transformer Oil Based on Microflow Imaging Method","authors":"Chen Chen, Lijun Yang, Wu Zhao, Zhengyu Chen, Xinxi Yu, Yong Li, Ruijin Liao","doi":"10.1049/hve2.70167","DOIUrl":"10.1049/hve2.70167","url":null,"abstract":"The concentration of particles in transformer oil has a significant influence on its electrical performance, making oil cleanliness a critical parameter in the operation and maintenance of power transformers. However, the light obstruction (LO) method recommended by current standards has inherent limitations, including low sensitivity to irregular particles and the inability to characterise particle morphology. To address these deficiencies, this study introduces microflow imaging (MFI) as an alternative technique for insulating oil analysis. MFI is a high-precision method based on dynamic microscopic imaging that enables simultaneous measurement of particle concentration, size distribution and morphological characteristics. In this work, both LO and MFI methods were applied to oils collected from in-service transformers and accelerated thermal ageing of oil-paper insulation. For relatively clean oil, the ratio of particle counts measured by MFI to those obtained by LO ranged from 0.48 to 1.26, demonstrating good consistency. However, as contamination levels increased, the particle count detected by MFI reached up to 5 times that measured by LO. Notably, accelerated thermal ageing of oil–paper insulation at 130°C for 60 days resulted in an ∼28.94% increase in the proportion of elongated particles, with the total particle count measured by MFI being ∼4.82 times that obtained using LO. These results demonstrate that the LO method tends to underestimate particle quantities in oils with high concentrations of particles, particularly when irregular particles are present. By contrast, MFI exhibits significantly higher detection sensitivity. This study is the first to systematically demonstrate the technical advantages of MFI in evaluating particle contamination in transformer oil, providing a novel detection method for precise diagnostics of insulation conditions in power equipment.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"987-998"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708875","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}

引用次数: 0

Observing Electrical Discharge With High 3D Spatial Resolution 用高三维空间分辨率观察放电

IF 5.7 2区工程技术

High Voltage Pub Date : 2026-08-31 Epub Date: 2026-08-21 DOI: 10.1049/hve2.70242

Zhicheng Wu, Wenshuang Zhang, Zhetao Zhang, Yizhou Jiao, Le Feng, Qiaogen Zhang

{"title":"Observing Electrical Discharge With High 3D Spatial Resolution","authors":"Zhicheng Wu, Wenshuang Zhang, Zhetao Zhang, Yizhou Jiao, Le Feng, Qiaogen Zhang","doi":"10.1049/hve2.70242","DOIUrl":"https://doi.org/10.1049/hve2.70242","url":null,"abstract":"This study introduces an application of binocular stereo vision technology to achieve high-resolution 3D visualisation of submillimeter discharge channels. The proposed method can capture the depth information of weak luminous discharges and provide 3D discharge trajectories, providing new insights into the discharge mechanism. The camera parameters are selected by a multi-objective optimisation algorithm and calibrated using a micro-chessboard, thus addressing the complex calibration challenges associated with imaging microscopic objects. The brightness threshold-based point cloud filtering algorithm developed for this study improves the imaging quality of luminous channels under low-light conditions. Experimental validation involving 3D reconstruction of complex branched discharge channels in SF6/N2 mixtures reveals the key characteristics of the leader stepping mechanism. The accuracy and feasibility of the proposed method lay a solid foundation for future studies of discharge phenomena and the development of physical models of low-probability breakdown events.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"899-905"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70242","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148860033","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}

引用次数: 0

Research on the Online Diagnosis Method for Heating Types of Composite Insulator 复合绝缘子发热类型在线诊断方法研究

IF 5.7 2区工程技术

High Voltage Pub Date : 2026-08-31 Epub Date: 2026-08-09 DOI: 10.1049/hve2.70156

Hongwei Mei, Hongjiao Jiang, Senlin Liao, Chao Zhou, Hao Shen, Hui Liu, Xiaobo Meng, Liming Wang

引用次数: 0

Research on Embodied Intelligence Technology for Electric Power Equipment Based on Large‐Scale Pre‐Trained Models 基于大规模预训练模型的电力设备具身智能技术研究

IF 4.4 2区工程技术

High Voltage Pub Date : 2026-08-23 DOI: 10.1049/hve2.70227

Yuanpeng Tan,Rui Song,Ankai Zhang,Wenhao Mo,Wenjin Ji

{"title":"Research on Embodied Intelligence Technology for Electric Power Equipment Based on Large‐Scale Pre‐Trained Models","authors":"Yuanpeng Tan,Rui Song,Ankai Zhang,Wenhao Mo,Wenjin Ji","doi":"10.1049/hve2.70227","DOIUrl":"https://doi.org/10.1049/hve2.70227","url":null,"abstract":"ABSTRACT With the development of electric power artificial intelligence (AI) technology, many complicated challenges emerged during application. Traditional AI algorithms work well in specialised tasks such as detection and classification. However, they are unlikely to solve general problems. Embodied intelligence is a promising technology with the potential to address problems in both general and specialised areas. Instead of learning from primary datasets such as photos and texts, embodied intelligence learns through interactions with the surrounding environments from an egocentric perception similar to that of human beings. This provides embodied intelligence algorithms with adaptability and flexibility. This paper aims to provide an extensive research for the field of embodied intelligence in two aspects: navigating and operating. The navigation simulation result shows a notable recall enhancement of over 9.74% compared to other algorithms. The operating simulation achieves an average success rate of 50%, which is the first in this area. Eventually, with the new insights revealed through the simulation, this paper will provide more suggestions for the future development of embodied intelligence in electric power artificial intelligence.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"24 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Improved Method for Calculating the Radiative Cooling Heat Dissipation Power of an Oil‐Natural‐Air‐Natural Transformer 油-自然-空气-自然变压器辐射冷却散热功率的改进计算方法

IF 4.4 2区工程技术

High Voltage Pub Date : 2026-08-22 DOI: 10.1049/hve2.70235

Guoqiang Gao,Chuan Zhang,Yujun Guo,Yijie Liu,Xianzhi Zhou,Xiangyu Liu,Xingyi Huang,Guangning Wu

{"title":"An Improved Method for Calculating the Radiative Cooling Heat Dissipation Power of an Oil‐Natural‐Air‐Natural Transformer","authors":"Guoqiang Gao,Chuan Zhang,Yujun Guo,Yijie Liu,Xianzhi Zhou,Xiangyu Liu,Xingyi Huang,Guangning Wu","doi":"10.1049/hve2.70235","DOIUrl":"https://doi.org/10.1049/hve2.70235","url":null,"abstract":"ABSTRACT Radiative cooling holds potential for outdoor transformers in operation due to its zero‐energy consumption and high adaptability and has demonstrated effective heat dissipation in simulations of small distribution transformers. Accurate calculation of the transformer temperature rise and the radiative cooling effect is crucial for practical application. However, the existing method for evaluating the heat dissipation effect of radiative cooling technology on transformers approximates losses by using a constant heat source, neglecting the impact of temperature on losses, resulting in low accuracy in radiative cooling power. Consequently, this study introduces an electromagnetic‐thermal‐fluid‐radiation multiphysics coupling approach based on finite element analysis. This method accounts for the two‐way coupling of electromagnetic and thermal fields, along with the nonuniform distribution of losses. Firstly, based on the heat transfer process of an oil‐natural‐air‐natural (ONAN) transformer, a small test platform (tank dimensions of 30 cm × 20 cm × 30 cm, rated power of 250 W and similar to those of a 10 kVA–10 kV/220 V single‐phase ONAN transformer in dimensions and loss) is built to evaluate the proposed method's accuracy against the existing method. Comparative analysis shows that the proposed method yields maximum errors of −4.0% and −4.8% in temperature rise and radiative cooling heat dissipation effect calculations, respectively, demonstrating a significant accuracy improvement of 16.2% and 25.3% over the existing method. Finally, the radiative cooling heat dissipation characteristics of an 800 kVA–10 kV/3 kV three‐phase ONAN transformer (total losses amount to 8557.3 W) are simulated and analysed using the proposed method. This study serves as a guiding framework for the accurate estimation of radiative cooling power in outdoor power transformers.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"47 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0