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IF 4.9 2区工程技术

High Voltage Pub Date : 2026-02-16

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IF 4.9 2区工程技术

High Voltage Pub Date : 2026-02-16

引用次数: 0

Radio Interference Prediction Method for EHV AC Transmission Lines at High Altitudes Based on Long-Term Observations 基于长期观测的高海拔超高压交流输电线路无线电干扰预测方法

IF 4.4 2区工程技术

High Voltage Pub Date : 2026-02-11 DOI: 10.1049/hve2.70159

Yemao Zhang, Baoquan Wan, Yao Lu, Xingfa Liu, Bing Zhou, Jilai Xu, Hao Wan

{"title":"Radio Interference Prediction Method for EHV AC Transmission Lines at High Altitudes Based on Long-Term Observations","authors":"Yemao Zhang, Baoquan Wan, Yao Lu, Xingfa Liu, Bing Zhou, Jilai Xu, Hao Wan","doi":"10.1049/hve2.70159","DOIUrl":"https://doi.org/10.1049/hve2.70159","url":null,"abstract":"Radio interference (RI) is a critical factor in the design of extra-high voltage (EHV) transmission lines at high altitudes. To address the insufficient field data of RI on high-altitude transmission lines, the lack of adequate validation for existing RI prediction methods, and the difficulty in assessing RI levels under various meteorological parameters, this study investigated prediction methods for RI in high-altitude AC transmission lines based on long-term observations. First, the altitude correction factors for RI were investigated by comparing long-term observational data from different altitudes and results of movable corona cage tests. Second, a more accurate RI prediction method for high-altitude transmission lines was proposed by comparing the long-term measured data from four high-altitude observation stations with the predicted values derived from various formulae. Finally, correlation and multiple regression analyses were employed to develop RI prediction models considering the effects of different meteorological parameters under both rainy and fair weather conditions. The accuracy of these models was validated using actual measurement data. The findings provide important references for the prediction and evaluation of RI from EHV AC transmission lines at high altitudes.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"87 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160569","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}

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IF 4.9 2区工程技术

High Voltage Pub Date : 2026-02-11

引用次数: 0

IF 4.9 2区工程技术

High Voltage Pub Date : 2026-02-11

引用次数: 0

Arc Resistance Enhancement of Converter Transformer Tank Through Structural Improvements: Simulation and Experimental Validation 通过结构改进提高换流变压器油箱抗电弧能力：仿真与实验验证

IF 4.4 2区工程技术

High Voltage Pub Date : 2026-02-11 DOI: 10.1049/hve2.70157

Ke Wang, Shuqi Zhang, Yikun Zhao, Yichen Wang, Zongliang Zhang, Jinhua Zhang

{"title":"Arc Resistance Enhancement of Converter Transformer Tank Through Structural Improvements: Simulation and Experimental Validation","authors":"Ke Wang, Shuqi Zhang, Yikun Zhao, Yichen Wang, Zongliang Zhang, Jinhua Zhang","doi":"10.1049/hve2.70157","DOIUrl":"https://doi.org/10.1049/hve2.70157","url":null,"abstract":"Currently, limited research exists on the structural response and protection methods of the converter transformer tank for ± 800 kV ultra-high voltage direct current transmission project to high energy arc faults. This research investigates the dynamic response and the vulnerable areas of the ultra-high voltage converter transformer under the 50 MJ arc fault. It is found that the horizontal weld of the tank and the vertical weld of the tank are high strain concentration areas. Based on this, a design scheme for strengthening the weak areas of the transformer is proposed and the improvement effect is analysed via simulation. The results demonstrate that the improvement measures effectively reduce the strain level of the areas. In addition, the traditional transformer and the improved transformer are scaled down equivalently for experimental testing. To this end, mechanical structure, electrical circuit and data acquisition systems are established. The experimental results demonstrate the protective efficacy of the proposed measures, achieving peak strain reductions of 25.3% at the horizontal weld and 26.4% at the vertical weld.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"316 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146161002","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}

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An Improved Fast Computational Method for Vibration Characteristic Analysis of Dry-Type Iron Core Reactor 干式铁芯电抗器振动特性分析的改进快速计算方法

IF 4.4 2区工程技术

High Voltage Pub Date : 2026-02-11 DOI: 10.1049/hve2.70160

Wanqing Wang, Caibo Liao, Bang Liu, Kai Li, Wenyu Liu, Zhaoguo Li, Xianfa Tian

{"title":"An Improved Fast Computational Method for Vibration Characteristic Analysis of Dry-Type Iron Core Reactor","authors":"Wanqing Wang, Caibo Liao, Bang Liu, Kai Li, Wenyu Liu, Zhaoguo Li, Xianfa Tian","doi":"10.1049/hve2.70160","DOIUrl":"https://doi.org/10.1049/hve2.70160","url":null,"abstract":"Structural mechanics field simulation plays a critical role in the vibration characteristic analysis of electrical equipment. Existing structural field analysis of equipment based on numerical simulation faces challenges such as convergence difficulties and prolonged computational time, failing to meet the demand for real-time prediction of equipment status. In the rapid structural mechanics analysis of dry-type iron core reactor, the sparsity of snapshot matrix will compromise the computational efficiency of proper orthogonal decomposition (POD) algorithm and introduce substantial approximation errors in reduced-order models (ROMs). An improved POD method based on stochastic gradient descent (SGD) is proposed to realise the fast decomposition and calculation of sparse snapshot matrix in the paper. First, the SGD method is applied to the optimisation of snapshot matrix constructed from structural field simulation. Then, POD method is employed to extract the dominant reduced-order modes and the corresponding modal coefficient. Finally, a graph neural networks-based surrogate model is constructed to realise the rapid prediction of reactor vibration. Compared with conventional model reduction methods, the proposed method significantly improves the efficiency in handling rapid vibration simulation of dry-type iron core reactor, and the calculation error also decreases by 14.1%.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"33 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160573","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

Research on Power Frequency Insulation Properties and Configurations of CF3SO2F Gas Mixture for Industrial Applications 工业用CF3SO2F混合气工频绝缘性能及结构研究

IF 4.4 2区工程技术

High Voltage Pub Date : 2026-01-31 DOI: 10.1049/hve2.70131

Shubo Ren, Wenjun Zhou, Yu Zheng, Dongxin Hao, Wei Liu, Keli Gao

{"title":"Research on Power Frequency Insulation Properties and Configurations of CF3SO2F Gas Mixture for Industrial Applications","authors":"Shubo Ren, Wenjun Zhou, Yu Zheng, Dongxin Hao, Wei Liu, Keli Gao","doi":"10.1049/hve2.70131","DOIUrl":"https://doi.org/10.1049/hve2.70131","url":null,"abstract":"The breakdown characteristics of the novel eco-friendly insulating gas CF3SO2F are fundamental to the design of gas-insulated equipment. In this paper, the gas mixture parameters for CF3SO2F were optimised for different ambient temperatures in order to ascertain the insulation performance and liquefaction temperature constraints. To further assess its insulation properties, breakdown experiments were carried out under power-frequency voltage (50 Hz), considering the influence of buffer gas types, the molar ratio of CF3SO2F and pressure. The results demonstrate that the breakdown voltage of CF3SO2F is 1.2–1.5 times that of SF6, and it increases with pressure in the range of 0.1–0.4 MPa. When compared to air and CO2, N2 exhibits a superior synergistic effect with CF3SO2F. At an absolute pressure of 0.5 MPa, the 60% CF3SO2F/40% N2 mixture shows similar insulation strength to SF6, but it can only be applied in environments above 10°C. Furthermore, the 12% CF3SO2F/88% N2 mixture at an absolute pressure of 0.8 MPa has an insulation strength comparable to that of 0.5 MPa SF6, with a liquefaction temperature of −25°C. The results demonstrated great potential of industrial applications. At this configuration, global warming potential (GWP) of the gas mixture is only 4% that of SF6. The research provides a new solution for SF6 gas substitution in gas-insulated equipment.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"58 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122228","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}

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Combustion Performance of Silicone Rubber Polymer Insulation Material Under Damp-Heat Ageing Conditions: Molecular Insights Into the Effects of Structural Changes on Macroscopic Properties 湿热老化条件下硅橡胶聚合物绝缘材料的燃烧性能：结构变化对宏观性能影响的分子分析

IF 4.4 2区工程技术

High Voltage Pub Date : 2026-01-31 DOI: 10.1049/hve2.70165

Wenyu Ye, Xinhan Qiao, Wentian Zeng, Le Yu, Yinfu Chen, Ke Xu, Jianwen Zhang

{"title":"Combustion Performance of Silicone Rubber Polymer Insulation Material Under Damp-Heat Ageing Conditions: Molecular Insights Into the Effects of Structural Changes on Macroscopic Properties","authors":"Wenyu Ye, Xinhan Qiao, Wentian Zeng, Le Yu, Yinfu Chen, Ke Xu, Jianwen Zhang","doi":"10.1049/hve2.70165","DOIUrl":"https://doi.org/10.1049/hve2.70165","url":null,"abstract":"Silicone rubber (SR), an organic silicon polymer material, is known for its excellent heat resistance and mechanical properties. It is widely used in composite insulators and cable accessory materials. However, the ageing caused by humidity and heat significantly impacts its performance, an issue that cannot be ignored. This paper investigates the changes in the combustion performance of SR insulation materials during wet-heat ageing, focussing on both experimental and simulation-based approaches. Through macroscopic experiments, SR samples underwent wet-heat ageing tests, and the changes in combustion phenomena, oxygen index, afterflame time, and microstructure with varying ageing degrees were studied. Molecular simulation techniques were employed to uncover the mechanism by which structural changes during wet-heat ageing affect SR's combustion performance. The results reveal that as the ageing degree increases, the colour of the SR sample remains largely unchanged, but the surface shows an increasing number of wrinkles, holes, and traces of filler precipitation. The combustion characteristics of SR exhibit a noticeable upward trend as the ageing degree deepens. Using the ReaxFF force field, five distinct structural changes during wet-heat ageing were identified and categorised from ageing degree 0 to ageing degree 5. As the ageing degree increases, the spatial ductility and thermal stability of SR change significantly, which in turn alters the intermolecular forces within the material. These structural changes lead to improved combustion performance of SR. This paper provides theoretical guidance for understanding the evolution of SR's performance during ageing and its implications for future research and material development.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"55 3 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122229","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}

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Evaluation Methodology, Numerical Verification and Retrofilling Procedure for Power Transformers to Ensure K-Class Flame Retardancy and Environmentally Friendly 电力变压器k级阻燃性和环境友好性的评估方法、数值验证和充注程序

IF 4.4 2区工程技术

High Voltage Pub Date : 2026-01-28 DOI: 10.1049/hve2.70127

Zhenfu Tang, Yihua Qian, Dan Zhou, Wei Hu, Feipeng Wang, Yang Xu

{"title":"Evaluation Methodology, Numerical Verification and Retrofilling Procedure for Power Transformers to Ensure K-Class Flame Retardancy and Environmentally Friendly","authors":"Zhenfu Tang, Yihua Qian, Dan Zhou, Wei Hu, Feipeng Wang, Yang Xu","doi":"10.1049/hve2.70127","DOIUrl":"https://doi.org/10.1049/hve2.70127","url":null,"abstract":"With increasing demands for fire safety and environmental friendliness, retrofilling transformers with alternative insulating liquids has become a growing trend. However, retrofilling power transformers remains uncertain, as more residual mineral oil compromises K-class flame retardancy, and its impact on environmental performance has yet to be clarified. Meanwhile, there is a lack of evaluation methodology and retrofilling procedure for power transformers. This paper presents a synthetic ester retrofilling conducted on a 20 MVA/110 kV transformer. Kerosene vapour-phase drying was implemented to supplement traditional oil draining, and the insulating liquid achieved a fire point of 304°C, meeting K-class flame retardancy after retrofilling. The estimated residual mineral oil content was less than 0.8 wt%, significantly lower than the typically reported value (e.g., 3 wt%–5 wt%). Standardised testing confirmed that the synthetic ester containing 3.5% mineral oil maintained its environmental performance, achieving 82.6% biodegradability. Additionally, the evaluation methodology and recommended procedure for retrofilling power transformers are proposed in this study. The performance changes of the retrofilled transformer were discussed in detail. A significant decrease in lightning impulse insulation margin and insulation resistance was observed, which should be given particular attention.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"143 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070201","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