High Voltage最新文献_第6页

Nanoparticle-enhanced dielectric oils for improved electrical insulation: Comparison of MgO, Al2O3, and SiO2-based dielectric nanofluids 纳米颗粒增强电介质油用于改善电绝缘：MgO， Al2O3和sio2基电介质纳米流体的比较

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-02-04 DOI: 10.1049/hve2.12515

Mehmet Karataş, Yunus Biçen

{"title":"Nanoparticle-enhanced dielectric oils for improved electrical insulation: Comparison of MgO, Al2O3, and SiO2-based dielectric nanofluids","authors":"Mehmet Karataş, Yunus Biçen","doi":"10.1049/hve2.12515","DOIUrl":"https://doi.org/10.1049/hve2.12515","url":null,"abstract":"This study provides comprehensive and quantitative assessments of the electrical insulation, viscosity, thermal conductivity, flash point, acidity, and stability of dielectric nanofluids. In the experiment, naphthenic mineral oil was chosen as the base fluid. MgO, Al2O3, and SiO2 were preferred as nanoparticles. In the dielectric breakdown voltage (BDV) tests performed, increased values were observed at certain concentrations for each nanofluid, with the highest value in the SiO2-based nanofluid being 83.47 kV at a concentration rate of 0.05 g/L. Adding nanoparticles to the base oil increased the viscosity of all suspensions. Except for MgO-based dielectric nanofluid, the flash points of other nanofluids increased as compared to pure oil. Total acid number (TAN) values, on the other hand, increased for SiO2- and Al2O3-based nanofluids but decreased for MgO-based nanofluids. However, all values are quite below the standard limit of 0.25 mgKOH/g. The percentage transmittance values calculated from the ultraviolet and visible light (UV–vis) spectrophotometry results differed for each nanofluid. However, they were all lower than the base oil. In general, the results indicate that the use of dielectric nanofluids in electrical systems will be beneficial, provided that the problem of long-term stabilisation is solved.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"10 2","pages":"493-504"},"PeriodicalIF":4.4,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12515","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892789","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

Effect of field-induced dynamic parameters on the electric field distortion characteristic of high voltage oil-immersed bushing 场致动力学参数对高压油浸套管电场畸变特性的影响

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-01-29 DOI: 10.1049/hve2.12521

Mingze Zhang, Bingjie Wang, Ji Liu, Hao Yun, Dexin Li, Muhe Yu, Yufei Sun, Chunming Zhao

{"title":"Effect of field-induced dynamic parameters on the electric field distortion characteristic of high voltage oil-immersed bushing","authors":"Mingze Zhang, Bingjie Wang, Ji Liu, Hao Yun, Dexin Li, Muhe Yu, Yufei Sun, Chunming Zhao","doi":"10.1049/hve2.12521","DOIUrl":"https://doi.org/10.1049/hve2.12521","url":null,"abstract":"As an important component of oil-immersed transformers, the bushing's internal insulation ageing and dampness after the long-term operation can cause changes in the internal electric and temperature fields, seriously threatening its safe operation. This paper tested the power frequency permittivity and direct current conductivity of aged and damp oil-paper insulation samples at different testing temperatures, and constructed a dynamic dielectric parameter calculation model. Meanwhile, a simulation model was established based on the actual structure of the 252 kV/1250 A bushing which is mainly used for the oil-immersed high-voltage bushings of 110 kV and above. The electric-magnetic-thermal multi-physical fields were used for simulation analysis. The influence of ageing/moisture (different degrees of dampness in the upper and lower regions) on the electric field distribution in the bushing was obtained. During the initial to steady-state process, the electric field distribution at the zero and end shield shows a reversal phenomenon. When the capacitor core has different degrees of dampness in the upper and lower regions, the impedance distribution of the capacitor core is non-uniform. This phenomenon will lead to an increase in the radial electric field gradient at the end shield of the capacitor core, which is prone to the risk of slip-flashing discharge. In summary, this paper adopts the field-induced dynamic parameters method to analyse the changes of multi-physical fields in the bushing. This can provide theoretical guidance for optimising the bushing structure and on-site maintenance.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"10 3","pages":"773-784"},"PeriodicalIF":4.4,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12521","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144520260","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

Influence of maleic anhydride grafting on the positive temperature coefficient effect of semi-conductive composites and space charge injection to XLPE insulation 马来酸酐接枝对半导电复合材料正温度系数效应及交联聚乙烯绝缘空间电荷注入的影响

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-01-22 DOI: 10.1049/hve2.12504

Chengcheng Zhang, Sen Wang, Hong Zhao, Minghua Chen, Xuan Wang, Xiaohong Chi

{"title":"Influence of maleic anhydride grafting on the positive temperature coefficient effect of semi-conductive composites and space charge injection to XLPE insulation","authors":"Chengcheng Zhang, Sen Wang, Hong Zhao, Minghua Chen, Xuan Wang, Xiaohong Chi","doi":"10.1049/hve2.12504","DOIUrl":"https://doi.org/10.1049/hve2.12504","url":null,"abstract":"To suppress the resistivity positive temperature coefficient (PTC) effect of ethylene-butyl acrylate copolymer (EBA)-based semi-conductive shielding layer and the injection of charge carriers to insulation layer, the polar molecule maleic anhydride (MAH) is grafted onto EBA macromolecules by melt blending and thermal grafting. The resistivity temperature stability of the grafted semi-conductive composites, as well as the space charge distribution and direct current (DC) breakdown characteristics of cross-linked polyethylene (XLPE) insulation using the composites as the electrode is investigated. The results show that MAH grafting can significantly reduce the volume resistivity of semi-conductive composites, especially at a higher temperature, to suppress the PTC effect. And, the grafted semi-conductive composites can prevent the injection of charge carriers to XLPE insulation from the semi-conductive electrode to improve the space charge distribution and DC breakdown strength of XLPE insulation. The polar anhydride groups in the grafted MAH can enhance the interaction between EBA macromolecular chains and between EBA macromolecular chains and carbon black (CB) to improve the dispersion of CB in EBA matrix and the stability of the internal conductive network at the high temperature, improving the properties of EBA-based semi-conductive shielding layer and DC electrical properties of XLPE insulation layer.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"10 2","pages":"517-529"},"PeriodicalIF":4.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12504","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892842","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

Electrohydraulic effect of microsecond pulsed discharge in transformer oils 变压器油微秒脉冲放电的电液效应

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-01-21 DOI: 10.1049/hve2.12519

Hang Wang, Cheng Zhang, Zhuofei Wang, Shuai Zhang, Kaihang Guo, Tao Shao

{"title":"Electrohydraulic effect of microsecond pulsed discharge in transformer oils","authors":"Hang Wang, Cheng Zhang, Zhuofei Wang, Shuai Zhang, Kaihang Guo, Tao Shao","doi":"10.1049/hve2.12519","DOIUrl":"https://doi.org/10.1049/hve2.12519","url":null,"abstract":"The physical process of microsecond pulsed discharge in transformer oil is the foundation for studying the initial mechanics of faults in ultra-high voltage transformers. However, the microsecond-scale electrohydraulic effect in transformer oil has not been investigated yet. In this paper, the shock wave and bubble generated by microsecond pulsed discharge in transformer oil between needle-needle electrodes are studied using a Schlieren system with a high-speed camera. The results show that the discharge channel in the 0.1 mm oil gap forms in 9.50 µs when the streamer and the first shock wave are observed. The bubble between electrodes expands in the subsequent 218.50 µs. Then, the bubble collapses when the second shock wave is observed. The velocities of the first and the second shock wave are 1388.16 and 1465.46 m/s, respectively. With the gap distance increase, all the breakdown voltage, the discharge energy, and the ratio of the mechanical energy to total energy increase, the breakdown current, the acceleration of the container wall, and the velocity of the shock wave decrease. It can be concluded that the first shock wave is generated by the streamer of microsecond pulsed discharge and the second shock wave is induced by the rapid density change due to the bubble collapsing.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"10 1","pages":"137-145"},"PeriodicalIF":4.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12519","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143536080","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

Preparation of magnetic-oriented electronic packaging composite materials with improved thermal conductivity and insulating properties by filling magnetic BN@Fe3O4 core-shell particles into epoxy 在环氧树脂中填充磁性BN@Fe3O4核壳颗粒制备导热性和绝缘性能提高的磁性电子封装复合材料

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-01-19 DOI: 10.1049/hve2.12466

Zeyu You, Ling Weng, Lizhu Guan, Xiaorui Zhang, Zijian Wu, Hao Chen, Wei Zhao

{"title":"Preparation of magnetic-oriented electronic packaging composite materials with improved thermal conductivity and insulating properties by filling magnetic BN@Fe3O4 core-shell particles into epoxy","authors":"Zeyu You, Ling Weng, Lizhu Guan, Xiaorui Zhang, Zijian Wu, Hao Chen, Wei Zhao","doi":"10.1049/hve2.12466","DOIUrl":"https://doi.org/10.1049/hve2.12466","url":null,"abstract":"Epoxy resin (EP), as a resin material with excellent insulation performance, has been widely applied in fields such as electronics, coatings, ships etc. However, epoxy resins generally have poor thermal conductivity, which limits their application in the field of new generation of electronic packaging. To address the key issues mentioned above, the BN@Fe3O4 particles with positive out-of-plane thermal conductivity were successfully prepared in this study, having a core-shell structure with rough surfaces as well. As a thermal conductive powder, the disadvantage of hexagonal boron nitride being easily agglomerated in resin has been improved. By applying an external magnetic field, three-dimensional thermal conduction pathways were constructed in the matrix. The physical and chemical properties of the BN@Fe3O4 powder and its composite materials were analysed and tested. The experiment indicates that the thermal conductive magnetic powder BN@Fe3O4 had been successfully prepared. When the filling amount of BN@Fe3O4 reached 27.5 vol%, the out-of-plane thermal conductivity of the composite material was 1.758 W m−1 K−1, which was 982.12% that of pure EP. At this point, the mechanical behaviour and insulation performance of EP composite materials can be effectively guaranteed at the same order of magnitude as pure EP performance.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"10 1","pages":"219-227"},"PeriodicalIF":4.4,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12466","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143536018","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

Temperature rise characteristics of C5F10O/CO2 gas mixture AC high voltage switch bus C5F10O/CO2混合气交流高压开关母线温升特性

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-12-31 DOI: 10.1049/hve2.12516

Zhaoxuan Cui, Xin Lin, Xiaolong Li, Yalong Xia, Zhenxin Geng, Jianyuan Xu

{"title":"Temperature rise characteristics of C5F10O/CO2 gas mixture AC high voltage switch bus","authors":"Zhaoxuan Cui, Xin Lin, Xiaolong Li, Yalong Xia, Zhenxin Geng, Jianyuan Xu","doi":"10.1049/hve2.12516","DOIUrl":"https://doi.org/10.1049/hve2.12516","url":null,"abstract":"C5F10O/CO2 gas mixture is one of the most promising alternatives to SF6 as an insulating gas in high-voltage switchgear. As a key performance index in product design, the temperature rise characteristics are rarely reported. In this paper, the thermodynamic parameters of C5F10O/CO2 gas mixture were calculated first. Then, the calculation model of transient temperature rise was constructed for a 252 kV/3150 A bus, and a temperature rise experimental platform was built to verify the reliability of the proposed calculation model. On this basis, the influence of different factors such as load current, charging pressure, mixing ratio, and structure size on the temperature rise of the bus was further analysed, and it is found that increasing the charging pressure and the mixing ratio of C5F10O could effectively reduce the bus temperature rise but it still could not reach the level of SF6. The main structure size that affects the temperature rise of the bus is the outer diameter of the conductor, which increases by 10.2%, and the temperature rise is the same as that of the original SF6 bus. Finally, a high-precision bus temperature rise surrogate model, which combined with the Latin hypercube model, the coefficient of prognosis, and the Kriging fitting method was established to facilitate the structural design.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"10 2","pages":"325-336"},"PeriodicalIF":4.4,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12516","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892884","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

Stress analysis and structural optimisation of insulating rods under dynamic and static loads 动态和静态载荷下绝缘棒的应力分析和结构优化

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-12-30 DOI: 10.1049/hve2.12512

Haifeng Jin, Lijun Jin

{"title":"Stress analysis and structural optimisation of insulating rods under dynamic and static loads","authors":"Haifeng Jin, Lijun Jin","doi":"10.1049/hve2.12512","DOIUrl":"https://doi.org/10.1049/hve2.12512","url":null,"abstract":"This study aims to provide a theoretical basis for the fatigue characteristics and structural optimisation of insulating rods to enhance their reliability and lifespan in practical applications. This paper uses COMSOL to complete the stress analysis of insulating rods under dynamic and static loads based on the finite element method. The correctness of the model is verified based on the elastic-plastic theory. The simulation results show that under the same load, the stress concentration area is more affected by the dynamic load, and the stress concentration position is highly consistent with the fracture position of the rod in the experiment. It verifies the impact on the insulating rods at different speeds and static load stress. Simulation shows that, in cases where the allowable stress is exceeded, as the number of operations increases, the fatigue characteristics will greatly affect the service life of the insulation rod. Finally, the fatigue analysis and structural optimisation of the insulating rod were completed, providing important reference values for the long-term stable operation of ultra-high voltage circuit breakers.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"10 1","pages":"116-125"},"PeriodicalIF":4.4,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12512","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143536085","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

Positive corona discharge of rod-plate electrodes in high-speed airflow 高速气流中棒板电极的正电晕放电

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-12-28 DOI: 10.1049/hve2.12514

Qiang Wu, Yu Wang, Zhengxian Du, Zeliang Wu, Yeqiang Deng, Xishan Wen

{"title":"Positive corona discharge of rod-plate electrodes in high-speed airflow","authors":"Qiang Wu, Yu Wang, Zhengxian Du, Zeliang Wu, Yeqiang Deng, Xishan Wen","doi":"10.1049/hve2.12514","DOIUrl":"https://doi.org/10.1049/hve2.12514","url":null,"abstract":"The characteristics of positive corona discharge of rod electrode in high-speed airflow are studied in this paper. The experiments were carried out in a wind tunnel with a maximum flow speed of 100 m/s in a dark room. The discharge voltage and current were recorded and the corona patterns were captured by a digital single lens reflex (DSLR) camera during the experiment. A discharge transition in rod electrode from streamer corona to mixed streamer-glow corona, and finally to stable glow discharge was observed with the voltage increased. The increase of airflow speed resulted in a decrease of each corona inception voltages. The streamers will be suppressed and shifted towards the upwind side, while the glow layer will be promoted and shifted towards the downwind side in low and upwind side in high voltages. The glow corona current and the voltage show a quadratic function and the higher the airflow speeds, the bigger the coefficient of square of voltage. The distributions of peaks, pulse widths and interval times of streamer pulses were analysed, showing good correspondence with the streamer images. The measurements were explained by combining particle transport and local air pressure distribution.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"10 2","pages":"337-350"},"PeriodicalIF":4.4,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12514","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893002","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

Time–frequency characteristics and influencing factors of the pressure wave caused by power–frequency arc inside a closed oil tank 闭式油罐工频电弧压力波时频特性及影响因素

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-12-28 DOI: 10.1049/hve2.12500

Yunfei Jia, Shengchang Ji, Xun Luo, Shuangrui Jia, Simeng Li

{"title":"Time–frequency characteristics and influencing factors of the pressure wave caused by power–frequency arc inside a closed oil tank","authors":"Yunfei Jia, Shengchang Ji, Xun Luo, Shuangrui Jia, Simeng Li","doi":"10.1049/hve2.12500","DOIUrl":"https://doi.org/10.1049/hve2.12500","url":null,"abstract":"The arc faults inside oil-immersed power equipment can produce high-amplitude pressure waves inside tanks, which might cause ignition and explosion accidents. This kind of failure is one of the most severe faults for power equipment and has attracted considerable attention in recent years. However, due to the high risk of the experiments and the complex development of arc in oil, the characteristics of the pressure wave formed by the arc are still confusing. In this paper, the time–frequency characteristics of pressure waves are analysed using several experiments of 1–8 kA power–frequency arc inside a closed oil tank. The experimental results show that the pressure wave produced by the arc in oil contains three frequency bands, 0–500 Hz, 500 Hz–40 kHz, and above 40 kHz, which are related to the arc energy, the average current around arc ignition and the metal wire explosion respectively. This helps further understand the formation mechanism of the pressure wave caused by the arc in oil. This paper discusses the influences of ignition wire on arc-formed pressure waves. A wire diameter selection method for arc experiments is established to reduce the pressure differences between wire-ignited arcs and actual arc faults.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"10 3","pages":"699-709"},"PeriodicalIF":4.4,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12500","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519653","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

Mechanism and suppression of breaking overvoltage of DC circuit breakers 直流断路器分断过电压的机理及抑制

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-12-28 DOI: 10.1049/hve2.12491

Lu Qu, Zhangqing Yu, Zhizheng Gan, Xin Yan, Cheng Jiang, Yulong Huang, Mingshen Li, Jian Feng

引用次数: 0