High Voltage最新文献_第10页

Observation and verification of surface electrical explosion driven by radial-distributed pulsed current in laboratory lightning strike test 实验室雷击试验中径向分布脉冲电流驱动表面电爆炸的观测与验证

IF 4.4 2区工程技术

High Voltage Pub Date : 2023-09-08 DOI: 10.1049/hve2.12373

Ruoyu Han, Yuchen Cao, Yakun Liu, Xi Chen, Ting Li, Chen Li, Pengfei Li

{"title":"Observation and verification of surface electrical explosion driven by radial-distributed pulsed current in laboratory lightning strike test","authors":"Ruoyu Han, Yuchen Cao, Yakun Liu, Xi Chen, Ting Li, Chen Li, Pengfei Li","doi":"10.1049/hve2.12373","DOIUrl":"10.1049/hve2.12373","url":null,"abstract":"The laboratory lightning test is essential for assessing the effectiveness of lightning strike protection (LSP). Particularly, direct lightning strike damage can be performed with pulsed current injection into the specimen. This paper focuses on the dynamic process of arc plasma and shock wave behaviour in the vicinity of the ‘strike’ point. A rod-plate discharge load is built for testing aluminium and coated plate under 40-kA-level pulsed current. The visualisation of the luminous discharge plasma and its flow field via high-speed photography (from different angles) is meticulously designed and implemented, synchronised with electro-physical diagnostics. The results indicate some new mechanisms for lightning strike damage, apart from the impulse heat loading from the thermal arc. The transient current injection through the arc root concentrates on a thin skin layer (skin-depth effect), with the radial-attenuated current density, driving asynchronously electrical explosions on the plate surface. The inhomogeneous Joule heating of the plate leads to outwardly propagating phase transition and shock wave along the conductive surface. In addition, the electro-thermal instability is observed and regarded as the seed of irregular erosion region. Spectroscopic information reveals two different plasma states of main discharge arc channel and adjacent surface electrical explosion. The correspondence of the physical mechanism of electrical explosion and optical radiation is established. Microscopic images for different regions depict erosion characteristics and summarise influencing factors, further confirming the mechanism above. The research clarifies the role of skin-depth effect in transaction arc erosion for electrode, complements the electrical explosion theory with unevenly distributed current and helps optimise strategies of LSP.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12373","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48217327","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

Microwave diagnostics of pulsed atmospheric discharge with electrolytic electrode and long-lived luminous formation in its afterglow 用电解电极对脉冲大气放电的微波诊断及其余辉中的长寿命发光结构

IF 4.4 2区工程技术

High Voltage Pub Date : 2023-09-08 DOI: 10.1049/hve2.12371

Shixin Zhao, Xingbao Lyu, Aleksandr Astafiev, Chengxun Yuan, Lin Miao, Jingfeng Yao, Ying Wang, Anatoly Kudryavtsev, Aleksandr Chirtsov, Gennadii Shabanov, Zhongxiang Zhou

{"title":"Microwave diagnostics of pulsed atmospheric discharge with electrolytic electrode and long-lived luminous formation in its afterglow","authors":"Shixin Zhao, Xingbao Lyu, Aleksandr Astafiev, Chengxun Yuan, Lin Miao, Jingfeng Yao, Ying Wang, Anatoly Kudryavtsev, Aleksandr Chirtsov, Gennadii Shabanov, Zhongxiang Zhou","doi":"10.1049/hve2.12371","DOIUrl":"10.1049/hve2.12371","url":null,"abstract":"The Gatchina discharge phenomenon holds significant promise as a laboratory model for simulating ball lightning. However, crucial aspects concerning the plasma components of the resulting afterglow remain unresolved. Notably, the measurement of the electron density, a critical parameter, has not been fully achieved thus far. In this study, microwave diagnostics and video recording were employed during a pulsed Gatchina discharge, along with synchronous measurement of discharge current and voltage. Distinct antennas were positioned at different heights to enable separate diagnosis of the discharge and the ensuing long-lived afterglow. The findings revealed that during the active phase of the Gatchina discharge, the plasma density was substantial enough to cause reflection of an electromagnetic wave with a frequency of 20 GHz from this highly conductive object. In the afterglow, the signal experienced only a moderate weakening of 10–20 percent, facilitating the determination of the time dependence of average electron density during the afterglow's passage between the two antennas. These measurements verified the unusually slow plasma decay in the afterglow of the Gatchina discharge, suggesting the potential significance of chemi-ionisation processes involving long-lived (metastable) particles.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12371","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48711385","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

Analyses on an electronic voltage transformer's failure by its resonance with very fast transient overvoltage and suppression 电子电压互感器快速瞬态过电压抑制谐振失效分析

IF 4.4 2区工程技术

High Voltage Pub Date : 2023-09-08 DOI: 10.1049/hve2.12370

Houda Zhu, Qing Chen, Hongbin Li, Yue Tong, Linshan Han, Yang Jiao

引用次数: 0

Statistical analysis and interpretation on lightning impulse breakdown voltages of ester liquids under varying field uniformity 异场均匀性下酯类液体雷击击穿电压的统计分析与解释

IF 4.4 2区工程技术

High Voltage Pub Date : 2023-09-07 DOI: 10.1049/hve2.12364

Haichuan Yu, Qiang Liu, Zhongdong Wang

{"title":"Statistical analysis and interpretation on lightning impulse breakdown voltages of ester liquids under varying field uniformity","authors":"Haichuan Yu, Qiang Liu, Zhongdong Wang","doi":"10.1049/hve2.12364","DOIUrl":"10.1049/hve2.12364","url":null,"abstract":"Ester liquids (ELs), as the alternative transformer liquids to the conventional mineral oils (MOs), have been increasingly used in power transformers with high voltage ratings. Among various properties, the lightning impulse breakdown voltages (LIBDVs) have been studied elaborately in the past two decades under different electric field uniformities. The electric field uniformities do have an effect on the breakdown characteristics, for example, breakdown mechanisms, polarity effects, and differences of LIBDV between ELs and MOs, which is quantitatively investigated based on the LIBDVs collected from the literatures. The breakdown mechanism transition phenomenon between streamer initiation dominated breakdown and streamer propagation dominated breakdown has been reviewed firstly. Then, the transition field factor boundaries to observe the polarity effect on LIBDVs are taken at around 20 for ELs and 10 for MOs. Besides, the transition field factor boundaries to observe the LIBDV distinctions between ELs and MOs are about 109 and 14 under positive and negative lightning impulse, respectively. The systematic analysis and interpretation on the transition field factor boundaries among different phenomena can provide insights on insulation design of ELs filled power transformers.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12364","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41915809","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

Improving IEC thermal model for oil natural air natural transformers using optimised parameters based on dynamic simulation 采用基于动态仿真的优化参数改进油-气自然变压器的IEC热模型

IF 4.4 2区工程技术

High Voltage Pub Date : 2023-09-04 DOI: 10.1049/hve2.12374

Lijing Zhang, Yingting Luo, Gehao Sheng, Zizhan Ni, Xiuchen Jiang

{"title":"Improving IEC thermal model for oil natural air natural transformers using optimised parameters based on dynamic simulation","authors":"Lijing Zhang, Yingting Luo, Gehao Sheng, Zizhan Ni, Xiuchen Jiang","doi":"10.1049/hve2.12374","DOIUrl":"10.1049/hve2.12374","url":null,"abstract":"Accurate assessment of hot-spot temperature is essential for the safe operation of power transformers. Existing dynamic thermal models cannot estimate hot-spot temperature accurately since some input parameters are roughly determined by transformer capacity and cooling mode while ignoring the effect of winding structure, tank dimensions, and material physical properties. To improve the accuracy of temperature assessment, empirical parameters of the IEC thermal model including thermal constants, winding and oil exponents are optimised with the help of numerical simulation in this article. Based on energy conservation and heat transfer theory, a computational fluid dynamic (CFD) model of a transformer in oil natural air natural (ONAN) cooling mode is established. This CFD model simulates the entity's structure, sizes, and multi-stage heat dissipation processes realistically, so it can more precisely calculate the dynamic hot-spot temperature. According to the simulated temperature curves at different operating conditions, the thermal constants and oil exponent are estimated using non-linear regression, and the winding exponent is optimised using linear regression. A case study is conducted on an ONAN transformer. It shows the improved IEC model with optimised parameters can more accurately evaluate hot-spot temperature, and the absolute error is decreased by 2.4 K (38.7%) compared with traditional thermal models.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12374","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41840446","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

Carbon nanotubes and hexagonal boron nitride nanosheets co-filled ethylene propylene diene monomer composites: Improved electrical property for cable accessory applications 碳纳米管和六方氮化硼纳米片共填充乙丙二烯单体复合材料:改善电缆附件应用的电气性能

IF 4.4 2区工程技术

High Voltage Pub Date : 2023-09-04 DOI: 10.1049/hve2.12366

Tiandong Zhang, Huiduo Xu, Chuanxian Dai, Changhai Zhang, Yongquan Zhang, Qingguo Chi

{"title":"Carbon nanotubes and hexagonal boron nitride nanosheets co-filled ethylene propylene diene monomer composites: Improved electrical property for cable accessory applications","authors":"Tiandong Zhang, Huiduo Xu, Chuanxian Dai, Changhai Zhang, Yongquan Zhang, Qingguo Chi","doi":"10.1049/hve2.12366","DOIUrl":"10.1049/hve2.12366","url":null,"abstract":"Rubber-based composites based on ethylene propylene diene monomer (EPDM) with excellent non-linear electrical conductivity are preferred to serve as reinforced insulation in cable accessories, which can self-adaptively regulate electric field distribution and avoid electric field concentration due to the non-linear conductivity. The conductive carbon nanotubes (CNT) are filled into EPDM to improve the non-linear conductivity, while the insulating hexagonal boron nitride nanosheets (h-BN) are used to reconcile the electric breakdown strength. The results show that with the increase of CNT loading content, the non-linear conductivity of CNT/h-BN/EPDM composites becomes more prominent, accompanying the decrease of threshold field strength and increase of non-linear coefficient. However, the electric breakdown strength of CNT/h-BN/EPDM composites seriously deteriorates due to the increase of CNT content and temperature. By incorporating 10 wt.% h-BN into the composites, the reduction percentage of breakdown strength can be significantly lowered, which is 19.95% of neat EPDM and 13.74% of CNT/h-BN/EPDM composites at 70°C, respectively. The COMSOL Multiphysics simulation results demonstrate that using the CNT/h-BN/EPDM composite as the reinforced insulation can eliminate the electric field concentration of the cable accessory as well as enable the cable accessory with good lightning shock resistance.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12366","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47107893","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

A method for detecting two-dimensional plane stress distribution in basin-type insulator based on critically refracted longitudinal wave 基于临界折射纵波的盆型绝缘子二维平面应力分布检测方法

IF 4.4 2区工程技术

High Voltage Pub Date : 2023-09-01 DOI: 10.1049/hve2.12369

Zhaoyang Kang, Fuqiang Ren, Hongru Zhang, Jingjing Yang, Kaining Hou, Qingquan Li, Dongxin He, Hongshun Liu, Yongzhi Zhao, Huaxin Wen

{"title":"A method for detecting two-dimensional plane stress distribution in basin-type insulator based on critically refracted longitudinal wave","authors":"Zhaoyang Kang, Fuqiang Ren, Hongru Zhang, Jingjing Yang, Kaining Hou, Qingquan Li, Dongxin He, Hongshun Liu, Yongzhi Zhao, Huaxin Wen","doi":"10.1049/hve2.12369","DOIUrl":"10.1049/hve2.12369","url":null,"abstract":"Basin-type insulator often has small cracks due to stress concentration. The current method cannot accurately reflect the stress condition of the insulator to find the stress concentration areas. To solve these problems, a method for detecting two-dimensional plane stress (δ1 and δ2) within different depth ranges in a basin-type insulator is proposed based on critically refracted longitudinal (LCR) wave. First, the acoustoelastic equation characterising the relationship between the variation of LCR wave propagation time and the plane stress was derived. Next, the propagation characteristics of LCR wave in epoxy resin samples were investigated. Then, the stress distribution within different depth ranges of the insulator subjected to hydraulic load was measured using the proposed method, including direction (θ), δ1 and δ2. The results show that the magnitude of the stress alone cannot accurately characterise the stress state. Points with equal distances to the centre have similar stress magnitudes, but their directions are not the same. With increasing depth, θ remains essentially unchanged at the same location, while δ1 and δ2 decrease, and the rate of decrease varies at different locations. Comparing the measured and simulated data, the results showed that they were in good agreement, and the maximum errors of stress value and θ were 0.69 MPa and 2.97°, respectively, which confirmed the feasibility and accuracy of the stress detection in the proposed method.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12369","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43888570","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 vibration energy harvesting technology of power equipment based on alternating magnet array 基于交变磁体阵列的电力设备振动能量收集技术研究

IF 4.4 2区工程技术

High Voltage Pub Date : 2023-08-31 DOI: 10.1049/hve2.12367

Pinlei Lv, Chengyu Fan, Aijun Yang, Huan Yuan, Jifeng Chu, Mingzhe Rong, Xiaohua Wang

{"title":"Research on vibration energy harvesting technology of power equipment based on alternating magnet array","authors":"Pinlei Lv, Chengyu Fan, Aijun Yang, Huan Yuan, Jifeng Chu, Mingzhe Rong, Xiaohua Wang","doi":"10.1049/hve2.12367","DOIUrl":"10.1049/hve2.12367","url":null,"abstract":"Vibration with a frequency of 100 Hz is widely distributed in the power equipment, and it can provide a new way to supply energy for sensors by vibration energy harvesting. The vibration energy harvesting method based on electromagnetic induction principle was studied through the arrayed structure of magnets and coils. Static magnetic field models were established for four magnet array structures and it was found that the alternating magnet array has the largest magnetic flux and magnetic flux gradient. Based on the alternating magnet array, prototypes of energy harvester with vertical and parallel movement mode were proposed. Through structural parameter optimisation analysis, two different energy harvesters were fabricated and it was found that the energy harvester with a parallel movement mode has better output performances. The energy harvester could provide output voltage/current and power of 8.35 V/17.39 mA and 15.13 mW (matched resistance is 200 Ω) at an acceleration of 5 m·s−2. The 100 mF capacitor could be charged to 2.72 V within 300 s, and the final voltage of the capacitor is greater than 3 V, which could sustainably drive commercial wireless temperature/humidity sensors.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12367","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42282418","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

Multidimensional coupled structure-activity relationship models for replacement of SF6 SF6置换的多维耦合结构-活性关系模型

IF 4.4 2区工程技术

High Voltage Pub Date : 2023-08-29 DOI: 10.1049/hve2.12368

Mi Zhang, Hua Hou, Baoshan Wang

{"title":"Multidimensional coupled structure-activity relationship models for replacement of SF6","authors":"Mi Zhang, Hua Hou, Baoshan Wang","doi":"10.1049/hve2.12368","DOIUrl":"10.1049/hve2.12368","url":null,"abstract":"Computational screening of single gases to replace SF6 for electrical insulation has been challenged by the difficulty in combining various mutually exclusive properties especially for dielectric performance with liquefaction and environmental properties. To reveal the inherent correlations between dielectric strength (Er), boiling point (Tb), and global warming potential (GWP) of dielectric materials, a coupled structure-activity relationship (CSAR) model has been proposed for the first time. By means of the generic descriptors, as deduced from the electrostatic potentials, and the specific descriptors, as introduced from the respective microscopic mechanisms, the complex interdependence between Er, Tb, and GWP of the insulation gases is quantitatively characterised by the 3-D coupling matrix. The coupling mechanism for the right balance of properties is uncovered in terms of the first-principle descriptors. The CSAR model outperforms the previous SAR models in predicting Er, Tb, and GWP simultaneously in a self-consistent manner. More importantly, the concept of CSAR could be extended readily to any multidimensional macroscopic properties. Novel replacement compounds have been identified tentatively to be the promising candidates to replace SF6 using the CSAR model.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12368","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42756874","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

KH550-SiO2/polyimide insulating paper preparation and characterisation KH550‐SiO2/聚酰亚胺绝缘纸的制备和表征

IF 4.4 2区工程技术

High Voltage Pub Date : 2023-08-25 DOI: 10.1049/hve2.12365

Minghe Chi, Xue Sun, Xiaorui Zhang, Jiahao Shi, Ling Weng, Yang Yu

{"title":"KH550-SiO2/polyimide insulating paper preparation and characterisation","authors":"Minghe Chi, Xue Sun, Xiaorui Zhang, Jiahao Shi, Ling Weng, Yang Yu","doi":"10.1049/hve2.12365","DOIUrl":"10.1049/hve2.12365","url":null,"abstract":"Oil-paper insulation material is an essential component for oil-filled transformers, and polyimide (PI) insulation paper is a novel material in the field of electricity. The improvement of insulation class for insulation paper has gained significant attention in recent years. In this study, SiO2 nanoparticles were modified with a silane coupling agent (KH550), and the KH550-SiO2 was added to the fibre membrane through in situ polymerisation. The chemical composition and microcosmic characteristics of the PI porous fibre membrane were characterised using FT-IR and SEM FT-IR and SEM. Consequently, the dielectric constant of the composite paper was reduced to 2.3 upon adding 3 wt% of KH550-SiO2, and the dielectric strength reached its maximum value of 85 kV/mm. The results demonstrate that the insulation performance of the KH550-SiO2/PI composite was significantly improved due to the incorporation of nano-SiO2. This establishes an efficient approach for achieving excellent electrical and thermal properties in practical applications using the KH550-SiO2/PI fibre membrane.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12365","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48006510","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