High Voltage最新文献_第10页

Thermal runaway and induced electrical failure of epoxy resin in high-frequency transformers: Insulation design reference 高频变压器中环氧树脂的热失控和诱发电气故障：绝缘设计参考

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-03-11 DOI: 10.1049/hve2.12424

Xingyu Shang, Lei Pang, Qinhao Bu, Qiaogen Zhang

{"title":"Thermal runaway and induced electrical failure of epoxy resin in high-frequency transformers: Insulation design reference","authors":"Xingyu Shang, Lei Pang, Qinhao Bu, Qiaogen Zhang","doi":"10.1049/hve2.12424","DOIUrl":"10.1049/hve2.12424","url":null,"abstract":"Solid-state transformers (SSTs) have applications in medium-voltage direct current (MVDC) grids and compact power systems. High-frequency transformer (HFT) is the core component of SSTs. High levels of high frequency high dv/dt voltage stresses challenged the integrity of the galvanic insulation of HFTs. However, dielectric thermal runaway and resultant electrical failure mechanisms in epoxy resin (EP) cast insulation remain unclear. Dielectric heating of EP across varying voltages, frequencies, rising edges, duty cycles and DC biases were measured and corroborated by simulation. The thermal runaway threshold mainly depends on the tangency point of the loss generation and heat dissipation curves below the glass transition temperature. Observations reveal that thermal runaway does not directly cause breakdown; instead, thermal decomposition above 200°C triggers discharge and eventual failure. Simulations demonstrate that temperature rise mainly depends on the average field within the electrode region and inter-segment and inter-layer distances within the HFT winding definitively impact insulation thermal runaway. By applying different criteria for MV and high-voltage (HV) transformers, the reference electric fields for insulation design with unfilled and filled EP were obtained. For instance, limiting dielectric heating below 5 K at 50 kHz necessitates an RMS average field less than 0.44 V/mm, which is much lower than dry-type transformer conventions. The authors prove the necessity of re-evaluating the permissible field strength in HFT insulation design.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"9 5","pages":"989-1000"},"PeriodicalIF":4.4,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12424","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140253693","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

Experimental and numerical study on atmospheric-pressure air dielectric barrier discharge via 50 Hz/5000 Hz dual-frequency excitation 通过 50 赫兹/5000 赫兹双频激励对大气压空气介质阻挡层放电的实验和数值研究

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-02-21 DOI: 10.1049/hve2.12401

Junwen He, Bangfa Peng, Guanglin Yu, Ronggang Wang, Nan Jiang, Jie Li, Yan Wu

{"title":"Experimental and numerical study on atmospheric-pressure air dielectric barrier discharge via 50 Hz/5000 Hz dual-frequency excitation","authors":"Junwen He, Bangfa Peng, Guanglin Yu, Ronggang Wang, Nan Jiang, Jie Li, Yan Wu","doi":"10.1049/hve2.12401","DOIUrl":"10.1049/hve2.12401","url":null,"abstract":"A dual-frequency (DF) dielectric barrier discharge, excited by the superposition of a 50 Hz low frequency (LF) and a 5000 Hz intermediate frequency (IF), is proposed to enhance discharge. The effect of the LF voltage component on the breakdown behaviour of the DF discharge during different periods has been studied both experimentally and numerically. The number of high-current pulses rises as the LF voltage increases. The statistical analysis shows that the number of the current pulse amplitude above 80 mA in the DF discharge reaches nearly 6 times that in the IF discharge. Additionally, the total discharge energy in the DF discharge is significantly higher than that in the IF discharge. The simulation reproduces the temporal variation of the breakdown behaviours in the DF discharge. The simulated results reveal that the maximal electric field strength of the breakdown process is greater in the DF discharge compared to the IF discharge during a half-period of DF. Finally, the comparison between the IF and DF discharges exhibits that the LF voltage regulates the accumulation of residual charged species on the dielectric surface after the breakdown by modulating the residual voltage between the air gap.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"9 2","pages":"391-402"},"PeriodicalIF":4.4,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12401","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139943556","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

Electrical tree degradation of MgO/epoxy resin composites at different voltage frequencies 不同电压频率下氧化镁/环氧树脂复合材料的电树降解

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-02-19 DOI: 10.1049/hve2.12407

Yunxiao Zhang, Wenxin Lin, Yuanxiang Zhou, Weiwei Xing, Jiayu Cheng, Chenyuan Teng

引用次数: 0

A fast and high‐accurate commutation failure identification method for LCC‐HVDC system 用于 LCC-HVDC 系统的快速、高精度换向故障识别方法

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-02-12 DOI: 10.1049/hve2.12400

Jing Feng, Zhijie Liu, Kejun Li, Bingkun Li, Jiachen Li, Liangzi Li

{"title":"A fast and high‐accurate commutation failure identification method for LCC‐HVDC system","authors":"Jing Feng, Zhijie Liu, Kejun Li, Bingkun Li, Jiachen Li, Liangzi Li","doi":"10.1049/hve2.12400","DOIUrl":"https://doi.org/10.1049/hve2.12400","url":null,"abstract":"Commutation failure (CF) is one of the most common issues in line‐commuted converter‐based high voltage direct current systems (LCC‐HVDC), leading to critical power system security and stability problems. Accurate and rapid identification of CF is crucial to prevent subsequent CF in HVDC systems. However, the existing CF identification methods are lack of the required accuracy and speed. The relationship between bridge arm current, commutation voltage, and trigger pulse based on the commutation progress mechanism after the AC fault is analysed in this paper. A novel CF identification method is presented, which utilises the CF identification factor, enabling fast and high‐accurate identification without relying on the value of the extinction angle. The proposed method offers a simpler and more efficient implementation in engineering practice. Finally, the effectiveness of the proposed method is verified in both the standard International Council on Large Electric systems HVDC model and the Hardware in Loop test using practical project parameters. The results demonstrate that the proposed method can accurately and fast identify CF.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"70 38","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139843826","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

A fast and high-accurate commutation failure identification method for LCC-HVDC system 用于 LCC-HVDC 系统的快速、高精度换向故障识别方法

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-02-12 DOI: 10.1049/hve2.12400

Jing Feng, Zhijie Liu, Kejun Li, Bingkun Li, Jiachen Li, Liangzi Li

{"title":"A fast and high-accurate commutation failure identification method for LCC-HVDC system","authors":"Jing Feng, Zhijie Liu, Kejun Li, Bingkun Li, Jiachen Li, Liangzi Li","doi":"10.1049/hve2.12400","DOIUrl":"10.1049/hve2.12400","url":null,"abstract":"Commutation failure (CF) is one of the most common issues in line-commuted converter-based high voltage direct current systems (LCC-HVDC), leading to critical power system security and stability problems. Accurate and rapid identification of CF is crucial to prevent subsequent CF in HVDC systems. However, the existing CF identification methods are lack of the required accuracy and speed. The relationship between bridge arm current, commutation voltage, and trigger pulse based on the commutation progress mechanism after the AC fault is analysed in this paper. A novel CF identification method is presented, which utilises the CF identification factor, enabling fast and high-accurate identification without relying on the value of the extinction angle. The proposed method offers a simpler and more efficient implementation in engineering practice. Finally, the effectiveness of the proposed method is verified in both the standard International Council on Large Electric systems HVDC model and the Hardware in Loop test using practical project parameters. The results demonstrate that the proposed method can accurately and fast identify CF.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"9 3","pages":"721-732"},"PeriodicalIF":4.4,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12400","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139784145","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 novel multi-slice electromagnetic field-circuit coupling method for transient computation of long-distance gas-insulated transmission lines 用于长距离气体绝缘输电线路瞬态计算的新型多切片电磁场-电路耦合方法

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-02-07 DOI: 10.1049/hve2.12420

Shucan Cheng, Yanpu Zhao, Kejia Xie, Bin Hu

{"title":"A novel multi-slice electromagnetic field-circuit coupling method for transient computation of long-distance gas-insulated transmission lines","authors":"Shucan Cheng, Yanpu Zhao, Kejia Xie, Bin Hu","doi":"10.1049/hve2.12420","DOIUrl":"10.1049/hve2.12420","url":null,"abstract":"Accurate calculation of short-circuit electromagnetic force is crucial for both mechanical strength check and the optimal design of gas-insulated transmission lines (GIL). Since the full 3D numerical simulation method is highly time-consuming, a novel lightweight 2D multi-slice electromagnetic field-circuit coupled method for computing transient electromagnetic force is proposed, where appropriate port voltage degrees of freedom (DoFs) are introduced for the solid GIL conductor terminals. When the transient magnetic field equations are combined with the constraint equations of circuit part, including nodal voltage and loop current DoFs, a direct field-circuit coupling scheme is thus derived. The proposed method can simultaneously consider the effect of interphase-shunts and ground wires, as well as the skin effect and proximity effect. It can accurately capture the transient electromagnetic characteristics of GIL spanning from several to tens of kilometers under different short-circuit conditions. The transient electromagnetic forces, as well as the induced voltages and currents of the enclosure, are analysed by the proposed method for both single-phase and three-phase enclosed GIL under various short-circuit conditions. The proposed method has the advantages of high accuracy and lightweight computational cost, and thus it is also suitable for conducting important simulation tasks such as mechanical strength checks during the design optimisation phase of long-distance GIL.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"9 4","pages":"826-838"},"PeriodicalIF":4.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12420","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139701073","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

Modelling and simulation study on dynamic pollution accumulation process of composite insulator 复合绝缘体动态污染积累过程的建模与仿真研究

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-02-05 DOI: 10.1049/hve2.12413

Zhongyi Yang, Dongxiong Liu, Xiangjun Zeng, Caijin Fan, Xin Yang, Yafei Huang

{"title":"Modelling and simulation study on dynamic pollution accumulation process of composite insulator","authors":"Zhongyi Yang, Dongxiong Liu, Xiangjun Zeng, Caijin Fan, Xin Yang, Yafei Huang","doi":"10.1049/hve2.12413","DOIUrl":"10.1049/hve2.12413","url":null,"abstract":"With the widespread application of composite insulators in transmission lines, exploring the accumulation mechanism of pollution particles on composite insulator surfaces is of importance to ensure the safe and steady operation of the power system. Addressing the current theoretical shortcomings, this study categorises the accumulation process of particles on the insulator surface into three stages, namely ‘spatial motion’, ‘surface collision’, and ‘surface motion’. The motion and rotation velocities in a multi-physics field are calculated in the spatial motion stage. In the surface collision stage, a parameter called ‘neck height’ is introduced to determine the optimum mechanics theory, and the normal deposition criterion is established. For the surface motion stage, the sliding displacement and rolling displacement on the surface are calculated based on the rotation speed of the particles. A dynamic pollution accumulation model of the composite insulator is established based on the normal deposition criterion and tangential displacement. Finally, numerical simulations are performed by using the finite element method. Simulation results show that the proposed model agrees with the actual insulator pollution accumulation, and the deposition model is still applicable for various types of composite insulators operating in different applied voltages. The deposition probability of particles increases with the increasing particle size. In the surface motion stage, particle displacement increases with particle size and wind velocity.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"9 3","pages":"601-613"},"PeriodicalIF":4.4,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12413","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139696320","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

3D electromagnetic modelling for high-temperature superconducting dynamo flux pumps using T-A formulation 利用 T-A 公式建立高温超导动力通量泵的三维电磁建模

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-02-03 DOI: 10.1049/hve2.12406

Luning Hao, Fangliang Dong, Jintao Hu, Qi Wang, Haigening Wei, Ismail Patel, Adil Shah, Yuyang Wu, Tim Coombs

{"title":"3D electromagnetic modelling for high-temperature superconducting dynamo flux pumps using T-A formulation","authors":"Luning Hao, Fangliang Dong, Jintao Hu, Qi Wang, Haigening Wei, Ismail Patel, Adil Shah, Yuyang Wu, Tim Coombs","doi":"10.1049/hve2.12406","DOIUrl":"10.1049/hve2.12406","url":null,"abstract":"A high-temperature superconducting (HTS) dynamo flux pump can inject DC currents into closed-loop HTS magnets without contact. It enables the realisation of current-lead-free or even through-wall charging systems for high-field applications such as nuclear magnetic resonance/magnetic resonance imaging (MRI) magnets, fusion reactors and accelerators. Researchers have proposed many simulation models to understand the working principle of HTS dynamos, few of which are in 3D because of converging problems. Therefore, the influences of many key 3D parameters in the HTS dynamo are scarcely reported. The authors propose an efficient 3D modelling method of the HTS dynamo based on the T-A formulation. The rotating magnets are modelled by a ring-shaped permanent magnet with space-time-variant remanent flux density to avoid moving meshes. This, together with the T-A formulation, makes the 3D model efficient and universal. The accuracy of the model is verified by the experimental instantaneous and time-integrated dynamic voltages. Using this model, the authors present systematic case studies to thoroughly explore the influences of the key parameters of a dynamo flux pump on the dynamic voltage and losses. The proposed modelling method and results could significantly benefit the design and optimisation of HTS dynamos for high-field magnets.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"9 2","pages":"367-379"},"PeriodicalIF":4.4,"publicationDate":"2024-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12406","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139701098","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

Prediction of dissolved gas content in transformer oil based on multi-information fusion 基于多信息融合的变压器油中溶解气体含量预测

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-01-29 DOI: 10.1049/hve2.12408

Tongliang Yang, Yun Fang, Chengming Zhang, Chao Tang, Dong Hu

{"title":"Prediction of dissolved gas content in transformer oil based on multi-information fusion","authors":"Tongliang Yang, Yun Fang, Chengming Zhang, Chao Tang, Dong Hu","doi":"10.1049/hve2.12408","DOIUrl":"10.1049/hve2.12408","url":null,"abstract":"In order to accurately predict the content and variation trend of dissolved gas in transformer oil and guide the condition maintenance of power transformers, a combined prediction model based on multi-information fusion is proposed and its effectiveness is analysed. First of all, based on the possibility of pathological and missing historical sample data, a detection and filling method based on variable weight combination samples is established. Second, the authors propose two models. Aiming at the non-linear and non-stationary characteristics of gas content, a univariate decomposition prediction mode HBA-VMD-TCN which based on the Honey Badger algorithm, variational mode decomposition and time convolutional network (TCN) is established. Then the multivariate Informer prediction model is established for gas content affected by multiple variables. Third, the cross-entropy theory is used to determine the weight coefficients of the two models, and the multi-information fusion combined prediction model is formed. Finally, on the basis of the above, a method to determine the time step and the position information of the transition point adaptively in the process of prediction is proposed to further improve the prediction accuracy. The results show that, through a series of simulation experiments of model comparison and transformer anomaly prediction, the accuracy and effectiveness of the combined prediction model are verified.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"9 3","pages":"685-699"},"PeriodicalIF":4.4,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12408","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139696322","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

Editorial: The development of eco-friendly insulating gases and SF6-free equipment for ‘net-zero’ 社论：开发环保绝缘气体和不含 SF6 的设备，实现 "零净排放

IF 4.4 2区工程技术

High Voltage Pub Date : 2024-01-29 DOI: 10.1049/hve2.12423

Song Xiao, Yi Li, Ju Tang, Xiaoxing Zhang

{"title":"Editorial: The development of eco-friendly insulating gases and SF6-free equipment for ‘net-zero’","authors":"Song Xiao, Yi Li, Ju Tang, Xiaoxing Zhang","doi":"10.1049/hve2.12423","DOIUrl":"10.1049/hve2.12423","url":null,"abstract":"Developing low-carbon gas insulated transmission and distribution equipment is essential to achieve the ‘carbon peak, carbon neutralisation’ or ‘net-zero’ in the power industry. Scholars have carried out various research on the eco-friendly insulating gas (such as C4F7N, C5F10O) and next-generation SF6-free equipment to gradually reduce the utilisation of strong greenhouse gas SF6.The cover of this issue is inspired by the allusions of the “Year Beast” in Chinese traditional culture. It is said that in ancient times, every New Year's Eve there would be a murderous “Year Beast” attacking the world, and the people drove it away with firecrackers. These habits have gradually become the customs of the New Year. Coinciding with the Chinese Lunar New Year, the authors compare the “discharge” that threatens the safety of gas insulated equipment to the “Year Beast”. The traditional insulating gas SF6 incarnates as an ‘immortal’ to protect the insulation safety of equipment for a long time. However, due to the greenhouse effect of SF6, its use is gradually limited. At the same time, the eco-friendly insulating gas is like the ‘pupil’ that gradually jointly resist the discharge with SF6 to ensure the safe and stable operation of power equipment.In the future, the development of eco-friendly insulating gases and SF6-free equipment will further ensure the safety of the power grid and protect the lights of all households. On the occasion of the Spring Festival, we wish all scholars and readers a happy New Year!","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"9 1","pages":"1"},"PeriodicalIF":4.4,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12423","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139696313","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