IEEE Transactions on Dielectrics and Electrical Insulation最新文献_第2页

AC Surface Flashover Characteristics at the Clear Edge of Metallized Polypropylene Film Capacitors 金属化聚丙烯薄膜电容器透明边缘交流表面闪络特性

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-03-13 DOI: 10.1109/TDEI.2025.3550912

Zijian Wang;Yiming Lei;Fei Yan;Lin Yang;Zichen Wang;Yanfeng Ma

{"title":"AC Surface Flashover Characteristics at the Clear Edge of Metallized Polypropylene Film Capacitors","authors":"Zijian Wang;Yiming Lei;Fei Yan;Lin Yang;Zichen Wang;Yanfeng Ma","doi":"10.1109/TDEI.2025.3550912","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3550912","url":null,"abstract":"Surface flashover significantly affects the insulation performance of metallized film capacitors (MFCs), and the clear edge is the main area where the surface flashover occurs. An experimental platform is built to study ac surface flashover at the clear edge of metallized polypropylene film capacitors. The effects of interlayer pressure, experiment temperature, clear edge width, square resistance, absolute humidity, and voltage frequency on the ac surface flashover of metallized films are investigated. The results indicate that the surface flashover voltage and field strength increase with the increase of interlayer pressure in the range of 100–800 kPa and decrease with the increase of experiment temperature in the range of <inline-formula> <tex-math>$30~^{circ }$ </tex-math></inline-formula>C–<inline-formula> <tex-math>$90~^{circ }$ </tex-math></inline-formula>C; the flashover field strength decreases by 44% and gradually tends to be stable as the clear edge width varies from 0.5 to 2.5 mm; the surface flashover voltage and field strength increase by 78% as the square resistance increases from 7.5 to <inline-formula> <tex-math>$50~Omega $ </tex-math></inline-formula>/<inline-formula> <tex-math>$Box $ </tex-math></inline-formula>; the surface flashover voltage increases with the increase of absolute humidity in the range of 4–16 g/m3; the surface flashover voltage and field strength decrease by 4% with the increase of voltage frequency in the range of 50–400 Hz. In the design and manufacture of MFCs, the interlayer pressure of outer films should be appropriately increased; the design of the clear edge width of MFCs with different square resistance, operating temperatures, and voltage frequencies can be selected according to the experimental results of this article. Since the moisture will be removed by heating and vacuumizing in the capacitor manufacturing process, the design of the clear edge width could refer to the experimental results under low humidity.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 3","pages":"1305-1313"},"PeriodicalIF":2.9,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Ultrathin Films of Liquid Crystal Obtained via Organic Molecular Beam Deposition Method 有机分子束沉积法制备超薄液晶薄膜

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-02-26 DOI: 10.1109/TDEI.2025.3546175

Anna Drzewicz;Michael Wübbenhorst

引用次数: 0

Benzydamine-Loaded Casein Nanospheres Embedded in Polyelectrolyte Multilayers 聚电解质多层包埋的苯胺负载酪蛋白纳米球

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-02-24 DOI: 10.1109/TDEI.2025.3542349

Asya Viraneva;Maria Marudova;Bissera Pilicheva;Aleksandar Grigorov;Nikolay Zahariev;Sofia Milenkova;Temenuzhka Yovcheva

引用次数: 0

Characteristic of Surface Streamer Discharge Under the AC–DC Composite Voltage 交直流复合电压下表面流线型放电特性研究

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-02-19 DOI: 10.1109/TDEI.2025.3543792

Xiaobo Meng;Lin Lin;Hao Li;Hongwei Mei;Liming Wang

引用次数: 0

Mechanisms for DC Breakdown Strength Degradation in Epoxy/Glass Fiber Composites Under Long-Term Aging 环氧/玻璃纤维复合材料长期老化下直流击穿强度下降的机理

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-02-19 DOI: 10.1109/TDEI.2025.3543794

Ji Liu;Pengfei Wang;Chao Zhang;Zuning Huang;Longfei Zhang;Zhen Li

{"title":"Mechanisms for DC Breakdown Strength Degradation in Epoxy/Glass Fiber Composites Under Long-Term Aging","authors":"Ji Liu;Pengfei Wang;Chao Zhang;Zuning Huang;Longfei Zhang;Zhen Li","doi":"10.1109/TDEI.2025.3543794","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3543794","url":null,"abstract":"In modern power systems, the proportion of epoxy/glass fiber (EP/GF) composites that served as the primary insulation composites in electrical equipment is steadily increasing. These devices suffer long-term electrical, thermal, and vibrational stresses during operation, leading to degradation and finally insulation failures. However, the underlying electrical-thermal–vibrational aging mechanisms of the dc breakdown performance of EP/GF composites remain unclear. In this work, combined electrical-thermal–vibrational aging experiments (1080 h) were performed on the prepared EP/GF composites. Infrared spectrum, dielectric spectrum, surface potential decay (SPD), and breakdown tests were used to characterize the functional groups, side-chain dynamics, trap levels, and dc breakdown strength of aged EP/GF composites. The research indicates that after long-term aging, the dc breakdown strength of EP/GF composites first increases by 5.8% at 72 h and then decreases by 20.6% at 1080 h. The aging of EP/GF composites is divided into recrosslinking and degradation stages. The recrosslinking stage enhances the dc breakdown strength of the EP/GF composites by reducing free volume before 72 h. While in the degradation stage, chain breaking and oxidation of epoxy chains steadily occur, introducing abundant short chains and polar groups (carbonyl and ester groups), improving free volume fraction, and accelerating chains’ dynamic. The improved free volume fraction accelerates electron avalanche in the electric field, stimulating charges to escape from traps and causing dc breakdown strength to considerably decrease during 72–1080 h.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 3","pages":"1498-1507"},"PeriodicalIF":2.9,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Analytical Model for Transient Space Charge in Low-Density Polyethylene 低密度聚乙烯中瞬态空间电荷的解析模型

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-02-13 DOI: 10.1109/TDEI.2025.3541613

Purnabhishek Muppala;C. C. Reddy

{"title":"Analytical Model for Transient Space Charge in Low-Density Polyethylene","authors":"Purnabhishek Muppala;C. C. Reddy","doi":"10.1109/TDEI.2025.3541613","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3541613","url":null,"abstract":"Despite being an experimentally well-studied phenomena, a consistent lacuna has always persisted in the theoretical and mathematical understanding of space charge dynamics in low-density polyethylene (LDPE). The macroscopic models reported so far in the literature seem to be insufficient and fail to predict the formation of homo- and hetero-charges near the electrodes and transport of charge packets. On the other hand, while microscopic models such as bipolar charge transport (BCT) model were able to explain homo-charge accumulation and movement of charge packets to a limited success, they are often fraught with assumptions such as neglection of diffusion phenomena and are structurally complicated when compared to macroscopic models. In this work, the authors have derived analytical solutions for space charge dynamics based on Maxwell’s equations and transient space charge limited current (TSLC)-based volumetric current models, which take into consideration the measured absorption (slow polarization) and steady-state volumetric currents. The proposed analytical (macroscopic) model can thus predict the homo- and hetero-charge accumulation in LDPE, which is validated through comparisons with the experimentally measured space charge, wherein a remarkable agreement was observed. Furthermore, the relation between the transient volumetric current and space charge dynamics is reaffirmed.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 3","pages":"1567-1574"},"PeriodicalIF":2.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Enhancing Insulator String Performance: Pollution and Icing Flashover Analysis Through Artificial Neural Network-Based Layout Optimization for Inverted T-Type String 提高绝缘子串性能：基于人工神经网络的倒t型串布局优化污染和覆冰闪络分析

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-02-13 DOI: 10.1109/TDEI.2025.3542009

Mahmoud A. Ali;Xingliang Jiang;Salah Kamel;Asad Awan

{"title":"Enhancing Insulator String Performance: Pollution and Icing Flashover Analysis Through Artificial Neural Network-Based Layout Optimization for Inverted T-Type String","authors":"Mahmoud A. Ali;Xingliang Jiang;Salah Kamel;Asad Awan","doi":"10.1109/TDEI.2025.3542009","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3542009","url":null,"abstract":"This study explores the impact of various high-voltage insulator string configurations on pollution and icing flashover characteristics under different environmental conditions. The inverted T-string design is suggested, offering improvements over the traditional I-string configuration. An experimental investigation is conducted using high-voltage glass-type disks (LD-160), along with the development of two artificial neural network (ANN) models to simulate and predict flashover voltages. The results demonstrate that the inverted T-string arrangement enhances the flashover voltage for polluted insulator strings by approximately 7% and increases the icing flashover voltage by 3.43%–5.01% compared to standard I-strings. The ANN models successfully determine optimal insulator configurations, demonstrating their potential to enhance high-voltage insulation performance with minimal experimentation. This study emphasizes the innovative use of ANN in optimizing insulator string arrangements, providing a practical solution for tackling pollution and icing issues in power systems.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 3","pages":"1653-1659"},"PeriodicalIF":2.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Dependence Mapping of the Static Electric Field Distribution Characteristics to Dielectric Strength of Long Air Gap Based on Random Forest 基于随机森林的长气隙电场分布特性与介电强度的关系映射

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-02-11 DOI: 10.1109/TDEI.2025.3540773

Zhibin Qiu;Yu Song;Wenhao Chen;Zijian Wu

{"title":"Dependence Mapping of the Static Electric Field Distribution Characteristics to Dielectric Strength of Long Air Gap Based on Random Forest","authors":"Zhibin Qiu;Yu Song;Wenhao Chen;Zijian Wu","doi":"10.1109/TDEI.2025.3540773","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3540773","url":null,"abstract":"To evaluate the dielectric strength of a long air gap under a positive 250/<inline-formula> <tex-math>$2500~mu $ </tex-math></inline-formula>s impulse waveform, various parameters should be taken into account, among which the electric field (EF) is the most important. This article proposes a random forest (RF) model to construct the dependence mapping from the static EF distribution characteristics of long air gaps to their dielectric strengths. Forty interelectrode features were adopted to describe the EF distribution of an air gap and their correlation degrees with the 50% discharge voltages were analyzed. A high-quality feature subset was input to train the RF model with some limited discharge test data. The dielectric strengths of large-size sphere-plane long air gaps, which are used in valve hall, were forecast by the RF model, and the results show a mean absolute percentage error (MAPE) of only 2.0% for 17 samples. The model was also extrapolated to the grading ring and cap to ground gaps, and the predicted dielectric strengths have similar variation trend with the experimental values. This study can provide references for insulation distance selection of shield fittings in converter station or substations.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 3","pages":"1271-1278"},"PeriodicalIF":2.9,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Generating Method for UHF Maps of Epoxy Surface Discharge Based on the Multiscale Simulation System 基于多尺度仿真系统的环氧表面放电超高频图生成方法

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-02-07 DOI: 10.1109/TDEI.2025.3540000

Zhaoqi Zhang;Hui Song;Jiejie Dai;Lingen Luo;Gehao Sheng;Xiuchen Jiang

{"title":"A Generating Method for UHF Maps of Epoxy Surface Discharge Based on the Multiscale Simulation System","authors":"Zhaoqi Zhang;Hui Song;Jiejie Dai;Lingen Luo;Gehao Sheng;Xiuchen Jiang","doi":"10.1109/TDEI.2025.3540000","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3540000","url":null,"abstract":"The ultrahigh-frequency (UHF) maps are often used as an important basis to evaluate the insulation status. However, the current research is mostly driven by pure data, making it difficult to judge the actual status of defects through UHF maps. Multiscale simulation technologies are adopted to simulate the UHF maps of surface defects from physical mechanisms. The microprocess of surface discharge is simulated using the plasma model, and the electromagnetic (EM) signal amplitudes are calculated based on the finite-difference time-domain (FDTD) method, using the current in the microsimulation as an excitation. Then, the segmented equivalent parameters of the circuit model are solved using the microsimulation results. The phases of the UHF pulses are simulated in the circuit model, and the UHF maps are obtained combined with the signal amplitude. It is found that the undischarged segment resistance determines the voltage recovery time, which is a key parameter that affects the UHF maps. The random settings of the simulation are important factors making the simulation results more reasonable. The relationship between the microprocess of surface discharge and the UHF maps is established theoretically, providing a basis for the accurate assessment of the insulation defect status of power equipment.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"859-868"},"PeriodicalIF":2.9,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Evidently Retarded Degradation in Breakdown Strength of Polypropylene Eco-Friendly Cable Insulation From Trace Self-Grown γ-Crystals During Thermal Aging 在热老化过程中，微量自生长γ-晶体明显延缓聚丙烯环保电缆绝缘击穿强度的降低

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-02-07 DOI: 10.1109/TDEI.2025.3540004

Kangning Wu;Haoran Sui;Yongruo Ren;Kai Yang;Peng Zhao;Benhong Ouyang;Huan Li;Xu Zhang;Li Ran;Jianying Li

{"title":"Evidently Retarded Degradation in Breakdown Strength of Polypropylene Eco-Friendly Cable Insulation From Trace Self-Grown γ-Crystals During Thermal Aging","authors":"Kangning Wu;Haoran Sui;Yongruo Ren;Kai Yang;Peng Zhao;Benhong Ouyang;Huan Li;Xu Zhang;Li Ran;Jianying Li","doi":"10.1109/TDEI.2025.3540004","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3540004","url":null,"abstract":"Recyclable thermoplastic polypropylene (PP) cable insulation with excellent performances is expected to represent traditional thermoset cross-linked polyethylene (XLPE) insulation. However, the poor resistance to thermal aging of PP-based cable insulation is generally considered as an obstacle limiting their practical applications. In this article, trace self-grown <inline-formula> <tex-math>$gamma $ </tex-math></inline-formula>-crystals of PP were accidentally found in impact PP copolymer (IPC) cable insulation during thermal aging, which evidently retarded degradation in breakdown strength caused by decline in crystallinity. The unexpected growth of <inline-formula> <tex-math>$gamma $ </tex-math></inline-formula>-crystals is further proven to be facilitated by crystalline ethylene segments from rubber phases and those blocked in PP chains. As a result, more deep traps are introduced by <inline-formula> <tex-math>$gamma $ </tex-math></inline-formula>-crystals that are presented as crystalline structure defects. It makes carriers in IPC more difficult to migrate and detrap under external electric field. Therefore, although the crystallinity, which determines the breakdown strength of semi-crystalline polymers, decreases at day 12 of thermal aging, the degradation in breakdown strength is delayed until day 24. The self-grown <inline-formula> <tex-math>$gamma $ </tex-math></inline-formula>-crystals in IPC insulation thus achieve the self-protective resistance against thermal aging. This work provides a new understanding to the effect of elastomers on thermal-aging stability in PP-based eco-friendly power cable insulation.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"815-822"},"PeriodicalIF":2.9,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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