IEEE Transactions on Dielectrics and Electrical Insulation最新文献

{"title":"Partial Discharge Pattern Recognition Method Based on SIFT-BOVF and Siamese-VGG With Limited Training Samples for Generator Stator","authors":"Hongyu Wang;Mengqi Li;Xiaosheng Peng;Yuzhu Chen;Tao Liu;Peng Ling;Jin Zhou;Yue Zhang","doi":"10.1109/TDEI.2025.3597605","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3597605","url":null,"abstract":"Accurate pattern recognition under conditions of limited training samples is a significant challenge in partial discharge (PD) detection for generators. To address this issue, a novel method based on scale-invariant feature transform (SIFT)-bag-of-visual feature (BOVF) and Siamese visual geometry group (Siamese-VGG) is proposed for PD pattern recognition under limited training samples conditions. First, phase-resolved PD (PRPD) samples of different defects are collected from laboratory experiments to construct an imbalanced sample set. The dataset includes both abundant and limited samples, used for training the Siamese-VGG model. Next, SIFT features are extracted from the imbalanced samples to construct a BOVFs model. A sample retrieval process is then applied to identify samples similar to the target. Finally, the similarity between samples is computed using a shared loss function within the Siamese-VGG framework, enabling accurate PD pattern recognition. The experimental results demonstrate that the proposed SIFT-BOVF and Siamese-VGG approach achieves superior classification accuracy compared to other models under limited training sample conditions. When the limited training sample set contains only five training samples, the proposed method achieves a recognition accuracy of 93.20%, significantly enhancing the accuracy of generator PD pattern recognition under imbalanced sample conditions.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"33 2","pages":"1480-1489"},"PeriodicalIF":3.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147584910","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}

{"title":"Influence of Electrical–Thermal Aging to the Bar-to-Bar Discharge on the End Winding of HV Motors","authors":"Ailiang Kang;Lingyan Lin;Zhanqing Chen;Bangfa Peng;Lu Li;Libing Zhang;Shijie Zhao;Kaiyan Fu;Wei Li","doi":"10.1109/TDEI.2025.3590314","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3590314","url":null,"abstract":"The space left between adjacent coils on the end winding can become inadequate during the operation of high-voltage (HV) motors due to mechanical vibration or other factors, which can lead to bar-to-bar discharge in the small air gap between two adjacent coils and gradually develop into phase-to-phase or phase-to-ground failures. In addition, the inadequate spacing can also result in poor heat dissipation, causing excessive temperature rise in the winding and further accelerating the insulation failure process. To better understand the development of bar-to-bar discharge, an accelerated aging experiment was conducted on two stator coils under well-controlled thermal and electrical stresses. The partial discharge (PD) was collected, and the characteristics of phase-resolved PD (PRPD) patterns were analyzed along with periodic visual inspection of the insulation surface. It was observed that bar-to-bar discharge always gives rise to constant amplitude during both half-cycles of the voltage. Furthermore, the PD distribution changes from a “strip-like” shape to a “rabbit-like” and “turtle-like” shape as aging progresses. The PD inception phase shifts forward, approaching the zero crossings of the positive and negative half-cycles, while PD parameters show an increasing trend with aging. In addition, corona discharge and surface discharge appear and gradually become the dominant discharge types. The research in this article is devoted to providing a reference for PD monitoring and fault diagnosis of HV motors.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"33 2","pages":"1539-1546"},"PeriodicalIF":3.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147584929","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}

{"title":"Impact of Accelerated Shock on Partial Discharge Characteristics at the Oil-Paper Insulation Interface of Transformers","authors":"Longjiang Wei;Yongqiang Kang;Yanyan Bao;Kang Liu;Zhichen Liu;Siqi Zheng;Jinlei Huo;Shuaibing Li","doi":"10.1109/TDEI.2025.3624190","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3624190","url":null,"abstract":"The variation in pressure distribution at the oil-paper insulation interface of transformers under shock conditions leads to an enhancement of partial discharge, posing severe challenges to the reliability of transformer oil-paper insulation. In this study, an experimental platform for partial discharge testing at the oil-paper insulation interface under accelerated shock is established to investigate the partial discharge characteristics at different acceleration levels. The experimental results reveal that compared with the zero-acceleration condition, accelerated shock significantly intensifies partial discharge at the oil-paper interface. With an acceleration of 10 m/s², the average discharge magnitude for the wire-plate electrode increases by 43.2%, while that for the needle-plate electrode increases by 20.0%. Both partial discharge magnitude and discharge frequency are observed to increase markedly with increasing acceleration. Furthermore, based on Comsol Multiphysics, a fluid–structure interaction (FSI) model of the oil-paper insulation under accelerated shock is constructed. The simulation results indicate that accelerated shock induces fluctuations in the pressure distribution at the oil-paper interface, which alters the microbubble layer formation process and changes the number density of gas molecules at the interface. When the acceleration direction is negative, the pressure of the microbubble layer decreases, the solubility of gas reduces, and the bubble volume expands, resulting in an increased average free path of electrons and thus enhanced partial discharge. During cyclic positive and negative acceleration shocks, negative-direction acceleration is found to play a dominant role in promoting partial discharge at the oil-paper interface, thereby further aggravating the partial discharge process. This study can provide a reference for insulation design and protection of transformers under impact conditions.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"33 2","pages":"1519-1528"},"PeriodicalIF":3.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147584898","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}

{"title":"Corrections to “On the Frequency Dependence of the PDIV in Twisted Pair Magnet Wire Analogy in Dry Air”","authors":"Ondřej Šefl;Raphael Färber;Christian M. Franck","doi":"10.1109/TDEI.2025.3639843","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3639843","url":null,"abstract":"Presents corrections to the paper, Corrections to “On the Frequency Dependence of the PDIV in Twisted Pair Magnet Wire Analogy in Dry Air”.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"33 1","pages":"780-780"},"PeriodicalIF":3.1,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11371455","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146102969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IEEE Transactions on Dielectrics and Electrical Insulation Information for Authors","authors":"","doi":"10.1109/TDEI.2026.3651919","DOIUrl":"https://doi.org/10.1109/TDEI.2026.3651919","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"33 1","pages":"C4-C4"},"PeriodicalIF":3.1,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11371486","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146102950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IEEE Dielectrics and Electrical Insulation Society Information","authors":"","doi":"10.1109/TDEI.2026.3651925","DOIUrl":"https://doi.org/10.1109/TDEI.2026.3651925","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"33 1","pages":"C3-C3"},"PeriodicalIF":3.1,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11371483","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146102972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"2025 Index IEEE Transactions on Dielectrics and Electrical Insulation","authors":"","doi":"10.1109/TDEI.2026.3651211","DOIUrl":"https://doi.org/10.1109/TDEI.2026.3651211","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 6","pages":"3780-3886"},"PeriodicalIF":3.1,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11333921","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IEEE Transactions on Dielectrics and Electrical Insulation Information for Authors","authors":"","doi":"10.1109/TDEI.2025.3634191","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3634191","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 6","pages":"C4-C4"},"PeriodicalIF":3.1,"publicationDate":"2025-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11315173","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145824288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Letter of Appreciation","authors":"Michael Wübbenhorst","doi":"10.1109/TDEI.2025.3640804","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3640804","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 6","pages":"3775-3779"},"PeriodicalIF":3.1,"publicationDate":"2025-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11315174","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145824304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IEEE Dielectrics and Electrical Insulation Society Information","authors":"","doi":"10.1109/TDEI.2025.3634189","DOIUrl":"https://doi.org/10.1109/TDEI.2025.3634189","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 6","pages":"C3-C3"},"PeriodicalIF":3.1,"publicationDate":"2025-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11315177","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145824297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}