This study predicts the failure of energized silicone rubber exposed to corrosive fog environments by analyzing leakage current characteristics and the hydrophobicity loss ratio, which serve as indicators of insulation degradation and operational reliability.
{"title":"Failure Mechanisms and Characterization of High-Temperature-Vulcanized Silicone Rubber Under AC Electric Fields Subject to Corrosive Environments","authors":"Guohui Pang;Zhijin Zhang;Steven Qi Li;Jiayu Li;Simon M. Rowland;Song Yue;Konstantinos Kopsidas;Xingliang Jiang","doi":"10.1109/MEI.2026.11306299","DOIUrl":"https://doi.org/10.1109/MEI.2026.11306299","url":null,"abstract":"This study predicts the failure of energized silicone rubber exposed to corrosive fog environments by analyzing leakage current characteristics and the hydrophobicity loss ratio, which serve as indicators of insulation degradation and operational reliability.","PeriodicalId":444,"journal":{"name":"IEEE Electrical Insulation Magazine","volume":"42 1","pages":"16-29"},"PeriodicalIF":1.3,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145778261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1109/MEI.2026.11306325
Alfredo Contin;Andrea Piccolo;Andrea Cavallini
New categories of partial discharge activity are proposed to enable source identification consistent with the intrinsic nature of partial discharges.
提出了部分放电活动的新类别，以便能够与部分放电的内在性质相一致地识别源。
{"title":"New Categories for Phase-Resolved Partial Discharge Pattern Classification","authors":"Alfredo Contin;Andrea Piccolo;Andrea Cavallini","doi":"10.1109/MEI.2026.11306325","DOIUrl":"https://doi.org/10.1109/MEI.2026.11306325","url":null,"abstract":"New categories of partial discharge activity are proposed to enable source identification consistent with the intrinsic nature of partial discharges.","PeriodicalId":444,"journal":{"name":"IEEE Electrical Insulation Magazine","volume":"42 1","pages":"6-15"},"PeriodicalIF":1.3,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145778311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1109/MEI.2026.11306327
Yoshimichi Ohki
In recent years, the development of CO2-free power generation has been progressing around the world to reach the goal of realizing a sustainable society. As an island nation surrounded by oceans, Japan has begun to promote the introduction of off-shore wind power generation. However, in many projects being planned, it is envisaged that large-scale offshore wind farms may be in areas away from major electricity consumption areas because of the restrictions of favorable wind and other conditions. To expand offshore wind power generation, we need to introduce a DC power transmission system with an excellent long-distance power transmission efficiency. Specifically, to increase the capacity of highly stable and efficient power transmission, it is desirable to introduce a DC power transmission system that connects via multiple terminals many offshore wind farms and power grids, transmitting power to demanding areas.
{"title":"News from Japan","authors":"Yoshimichi Ohki","doi":"10.1109/MEI.2026.11306327","DOIUrl":"https://doi.org/10.1109/MEI.2026.11306327","url":null,"abstract":"In recent years, the development of CO2-free power generation has been progressing around the world to reach the goal of realizing a sustainable society. As an island nation surrounded by oceans, Japan has begun to promote the introduction of off-shore wind power generation. However, in many projects being planned, it is envisaged that large-scale offshore wind farms may be in areas away from major electricity consumption areas because of the restrictions of favorable wind and other conditions. To expand offshore wind power generation, we need to introduce a DC power transmission system with an excellent long-distance power transmission efficiency. Specifically, to increase the capacity of highly stable and efficient power transmission, it is desirable to introduce a DC power transmission system that connects via multiple terminals many offshore wind farms and power grids, transmitting power to demanding areas.","PeriodicalId":444,"journal":{"name":"IEEE Electrical Insulation Magazine","volume":"42 1","pages":"37-41"},"PeriodicalIF":1.3,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11306327","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145778316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1109/MEI.2026.11306296
Zepeng Lv
Metal oxide varistors (MOV) with excellent nonlinear current density-electric field $(J-E)$ characteristics are the key components of arresters, which are critical for protecting power systems against overvoltage. Metal oxide varistors inevitably undergo aging during their long-term service under continuous electrical stress, typically manifesting as degraded electrical performance such as declined nonlinear coefficient, decreased breakdown voltage, and increased leakage current. As shown in Figure 1, aging of conventional MOV leads to a monotonic increase in power loss, which finally triggers thermal runaway and serious failure. This classical aging behavior has been well described by the ion migration model proposed by Gupta and Carlson in 1985 [1], wherein mobile ions (e.g., zinc interstitials) migrate toward grain boundaries (GB) under an applied electric field, neutralizing negatively charged interface states. The double Schottky barrier (DSB) is thus reduces, resulting in increased power loss. It has been the theoretical foundation for reliability optimization and condition assessment of MOV over the past 40 years.
{"title":"Stories from China","authors":"Zepeng Lv","doi":"10.1109/MEI.2026.11306296","DOIUrl":"https://doi.org/10.1109/MEI.2026.11306296","url":null,"abstract":"Metal oxide varistors (MOV) with excellent nonlinear current density-electric field <tex>$(J-E)$</tex> characteristics are the key components of arresters, which are critical for protecting power systems against overvoltage. Metal oxide varistors inevitably undergo aging during their long-term service under continuous electrical stress, typically manifesting as degraded electrical performance such as declined nonlinear coefficient, decreased breakdown voltage, and increased leakage current. As shown in Figure 1, aging of conventional MOV leads to a monotonic increase in power loss, which finally triggers thermal runaway and serious failure. This classical aging behavior has been well described by the ion migration model proposed by Gupta and Carlson in 1985 [1], wherein mobile ions (e.g., zinc interstitials) migrate toward grain boundaries (GB) under an applied electric field, neutralizing negatively charged interface states. The double Schottky barrier (DSB) is thus reduces, resulting in increased power loss. It has been the theoretical foundation for reliability optimization and condition assessment of MOV over the past 40 years.","PeriodicalId":444,"journal":{"name":"IEEE Electrical Insulation Magazine","volume":"42 1","pages":"42-44"},"PeriodicalIF":1.3,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11306296","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145778117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1109/MEI.2026.11306326
Xinyue Zhang
Harbin, China, August 7–10, 2025—The inaugural Asian Summer School on Dielectric Insulation (ASSDI 2025) was successfully held at the Ice Island Hotel on Sun Island, Harbin (Figure 1). The event was organized by Xi'an Jiaotong University, sponsored by the IEEE Dielectrics and Electrical Insulation Society (IEEE DEIS), and co-organized by Harbin University of Science and Technology.
{"title":"Bulletin Board: First Asian Summer School on Dielectric Insulation (ASSDI 2025) Successfully Held in Harbin, China","authors":"Xinyue Zhang","doi":"10.1109/MEI.2026.11306326","DOIUrl":"https://doi.org/10.1109/MEI.2026.11306326","url":null,"abstract":"Harbin, China, August 7–10, 2025—The inaugural Asian Summer School on Dielectric Insulation (ASSDI 2025) was successfully held at the Ice Island Hotel on Sun Island, Harbin (Figure 1). The event was organized by Xi'an Jiaotong University, sponsored by the IEEE Dielectrics and Electrical Insulation Society (IEEE DEIS), and co-organized by Harbin University of Science and Technology.","PeriodicalId":444,"journal":{"name":"IEEE Electrical Insulation Magazine","volume":"42 1","pages":"58-61"},"PeriodicalIF":1.3,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11306326","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145778270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1109/MEI.2026.11306288
Tony Lujia Chen
This issue includes three articles, the first titled “New Categories for Phase-Resolved Partial Discharge Pattern Classification,” by Contin, Piccolo, and Cavallini. It presents a refined framework for analyzing phase-resolved partial discharge (PRPD) patterns in insulation diagnostics. The study questions the traditional one-to-one link between PRPD shapes and defect types, proposing three new categories: voltage-dependent, multiple, and ambiguous patterns. This is to better represent the changing nature of discharge phenomena. By testing insulation systems rated between 4 and 18 kV, including porous tape insulation and four-layer mica tapes, the authors show how PRPD patterns develop under different voltage levels, aging conditions, and stress factors. Examples include distributed micro-void discharges that change from “rabbit-ear” to rounded shapes, symmetric in polarity and phase. The article emphasizes the limitations of relying only on pattern shape for diagnosis and recommends additional localization techniques such as antenna probes and ultrasound detectors. This work is especially valuable for those seeking to improve the reliability of insulation evaluation and develop more advanced pattern-recognition systems for rotating electrical machines.
{"title":"From the Editor","authors":"Tony Lujia Chen","doi":"10.1109/MEI.2026.11306288","DOIUrl":"https://doi.org/10.1109/MEI.2026.11306288","url":null,"abstract":"This issue includes three articles, the first titled “New Categories for Phase-Resolved Partial Discharge Pattern Classification,” by Contin, Piccolo, and Cavallini. It presents a refined framework for analyzing phase-resolved partial discharge (PRPD) patterns in insulation diagnostics. The study questions the traditional one-to-one link between PRPD shapes and defect types, proposing three new categories: voltage-dependent, multiple, and ambiguous patterns. This is to better represent the changing nature of discharge phenomena. By testing insulation systems rated between 4 and 18 kV, including porous tape insulation and four-layer mica tapes, the authors show how PRPD patterns develop under different voltage levels, aging conditions, and stress factors. Examples include distributed micro-void discharges that change from “rabbit-ear” to rounded shapes, symmetric in polarity and phase. The article emphasizes the limitations of relying only on pattern shape for diagnosis and recommends additional localization techniques such as antenna probes and ultrasound detectors. This work is especially valuable for those seeking to improve the reliability of insulation evaluation and develop more advanced pattern-recognition systems for rotating electrical machines.","PeriodicalId":444,"journal":{"name":"IEEE Electrical Insulation Magazine","volume":"42 1","pages":"4-5"},"PeriodicalIF":1.3,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11306288","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145778461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1109/MEI.2026.11306287
The Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) 2025, held from September 14 to 17 at the University of Manchester (UK), marked a landmark moment in its history. With 342 delegates from 33 countries, CEIDP 2025 marked its centennial edition by fostering technical excellence, shared expertise, and a strong sense of community.
{"title":"Bulletin Board: IEEE CEIDP 2025—A Celebration of Dielectric Science in Manchester","authors":"","doi":"10.1109/MEI.2026.11306287","DOIUrl":"https://doi.org/10.1109/MEI.2026.11306287","url":null,"abstract":"The Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) 2025, held from September 14 to 17 at the University of Manchester (UK), marked a landmark moment in its history. With 342 delegates from 33 countries, CEIDP 2025 marked its centennial edition by fostering technical excellence, shared expertise, and a strong sense of community.","PeriodicalId":444,"journal":{"name":"IEEE Electrical Insulation Magazine","volume":"42 1","pages":"55-57"},"PeriodicalIF":1.3,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11306287","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145778286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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