Pub Date : 2024-06-21DOI: 10.1109/tdei.2024.3417412
Qi Li, Boxue Du, WenBo Zhu, Xiaoxiao Kong
{"title":"Epoxy Bushing Breakdown Caused by Uneven Thermal Stress in Cable Termination under Extremely Cold Weather","authors":"Qi Li, Boxue Du, WenBo Zhu, Xiaoxiao Kong","doi":"10.1109/tdei.2024.3417412","DOIUrl":"https://doi.org/10.1109/tdei.2024.3417412","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141514659","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 Air Pressure on Laser-Induced Breakdown Spectroscopy of Silicon Rubber Insulators","authors":"Qi Wang, Yu Deng, Yongqi He, Xinzhe Yu, Zheyuan Liu, Xilin Wang","doi":"10.1109/tdei.2024.3416431","DOIUrl":"https://doi.org/10.1109/tdei.2024.3416431","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141969672","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}
Pub Date : 2024-06-19DOI: 10.1109/tdei.2024.3416936
Tianrui Qiu, Yadong Zhang, Gaofeng Yan, Quanyou Nie, Huilong Wan, Kaixiang Li
{"title":"Aging Characteristics and Lifespan Prediction of 3240 Fiberglass Epoxy Material under Pulse Electrical Aging","authors":"Tianrui Qiu, Yadong Zhang, Gaofeng Yan, Quanyou Nie, Huilong Wan, Kaixiang Li","doi":"10.1109/tdei.2024.3416936","DOIUrl":"https://doi.org/10.1109/tdei.2024.3416936","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947097","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}
Pub Date : 2024-06-19DOI: 10.1109/TDEI.2024.3416933
Marcus V.S. da Silva;Olga M. O. de Araújo;Davi F. de Oliveira;Ricardo T. Lopes
Air voids within cables insulated with cross-linked polyethylene (EPR) are identified as vulnerabilities due to their association with operational charges resulting from partial discharges. These voids generate intense and nonuniform electric fields, leading to an increase in dissipated power. Therefore, this work investigates the impact of voids in the conductor and insulating layers of three-phase cables. Simulations are carried out using COMSOL Multiphysics software based on the Finite Element Method (FEM). The research focuses on evaluating the behavior of electrical cables with copper and aluminum cores with inserted air voids. A voltage of 1 kV, frequency of 60 Hz with alternating current (ac), and a 120° phase shift are applied. In addition, an analytical solution based on Maxwell’s equations and Ampere’s law is developed for two cables of identical cylindrical geometry and a length of L =15 m for copper and aluminum cores. It was found that power cables with copper cores exhibit better conduction of volumetric power density, resulting in superior efficiency in the transmission of electrical energy in three-phase systems compared to aluminum power cables. However, under the effect of electric field accumulation, the present voids may rupture, triggering a series of detrimental phenomena to the functioning of the electrical system. Partial discharge activity is influenced by various factors, including applied voltage, shape, size, and location of voids, as well as the presence of small protrusions on the conductor surface. The results reveal an increase in volumetric power densities attributed to the presence of air voids, highlighting the significant influence of the voids’ location on the behavior and functionality of the electrical system during operation.
{"title":"Volumetric Power Density Distribution in Low Voltage Cables With Maxwell Equations and FEM Simulations","authors":"Marcus V.S. da Silva;Olga M. O. de Araújo;Davi F. de Oliveira;Ricardo T. Lopes","doi":"10.1109/TDEI.2024.3416933","DOIUrl":"10.1109/TDEI.2024.3416933","url":null,"abstract":"Air voids within cables insulated with cross-linked polyethylene (EPR) are identified as vulnerabilities due to their association with operational charges resulting from partial discharges. These voids generate intense and nonuniform electric fields, leading to an increase in dissipated power. Therefore, this work investigates the impact of voids in the conductor and insulating layers of three-phase cables. Simulations are carried out using COMSOL Multiphysics software based on the Finite Element Method (FEM). The research focuses on evaluating the behavior of electrical cables with copper and aluminum cores with inserted air voids. A voltage of 1 kV, frequency of 60 Hz with alternating current (ac), and a 120° phase shift are applied. In addition, an analytical solution based on Maxwell’s equations and Ampere’s law is developed for two cables of identical cylindrical geometry and a length of L =15 m for copper and aluminum cores. It was found that power cables with copper cores exhibit better conduction of volumetric power density, resulting in superior efficiency in the transmission of electrical energy in three-phase systems compared to aluminum power cables. However, under the effect of electric field accumulation, the present voids may rupture, triggering a series of detrimental phenomena to the functioning of the electrical system. Partial discharge activity is influenced by various factors, including applied voltage, shape, size, and location of voids, as well as the presence of small protrusions on the conductor surface. The results reveal an increase in volumetric power densities attributed to the presence of air voids, highlighting the significant influence of the voids’ location on the behavior and functionality of the electrical system during operation.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947096","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 Thermal Ageing on DC Conductivity and Breakdown Strength of Natural Ester Oils for HVDC Applications","authors":"Deepak Kanumuri, Ambuj Kumar, Niharika Baruah, Sisir Kumar Nayak","doi":"10.1109/tdei.2024.3416929","DOIUrl":"https://doi.org/10.1109/tdei.2024.3416929","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947009","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":"Flashover Properties of PEEK-FSR Interface of Underwater HV Electrical Connector in Extremely Hot and Humid Environment","authors":"Xiaoang Li, Haihui Wang, Haitao Xu, Simiao Chen, Zhenpeng Zhang, Yanjie Le, Qiaogen Zhang","doi":"10.1109/tdei.2024.3416934","DOIUrl":"https://doi.org/10.1109/tdei.2024.3416934","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947098","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}
As the voltage level continues to rise, an imperative demand arises for novel insulating papers characterized by superior electrical insulation strength and heightened thermal stability, to align with the transformative advancements in high-voltage power transformers. Nevertheless, conventional approaches relying on “trial-and-error” approaches encounter significant challenges in expeditiously developing alternative materials. Therefore, the mechanical, thermal stability and dielectric attributes of polyimide (PI)/cellulose insulating paper have been predicted through molecular dynamics (MD) simulations. Subsequently, insulating papers of the composite variety, featuring varying PI fiber content, have been fabricated and subjected to comprehensive investigations of their thermal stability and electrical characteristics. In comparison to pure cellulose insulating paper, the 6% PI/cellulose composite proves (P6) to be the most representative, exhibiting a notable 26.24% increase in tensile strength, a rise in glass transition temperature from 113.4 to 124.7 K, a reduction in permittivity from 4.22 to 3.25, a substantial 58.33% decrease in dielectric loss, and a 30.35% enhancement in breakdown strength. This study unequivocally confirms the efficacy of MD simulations in expediting the development of insulating material and establishes PI/cellulose insulating paper as an avant-garde alternative for high-voltage transformers, ushering in a new era for insulation materials.
{"title":"Polyimide-Modified Cellulose Insulating Paper With Improved Thermal Stability and Insulation Properties","authors":"Wenchang Wei;Yiyi Zhang;Haiqiang Chen;Chuqi Xu;Shuangxi Nie;Junwei Zha","doi":"10.1109/TDEI.2024.3414376","DOIUrl":"https://doi.org/10.1109/TDEI.2024.3414376","url":null,"abstract":"As the voltage level continues to rise, an imperative demand arises for novel insulating papers characterized by superior electrical insulation strength and heightened thermal stability, to align with the transformative advancements in high-voltage power transformers. Nevertheless, conventional approaches relying on “trial-and-error” approaches encounter significant challenges in expeditiously developing alternative materials. Therefore, the mechanical, thermal stability and dielectric attributes of polyimide (PI)/cellulose insulating paper have been predicted through molecular dynamics (MD) simulations. Subsequently, insulating papers of the composite variety, featuring varying PI fiber content, have been fabricated and subjected to comprehensive investigations of their thermal stability and electrical characteristics. In comparison to pure cellulose insulating paper, the 6% PI/cellulose composite proves (P6) to be the most representative, exhibiting a notable 26.24% increase in tensile strength, a rise in glass transition temperature from 113.4 to 124.7 K, a reduction in permittivity from 4.22 to 3.25, a substantial 58.33% decrease in dielectric loss, and a 30.35% enhancement in breakdown strength. This study unequivocally confirms the efficacy of MD simulations in expediting the development of insulating material and establishes PI/cellulose insulating paper as an avant-garde alternative for high-voltage transformers, ushering in a new era for insulation materials.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141965101","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}
Pub Date : 2024-06-13DOI: 10.1109/TDEI.2024.3413725
Ivan Semenov;Torstein Grav Aakre;Ingrid Gunheim Folkestad;Ingrid Smisethjell;Kaveh Niayesh;Lars E. Lundgaard
This article summarizes experiments that were carried out on insulating ceramic substrates and a needle-plane arrangement with the purpose of characterizing the inception of partial discharges (PDs) in the insulation of high-voltage semiconductors. PD measurement results obtained on substrates are correlated with the high-field preinception currents measured in a needle-plane electrode arrangement in liquids and gel. The tested substrates were embedded in either silicone liquid, silicone gel, or mineral oil. The PD inception was measured at sinusoidal and switched voltage of different polarities and rise times. For all test objects, the PD inception voltage (PDIV) is significantly lower under switched voltage compared to the sinusoidal voltage. Silicone gel and silicone liquid as insulating media surrounding the substrate are similar in terms of the PDIV. The PDIV is lower for substrates placed in mineral oil, particularly under switched voltage. Silicone gel and liquid are characterized by very low preinception currents measured at a high electric field. In contrast, a higher preinception current is observed in mineral oil. These results are consistent with the hypothesis that the high predischarge current in the more conductive mineral oil leads to space charge build-up in the high-field region that, by deforming the electric field, affects the PD inception probability.
{"title":"Partial Discharge Inception in Ceramic Substrates Embedded in Silicone Liquid, Silicone Gel, and Mineral Oil at Fast Voltage Rise and Sinusoidal Voltage","authors":"Ivan Semenov;Torstein Grav Aakre;Ingrid Gunheim Folkestad;Ingrid Smisethjell;Kaveh Niayesh;Lars E. Lundgaard","doi":"10.1109/TDEI.2024.3413725","DOIUrl":"https://doi.org/10.1109/TDEI.2024.3413725","url":null,"abstract":"This article summarizes experiments that were carried out on insulating ceramic substrates and a needle-plane arrangement with the purpose of characterizing the inception of partial discharges (PDs) in the insulation of high-voltage semiconductors. PD measurement results obtained on substrates are correlated with the high-field preinception currents measured in a needle-plane electrode arrangement in liquids and gel. The tested substrates were embedded in either silicone liquid, silicone gel, or mineral oil. The PD inception was measured at sinusoidal and switched voltage of different polarities and rise times. For all test objects, the PD inception voltage (PDIV) is significantly lower under switched voltage compared to the sinusoidal voltage. Silicone gel and silicone liquid as insulating media surrounding the substrate are similar in terms of the PDIV. The PDIV is lower for substrates placed in mineral oil, particularly under switched voltage. Silicone gel and liquid are characterized by very low preinception currents measured at a high electric field. In contrast, a higher preinception current is observed in mineral oil. These results are consistent with the hypothesis that the high predischarge current in the more conductive mineral oil leads to space charge build-up in the high-field region that, by deforming the electric field, affects the PD inception probability.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141966163","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}
Pub Date : 2024-06-12DOI: 10.1109/TDEI.2024.3413046
Jiajian Yuan;Haiyan Chen;Hang Luo
Dielectric nanocomposites are considered to be the most promising energy storage material due to their fast charging and discharging capabilities and high-power density. Pre-breakdown degradation mechanisms for dielectric nanocomposites have become one of the current research hotspots to further improve the energy storage performance. Herein, the Weismann–Zeller (WZ) model is used to simulate the transmission path of the electric tree and the evolution of breakdown damage morphology for polyetherimide (PEI) polymers with the addition of 1-D Al2O3 platelets. Simultaneously, the distribution of electric displacement and electric potential is analyzed using COMSOL Multiphysics. From the simulation results, the electrical tree tends to be more bifurcated, the fractal dimension of the electric tree increases first and then decreases with the continuous addition of Al2O3 platelets. Appropriate quantities of Al2O3 platelets can effectively inhibit the progression of electric tree, delay the damage speed, and finally improve the breakdown strength of nanocomposites. An electric potential can be concentrated on the interface between platelets and polymer matrix due to their large permittivity difference. The above research can provide guidance for designing dielectric nanocomposites with high breakdown strength and high energy storage density in the application of power electronic devices.
{"title":"Influence of Al2O3 Contents on the Progression of Electrical Tree in Polyetherimide Films","authors":"Jiajian Yuan;Haiyan Chen;Hang Luo","doi":"10.1109/TDEI.2024.3413046","DOIUrl":"https://doi.org/10.1109/TDEI.2024.3413046","url":null,"abstract":"Dielectric nanocomposites are considered to be the most promising energy storage material due to their fast charging and discharging capabilities and high-power density. Pre-breakdown degradation mechanisms for dielectric nanocomposites have become one of the current research hotspots to further improve the energy storage performance. Herein, the Weismann–Zeller (WZ) model is used to simulate the transmission path of the electric tree and the evolution of breakdown damage morphology for polyetherimide (PEI) polymers with the addition of 1-D Al2O3 platelets. Simultaneously, the distribution of electric displacement and electric potential is analyzed using COMSOL Multiphysics. From the simulation results, the electrical tree tends to be more bifurcated, the fractal dimension of the electric tree increases first and then decreases with the continuous addition of Al2O3 platelets. Appropriate quantities of Al2O3 platelets can effectively inhibit the progression of electric tree, delay the damage speed, and finally improve the breakdown strength of nanocomposites. An electric potential can be concentrated on the interface between platelets and polymer matrix due to their large permittivity difference. The above research can provide guidance for designing dielectric nanocomposites with high breakdown strength and high energy storage density in the application of power electronic devices.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141965100","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}
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