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IF 3.8
IET Nanodielectrics Pub Date : 2025-08-06
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引用次数: 0
Molecular Dynamics Simulation of the Decomposition and Gas Generation Characteristics of Natural Ester Insulating Oils Under Overheated Conditions 过热条件下天然酯类绝缘油分解及产气特性的分子动力学模拟
IF 3.8
IET Nanodielectrics Pub Date : 2025-08-06 DOI: 10.1049/nde2.70016
Yiming Huang, Wu Lu, Weiwei Qi, Jun Zhang
{"title":"Molecular Dynamics Simulation of the Decomposition and Gas Generation Characteristics of Natural Ester Insulating Oils Under Overheated Conditions","authors":"Yiming Huang,&nbsp;Wu Lu,&nbsp;Weiwei Qi,&nbsp;Jun Zhang","doi":"10.1049/nde2.70016","DOIUrl":"10.1049/nde2.70016","url":null,"abstract":"<p>Natural ester insulating oils are increasingly replacing mineral oils as the insulating medium for oil-filled equipment due to their high ignition point, biodegradability, and other environmentally friendly properties. However, the reaction characteristics of natural ester insulating oils under different types of faults require further investigation. This paper presents the development of a molecular dynamics model employing the ReaxFF reactive force field to comprehensively simulate the decomposition of natural ester insulating oils over a temperature range of 2800–4000 K, elucidating the resulting product information. The gas production behaviour of natural ester insulating oils was examined under different overheating conditions and heating times. The simulation results indicate that the thermal decomposition products of natural ester insulating oil primarily consist of seven gases, including H<sub>2</sub>, CO, CO<sub>2</sub>, and others. Notably, the concentration of C<sub>2</sub>H<sub>4</sub> gas exhibits a significantly nonlinear negative correlation with overheating conditions. Because of variations in simulation temperatures, the characteristic gases generated during the thermal decomposition of natural ester insulating oil correspond to different fault types observed in real-world scenarios. Specifically, the gas production at a simulated temperature of 4000 K aligns with the gas production behaviour of insulating oil during discharge fault events in practice. The results of this study offer a theoretical basis for the application of insulation condition monitoring in oil-filled equipment through dissolved gas analysis (DGA).</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145128859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanical, Dielectric and Hydrophobic Properties of Phenyl Silicone Rubber and Methyl Vinyl Silicone Rubber Blend Composites 苯基硅橡胶和甲基乙烯基硅橡胶共混复合材料的力学、介电和疏水性
IF 3.8
IET Nanodielectrics Pub Date : 2025-07-18 DOI: 10.1049/nde2.70014
Xiaoli Liu, Hui Ao, Yankai Lin, Jian Wang, Shaojian He
{"title":"Mechanical, Dielectric and Hydrophobic Properties of Phenyl Silicone Rubber and Methyl Vinyl Silicone Rubber Blend Composites","authors":"Xiaoli Liu,&nbsp;Hui Ao,&nbsp;Yankai Lin,&nbsp;Jian Wang,&nbsp;Shaojian He","doi":"10.1049/nde2.70014","DOIUrl":"10.1049/nde2.70014","url":null,"abstract":"<p>Silicone rubber (SIR) composite insulators are widely employed in electrical applications due to their exceptional chemical stability, low surface energy and superior electrical insulation properties. To enhance the hydrophobicity and low-temperature resistance of SIR, blended composites with varying ratios of SIR and phenyl silicone rubber (PSIR) were fabricated. The study revealed that matrix-filler network interactions between PSIR and fillers were weaker compared to those in SIR-based systems. Increasing PSIR content led to reduced elongation at break in the composites, while tensile strength remained largely unchanged. Concurrently, the breakdown strength is inferior to that of pure PSIR composites. Notably, the blend of SIR and PSIR enhances both hydrophobicity and resistance to hydrophobicity migration. This work provides a strategic approach for enhancing the performance of SIR composites suitable for applications in regions with high humidity and significant rainfall.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144657603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IF 3.8
IET Nanodielectrics Pub Date : 2025-07-18
{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148083019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IF 3.8
IET Nanodielectrics Pub Date : 2025-07-15
{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148080345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Temperature Dependence of the Polarisation Characteristics of Epoxy Resin for Electrical Insulation 电绝缘用环氧树脂极化特性的温度依赖性
IF 3.8
IET Nanodielectrics Pub Date : 2025-07-15 DOI: 10.1049/nde2.70013
Qian Wang, Ting Lei, Jingyu Deng, Xidong Liang, Chao Wu
{"title":"Temperature Dependence of the Polarisation Characteristics of Epoxy Resin for Electrical Insulation","authors":"Qian Wang,&nbsp;Ting Lei,&nbsp;Jingyu Deng,&nbsp;Xidong Liang,&nbsp;Chao Wu","doi":"10.1049/nde2.70013","DOIUrl":"10.1049/nde2.70013","url":null,"abstract":"<p>Epoxy resin-based dielectric materials are widely used for electrical insulation. However, due to the application of electrical equipment in complex and diverse climatic environments, the characteristic variation of the material must be paid attention to. Besides, decoupling of the overall performance is necessary to trace the source of property variation. Thus, in this research, the polarisation characteristics over broad ranges of temperature and frequency of typical epoxy resin used for electrical insulation are investigated. Moreover, the Dissado–Hill model is adopted to quantitatively decouple the individual contribution of each microprocess. It indicates that the magnitudes of the polarisation processes below the glass transition temperature (<i>T</i><sub>g</sub>) are small, the influence of which on the overall polarisation characteristics is marginal. In comparison, the influence of <i>α</i> relaxation initiating above <i>T</i><sub>g</sub> on the magnitude of permittivity and the dielectric loss is prominent, which must be fully taken into consideration during insulation design. In addition, due to the long structure of repeating units in the backbone of epoxy, another polarisation process would appear at higher temperatures stemming from the internal relaxation of repeating units. Furthermore, the amplitude of conductance increases exponentially as temperature rises and would become the major component of loss at elevated temperatures. This research provides insights into the rational design of insulation structures and the development of novel epoxy materials.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surface Flashover Phenomena and Contributory Parameters in Oil-Pressboard Composite Insulation System Under DC Voltage 直流电压下油压板复合绝缘系统的表面闪络现象及影响因素
IF 3.8
IET Nanodielectrics Pub Date : 2025-06-12 DOI: 10.1049/nde2.70011
Kai Zhou, Bo Jiang, Zilu Wang, Li Chen, Yu Shen, Zihan Teng, Lei Jin, Meng Huang
{"title":"Surface Flashover Phenomena and Contributory Parameters in Oil-Pressboard Composite Insulation System Under DC Voltage","authors":"Kai Zhou,&nbsp;Bo Jiang,&nbsp;Zilu Wang,&nbsp;Li Chen,&nbsp;Yu Shen,&nbsp;Zihan Teng,&nbsp;Lei Jin,&nbsp;Meng Huang","doi":"10.1049/nde2.70011","DOIUrl":"10.1049/nde2.70011","url":null,"abstract":"<p>During the operation of HVDC transmission systems, the oil-pressboard insulation of converter transformers is constantly subjected to combined AC and DC voltages. The DC voltage component can easily lead to charge accumulation and induce surface flashover. To investigate the development process of surface flashover in oil–pressboard insulation under DC voltage and its influencing factors, this paper establishes a two-dimensional simulation model using finite element simulation software to study the electric field and charge distribution characteristics of oil–pressboard composite insulation systems. Using the established model, the paper analyses the influence of voltage, gap distance and electron mobility on the surface flashover development process.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IF 3.8
IET Nanodielectrics Pub Date : 2025-06-12
{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148075243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IF 3.8
IET Nanodielectrics Pub Date : 2025-06-11
{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148072168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of Oxygen on the Insulation Characteristics of Eco-Friendly Insulating Gas HFO-1336mzz(E)/CO2 氧对环保绝缘气体HFO-1336mzz(E)/CO2绝缘特性的影响
IF 3.8
IET Nanodielectrics Pub Date : 2025-06-11 DOI: 10.1049/nde2.70010
Song Xiao, Mingjun Tang, Chengying Wu, Hongsong Lian, Fei Wang, Haoran Xia, Ju Tang, Yi Li
{"title":"Effects of Oxygen on the Insulation Characteristics of Eco-Friendly Insulating Gas HFO-1336mzz(E)/CO2","authors":"Song Xiao,&nbsp;Mingjun Tang,&nbsp;Chengying Wu,&nbsp;Hongsong Lian,&nbsp;Fei Wang,&nbsp;Haoran Xia,&nbsp;Ju Tang,&nbsp;Yi Li","doi":"10.1049/nde2.70010","DOIUrl":"10.1049/nde2.70010","url":null,"abstract":"<p>HFO-1336mzz(E)/CO<sub>2</sub>, an eco-friendly insulating gas, garnered considerable interest recently as a potential substitute for SF<sub>6</sub> in gas-insulated equipment. To reduce the precipitation of fluorocarbon gases and solids during the decomposition process of HFO-1336mzz(E)/CO<sub>2</sub> gas mixture, O<sub>2</sub> is normally introduced as an additive. Herein, we investigated the influence of oxygen on the insulation performance of HFO-1336mzz(E)/CO<sub>2</sub> under different electric field non-uniformities by evaluating the breakdown voltage, PDIV, PDEV and decomposition characteristics. The findings indicate that in a quasi-uniform electric field, the breakdown voltage of the gas mixture progressively increases with the oxygen volume fraction. Under the extremely non-uniform electric field, both the breakdown voltage and PDIV initially rise and subsequently decline with the increase of oxygen volume fraction, reaching a peak at 6%. The PD decomposition analysis reveals that the addition of 4% oxygen can reduce the decomposition of HFO-1336mzz(E), which is most beneficial to improve the comprehensive insulation performance of the gas mixture.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144256359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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