Pub Date : 2024-07-29DOI: 10.1109/TDEI.2024.3434780
Cong Wang;Guangkai Cui;Xuke Gao;Geng Chen;Youping Tu;Zhong Zheng;Hua Jin;Yuan Yang
The correlation between the decomposition products and discharge faults in the electrical equipment with the environmentally friendly insulating gas mixture C4F7N/CO2/O2 remains inadequately revealed and the corresponding characterization methods also need to be determined. In this article, a feature fusion algorithm based on the stacking-attention mechanism is proposed. The ratios of decomposition products from C4F7N/CO2/O2 mixtures in various proportions under different discharge conditions are utilized as the dataset. Multiple feature extraction algorithms are employed as base learners to derive feature subsets from diverse dimensions. Subsequently, these feature subsets are fused using the attention mechanism as the meta-learner, and the contribution of each feature value is determined, thereby identifying the optimal feature subset. Experimental results demonstrate that the optimal feature values extracted by this method, when applied to classification algorithms such as support vector machine (SVM) and artificial neural network (ANN), effectively distinguish between defects including corona discharge, spark discharge, and suspended discharge in environmentally friendly gas-insulated equipment. Based on the decomposition characteristics, the ratios of CO/(C3F6+CF4) and CF4/C3F8 are proposed as diagnostic indicators for identifying discharge faults in engineering applications of C4F7N/CO2/O2 gas-insulated equipment. The research results of this article provide both theoretical and technical support for the operation and maintenance of gas-insulated electrical equipment.
{"title":"Method Based on Stacking-Attention to Find Decomposition Indicators of Discharge Mechanism in C4F7N-CO2-O2 Gas","authors":"Cong Wang;Guangkai Cui;Xuke Gao;Geng Chen;Youping Tu;Zhong Zheng;Hua Jin;Yuan Yang","doi":"10.1109/TDEI.2024.3434780","DOIUrl":"10.1109/TDEI.2024.3434780","url":null,"abstract":"The correlation between the decomposition products and discharge faults in the electrical equipment with the environmentally friendly insulating gas mixture C4F7N/CO2/O2 remains inadequately revealed and the corresponding characterization methods also need to be determined. In this article, a feature fusion algorithm based on the stacking-attention mechanism is proposed. The ratios of decomposition products from C4F7N/CO2/O2 mixtures in various proportions under different discharge conditions are utilized as the dataset. Multiple feature extraction algorithms are employed as base learners to derive feature subsets from diverse dimensions. Subsequently, these feature subsets are fused using the attention mechanism as the meta-learner, and the contribution of each feature value is determined, thereby identifying the optimal feature subset. Experimental results demonstrate that the optimal feature values extracted by this method, when applied to classification algorithms such as support vector machine (SVM) and artificial neural network (ANN), effectively distinguish between defects including corona discharge, spark discharge, and suspended discharge in environmentally friendly gas-insulated equipment. Based on the decomposition characteristics, the ratios of CO/(C3F6+CF4) and CF4/C3F8 are proposed as diagnostic indicators for identifying discharge faults in engineering applications of C4F7N/CO2/O2 gas-insulated equipment. The research results of this article provide both theoretical and technical support for the operation and maintenance of gas-insulated electrical equipment.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"31 6","pages":"3110-3119"},"PeriodicalIF":2.9,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141868864","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 : 2024-07-24DOI: 10.1109/tdei.2024.3433323
Xinglei Cui, Runhua Li, Chengshuo Huang, Xi Zhu, Zhi Fang
{"title":"Enhancing Surface Insulation Performance of Ceramic for Spark Plug by APPJ Treatment","authors":"Xinglei Cui, Runhua Li, Chengshuo Huang, Xi Zhu, Zhi Fang","doi":"10.1109/tdei.2024.3433323","DOIUrl":"https://doi.org/10.1109/tdei.2024.3433323","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"191 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141769475","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 : 2024-07-24DOI: 10.1109/TDEI.2024.3432489
Yuxin He;Lijun Yang;Xiong Liu;Li Cheng;Meicun Kang;Yong Li
Moisture content significantly impacts the electrical strength of oil-paper insulation. Acquiring moisture content accurately and promptly at different points in oil-paper insulation is crucial to assess the risks associated with oil-filled equipment. Moisture primarily resides in the insulating paper within oil-paper insulation, and the change in moisture content in pressboard is a dynamic process, especially after localized dampening. Besides the exchanges between oil and paper, the predominant movement of moisture occurs within different regions of the insulating paper. Previous studies have primarily focused on moisture exchange at the interface between insulating paper and insulating oil. Due to the lack of nondestructive testing methods, exploration of the migration and diffusion of moisture within the internal structure of insulating pressboard is limited. This aspect is pivotal for accurately assessing moisture distribution within the insulation, thereby directly influencing the evaluation of insulation risks. In this study, the rapid and nondestructive sensing capabilities of terahertz (THz) spectroscopy are used to quantify moisture content in solid insulation. The integral value of the absorption coefficient spectrum within the frequency range of 0.3–1 THz serves as a characteristic parameter for quantifying moisture content in insulating paper. A 2-D moisture-diffusion model for localized dampening in pressboard is established based on the Fick model. Using this approach, the diffusion behavior of localized dampening in new and aged oil-impregnated pressboard is demonstrated, and the diffusion coefficient within the pressboard is calculated. A relationship between this coefficient and moisture concentration is determined. Finally, the obtained diffusion coefficient is used to numerically deduce 3-D localized moisture-diffusion behavior within the pressboard.
{"title":"Moisture-Diffusion Behavior in Oil–Paper Insulation Based on Terahertz Time–Frequency Technology","authors":"Yuxin He;Lijun Yang;Xiong Liu;Li Cheng;Meicun Kang;Yong Li","doi":"10.1109/TDEI.2024.3432489","DOIUrl":"10.1109/TDEI.2024.3432489","url":null,"abstract":"Moisture content significantly impacts the electrical strength of oil-paper insulation. Acquiring moisture content accurately and promptly at different points in oil-paper insulation is crucial to assess the risks associated with oil-filled equipment. Moisture primarily resides in the insulating paper within oil-paper insulation, and the change in moisture content in pressboard is a dynamic process, especially after localized dampening. Besides the exchanges between oil and paper, the predominant movement of moisture occurs within different regions of the insulating paper. Previous studies have primarily focused on moisture exchange at the interface between insulating paper and insulating oil. Due to the lack of nondestructive testing methods, exploration of the migration and diffusion of moisture within the internal structure of insulating pressboard is limited. This aspect is pivotal for accurately assessing moisture distribution within the insulation, thereby directly influencing the evaluation of insulation risks. In this study, the rapid and nondestructive sensing capabilities of terahertz (THz) spectroscopy are used to quantify moisture content in solid insulation. The integral value of the absorption coefficient spectrum within the frequency range of 0.3–1 THz serves as a characteristic parameter for quantifying moisture content in insulating paper. A 2-D moisture-diffusion model for localized dampening in pressboard is established based on the Fick model. Using this approach, the diffusion behavior of localized dampening in new and aged oil-impregnated pressboard is demonstrated, and the diffusion coefficient within the pressboard is calculated. A relationship between this coefficient and moisture concentration is determined. Finally, the obtained diffusion coefficient is used to numerically deduce 3-D localized moisture-diffusion behavior within the pressboard.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"31 5","pages":"2621-2631"},"PeriodicalIF":2.9,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141769477","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 : 2024-07-24DOI: 10.1109/TDEI.2024.3433321
Xiujun Huang;Shengchang Ji;Mingyang Xu;Fan Zhang
The oil-paper insulation’s aging can deteriorate the mechanical and electrical performance of the electrical power device; thus, it is necessary to evaluate the aging state of oil-paper insulation. Based on the electro-mechanical impedance technology, a novel aging state evaluation method of oil-paper insulation is proposed in this letter, which utilizes the piezoelectricity caused by the insulating paper attached to the piezoelectric material (PZT). The electro-mechanical model of the paper-PZT system is established considering the electric-vibration coupling effect and its characteristics are analyzed using the principle of stationary action. The insulating paper with different aging states, indicated by the degree of polymerization (DP), is selected to obtain the impedance characteristics of the paper-PZT system. The experimental results show the impedance amplitudes of the paper-PZT system increase with the aging degree, which can help in the nondestructive aging evaluation of the oil-paper insulation.
{"title":"Aging State Evaluation of Oil-Paper Insulation Based on Electro-Mechanical Impedance Technology","authors":"Xiujun Huang;Shengchang Ji;Mingyang Xu;Fan Zhang","doi":"10.1109/TDEI.2024.3433321","DOIUrl":"10.1109/TDEI.2024.3433321","url":null,"abstract":"The oil-paper insulation’s aging can deteriorate the mechanical and electrical performance of the electrical power device; thus, it is necessary to evaluate the aging state of oil-paper insulation. Based on the electro-mechanical impedance technology, a novel aging state evaluation method of oil-paper insulation is proposed in this letter, which utilizes the piezoelectricity caused by the insulating paper attached to the piezoelectric material (PZT). The electro-mechanical model of the paper-PZT system is established considering the electric-vibration coupling effect and its characteristics are analyzed using the principle of stationary action. The insulating paper with different aging states, indicated by the degree of polymerization (DP), is selected to obtain the impedance characteristics of the paper-PZT system. The experimental results show the impedance amplitudes of the paper-PZT system increase with the aging degree, which can help in the nondestructive aging evaluation of the oil-paper insulation.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"31 5","pages":"2853-2856"},"PeriodicalIF":2.9,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141769476","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 : 2024-07-22DOI: 10.1109/tdei.2024.3432092
Boxue Du, Guoning Sun, Heyu Wang, Zhonglei Li
{"title":"Effect of Bending Deformation on Electrical Tree Properties of Polypropylene Copolymer and Blend Insulation for HVDC Cables","authors":"Boxue Du, Guoning Sun, Heyu Wang, Zhonglei Li","doi":"10.1109/tdei.2024.3432092","DOIUrl":"https://doi.org/10.1109/tdei.2024.3432092","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"48 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141769328","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":"Design Space Optimization for Eradication of NDR Effect in Dielectric/Ferroelectric Stacked Negative Capacitance Multi-Gate FETs at Sub-3nm Technology for Digital/Analog/RF Applications","authors":"Sresta Valasa, Venkata Ramakrishna Kotha, Shubham Tayal, Narendar Vadthiya","doi":"10.1109/tdei.2024.3432088","DOIUrl":"https://doi.org/10.1109/tdei.2024.3432088","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"15 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141769480","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 : 2024-07-22DOI: 10.1109/tdei.2024.3432100
H. Yao, B. X. Du, H. C. Liang, L. C. Hao, Y. X. Wang
{"title":"Electric Field Regulation of DC-GIS Spacer by Surface Conductivity Gradient Coatings under Variable Temperature Gradients","authors":"H. Yao, B. X. Du, H. C. Liang, L. C. Hao, Y. X. Wang","doi":"10.1109/tdei.2024.3432100","DOIUrl":"https://doi.org/10.1109/tdei.2024.3432100","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"34 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141769479","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 : 2024-07-22DOI: 10.1109/TDEI.2024.3432097
Jiachen Li;Feihu Zheng;Shijie Chen
Micrometer-thin polymer films often endure harsh operating environments such as high electric fields and high temperatures, when utilized as insulating or capacitive media. These conditions may cause significant space charge accumulation, potentially leading to premature breakdown of the film. However, due to the limitations in space charge measurement techniques, there are few reports on the relationship between space charge accumulation and prestress breakdown in micrometer thin films. In this work, the relationship between the space charge and the prestress failure in double-sided metalized biaxially oriented polypropylene (BOPP) film with a thickness of $3.8~mu $ m is investigated. Both dc prestress treatment and breakdown testing of the thin films are conducted using a ball plate electrode. The Weibull breakdown distribution illustrates the impact of prestress voltage and duration on the breakdown strength of the thin films. The residual electric field of the films, induced by space charge accumulation during prestress treatment, is measured using the thermal pulse method (TPM). The data indicate that the breakdown strength of the samples subjected to prestress treatment decreases, with the degree of decrease in breakdown strength basically consistent with the highest residual electric field of prestress treatment in numerical values. This experimentally demonstrates that the accumulation of space charges is the direct cause of the decrease in breakdown field strength in micrometer-thin films.
微米级薄聚合物薄膜在用作绝缘或电容介质时，通常要承受高电场和高温等恶劣的工作环境。这些条件可能会导致大量空间电荷积累，从而可能导致薄膜过早破裂。然而，由于空间电荷测量技术的限制，有关微米薄膜中空间电荷积累与预应力击穿之间关系的报道很少。在这项工作中，研究了厚度为 3.8~mu $ m 的双面金属化双向拉伸聚丙烯（BOPP）薄膜中空间电荷与预应力破坏之间的关系。薄膜的直流预应力处理和击穿测试均使用球板电极进行。Weibull 击穿分布说明了预应力电压和持续时间对薄膜击穿强度的影响。使用热脉冲法（TPM）测量了预应力处理过程中空间电荷积累引起的薄膜残余电场。数据表明，经过预应力处理的样品击穿强度会降低，击穿强度的降低程度与预应力处理的最高残余电场数值基本一致。这从实验上证明了空间电荷的积累是微米级薄膜击穿场强降低的直接原因。
{"title":"Relationship Between Prestress Breakdown and Space Charge in Micrometer-Thin Metalized Polymer Films","authors":"Jiachen Li;Feihu Zheng;Shijie Chen","doi":"10.1109/TDEI.2024.3432097","DOIUrl":"10.1109/TDEI.2024.3432097","url":null,"abstract":"Micrometer-thin polymer films often endure harsh operating environments such as high electric fields and high temperatures, when utilized as insulating or capacitive media. These conditions may cause significant space charge accumulation, potentially leading to premature breakdown of the film. However, due to the limitations in space charge measurement techniques, there are few reports on the relationship between space charge accumulation and prestress breakdown in micrometer thin films. In this work, the relationship between the space charge and the prestress failure in double-sided metalized biaxially oriented polypropylene (BOPP) film with a thickness of \u0000<inline-formula> <tex-math>$3.8~mu $ </tex-math></inline-formula>\u0000m is investigated. Both dc prestress treatment and breakdown testing of the thin films are conducted using a ball plate electrode. The Weibull breakdown distribution illustrates the impact of prestress voltage and duration on the breakdown strength of the thin films. The residual electric field of the films, induced by space charge accumulation during prestress treatment, is measured using the thermal pulse method (TPM). The data indicate that the breakdown strength of the samples subjected to prestress treatment decreases, with the degree of decrease in breakdown strength basically consistent with the highest residual electric field of prestress treatment in numerical values. This experimentally demonstrates that the accumulation of space charges is the direct cause of the decrease in breakdown field strength in micrometer-thin films.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"31 5","pages":"2389-2397"},"PeriodicalIF":2.9,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141769478","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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