IEEE Transactions on Dielectrics and Electrical Insulation最新文献_第8页

Partial Discharge and Degradation Characteristics of Cast Resin Transformers Due to Bipolar Impulse Application 双极脉冲作用下铸造树脂变压器的局部放电和退化特性

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-25 DOI: 10.1109/TDEI.2024.3468249

Yuanhang Yao;Mizuki Miyagawa;Masayuki Hikita;Masahiro Kozako;Yoshihiro Harada;Katsutoshi Takei;Masaru Ikeda;Kazunori Miyazaki;Kazuhiro Futakawa

{"title":"Partial Discharge and Degradation Characteristics of Cast Resin Transformers Due to Bipolar Impulse Application","authors":"Yuanhang Yao;Mizuki Miyagawa;Masayuki Hikita;Masahiro Kozako;Yoshihiro Harada;Katsutoshi Takei;Masaru Ikeda;Kazunori Miyazaki;Kazuhiro Futakawa","doi":"10.1109/TDEI.2024.3468249","DOIUrl":"https://doi.org/10.1109/TDEI.2024.3468249","url":null,"abstract":"The objective of our work is to investigate partial discharge (PD) behaviors and degradation characteristics in winding insulation of an actual 22 kV cast resin transformer (CRTr) when subjected to bipolar impulse voltages. A differential high-frequency current transformer (HFCT) was employed on the high-voltage coils to measure PD pulses induced by impulse voltages. Additionally, PD measurement at ac voltage was carried out to characterize the aging process resulting from the application of bipolar impulses. Experimental findings indicated that higher-level bipolar impulses could cause large-amplitude PDs in the windings, occurring at the peak value of the applied impulse voltages and increasing with the number of applied impulses. PD inception voltage (PDIV) at ac voltage decreased to the operating voltage, and the discharge amplitude and phasewidth in phase-resolved PD (PRPD) patterns increased due to impulse PD occurrences. Considering these results, it is evident that the bipolar lightning impulses could cause large-amplitude PDs, intensify impulse PD activity, and ultimately lead to dielectric breakdown in the CRTr windings. Space charge accumulation and residual charge deposition resulting from impulse PD play a significant role in the generation and the process of development for impulse PDs in the winding insulation, contributing to an acceleration effect in the degradation process and eventual insulation failure.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"31 6","pages":"3489-3496"},"PeriodicalIF":2.9,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859238","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}

引用次数: 0

Molecular Dynamics Study on the Enhancement of Electrothermal Stability of HTV SR by Different Functional Groups of POSS POSS不同官能团增强HTV SR电热稳定性的分子动力学研究

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-24 DOI: 10.1109/TDEI.2024.3463611

Lujia Wang;Yifan Chen;Mengdi Yang;Xiaohua Ma;Chenliang Ji;Jianwen Zhang;Haitao Yang

{"title":"Molecular Dynamics Study on the Enhancement of Electrothermal Stability of HTV SR by Different Functional Groups of POSS","authors":"Lujia Wang;Yifan Chen;Mengdi Yang;Xiaohua Ma;Chenliang Ji;Jianwen Zhang;Haitao Yang","doi":"10.1109/TDEI.2024.3463611","DOIUrl":"https://doi.org/10.1109/TDEI.2024.3463611","url":null,"abstract":"The occurrence of electrothermal decomposition in high-temperature vulcanized silicone rubber (HTV SR) significantly compromises the insulation performance of composite insulators. The effective modulation of its electrothermal stability is achieved by incorporating organic nanofillers into the HTV SR. Currently, introducing polyhedral oligomeric silsesquioxane (POSS) as a doping filler into HTV SR represents a key direction in the modification of organosilicon materials. However, traditional experimental methods have difficulty explaining the mechanism through the microscopic perspective, by which POSS enhances the electrothermal stability of HTV SR. Therefore, this article constructs three models: a pure HTV SR model and two composite models with octavinyl-POSS and octaphenyl-POSS dopants in HTV SR. First, based on molecular dynamics simulations, the enhanced key properties of different composite models are analyzed. Then, based on the reactive force field simulation, the micro-regulation role of POSS in enhancing the electrothermal stability of HTV SR was investigated. The results indicate that the introduction of POSS inhibits the breaking of chemical bonds in HTV SR molecules, reducing the formation of decomposition products such as CH4 and H2, with maximum decreases of 28.3% and 13.3%, respectively. Simultaneously, POSS also promotes crosslinking carbonization between the molecular chains of HTV SR, alleviating the damage caused by the decomposition of the material. Among them, octaphenyl-POSS has a better overall enhancement effect, and octavinyl-POSS has a better compatibility with the HTV SR system, which provides a reference basis for the selection of POSS dopant materials suitable for the modification of HTV SR.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"805-814"},"PeriodicalIF":2.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761448","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}

引用次数: 0

Features of Partial Discharges in Bubbles Irradiated With X-Rays x射线照射下气泡局部放电的特征

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-23 DOI: 10.1109/TDEI.2024.3466111

Sergey M. Korobeynikov;Alexander V. Ridel;Svetlana S. Bobrovskaya;Vladimir E. Shevchenko

引用次数: 0

Mechanism of Copper Sulfide Deposition on Oil-Paper Insulation Partial Discharge Under Extremely Uneven Electric Field 极不均匀电场条件下油纸绝缘局部放电中硫化铜沉积机理研究

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-23 DOI: 10.1109/TDEI.2024.3466113

Haoxi Cong;Wenjing Su;Yuxuan Wang;Lipan Qiao;Qingmin Li;Mingrong Xu

{"title":"Mechanism of Copper Sulfide Deposition on Oil-Paper Insulation Partial Discharge Under Extremely Uneven Electric Field","authors":"Haoxi Cong;Wenjing Su;Yuxuan Wang;Lipan Qiao;Qingmin Li;Mingrong Xu","doi":"10.1109/TDEI.2024.3466113","DOIUrl":"https://doi.org/10.1109/TDEI.2024.3466113","url":null,"abstract":"The corrosive sulfur in transformer oil reacts with the copper winding to form copper sulfide (Cu2S) deposits, which cause partial discharge (PD) and accelerate the degradation of the oil-paper insulation. Currently, the mechanism of the influence of Cu2S deposition on PD is not clear. This article presents a simulation model for oil-paper insulation PD with Cu2S depositions under point-plane electrodes and studies the PD process and the influence law on PD at different distributions of Cu2S deposits under extremely uneven electric fields. The findings indicate that the presence of Cu2S deposits enhances the intensity of the electric field within the oil gap, thereby expediting the progression rate of the streamer. Upon reaching the Cu2S surface, the streamer will cause severe surface discharge. Increasing the deposition width is beneficial for the diffusion of charge on its surface but not the accumulation of charge. The surface charge density of Cu2S deposition with a large width climbs more slowly, the smaller the peak, and the smaller the final density level maintained. Meanwhile, the increase in deposition thickness not only shortens the streamer’s diffusion distance and increases the electric field intensity within the oil gap, but also reduces the onset and development time of surface discharge. Within a certain distance range, Cu2S deposition generates more charge when discharged away from the surface of the needle tip. The studies of PD under the influence of Cu2S deposition partially reveal the physical process and influencing factors of Cu2S-induced PD. This information is instrumental in developing a more accurate deposition detection method and is conducive to the optimization of the insulating structure and the research on the technology of suppressing PD.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"1027-1035"},"PeriodicalIF":2.9,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761445","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}

引用次数: 0

Impact of Interphase Dielectric Property on Electric Field Distribution of Polymer Nanocomposites 相间介电性能对聚合物纳米复合材料电场分布的影响

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-23 DOI: 10.1109/TDEI.2024.3465449

Farhina Haque

{"title":"Impact of Interphase Dielectric Property on Electric Field Distribution of Polymer Nanocomposites","authors":"Farhina Haque","doi":"10.1109/TDEI.2024.3465449","DOIUrl":"https://doi.org/10.1109/TDEI.2024.3465449","url":null,"abstract":"The fast-switching frequency, high slew rate, and high voltage provided by the advanced power electronics inverters promote pa discharge (PD) in the turn-to-turn insulation in the inverter-fed motors. Polymer nanocomposites have been drawing the attention of researchers as PD-resistant insulating materials in inverter-fed motors. The high-volume fraction of interphase between the metal oxide nanoparticles and polymers improves the dielectric properties of the enameled wire. In this article, a numerical model of the electric field distribution of polymer nanocomposites is developed based on the dielectric properties of the interphase between the nanoparticles and metal oxides. The relative permittivity of the interphase region is first determined from the thickness and volume fraction of nanoparticles. A numerical model of polymer nanocomposites is developed in COMSOL Multiphysics to determine the electric field distribution for various interphase relative permittivity driven by the volume fraction of nanoparticles and interphase thickness. This numerical model is useful in designing polymer composites to effectively mitigate PD in inverter-fed motor windings.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 1","pages":"239-245"},"PeriodicalIF":2.9,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143106400","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}

引用次数: 0

Highlighting Capacitive Phenomena in the Discharges Propagation on the Insulators Surface Immersed in Fluids 浸没在流体中的绝缘子表面放电传播的电容性现象

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-23 DOI: 10.1109/TDEI.2024.3465459

Abderrahmane Beroual;Abdulaziz Alkuhayli;Usama Khaled

引用次数: 0

The Electrical Conductivity Characteristics of Polyimide During the Thermal Cycle 热循环过程中聚酰亚胺的电导率特性

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-23 DOI: 10.1109/TDEI.2024.3465468

Bingying Chen;Geng Chen;Ruyun Yang;Qilin Han;Tong Li;Cong Wang;Youping Tu

{"title":"The Electrical Conductivity Characteristics of Polyimide During the Thermal Cycle","authors":"Bingying Chen;Geng Chen;Ruyun Yang;Qilin Han;Tong Li;Cong Wang;Youping Tu","doi":"10.1109/TDEI.2024.3465468","DOIUrl":"https://doi.org/10.1109/TDEI.2024.3465468","url":null,"abstract":"2 K/min and even faster rates of thermal cycle environments in low earth orbit alter the electrical conductivity characteristics of polyimide, which may exacerbate charge accumulation and electrostatic discharge (ESD) and seriously threaten the safety of spacecraft. This work focuses on the conductivity characteristics during the thermal cycle by leakage current measurement and demonstrates that the multiple energy levels traps play an important role in conductivity by the thermally stimulated depolarization current (TSDC) measurements. The results show that the current has a nonmonotonic temperature dependence with polar peaks and decreases periodically during the 5 K/min thermal cycle. After 24 thermal cycles, there is a 77.3% reduction in conductivity at 343 K and a 54.0% reduction compared with the 343 K steady-state temperature. The conductivity increases when the thermal cycle rate increases to 10 K/min. The results attribute to the combined effect of nonunidirectional dipole steering, thermally stimulated detrapping effects dominated by the shallower energy levels <inline-formula> <tex-math>$beta _{{1}}$ </tex-math></inline-formula> and <inline-formula> <tex-math>$beta _{{2}}$ </tex-math></inline-formula> traps, and trap-filling effects dominated by the deeper energy levels <inline-formula> <tex-math>$beta _{{3}}$ </tex-math></inline-formula> and <inline-formula> <tex-math>$alpha $ </tex-math></inline-formula> traps. The findings in this study can provide experimental support to reveal the conductivity variation mechanisms in time-varying temperatures.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 1","pages":"231-238"},"PeriodicalIF":2.9,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143106399","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}

引用次数: 0

A Winding-Core High-Frequency Equivalent Circuit Model for Exactly Simulating Partial Discharge Signals Propagation in Transformer 用于精确模拟变压器局部放电信号传播的绕组铁芯高频等效电路模型

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-20 DOI: 10.1109/TDEI.2024.3464581

Zekai Lai;Haibao Mu;Xiaochang Hua;Chenhui Zhou;Haofan Lin;Xianjun Shao;Guanjun Zhang

{"title":"A Winding-Core High-Frequency Equivalent Circuit Model for Exactly Simulating Partial Discharge Signals Propagation in Transformer","authors":"Zekai Lai;Haibao Mu;Xiaochang Hua;Chenhui Zhou;Haofan Lin;Xianjun Shao;Guanjun Zhang","doi":"10.1109/TDEI.2024.3464581","DOIUrl":"https://doi.org/10.1109/TDEI.2024.3464581","url":null,"abstract":"Wideband partial discharge (PD) detection, with its high bandwidth and strong anti-interference capabilities, is an inevitable trend in the development of discharge detection technology. However, the intricate propagation paths and attenuation patterns of high-frequency signals pose challenges for wideband detection of PD, especially in converter transformers. To study the transient response of transformer windings to wideband PD signals, equivalent circuit model is an excellent method. However, conventional equivalent circuit model generally only applies to frequency below 1 MHz. For converter transformers, this equivalent circuit model is insufficient due to strong interference exiting in such frequency band. To solve the problems, this article proposes a winding-core high-frequency equivalent circuit model. Multiple RLC parallel resonant units are added to the circuit model of the interleaved winding, and a transverse capacitance between the high-voltage (HV) winding and the core yoke is also included in the model. Experimental tests on a transformer demonstrate that the improved model can accurately simulate the impedance characteristics of windings up to a frequency of 10 MHz. Compared to the conventional model, the improved model significantly enhances the similarity between simulated signals and measured signals. It can accurately characterize the attenuation of different frequency components within the 10 MHz range, addressing the challenge conventional model faces in simulating signals at the core grounding point.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"1181-1190"},"PeriodicalIF":2.9,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783183","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}

引用次数: 0

Diagnosis and Localization of Moisture Defects in HV Cable Water-Blocking Buffer Layer Based on Characteristic Impedance Variation 基于特性阻抗变化的高压电缆阻水缓冲层湿气缺陷诊断和定位

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-18 DOI: 10.1109/TDEI.2024.3462903

Jingtao Huang;Kai Zhou;Qi Zhao;Yefei Xu;Pengfei Meng;Hao Yuan;Yao Fu;Siyan Lin

{"title":"Diagnosis and Localization of Moisture Defects in HV Cable Water-Blocking Buffer Layer Based on Characteristic Impedance Variation","authors":"Jingtao Huang;Kai Zhou;Qi Zhao;Yefei Xu;Pengfei Meng;Hao Yuan;Yao Fu;Siyan Lin","doi":"10.1109/TDEI.2024.3462903","DOIUrl":"10.1109/TDEI.2024.3462903","url":null,"abstract":"To identify and localize buffer layer moisture defects in high-voltage (HV) cables, this article verifies the effectiveness of the frequency-domain reflectometry (FDR) method theoretically and experimentally by analyzing the impact of moisture on the characteristic impedance of the cable. This article first analyzes the relationship between the electrical parameters of the buffer layer and the characteristic impedance of the cable. Subsequently, the electrical parameters were tested for buffer layer samples at different degrees of moisture, and the characteristic impedance of the cable was calculated. The results indicate that the characteristic impedance of the cable decreases after moisture exposure primarily due to a significant increase in the dielectric constant of the buffer layer. As the degree of moisture increases, the characteristic impedance gradually decreases until it becomes stable. This is mainly due to its rate of change being inversely related to the square of the dielectric constant of the buffer layer. This provides a theoretical basis for the implementation of the FDR method. Finally, this article conducted FDR tests on HV cables with different degrees of moisture, demonstrating that the FDR method can effectively locate buffer layer moisture defects.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"31 6","pages":"3322-3330"},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142261350","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}

引用次数: 0

Performance Evaluation of Insulation Designs for Rotating Machines in More Electric Aircraft 更多电动飞机旋转电机绝缘设计的性能评估

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-17 DOI: 10.1109/TDEI.2024.3462671

Chaofan Yu;Peng Wang;Andrea Cavallini;Yingwei Zhu;Qun Zhou;Shijin Ma;Wenhuan Zhao;Zeng Peng

{"title":"Performance Evaluation of Insulation Designs for Rotating Machines in More Electric Aircraft","authors":"Chaofan Yu;Peng Wang;Andrea Cavallini;Yingwei Zhu;Qun Zhou;Shijin Ma;Wenhuan Zhao;Zeng Peng","doi":"10.1109/TDEI.2024.3462671","DOIUrl":"10.1109/TDEI.2024.3462671","url":null,"abstract":"The increasing dc bus voltage and reduced rise times experienced in aeronautical environments present significant challenges to the insulation systems of rotating machines. These conditions can generate elevated overvoltages, raising the risk of partial discharge (PD) in the insulation of inverter-fed motors utilized in more electric aircraft (MEA). Therefore, the design of the insulation system is critical in MEA development, as it is essential for ensuring safety and reliability. This study investigates the degradation of PD inception voltage (PDIV) and PD extinction voltage (PDEV) in enameled rectangular wires commonly used in rotating machines. The experiments were conducted under conditions of high temperature and low air pressure. Additionally, we compared the performance of corona-resistant (CR) and non-corona-resistant (NCR) materials, both of which have the same specifications, during endurance tests at low air pressure. The results indicate that PD events are more likely to occur under aeronautical conditions, and the use of CR materials at low air pressure poses significant challenges. Finally, we evaluated the performance of two novel insulation designs for MEAs to assess their applicability and limitations for operational use in aeronautical environments.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"1199-1208"},"PeriodicalIF":2.9,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142261351","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}

引用次数: 0