IEEE Transactions on Dielectrics and Electrical Insulation最新文献_第10页

Microscopic Mechanism Effect of Oxygen and Moisture on Pyrolysis of Transformer Insulating Paper 氧气和水分对变压器绝缘纸热解的微观机理影响

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-10 DOI: 10.1109/TDEI.2024.3456771

Haoxi Cong;Shaomin Quan;Xuefeng Hu;Xuan Zhang;Qingmin Li;Mingrong Xu

{"title":"Microscopic Mechanism Effect of Oxygen and Moisture on Pyrolysis of Transformer Insulating Paper","authors":"Haoxi Cong;Shaomin Quan;Xuefeng Hu;Xuan Zhang;Qingmin Li;Mingrong Xu","doi":"10.1109/TDEI.2024.3456771","DOIUrl":"10.1109/TDEI.2024.3456771","url":null,"abstract":"Cellulose paper constitutes a crucial element of oil-paper insulation, crucially influencing the lifespan of transformers. Throughout its aging process, the cellulose paper generates moisture, while the insulating oil contains varying levels of oxygen. Understanding the aging mechanism of cellulose paper necessitates an exploration of the synergistic interplay between moisture and oxygen. This article establishes models incorporating varying moisture, oxygen, and cellobiose concentrations. Molecular dynamics simulations employing the reactive force field (ReaxFF) are employed to investigate the effects of moisture and oxygen addition on the decomposition of cellobiose. The mechanisms underlying the effects of moisture and oxygen on cellobiose decomposition are examined. The changes in the content of the major end products, including H2O, CO2, CO, HCHO, and HCOOH, are also analyzed. It is found that oxygen promotes the formation of C = O bonds and the production of free H from cellobiose. Moisture provides free H and promotes further reactions. The synergistic effect of moisture and oxygen accelerates the aging process of cellulose paper. This investigation provides theoretical support for further research into the aging mechanism of cellulose paper.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"1008-1016"},"PeriodicalIF":2.9,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226980","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

Voltage Endurance Characteristics of Cross-Linked Polyethylene–Silicone Rubber Interface Subjected to DC and AC Voltages 交联聚乙烯-硅橡胶界面在直流和交流电压下的耐压特性

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-10 DOI: 10.1109/TDEI.2024.3456773

Xiaodong Li;Hao Hu;Kairun Song;Zhengxue Wang;Zhidong Jia

{"title":"Voltage Endurance Characteristics of Cross-Linked Polyethylene–Silicone Rubber Interface Subjected to DC and AC Voltages","authors":"Xiaodong Li;Hao Hu;Kairun Song;Zhengxue Wang;Zhidong Jia","doi":"10.1109/TDEI.2024.3456773","DOIUrl":"10.1109/TDEI.2024.3456773","url":null,"abstract":"When designing and inspecting power equipment, it is crucial to consider not only the distinctions between ac, dc, and ac–dc hybrid systems but also the voltage endurance characteristics. However, scientific design and research on the mechanism responsible for the breakdown of solid-solid interfaces (e.g., cable joints), which are weak points in electrical insulation, is lacking. Therefore, in this study, the insulating strength of the interface in relation to the electric field form and voltage endurance time is examined. Specifically, the increase in the insulation strength and the ablation of cross-linked polyethylene–silicone rubber (XLPE–SiR) interfaces are investigated based on the ramped breakdown and step-stress methods. The results illustrate that the dc breakdown strength surpasses the ac breakdown strength, while the ac field fails to reach the composite (ac–dc) electric field breakdown strength. Furthermore, the interfacial breakdown strength is influenced by both long-term and transient stresses. The interfacial breakdown process can be divided into three stages. The breakdown voltage increases in the short term with decreasing step-up rate. Step-stress tolerance experiments and simulations indicate that the highly distorted electric field at asperity contacts leads to cavity discharges and electrothermal losses, resulting in the ablation of the asperities on the rough surface. The electric field distortion decreases with decreasing interface roughness, leading to an increase in breakdown strength. Moreover, as the endurance time increases, the improvement of the ac breakdown strength is more significant than that of the composite electric field, while the dc breakdown strength shows the least improvement.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"690-698"},"PeriodicalIF":2.9,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212989","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

Effect of Isotacticity on Thermal Oxidative Aging Performance of Polypropylene Films for HVDC Capacitors 异构性对高压直流电容器用聚丙烯薄膜热氧化老化性能的影响

IF 3.1 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-10 DOI: 10.1109/tdei.2024.3456786

Meng Xiao, X. D. Du, B. X. Du

引用次数: 0

A Novel Dual-Stage Semi-Supervised Learning Model for Fault Diagnosis in Transformers with Limited Imbalanced Labeled Data 利用有限的不平衡标记数据进行变压器故障诊断的新型双阶段半监督学习模型

IF 3.1 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-10 DOI: 10.1109/tdei.2024.3456777

Yanfei Sun, Tao Zhao, Shuguo Gao

引用次数: 0

A New Nondestructive Aging Characterization Method for Oil-Paper Insulation Based on the Transmission Characteristics of Complementary Split Ring Resonator 基于互补分环谐振器传输特性的油纸绝缘无损老化表征新方法

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-10 DOI: 10.1109/TDEI.2024.3457742

Mi Xiao;Gaoyan Yang;Wei Zhang

{"title":"A New Nondestructive Aging Characterization Method for Oil-Paper Insulation Based on the Transmission Characteristics of Complementary Split Ring Resonator","authors":"Mi Xiao;Gaoyan Yang;Wei Zhang","doi":"10.1109/TDEI.2024.3457742","DOIUrl":"10.1109/TDEI.2024.3457742","url":null,"abstract":"A novel method is proposed for the simple nondestructive characterization of the aging degree of oil-paper insulation materials based on a complementary split ring resonator (CSRR) in this article. Samples of oil-paper insulation are aged under different circumstances by accelerated thermal aging experiment. After that, the traditional characterization methods such as the acid value of insulating oil, the polymerization degree of insulating paper, the Raman spectra test of the insulating oil, microscopic characterization of insulating paper, and dielectric constant of the samples are tested to characterize the aging degree of the samples. In order to find a new way to make the characterization more convenient, microstrip line sensors with CSRR are prepared, and the resonant frequency deviation (<inline-formula> <tex-math>$Delta {f},$ </tex-math></inline-formula>) of the sensor loaded with insulating oil and insulating cardboard samples before and after aging are tested to show the effect of aging time and temperature on the aging degree. The experimental results show that the method proposed in this article can reflect the aging trend of oil-paper insulation to a certain extent.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 1","pages":"334-341"},"PeriodicalIF":2.9,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212870","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

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-10 DOI: 10.1109/TDEI.2024.3457594

Zhihang Zhao;Zhen Wang;Zemin Duan;Yangyang Fu

{"title":"Dynamical Similarity of Streamer Propagation in Geometrically Similar Combined Air Gaps","authors":"Zhihang Zhao;Zhen Wang;Zemin Duan;Yangyang Fu","doi":"10.1109/TDEI.2024.3457594","DOIUrl":"10.1109/TDEI.2024.3457594","url":null,"abstract":"Similarity methods are useful tools for correlating gas discharge characteristics at different dimensional scales, which aid in designing tests using reduced models for extrapolating original full-dimensional scale discharges that are either experimentally expensive or practically unachievable. In this article, based on a 2-D fluid model, we investigated the validity of similarity laws for streamer propagation in combined air gaps, which have a floating metal structure between the high voltage and ground electrodes. The dynamic similarities of high-pressure streamer propagation inside combined air gaps are demonstrated by keeping the product of geometrical length and gas pressure constant in the original and downscaled gaps. The streamer propagation represented by the electron source term and the streamer velocity in single and combined gaps are obtained and compared, which also confirms the influence of floating metal on streamer characteristics. Temporal behaviors of the streamer propagation represented by the electron density distributions are found to be rather the same, which validates the dynamic streamer similarity. In addition, the simulation results show that similarity properties could be undermined by the photoionization effect whereas its impact can be excluded if the quenching pressure of the photoionization source term is linearized. By further excluding the nonlinear processes, such as the three-body electron attachment process, similarity laws are more rigorously verified. The results from this study confirm the applicability of similarity laws for streamer discharge in combined air gaps under designed conditions, which are beneficial for the exploration and conduction of downscaled aircraft ground tests for simulating lightning strike effects.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"1017-1026"},"PeriodicalIF":2.9,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212992","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

Nanosecond Current Waveforms With Small Discharge Gaps in Needle-Plane Electrode Over Three Kinds of Polymer Film 针平面电极在三种聚合物薄膜上的纳秒级电流波形与小放电间隙

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-09 DOI: 10.1109/TDEI.2024.3456104

Tatsuki Okamoto;Hiroaki Uehara

{"title":"Nanosecond Current Waveforms With Small Discharge Gaps in Needle-Plane Electrode Over Three Kinds of Polymer Film","authors":"Tatsuki Okamoto;Hiroaki Uehara","doi":"10.1109/TDEI.2024.3456104","DOIUrl":"10.1109/TDEI.2024.3456104","url":null,"abstract":"The nanosecond partial discharge (PD) currents have become increasingly important with the recent development of large power modules used in automobile drive mechanisms and other high-temperature equipment. Those modules are sometimes operated at frequencies higher than normal power frequencies, making it crucial to analyze the PD characteristics at these elevated frequencies. Measuring PD characteristics with a small gap, less than <inline-formula> <tex-math>$100~mu $ </tex-math></inline-formula> m, has also become essential due to system compactization. PD currents typically flow in a few tens of nanoseconds; hence, the wire length of the current measurement circuit should be sufficiently short. The electrode system employed in this study consists of a simple needle-plane electrode with small discharge gaps of 0, 12.5, 25, 50, 75, 100, and <inline-formula> <tex-math>$150~mu $ </tex-math></inline-formula> m. The needle diameter is 1 mm with a tip radius of <inline-formula> <tex-math>$300~mu $ </tex-math></inline-formula> m. The total length of the PD current-flow circuit is set to be less than approximately 150 mm. We measure nanosecond PD pulse current waveforms using a digital oscilloscope with an ac peak voltage of 2000 V at 50–1000 Hz. PD current forms were observed over polyimide (PI), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN) films, widely used as insulating films. The PD current waveforms over PI, PET, and PEN films exhibited approximately 5 ns peak time for both positive and negative pulses, with a pulsewidth time at half height of the peak value ranging from about 5–15 ns. These times vary depending on the material kind and discharge gap length. The frequency dependence of those times showed little change over applied voltage frequencies. Moreover, new time-domain NMR analyses correlate the current waveform differences with the dipole movement affected by the trapped charges.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 1","pages":"375-382"},"PeriodicalIF":2.9,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212898","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

Trap Distribution and Along-Surface Discharge Characterization of Aromatic Compound-Modified Silicone Gel 芳香族化合物改性硅凝胶的俘获分布和沿表面放电表征

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-09 DOI: 10.1109/TDEI.2024.3456096

Jian Wang;Wei Wu;Yuxuan Song;Chengzhi Hou;Hanwen Ren;Rakhmonov Ikromjon Usmonovich;Qingmin Li

{"title":"Trap Distribution and Along-Surface Discharge Characterization of Aromatic Compound-Modified Silicone Gel","authors":"Jian Wang;Wei Wu;Yuxuan Song;Chengzhi Hou;Hanwen Ren;Rakhmonov Ikromjon Usmonovich;Qingmin Li","doi":"10.1109/TDEI.2024.3456096","DOIUrl":"10.1109/TDEI.2024.3456096","url":null,"abstract":"Insulated gate bipolar transistor (IGBT) module is prone to the along-surface discharge at the silicone gel-metal electrode-AlN ceramic substrate, that is, the “triple bonding point,” resulting in insulation breakdown, so it is important to develop high-performance silicone gel. In this article, the composite materials with different contents of 4,4’-dichlorobenzophenone (DCBP) are prepared and their trap distribution and along-surface discharge characteristics are investigated. The results show that the introduction of DCBP reduces the density of deep trap, increases the density of shallow trap and the degree of crosslinking, is more conducive to the detrapping and migration of charge, and accelerates the attenuation of the surface potential of the composite. Under the condition of sinusoidal voltage of 7 kV and frequency of 10 kHz, the composite material can effectively inhibit the development of the along-surface discharge compared with PSG, and the total discharge times are reduced by 65.08%, 48.71%, and 18.27%, respectively. The total discharge range decreases by 69.15%, 62.87%, and 22.88%, and the average discharge range decreases by 25.61%, 27.63%, and 5.64%, respectively. The release of ultraviolet energy during along-surface discharge excites DCBP to a triplet state, promotes the improvement of crosslinking degree and the generation of new re-crosslinking products, prevents the growth of local low-density insulation region, and further inhibits the occurrence of the along-surface discharge, which enhances the insulation performance of the composite.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"823-832"},"PeriodicalIF":2.9,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212871","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

Small-Sample GIS Partial Discharge-Type Identification Method Based on Fusion of 1-D AT-DRSN and IDRN Models 基于一维 AT-DRSN 和 IDRN 模型融合的小样本 GIS 部分放电类型识别方法

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-06 DOI: 10.1109/TDEI.2024.3455314

Baiqiang Yin;Yahong Zeng;Ruoyu Wang;Lei Zuo;Bing Li;Zhen Cheng

{"title":"Small-Sample GIS Partial Discharge-Type Identification Method Based on Fusion of 1-D AT-DRSN and IDRN Models","authors":"Baiqiang Yin;Yahong Zeng;Ruoyu Wang;Lei Zuo;Bing Li;Zhen Cheng","doi":"10.1109/TDEI.2024.3455314","DOIUrl":"10.1109/TDEI.2024.3455314","url":null,"abstract":"Different types of partial discharges (PDs) in gas-insulated switchgear (GIS) cause different degrees of GIS insulation damage, and correct PD identification is critical to GIS insulation status. This article proposes a multimodel fusion PD pattern recognition method based on 1-D adaptive transfer deep residual shrinkage network (AT-DRSN) and improved deep residual network (IDRN), which fully utilizes PD time-domain waveform images generated from field inspection. First, the finite-difference time-domain (FDTD) method and mathematical models are used to simulate GIS PDs, and the time-domain waveform image datasets of four typical PD defects are established. Second, the network model is built based on time-domain feature sequences and time-order feature parameters, respectively, and effectively combined with the transfer learning method, and finally, the AT-DRSN and IDRN models are weighted and fused for PD pattern recognition. The results show that the model proposed in this article can effectively achieve high-precision diagnosis of small-sample GIS PDs, with a recognition accuracy of 98.3%, and the accuracy under strong noise is still greater than 95%, which has higher accuracy and anti-interference performance compared with other methods and is of reference value for small-sample PD recognition in the field.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"32 2","pages":"877-886"},"PeriodicalIF":2.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212873","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

Acoustic Emission Property of Cylindrical Cavity Discharge in Power Cable 电力电缆中圆柱腔放电的声发射特性

IF 2.9 3区工程技术

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-06 DOI: 10.1109/TDEI.2024.3455321

Pengfei Wang;Hongjuan Zhang;Pengwei Guo;Juan Chen;Yan Gao;Yu Wang;Baoquan Jin

{"title":"Acoustic Emission Property of Cylindrical Cavity Discharge in Power Cable","authors":"Pengfei Wang;Hongjuan Zhang;Pengwei Guo;Juan Chen;Yan Gao;Yu Wang;Baoquan Jin","doi":"10.1109/TDEI.2024.3455321","DOIUrl":"10.1109/TDEI.2024.3455321","url":null,"abstract":"The acoustic emission property and transient process of cylindrical cavity discharge is comprehensively modeled and validated for power cable in this article. An electrostatic field model is established to analyze the discharge duration and power density varying with discharge magnitude and cylindrical cavity height. The relationship between the acoustic source and PD activity is constructed through discharge power density and duration. Furthermore, a transient model for acoustic wave propagation in a multilayer power cable is established. Numerical analysis with finite element analysis is conducted to analyze the effects of different discharge magnitudes under the same cavity height and different cavity heights under the same discharge magnitude on the acoustic waves at the surface of the power cable. The simulation reveals that higher discharge magnitude results in greater intensity of the acoustic wave and longer cavities result in lower acoustic frequencies. Ultimately, a series of validation experiments are implemented to acquire the statistical acoustic characteristics. The intensity of acoustic wave is positively correlated with the discharge magnitude in R-square of 0.9895, while the frequency is negatively correlated with cavity height in R-square of 0. 9589.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":"31 5","pages":"2701-2710"},"PeriodicalIF":2.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212872","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