2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)最新文献_第8页

Investigation of Inverse Temperature Effects During Thermal-Radiation Aging of Semicrystalline Cable Insulation 半晶电缆绝缘热辐射老化过程中的逆温度效应研究

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI: 10.1109/CEIDP55452.2022.9985318

Y. Ni, A. Sriraman, Donghui Li, Ikumi Ellis, L. Fifield

引用次数: 1

Comparison of Charge Mobility in Insulating Oil and Oil-immersed Paper 绝缘油和油浸纸中电荷迁移率的比较

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI: 10.1109/CEIDP55452.2022.9985365

Lu Gao, Yang Wu, Jiaxi Chen, Z. Lv, Kai Wu

{"title":"Comparison of Charge Mobility in Insulating Oil and Oil-immersed Paper","authors":"Lu Gao, Yang Wu, Jiaxi Chen, Z. Lv, Kai Wu","doi":"10.1109/CEIDP55452.2022.9985365","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985365","url":null,"abstract":"Oil-paper insulation is the main insulation of converter transformers. To understand the charge transportation process in oil-paper insulation, the charge mobility in insulating oil and oil-immersed paper is measured based on PEA method. The positive charge mobility of insulating oil is dozens of times higher than that of oil-immersed paper, and the negative charge mobility of insulating oil is hundreds of times higher than that of oil-immersed paper, wherefore a large amount of charge accumulates at oil-paper interface under DC voltage. The SEM images show that the fiber of the ordinary insulating paper sample has more defects than the heat-resistant insulating paper sample, resulting in more deep traps distributed in the body and surface, which not only causes the lower charge mobility, but also makes it more difficult for the trapped charges at oil-paper interface to escape. Both of the charge mobility and the surface state of oil-immersed paper have an important influence on the charge transport at oil-paper interface. Moderately improving the charge mobility in oil-immersed paper and reducing the fiber defects of insulating paper are beneficial to suppress the charge accumulation at oil-paper interface.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"15 11-12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123621661","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 Temperature Gradient on Electrical Tree Growth with Harmonic Superimposed DC Voltage 温度梯度对谐波叠加直流电压下电树生长的影响

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI: 10.1109/CEIDP55452.2022.9985348

R. Xue, Fan Li, Qi Li, Yifang Wang, X. Kong, Boxue Du

{"title":"Effects of Temperature Gradient on Electrical Tree Growth with Harmonic Superimposed DC Voltage","authors":"R. Xue, Fan Li, Qi Li, Yifang Wang, X. Kong, Boxue Du","doi":"10.1109/CEIDP55452.2022.9985348","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985348","url":null,"abstract":"Ethylene propylene diene monomer (EPDM) is the main insulating material of HVDC cable accessories. In actual operation, temperature gradient $(Delta T)$ and harmonic voltage are significant problems that threaten the insulation safety. In this paper, electrical trees within EPDM at $Delta T$ varying from -90 to 90°C are studied with 8kV, 50Hz harmonic superimposed -10 or 10kV DC voltage. Thermal and electric field distribution are discussed to explain the tree structure under different $Delta T$. It is concluded that both negative and positive $Delta T$ can promote the growth of electrical tree, but lead to different tree characteristic; including length, accumulation damage and treeing time. Under positive $Delta mathrm{T}$, increased temperature and decreased electric field near needle tip cause the electrical trees shorter but produce more deterioration countertraded in the high temperature area. With harmonic superimposed negative DC voltage, electrical trees show denser branches but slower growing rate, which may be because of the properties of charge carriers with different polarities that more electrons can be injected and form a space charge layer under negative DC voltage.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128859148","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

Study on the Numerical Simulation of Rime Accretion under DC Electric Field 直流电场作用下雾凇吸积数值模拟研究

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI: 10.1109/CEIDP55452.2022.9985257

Tianqi Yu, Liming Wang, F. Yin, Xingliang Jiang, M. Farzaneh

引用次数: 0

The Discharge Mode of SF6N2 Gas Mixture in Extremely Inhomogeneous Electric Field under Power Frequency Voltage 工频电压下SF6N2混合气体在极不均匀电场中的放电模式

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI: 10.1109/CEIDP55452.2022.9985344

Qingyun Chen, Zhicheng Wu, Fangji Liu, Fan Yun, Dexing Liu, Jiasheng Fan, Qiaogen Zhang, Chao Gao

{"title":"The Discharge Mode of SF6N2 Gas Mixture in Extremely Inhomogeneous Electric Field under Power Frequency Voltage","authors":"Qingyun Chen, Zhicheng Wu, Fangji Liu, Fan Yun, Dexing Liu, Jiasheng Fan, Qiaogen Zhang, Chao Gao","doi":"10.1109/CEIDP55452.2022.9985344","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985344","url":null,"abstract":"SF$_{6}/text{N}_{2}$ gas mixture has been used as insulated medium in power equipment, but the breakdown characteristics and the discharge mode of SF$_{6}/text{N}_{2}$ gas mixture in extremely inhomogeneous electric field under power frequency voltage are not clear, which will threaten the stable operation of power equipment. The experiment was based on the fully enclosed power frequency experimental device, which includes inflatable power frequency transformer, experimental chamber, control and measurement system. The synchronous camera was used to capture the pre-discharge images of SF$_{6}/text{N}_{2}$ gas mixture in needle-plate electrode. The results show that the relationship between the breakdown voltage of the SF$_{6}/text{N}_{2}$ gas mixture and the pressure also has the ‘hump’ phenomenon in extremely inhomogeneous electric field. In the hump area, the leader stepping was observed obviously in the discharge images, and the leader stepping is closely related to the low probability breakdown of the gap, that is, the streamer channel is transformed into leader channel, then the secondary streamer is generated at the head of the leader channel, and the leader channel is continuously stepping to the plate electrode. With the increase of voltage, there is a uniform discharge area at the head of the needle electrode, which prevents the development of the leader channel and leads the increase of breakdown voltage. The leader channel has a tendency to bypass the uniform discharge area and develop from both sides of the needle electrode to the plate electrode, causing breakdown finally.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130028620","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

Insulation Failure Mechanism of Dielectric Film for Power Capacitor in Strong Electromagnetic Field 强电磁场下电力电容器介质薄膜的绝缘失效机理

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI: 10.1109/CEIDP55452.2022.9985303

Haoliang Liu, B. Du, M. Xiao, Ke Chen

引用次数: 0

Analysis of Polypropylene Surface Discharge Characteristics with Pulse Sequence Analysis 脉冲序列分析聚丙烯表面放电特性

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI: 10.1109/CEIDP55452.2022.9985389

Jianhong Song, Zpeng Lv, Yihe Li, Zhenyu Wu, Kai Wu, Yonghong Cheng

{"title":"Analysis of Polypropylene Surface Discharge Characteristics with Pulse Sequence Analysis","authors":"Jianhong Song, Zpeng Lv, Yihe Li, Zhenyu Wu, Kai Wu, Yonghong Cheng","doi":"10.1109/CEIDP55452.2022.9985389","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985389","url":null,"abstract":"The generation and development of surface discharge is an important insulation problem to traditional high voltage equipment. And the triple junction of the device are often the weakness of surface discharge. In order to further improve the insulation stability of high voltage equipment, the research of surface discharge is very important. There are many people who have studied the generation and development of surface discharge from different aspects. Some of them have proposed new analysis methods. In order to acquire more detailed discharge information, the phase resolved PD (PRPD) pattern and pulse sequence analysis (PSA) are used to analyze surface discharge process. A method of estimating the PD inception and extinction voltages based on the PD signals are used in surface discharge. In this paper, by measuring the surface discharge of polypropylene film in air, the dV-dV plot, the number of PDs per cycle and PD inception and extinction voltage of different stages of surface discharge are studied. And the influence of different electrode distance on surface discharge are also be studied.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126631243","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

Low-cost impedance analyzer and IDC sensors: an imperfect tool for dielectric condition monitoring 低成本阻抗分析仪和IDC传感器:一种不完善的介质状态监测工具

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI: 10.1109/CEIDP55452.2022.9985260

I. Preda, M. Colautti, A. Pernet, L. Zeng

引用次数: 0

Temperature Effect on Electrical Aging Model for Field-Aged Oil Impregnated Paper Insulation 温度对现场老化油浸纸绝缘电老化模型的影响

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI: 10.1109/CEIDP55452.2022.9985251

Devayan Basu, B. Gholizad, R. Ross, S. M. Gargari

{"title":"Temperature Effect on Electrical Aging Model for Field-Aged Oil Impregnated Paper Insulation","authors":"Devayan Basu, B. Gholizad, R. Ross, S. M. Gargari","doi":"10.1109/CEIDP55452.2022.9985251","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985251","url":null,"abstract":"The time-to-failure for oil-impregnated paper (OIP) insulation is governed by two primary aging mechanisms: electrical and thermal. The electrical life can be represented as an Inverse Power Law, where lifetime is inversely proportional to applied electric field. The process of thermal aging on the other hand is established by Arrhenius Law, which relates the rate of aging exponentially to temperature. Due to thermal aging, the structure of insulation is altered owing to chemical changes like oxidation, polymerization, and cellulose degradation. For life estimation of a service-aged high-pressure gas filled (HPGF) cables, electrical endurance tests are normally performed at controlled voltage levels to estimate the time to breakdown. However, it is equally necessary to investigate how thermal aging influence changes in the electrical life of insulation. Therefore, in this paper, firstly short-term ramped stress tests are carried out on elevated thermal aged OIP samples extracted from already field-aged HPGF to find a rough estimate of breakdown voltages at different temperatures. Then, long-term electro-thermal step stress tests are performed on the samples to establish a correlation of temperature on the electrical life of the OIP insulation. The long-term stress tests produce reliable breakdown statistics and Maximum Likelihood Estimation of Inverse Power Law fitted on 2-parameter Weibull distributed breakdown data indicate a reduction of model parameter, n from 13.61 to 7.38 with an increase in temperature from 45 to 75 °C and a constant shape factor, $beta$ of 1.50. The dissipation factor, tan$delta$ related to the aging also shows an increase with temperature across a wide frequency range and is inversely proportional to the breakdown voltage.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130364503","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: 1

Compatibility Test of Coatings with Natural Ester at Elevated Temperature for Transformers 变压器用涂层与天然酯的高温相容性试验

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI: 10.1109/CEIDP55452.2022.9985337

Qingdan Huang, Haoyong Song, Ziyong Li, Wei Wang, Huihong Huang

{"title":"Compatibility Test of Coatings with Natural Ester at Elevated Temperature for Transformers","authors":"Qingdan Huang, Haoyong Song, Ziyong Li, Wei Wang, Huihong Huang","doi":"10.1109/CEIDP55452.2022.9985337","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985337","url":null,"abstract":"Natural esters are widely used as insulating liquids due to their higher fire safety and environmental safety. The method generally used to evaluate the compatibility of construction materials with mineral insulating oil is according to the standard ASTM D3455. As natural esters can be applied to high-temperature insulation systems for transformers according to IEC 60076-14, the test temperature 100 °C indicated in ASTM D3455 will no longer meet the requirements of the specific application of natural esters. In this paper, three types of coatings used in soybean natural ester transformers have been tested. The testing temperature met the insulating liquid/kraft paper system. The testing duration was increased to multiples of 168 h (7 days), and the highest was 1008 h. Not only the insulating liquids were analyzed before and after the heating process, but also coatings were analyzed which were not required in ASTM D3455. The changing of liquid composition was also observed and analyzed. Throughout the experiment, except colour, dielectric dissipation factor, breakdown voltage, water content and interfacial tension of insulating liquids, hardness of coatings and breakdown voltage of enamelled wire were also important properties to evaluate the compatibility of construction materials with natural esters. This study will support the new proposal of the “IEC 63177 Test method for compatibility of construction materials with electrical insulating liquids” standard.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133739750","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: 1