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IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena最新文献

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Coupled transient finite element and boundary element method modeling of nonlinear, nonhomogeneous, electric field devices with mesh refinement 非线性非均匀电场器件的网格细化瞬态有限元与边界元耦合建模
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-12-01 DOI: 10.1109/CEIDP.1997.641117
M. Driga, A. Wu
{"title":"Coupled transient finite element and boundary element method modeling of nonlinear, nonhomogeneous, electric field devices with mesh refinement","authors":"M. Driga, A. Wu","doi":"10.1109/CEIDP.1997.641117","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641117","url":null,"abstract":"This paper introduces the structures of 2-D and 3-D finite and boundary element methods codes for calculating electric field strength distribution in high voltage insulation systems in arrangements with complex boundaries. A very accurate representation of the space distribution of electrical fields, varying in time as the combined effect of the circuit parameters, modulated by diffusion and time changing properties of the dielectric materials can be the basis for a global performance criterion for the system, large enough to represent the complexity of the phenomena, but still simple to be meaningful. Also, the paper describes a promising technique for rezoning the mesh in order to achieve a high resolution in critical areas of high field strength.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"169 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114113987","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
Role of voltage zero-crossing in propagation of water trees 电压过零在水树繁殖中的作用
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-12-01 DOI: 10.1109/CEIDP.1997.634618
S. Mukai, H. Suzuki, Y. Ohki, Y. Nakamichi, K. Ajiki, Y. Li
{"title":"Role of voltage zero-crossing in propagation of water trees","authors":"S. Mukai, H. Suzuki, Y. Ohki, Y. Nakamichi, K. Ajiki, Y. Li","doi":"10.1109/CEIDP.1997.634618","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.634618","url":null,"abstract":"Water tree characteristics have been investigated for low-density polyethylene by applying power-frequency ac voltages with high-frequency components, which are simulated output voltages of a pulse-width-modulation inverter. If we compare the water-tree length among single-frequency voltages, the water tree grows faster if the frequency is higher. However, if we superpose a power-frequency voltage onto the high-frequency voltage, the tree growth is suppressed. The tree length becomes shorter if the superposed power-frequency voltage is higher. This surprising result is explainable by considering that the zero-crossing of the applied voltage plays an important rule for the tree propagation. In case that the high-frequency voltage is superposed onto a dc voltage, the de voltage seems not to have any influence to the tree growth. This result can be also explained by considering the number of voltage reversals at the tree tip.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129095313","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: 2
Numerical treatment of a transient, nonlinear, metal-ferroelectric insulator-metal system using a finite element/boundary element numerical code 瞬态非线性金属-铁电绝缘体-金属系统的有限元/边界元数值处理
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-12-01 DOI: 10.1109/CEIDP.1997.641116
A. Wu, M. Driga
{"title":"Numerical treatment of a transient, nonlinear, metal-ferroelectric insulator-metal system using a finite element/boundary element numerical code","authors":"A. Wu, M. Driga","doi":"10.1109/CEIDP.1997.641116","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641116","url":null,"abstract":"The recent interest in capacitor structures, having as dielectric a series of compounds with distorted perovskite topologies of both decentration of ion B in oxygen octahedra and, with gathering of oxygen octahedra, has led to the need for a better quantitative macroscopic evaluation, not only for nonlinearity and anisotropy of such ferroelectric structures, but also for the transient behavior of their electric field distribution. This paper is the first in a series attempting to use advanced Finite Element Method (FEM) and Boundary Element Method (BEM) numerical codes, as well as the latest technology in massive numerical processing, to give a quantitative picture of the transient phenomena in ferroelectrics with distorted, perovskite topologies as dielectrics between layers of metal, starting, initially, only with the treatment of the nonlinearity in transient regimes and adding, later, the anisotropy and tensorial approach, and trying to reconcile the experimental and theoretical data with the numerical results.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"3 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134300805","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
Charge density distribution in electrohydrodynamics of insulating liquids 绝缘液体电流体动力学中的电荷密度分布
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.641173
R. Chicón, A. Castellanos, E. Martin
{"title":"Charge density distribution in electrohydrodynamics of insulating liquids","authors":"R. Chicón, A. Castellanos, E. Martin","doi":"10.1109/CEIDP.1997.641173","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641173","url":null,"abstract":"The problem of the charge distribution in the finite-amplitude electroconvection of a layer of insulating liquid subjected to unipolar injection has been solved by a particle-type method, both in the weak and strong injection regimes. A close link has been found between the fact that finite-amplitude electroconvection is time dependent and the existence of a small fluctuating amount of residual charge in regions of the convective cells that would otherwise be almost empty of charge. An accurate calculation of the electric field, including the coulomb repulsion between the injected charge carriers, has proven to be essential for the obtaining of these results.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115453779","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: 2
Analysis and suppression of interference for on-line monitoring of partial discharge of power transformers 电力变压器局部放电在线监测干扰分析与抑制
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.641128
Changchang Wang, X. Jin, T. Cheng, Shibo Zhang, Z. Dong, Zhongdong Wang, D. Lin, Deheng Zhu
{"title":"Analysis and suppression of interference for on-line monitoring of partial discharge of power transformers","authors":"Changchang Wang, X. Jin, T. Cheng, Shibo Zhang, Z. Dong, Zhongdong Wang, D. Lin, Deheng Zhu","doi":"10.1109/CEIDP.1997.641128","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641128","url":null,"abstract":"The key to on-line partial discharge (PD) monitoring of power transformers is how to suppress interference effectively. This paper reports an interference qualitative and quantitative analysis on site using a Fast Fourier Transform (FFT) technique. Various periodic interferences have been found, which emanated from the carrier communication, thyristor switching, and high frequency protection signals of the power system as well as radio broadcasting signals. LMS adaptive digital filters and FFT threshold digital filters can be used to eliminate continuous periodic noises for on-line PD monitoring. However, they suffer from their own intrinsic weaknesses. Therefore, a multi-band-pass digital filter based on FFT has been developed. It is an much better method for suppressing continuous periodic interferences.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"73 21","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120874697","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
Quantitative estimates of characteristic values involved in quasiparticle conduction in dielectric liquids 介电液体中准粒子传导特性值的定量估计
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.641175
A. Watson
{"title":"Quantitative estimates of characteristic values involved in quasiparticle conduction in dielectric liquids","authors":"A. Watson","doi":"10.1109/CEIDP.1997.641175","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641175","url":null,"abstract":"A brief theoretical treatment is made of the role played by the Debye length in the description of the scale of diffusion of electrons to form a gradient of electron density in a population of trapped electrons, /spl rho//sub e/. From this treatment a calculation is made of the total number of electrons, N, contained within the Debye sphere, which, for silicone oil, is 4000. The binding energy of these, from experimental data is 24 kV and thus each electron is held within the sphere in the form of a quasiparticle with an energy of 6 eV. This data is used to evaluate the Debye length, /spl lambda/=0.4 mm and the density of electrons as 10/sup 7/ cm/sup -3/. The scale of this is shown to be consistent with the emergence of the beltramion quasiparticles from the cathode double layer in the high field regime of the Ostroumov plot.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127140636","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
Surface resistance of PVC in the presence of salt-fog 盐雾存在时聚氯乙烯的表面电阻
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.634578
Hui Zhang, R. Hackam
{"title":"Surface resistance of PVC in the presence of salt-fog","authors":"Hui Zhang, R. Hackam","doi":"10.1109/CEIDP.1997.634578","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.634578","url":null,"abstract":"Polymer materials are increasingly being used in a wide range of applications in outdoor and indoor insulation. The aging of polymeric insulation is influenced by the presence of moisture and contamination which gradually change the property of the surface from being hydrophobic into hydrophilic. The modified surface then permits the development of dry band arcing that leads to flashover. It has been suggested that measurements of the surface resistance of insulators in situ might offer a convenient method to characterize its electrical property and thus its performance under operating conditions. In the present paper the surface resistance and the contact angle of polyvinyl chloride (PVC) rod specimens are measured in the presence of salt fog. The dependence of the surface resistance on such parameters as the duration of the wetting, the applied electric stress, the length of the specimen rod and on the time subsequent to die removal from the fog chamber is reported. The contact angle is also measured and is correlated with the surface resistance. The diffusion coefficient of the saline solution into the PVC is determined.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125298227","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: 4
Evolution of the streaming current generated by an oil flow through a pressboard-application to flow electrification in power transformers 油流通过压板产生的流动电流的演变——在电力变压器流动通电中的应用
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.641168
E. Moreau, T. Paillat, G. Touchard
{"title":"Evolution of the streaming current generated by an oil flow through a pressboard-application to flow electrification in power transformers","authors":"E. Moreau, T. Paillat, G. Touchard","doi":"10.1109/CEIDP.1997.641168","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641168","url":null,"abstract":"In high power transformers, pressboard and oil are needed for electrical insulation. Added to that, the oil is using as a cooler fluid of the system. Furthermore, during this last decade, the phenomenon of flow electrification at the oil-pressboard interface region is suspected to be at the origin of several damages occurring in power transformers, as well in Europe, North America or Japan. Thus as these phenomena are strongly in correlation with the physico-chemical processes at the interface, the goal of this experimental study is to characterize the streaming current intensity in function of the electrochemical and morphological properties of the pressboard. For this, the streaming current and the mean space charge density generated by an oil flow through a non degraded pressboard and pressboards degraded by electrical discharges have been characterized. The results show that the electrochemical modifications of the oil-pressboard interface highly enhances the flow electrification of the oil.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122675857","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: 7
Relationship between field emission current characteristic and electrical breakdown in vacuum 真空场发射电流特性与电击穿的关系
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.641145
D. Makabe, M. Sone, H. Mitsui, E. Takahashi, A. Ebe, K. Ogata
{"title":"Relationship between field emission current characteristic and electrical breakdown in vacuum","authors":"D. Makabe, M. Sone, H. Mitsui, E. Takahashi, A. Ebe, K. Ogata","doi":"10.1109/CEIDP.1997.641145","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641145","url":null,"abstract":"It has been assumed that an electrical breakdown in vacuum is caused by field emission electrons emitted from a cathode surface. And these field emission electrons emitted from microprotrusions on the cathode surface. It has been recognized that this electron's current is expressed by F-N theory. Therefore, it is thought that a characteristic of a field emission current has influence on the electrical breakdown in vacuum. In this study, the electrical breakdown voltage in vacuum gap was measured in order to investigate whether the correlation exists between this voltage and the characteristic of the field emission current. At this time, the field emission current was measured from appearance of electron to just before electrical breakdown in vacuum, by using a Micro Channel Plate (MCP) and a pico-ammeter. As the result, it is guessed that the characteristic of field emission current has influence on the electrical breakdown. Because the applied voltage to keep the same field emission current correlates to the electrical breakdown voltage in all cathodes when the field emission current is near to the electrical breakdown.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114474797","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: 3
Self-healing breakdown characteristics of polyimide thin films-effect of ambient gas on breakdown characteristics 聚酰亚胺薄膜自愈击穿特性——环境气体对击穿特性的影响
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.634583
Y. Muramoto, M. Nagao, M. Kosaki
{"title":"Self-healing breakdown characteristics of polyimide thin films-effect of ambient gas on breakdown characteristics","authors":"Y. Muramoto, M. Nagao, M. Kosaki","doi":"10.1109/CEIDP.1997.634583","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.634583","url":null,"abstract":"We have been studying the breakdown characteristics of polyimide (PI) thin films to try and take advantage of self-healing breakdown. This paper focuses on the effect of ambient gas (SF/sub 6/, N/sub 2/, O/sub 2/ and dry air) on breakdown characteristics of PI thin films. At room temperature, electric strength (Fb) in SF/sub 6/ is higher than in other gases. The Fb in dry air fell significantly just after the polarity reversal of the applied voltage and then gradually increased with the number of breakdowns. However, the Fb in SF/sub 6/ and N/sub 2/ retained nearly the same value after the polarity reversal. The Fb in the mixed gas of N/sub 2/ and O/sub 2/ fell after polarity reversal and decreased with increase of oxygen concentration. This is probably due to the fact that the ambient gas affects space-charge formation in PI thin films, Because it is a porous structure, the possibility of breakdown characteristics of ambient gas-PI thin film composite system may be taken into account.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129567783","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
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