1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)最新文献_第4页

Dynamism of interconnected channels in water treed polyethylene under a constant voltage 恒电压下水树聚乙烯互联通道的动力学研究

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807846

J. Kawai, M. Ogishima, J. Shinagawa, S. Nakamura, G. Sawa

{"title":"Dynamism of interconnected channels in water treed polyethylene under a constant voltage","authors":"J. Kawai, M. Ogishima, J. Shinagawa, S. Nakamura, G. Sawa","doi":"10.1109/CEIDP.1999.807846","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.807846","url":null,"abstract":"As the ac loss current containing higher order harmonic waves is able to be detected even in a non-penetrated water treed sample, the detection of the 3rd harmonic wave has a potential for the diagnosis of CV cables. The authors have presented a model where current density j through channels interconnecting micro-voids is assumed to depend on electric field E asj=(/spl sigma//sub 0//h)/spl middot/sinh (h/spl middot/E), where h is a parameter which characterizes the electric field dependence of j and /spl sigma//sub 0/ is the conductivity in low electric fields. Currents of the fundamental and 3rd harmonic waves estimated by Fourier analysis have been numerically calculated by solving a non-linear differential equation of the equivalent circuit based on the model. The numerical results give a good agreement with the changes of the observed magnitudes of fundamental and 3rd harmonic waves, I/sub 1/ and I/sub 3/ and their phase angles /spl theta//sub 1/ and /spl theta//sub 3/, respectively, for the application of a constant voltage. It has been concluded that the length of interconnected channels in the water treed region grows with time after the application of a constant voltage.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125424277","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: 14

Broad band dielectric spectroscopy as a diagnostic technique for water tree growth in cables 宽频带介电光谱作为电缆中水树生长的诊断技术

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.804606

M. Given, M. Judd, S. Macgregor, J. Mackersie, R. Fouracre

引用次数: 4

Dielectric response during curing of a resin-rich insulation system for rotating machines 旋转机械用富树脂绝缘系统固化过程中的介电响应

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.804646

A. Helgeson, U. Gafvert

引用次数: 1

The effect of cleaning and metallisation on high voltage performance of alumina insulators in vacuum 真空中清洗和金属化对氧化铝绝缘子高压性能的影响

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.804677

S. S. Al-Dargazelli, J. Sullivan, A. M. Abbot, W. Taylor

{"title":"The effect of cleaning and metallisation on high voltage performance of alumina insulators in vacuum","authors":"S. S. Al-Dargazelli, J. Sullivan, A. M. Abbot, W. Taylor","doi":"10.1109/CEIDP.1999.804677","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.804677","url":null,"abstract":"Reliable high-voltage performance of ceramic insulators in vacuum is essential to a range of technical applications, such as vacuum tubes, high-energy particle accelerators and fusion reactors. The study of the electrical performance of ceramic insulators in vacuum is one of the vital tools in understanding the flashover phenomenon, which limits the performance of insulators in high-voltage devices. This study is concerned with the high-voltage vacuum electrical breakdown of alumina (Al/sub 2/O/sub 3/) ceramics, measured in terms of I-V characteristics, Fowler-Nordheim plots and spark rates. A systematic study of eight non-metallised (raw and chemically cleaned) and six metallised samples was carried out in electric fields up to 15 MV/m. From the complete performance history of each sample (including electro-optical threshold voltage, maximum leakage current and spark rate) a comprehensive comparison of the electronic behaviour from the ceramics was obtained. Clear distinctions were observed between the characteristics of metallised and non-metallised samples. The distinct behaviours of the two types are discussed in relation to contemporary physical models of the pre-breakdown surface-flashover of the solid insulator in vacuum.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121152739","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

Enhanced compressive creep performance of high voltage insulation 提高高压绝缘的压缩蠕变性能

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.804653

F. Emery

引用次数: 1

Estimate of the electric stress in the liquid lying between particles of an electrorheological fluid 估计电流变流体颗粒之间的液体中的电应力

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.804656

P. Atten, P. Gonon, J. Foulc, C. Boissy

引用次数: 1

Flashover phenomena of polluted insulators energized by AC voltage 交流电压激励下受污染绝缘子的闪络现象

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807895

A. Salam, Hussein Ahmad, A. S. Ahmad, T. Tamsir, M. Piah, Z. Buntat

引用次数: 10

Oil electrification measured on a pressboard coming from a damaged power transformer 在从损坏的电力变压器出来的压板上测量油通电

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807924

E. Moreau, T. Paillat, G. Touchard

{"title":"Oil electrification measured on a pressboard coming from a damaged power transformer","authors":"E. Moreau, T. Paillat, G. Touchard","doi":"10.1109/CEIDP.1999.807924","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.807924","url":null,"abstract":"In high power transformers, pressboard and oil are required for electrical insulation. On the other hand, the oil is also used as a coolant of the system. The flow electrification process occurring at oil-pressboard interface seems to be initiating on electrical discharge incidents. Our recent investigations of electrification generated by an oil flow through different pressboards showed an influence of the pressboard degradation by artificial electrical discharges. Consequently the goal of this experimental study is to measure and to compare the convected space charge density value obtained with a brand new pressboard sample and with a pressboard coming from a damaged power transformer. The influence of an additive (BTA benzotriazol 1-2-3) in oil is also analyzed. The results show that the pressboard sample obtained from the damaged power transformer induces a high increase of flow electrification due to a modification of the exchange process at the pressboard-oil interface. On the other hand, an addition of BTA permits to reduce significantly flow electrification.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"11 Suppl 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133445382","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

Electrical characterization of aramid, organic and inorganic papers and polyester films submitted to AC electrical fields 芳纶，有机和无机纸和聚酯薄膜在交流电场下的电学特性

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807873

F. Odiot, I. Marc, S. Malrieu, A. Toureille, P. Sulot

引用次数: 2

Streamer model based on electronic processes in liquids 基于液体电子过程的流线模型

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807831

R. Badent

引用次数: 4