2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena最新文献

The effect of temperature and the mutual influence between two cavities of on the appearance of partial discharges in gaseous cavities contained in the insulator of high voltage 研究了高压绝缘子内气体腔中温度及两腔间的相互影响对局部放电现象的影响

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2004-07-05 DOI: 10.1109/CEIDP.2003.1254918

T. Seghir, D. Mahi, A. Nouar, K. Lefkaier

{"title":"The effect of temperature and the mutual influence between two cavities of on the appearance of partial discharges in gaseous cavities contained in the insulator of high voltage","authors":"T. Seghir, D. Mahi, A. Nouar, K. Lefkaier","doi":"10.1109/CEIDP.2003.1254918","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254918","url":null,"abstract":"Our work treat the effect of the temperature on the appearance of partial discharges in high voltage cables. We modelize the heterogeneous insulator of the cable using finite difference method. The numerical treatment is carried out in bidimensional due to the observed symmetry in the cavities. We simulate regions of weak concentration to an insulator containing one cavity, this is justified by the absence of interactions between cavities. The regions of great concentrations are simulated to an insulator, which contain two cavities in mutual interactions. Once the two cavities are in contact, we speak then of a complex defect called \"bi-vacuole\". The physical proprieties two simulate are the electrical field and the temperature. We present the results of computation obtained by an established program, this result show that the partial discharge is occurred in cavities of small diameters in regions either near the core or the wrapping. The mutual interaction between cavities contributes much the apparition of the partial discharges.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128338470","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

Surface change of polyamide nanocomposite caused by partial discharges 局部放电引起的聚酰胺纳米复合材料表面变化

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-11-21 DOI: 10.1109/CEIDP.2003.1254798

Masahiro Kozako, N. Fuse, K. Shibata, N. Hirai, Yoshimichi Ohki, Tatsuki Okamoto, Toshikatsu Tanaka

引用次数: 54

Surface finish effects on partial discharge with embedded electrodes 埋入电极局部放电时表面光洁度的影响

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-11-21 DOI: 10.1109/CEIDP.2003.1254915

A. Wilder, R. Hebner, Yicheng Wang

引用次数: 2

Breakdown strength at the interface between epoxy resin and silicone rubber 环氧树脂与硅橡胶界面处的击穿强度

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-11-21 DOI: 10.1109/CEIDP.2003.1254850

K. Shibata, Y. Ohki, T. Takahashi, T. Okamoto

引用次数: 4

Roles of cumyl alcohol and crosslinked structure in homo-charge trapping in crosslinked polyethylene 三醇和交联结构在交联聚乙烯中同电荷捕获中的作用

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-11-21 DOI: 10.1109/CEIDP.2003.1254831

N. Hirai, Y. Maeno, T. Tanaka, Y. Ohki, M. Okashita, T. Maeno

{"title":"Roles of cumyl alcohol and crosslinked structure in homo-charge trapping in crosslinked polyethylene","authors":"N. Hirai, Y. Maeno, T. Tanaka, Y. Ohki, M. Okashita, T. Maeno","doi":"10.1109/CEIDP.2003.1254831","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254831","url":null,"abstract":"Space charge is formed in cables insulated with crosslinked polyethylene. It has not been clear whether the crosslinking byproducts or the crosslinked polymer morphology is responsible for the space charge formation. In order to clarify this point, additive-free low-density polyethylene, crosslinked polyethylene, and degassed crosslinked polyethylene were soaked in cumyl alcohol arid the space charge distribution was measured under dc voltage application. Specimens tested are divided into two categories. The first category is a soaked single-layered sheet and the second category, is a two-layered specimen consisting of a soaked sheet and a non-soaked sheet. As a result, the following conclusions were obtained. (1) The crosslinked structure has no effect on homo-charge layers. (2) Cumyl alcohol is responsible for traps in both cases of low-density and crosslinked polyethylene. Due to these traps, a homo-charge layer appears in front of each electrode in the single-layered sheet or on the surface of the soaked sheet facing the opposite electrode in the two-layered sample. (3) More space charge is trapped in crosslinked polyethylene than low-density polyethylene, probably because of the presence of carbonyl groups.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131357442","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: 11

Phenomenology of conduction and breakdown in transformer oil 变压器油导电与击穿现象

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-11-21 DOI: 10.1109/CEIDP.2003.1254853

M. Butcher, M. Cevallos, M. Haustein, A. Neuber, J. Dickens, H. Krompholz

{"title":"Phenomenology of conduction and breakdown in transformer oil","authors":"M. Butcher, M. Cevallos, M. Haustein, A. Neuber, J. Dickens, H. Krompholz","doi":"10.1109/CEIDP.2003.1254853","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254853","url":null,"abstract":"In a coaxial test apparatus enabling the measurement of voltage and current at the test gap, dc conduction and breakdown in transformer oil caused by the application of dc voltages are investigated. Current measurements cover the range from 10/sup -1/ A to 1 kA, with temporal resolutions of milliseconds at the lowest current amplitudes to sub-nanoseconds for currents larger than 10/sup -4/ A. The dc current/voltage characteristic for sub-breakdown voltage amplitudes point to the injection of charge carriers, allow us to characterize the transport mechanisms, and the influence of space charges. For voltages approaching breakdown thresholds, quasi dc-currents rising from nanoamperes to microamperes are superimposed by current pulses with amplitudes of milliamperes and above, and durations of nanoseconds. The onset of these current pulses occurs up to 10 /spl mu/s before breakdown. One of these current pulses reaches a critical amplitude causing voltage breakdown and current rise to the impedance-limited value within 2 ns. Additional optical diagnostics using photomultipliers and high-speed photography with gated microchannel plates yield information on hydrodynamic processes and charge carrier amplification mechanisms associated with the current pulses and final breakdown, such as bubble formation, as well as on the development of the spark plasma finally bridging the gap.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132636925","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

Use of surface resistance for assessing vulnerability of HV outdoor insulators to contamination flashover 用表面电阻评估高压室外绝缘子对污闪的易损性

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254879

R. Gorur, K. Subramanian

引用次数: 8

Surface discharge phenomena of silicon in atmospheric air 大气中硅的表面放电现象

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254861

Guanjun Zhang, Wenxing Zhao, Yan Sun, Zhang Yan

引用次数: 4

A novel approach for classifying the intensity of audible discharge noise caused by contaminated insulator strings 污秽绝缘子串可听放电噪声强度分类的新方法

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254876

T. Matsumoto, K. Yamamoto

引用次数: 0

The study of tree-inception and growth in PMMA in visible and IR spectra 聚甲基丙烯酸甲酯在可见光和红外光谱中的起始树和生长研究

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254938

O. S. Gefle, E. Gockenbach

引用次数: 1