2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132)最新文献

Mode of free-conducting particle motion and particle-triggered breakdown mechanism in non-uniform field gaps 非均匀场隙中自由传导粒子运动模式及粒子触发击穿机制

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Pub Date : 2000-12-01 DOI: 10.1109/CEIDP.2000.885307

K. Sakai, D. Abella, J. Suehiro, N. Hayashi, M. Hara

引用次数: 8

Effects of byproducts of crosslinking agent on space charge formation in polyethylene-comparison between acetophenone and /spl alpha/-methylstyrene 交联剂副产物对聚乙烯空间电荷形成的影响——苯乙酮与/spl α /-甲基苯乙烯的比较

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Pub Date : 2000-12-01 DOI: 10.1109/CEIDP.2000.884016

Y. Ohki, N. Hirai, K. Kobayashi, R. Minami, M. Okashita, T. Maeno

引用次数: 22

A novel on-line method and equipment to detect local problems in turbine generators 一种新的汽轮发电机局部故障在线检测方法及设备

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Pub Date : 2000-10-15 DOI: 10.1109/CEIDP.2000.884020

T. Sorita, K. Enmanji, K. Kato, M. Takashima, K. Nakamura

引用次数: 4

A simulation model for PD patterns in voids with consideration of PD discharge areas 考虑放电面积的空腔放电模式模拟模型

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Pub Date : 2000-10-15 DOI: 10.1109/CEIDP.2000.884042

K. Wu, T. Okamoto, Y. Suzuoki

{"title":"A simulation model for PD patterns in voids with consideration of PD discharge areas","authors":"K. Wu, T. Okamoto, Y. Suzuoki","doi":"10.1109/CEIDP.2000.884042","DOIUrl":"https://doi.org/10.1109/CEIDP.2000.884042","url":null,"abstract":"Based on the concept of the variable discharge areas of partial discharges (PDs), a numerical calculation method was put forward to simulate the PD pattern. In addition the critical field for PD occurrence and the residual field, a new parameter E/sub s/ is introduced in this model to determine the discharge area. The probability for discharge propagation along the surface is assumed to be determined by the field distribution on the surface. The discharge propagation is terminated when the field in the perimeter segments of the PD paths on the surface becomes less than E/sub s/. By increasing E/sub s/ transition to swarming pulsive microdischarges (SPMD) is obtained. The rabbit-like PD pattern can be simulated if assuming surface conductivity of the void. Unlike the conventional simulation models that attribute the different PD behavior to the different probability for PD occurrence, this model might provide a new approach to connect the PD behavior with the surface condition of the insulating materials (e.g. the surface conductivity, the property for discharge propagation on the surface etc.).","PeriodicalId":414762,"journal":{"name":"2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126162725","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: 9

Electrostatic field and potential distribution along gradient systems for high voltage machines 高压机械沿梯度系统的静电场和电位分布

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Pub Date : 2000-10-15 DOI: 10.1109/CEIDP.2000.884008

H. El-kishky, W. Hoover, B. Nindra

引用次数: 7

The lev-vection particle concentrator: some operational characteristics 左旋颗粒浓缩器的一些操作特点

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Pub Date : 2000-10-15 DOI: 10.1109/CEIDP.2000.884067

W. Arnold, B. Chapman

引用次数: 4

A new model for water tree propagation 一种新的水树繁殖模型

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Pub Date : 2000-10-15 DOI: 10.1109/CEIDP.2000.885294

J. Jow, L. Dissado

{"title":"A new model for water tree propagation","authors":"J. Jow, L. Dissado","doi":"10.1109/CEIDP.2000.885294","DOIUrl":"https://doi.org/10.1109/CEIDP.2000.885294","url":null,"abstract":"A quantitative, physical model for water tree formation based on Zeller's concept is presented. The water tree is assumed to be composed of cavities filled with aqueous salts connected by narrow cylindrical conducting links. This structure is formed in the amorphous region of a polymer. The difference in conductivity between the links and cavities and the un-treed polymer, introduces an electrical contribution to the free energy difference between these two regions under an ac electric field. Consequently, there is a pressure difference that acts to force aqueous sails into the un-treed polymer and to establish, first, a conducting link capable of transporting the salt under pressure, and second, a new cavity when the pressure builds up suitably at the end of the link. At all times the pressure gradient is directed away from the pre-existing tree structure. Our model suggests that there is no need to deform the polymer to form the link, and that the pressure difference is sufficient to force enough aqueous salts into the free volume to form a percolation system along the link cylinder. Expressions have been derived for the time required to form a link or a cavity in terms of the flow rate of aqueous salt into and through the link. This physically based model is suitable for computer simulation by defining a matrix of incipient links with nodes acting as incipient.","PeriodicalId":414762,"journal":{"name":"2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129883509","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

Space charge and steady state current in LDPE samples containing a permittivity/conductivity gradient 含有介电常数/电导率梯度的LDPE样品中的空间电荷和稳态电流

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Pub Date : 2000-10-15 DOI: 10.1109/CEIDP.2000.885305

J. Holbøll, K. Bambery, R. J. Fleming

{"title":"Space charge and steady state current in LDPE samples containing a permittivity/conductivity gradient","authors":"J. Holbøll, K. Bambery, R. J. Fleming","doi":"10.1109/CEIDP.2000.885305","DOIUrl":"https://doi.org/10.1109/CEIDP.2000.885305","url":null,"abstract":"Electromagnetic theory predicts that a dielectric sample in which a steady DC current of density /spl epsiv/ is flowing, and in which the ratio of permittivity /spl epsiv/ to conductivity /spl sigma/ varies with position, will acquire a space charge density j/spl middot/grad(/spl epsiv///spl sigma/). A simple and convenient way to generate an /spl epsiv///spl sigma/ gradient in a homogeneous sample is to establish a temperature gradient across it. The resulting spatial variation in /spl epsiv/ is usually small in polymeric insulators, but the variation in /spl sigma/ can be appreciable. Laser induced pressure pulse (LIPP) measurements were made on 1.5 mm thick plaques of ultra pure LDPE equipped with vacuum-evaporated aluminium electrodes. Temperature differences up to 27/spl deg/C were maintained across the samples, which were subjected to DC fields up to 20 kV/mm. Current density was measured as a function of temperature and field. Negligible thermally generated space charge was observed. The charge carrier mobility in the bulk of the samples was estimated to be of order 10/sup -8/ cm/sup 2/ V/sup -1/ s/sup -1/.","PeriodicalId":414762,"journal":{"name":"2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121418460","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

Mechanisms for reduction of impulse strength resulting from small water trees 小水树产生的冲力降低机制

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Pub Date : 2000-10-15 DOI: 10.1109/CEIDP.2000.884019

S. Boggs

引用次数: 3

Intrinsic hydrophobic epoxies for outdoor insulation

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Pub Date : 2000-10-15 DOI: 10.1109/CEIDP.2000.885270

J. Rocks, U. Kaltenborn, T. Hucke

引用次数: 3