Conference on Electrical Insulation and Dielectric Phenomena,最新文献_第7页

Evaluation of high temperature capacitor dielectrics 高温电容电介质的评价

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69589

A. Hammoud, I. Myers

引用次数: 13

Impulse breakdown characteristics and cost/benefit analysis of SF/sub 6//CCl/sub 2/F/sub 2//CO/sub 2/ mixtures SF/sub 6//CCl/sub 2/F/sub 2//CO/sub 2/混合料脉冲击穿特性及成本效益分析

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69594

D. Raghavender, M. Naidu

{"title":"Impulse breakdown characteristics and cost/benefit analysis of SF/sub 6//CCl/sub 2/F/sub 2//CO/sub 2/ mixtures","authors":"D. Raghavender, M. Naidu","doi":"10.1109/CEIDP.1989.69594","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69594","url":null,"abstract":"A comprehensive study has been carried out in SF/sub 6//CCl/sub 2/F/sub 2//CO/sub 2/ mixtures to measure 50% breakdown voltages V/sub 50/ using both positive and negative polarity lightning impulse (1.2/50 mu s) voltages under nonuniform fields (5-mm rod, 230-mm plane electrode) over a pressure range of 0.1 to 0.5 MPa for a gap spacing of 20 mm. The sum of SF/sub 6/ and CCl/sub 2/F/sub 2/ concentrations in the mixture was always maintained in the range of 21 to 40%, the rest being CO/sub 2/. Among the different sets of SF/sub 6//CCl/sub 2/F/sub 2//CO/sub 2/ mixtures studied, two ternary mixtures, namely 20% SF/sub 6//20% CCl/sub 2/F/sub 2//60% CO/sub 2/ and 30% SF/sub 6//10% CCl/sub 2/F/sub 2//60% CO/sub 2/, were found superior to SF/sub 6/. From the known gas content in the mixtures and from the measured breakdown voltages, a cost/benefit analysis has been carried out for the various mixtures investigated. A striking feature of this analysis is that the most promising ternary gas mixture, namely 30% SF/sub 6//10% CCl/sub 2/-F/sub 2//60% CO/sub 2/, costs only 33% as much as pure SF/sub 6/, giving 100% to 170% positive breakdown strength, and 90 to 100% negative breakdown strength as compared to that of pure SF/sub 6/.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"9 1","pages":"489-494"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76356532","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

On electric strength of solid insulating materials 论固体绝缘材料的电强度

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69588

E. Husain, M. M. Mohsin, R. Nema

引用次数: 4

Corona stabilization at negative impulse stress in SF/sub 6/ and SF/sub 6/-N/sub 2/-mixtures SF/sub - 6/和SF/sub - 6/-N/sub - 2/-混合物在负脉冲应力下的电晕稳定

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69526

W. Pfeiffer, H. Welke, V. Zimmer

引用次数: 0

Electrical aging of adhesive 胶粘剂电老化

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69541

H. Narushima, Y. Tsukamoto, J. Koshimura

引用次数: 1

Energy criterion as the basis of the 'universal' dielectric response 作为“通用”介电响应基础的能量准则

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69524

A. Jonscher

{"title":"Energy criterion as the basis of the 'universal' dielectric response","authors":"A. Jonscher","doi":"10.1109/CEIDP.1989.69524","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69524","url":null,"abstract":"It is suggested that, in comparison with accepted theories, the energy criterion approach to the understanding of the 'universal' dielectric response offers a significantly better overall insight into the physical and chemical nature of the polarization processes deviating strongly from the classical Debye spectra. The ability to interpret the entire range of dielectric phenomena within a unified body of theory represents one of the chief attractions of the proposed approach, while the prospect of being able to understand the conditions for obtaining the various limiting forms of behavior such as low-frequency dispersion (LFD), 'flat loss', or near-Debye spectra, constitutes a distinctive advance on the current state of dielectric theory, which is not able to offer clear interpretations of the widely observed universal laws. It is noted that there may exist many physical mechanisms capable of satisfying the energy criterion, and the applicability of any one of these has to be judged in light of the nature of the process in question. The author proposes three such mechanisms, one for relatively lossy dipole and hopping charge carrier systems, another for low-loss nonpolymers, and a third for LFD processes in which there is a clear electrochemical connection.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"34 1","pages":"59-64"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85083024","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

Prebreakdown events in DC and AC stressed n-hexane 直流和交流应力正己烷的预击穿事件

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69529

P. McGrath, H. I. Marsden

引用次数: 5

Effects of temperature and moisture on flow electrification in transformer pressboard/oil insulation 温度和湿度对变压器压板/油绝缘流动带电的影响

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69576

A. J. Morin, M. Zahn, J. Melcher

{"title":"Effects of temperature and moisture on flow electrification in transformer pressboard/oil insulation","authors":"A. J. Morin, M. Zahn, J. Melcher","doi":"10.1109/CEIDP.1989.69576","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69576","url":null,"abstract":"A novel Couette charger facility has been built to simulate flow electrification processes in transformers, where transformer oil fills the annulus between coaxial cylindrical electrodes that can be bare metal or transformer pressboard covered. Flow electrification charge density measurements as a function of inner cylinder speed have been performed using a newly developed absolute charge sensor (ACS) which brings a sample of fluid from the turbulent core into a Faraday cage and measures the total charge with no extraneous contributions from charge separated within the ACS itself. Transient measurements with a step change in temperature have shown the charge density to change from an initial to a new steady-state value. These charge density values depend on equilibrium moisture levels which in turn depend on the temperature. For all oils tested thus far with bare metal and T4 pressboard, the oil charge density is positive, but with HiVal pressboard there are some moisture and temperature regimes where the charge polarity reverses. The effects of transformer energization were also simulated by applying low-frequency (1 to 4 Hz) high voltages (field strength up to 1.8 kV/cm peak) across the cylinder of the Couette charger.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"5 1","pages":"384-385"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81429812","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

Surface conductivity of irradiated polymers in humid environment 潮湿环境下辐照聚合物的表面电导率

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69544

D. Das-Gupta, A. Goodings

引用次数: 5

Determination of gases and gas pressure in GIS spacer voids GIS间隔空隙中气体和气体压力的测定

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69531

J. Braun, J. Groeger

引用次数: 20