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Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982最新文献

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Dielectric behaviour of liquid natural gas compared to vacuum insulation 液态天然气的介电性能与真空绝缘的比较
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726561
A. Hossam-eldin
{"title":"Dielectric behaviour of liquid natural gas compared to vacuum insulation","authors":"A. Hossam-eldin","doi":"10.1109/CEIDP.1982.7726561","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726561","url":null,"abstract":"This paper prestents investigations into the electrical properties of liquid natural gas(LNG). The electric strength measurements, under alternating- and direct-voltages, showed reasonable values when compared to vacuum and other liquid gases. Partial discharge activity was measured, using a pulse height analyzer, and the behaviour was very satisfactory. The improvements were significant under d-c conditions. The dielectric constant and the loss-factor were measured and showed promising use of LNG as an electrical insulator in cryoequipment. On account of being used as insulator in cryoequipment it can be used as coolant for solid dielectrics. This would be an economical turn over to LNG when compared with liquid helium(LHe).","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126469819","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
Altering the electrical conductivity of dielectrics 改变电介质导电性的
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726536
C. N. Fellas
{"title":"Altering the electrical conductivity of dielectrics","authors":"C. N. Fellas","doi":"10.1109/CEIDP.1982.7726536","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726536","url":null,"abstract":"When a spacecraft is orbiting the earth in a geo-synchronous orbit it is bombarded by a variety of charged particles trapped by the earth's magnetic field. The most troublesome type of radiation is electrons which cause charging of the dielectrics which are used as thermal control surfaces on the outside of the spacecraft. When a dielectric is charged beyond the discharge threshold of the material arcing occurs producing spurious switching of the electronic units aboard the spacecraft. A solution to the problem would be to invent new materials combining good thermal insulation properties and sufficiently high electrical conductivity. Composite materials having these properties have already been designed and tested in various configurations [1]. Another method of producing a material with the required properties is to select a dielectric and alter its bulk electrical conductivity by irradiation with charged particles [2]. This paper describes the principle involved in this method and tests carried out in order to verify it. Electrons of sufficient energy to penetrate a dielectric sheet were used and high flux irradiation of Kapton showed enhancement of its electrical conductivity which remained after the irradiation was stopped.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127925715","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
Multichannel surface discharge switch 多通道表面放电开关
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726581
D. Johnson, M. Kristiansen
{"title":"Multichannel surface discharge switch","authors":"D. Johnson, M. Kristiansen","doi":"10.1109/CEIDP.1982.7726581","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726581","url":null,"abstract":"The performance of a multichannel surface discharge switch has been investigated as a function of the dielectric material. The switch operates at 45 kV and transfers 180 joules per shot at a rate of 1.2 pps in ambient air. Dielectrics presently under investigation include Delrin, Blue Nylon, Kapton, Lucite, G-10, Macor ceramic, and two forms of boron nitride. The dielectrics are compared by observing their erosion, changes in breakdown voltage, and the number of channels per meter during discharges. The surfaces of three of the dielectrics exposed to 10,000 shots have been studied using ESCA.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133933234","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
Insulating materials for high voltage machines for atomic power plants 原子能发电厂高压机器用绝缘材料
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726540
B. G. Sharxna
{"title":"Insulating materials for high voltage machines for atomic power plants","authors":"B. G. Sharxna","doi":"10.1109/CEIDP.1982.7726540","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726540","url":null,"abstract":"The paper deals with estimating the effect of radiation oil electrical insulating materials. In atomic power plants such materials are exposed to different intensities of radiation depending upon their use in the type of electrical equipment. In a first approach different types of thermoplastics and thermosetting resin materials were exposed to gamma radiations. The effects observed and probable reasons are discussed. Subsequently full coils were exposed to radiation with a dosage equivalent to the minimum service life required in the electrical machines. Since such machines cannot be assessed while in continuous service, because of radiation conditions (except while the plant is shut down for periodic maintenance), a high level of confidence in materials used is required. Descriptions of studies conducted and conclusions are summarised in the paper.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114720175","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
Ramp test technique for D.C. partial discharge 直流局部放电的斜坡试验技术
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726572
R. Bever, J. Westrom
{"title":"Ramp test technique for D.C. partial discharge","authors":"R. Bever, J. Westrom","doi":"10.1109/CEIDP.1982.7726572","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726572","url":null,"abstract":"There is a relatively little published work [1,2,3,4] on dc partial discharge (P.D.) measurements on practical insulation systems. Compared to the much used technique of ac testing, the number of P.D. pulses are very few, even considerably above inception voltage. The dc inception voltage itself is difficult to determine, consisting of only a very few pulses/minute, and it will only be correct for a fresh, completely discharged dielectric specimen, into which space charge has not yet been injected. For dc partial discharge the quantity φ/ε is the cogent material property factor where φ is the conductivity and ε is the permittivity of the dielectric containing the voids or grain boundaries. This factor represents the inverse of the time constant for charge distribution due to dielectric conductivity [3].","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114864488","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
Impulse and power frequency electrical breakdown of silicone oil 硅油的脉冲和工频电击穿
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726569
J. Crine, R. Olivier
{"title":"Impulse and power frequency electrical breakdown of silicone oil","authors":"J. Crine, R. Olivier","doi":"10.1109/CEIDP.1982.7726569","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726569","url":null,"abstract":"Both dielectrically and thermally, silicone oils have outstanding performance capabilities for use in transformers [1,2]. Their dielectric strength has already been shown to vary with volume [1], water [1,3-5] and gas content [1]. Impulse tests indicate a polarity effect [1,6] and insensitivity to viscosity [1,6], contrary to AC tests [1]. The exact breakdown mechanisms are still unclear. This paper presents detailed results of a study on the influence of moisture and gap length, and on the formation of a solid bridge between the electrodes in AC experiments. Comments are made on the validity or significance of the ASTM D 3300 test.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126227916","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
Partial discharges in polymer insulation 聚合物绝缘中的局部放电
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726577
J. Laghari, W. Sarjeant, R. Gupta, K. J. Bickford, T. Springer
{"title":"Partial discharges in polymer insulation","authors":"J. Laghari, W. Sarjeant, R. Gupta, K. J. Bickford, T. Springer","doi":"10.1109/CEIDP.1982.7726577","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726577","url":null,"abstract":"Evolving power conditioning system requirements in many technological areas will place severe demands upon long-lived, repetitive, pulse-power components. A major pacing system component in this high reliability, repetitive pulse-power technology is the energy storage capacitor [1]. Recently, increasing availabilities of quality plastic films, especially polypropylene, and the discovery of the excellent properties of perfluorocarbon liquids for impregnation fluids, make spirally-wound, plastic film/liquid impregnated capacitors a leading candidate for high energy density, repetitively operated, pulse discharge energy storage devices. The dominant lifetime-limiting mechanism in this type of high energy density capacitor is a direct result of partial discharge activity at the buried foil edges, where the electric field is maximum. Objectives of ongoing research programs include the characterization and understanding of the mechanisms of this and related partial discharge phenomena.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124726845","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
Particle- and oil motion close to electrode surfaces 靠近电极表面的颗粒和油的运动
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726570
U. Gafvert
{"title":"Particle- and oil motion close to electrode surfaces","authors":"U. Gafvert","doi":"10.1109/CEIDP.1982.7726570","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726570","url":null,"abstract":"Particle- and oil motion has been studied both in a bare metal gap and with electrodes covered with epoxy. Oil motion, probably due to ion injection from the electrodes, was observed at an AC field strength from 3 kv/mm with bare metal electrodes and from 6 kV/mm with epoxy covered electrodes. The presence of metallic particles strongly enhanced the turbulence of the oil.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126514711","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
Cavitation dynamics of a local discharge in dielectric liquids 介电液体局部放电的空化动力学
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726565
W. Mak, W. G. Chadband, P. Watson
{"title":"Cavitation dynamics of a local discharge in dielectric liquids","authors":"W. Mak, W. G. Chadband, P. Watson","doi":"10.1109/CEIDP.1982.7726565","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726565","url":null,"abstract":"The sequence of events following a localized electrical discharge in a dielectric liquid can be studied using a triggered spark gap in conjunction with a shadowgraph optical arrangement [1]. It has previously been shown that the events which are observed can be explained in terms of the expansion and contraction of a vapour bubble, and that the goemetry of the bubble is approximately hemispherical[2]. This considerably simplifies the description of the process mathematically.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129566212","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
Use of PVDF film in high energy density capacitors PVDF薄膜在高能量密度电容器中的应用
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726578
A. Ramrus, W. White, E. Brown, K. Haskell
{"title":"Use of PVDF film in high energy density capacitors","authors":"A. Ramrus, W. White, E. Brown, K. Haskell","doi":"10.1109/CEIDP.1982.7726578","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726578","url":null,"abstract":"Insulating films with high relative dielectric constants are used in capacitors when the requirements call for high energy density. Polyvinylidene Fluoride (PVDF) film is of interest in these applications because its dielectric constant is about 10 compared to usual values of 2 to 4. This paper is a summary of Maxwell's recent experience with this film. In part, this experience results from the development of capacitors which are used in pulsed plasma thrusters. Those capacitor specifications are shown in Table 1. Due to the long life requirements, life predictions are made from accelerated tests. On this basis, the recent data indicates that Maxwell has refined its manufacturing procedures to the point where the life and voltage specifications can be met. In addition to the life requirement, these spacecraft capacitors must be radiation resistant. To accomplish this, the capacitors must be paper-free because paper is known to be vulnerable to ionizing radiation.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"190 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134193805","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
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