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Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986最新文献

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Statistics of prebreakdown current pulses in n-Hexane 正己烷中预击穿电流脉冲的统计
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726457
A. Wintenberg, M. Pace, T. V. Blalock, J. Foust
{"title":"Statistics of prebreakdown current pulses in n-Hexane","authors":"A. Wintenberg, M. Pace, T. V. Blalock, J. Foust","doi":"10.1109/CEIDP.1986.7726457","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726457","url":null,"abstract":"In a stressed liquid dielectric there are electrical, optical, acoustical, mechanical, and chemical processes. As conditions approach those which favor complete electrical breakdown, instabilities are assumed to develop and grow to some ‘point of no return’, which may be the key to understanding breakdown for the purpose of inhibiting it. The events occurring before breakdown have often been considered as “noise”, but almost certainly contain useful information. In these studies, prebreakdown events are observed with state-of-the-art, low-noise electronics and high-speed digital equipment, and are analyzed with mathematical techniques for random processes to reveal the conditions for and mechanisms of the instability inception.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124379711","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: 8
Electrification by liquid dielectric flow 液体介电流致电
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726445
S. M. Gasworth
{"title":"Electrification by liquid dielectric flow","authors":"S. M. Gasworth","doi":"10.1109/CEIDP.1986.7726445","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726445","url":null,"abstract":"For lack of basic information and engineering guidelines, common practice in the design and operation of liquid-cooled power distribution equipment allows for applied electrical potentials, but not for those generated inadvertently by the flow of the semi-insulating coolant. The electric field generation initiated by the turbulent flow of semi-insulating liquids through insulating tubes is the subject of a recent study [1] because of its practical importance where the coolant must be conveyed between metallic elements constrained to different potentials. A limiting case from that study is summarized here to illustrate how to integrate into a self-consistent model the four basic processes of electrification: charge generation, transport, accumulation and leakage.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114434167","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: 8
Electro-optic field measurement at a needle tip and streamer initiation in nitrobenezene 针尖的电光场测量和硝基苯中飘带的起始
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726454
E. Kelley, R. Hebner
{"title":"Electro-optic field measurement at a needle tip and streamer initiation in nitrobenezene","authors":"E. Kelley, R. Hebner","doi":"10.1109/CEIDP.1986.7726454","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726454","url":null,"abstract":"In consideration of initiation of prebreakdown phenomena in liquids one assumes that charge injection processes heat and vaporize the liquid giving rise to an ionized gas or plasma phase. The plasma then acts like a conductor and a process continues whereby the streamer grows across the gap. This paper serves to support this initiation picture in that it provides an estimate of the electric field, amount of injected charge, and joule heating in the vicinity of a needle tip which is the cathode in a needle-sphere electrode geometry. Kerr-effect electro-optical observations of the impulse field in the vicinity of the tip show a distortion from the geometrical field due to charge injection from the tip prior to any streamer development. The injected charge is not distributed evenly over the surface of the tip, but appears to reside mainly in a relatively narrow channel. Estimates reveal that the injected charge densities are on the order of 100 μC/cm3. The streamer initiates where this charge-injection channel touches the needle tip.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"2000 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125728169","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: 8
Thermally stimulated discharge current spectra from electrically stressed high voltage power cables 高压电缆的热激放电电流谱
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726423
K. Doughty, D. Das-Gupta, D. Cooper
{"title":"Thermally stimulated discharge current spectra from electrically stressed high voltage power cables","authors":"K. Doughty, D. Das-Gupta, D. Cooper","doi":"10.1109/CEIDP.1986.7726423","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726423","url":null,"abstract":"Cross-linked polyethylene is employed as the primary insulation in high voltage power transmission cables although its performance is known to deteriorate after a number of years in service. The origin of this ageing effect has been the subject of intense research interest and still remains largely unknown.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129583549","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
Factors influencing the performance of polymeric insulating materials in contaminated environments 污染环境下影响高分子绝缘材料性能的因素
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726465
R. Gorur, E. Cherney, R. Hackam
{"title":"Factors influencing the performance of polymeric insulating materials in contaminated environments","authors":"R. Gorur, E. Cherney, R. Hackam","doi":"10.1109/CEIDP.1986.7726465","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726465","url":null,"abstract":"The successful application of polymeric materials for outdoor insulation depends primarily on the capability of materials to suppress surface leakage current leading to dry band arcing which causes tracking or erosion. The widely used materials, namely, silicone rubber, ethylene propylene diene monomer (EPDM) rubber and epoxy resins are all hydrophobic initially thus suppressing leakage current, but only silicone rubber has shown the capacity to maintain its hydrophobicity for prolonged periods despite the accumulation of surface contamination. Although the EPDM and epoxy materials when filled with substantial inorganic fillers (> 40% by weight), have performed well in laboratory aging tests [1], their performance in the field has not been as good as that of silicone rubber and the reasons for this are not fully understood.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122159026","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
Swarm parameters along gas-solid dielectric interfaces 沿气固介质界面的群参数
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726500
S. Mahajan, T. Sudarshan, R. Dougal
{"title":"Swarm parameters along gas-solid dielectric interfaces","authors":"S. Mahajan, T. Sudarshan, R. Dougal","doi":"10.1109/CEIDP.1986.7726500","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726500","url":null,"abstract":"In order to understand the surface flashover mechanisms in a spacer-bridged, compressed-gas-insulated system, it is essential to have a detailed knowledge of the associated physical parameters, these being dominantly the first Townsend ionization coefficient (α) and the electron drift velocity (Ve). As the addition of a solid spacer to a compressed gas insulated system inevitably reduces the breakdown strength it is important to know how α and Ve are modified or if these are modified at all. These parameters can be determinated through the measurement of electron avalanches using the pulsed Townsend technique [1,2]. Jaksts and Cross attempted such measurements, however, the relatively long pulse width (∼10ns) of the laser used for photo-initiation of the electron avalanche and the poor bandwidth of the electron current amplifier, coupled with noise from the laser, prevented accurate measurements [3].","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126043768","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
Electrode effects from Kerr effect measurements 克尔效应测量的电极效应
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726453
W. Stanaland
{"title":"Electrode effects from Kerr effect measurements","authors":"W. Stanaland","doi":"10.1109/CEIDP.1986.7726453","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726453","url":null,"abstract":"Previous papers {1,3} have shown good agreement between terminal current waveform measurements and current density waveforms from drift theory solutions. These measurements utilize parallel plate (stainless steel) electrodes (with spacing ℓ = .34 cm) immersed in nitrobenzene (with permittivity ε), and variable frequency with a peak voltage V0. This paper shows, by using Kerr effect measurements and drift theory solutions, that terminal current waveforms may provide good fits to current density waveforms while the electric field and charge density distributions between electrodes are distorted by charges at the electrodes which are unexplained by the theory.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"2008 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125620726","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
Time domain dielectric spectroscopy as a tool to study phase nucleation processes 时域介电光谱作为研究相成核过程的工具
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726483
R. E. Barker, K. Campbell, C. C. Huang, C. D. Ross
{"title":"Time domain dielectric spectroscopy as a tool to study phase nucleation processes","authors":"R. E. Barker, K. Campbell, C. C. Huang, C. D. Ross","doi":"10.1109/CEIDP.1986.7726483","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726483","url":null,"abstract":"Conventional (frequency domain) dielectric spectroscopy (FDDS) is very useful for studying molecular interactions in systems which are in equilibrium. However, it is not usually convenient, or in some cases feasible, to investigate transient processes by FDDS. A major advantage of time domain dielectric spectroscopy (TDDS) is that many types of transient phenomena can be studied. As a point in question, the use of TDDS for the investigation of the kinetic processes associated with the nucleation and growth of a second phase in an initial phase will be discussed. The use of the technique for the study of phase separation in polymer blends will also be discussed and preliminary results for a model system, phenol-water, will be presented.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127616344","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
Breakdown properties of razor blade-plane electrodes 刀片平面电极的击穿特性
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726496
S. Fujimori, M. Darveniza
{"title":"Breakdown properties of razor blade-plane electrodes","authors":"S. Fujimori, M. Darveniza","doi":"10.1109/CEIDP.1986.7726496","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726496","url":null,"abstract":"The breakdown characteristics of air have been reported for many kinds of electrode systems, and moreover many aspects of discharge have been examined by computer simulation with Boltzmann equation or by a geometrical analysis of breakdowns with fractal dimension [1]. The aim to study discharge phenomena is to protect the materials suffering discharge and to use the phenomena constructively.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123127441","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
Corona and electrocorrosion of the stator windings of HV machines and on-site test of the corona inception voltage at the plateau 高压电机定子绕组的电晕和电腐蚀，高原电晕起始电压的现场测试
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726488
Lu Pei-Zeng
{"title":"Corona and electrocorrosion of the stator windings of HV machines and on-site test of the corona inception voltage at the plateau","authors":"Lu Pei-Zeng","doi":"10.1109/CEIDP.1986.7726488","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726488","url":null,"abstract":"This paper investigates epoxy-insulated high voltage machines, which utilize corona protection techniques. An attempt was made using a multiple regression analysis to derive the governing equation of corona inception voltage obtained from in-situ tests. The influence of environmental factors is also discussed.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"59 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129542644","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
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