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

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Observation of charge compensated polarization zones in polyvinylidenefluoride (PVDF) by piezoelectrically generated pressure step wave (PPS) response 利用压电产生的压力阶跃波(PPS)响应观察聚偏氟乙烯(PVDF)中电荷补偿极化区
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.18419/OPUS-4936
W. Eisenmenger, M. Haardt, K. Holdik
{"title":"Observation of charge compensated polarization zones in polyvinylidenefluoride (PVDF) by piezoelectrically generated pressure step wave (PPS) response","authors":"W. Eisenmenger, M. Haardt, K. Holdik","doi":"10.18419/OPUS-4936","DOIUrl":"https://doi.org/10.18419/OPUS-4936","url":null,"abstract":"Recently, measurements of the acoustic step-wave response using piezoelectric pressure or velocity-pulse excitation [1],[2] have been performed with incompletely poled PVDF-samples.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"23 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":"116534219","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: 7
Consideration on a boundary condition for impulse thermal assumption 对脉冲热假设边界条件的考虑
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726563
M. Ieda, M. Hikita, M. Nagao, G. Sawa
{"title":"Consideration on a boundary condition for impulse thermal assumption","authors":"M. Ieda, M. Hikita, M. Nagao, G. Sawa","doi":"10.1109/CEIDP.1982.7726563","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726563","url":null,"abstract":"In general, the equation of thermal breakdown is given as follows: Cv (∂T/∂t) − div (κ grad T) = j F, (1) where Cv is the heat capacity of the material per unit volume, κ the thermal conductivity, j the current density, and F the electric field. Consider the case when the heat conduction from the dielectric surface to the surroundings is ideally complete. Provided the voltage duration to breakdown tB is sufficiently shorter than the thermal time constant of dielectric tth, that is tB << tth (2) the second term of the left-hand side in eq.(1), which is the heat conduction term, can be ignored. In such a case, the impulse thermal assumption can be expected to be valid [1]. However, many reports have been published which insist the impulse thermal mechanism even under the condition tth < tB [2,3,4,5]. It is surprising that this case appears in the breakdown of plasma-polymerized styrene thin films with about 3000Å thickness [5]. These experimental results imply that provided an unsufficient heat conduction from the dielectric material is taken into account, the impulse thermal breakdown form is possibly established even though the condition tB << tth is not fulfilled. In this paper, a quantitative examination on this relationship is made by solving the fundamental equation of thermal breakdown numerically under the boundary condition which obeys Newton's law of cooling for various values of heat transfer coefficient A from the dielectric surface to the ambient. As an example, assuming ionic conduction and varying the ionic conduction parameters, the electric strength is calculated as a function of λ. From these results, the validity of approximation to the impulse thermal assumption is examined quantitatively. λ is also discussed.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"30 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":"127199422","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
Charge transfer phenomena in slighly conducting cyclohexane between electrodes covered with polymer films 微导电环己烷在覆有聚合物薄膜的电极间的电荷转移现象
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726562
A. Saad, R. Tobazéon
{"title":"Charge transfer phenomena in slighly conducting cyclohexane between electrodes covered with polymer films","authors":"A. Saad, R. Tobazéon","doi":"10.1109/CEIDP.1982.7726562","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726562","url":null,"abstract":"In the general study of conduction and low-frequency losses of impregnated semi-crystalline polymers porous media, or more generally for composite insulations two limiting cases can be distinguished. These are when i/ The electric field is parallel to the liquid/solid interface, ii/ The field is perpendicular to the interface.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"1 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":"130619407","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
Propagation of partial discharge pulses in shielded power cable 部分放电脉冲在屏蔽电力电缆中的传播
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726545
G. Stone, S. Boggs
{"title":"Propagation of partial discharge pulses in shielded power cable","authors":"G. Stone, S. Boggs","doi":"10.1109/CEIDP.1982.7726545","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726545","url":null,"abstract":"The design of concentric-neutral plastic-insulated power cables has been optimized for the transmission and distribution of large quantities of 60-Ηz power at high voltages. Understanding the mechanism of high frequency propagation in these cables is important in order to evaluate the sensitivity of partial discharge measurements [1,2]. Partial discharges in the solid insulation generate frequencies ranging to several hundred MHz [3]. With wide band detection, location of discharge sites in cable through pulse propagation timing techniques is also possible [4,5,6].","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"1 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":"130622053","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: 102
Space charges in low density polyethylene 低密度聚乙烯中的空间电荷
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726523
J. S. Duffy, D. Das-Gupta, D. Cooper
{"title":"Space charges in low density polyethylene","authors":"J. S. Duffy, D. Das-Gupta, D. Cooper","doi":"10.1109/CEIDP.1982.7726523","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726523","url":null,"abstract":"It is established that on application of an external electric field a dielectric absorption occurs in polyethylene, resulting in a polarization which persists even after the removal of the polarizing field. This persistent polarization (electret behaviour) in a non-polar semicrystalline polyethylene film may arise from an injection of charge carriers (electrode injection) and their subsequent localization in the polymer. Such charges may also be prevalent in the virgin polyethylene films as impurity ions. Present work investigates the nature of the dielectric polarization as a function of charging fields before and after hexane treatment of low density polyethylene (LDPE) films using a thermal current transient technique. LDPE films of 75 μm thickness were kindly provided by the Monsanto Chemical Company of Great Britain.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"24 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":"130488283","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
Charging and discharging characteristics of a capacitor with a charge injecting electrode 具有充注电极的电容器的充电和放电特性
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726576
M. Zahn, D. B. Fenneman, S. Voldman, T. Takada
{"title":"Charging and discharging characteristics of a capacitor with a charge injecting electrode","authors":"M. Zahn, D. B. Fenneman, S. Voldman, T. Takada","doi":"10.1109/CEIDP.1982.7726576","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726576","url":null,"abstract":"A water/ethylene glycol mixture, to be operated at temperatures below 0°C, is being investigated for use as the high permittivity, low loss dielectric in pulse forming lines for pulsed power applications.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"344 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":"133071125","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
A thermophonic investigation of switching and memory phenomena in thick amorphous chalcogenide films 厚非晶硫化物薄膜中开关和记忆现象的热声学研究
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726531
J. Kotz, M. Shaw
{"title":"A thermophonic investigation of switching and memory phenomena in thick amorphous chalcogenide films","authors":"J. Kotz, M. Shaw","doi":"10.1109/CEIDP.1982.7726531","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726531","url":null,"abstract":"We have employed a thermophonic technique [1] supplemented by numerical analysis in order to study switching and memory effects in the memory-type alloy Ge15 Te18 S2 [2]. The study was initiated because: 1) there was still some doubt as to whether the mechanisms for the initiation of the switching event from a high resistance OFF-state to a low resistance ON-state is predominantly electronic [3-10] or thermal [11-14]; 2) the technique provides a novel way of studying the various phenomena [15] and, for the first time, determining the temperature-time profile during the three phases of the switching cycle.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"21 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":"123963902","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: 6
Kinetics of solidification of cross-linked polyethylene 交联聚乙烯固化动力学
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726546
Y. Kao, H. Tseng, P. Phillips
{"title":"Kinetics of solidification of cross-linked polyethylene","authors":"Y. Kao, H. Tseng, P. Phillips","doi":"10.1109/CEIDP.1982.7726546","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726546","url":null,"abstract":"In the production of extruded dielectric cables the molten polymer is invariably quenched following extrusion. During this process crystallization of the polymer occurs at a series of different temperatures depending on the thermal conductivity of the polymer in question. For cross-linked polyethylene the polymer is chemically cross-linked immediately after extrusion and prior to quenching. Separation of impurity molecules and of low molecular weight polyethylene molecules generally occur during the crystallization process. The rate at which such separation processes occur may have an influence on electric breakdown behavior. When in use the temperature of the cable may exceed the melting point resulting in re-crystallization under totally different thermal conditions from those under which crystallization occurred during manufacture. A different morphological structure may result under such circumstances. In this paper we wish to report studies of the crystallization behavior of chemically cross-linked polyethylene and to discuss the ways in which it differs from the uncross-linked polymer.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"4 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":"116479326","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
High resolution technique for measuring charge and polarization distributions in dielectrics by piezoelectrically induced pressure step waves (PPS) 压电感应压力阶跃波(PPS)测量介质中电荷和极化分布的高分辨率技术
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.18419/OPUS-4935
M. Haardt, W. Eisenmenger
{"title":"High resolution technique for measuring charge and polarization distributions in dielectrics by piezoelectrically induced pressure step waves (PPS)","authors":"M. Haardt, W. Eisenmenger","doi":"10.18419/OPUS-4935","DOIUrl":"https://doi.org/10.18419/OPUS-4935","url":null,"abstract":"In the past, several experimental methods have been developed [1] for the analysis of charge and polarization distributions within dielectrics. The acoustic pressure step method originally proposed by Laurençeau et al. [2] recently could be improved significantly achieving resolutions in the order of a few μm [3, 4]. Instead of using pressure steps generated by a shock tube [2] or pressure pulses originating from short and intense laser excitation [3] our technique for pressure step generation [4] makes use of the transient response of a piezoelectric crystal plate. In the experimental arrangement, c.f. Fig. 1, a 100nsec duration, 400 volt pulse from a 50Ω-cο-axial cable discharge generator is applied to the Schematic representation of the experimental technique. (1) Connection to voltage pulse generator (150psec risetime), (2) Connection to wideband preamplifier and oscilloscope.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"33 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":"124826146","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: 21
Dielectric dispersion in myoglobin solution 肌红蛋白溶液中的介电色散
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982 Pub Date : 1982-10-01 DOI: 10.1109/CEIDP.1982.7726518
S. R. Gough
{"title":"Dielectric dispersion in myoglobin solution","authors":"S. R. Gough","doi":"10.1109/CEIDP.1982.7726518","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726518","url":null,"abstract":"Myoglobin, the red pigment of muscle tissue, exhibits in aqueous solution two major regions of dielectric dispersion [1-3]. Between these a much smaller dispersion has been inferred to exist [3,9]. The three, denoted β,δ,γ, are considered to arise from reorientation of protein, bound water, and solvent water respectively [1]. Herein are described further efforts to characterize the δ dispersion and to choose an appropriate model to represent the experimental results.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"1 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":"128721487","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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