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

{"title":"A study of water tree frequency dependence and growth rate in polymer","authors":"A. H. Eldin, Z. E. Shazll","doi":"10.1080/00914038508078655","DOIUrl":"https://doi.org/10.1080/00914038508078655","url":null,"abstract":"This paper presents theoretical and experimental studies on the water tree (W.T.) growth rate frequency dependence. The high growth rate experienced is explained on the light of the simulating circuit components and parameters. The results are very sensitive to the assumed water content in tree and the original tree length. Attempts were made to correlate between W.T. theories and experimental results. The mechanisms of W.T. initiation and growth are explained.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"17 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":"125504802","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}

{"title":"Ionic transients in an extended chain aromatic hetero-cyclic polymer","authors":"R. E. Barker, D. Y. Chen, W. Huang","doi":"10.1109/CEIDP.1982.7726519","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726519","url":null,"abstract":"In an effort to better understand the process of charge transport in extended chain aromatic hetero-cyclic polymers we have made detailed studies of d.c. conduction in one such rigid rod polymer, viz. poly(p-phenylene benzobisthiazole) or PPBT *** Two types of transient currents have been measured. One of these is the gradual decay of current over a long period of time in a PPBT sample exposed to a step function voltage. Typically the current I drops by about three orders of magnitude over a period of six hours and, when plotted on a log-log graph, exhibits a series of linear segments I ∝ t−n. Such measurements were made on samples doped with LiCl, NaCl, CaCl2, LaCl3, etc. The other type of transient, measured for the same samples, resulted when the humidity was suddenly increased from dry conditions to some finite value on a specimen in a quasi-steady state of conduction. A large increase of relative current (ΔI/Imin) occurs, followed by a gradual decrease over a long period of time. Efforts to relate these effects to the nature of the conduction mechanisms and diffusion of water are discussed.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"46 38 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":"132417782","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}

{"title":"The effect of charged centers in thermally stimulated currents: Application to poly(N-vinylcarbazole)","authors":"J. Plans, M. Zieliński","doi":"10.1109/CEIDP.1982.7726548","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726548","url":null,"abstract":"In measuring the field dependence of DC conductivity in amorphous dielectrics one often finds, that the logarithm of current plotted vs. square root of electric field yields a straight line. This effect may be due to decrease of occupation probability of a trap, charged when empty, under the influence of the external field. Frenkel and Poole (1) discussed this phenomenon in terms of the Coulomb interactions with the charged center. The electrode injection (Schottky effect (2)) can, however, yield the same type of field dependence, and it is often very difficult to distinguish both phenomena. More recently, the same type of field dependence was found in the time-of-flight measurements of mobility. This effect is now seen to be so widespread that doubts have been raised whether the presence of charged traps in amorphous dielectrics solely accounts for the observed field dependence of various electrical properties in these materials.","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":"132143045","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}

{"title":"The effects of pressure on the ionic conductivity of PEO8-LiClO4","authors":"M. Wintersgill, J. Fontanella, M. Worboys, A. Chadwick, C. Andeen","doi":"10.1109/CEIDP.1982.7726524","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726524","url":null,"abstract":"Ion conducting polymers are currently being considered for use as the solid state electrolyte in batteries. The feasibility of such an application has been shown by several workers [1-5]. They show that conductivities of the order of 10–4/ohm-cm can be obtained. This is sufficient to achieve the desired power densities of about 100 W/l, since polymers can be formed into very thin layers. The purpose of the present work is to report data concerning the effect of pressure on the ionic conductivity of these materials. The results are used to calculate the activation volume for the motion of the ions which yields new information concerning ion transport.","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":"122224133","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}

{"title":"Direct measurement of trapped-charge profiles in irradiated polymer films","authors":"G. Sessler, J. West, R. Gerhard-Multhaupt, H. von Seggern","doi":"10.1109/CEIDP.1982.7726513","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726513","url":null,"abstract":"Polymer films used in the space environment are frequently exposed to partially penetrating electrons and show therefore often long-lasting charge-trapping effects. The physical processes responsible for the charge buildup and decay can only be understood with an accurate knowledge of the spatial charge profiles within the dielectrics. While calculations of charge profiles in radiation-charged dielectrics have been attempted frequently [1-8], experimental data on thin-film polymers used in space applications are scarce [9-12] and sometimes not too reliable.","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":"125094088","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}

{"title":"A transient-state theory of dielectric relaxation and some empirical laws","authors":"T. Guo, Wendy W. Guo","doi":"10.1109/CEIDP.1982.7726509","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726509","url":null,"abstract":"Recently there have been renewed interests in the fundamental theory of transient dielectric responses. It centers on the physical interpretation of the Curie-von Schweidler law for the depolarization current in a dielectric after a constant field is abruptly removed or applied [1]: J(t) = kt⁻ⁿ (ο < n < 1)(1) and on the asympototic frequency_dependence of the dielectric susceptibility, χ ∼ ω, which is derivable from some empirical formulas, in particular, the Cole-Davidson dispersion law [2]; χ(ω) = g<inf>o</inf>/(1−iωτ<inf>o</inf>)^α (0 < α < 1) (2) Even though the above behaviors deviate considerably from Debye's theory of dielectric relaxation, which predicts an expoential decay law for the current, the explanation has always been based on Debye's theory by assuming that a dielectric may contain a distribution of relaxation times (DRT). After an extensive search of dielectric data, Jonscher, Ngai, and White reported that there are some universal dielectric characteristics among a wide range of materials, and that these behaviors are direct results of this universality [3-5]. They also proposed that this universality is the result of some many-body interactions in condensed matter and may be related to the low energy excitation of correlated states. In a recent article Calderwood pointed out the following difficulties in this universality theory [6]: (1) If t⁻ⁿ decay is to be taken strictly as Jonscher has proposed, the decay curve will allow one to determine the past history of the dielectrics. (2) As the t⁻ⁿ decay law is not invariant under the displacement t + t+t<inf>o</inf>, it is possible to excite a polarization current in each of two identical samples, one after another, such that the polarization will be equal at some later time but continue to evolve along two distinct curves, which implies that the polarization alone is not enough to specify the state of the dielectric. Since these difficulties would not exist in an exponential decay law, the DRT explanation was preferred and the t⁻ⁿ decay law should be taken only as an approximation.","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":"116613342","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}

{"title":"Thermal aging of biaxially oriented polypropylene films part II morphology and dielectric properties","authors":"T. Umemura, D. Couderc","doi":"10.1109/CEIDP.1982.7726583","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726583","url":null,"abstract":"Despite many studies carried out on polypropylene (PP) resins, few data concerning the biaxially-oriented (BO) PP film have been reported (1,2). From a practical point of view, it is important to clarify the fundamental properties of such BO-PP films, in view of their increasing use in high voltage apparatus. The authors reported at this conference results concerning the general aspects of the thermal aging of BO-PP films in various atmospheres (air, vacuum, N2, SF6) (2). Thermally aged BO-PP films exhibit an increase of the crystallinity, a new melting peak on DSC fusion curves, and crystal phase reorganization; furthermore, their surfaces are characterized by the appearance of a droplet-like structure in the early stage of thermal aging. Similar trends were observed with films aged in vacuum, N2 and SF6 with, however, a stronger effect of SF6 on the dimensional changes and crystallinity increase of the material. In this report morphological variations and dielectric behavior of BO-PP films aged in SF6 are discussed.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"245 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":"114831194","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}

{"title":"Influence of naturally existing micro particles on AC and impulse breakdown strengths of industrially purified transformer oil","authors":"H. Miyao, K. Endo, M. Higaki, Y. Kamata, Y. Kako","doi":"10.1109/CEIDP.1982.7726568","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726568","url":null,"abstract":"Breakdown strengths of insulating oil are influenced by micro particles in oil and the relationships between the breakdown phenomena of insulating oil and micro particles in oil are reported by many authors. However many of them are the results of experiments, which were carried out by adding micro particles into oil artificially, and some of the results are obtained by filtering oil, but in the experiments the numbers of particles were not investigated quantitatively.[1]","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"3 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":"114884598","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}

{"title":"A new measurement of ionic mobility in insulators by thermally stimulated currents","authors":"F. Kaneko, K. Yamashita, T. Hino","doi":"10.1109/CEIDP.1982.7726547","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726547","url":null,"abstract":"Ionic mobilities in insulators have been derived from transit times observed in polarity reversal measurements [1]. In the derivation, the effects of space charge field and diffusion are neglected. However, mobile ions build up space charge fields in the insulators and distort the inner fields. In the strict sense, not only drift of ions, but also diffusion and space charge field should be regarded in order to express behavior of mobile ions.","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":"121527987","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}

{"title":"An experimental method for the distinction between bulk polarization and surface charging","authors":"H. Kliem, G. Arlt","doi":"10.1109/CEIDP.1982.7726529","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726529","url":null,"abstract":"When a step-like electric field is applied to an insulator between two plane parallel electrodes, the current which flows to the structure after the normal charging is time dependent and can often be described by a power law I(t) t ∼t−α. This relation is called the “Curie-von Schweidler law” it was discovered about 70 years ago. Different interpretations of this law are treated in literature e.g. [1], [2], [3], [4], [5].","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"119 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":"122626395","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}