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

{"title":"Electrical conductivity and discharge propagation in spacecraft thermal control dielectrics","authors":"B. Passenheim, V. A. van Lint, J. D. Riddell, R. Kitterer","doi":"10.1109/CEIDP.1982.7726533","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726533","url":null,"abstract":"The electrostatic potentials and fields in thermal control dielectrics attained by various portions of spacecraft bathed in space radiation and solar UV are thought to determine whether electrical discharges are possible, and the precharge enhancement of system generated electromagnetic pulse (SGEMP). The conditions required to initiate a discharge and the characteristics of those discharges serve to validate existing models or provide direction for future models. The conductivity of spacecraft materials in space-like conditions is an important parameter which determines the fields.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"5 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":"114295650","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":"Thresholds for initiation of a power law current response to ramped high voltage in silicone oil","authors":"S. Esendal, A. Watson","doi":"10.1109/CEIDP.1982.7726567","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726567","url":null,"abstract":"A technique has been developed in recent years with which accurately reproducible current characteristics are obtainable in silicone oil as a function of voltage when this is raised and lowered steadily at a uniform ramp rate [l]. Analysis of the data has revealed that the average of the recorded current response to the rising and falling voltage will display on a log-log scale two linear portions which are sharply divided [2J. This current response occurs in the high field regime indicating that it obeys power laws of the form I = ΚvSu, 1 in each sub-regime where the log-log slopes are su and s1 for the upper and lower of these respectively. It is the purpose here to report the results of an investigation into the influence upon this current response of the application of voltage with a variable ramp rate. This has been carried out with hemispherically tipped copper electrodes over the gap range from 1.55–6.20mm and dimethyl siloxane fluids (Dow Corning 200) of viscosities 5, 350 and 1000 c.s. The experiments moreover were repeated with a thin (25 micron) film of untreated polypropylene (075 gauge, Hercules EK 500) extended across the cathode and in contact with it. Voltage ramp rates employed in the investigation ranged from 3.0 to 7.0 kV. S−1 up to 70 kV. As in all previous investigations of this kind, the current response displayed directly as a V-I tracing on an X-Y recorder apparently showed hysteresis which has been attributed to the fact that the rising part of the characteristic is due to the sum of the current response and the displacement current while on the falling part this is much reduced because of the reversal of the ramp rate (Fig.1). Thus the strictly voltage sensitive response has been obtained simply by obtaining the mean value Im of the two observed current readings at each value of applied voltage. The part of the current which is sensitive to the sign of the ramp rate can similarly be obtained by deriving from the V-I characteristic one half of the difference between the current recorded when V is rising and falling. These two currents will be referred to as the mean and differential currents Im and Id to be precise with the nomenclature.","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":"114629061","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":"Dielectric properties of cross-linking polyelectrolyte (ion-exchange membrane)","authors":"R. Dabek","doi":"10.1109/CEIDP.1982.7726532","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726532","url":null,"abstract":"Grain ion-exchangers, as well as ion exchange — membranes are known as crosslinked polyelectrolytes. Ion exchange membranes have been recently used as selective separators in stacks of electrodialisiss and as solid electrolytes in membrane fuel cells. Few years ago, the ion exchange membranes were used in the electrochemical converter and as model substances in biophysics. Now, the mechanism of injection and colletion of ions in dielectric liquids using either ion-exchange membranes is being studied. Controlled injection and collection processes are needed in the field of fundamental research on liquid dielectrics (conduction breakdown, electrohydrodynamics), electrooptics and liquid crystals, as well as in the field of electronic or electric engineering. Ion-exchange membranes are used as ion-collectors or as injectors.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"57 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":"133154338","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":"Electronic charge transfer at metal-biopolymer interfaces","authors":"C. Barnes, P. Bowen, T. Lewis","doi":"10.1109/CEIDP.1982.7726517","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726517","url":null,"abstract":"An understanding of the nature of the contact between metals and biological materials is important for several reasons. Firstly, without a knowledge of possible charge transfer at the contact, it is never certain that intrinsic electrical properties can be determined. Secondly, in the medical field, charge transfer between a living system and the surface of a prosthetic device may be important in determining compatibility. Lastly, since there are many similarities between synthetic and bio-polymers and since charge transfer between metals and synthetic polymers are readily interpreted in terms of electron tunnelling between metal states and relaxed molecular states of the polymers, it is important for biology to confirm that similar electron tunnelling processes can occur in the latter case. Electron tunnelling is believed to be a major biological process [1,2].","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"28 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":"116117330","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":"Insulator charging phenomena in air under non-uniform fields with DC voltages","authors":"V. N. Mailer, K. Srivastava","doi":"10.1109/CEIDP.1982.7726560","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726560","url":null,"abstract":"A considerable amount of research work has been reported on charging phenomena of insulating surfaces. Most of these studies have been confined to either contact electrification of insulating surfaces and charge decay from insulating films [1], or corona behaviour of insulating materials [2]. All these studies seem to indicate that charging of insulating surfaces under dc voltages can pose a serious threat to the performance of insulators; but the phenomena is far from clear, especially in non-uniform fields under surface and space charge conditions. The authors have, therefore, made an attempt to study the charging phenomena and its effect on corona inception characteristics in hemispherically capped rod-to-plane air/insulator gaps using dc voltages.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"25 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":"129693877","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":"Variation in the nature of prebreakdown streamers in liquid dielectrics","authors":"P. Mckenny, P. McGrath","doi":"10.1109/CEIDP.1982.7726571","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726571","url":null,"abstract":"Optical techniques have previously been established and used to record the events that lead to breakdown in liquid insulants. Schlieren, shadowgraph, and scattered light arrangements have been employed to render visible the refractive index perturbations induced by the prebreakdown disturbances [1-4]. Although some uniform field studies have been made [4], most work has been accomplished using highly divergent electrode configurations in order that polarity effects may be separated.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"105 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":"121128824","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":"Electrical and mechanical properties in epoxy resin after gamma-radiation and LOCA simulation","authors":"K. Yahagi, T. Amakawa, N. Tada, K. Sonoda, O. Hayashi, T. Tanaka, S. Hirabayashi","doi":"10.1109/CEIDP.1982.7726539","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726539","url":null,"abstract":"Electrical and mechanical properties of three kinds of epoxy resin were investigated after gamma-radiation and LOCA simulation. The three kinds of epoxy resin were Bisphenol-A class (designated R1), Phenol Novolac Type (R-2), and Bismaleimide Triazine modified Type (R-3). Bismaleimide Triazine modified Type was estimated to be excellent for an insulating material used in a primary container vessel (PCV). Then, a composite of R-3 with Nomex base was prepared for testing as a better insulating system for a LOCA in PCV. This composite also showed excellent electrical and mechanical properties for LOCA simulation.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"31 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":"126918788","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":"Bimolecular recombination rate in FEP-Teflon","authors":"J. Hagekyriakou, R. Fleming","doi":"10.1109/CEIDP.1982.7726522","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726522","url":null,"abstract":"TSC in thin films of the co-polymer poly (hexa-fluoropropylene-tetrafluoroethylene)(commonly called FEP-Teflon) exposed to electron irradiation has been widely studied [1,2], because of the practical advantages this material offers when used to fabricate electrets. Irradiation is usually performed in open-circuit in the temperature range 273–300 K, the sample then being short-circuited and heated at a constant rate (typically 1–3 K/min) to a maximum temperature around 500 K.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"40 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":"114698360","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 technique for the measurement of dielectric loss of polyethylene insulated coaxial cables","authors":"D. Walters","doi":"10.1109/CEIDP.1982.7726544","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726544","url":null,"abstract":"The polyethylene dielectrics used in underwater communication cables have extremely low power factors at transmission frequencies: typically between 60 × 10−6 and 120 × 10−6 at 45 MHz, It is important to be able to measure the loss of the dielectric accurately before, during and after cable manufacture in order to determine the effects of contamination, processing, and working environment. Until now loss measurements with the required accuracy (∼1μR) could only be made using thin, circular specimens of the material as in the method described by Hartshorn and Ward {1}, Although this technique has given extremely accurate results, particularly as applied in the apparatus developed by Reddish and Buckingham {2}, the disadvantages of having to use flat moulded specimens as opposed to pieces of actual cable are obvious.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"61 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":"122128952","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":"UV degradation of polymers for outdoor HV equipment: Aging diagnostic test using FMIR techniques","authors":"M. Duval, C. D. de Tourreil, Y. Giguere","doi":"10.1109/CEIDP.1982.7726537","DOIUrl":"https://doi.org/10.1109/CEIDP.1982.7726537","url":null,"abstract":"Insulators with polymer weather sheds are finding increasing use in high-voltage overhead transmission lines. Compared to conventional ceramic insulators, they have several advantages: not only are they lightweight and easy to install but they have better insulation strength under certain contaminated conditions. Apart from the design or manufacturing process, the various types of polymer insulator commercially available also differ from the point of view of the rubber base: silicone rubber, ethylene-propylene rubber (EPM) or ethyl-ene-propylene-diene rubber (EPDM), as well as the fillers and additives used. Ranking the best polymer formulations is still a matter of discussion in the industry. Accelerated-aging tests are usually performed for that purpose, and a wide variety of aging criteria have been proposed to evaluate polymer degradation, such as tensile strength, elongation to break, tracking endurance [1], [2] hardness, swelling or surface oxidation by ATR infrared spectrometry [3]. However, dependable quantitative data allowing definite conclusions to be drawn about the long-term reliability of insulators in service cannot always be obtained by these techniques. The present work investigates a new method of evaluation of surface chalking of the insulators, using FMIR infrared techniques.","PeriodicalId":301436,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1982","volume":"139 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":"116759787","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}