Pub Date : 1989-10-29DOI: 10.1109/CEIDP.1989.69574
H.F. Li, Z. Meng, G. Huang
(LaNa)/sub 0.5/Bi/sub 2/Nb/sub 2/O/sub 9/ (LNBN) thin films have been prepared by RF sputtering with substrate temperatures up to 450 degrees C. The structural orientation of the annealed films versus substrate temperature is shown to be complex. The substrate temperature had a profound influence on the dielectric properties of the LNBN thin films. The LNBN thin films display a relaxation phase transition.<>
{"title":"Preparation of LNBN thin films by RF sputtering and their dielectric properties","authors":"H.F. Li, Z. Meng, G. Huang","doi":"10.1109/CEIDP.1989.69574","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69574","url":null,"abstract":"(LaNa)/sub 0.5/Bi/sub 2/Nb/sub 2/O/sub 9/ (LNBN) thin films have been prepared by RF sputtering with substrate temperatures up to 450 degrees C. The structural orientation of the annealed films versus substrate temperature is shown to be complex. The substrate temperature had a profound influence on the dielectric properties of the LNBN thin films. The LNBN thin films display a relaxation phase transition.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"41 1","pages":"369-374"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86500770","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}
Pub Date : 1989-10-01DOI: 10.1109/CEIDP.1989.69523
Aage Pedersen
Quantitative criteria are derived for the onset of breakdown in atmospheric air and similar weakly electronegative gases. A comparable criterion is then formulated for strongly electronegative gases such as SF/sub 6/. These criteria contain no quantities other than those which can be obtained directly from breakdown voltage measurements in a uniform field, i.e. from Paschen curve data. No specific data are required for the ionizing coefficients of the gas. The advantage, from an engineering point of view, is that it is much easier to perform reliable Paschen curve measurements than it is to measure ionization growth parameters. The price paid is that criteria formulated in this way cannot be used to yield unknown Paschen curves. The criteria can be applied to any nonuniform field configuration provided the electrostatic field distribution is known. Moreover, in many cases a simple analytical approximation to the field distribution can render an extensive calculation of the electrostatic field unnecessary. The discussion deals exclusively with situations in which the onset of breakdown in the system is synonymous with the onset of a corona discharge.<>
{"title":"On the electrical breakdown of gaseous dielectrics-an engineering approach","authors":"Aage Pedersen","doi":"10.1109/CEIDP.1989.69523","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69523","url":null,"abstract":"Quantitative criteria are derived for the onset of breakdown in atmospheric air and similar weakly electronegative gases. A comparable criterion is then formulated for strongly electronegative gases such as SF/sub 6/. These criteria contain no quantities other than those which can be obtained directly from breakdown voltage measurements in a uniform field, i.e. from Paschen curve data. No specific data are required for the ionizing coefficients of the gas. The advantage, from an engineering point of view, is that it is much easier to perform reliable Paschen curve measurements than it is to measure ionization growth parameters. The price paid is that criteria formulated in this way cannot be used to yield unknown Paschen curves. The criteria can be applied to any nonuniform field configuration provided the electrostatic field distribution is known. Moreover, in many cases a simple analytical approximation to the field distribution can render an extensive calculation of the electrostatic field unnecessary. The discussion deals exclusively with situations in which the onset of breakdown in the system is synonymous with the onset of a corona discharge.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"11 1","pages":"21-58"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84673406","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}
Pub Date : 1989-10-01DOI: 10.1109/CEIDP.1989.69559
Y. Ohki, Y. Tanaka, Masaaki Ikdea
The space-charge-formation characteristics of ethylene-styrene copolymer were investigated on the basis of DC conduction, TSC (thermally stimulated current), TPC (thermal pulse current), RIC (radiation-induced current), and vacuum-ultraviolet spectroscopy measurements. The results suggest that benzene rings act as trapping centers when the styrene content is as low as 0.2 wt.%, but that they tend to assist carrier transportation due to the overlap of pi -electron clouds.<>
{"title":"Carrier traps in ethylene-styrene copolymer","authors":"Y. Ohki, Y. Tanaka, Masaaki Ikdea","doi":"10.1109/CEIDP.1989.69559","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69559","url":null,"abstract":"The space-charge-formation characteristics of ethylene-styrene copolymer were investigated on the basis of DC conduction, TSC (thermally stimulated current), TPC (thermal pulse current), RIC (radiation-induced current), and vacuum-ultraviolet spectroscopy measurements. The results suggest that benzene rings act as trapping centers when the styrene content is as low as 0.2 wt.%, but that they tend to assist carrier transportation due to the overlap of pi -electron clouds.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"21 6 1","pages":"278-283"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91218056","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}
Pub Date : 1989-01-01DOI: 10.1109/CEIDP.1989.69593
K. Labus-Nawrat, S. Grzybowski
The authors present data obtained from tests conducted on an SF/sub 6/ GIS (gas-insulated switchgear) model, 123 kV, having coaxial cylinders of 240/80-mm diameter in the presence of mobile particles. In the case of a vertical GIS construction and in the presence of conducting particles, a great hazard to the insulation is shown to occur when overvoltages appear in service. There is a wide range of imminent particles since heavy and light particles are included. The presence of conducting particles in the case of a conic spacer insulator also causes a hazard to insulation due to overvoltages appearing in service. The detection of particles left after final assembly on site and of those located on the spacer insulators which were tested in 123-kV GIS is possible using tests with applied 185 kV AC voltage and tests with impulse voltage at 80% basic insulation level.<>
{"title":"Effect of mobile conducting particles on the electrical strength of the insulation system of SF/sub 6/ insulated switchgear","authors":"K. Labus-Nawrat, S. Grzybowski","doi":"10.1109/CEIDP.1989.69593","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69593","url":null,"abstract":"The authors present data obtained from tests conducted on an SF/sub 6/ GIS (gas-insulated switchgear) model, 123 kV, having coaxial cylinders of 240/80-mm diameter in the presence of mobile particles. In the case of a vertical GIS construction and in the presence of conducting particles, a great hazard to the insulation is shown to occur when overvoltages appear in service. There is a wide range of imminent particles since heavy and light particles are included. The presence of conducting particles in the case of a conic spacer insulator also causes a hazard to insulation due to overvoltages appearing in service. The detection of particles left after final assembly on site and of those located on the spacer insulators which were tested in 123-kV GIS is possible using tests with applied 185 kV AC voltage and tests with impulse voltage at 80% basic insulation level.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"26 1","pages":"483-488"},"PeriodicalIF":0.0,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72716096","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}