Pub Date : 1995-09-17DOI: 10.1109/ISEIM.1995.496498
D. Das-Gupta, P. Scarpa
The electrical ageing behaviour of a dielectric material in an adverse environment may be investigated by a study of its polarization and dielectric behaviour. The present work reports such a study with polyethylene under AC stress in a humid environment. In addition, the polarization and dielectric relaxation behaviour have also been correlated with studies of thermally stimulated discharge currents (TSDC) and thermal transient currents (TTC).
{"title":"Polarization and dielectric behaviour of AC aged polyethylene","authors":"D. Das-Gupta, P. Scarpa","doi":"10.1109/ISEIM.1995.496498","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496498","url":null,"abstract":"The electrical ageing behaviour of a dielectric material in an adverse environment may be investigated by a study of its polarization and dielectric behaviour. The present work reports such a study with polyethylene under AC stress in a humid environment. In addition, the polarization and dielectric relaxation behaviour have also been correlated with studies of thermally stimulated discharge currents (TSDC) and thermal transient currents (TTC).","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132190752","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496557
M. Onoda, K. Yoshino
The layer-by-layer self-assembly of charged polymers has recently emerged as a versatile means of processing conjugated polymers into ultra thin films with an unprecedented control over thickness and molecular architecture. To date, this method has been successfully utilized to manipulate conjugated and nonconjugated polyions, etc. Multilayer heterostructures have been designed and fabricated from various combinations of these materials to study properties unique to the specific supramolecular organizations created. In this paper, layer-by-layer self-assembly was used to fabricate extremely thin films of conducting polymers such as sulfonated polyaniline (SPAn) and poly(p-phenylene vinylene) (PPV). Finally, the fabrication of thin film light-emitting diodes based on self-assembled PPV active layers is described.
{"title":"Unique electrical properties of self-assembled ultra-thin polymer film","authors":"M. Onoda, K. Yoshino","doi":"10.1109/ISEIM.1995.496557","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496557","url":null,"abstract":"The layer-by-layer self-assembly of charged polymers has recently emerged as a versatile means of processing conjugated polymers into ultra thin films with an unprecedented control over thickness and molecular architecture. To date, this method has been successfully utilized to manipulate conjugated and nonconjugated polyions, etc. Multilayer heterostructures have been designed and fabricated from various combinations of these materials to study properties unique to the specific supramolecular organizations created. In this paper, layer-by-layer self-assembly was used to fabricate extremely thin films of conducting polymers such as sulfonated polyaniline (SPAn) and poly(p-phenylene vinylene) (PPV). Finally, the fabrication of thin film light-emitting diodes based on self-assembled PPV active layers is described.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"42 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131433517","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496541
K. Yamazawa, K. Sugiura, W. Machidori, H. Yamashita
The relation between light emission phenomena and partial discharge (PD) current pulses in liquid nitrogen under impulse voltages is reported. The results of simultaneous measurements using optical and electrical methods are shown and their significance is discussed.
{"title":"Observation of prebreakdown light emission phenomena in liquid nitrogen","authors":"K. Yamazawa, K. Sugiura, W. Machidori, H. Yamashita","doi":"10.1109/ISEIM.1995.496541","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496541","url":null,"abstract":"The relation between light emission phenomena and partial discharge (PD) current pulses in liquid nitrogen under impulse voltages is reported. The results of simultaneous measurements using optical and electrical methods are shown and their significance is discussed.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121288348","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496616
N. Yoshimura, W. xinsheng, S. Kumagai, A. Shikimura, S. Hasegawa
The tracking resistances of various polymer insulating materials under artificial acid rain are evaluated. It is shown that due to the erosion and degradation effect of acid rain, the surface of the materials becomes more rough, and the surface hydrophobicity decreases, which results in a decrease of the tracking resistance of the materials. Because of the differences of microchemical structure and physical morphology, the resistances to tracking of the various materials against acid rain are different.
{"title":"The influence of acid rain on the resistance to tracking of polymer insulating materials","authors":"N. Yoshimura, W. xinsheng, S. Kumagai, A. Shikimura, S. Hasegawa","doi":"10.1109/ISEIM.1995.496616","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496616","url":null,"abstract":"The tracking resistances of various polymer insulating materials under artificial acid rain are evaluated. It is shown that due to the erosion and degradation effect of acid rain, the surface of the materials becomes more rough, and the surface hydrophobicity decreases, which results in a decrease of the tracking resistance of the materials. Because of the differences of microchemical structure and physical morphology, the resistances to tracking of the various materials against acid rain are different.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116630191","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496615
R. Matsuoka, H. Shinokubo, K. Kondo, T. Fujimura, T. Terada
Excellent withstand voltage characteristics of silicone rubber insulators under contaminated conditions are fundamentally attributed to the migration of low molecular silicone from the bulk of silicone rubber even to the contaminants on the insulator surface. In this paper the effect of time lapse on hydrophobicity after contamination of specimen insulators was investigated in terms of receding contact angle and contamination withstand voltage.
{"title":"Artificial contamination withstand voltage characteristics of polymer insulators","authors":"R. Matsuoka, H. Shinokubo, K. Kondo, T. Fujimura, T. Terada","doi":"10.1109/ISEIM.1995.496615","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496615","url":null,"abstract":"Excellent withstand voltage characteristics of silicone rubber insulators under contaminated conditions are fundamentally attributed to the migration of low molecular silicone from the bulk of silicone rubber even to the contaminants on the insulator surface. In this paper the effect of time lapse on hydrophobicity after contamination of specimen insulators was investigated in terms of receding contact angle and contamination withstand voltage.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122589041","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496617
Gong Guoli, Zhang Peihong, Dong Guangyu, Dong Zhenhua
The influence of SF6 and SF6/N2 dissociating products on the electrical performance of epoxy ester varnish, polyesterimide varnish, polyester varnish and phenolic resin varnish commonly used in electrical equipment has been discussed. From the test results it is shown that the surface resistances and breakdown voltages of the samples all decrease after corona discharge, and they are lower in SF6/N2 than SF6.
{"title":"The influence of SF6 and SF6/N2 dissociating products on the electrical performance of several insulating varnishes","authors":"Gong Guoli, Zhang Peihong, Dong Guangyu, Dong Zhenhua","doi":"10.1109/ISEIM.1995.496617","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496617","url":null,"abstract":"The influence of SF6 and SF6/N2 dissociating products on the electrical performance of epoxy ester varnish, polyesterimide varnish, polyester varnish and phenolic resin varnish commonly used in electrical equipment has been discussed. From the test results it is shown that the surface resistances and breakdown voltages of the samples all decrease after corona discharge, and they are lower in SF6/N2 than SF6.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122095553","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496619
A. Nakayama
Fuji Electric has recently introduced a vacuum pressure impregnation (VPI) system for air-cooled turbine generator stator windings in the 30/spl sim/260MVA class. To accompany this, we have also developed a new insulation system for this VPI system, called the F-resin/GII insulation system. This insulation system is equipped with characteristics for operation over a long period of time and excellent heat cycle resistance. In this article, an evaluation of the mechanical characteristics of the main insulation for the new VPI insulation system is described.
{"title":"Evaluation of mechanical characteristics for a new vacuum pressure impregnation insulation system","authors":"A. Nakayama","doi":"10.1109/ISEIM.1995.496619","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496619","url":null,"abstract":"Fuji Electric has recently introduced a vacuum pressure impregnation (VPI) system for air-cooled turbine generator stator windings in the 30/spl sim/260MVA class. To accompany this, we have also developed a new insulation system for this VPI system, called the F-resin/GII insulation system. This insulation system is equipped with characteristics for operation over a long period of time and excellent heat cycle resistance. In this article, an evaluation of the mechanical characteristics of the main insulation for the new VPI insulation system is described.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"274 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121360354","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496526
Geng Fenghui, G. Liang-yu, Guo Wenyuan
The organic PTCR (Positive Temperature Coefficient Resistance) material that consists of the polymer, the conductive particle and additives has been studied in this paper. The crystallinity of the polymer and the dispersivity of the conductive particle can obviously affect conducting property of the material. This property belongs to conductive characteristic of the composite dielectric, and is a kind of crystal-boundary-controlled conduction. The paper has investigated conducting property of the material, in order to gain more applications in energy saving and fire resistance.
{"title":"Study on conducting property of the organic PTCR material","authors":"Geng Fenghui, G. Liang-yu, Guo Wenyuan","doi":"10.1109/ISEIM.1995.496526","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496526","url":null,"abstract":"The organic PTCR (Positive Temperature Coefficient Resistance) material that consists of the polymer, the conductive particle and additives has been studied in this paper. The crystallinity of the polymer and the dispersivity of the conductive particle can obviously affect conducting property of the material. This property belongs to conductive characteristic of the composite dielectric, and is a kind of crystal-boundary-controlled conduction. The paper has investigated conducting property of the material, in order to gain more applications in energy saving and fire resistance.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114413231","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496549
E. Neagu, R. Neagu
Summary form only given, as follows. It is known that the conduction current through a dielectric material is related to space charge accumulation in the material. It is important to know the amount of charge stored in dielectric. Valuable information concerning charge stored in a dielectric material is obtained by using thermally stimulated discharge current method. We propose to use a variant of this method for space charge study as follows. An electric field is applied to the sample for a given time at a sufficiently high temperature so that the space charge formation process has an important role. Immediately after field removal the sample is not cooled down for polarization and space charge freezing. In contrast the sample is heated up and the released current is measured. Because the temperature is higher than forming temperature the measured current is determined by space charge existing in the sample; this method is known as thermally stimulated space charge current. The sample is heated at a temperature at which it is still mechanically stable. The experiment is continued at this temperature by measuring the isothermal final discharging current. When the measured current is in the parasitic limit it is considered that all the existing space charge in the dielectric has vanished. The relation between the total charge that flows through circuit during charging and the total charge liberated from the dielectric is analyzed.
{"title":"A method for space charge study in dielectrics","authors":"E. Neagu, R. Neagu","doi":"10.1109/ISEIM.1995.496549","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496549","url":null,"abstract":"Summary form only given, as follows. It is known that the conduction current through a dielectric material is related to space charge accumulation in the material. It is important to know the amount of charge stored in dielectric. Valuable information concerning charge stored in a dielectric material is obtained by using thermally stimulated discharge current method. We propose to use a variant of this method for space charge study as follows. An electric field is applied to the sample for a given time at a sufficiently high temperature so that the space charge formation process has an important role. Immediately after field removal the sample is not cooled down for polarization and space charge freezing. In contrast the sample is heated up and the released current is measured. Because the temperature is higher than forming temperature the measured current is determined by space charge existing in the sample; this method is known as thermally stimulated space charge current. The sample is heated at a temperature at which it is still mechanically stable. The experiment is continued at this temperature by measuring the isothermal final discharging current. When the measured current is in the parasitic limit it is considered that all the existing space charge in the dielectric has vanished. The relation between the total charge that flows through circuit during charging and the total charge liberated from the dielectric is analyzed.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114959291","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496499
K. Yoshino
It is demonstrated that various types of novel polymers exhibiting not only insulating but also conducting and even superconducting characteristics can be prepared by appropriate molecular design. It is also indicated that the development of new synthetic methods and preparation techniques and completely new aspects appear even in the known traditional polymers. In the future, the author is convinced that polymeric materials will become much more important in electrical machines and cables.
{"title":"Novel properties of new types of conducting and insulating polymers and their composites","authors":"K. Yoshino","doi":"10.1109/ISEIM.1995.496499","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496499","url":null,"abstract":"It is demonstrated that various types of novel polymers exhibiting not only insulating but also conducting and even superconducting characteristics can be prepared by appropriate molecular design. It is also indicated that the development of new synthetic methods and preparation techniques and completely new aspects appear even in the known traditional polymers. In the future, the author is convinced that polymeric materials will become much more important in electrical machines and cables.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126853505","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}
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