Pub Date : 1995-09-17DOI: 10.1109/ISEIM.1995.496563
S. Isaka, Y. Ishioka, K. Abe
The authors measured changes in the average degree of polymerization and those in the color of insulating paper. It was found that changes in the average degree of polymerization of insulating paper were closely correlated with color difference changes. This result suggests that the average degree of polymerization of the insulating paper may be estimated by colorimetry. Furthermore, the method may be applied to the insulation diagnosis of oil impregnated transformers.
{"title":"Diagnosis by colorimetry of aged insulating paper of transformers","authors":"S. Isaka, Y. Ishioka, K. Abe","doi":"10.1109/ISEIM.1995.496563","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496563","url":null,"abstract":"The authors measured changes in the average degree of polymerization and those in the color of insulating paper. It was found that changes in the average degree of polymerization of insulating paper were closely correlated with color difference changes. This result suggests that the average degree of polymerization of the insulating paper may be estimated by colorimetry. Furthermore, the method may be applied to the insulation diagnosis of oil impregnated transformers.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"136 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":"129918427","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.1995.496564
M. Kakuta
The author is studying an insulation diagnosis system for XLPE power cables by applying an AC voltage on test specimens to detect frequency signals lower than the AC frequency, and has found that signals are generated not only by insulation defects. This paper discusses the new concept that signal sources in the test voltage pass through deteriorated parts of insulation and defective parts more easily. The origin of the signal and how it functions are discussed based on electric circuit theory.
{"title":"Electric circuit theoretical insulation diagnosis for XLPE power cables","authors":"M. Kakuta","doi":"10.1109/ISEIM.1995.496564","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496564","url":null,"abstract":"The author is studying an insulation diagnosis system for XLPE power cables by applying an AC voltage on test specimens to detect frequency signals lower than the AC frequency, and has found that signals are generated not only by insulation defects. This paper discusses the new concept that signal sources in the test voltage pass through deteriorated parts of insulation and defective parts more easily. The origin of the signal and how it functions are discussed based on electric circuit theory.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"55 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":"133170440","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.1995.496586
EunJoo Kim, T. Takeda, Y. Ohki
Through the measurements of TSC and space charge distribution, it is concluded that the low-temperature /spl beta/ peak in TSC and the conduction current in the amorphous thermoplastic polymer polyethersulfone (PES) is mainly due to impurity ions.
{"title":"Low-temperature TSC peak of polyethersulfone","authors":"EunJoo Kim, T. Takeda, Y. Ohki","doi":"10.1109/ISEIM.1995.496586","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496586","url":null,"abstract":"Through the measurements of TSC and space charge distribution, it is concluded that the low-temperature /spl beta/ peak in TSC and the conduction current in the amorphous thermoplastic polymer polyethersulfone (PES) is mainly due to impurity ions.","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":"130126452","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.1995.496567
Takahiko Maeda, K. Haga, T. Maeda
We measure the creepage breakdown characteristics of printed wiring boards in silicone gel and obtain an experimental equation. This equation allows us to consider separately the different factors (creepage distance, intrinsic capacity, relative permittivity, insulation layer thickness and electrode location) affecting breakdown voltage. Further, we are able to predict accurately the breakdown limit of insulation in two planes.
{"title":"Creepage breakdown characteristics of printed wiring board in silicone gel","authors":"Takahiko Maeda, K. Haga, T. Maeda","doi":"10.1109/ISEIM.1995.496567","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496567","url":null,"abstract":"We measure the creepage breakdown characteristics of printed wiring boards in silicone gel and obtain an experimental equation. This equation allows us to consider separately the different factors (creepage distance, intrinsic capacity, relative permittivity, insulation layer thickness and electrode location) affecting breakdown voltage. Further, we are able to predict accurately the breakdown limit of insulation in two planes.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"1 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":"129303017","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.1995.496523
Xiaobin Xu, T. Kubota, M. Iwamoto
We developed a transient photoinduced voltage measuring system and investigated the photoinduced electron transfer in hetero-structured polyimide (PI) LB films. The photoinduced transient voltage depended on PORPI layers (n), indicating that there are two kinds of electron transfer mechanism. For n>3, the maximum value of the induced transient voltage increased as n increased. We estimated that they were transported in PORPI films at a distance of 2-4 nm.
{"title":"Detection of the electron transfer in hetero-structured polyimide LB films by transient photoinduced voltage","authors":"Xiaobin Xu, T. Kubota, M. Iwamoto","doi":"10.1109/ISEIM.1995.496523","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496523","url":null,"abstract":"We developed a transient photoinduced voltage measuring system and investigated the photoinduced electron transfer in hetero-structured polyimide (PI) LB films. The photoinduced transient voltage depended on PORPI layers (n), indicating that there are two kinds of electron transfer mechanism. For n>3, the maximum value of the induced transient voltage increased as n increased. We estimated that they were transported in PORPI films at a distance of 2-4 nm.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"55 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":"129307446","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.1995.496578
E. Itoh, Y. Niwa, M. Iwamoto
Surface potentials of heat-treated PI LB films deposited on Au, Cr, Al and ITO electrodes were measured in a dark vacuum vessel at various temperatures before and after photoirradiation. The surface potential saturated when the number of deposited layers was several tens. The saturated surface potential was a linear function of the work function of electrodes at temperatures between -100/spl deg/C and 150/spl deg/C before photoirradiation, and at room temperature after photoirradiation. It was suggested that excess charges were transferred from electrodes into PI LB films until thermodynamic equilibrium was established at the interface. We also measured the surface potential of four kinds of PI LB films. The potential of polyimide with electron acceptors changed negatively, and the potential of polyimide with electron donors changed positively as the temperature increased. In contrast, the potential of polyimide with electron acceptors changed positively, and the potential of polyimide with electron donors changed negatively with photoirradiation.
{"title":"Temperature and photoirradiation dependence of electrostatic phenomena at metal/polyimide LB film interface","authors":"E. Itoh, Y. Niwa, M. Iwamoto","doi":"10.1109/ISEIM.1995.496578","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496578","url":null,"abstract":"Surface potentials of heat-treated PI LB films deposited on Au, Cr, Al and ITO electrodes were measured in a dark vacuum vessel at various temperatures before and after photoirradiation. The surface potential saturated when the number of deposited layers was several tens. The saturated surface potential was a linear function of the work function of electrodes at temperatures between -100/spl deg/C and 150/spl deg/C before photoirradiation, and at room temperature after photoirradiation. It was suggested that excess charges were transferred from electrodes into PI LB films until thermodynamic equilibrium was established at the interface. We also measured the surface potential of four kinds of PI LB films. The potential of polyimide with electron acceptors changed negatively, and the potential of polyimide with electron donors changed positively as the temperature increased. In contrast, the potential of polyimide with electron acceptors changed positively, and the potential of polyimide with electron donors changed negatively with photoirradiation.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"23 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":"129679476","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}
With the increasing operating voltages of power systems, the reliability of insulating systems which depends on the defects within the insulation becomes more and more important. It is necessary to develop an accurate, simple and reliable method for defect detection. In this paper, an acoustic signal analysis method for detection of defects in insulation systems based on wavelet transforms is introduced. Some applications of wavelet transforms in detection of defects in insulating systems are given.
{"title":"Detection of defects in insulating systems with wavelet technique","authors":"Xinyan Wu, Guangning Wu, Hui Ma, Hengkun Xie, Songzhen Wu","doi":"10.1109/ISEIM.1995.496610","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496610","url":null,"abstract":"With the increasing operating voltages of power systems, the reliability of insulating systems which depends on the defects within the insulation becomes more and more important. It is necessary to develop an accurate, simple and reliable method for defect detection. In this paper, an acoustic signal analysis method for detection of defects in insulation systems based on wavelet transforms is introduced. Some applications of wavelet transforms in detection of defects in insulating systems are given.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"7 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":"130884538","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.1995.496613
K. Aska Juste, Y. Suzuki, K. Satoh, H. Itoh, Y. Nakao, Y. Sakai, H. Tagashira
High speed Schlieren photography was used to investigate the process in which an impulse breakdown might propagate across the surface of artificial rainwater. Contrary to its well known conductivity dependence, the streamer discharge in acid rain revealed no significant changes in this experimental condition when the pH value of the electrolyte was altered.
{"title":"Studies on the propagation of the creepage discharge across the surface of artificial acid rainwater","authors":"K. Aska Juste, Y. Suzuki, K. Satoh, H. Itoh, Y. Nakao, Y. Sakai, H. Tagashira","doi":"10.1109/ISEIM.1995.496613","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496613","url":null,"abstract":"High speed Schlieren photography was used to investigate the process in which an impulse breakdown might propagate across the surface of artificial rainwater. Contrary to its well known conductivity dependence, the streamer discharge in acid rain revealed no significant changes in this experimental condition when the pH value of the electrolyte was altered.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"94 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":"131304564","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.1995.496518
Wang Hui, Xu Chuan-xiang, M. Dang
Organic silicon paint adding polyester (SPP) is chosen as the surface protection material to study the effects of solidifying technology on the insulation film's resistivity and the sustained voltage of a diode protected by SPP at high temperature. It is found that the solidifying condition changes the resistivity of the protection film and the sustained voltage of diodes at high temperature. When a suitable solidifying condition is chosen, the sustained voltage vs. temperature characteristics of diodes are improved. The characteristics are better when diodes are solidified in the condition in which the resistivity of the organic protection film is higher.
{"title":"Effect of organic electronic insulation material on the sustained voltage of diode at high temperature","authors":"Wang Hui, Xu Chuan-xiang, M. Dang","doi":"10.1109/ISEIM.1995.496518","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496518","url":null,"abstract":"Organic silicon paint adding polyester (SPP) is chosen as the surface protection material to study the effects of solidifying technology on the insulation film's resistivity and the sustained voltage of a diode protected by SPP at high temperature. It is found that the solidifying condition changes the resistivity of the protection film and the sustained voltage of diodes at high temperature. When a suitable solidifying condition is chosen, the sustained voltage vs. temperature characteristics of diodes are improved. The characteristics are better when diodes are solidified in the condition in which the resistivity of the organic protection film is higher.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"113 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":"116030796","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.1995.496587
EunJoo Kim, G. Kato, T. Takeda, Y. Ohki
It is shown that when the thermoplastic polymer polyethersulfone (PES) is irradiated by /spl gamma/-rays, the DC conduction current and thermally stimulated current (TSC) decrease. This is probably because the progress of crosslinking induced by the irradiation hinders the transport of ions.
{"title":"Effect of /spl gamma/-ray irradiation on thermally stimulated current in polyethersulfone","authors":"EunJoo Kim, G. Kato, T. Takeda, Y. Ohki","doi":"10.1109/ISEIM.1995.496587","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496587","url":null,"abstract":"It is shown that when the thermoplastic polymer polyethersulfone (PES) is irradiated by /spl gamma/-rays, the DC conduction current and thermally stimulated current (TSC) decrease. This is probably because the progress of crosslinking induced by the irradiation hinders the transport of ions.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"24 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":"127045281","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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