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.1995.496570
J.V. Serdjuk, I. Bozhko, N.I. Falkovsky
Quantitative data on breakdown voltages of non-isothermically heated inert gases at temperatures up to 3600 K are obtained. Existence of polarity effect of breakdown voltages U/sub br/ in uniform electric field at temperatures more than /spl sim/1700 K is established. At cathode heating up to specified temperatures breakdown voltages sharply decrease comparing with U/sub br/ at positive polarity of a heating electrode up to tens and units of volts because of increase of current of thermal electron emission. At anode heating breakdown voltages are determined by pattern or temperature field between electrodes. With this Paschen's law is used for evaluation of insulation properties of non-isothermically heated gases up to 3600 K temperatures.
{"title":"Breakdown of gaseous dielectrics at non-isothermic heating up to 3600 K","authors":"J.V. Serdjuk, I. Bozhko, N.I. Falkovsky","doi":"10.1109/ISEIM.1995.496570","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496570","url":null,"abstract":"Quantitative data on breakdown voltages of non-isothermically heated inert gases at temperatures up to 3600 K are obtained. Existence of polarity effect of breakdown voltages U/sub br/ in uniform electric field at temperatures more than /spl sim/1700 K is established. At cathode heating up to specified temperatures breakdown voltages sharply decrease comparing with U/sub br/ at positive polarity of a heating electrode up to tens and units of volts because of increase of current of thermal electron emission. At anode heating breakdown voltages are determined by pattern or temperature field between electrodes. With this Paschen's law is used for evaluation of insulation properties of non-isothermically heated gases up to 3600 K temperatures.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"2008 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":"134475734","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.1995.496608
T. Ozaki, K. Abe, Y. Ito, T. Umemura
The partial discharge behavior of a layered polymer film/air gap insulation system was studied. It was found that the divided voltage of the air gap calculated from the partial discharge inception voltage coincided well with the breakdown voltage of the air gap estimated from Paschen's law. It was suggested that the polarity difference of the discharge magnitude-repetition rate distribution, which appeared in the overvoltage region, could be due to injection of electrons from the exposed electrode.
{"title":"A partial discharge behavior of piled PET films","authors":"T. Ozaki, K. Abe, Y. Ito, T. Umemura","doi":"10.1109/ISEIM.1995.496608","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496608","url":null,"abstract":"The partial discharge behavior of a layered polymer film/air gap insulation system was studied. It was found that the divided voltage of the air gap calculated from the partial discharge inception voltage coincided well with the breakdown voltage of the air gap estimated from Paschen's law. It was suggested that the polarity difference of the discharge magnitude-repetition rate distribution, which appeared in the overvoltage region, could be due to injection of electrons from the exposed electrode.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"32 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":"132066232","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.1995.496607
N. Tohyama, Y. Tateno, H. Sato, N. Shimizu
We have studied extruded solid polymer insulation for superconducting power transmission cables. Recently, we examined tree initiation properties in polyethylene absorbing helium gas with AC and impulse voltages. As a result, we found that helium gas decreases AC tree initiation voltage. This paper reports the detailed results and discuss the effect of Penning ionization on tree initiation.
{"title":"Tree initiation in polyethylene absorbing helium gas","authors":"N. Tohyama, Y. Tateno, H. Sato, N. Shimizu","doi":"10.1109/ISEIM.1995.496607","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496607","url":null,"abstract":"We have studied extruded solid polymer insulation for superconducting power transmission cables. Recently, we examined tree initiation properties in polyethylene absorbing helium gas with AC and impulse voltages. As a result, we found that helium gas decreases AC tree initiation voltage. This paper reports the detailed results and discuss the effect of Penning ionization on tree initiation.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"15 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":"132206923","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.1995.496562
X. Hang, F. Bai, Z. Yan
A digital measurement technique for on-line measurement of the dielectric loss angle of capacitive-type insulation by means of an 8098 single chip microcontroller is presented. The principle of the method and the hardware and software design are discussed.
{"title":"On-line measuring dielectric loss angle of capacitive-type insulation by using digital measurement technique","authors":"X. Hang, F. Bai, Z. Yan","doi":"10.1109/ISEIM.1995.496562","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496562","url":null,"abstract":"A digital measurement technique for on-line measurement of the dielectric loss angle of capacitive-type insulation by means of an 8098 single chip microcontroller is presented. The principle of the method and the hardware and software design are discussed.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"47 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":"116599092","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.1995.496523
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}
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