Pub Date : 2008-10-31DOI: 10.1109/ISEIM.2008.4664604
K. Kobayashi, R. Takeuchi, Y. Higashimura
Insulation technology is important for supporting the reliability of basic generators, so continuous development of the technology is needed, and various new products may be developed based on this technology.
{"title":"Insulation technology of newly developed generators","authors":"K. Kobayashi, R. Takeuchi, Y. Higashimura","doi":"10.1109/ISEIM.2008.4664604","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664604","url":null,"abstract":"Insulation technology is important for supporting the reliability of basic generators, so continuous development of the technology is needed, and various new products may be developed based on this technology.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123143699","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664541
M. Abdelguerfi, A. Soualmia
A polar dielectric effect is characterized by a spectrum of relaxation which follows Debye's model when the relaxation time is slightly distributed generally the polar aspect appears through the frequency measurement of the dielectric permittivity of which the real part interprets dispersion and the imaginary part interprets the absorption. We propose a process which allows the instantaneous description of polar dielectric material without conductivity or with a poor conductivity. Sample under test excited by a level of tension answers by another level of tension which is a temporal response.
{"title":"Dielectric relaxation in time domain reflectometry (TDR)","authors":"M. Abdelguerfi, A. Soualmia","doi":"10.1109/ISEIM.2008.4664541","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664541","url":null,"abstract":"A polar dielectric effect is characterized by a spectrum of relaxation which follows Debye's model when the relaxation time is slightly distributed generally the polar aspect appears through the frequency measurement of the dielectric permittivity of which the real part interprets dispersion and the imaginary part interprets the absorption. We propose a process which allows the instantaneous description of polar dielectric material without conductivity or with a poor conductivity. Sample under test excited by a level of tension answers by another level of tension which is a temporal response.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"9 13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129015439","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664591
M. Muhr, C. Sumereder
Beside the classical oil analysis there were new methods to determine the condition of the electric insulation system of transformers. The aging of the insulation system is influenced dominant by the water content of mineral oil. For this reason the moisture determination with chemical analysis and dielectric measurements were essential.
{"title":"Transformer condition determination methods","authors":"M. Muhr, C. Sumereder","doi":"10.1109/ISEIM.2008.4664591","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664591","url":null,"abstract":"Beside the classical oil analysis there were new methods to determine the condition of the electric insulation system of transformers. The aging of the insulation system is influenced dominant by the water content of mineral oil. For this reason the moisture determination with chemical analysis and dielectric measurements were essential.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127591277","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664480
Y. Lida, T. Mori
N,N'-di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl) 4,4'-diamine (NPD) is often used as a hole-transport material in organic light-emitting diodes (OLEDs). The polycrystallization of organic films in OLEDs is thought to be one of the degradation factors of the device performance. It is found that the generation and growth of polycrystalline region in NPD film can be efficiently suppressed by alternate deposition method. The generation of polycrystalline region in the alternate structure specimen depends on the top layer material. The OLEDs having alternate hole-transport layer have the similar initial EL properties as the OLEDs having organic alloy and only NPD hole-transport layer.
{"title":"Stabilization of hole transport layer by alternate deposition for organic light-emitting diodes","authors":"Y. Lida, T. Mori","doi":"10.1109/ISEIM.2008.4664480","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664480","url":null,"abstract":"N,N'-di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl) 4,4'-diamine (NPD) is often used as a hole-transport material in organic light-emitting diodes (OLEDs). The polycrystallization of organic films in OLEDs is thought to be one of the degradation factors of the device performance. It is found that the generation and growth of polycrystalline region in NPD film can be efficiently suppressed by alternate deposition method. The generation of polycrystalline region in the alternate structure specimen depends on the top layer material. The OLEDs having alternate hole-transport layer have the similar initial EL properties as the OLEDs having organic alloy and only NPD hole-transport layer.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128317553","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664471
Suwarno, I. S. Darma
From the experimental results some conclusions can be drawn as follows. The properties of mixture between mineral oil and natural ester from palm oil in general strongly affected by the ester content. Increasing the ester content significantly enhance the dielectric breakdown. The increase of the ester content also resulting in a higher the losses factor especially at temperature of 100degC. Viscosity and density of the mixture slightly increased with the ester content but significantly decreased with temperature. The acidity of the oil mixtures almost linearly increased with the ester content. Taking into account the requirements from standard, the mixture of natural ester from palm oil and mineral oil with ester content of 50% is considered as good enough to be used as a high voltage insulating liquid.
{"title":"Dielectric properties of mixtures between mineral oil and natural ester","authors":"Suwarno, I. S. Darma","doi":"10.1109/ISEIM.2008.4664471","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664471","url":null,"abstract":"From the experimental results some conclusions can be drawn as follows. The properties of mixture between mineral oil and natural ester from palm oil in general strongly affected by the ester content. Increasing the ester content significantly enhance the dielectric breakdown. The increase of the ester content also resulting in a higher the losses factor especially at temperature of 100degC. Viscosity and density of the mixture slightly increased with the ester content but significantly decreased with temperature. The acidity of the oil mixtures almost linearly increased with the ester content. Taking into account the requirements from standard, the mixture of natural ester from palm oil and mineral oil with ester content of 50% is considered as good enough to be used as a high voltage insulating liquid.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"29 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125692209","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664571
Y. Takatsuka, S. Kitamura, T. Akazawa, T. Takahashi, M. Minagawa, Y. Ohdaira, A. Baba, K. Shinbo, K. Kato, F. Kaneko
Field-effect transistors were prepared with magnesium phthalocyanine (MgPc) and vanadium pentoxide (V2O5). Vapor treatments of several organic solvents were carried out for MgPc thin films. The UV-vis absorption spectra, surface morphologies, X-ray diffraction patterns were largely changed with the treatments. The FET characteristics were also improved by the treatments and dichloromethane treatment induced the largest improvement. Furthermore, V2O5 film, which is used as carrier generation layer in organic light-emitting diodes, were inserted in the FET and the FET characteristic was changed. The vapor treatment and V2O5 insertion should be used for controlling FET performance.
{"title":"Preparation and evaluation of phthalocyanine/vanadium oxide field-effect transistors","authors":"Y. Takatsuka, S. Kitamura, T. Akazawa, T. Takahashi, M. Minagawa, Y. Ohdaira, A. Baba, K. Shinbo, K. Kato, F. Kaneko","doi":"10.1109/ISEIM.2008.4664571","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664571","url":null,"abstract":"Field-effect transistors were prepared with magnesium phthalocyanine (MgPc) and vanadium pentoxide (V2O5). Vapor treatments of several organic solvents were carried out for MgPc thin films. The UV-vis absorption spectra, surface morphologies, X-ray diffraction patterns were largely changed with the treatments. The FET characteristics were also improved by the treatments and dichloromethane treatment induced the largest improvement. Furthermore, V2O5 film, which is used as carrier generation layer in organic light-emitting diodes, were inserted in the FET and the FET characteristic was changed. The vapor treatment and V2O5 insertion should be used for controlling FET performance.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125756930","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664565
O. Kvien, G. Berg, J. Holto
Subsea installations on the sea bed at great depth require insulation materials with high reliability. Failures of such installations introduce difficult maintenance and high costs. This involves the need of reliable (insulation) materials and testing of such. The purpose of our activity is to build a test facility that can test both well-known and new insulation material samples as well as high voltage systems and apparatus. The qualification methods are based on existing international standards, with the aim of proposing and qualifying new QA and FAT tests for the subsea service environment. This paper presents some of the tests we have carried out on insulation materials. The experiments showed that the atmosphere is important; humidity introduces the risk of build up of a connection (solid bridge) between the electrode and insulation surface. High pressure reduces the area exposed to surface discharges and thereby increases the wear of the surface on that smaller area.
{"title":"Partial discharge testing of subsea insulation materials development of testing methods","authors":"O. Kvien, G. Berg, J. Holto","doi":"10.1109/ISEIM.2008.4664565","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664565","url":null,"abstract":"Subsea installations on the sea bed at great depth require insulation materials with high reliability. Failures of such installations introduce difficult maintenance and high costs. This involves the need of reliable (insulation) materials and testing of such. The purpose of our activity is to build a test facility that can test both well-known and new insulation material samples as well as high voltage systems and apparatus. The qualification methods are based on existing international standards, with the aim of proposing and qualifying new QA and FAT tests for the subsea service environment. This paper presents some of the tests we have carried out on insulation materials. The experiments showed that the atmosphere is important; humidity introduces the risk of build up of a connection (solid bridge) between the electrode and insulation surface. High pressure reduces the area exposed to surface discharges and thereby increases the wear of the surface on that smaller area.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133985893","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664503
H. Zhang, K. Mitobe, N. Yoshimura
We proposed a quantitative method to calculate water content of the thin materials by terahertz (THz) imaging. First, we constructed a THz imaging system by using a Tunnel injection Transit Time (TUNNETT) THz wave generator with automatic scanning control. Images of the plant leaves under different conditions were taken with the THz imaging system. We have introduced an algorithm with the attenuation law of Lambert-Beer to calculate the water contents from the THz imaging. To verify the accuracy of this method, we also took images of a piece of filter paper with different content of water. Comparing the calculated result with the measured value by the electronic balance showed that our method has a good possibility to measure the water content of the relative thin materials with non-contact and non-invasive method from the THz imaging.
{"title":"Terahertz imaging for water content measurement","authors":"H. Zhang, K. Mitobe, N. Yoshimura","doi":"10.1109/ISEIM.2008.4664503","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664503","url":null,"abstract":"We proposed a quantitative method to calculate water content of the thin materials by terahertz (THz) imaging. First, we constructed a THz imaging system by using a Tunnel injection Transit Time (TUNNETT) THz wave generator with automatic scanning control. Images of the plant leaves under different conditions were taken with the THz imaging system. We have introduced an algorithm with the attenuation law of Lambert-Beer to calculate the water contents from the THz imaging. To verify the accuracy of this method, we also took images of a piece of filter paper with different content of water. Comparing the calculated result with the measured value by the electronic balance showed that our method has a good possibility to measure the water content of the relative thin materials with non-contact and non-invasive method from the THz imaging.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131511456","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664468
Y. Murata, M. Goshowaki, C. Reddy, Y. Sekiguchi, N. Hishinuma, Y. Hayase, Y. Tanaka, T. Takada
It has been proved earlier that electric properties of polymer insulation can be improved by addition of nano-sized inorganic filler. These materials have attracted a lot of attention. With the addition of nano sized MgO filler in Low Density Polyethylene (LDPE), several improvements in material properties were observed and were already reported. In this paper, investigations on the volume resistivity and space charge distribution in XLPE/MgO nanocomposite (MgO nano-filler mixed with Cross Linked Polyethylene) material are reported. Investigations on packet like charge, observed earlier in LDPE, are also made both for XLPE and XLPE/MgO nanocomposite materials. The results indicate the suitability of XLPE/MgO nanocomposite material for HVDC insulation.
{"title":"Investigation of space charge distribution and volume resistivity of XLPE/MgO nanocomposite material under DC voltage application","authors":"Y. Murata, M. Goshowaki, C. Reddy, Y. Sekiguchi, N. Hishinuma, Y. Hayase, Y. Tanaka, T. Takada","doi":"10.1109/ISEIM.2008.4664468","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664468","url":null,"abstract":"It has been proved earlier that electric properties of polymer insulation can be improved by addition of nano-sized inorganic filler. These materials have attracted a lot of attention. With the addition of nano sized MgO filler in Low Density Polyethylene (LDPE), several improvements in material properties were observed and were already reported. In this paper, investigations on the volume resistivity and space charge distribution in XLPE/MgO nanocomposite (MgO nano-filler mixed with Cross Linked Polyethylene) material are reported. Investigations on packet like charge, observed earlier in LDPE, are also made both for XLPE and XLPE/MgO nanocomposite materials. The results indicate the suitability of XLPE/MgO nanocomposite material for HVDC insulation.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130756615","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664587
T. Ishida, M. Nagao
We have made researches on the internal partial discharge degradation phenomena of dielectric materials. In this paper, we investigate that the restrain effect of partial discharge spreading on the insulator surface by scratch or dielectric barriers. We prepared a few types of specimen for experiment to study the restrain effect of partial discharges on insulator. The 1 mm thick and 50 times 50 mm square plates made of polymethyl methacrylate (PMMA) were used for the experiments. One specimen had a scratch on the surface of PMMA. Another specimen had a couple of parallel polyimide tapes in the one side of the surface for the dielectric barriers. Each tape was pasted horizontally around center of the specimen and the interval of tapes was about 5 to 20 mm. From the experimental results, following conclusions were obtained. The dielectric barriers restrain the spreading of partial discharge on insulators surface. However, the restrain effects of barriers were weakened if the irradiating position of PD close to the dielectric barriers.
{"title":"Restrain effect of partial discharge spreading by insulator surface barriers","authors":"T. Ishida, M. Nagao","doi":"10.1109/ISEIM.2008.4664587","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664587","url":null,"abstract":"We have made researches on the internal partial discharge degradation phenomena of dielectric materials. In this paper, we investigate that the restrain effect of partial discharge spreading on the insulator surface by scratch or dielectric barriers. We prepared a few types of specimen for experiment to study the restrain effect of partial discharges on insulator. The 1 mm thick and 50 times 50 mm square plates made of polymethyl methacrylate (PMMA) were used for the experiments. One specimen had a scratch on the surface of PMMA. Another specimen had a couple of parallel polyimide tapes in the one side of the surface for the dielectric barriers. Each tape was pasted horizontally around center of the specimen and the interval of tapes was about 5 to 20 mm. From the experimental results, following conclusions were obtained. The dielectric barriers restrain the spreading of partial discharge on insulators surface. However, the restrain effects of barriers were weakened if the irradiating position of PD close to the dielectric barriers.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115403288","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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