Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254882
S. Hidaka, S. Yamashita, N. Anami, M. Otsubo, C. Honda, M. Sakae
In this paper, the examinations on the electrical characteristics and changes in insulation tube surface of the tube type creeping discharge lightning protection device were operated by large impulse current for many times are presented. A Scanning Electron Microscope (SEM) and an Electron Probe Micro Analyzer (EPMA) were used to analyze the insulation tube of the devices and the surface of the device operated by impulse current was compared with that of virgin device. In addition, the discharge characteristics of the device applied by power-frequency voltage and lightning impulse voltage were examined respectively. The surface of the tube type device changed remarkably by operating many times. On the other hand, the characteristics as lightning protection device before and after operations has not been changed so much.
{"title":"Lightning protection characteristics and changes in insulation tube surface of the tube type creeping discharge lightning protection devices","authors":"S. Hidaka, S. Yamashita, N. Anami, M. Otsubo, C. Honda, M. Sakae","doi":"10.1109/CEIDP.2003.1254882","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254882","url":null,"abstract":"In this paper, the examinations on the electrical characteristics and changes in insulation tube surface of the tube type creeping discharge lightning protection device were operated by large impulse current for many times are presented. A Scanning Electron Microscope (SEM) and an Electron Probe Micro Analyzer (EPMA) were used to analyze the insulation tube of the devices and the surface of the device operated by impulse current was compared with that of virgin device. In addition, the discharge characteristics of the device applied by power-frequency voltage and lightning impulse voltage were examined respectively. The surface of the tube type device changed remarkably by operating many times. On the other hand, the characteristics as lightning protection device before and after operations has not been changed so much.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122987304","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 : 2003-10-19DOI: 10.1109/CEIDP.2003.1254842
N. Didon, S. Agnel, J. Castellon, A. Toureille, J. Matallana, H. Janah, P. Mirebeau, R. Coelho, S. Malrieu
The Thermal Step Method (TSM) has been used recently to measure the space charge distribution in stressed insulating samples (i.e. under applied dc field or temperature). After poling the sample in order to establish the space charge, the high voltage (HV) source must be disconnected, and the TSM signal yields the space charge distribution within the sample provided its surface potential remains nearly constant during the measurement. Since it actually varies, the technique used to derive the space charge distribution from the TSM signal may yield inaccurate results. This problem should be solved by using the new improved technique described in this article.
{"title":"In-situ measurement of space-charge distribution in highly stressed samples","authors":"N. Didon, S. Agnel, J. Castellon, A. Toureille, J. Matallana, H. Janah, P. Mirebeau, R. Coelho, S. Malrieu","doi":"10.1109/CEIDP.2003.1254842","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254842","url":null,"abstract":"The Thermal Step Method (TSM) has been used recently to measure the space charge distribution in stressed insulating samples (i.e. under applied dc field or temperature). After poling the sample in order to establish the space charge, the high voltage (HV) source must be disconnected, and the TSM signal yields the space charge distribution within the sample provided its surface potential remains nearly constant during the measurement. Since it actually varies, the technique used to derive the space charge distribution from the TSM signal may yield inaccurate results. This problem should be solved by using the new improved technique described in this article.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121921860","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 : 2003-10-19DOI: 10.1109/CEIDP.2003.1254869
A. Mohammed, Raji Sundararajan
This paper presents a novel approach to estimate the life expectancy of polymeric arresters aged under accelerated multistress conditions simulating Florida environment. This is based on a multiple regression model that uses the FTIR peak height variations of the filler material of the polymeric arrester over the 15 year aging period. The method for the estimation of life is to find out the type of distribution that the peak heights of the filler material follows and determine valid parameters for that distribution. Using this a probability function is obtained to estimate the time for failure. In the present case, a Weibull distribution was obtained from the probability plot and a half-life of 19.5 years was estimated. This is in line with the expected life of polymeric materials used for high voltage outdoor insulation verifying the validity of the model.
{"title":"Investigation of breakdown of an EPSB polymeric arrester based on the life estimation using a multiple regression model","authors":"A. Mohammed, Raji Sundararajan","doi":"10.1109/CEIDP.2003.1254869","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254869","url":null,"abstract":"This paper presents a novel approach to estimate the life expectancy of polymeric arresters aged under accelerated multistress conditions simulating Florida environment. This is based on a multiple regression model that uses the FTIR peak height variations of the filler material of the polymeric arrester over the 15 year aging period. The method for the estimation of life is to find out the type of distribution that the peak heights of the filler material follows and determine valid parameters for that distribution. Using this a probability function is obtained to estimate the time for failure. In the present case, a Weibull distribution was obtained from the probability plot and a half-life of 19.5 years was estimated. This is in line with the expected life of polymeric materials used for high voltage outdoor insulation verifying the validity of the model.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117289967","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 : 2003-10-19DOI: 10.1109/CEIDP.2003.1254947
A. Beroual, J. Fleszyński
This work reports on the influence of electrodes coating with thin layers of different materials, on the initiation and development of the electroconvection. The investigations are achieved with a sphere-plane electrode system of aluminum. The considered oil samples are fresh and aged ones. The thin layers are deposits of polytetrafluoroethylene, silicon oxide and silicon nitride, obtained by magnetron sputtering. It shown that the nature of coating materials as well as the geometry and polarity of the electrodes greatly influence the threshold electroconvection voltage (i.e., the voltage required to set the liquid in motion). The effect is more marked when both electrodes are coated; the influence of polarity is more significant with fresh oils than with aged ones. At high voltages, the liquid motion is slower and the laminar character of streaming persists within a wide interval of voltages than in the case of uncoated electrodes.
{"title":"Influence of electrodes coating on the initiation and development of electroconvection in transformer oils","authors":"A. Beroual, J. Fleszyński","doi":"10.1109/CEIDP.2003.1254947","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254947","url":null,"abstract":"This work reports on the influence of electrodes coating with thin layers of different materials, on the initiation and development of the electroconvection. The investigations are achieved with a sphere-plane electrode system of aluminum. The considered oil samples are fresh and aged ones. The thin layers are deposits of polytetrafluoroethylene, silicon oxide and silicon nitride, obtained by magnetron sputtering. It shown that the nature of coating materials as well as the geometry and polarity of the electrodes greatly influence the threshold electroconvection voltage (i.e., the voltage required to set the liquid in motion). The effect is more marked when both electrodes are coated; the influence of polarity is more significant with fresh oils than with aged ones. At high voltages, the liquid motion is slower and the laminar character of streaming persists within a wide interval of voltages than in the case of uncoated electrodes.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129256257","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 : 2003-10-19DOI: 10.1109/CEIDP.2003.1254817
O. Hassan, H. Borsi, E. Gockenbach, E.M. Aboelzahab, M. Gilany
The insulation system of power transformers consists of oil and cellulose, whose dielectric properties are strongly influenced by moisture, temperature and aging. Their condition can therefore, be evaluated using dielectric response measurements. This paper describes the return voltage measurement (RVM) diagnostic method based on scanning the polarisation spectra of the oil-paper insulation in the time range of 0.1s to 1200s and excitation voltage 500V (DC). The effects of moisture, temperature and aging were studied. The accelerated aging process of oil-paper samples were investigated under air environment up to a temperature of 115/spl deg/C. Typical transformer proportions of copper, aluminium, zinc and iron were added to oil-paper insulation during the aging process. The oil-paper insulation samples were aged at different aging times at 250, 500, 1000 and 2000 hours. The investigations of temperature influence on the return voltage characteristics were studied to determine the state of the insulation under operating condition at different operating temperature from 24 to 65/spl deg/C. The RVM spectra were evaluated in terms of peak magnitude variation and time shift of peak occurrence in relation to the temperature and moisture condition as well as aging.
{"title":"Diagnostic of insulation condition of oil impregnated paper insulation systems with return voltage measurements","authors":"O. Hassan, H. Borsi, E. Gockenbach, E.M. Aboelzahab, M. Gilany","doi":"10.1109/CEIDP.2003.1254817","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254817","url":null,"abstract":"The insulation system of power transformers consists of oil and cellulose, whose dielectric properties are strongly influenced by moisture, temperature and aging. Their condition can therefore, be evaluated using dielectric response measurements. This paper describes the return voltage measurement (RVM) diagnostic method based on scanning the polarisation spectra of the oil-paper insulation in the time range of 0.1s to 1200s and excitation voltage 500V (DC). The effects of moisture, temperature and aging were studied. The accelerated aging process of oil-paper samples were investigated under air environment up to a temperature of 115/spl deg/C. Typical transformer proportions of copper, aluminium, zinc and iron were added to oil-paper insulation during the aging process. The oil-paper insulation samples were aged at different aging times at 250, 500, 1000 and 2000 hours. The investigations of temperature influence on the return voltage characteristics were studied to determine the state of the insulation under operating condition at different operating temperature from 24 to 65/spl deg/C. The RVM spectra were evaluated in terms of peak magnitude variation and time shift of peak occurrence in relation to the temperature and moisture condition as well as aging.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114335819","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 : 2003-10-19DOI: 10.1109/CEIDP.2003.1254959
J. Baker-Jarvis
The author studies the origins of the applied, macroscopic, and local electromagnetic fields by a statistical-mechanical method. In order to obtain the macroscopic fields from the microscopic fields he uses a relevant statistical-density function for ensemble averaging. He presents novel equations for the time-dependent local fields as functions of the applied field, polarization, and macroscopic field.
{"title":"Projection-operator based statistical mechanical theory of local and macroscopic electromagnetic fields","authors":"J. Baker-Jarvis","doi":"10.1109/CEIDP.2003.1254959","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254959","url":null,"abstract":"The author studies the origins of the applied, macroscopic, and local electromagnetic fields by a statistical-mechanical method. In order to obtain the macroscopic fields from the microscopic fields he uses a relevant statistical-density function for ensemble averaging. He presents novel equations for the time-dependent local fields as functions of the applied field, polarization, and macroscopic field.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124190292","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 : 2003-10-19DOI: 10.1109/CEIDP.2003.1254796
J.K. Park, B. Kim, D.C. Lee
In this study, heat and discharge treatments are arbitrary simulated for finding out the initiations and processes of surface degradation on the surface of polymer for using PCB substrate. Thermal-treatment changed the surface to the hydrophobic one with the increase of contact angle and surface potential decay respectively. In XPS spectrum to analyze surface chemical structures, the increased hydrophobicity in thermal treatment was originated from the continuous decrease of side-chains caused by oxygen groups and the increase of unsaturated double bond in carbon chains. In the chemical change of discharge treatment, a lot of side-chains comprising carboxyl radical occurred on the treated surface and the hydrophilicity increased as time elapsed.
{"title":"Surface degradation properties of the polymer composite","authors":"J.K. Park, B. Kim, D.C. Lee","doi":"10.1109/CEIDP.2003.1254796","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254796","url":null,"abstract":"In this study, heat and discharge treatments are arbitrary simulated for finding out the initiations and processes of surface degradation on the surface of polymer for using PCB substrate. Thermal-treatment changed the surface to the hydrophobic one with the increase of contact angle and surface potential decay respectively. In XPS spectrum to analyze surface chemical structures, the increased hydrophobicity in thermal treatment was originated from the continuous decrease of side-chains caused by oxygen groups and the increase of unsaturated double bond in carbon chains. In the chemical change of discharge treatment, a lot of side-chains comprising carboxyl radical occurred on the treated surface and the hydrophilicity increased as time elapsed.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127875867","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 : 2003-10-19DOI: 10.1109/CEIDP.2003.1254791
Y. Shiji, N. Shimizu
Bamboo is characterized by its excellent elasticity, split property and water absorption property. We consider that bamboo-ice composite system can be used electrical insulating system at cryogenic region. In this paper we will discuss relation between electrical insulating properties of bamboo-ice composite system and the structure of bamboo. Ac breakdown strength of bamboo-ice composite system increases with increasing water content. The vessel in bamboo is a Weak point for electrical breakdown. We consider that ac breakdown strength increases when the vessel is filled with ice. Position and shape of breakdown path is strongly influenced by existence of water. In this paper we will also discuss effect of ion in water on breakdown characteristics of bamboo-ice composite system at low temperature. Bamboo immersed with distilled water shows higher ac breakdown strength than that immersed with tap water does. Ions in water may play some role in ac breakdown process.
{"title":"Electrical insulating properties of bamboo-ice composite system at low temperature","authors":"Y. Shiji, N. Shimizu","doi":"10.1109/CEIDP.2003.1254791","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254791","url":null,"abstract":"Bamboo is characterized by its excellent elasticity, split property and water absorption property. We consider that bamboo-ice composite system can be used electrical insulating system at cryogenic region. In this paper we will discuss relation between electrical insulating properties of bamboo-ice composite system and the structure of bamboo. Ac breakdown strength of bamboo-ice composite system increases with increasing water content. The vessel in bamboo is a Weak point for electrical breakdown. We consider that ac breakdown strength increases when the vessel is filled with ice. Position and shape of breakdown path is strongly influenced by existence of water. In this paper we will also discuss effect of ion in water on breakdown characteristics of bamboo-ice composite system at low temperature. Bamboo immersed with distilled water shows higher ac breakdown strength than that immersed with tap water does. Ions in water may play some role in ac breakdown process.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122053877","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 : 2003-10-19DOI: 10.1109/CEIDP.2003.1254928
F. Gustavino, E. Torrello, M. di Lorenzo del Casale, L. Egiziano
Adopting PWM-like voltage waves, the insulation systems of stator windings of medium voltage motors have been characterized in presence and in absence of partial discharges. In addition, the dielectric losses increase for similar test samples, stressed both by a quasi square voltage and by a sinusoidal voltage, have been evaluated and reported.
{"title":"Voltage distortion effects on insulation systems behaviour in ASD motors","authors":"F. Gustavino, E. Torrello, M. di Lorenzo del Casale, L. Egiziano","doi":"10.1109/CEIDP.2003.1254928","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254928","url":null,"abstract":"Adopting PWM-like voltage waves, the insulation systems of stator windings of medium voltage motors have been characterized in presence and in absence of partial discharges. In addition, the dielectric losses increase for similar test samples, stressed both by a quasi square voltage and by a sinusoidal voltage, have been evaluated and reported.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127974440","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 : 2003-10-19DOI: 10.1109/CEIDP.2003.1254880
P. Calva, É. Ruiz, M.G. Marquez, G.P. Cabrera
Experimental results and analysis about the behavior of ethylene propylene diene monomer (EPDM) class 15 kV type suspension insulators exposed to an acid environment and an altitude of 2240 masl are reported. An aqueous solution with the principals ions present in the most acid rain registered in the Valley of Mexico was used. The fog clean method developed for non ceramic insulators (IEC-507) was utilized, but with the difference in the manner of applying the pollutant mixture on the surface of insulators. For evaluate the loss of hydrophobicity the technique of contact angle was used. The flashover voltages and the behavior of accumulated charge are analyzed. The results show a strong reduction of the hydrophobicity on insulators previously exposed to acid rain.
{"title":"Measuring and analysis of the effect of acid rain in polluted polymer insulators at high altitude","authors":"P. Calva, É. Ruiz, M.G. Marquez, G.P. Cabrera","doi":"10.1109/CEIDP.2003.1254880","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254880","url":null,"abstract":"Experimental results and analysis about the behavior of ethylene propylene diene monomer (EPDM) class 15 kV type suspension insulators exposed to an acid environment and an altitude of 2240 masl are reported. An aqueous solution with the principals ions present in the most acid rain registered in the Valley of Mexico was used. The fog clean method developed for non ceramic insulators (IEC-507) was utilized, but with the difference in the manner of applying the pollutant mixture on the surface of insulators. For evaluate the loss of hydrophobicity the technique of contact angle was used. The flashover voltages and the behavior of accumulated charge are analyzed. The results show a strong reduction of the hydrophobicity on insulators previously exposed to acid rain.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130132806","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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