Pub Date : 1998-06-22DOI: 10.1109/ICSD.1998.709330
M. Kando
This paper describes a newly developed nanosecond pulse generator in order to make tests for degradation in dielectrics, fault detection, breakdown voltage in gases, so on, and result of breakdown voltage on an enameled wire under a proposed testing method.
{"title":"A new testing method of an enameled wire with a developed nanosecond pulse generator","authors":"M. Kando","doi":"10.1109/ICSD.1998.709330","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709330","url":null,"abstract":"This paper describes a newly developed nanosecond pulse generator in order to make tests for degradation in dielectrics, fault detection, breakdown voltage in gases, so on, and result of breakdown voltage on an enameled wire under a proposed testing method.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"28 1","pages":"485-488"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85437292","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 : 1998-06-22DOI: 10.1109/ICSD.1998.709218
T. Tanaka, M. Uchiumi
Some theoretical consideration is given for voltage-induced interfacial space charge in several laminated dielectrics which was measured by the laser induced pressure pulse (LIPP) method and the pulsed electroacoustic (PEA) method. A low density polyethylene sheet was laminated by several kinds of materials such as ethylene vinyl acetate, ethylene propylene copolymers, ethylene propylene-diene terpolymers with the diene components of dicyclospentadiene and ethylenepropylene diene terpolymers with 5-ethylidene-2-norbornene. Interfacial space charge formed in such dielectrics by application of dc voltage and its decay process are evaluated and analyzed in term of permittivity and electrical conductivity of the materials used. Two or three decay time constants are obtained for each of the laminates and are correlated with the electrical and dielectric properties of the dielectrics used.
{"title":"Some consideration of voltage-induced interfacial space charge in several laminated dielectrics","authors":"T. Tanaka, M. Uchiumi","doi":"10.1109/ICSD.1998.709218","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709218","url":null,"abstract":"Some theoretical consideration is given for voltage-induced interfacial space charge in several laminated dielectrics which was measured by the laser induced pressure pulse (LIPP) method and the pulsed electroacoustic (PEA) method. A low density polyethylene sheet was laminated by several kinds of materials such as ethylene vinyl acetate, ethylene propylene copolymers, ethylene propylene-diene terpolymers with the diene components of dicyclospentadiene and ethylenepropylene diene terpolymers with 5-ethylidene-2-norbornene. Interfacial space charge formed in such dielectrics by application of dc voltage and its decay process are evaluated and analyzed in term of permittivity and electrical conductivity of the materials used. Two or three decay time constants are obtained for each of the laminates and are correlated with the electrical and dielectric properties of the dielectrics used.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"30 1","pages":"23-27"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84068010","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 : 1998-06-22DOI: 10.1109/ICSD.1998.709311
M. Darveniza, T. Saha
Extensive studies have been made of surface flashovers on varistor blocks using multipulse (MP) currents which simulate multiple stroke lightning ground flashes. The MP results are compared with those obtained with single-pulse (SP) currents and with high temporary overvoltages (TOV) at 50 Hz. The blocks used were mostly of 5 kA rating as commonly used in distribution surge arresters. MP can cause flashovers not evident with standard SP tests; they are very dependent on the quality of the dielectric on the surface and are independent of the surrounding gas.
{"title":"Surface flashovers on metal-oxide varistor blocks","authors":"M. Darveniza, T. Saha","doi":"10.1109/ICSD.1998.709311","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709311","url":null,"abstract":"Extensive studies have been made of surface flashovers on varistor blocks using multipulse (MP) currents which simulate multiple stroke lightning ground flashes. The MP results are compared with those obtained with single-pulse (SP) currents and with high temporary overvoltages (TOV) at 50 Hz. The blocks used were mostly of 5 kA rating as commonly used in distribution surge arresters. MP can cause flashovers not evident with standard SP tests; they are very dependent on the quality of the dielectric on the surface and are independent of the surrounding gas.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"7 1","pages":"406-409"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78551893","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 : 1998-06-22DOI: 10.1109/ICSD.1998.709269
E. Motyl
In this work steady-state conduction currents in two-side metallized polyimide (PI) Kapton HN samples, as well the one-side metallized samples subjected to positive and negative corona were measured at temperatures ranging from 490 K to room temperature and in fields from 2 to 120 MV/m. Also experiments were carried out upon thermally stimulated currents and space charge distribution in samples after charging.
{"title":"Electrode effects and electrical conduction in polyimide Kapton HN films","authors":"E. Motyl","doi":"10.1109/ICSD.1998.709269","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709269","url":null,"abstract":"In this work steady-state conduction currents in two-side metallized polyimide (PI) Kapton HN samples, as well the one-side metallized samples subjected to positive and negative corona were measured at temperatures ranging from 490 K to room temperature and in fields from 2 to 120 MV/m. Also experiments were carried out upon thermally stimulated currents and space charge distribution in samples after charging.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"73 1","pages":"237-240"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77778973","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 : 1998-06-22DOI: 10.1109/ICSD.1998.709322
U. Andres, I. Timoshkin
Disintegration tests with specimens of yellow sandstone showed that there exists an optimum amount of energy, which in electrical field in excess of the dielectric strength at solids, produces disintegration of material with minimum of energy per unit volume of the solids. This optimum energy absorbs during the one half of the pulse wave and generates the electrical breakdown and the mechanical disintegration of solids. The position of path of the discharge in solid-liquid system depends on electrical and mechanical parameters of the liquid-solid system.
{"title":"Energy consumption at electrical disintegration of brittle solids","authors":"U. Andres, I. Timoshkin","doi":"10.1109/ICSD.1998.709322","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709322","url":null,"abstract":"Disintegration tests with specimens of yellow sandstone showed that there exists an optimum amount of energy, which in electrical field in excess of the dielectric strength at solids, produces disintegration of material with minimum of energy per unit volume of the solids. This optimum energy absorbs during the one half of the pulse wave and generates the electrical breakdown and the mechanical disintegration of solids. The position of path of the discharge in solid-liquid system depends on electrical and mechanical parameters of the liquid-solid system.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"89 5 1","pages":"452-455"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83334052","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 : 1998-06-22DOI: 10.1109/ICSD.1998.709282
G. Teyssèdre, D. Mary, L. Cissé, C. Laurent, J. Salon
In this work we have used an aromatic polyester, Poly(ethylene 2,6-naphthalate) for investigating the long term behaviour under constant dc field. Current and electroluminescence (EL) have been followed as a function of time for up to 10/sup 6/ s for applied dc field higher than 3 MV/cm. Simultaneously, wavelength resolved emission spectra have been recorded. The spectral evolution of EL as a function of time is discussed.
{"title":"Dependence of electroluminescence intensity and spectral distribution on ageing time in polyethylene naphthalate","authors":"G. Teyssèdre, D. Mary, L. Cissé, C. Laurent, J. Salon","doi":"10.1109/ICSD.1998.709282","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709282","url":null,"abstract":"In this work we have used an aromatic polyester, Poly(ethylene 2,6-naphthalate) for investigating the long term behaviour under constant dc field. Current and electroluminescence (EL) have been followed as a function of time for up to 10/sup 6/ s for applied dc field higher than 3 MV/cm. Simultaneously, wavelength resolved emission spectra have been recorded. The spectral evolution of EL as a function of time is discussed.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"26 1","pages":"287-290"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88756559","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 : 1998-06-22DOI: 10.1109/ICSD.1998.709281
Hongyu Wang, R. Busch
Summary form only given. In the research of thermal stress performance as well as aging phenomena and properties of insulating materials and systems for electrical machine the controlling accuracy of the thermal stress intensity (the aging temperature) exercises immediately an influence on the precision of the researching results. Such as the statements in another paper, some deviation and error that occurred in the conclusion of many aging tests and studies were just caused by the inaccurate control of thermal stress intensity. A practical experimental method with high accuracy and reliability for research of thermal aging properties in winding insulating systems has been developed in this works in consideration of the distinction between thermal aging and thermal breakdown in the thermal aging process. By means of this method the aging phenomena and performance of the tested winding insulating systems can be accurately observed, measured, and analyzed in various aging phases or periods, so that these experimental data will provide reliable scientific basis not only for the improvement, of the insulating systems design but also for the fault detection and fault prognosis in the applications. There are many experimental techniques, which are used in this method, such as SPS, sensor-technique, signal-feedback-control, reverse-driving, PC-monitoring, EDP system and etc. The test winding insulating systems aged practically at the complete stresses that include the accurate control of thermal stresses (deviations: /spl plusmn/1/spl deg/C) in a specially developed driving-stand. The experimental results provided with lots of reliable and accurate data for research of thermal aging properties in winding insulating systems and verified the necessity of the distinction between thermal aging and thermal breakdown in the meantime.
{"title":"A practical experimental method with high accuracy for research of thermal aging properties in winding insulating systems","authors":"Hongyu Wang, R. Busch","doi":"10.1109/ICSD.1998.709281","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709281","url":null,"abstract":"Summary form only given. In the research of thermal stress performance as well as aging phenomena and properties of insulating materials and systems for electrical machine the controlling accuracy of the thermal stress intensity (the aging temperature) exercises immediately an influence on the precision of the researching results. Such as the statements in another paper, some deviation and error that occurred in the conclusion of many aging tests and studies were just caused by the inaccurate control of thermal stress intensity. A practical experimental method with high accuracy and reliability for research of thermal aging properties in winding insulating systems has been developed in this works in consideration of the distinction between thermal aging and thermal breakdown in the thermal aging process. By means of this method the aging phenomena and performance of the tested winding insulating systems can be accurately observed, measured, and analyzed in various aging phases or periods, so that these experimental data will provide reliable scientific basis not only for the improvement, of the insulating systems design but also for the fault detection and fault prognosis in the applications. There are many experimental techniques, which are used in this method, such as SPS, sensor-technique, signal-feedback-control, reverse-driving, PC-monitoring, EDP system and etc. The test winding insulating systems aged practically at the complete stresses that include the accurate control of thermal stresses (deviations: /spl plusmn/1/spl deg/C) in a specially developed driving-stand. The experimental results provided with lots of reliable and accurate data for research of thermal aging properties in winding insulating systems and verified the necessity of the distinction between thermal aging and thermal breakdown in the meantime.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"190 1","pages":"286-"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76939790","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 : 1998-06-22DOI: 10.1109/ICSD.1998.709256
G. Rabach, A. Contin, F. Razza, M. Visintin
The paper deals with the results of investigations performed in order to verify whether diagnostic tests, based on Partial Discharge Height Distribution (PDHD) analysis, are able to identify the causes of deterioration and to guide the repair of the insulation system of HV rotating machine stator windings. The insulation system of a turbogenerator was tested after a breakdown occurred in service. Partial Discharge (PD) measurements were performed both on the windings and on single coils. The analysis of the results of PD measurements evidenced that the breakdown was due to a defective impregnation of the winding.
{"title":"On turbogenerator H.V. stator winding condition assessment by the analysis of PDHD detected on phases and insulated coils after untimely failure","authors":"G. Rabach, A. Contin, F. Razza, M. Visintin","doi":"10.1109/ICSD.1998.709256","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709256","url":null,"abstract":"The paper deals with the results of investigations performed in order to verify whether diagnostic tests, based on Partial Discharge Height Distribution (PDHD) analysis, are able to identify the causes of deterioration and to guide the repair of the insulation system of HV rotating machine stator windings. The insulation system of a turbogenerator was tested after a breakdown occurred in service. Partial Discharge (PD) measurements were performed both on the windings and on single coils. The analysis of the results of PD measurements evidenced that the breakdown was due to a defective impregnation of the winding.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"206 1","pages":"185-188"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77897968","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 : 1998-06-22DOI: 10.1109/ICSD.1998.709334
L. Walfridsson, U. Fromm, A. Kron, R. Liu, L. Ming, T. Schutte, D. Windmar
In laboratory set-ups, polymer covering of the electrodes has resulted in the reduction of the insulating distances by a factor two. One of the problems with covered conductors is however that of creeping discharges on the surface of the covering. The aim of this work was to investigate how creeping discharges develop under lightning impulse (1.2/50 /spl mu/s) on two covered conductors at a 90-degree angle to each other. Furthermore, the aim was to investigate how to stop the propagation of a creeping discharge. This was achieved by inserting at least one cable termination, e.g. the type of termination used for high voltage cables, into the discharge path. The experiments showed that a set-up with two crossing cables can withstand very high voltages without any shed or termination of the creeping discharges. Further tests show a considerable increase of the breakdown voltage in other arrangements comprising covered electrodes. This was accomplished by using two cable terminations at each cable end to stop the propagation of creeping discharges.
{"title":"Solid insulation covering of conductors improves air insulation systems","authors":"L. Walfridsson, U. Fromm, A. Kron, R. Liu, L. Ming, T. Schutte, D. Windmar","doi":"10.1109/ICSD.1998.709334","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709334","url":null,"abstract":"In laboratory set-ups, polymer covering of the electrodes has resulted in the reduction of the insulating distances by a factor two. One of the problems with covered conductors is however that of creeping discharges on the surface of the covering. The aim of this work was to investigate how creeping discharges develop under lightning impulse (1.2/50 /spl mu/s) on two covered conductors at a 90-degree angle to each other. Furthermore, the aim was to investigate how to stop the propagation of a creeping discharge. This was achieved by inserting at least one cable termination, e.g. the type of termination used for high voltage cables, into the discharge path. The experiments showed that a set-up with two crossing cables can withstand very high voltages without any shed or termination of the creeping discharges. Further tests show a considerable increase of the breakdown voltage in other arrangements comprising covered electrodes. This was accomplished by using two cable terminations at each cable end to stop the propagation of creeping discharges.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"9 1","pages":"502-505"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78475588","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 : 1998-06-22DOI: 10.1109/ICSD.1998.709316
S. Sebo, J. Sakich, T. Zhao
Non-ceramic (polymer) insulators have been employed by the electric utility industry for the last three decades. The electrical and material tests for polymer insulators over the years has become more sophisticated, and their ranges have become broader. The purpose of such tests is to investigate the performance of polymer insulating materials and insulator designs, and to estimate the service life of a specific polymer insulator. One of the preferred tests is the salt fog chamber application, together with flashover tests and various material diagnostic techniques. This paper analyzes the cumulative number of leakage pulse data taken in the course of fog chamber aging tests, for both low and high salinity fog conditions.
{"title":"Evaluation of leakage current pulse data of polymer insulator aging tests","authors":"S. Sebo, J. Sakich, T. Zhao","doi":"10.1109/ICSD.1998.709316","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709316","url":null,"abstract":"Non-ceramic (polymer) insulators have been employed by the electric utility industry for the last three decades. The electrical and material tests for polymer insulators over the years has become more sophisticated, and their ranges have become broader. The purpose of such tests is to investigate the performance of polymer insulating materials and insulator designs, and to estimate the service life of a specific polymer insulator. One of the preferred tests is the salt fog chamber application, together with flashover tests and various material diagnostic techniques. This paper analyzes the cumulative number of leakage pulse data taken in the course of fog chamber aging tests, for both low and high salinity fog conditions.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"2 1","pages":"426-429"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73280641","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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