Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.414065
Y. Purushottam, R. Sumathi, K. Udayakumar, K. Dharmalingam
Insulator ribs exert an important and complex influence on the scintillation pattern and final flashover under polluted conditions. In this work a new model, named Rib-effect Simulation (RS) model, is developed to account for the rib effects. Laboratory tests for initial potential distribution pattern and dryband formation are conducted on an actual insulator and its model. The influence of location of drybands, the presence of a wet patch in a dry zone, the effects of the components of pin and ribs on the scintillation pattern is also studied and reported.<>
{"title":"Pollution studies on insulators using the Rib-effect Simulation model","authors":"Y. Purushottam, R. Sumathi, K. Udayakumar, K. Dharmalingam","doi":"10.1109/ICPADM.1994.414065","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414065","url":null,"abstract":"Insulator ribs exert an important and complex influence on the scintillation pattern and final flashover under polluted conditions. In this work a new model, named Rib-effect Simulation (RS) model, is developed to account for the rib effects. Laboratory tests for initial potential distribution pattern and dryband formation are conducted on an actual insulator and its model. The influence of location of drybands, the presence of a wet patch in a dry zone, the effects of the components of pin and ribs on the scintillation pattern is also studied and reported.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115794352","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414078
S. Moorthy, S. Shihab, X. Cheng
Partial discharge (PD) measurement has long been recognised as an important part of quality control for high voltage equipment. The electrical measurement of partial discharges, which has significantly grown in importance, is the main theme of this paper. In a research program undertaken at RMIT an alternative method using current transducers to sense the PD signal is being investigated. In particular, its applicability for on-line/on-site measurements is emphasised.<>
{"title":"Practical on-line partial discharge measuring system for high voltage apparatus","authors":"S. Moorthy, S. Shihab, X. Cheng","doi":"10.1109/ICPADM.1994.414078","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414078","url":null,"abstract":"Partial discharge (PD) measurement has long been recognised as an important part of quality control for high voltage equipment. The electrical measurement of partial discharges, which has significantly grown in importance, is the main theme of this paper. In a research program undertaken at RMIT an alternative method using current transducers to sense the PD signal is being investigated. In particular, its applicability for on-line/on-site measurements is emphasised.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115998271","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.413986
R. Ross
Aiming at making Weibull plots, three types of plotting positions are reviewed: median probability, mean probability and mean plotting position. It is important whether the (log)data are regarded as median or as mean values. Median type plotting gives a biased plot on the average and, if used to identify outliers, can be somewhat misleading at the low end of the curve. In contrast, the mean type gives unbiased estimators by linear regression estimation, thus granting the best Weibull plot on the average. For use of Weibull paper in combination with a calculator, adequate formulas approximating probabilities are discussed. A somewhat improved formula for expected plotting position is given.<>
{"title":"Graphical methods for plotting and evaluating Weibull distributed data","authors":"R. Ross","doi":"10.1109/ICPADM.1994.413986","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413986","url":null,"abstract":"Aiming at making Weibull plots, three types of plotting positions are reviewed: median probability, mean probability and mean plotting position. It is important whether the (log)data are regarded as median or as mean values. Median type plotting gives a biased plot on the average and, if used to identify outliers, can be somewhat misleading at the low end of the curve. In contrast, the mean type gives unbiased estimators by linear regression estimation, thus granting the best Weibull plot on the average. For use of Weibull paper in combination with a calculator, adequate formulas approximating probabilities are discussed. A somewhat improved formula for expected plotting position is given.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116416780","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.413946
N. Ijumba, M. Gakuru, N. Abungu
When an insulator is placed in an electrode gap, its surface charge field distorts the geometric field, leading to a flashover at a voltage value dependent on the degree of the gap field distortion. This paper reports on studies conducted to determine the relationship between flashover voltages and electric field distribution along solid insulator surfaces. The surface electric field distribution along different insulator profiles was determined using the Finite-Difference method, and the flashover of the actual profile model measured. The obtained results show that each profile had a peak surface electric field and the higher the peak value, the lower the flashover voltage. The correlation curve for peak electric field and flashover voltage was developed using a curve fitting technique based on the Nelder-Mead simplex algorithm.<>
{"title":"Application of electric field calculations in optimisation of insulator designs","authors":"N. Ijumba, M. Gakuru, N. Abungu","doi":"10.1109/ICPADM.1994.413946","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413946","url":null,"abstract":"When an insulator is placed in an electrode gap, its surface charge field distorts the geometric field, leading to a flashover at a voltage value dependent on the degree of the gap field distortion. This paper reports on studies conducted to determine the relationship between flashover voltages and electric field distribution along solid insulator surfaces. The surface electric field distribution along different insulator profiles was determined using the Finite-Difference method, and the flashover of the actual profile model measured. The obtained results show that each profile had a peak surface electric field and the higher the peak value, the lower the flashover voltage. The correlation curve for peak electric field and flashover voltage was developed using a curve fitting technique based on the Nelder-Mead simplex algorithm.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"633 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116478901","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.413930
R. Badent, K. Kist, A. Schwab
The prebreakdown behavior of insulating oil has been studied for strong non-uniform fields at gaps from 10 to 70 mm and at voltages up to 700 kV. Basically, the negative tip has the higher dielectric strength. For the positive predischarge, three consecutive stages can be observed: primary, secondary and tertiary streamers. The primary streamer shows structural variations depending on the growth rate of the electric field. Secondary and tertiary streamers appear in a coniferous branch-like and filamentary pattern. For the negative predischarge the existence of a second, faster propagation stage could be observed and optically recorded. This secondary structure originates from a frequently branched primary streamer and propagates in a less branched, filamentary fashion with significantly higher velocity.<>
{"title":"Prebreakdown phenomena in insulating oil at large gap distances","authors":"R. Badent, K. Kist, A. Schwab","doi":"10.1109/ICPADM.1994.413930","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413930","url":null,"abstract":"The prebreakdown behavior of insulating oil has been studied for strong non-uniform fields at gaps from 10 to 70 mm and at voltages up to 700 kV. Basically, the negative tip has the higher dielectric strength. For the positive predischarge, three consecutive stages can be observed: primary, secondary and tertiary streamers. The primary streamer shows structural variations depending on the growth rate of the electric field. Secondary and tertiary streamers appear in a coniferous branch-like and filamentary pattern. For the negative predischarge the existence of a second, faster propagation stage could be observed and optically recorded. This secondary structure originates from a frequently branched primary streamer and propagates in a less branched, filamentary fashion with significantly higher velocity.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130071216","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.413979
K. Lim, S. Park, S.H. Kang, S. Kim, M. Han
Digitalization in electronic systems is required with capacitors which are large capacitance with small size, low impedance at high frequency, and high reliability. The fabrication and properties of aluminium solid electrolytic capacitors are investigated. Employing a conducting polymer film such as, polypyrrole as solid electrolyte, solid type aluminium electrolytic capacitors were made. The surface of insulating oxide is covered with conducting polymer layer prepared by chemical oxidative polymerization. Thereafter this conducting layer is covered with conducting polymer prepared by electrochemical polymerization. The dielectric properties of these capacitors were also measured and discussed. Regarding the frequency characteristics of the trial capacitor, impedance and ESR at high frequency is lower than those of the stacked type film capacitor. It is also confirmed that the temperature coefficient of capacitance and dissipation factor of the capacitor is lower than that of the film capacitor and liquid type aluminium electrolytic capacitor.<>
{"title":"Dielectric properties of aluminium solid electrolytic capacitor using conduction polymer","authors":"K. Lim, S. Park, S.H. Kang, S. Kim, M. Han","doi":"10.1109/ICPADM.1994.413979","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413979","url":null,"abstract":"Digitalization in electronic systems is required with capacitors which are large capacitance with small size, low impedance at high frequency, and high reliability. The fabrication and properties of aluminium solid electrolytic capacitors are investigated. Employing a conducting polymer film such as, polypyrrole as solid electrolyte, solid type aluminium electrolytic capacitors were made. The surface of insulating oxide is covered with conducting polymer layer prepared by chemical oxidative polymerization. Thereafter this conducting layer is covered with conducting polymer prepared by electrochemical polymerization. The dielectric properties of these capacitors were also measured and discussed. Regarding the frequency characteristics of the trial capacitor, impedance and ESR at high frequency is lower than those of the stacked type film capacitor. It is also confirmed that the temperature coefficient of capacitance and dissipation factor of the capacitor is lower than that of the film capacitor and liquid type aluminium electrolytic capacitor.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130694191","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414129
E. Krause, J. Guastavino, J. Rault, R. Grob, C. Mayoux
Poly(ethylene 2, 6 naphthalene dicarboxylate) (PEN) is studied to gain more knowledge in respect to its behaviour to corona discharge activity. After discharge treatment in air, the surface of bi-axially oriented films (12 /spl mu/m) is optically analysed and unusual deposits are observed. ESCA, DMTA and dielectric loss tangent measurements allow the authors to propose a crosslinking process through radicular mechanisms to explain the evolution of the insulating material.<>
{"title":"Poly(ethylene 2,6 naphthalene dicarboxylate) ageing under electrical discharges","authors":"E. Krause, J. Guastavino, J. Rault, R. Grob, C. Mayoux","doi":"10.1109/ICPADM.1994.414129","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414129","url":null,"abstract":"Poly(ethylene 2, 6 naphthalene dicarboxylate) (PEN) is studied to gain more knowledge in respect to its behaviour to corona discharge activity. After discharge treatment in air, the surface of bi-axially oriented films (12 /spl mu/m) is optically analysed and unusual deposits are observed. ESCA, DMTA and dielectric loss tangent measurements allow the authors to propose a crosslinking process through radicular mechanisms to explain the evolution of the insulating material.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132180868","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414019
Suwarno, H. Ichikawa, Y. Suzuoki, T. Mizutani, K. Uchida
The partial discharge pattern of electrical treeing in polyethylene was investigated by using a computer aided partial discharge measurement system. It was found that partial discharge from an electrical tree is characterized by the so-called wing-like pattern. By using the wing-like patterns, treeing degradation was successfully diagnosed. It is likely that each PD from a tree occurs in a different channel and the number of discharges in each half cycle in one channel is one or less. Negative discharges occur more easily than positive ones.<>
{"title":"Partial discharge patterns of electrical treeing in polyethylene","authors":"Suwarno, H. Ichikawa, Y. Suzuoki, T. Mizutani, K. Uchida","doi":"10.1109/ICPADM.1994.414019","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414019","url":null,"abstract":"The partial discharge pattern of electrical treeing in polyethylene was investigated by using a computer aided partial discharge measurement system. It was found that partial discharge from an electrical tree is characterized by the so-called wing-like pattern. By using the wing-like patterns, treeing degradation was successfully diagnosed. It is likely that each PD from a tree occurs in a different channel and the number of discharges in each half cycle in one channel is one or less. Negative discharges occur more easily than positive ones.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132302547","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.413920
S. Itahashi, H. Mitsui, M. Sone
The dissolved water in insulating liquids influences the electrical properties of the liquids. The behavior of charge carriers depends on the water in the liquid and relates to the physical properties of the liquid. Temperature influences the physical properties of the liquids, and it is important to study the relation between the variation of effect of water on electrical phenomena of the liquids and temperature. In our study, the state of water in di-octyl-phthalate (DOP) is analyzed using the IR spectra of water measured by the FT-IR method. In this paper, the IR spectra of water in DOP is measured by the FT-IR method in the region from -50 to 120 [/spl deg/C], and the relation between the state of water in DOP and temperature is analyzed.<>
{"title":"Variation of state of water in dielectric liquids by temperature","authors":"S. Itahashi, H. Mitsui, M. Sone","doi":"10.1109/ICPADM.1994.413920","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413920","url":null,"abstract":"The dissolved water in insulating liquids influences the electrical properties of the liquids. The behavior of charge carriers depends on the water in the liquid and relates to the physical properties of the liquid. Temperature influences the physical properties of the liquids, and it is important to study the relation between the variation of effect of water on electrical phenomena of the liquids and temperature. In our study, the state of water in di-octyl-phthalate (DOP) is analyzed using the IR spectra of water measured by the FT-IR method. In this paper, the IR spectra of water in DOP is measured by the FT-IR method in the region from -50 to 120 [/spl deg/C], and the relation between the state of water in DOP and temperature is analyzed.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126442957","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.413916
Wang Shoutai, Zhao Xiangzhen, Chen Jiang
We investigated the effects of fast electron irradiation on electrical properties of tetrafluoroethylene-ethylene copolymer (F40) and measured volume resistivity /spl rho//sub V/, dielectric loss angle tg/spl delta/, permittivity /spl epsi//sub r/ and breakdown strength E/sub B/, before and after irradiation. We found that /spl rho//sub V/ and tg/spl delta/ seriously varied with radiation. /spl rho//sub V/ decreased by two orders of magnitude after irradiation, and slowly recovered with the storage time at room temperature. Howwhile, /spl epsi//sub r/ and E/sub B/ are unchanged. We think that the variation of /spl rho//sub V/ and tg/spl delta/ are due to trapped carriers and space charge in irradiated F40. Studies on radiation crosslinking of F40 have been reported, but effects of fast electron irradiation on electric properties of F40 have not yet been reported. This paper gives our results for the variations in volume resistivity /spl rho//sub V/, loss tangent tg/spl delta/, relative permittivity /spl epsi//sub r/ and dielectric breakdown strength E/sub B/ of F40 after fast electron irradiation, and the variations of irradiated F40 electrical properties with standing time at room temperature have been observed dynamically.<>
{"title":"Effects of radiation crosslinking on electrical properties of tetrafluoroethylene-ethylene copolymer","authors":"Wang Shoutai, Zhao Xiangzhen, Chen Jiang","doi":"10.1109/ICPADM.1994.413916","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413916","url":null,"abstract":"We investigated the effects of fast electron irradiation on electrical properties of tetrafluoroethylene-ethylene copolymer (F40) and measured volume resistivity /spl rho//sub V/, dielectric loss angle tg/spl delta/, permittivity /spl epsi//sub r/ and breakdown strength E/sub B/, before and after irradiation. We found that /spl rho//sub V/ and tg/spl delta/ seriously varied with radiation. /spl rho//sub V/ decreased by two orders of magnitude after irradiation, and slowly recovered with the storage time at room temperature. Howwhile, /spl epsi//sub r/ and E/sub B/ are unchanged. We think that the variation of /spl rho//sub V/ and tg/spl delta/ are due to trapped carriers and space charge in irradiated F40. Studies on radiation crosslinking of F40 have been reported, but effects of fast electron irradiation on electric properties of F40 have not yet been reported. This paper gives our results for the variations in volume resistivity /spl rho//sub V/, loss tangent tg/spl delta/, relative permittivity /spl epsi//sub r/ and dielectric breakdown strength E/sub B/ of F40 after fast electron irradiation, and the variations of irradiated F40 electrical properties with standing time at room temperature have been observed dynamically.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121613949","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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