Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.413967
R. Puflea-Ramer, A. Ramer, M. Ionescu, C. Sorrell, B. Vu, J. Cochrane
Central to microwave applications are iron garnet type materials involving rare earth elements. Most commonly they are based on Gd-Al substitutions-typically Y/sub 3-3x/Gd/sub 3x/Fe/sub 5-5y/Al/sub 5/O/sub 12/, offering wide temperature ranges of stable magnetic susceptibility, along with other desirable manufacturing characteristics. We were particularly interested in the coefficient of stability of magnetisation /spl alpha/=(4/spl pi/ M/sub max//sup S/-4/spl pi/ M/sub min//sup S/)/(4/spl pi/ M/sub 23/spl deg/C//sup S/) (/spl Delta/ T/sup -1/) and the temperature regions [T/sub 1/-T/sub 2/], /spl Delta/T=T/sub 2/-T/sub 1/ for which it is minimised. They determine their technological applications of the specific garnet materials; we established their location and /spl alpha//sub min/ for temperature ranges from 60/spl deg/ through 180/spl deg/C (in increments of 30/spl deg/C.) Extensive experimental studies of a variety of Gd-Al garnets demonstrate that all key magnetic parameters change in a liner manner as functions of Gd contents and Al contents. This suggests that the susceptibility curves (and computations) for new, yet to be synthesised Gd-Al garnets, can be generated through a suitable linear interpolation of the known compounds. We offer a computer-aided verification of this hypothesis followed by CAD of garnet type materials.<>
{"title":"Computational method on magnetic properties of microwave ferrimagnets","authors":"R. Puflea-Ramer, A. Ramer, M. Ionescu, C. Sorrell, B. Vu, J. Cochrane","doi":"10.1109/ICPADM.1994.413967","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413967","url":null,"abstract":"Central to microwave applications are iron garnet type materials involving rare earth elements. Most commonly they are based on Gd-Al substitutions-typically Y/sub 3-3x/Gd/sub 3x/Fe/sub 5-5y/Al/sub 5/O/sub 12/, offering wide temperature ranges of stable magnetic susceptibility, along with other desirable manufacturing characteristics. We were particularly interested in the coefficient of stability of magnetisation /spl alpha/=(4/spl pi/ M/sub max//sup S/-4/spl pi/ M/sub min//sup S/)/(4/spl pi/ M/sub 23/spl deg/C//sup S/) (/spl Delta/ T/sup -1/) and the temperature regions [T/sub 1/-T/sub 2/], /spl Delta/T=T/sub 2/-T/sub 1/ for which it is minimised. They determine their technological applications of the specific garnet materials; we established their location and /spl alpha//sub min/ for temperature ranges from 60/spl deg/ through 180/spl deg/C (in increments of 30/spl deg/C.) Extensive experimental studies of a variety of Gd-Al garnets demonstrate that all key magnetic parameters change in a liner manner as functions of Gd contents and Al contents. This suggests that the susceptibility curves (and computations) for new, yet to be synthesised Gd-Al garnets, can be generated through a suitable linear interpolation of the known compounds. We offer a computer-aided verification of this hypothesis followed by CAD of garnet type materials.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"108 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":"122545778","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.1994.414020
H. Kon, Y. Suzuoki, T. Mizutani, T. Suzuki
By utilizing the laser-induced-pressure-pulse technique, the combined effect of antioxidant and oxidation degradation was investigated. In LDPE with antioxidant, conduction current increases in the low oxidation region (/spl alpha/<3 cm/sup -1/), and decreases in the high oxidation region (/spl alpha/>3 cm/sup -1/) And as the degree of oxidation increases, remarkable homo space charge is formed. The introduction of the layer of degraded antioxidant on unoxidized PE enhances carrier injection into PE and leads to remarkable hetero space-charge formation. The introduction of the same layer on oxidized PE reduces carrier injection into PE and leads to small homo space-charge formation. These explain the dependence of the conduction and space-charge behavior on oxidation in LDPE with antioxidant.<>
{"title":"Study of space-charge behavior in polyethylene for cable insulation by laser-induced-pressure-pulse technique","authors":"H. Kon, Y. Suzuoki, T. Mizutani, T. Suzuki","doi":"10.1109/ICPADM.1994.414020","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414020","url":null,"abstract":"By utilizing the laser-induced-pressure-pulse technique, the combined effect of antioxidant and oxidation degradation was investigated. In LDPE with antioxidant, conduction current increases in the low oxidation region (/spl alpha/<3 cm/sup -1/), and decreases in the high oxidation region (/spl alpha/>3 cm/sup -1/) And as the degree of oxidation increases, remarkable homo space charge is formed. The introduction of the layer of degraded antioxidant on unoxidized PE enhances carrier injection into PE and leads to remarkable hetero space-charge formation. The introduction of the same layer on oxidized PE reduces carrier injection into PE and leads to small homo space-charge formation. These explain the dependence of the conduction and space-charge behavior on oxidation in LDPE with antioxidant.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"15 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":"122960834","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.1994.414157
Russel K Binggeli, D. Birtwhistle, Ken Millars
In this paper the authors examine the main limiting stresses on the LV ABC (aerial bundle cable) system and identify desirable characteristics of the polymeric materials. It has been established that properties of polymeric parts of low voltage ABC play an important part in the performance of the system. Problems identified in the performance of materials are: (i) limitation of mechanical strength of ABC lines due to poor adhesion of XLPE to the aluminium conductor; (ii) loss of good electrical contact between connectors and cable strands due to relaxation of insulation piercing connector (IPC) bodies; and (iii) moisture ingress to the cable conductors at the point where the IPC teeth puncture the insulation due to inadequate moisture sealing. The above problems have lead to the identification of some of the necessary characteristics of the polymeric materials to be used in ABC systems.<>
{"title":"Insulating properties limiting performance of low voltage aerial bundled cable reticulation systems","authors":"Russel K Binggeli, D. Birtwhistle, Ken Millars","doi":"10.1109/ICPADM.1994.414157","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414157","url":null,"abstract":"In this paper the authors examine the main limiting stresses on the LV ABC (aerial bundle cable) system and identify desirable characteristics of the polymeric materials. It has been established that properties of polymeric parts of low voltage ABC play an important part in the performance of the system. Problems identified in the performance of materials are: (i) limitation of mechanical strength of ABC lines due to poor adhesion of XLPE to the aluminium conductor; (ii) loss of good electrical contact between connectors and cable strands due to relaxation of insulation piercing connector (IPC) bodies; and (iii) moisture ingress to the cable conductors at the point where the IPC teeth puncture the insulation due to inadequate moisture sealing. The above problems have lead to the identification of some of the necessary characteristics of the polymeric materials to be used in ABC systems.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"10 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":"114152079","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.1994.414127
M. Darveniza, D. Hill, T. Le, T. Saha, B. Williams
In this paper some results of a study of the physical and chemical properties of new Kraft insulation paper and paper retrieved from a retired transformer are presented. These results have been compared with those found for a series of experiments in which new insulation paper was artificially aged at elevated temperatures. Molecular weight studies on the cellulosic components of the paper following artificial ageing have allowed the rate constant for chain scission to be calculated for a range of degradation temperatures. An Arrhenius analysis of these rate parameters yielded an activation energy for chain scission of 79.5 kJ mol/sup -1/. These data have been used to prepare lifetime prediction curves for transformer insulation at the typical operational temperatures of power transformers.<>
{"title":"Chemical degradation of cellulosic insulation paper for power transformers","authors":"M. Darveniza, D. Hill, T. Le, T. Saha, B. Williams","doi":"10.1109/ICPADM.1994.414127","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414127","url":null,"abstract":"In this paper some results of a study of the physical and chemical properties of new Kraft insulation paper and paper retrieved from a retired transformer are presented. These results have been compared with those found for a series of experiments in which new insulation paper was artificially aged at elevated temperatures. Molecular weight studies on the cellulosic components of the paper following artificial ageing have allowed the rate constant for chain scission to be calculated for a range of degradation temperatures. An Arrhenius analysis of these rate parameters yielded an activation energy for chain scission of 79.5 kJ mol/sup -1/. These data have been used to prepare lifetime prediction curves for transformer insulation at the typical operational temperatures of power transformers.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"26 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":"124957113","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.1994.414118
M. Darveniza, T. Saha, D. Hill, T. Le
The paper addresses the assessment of insulation condition in distribution transformers. Electrical diagnostic techniques have been applied to several distribution transformers of different ages and ratings. Correlation between dissipation factor and interfacial polarization spectra (IFS) parameters are examined. Gel permeation chromatography (GPC) has been used for observing the change in molecular weight of the cellulose polymer. The correlation between interfacial polarization parameters and peak molecular weights are also examined.<>
{"title":"Condition monitoring of the bulk insulation of distribution transformers by electrical and chemical techniques","authors":"M. Darveniza, T. Saha, D. Hill, T. Le","doi":"10.1109/ICPADM.1994.414118","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414118","url":null,"abstract":"The paper addresses the assessment of insulation condition in distribution transformers. Electrical diagnostic techniques have been applied to several distribution transformers of different ages and ratings. Correlation between dissipation factor and interfacial polarization spectra (IFS) parameters are examined. Gel permeation chromatography (GPC) has been used for observing the change in molecular weight of the cellulose polymer. The correlation between interfacial polarization parameters and peak molecular weights are also examined.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"26 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":"122530256","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.1994.413994
I. Kitani, K. Yamauchi, S. Nishimoto, K. Arii
The charge spreading phenomena on polymeric insulating films from a circular evaporated electrode were studied in the atmospheres of air and nitrogen gas atmospheres on the application of a slowly increasing dc ramp voltage. The flash over voltage between the circular and its opposing concentric ring electrodes on the film was also measured. The observation on very faint light using an image intensifier camera revealed that micro discharges occurred repeatedly at the surrounding region of the circular electrode as the voltage increased. When the positive voltage was applied to the circular electrode, several or more streamer-like micro discharges occurred in a row at the same time in both atmospheres. In the negative polarity, a single fan-shaped micro discharge occurred at a time in air and luminous regions were observed as one or a few small spots at the electrode edge in nitrogen gas. The electrons created by the negative micro discharges in nitrogen gas had a major role of the expansion of charging region. The flash over voltage in air was higher than that in nitrogen gas in both polarities; more remarkable difference in the flash over voltage was obtained in the negative polarity. The voltage for the negative polarity was much higher than that for the positive polarity in air, while the former was rather slightly lower than the latter in nitrogen gas.<>
{"title":"The charge spreading due to micro discharges on insulating films from an evaporated metal electrode subjected to a DC ramp voltage","authors":"I. Kitani, K. Yamauchi, S. Nishimoto, K. Arii","doi":"10.1109/ICPADM.1994.413994","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413994","url":null,"abstract":"The charge spreading phenomena on polymeric insulating films from a circular evaporated electrode were studied in the atmospheres of air and nitrogen gas atmospheres on the application of a slowly increasing dc ramp voltage. The flash over voltage between the circular and its opposing concentric ring electrodes on the film was also measured. The observation on very faint light using an image intensifier camera revealed that micro discharges occurred repeatedly at the surrounding region of the circular electrode as the voltage increased. When the positive voltage was applied to the circular electrode, several or more streamer-like micro discharges occurred in a row at the same time in both atmospheres. In the negative polarity, a single fan-shaped micro discharge occurred at a time in air and luminous regions were observed as one or a few small spots at the electrode edge in nitrogen gas. The electrons created by the negative micro discharges in nitrogen gas had a major role of the expansion of charging region. The flash over voltage in air was higher than that in nitrogen gas in both polarities; more remarkable difference in the flash over voltage was obtained in the negative polarity. The voltage for the negative polarity was much higher than that for the positive polarity in air, while the former was rather slightly lower than the latter in nitrogen gas.<<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":"115155837","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.1994.414091
R. Badent, K. Kist, N. Lewald, A. Schwab
The new diagnosis method employs a classical PD measurement system consisting of a coupling capacitor, measuring impedance, and a "wideband" integrator, cascaded by an artificial network evaluation. Upon passing a polarity detection unit, the output signal of the "wideband" integrator is recorded via a digital storage oscilloscope which simultaneously serves as an interface to the subsequent computer-aided evaluation. The personal computer stores the PD-values in a phase resolving PD-matrix. After sufficient learning with training matrices the system recognizes different fault types with high probability. The recognition likelihood of trained patterns is almost 100 percent and of a new pattern approximately 90 percent, depending on both the number of training matrices and the repetition rate. The implemented artificial neural network is composed of a three layer backpropagation algorithm with threshold units and a recognition volume of up to 16 fault types. To guarantee the highest individual detection rate, each fault type must be trained with the same number of matrices. Thereafter, the network is able to recognize previously learned fault types without any other data pre- or post-processing, i.e. the diagnosis system relies exclusively on pattern recognition.<>
{"title":"Partial-discharge diagnosis with artificial neural networks","authors":"R. Badent, K. Kist, N. Lewald, A. Schwab","doi":"10.1109/ICPADM.1994.414091","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414091","url":null,"abstract":"The new diagnosis method employs a classical PD measurement system consisting of a coupling capacitor, measuring impedance, and a \"wideband\" integrator, cascaded by an artificial network evaluation. Upon passing a polarity detection unit, the output signal of the \"wideband\" integrator is recorded via a digital storage oscilloscope which simultaneously serves as an interface to the subsequent computer-aided evaluation. The personal computer stores the PD-values in a phase resolving PD-matrix. After sufficient learning with training matrices the system recognizes different fault types with high probability. The recognition likelihood of trained patterns is almost 100 percent and of a new pattern approximately 90 percent, depending on both the number of training matrices and the repetition rate. The implemented artificial neural network is composed of a three layer backpropagation algorithm with threshold units and a recognition volume of up to 16 fault types. To guarantee the highest individual detection rate, each fault type must be trained with the same number of matrices. Thereafter, the network is able to recognize previously learned fault types without any other data pre- or post-processing, i.e. the diagnosis system relies exclusively on pattern recognition.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"18 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":"132754943","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.1994.414063
Liang Yaozhong, Zhu Derong, Wu Huayi
The contamination flashover and disruption of a power system due to external insulation pollution have become a major problem in the electrical power industry. Xinjiang in China is located at the edge of a desert region so that the contamination is more serious. Through many investigations in power system and research tests in the laboratory, many effective measures against contamination flashover have been put into use. It is shown from practice that the room temperature vulcanizing silicone coating is more appropriate to the desert climate condition than other measures. In this paper, the various properties of the silicone coating and the electrical performance of an insulator with such a coating are described.<>
{"title":"The research of measures against the contamination flashover of external insulation","authors":"Liang Yaozhong, Zhu Derong, Wu Huayi","doi":"10.1109/ICPADM.1994.414063","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414063","url":null,"abstract":"The contamination flashover and disruption of a power system due to external insulation pollution have become a major problem in the electrical power industry. Xinjiang in China is located at the edge of a desert region so that the contamination is more serious. Through many investigations in power system and research tests in the laboratory, many effective measures against contamination flashover have been put into use. It is shown from practice that the room temperature vulcanizing silicone coating is more appropriate to the desert climate condition than other measures. In this paper, the various properties of the silicone coating and the electrical performance of an insulator with such a coating are described.<<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":"133778322","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.1994.414140
D. Allan
In this paper, the theme of ageing and remnant insulation life is addressed from the viewpoint of the power equipment user. Aspects of the theme are developed, using as examples the oil impregnated paper insulating systems of power transformers. Other insulating systems are briefly reviewed using equipment of common use in a power utility as examples. Finally some major challenges for the future are given, particularly in relation to insulation research priority and methodology.<>
{"title":"Insulation ageing-a users perspective","authors":"D. Allan","doi":"10.1109/ICPADM.1994.414140","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414140","url":null,"abstract":"In this paper, the theme of ageing and remnant insulation life is addressed from the viewpoint of the power equipment user. Aspects of the theme are developed, using as examples the oil impregnated paper insulating systems of power transformers. Other insulating systems are briefly reviewed using equipment of common use in a power utility as examples. Finally some major challenges for the future are given, particularly in relation to insulation research priority and methodology.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"28 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114105563","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.1994.414152
A. Zahedi
The metal oxide varistors are used as voltage dependent switching devices to protect high voltage equipment and also low voltage electronic devices against transient overvoltages. The performance of a ZnO surge arrester (SA) is determined by the electrical and thermal properties of metal oxide elements, insulating materials used and design features of SA. The primary consideration in applying metal oxide SA is the thermal consideration of the environment. Ambient temperature and environmental conditions directly affect the performance of internal current drawn by and energy input to the metal oxide SA. The interaction between the polluted porcelain housing and the inner varistor columns due to capacitive coupling is responsible for the temperature rise of the varistor element. Metal oxide SAs are exposed to heavy thermal and electrical stresses if the porcelain housings of the units are polluted by industrial dusts, coastal salts, etc. The first part of this paper proposes an electrical model of SA that is computer simulated for leakage current investigation and the second part presents the effect of dry band on the performance of SA and damage due to this dry band.<>
{"title":"Effect of dry band on performance of UHV surge arrester and leakage current monitoring, using new developed model","authors":"A. Zahedi","doi":"10.1109/ICPADM.1994.414152","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414152","url":null,"abstract":"The metal oxide varistors are used as voltage dependent switching devices to protect high voltage equipment and also low voltage electronic devices against transient overvoltages. The performance of a ZnO surge arrester (SA) is determined by the electrical and thermal properties of metal oxide elements, insulating materials used and design features of SA. The primary consideration in applying metal oxide SA is the thermal consideration of the environment. Ambient temperature and environmental conditions directly affect the performance of internal current drawn by and energy input to the metal oxide SA. The interaction between the polluted porcelain housing and the inner varistor columns due to capacitive coupling is responsible for the temperature rise of the varistor element. Metal oxide SAs are exposed to heavy thermal and electrical stresses if the porcelain housings of the units are polluted by industrial dusts, coastal salts, etc. The first part of this paper proposes an electrical model of SA that is computer simulated for leakage current investigation and the second part presents the effect of dry band on the performance of SA and damage due to this dry band.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"82 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":"114490614","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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