Pub Date : 2010-11-18DOI: 10.1109/ICHVE.2010.5640853
K. Rapp, C. Patrick McShane, J. Vandermaar, D. Vuković, S. Tenbohlen
Dielectric breakdown values were measured in 50– 150 mm gaps in natural ester fluid and mineral oil. The tests included 50/60 Hz and 1.2×50 µs lightning impulse using negative and positive polarities. The voltage levels attained by natural ester fluid compare closely with mineral oil and would support the use of natural ester fluid in transformers through power insulation classes.
{"title":"Long gap breakdown of natural ester fluid","authors":"K. Rapp, C. Patrick McShane, J. Vandermaar, D. Vuković, S. Tenbohlen","doi":"10.1109/ICHVE.2010.5640853","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640853","url":null,"abstract":"Dielectric breakdown values were measured in 50– 150 mm gaps in natural ester fluid and mineral oil. The tests included 50/60 Hz and 1.2×50 µs lightning impulse using negative and positive polarities. The voltage levels attained by natural ester fluid compare closely with mineral oil and would support the use of natural ester fluid in transformers through power insulation classes.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"539 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116492573","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640793
Xingliang Jiang, Yunfeng Xia
Steel stranded wire plays a supportive role for aluminum conductor steel-reinforced (ACSR), so that detection for broken strand of steel core is an important mean to insure safety operation of transmission lines. A detection sensor based on leakage magnetic flux (LMF) theory for broken strand of steel core in ACSR is developed by this paper, and the size of the detector is optimized by the modified niche adaptive genetic algorithm correspondingly. The detector can be carried by inspection robot to examine the conductors along overhead transmission lines. In the proposed detection scheme, the steel core in ACSR can be magnetized by 48H# Rb-Fe-B rare earth permanent magnet. Optimization design model is proposed, achieving minimal weight of detector is selected as the object function. Theoretical analysis and application results show that the proposed optimization method has a great ability of local searching and convergence rate, the design magnetization requirement is satisfied and the weight of detector is decreased, then the carrying capability of inspection robot is improved.
{"title":"A GA based optimized designation of detection sensor for broken steel stranded wire faults in ACSR","authors":"Xingliang Jiang, Yunfeng Xia","doi":"10.1109/ICHVE.2010.5640793","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640793","url":null,"abstract":"Steel stranded wire plays a supportive role for aluminum conductor steel-reinforced (ACSR), so that detection for broken strand of steel core is an important mean to insure safety operation of transmission lines. A detection sensor based on leakage magnetic flux (LMF) theory for broken strand of steel core in ACSR is developed by this paper, and the size of the detector is optimized by the modified niche adaptive genetic algorithm correspondingly. The detector can be carried by inspection robot to examine the conductors along overhead transmission lines. In the proposed detection scheme, the steel core in ACSR can be magnetized by 48H# Rb-Fe-B rare earth permanent magnet. Optimization design model is proposed, achieving minimal weight of detector is selected as the object function. Theoretical analysis and application results show that the proposed optimization method has a great ability of local searching and convergence rate, the design magnetization requirement is satisfied and the weight of detector is decreased, then the carrying capability of inspection robot is improved.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133780615","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640706
W. Bretuj, K. Wieczorek
Results of ageing tests of model composite insulators in rain and fog chambers are presented. The influence of different operating positions of the insulators: vertical, inclined and horizontal, on the development of leakage currents on their surfaces during the leakage tests is discussed. An important role of sheds inclination of the insulators in the leakage currents restriction is emphasized.
{"title":"Influence of composite insulator operating position on the development of aging process under AC high voltage and water precipitation","authors":"W. Bretuj, K. Wieczorek","doi":"10.1109/ICHVE.2010.5640706","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640706","url":null,"abstract":"Results of ageing tests of model composite insulators in rain and fog chambers are presented. The influence of different operating positions of the insulators: vertical, inclined and horizontal, on the development of leakage currents on their surfaces during the leakage tests is discussed. An important role of sheds inclination of the insulators in the leakage currents restriction is emphasized.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131222667","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640759
Y. Bouslimi, I. Fofana, H. Hemmatjou, C. Volat
The present paper is devoted to the study of the Electrostatic Charging Tendency (ECT) of fresh (unused) and aged transformer oils using a spinning disk system. A series of experiments were conducted under laboratory controlled conditions. The monitored parameters (conductivity, dissipation factor, water content, dissolved decay products, resistivity, turbidity ...) show that the electrification currents increase with temperature, fluid motion velocity, surface properties and the aging byproducts of the oil. The polarity, the amplitude and the time constant of the electrification currents are also affected. This contribution is not only intended to provide a fresh review in this domain of research, but also contains a substantial amount of new material with a view of closing some gaps in the present state of knowledge of oil streaming electrification.
{"title":"Static electrification assessment of transformer oils in the spinning disc system","authors":"Y. Bouslimi, I. Fofana, H. Hemmatjou, C. Volat","doi":"10.1109/ICHVE.2010.5640759","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640759","url":null,"abstract":"The present paper is devoted to the study of the Electrostatic Charging Tendency (ECT) of fresh (unused) and aged transformer oils using a spinning disk system. A series of experiments were conducted under laboratory controlled conditions. The monitored parameters (conductivity, dissipation factor, water content, dissolved decay products, resistivity, turbidity ...) show that the electrification currents increase with temperature, fluid motion velocity, surface properties and the aging byproducts of the oil. The polarity, the amplitude and the time constant of the electrification currents are also affected. This contribution is not only intended to provide a fresh review in this domain of research, but also contains a substantial amount of new material with a view of closing some gaps in the present state of knowledge of oil streaming electrification.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132889360","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640772
R. Liao, J. Hao, Lijun Yang, Shuaiwei Liang, Jianguo Yin
This paper is aimed at improving the anti-aging properties of power transformers via using mineral oil/natural ester mixtures (mixed insulating oil). Accelerated thermal aging of two kinds of oil-paper insulation at 110°C were conducted in order to compare the aging characteristics of Kraft paper immersed in mixed insulating oil and mineral oil. The extent of paper degradation after aging was determined using the paper degree of polymerization (DP). The dissipation factor of aged oils and papers in two kinds of oil-paper insulation, and the structure of papers immersed in mixed insulating oil and mineral oil were also investigated. Paper immersed in mixed insulating oil degrades at a slower rate than in mineral oil. Compared with mineral oil/paper insulation, the transesterification of cellulose impregnated with mixed insulating oil can restrain the aging of paper. After aging 782 days, the dissipation factor of mixed insulating oil is nearly all smaller than mineral oil from 10-1Hz to 106Hz, and the dissipation factor of paper aged in mixed insulating oil is smaller than paper aged in mineral oil from 10-1Hz to 103Hz.
{"title":"Improvement on the anti-aging properties of power transformers by using mixed insulating oil","authors":"R. Liao, J. Hao, Lijun Yang, Shuaiwei Liang, Jianguo Yin","doi":"10.1109/ICHVE.2010.5640772","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640772","url":null,"abstract":"This paper is aimed at improving the anti-aging properties of power transformers via using mineral oil/natural ester mixtures (mixed insulating oil). Accelerated thermal aging of two kinds of oil-paper insulation at 110°C were conducted in order to compare the aging characteristics of Kraft paper immersed in mixed insulating oil and mineral oil. The extent of paper degradation after aging was determined using the paper degree of polymerization (DP). The dissipation factor of aged oils and papers in two kinds of oil-paper insulation, and the structure of papers immersed in mixed insulating oil and mineral oil were also investigated. Paper immersed in mixed insulating oil degrades at a slower rate than in mineral oil. Compared with mineral oil/paper insulation, the transesterification of cellulose impregnated with mixed insulating oil can restrain the aging of paper. After aging 782 days, the dissipation factor of mixed insulating oil is nearly all smaller than mineral oil from 10-1Hz to 106Hz, and the dissipation factor of paper aged in mixed insulating oil is smaller than paper aged in mineral oil from 10-1Hz to 103Hz.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133385761","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640835
Z. Adzis, Z. Abdul Malek, H. Ahmad, Aulia
Lightning induces voltage on a horizontally suspended conductor due to electromagnetic field coupling. If the induced voltage is measured across a matched impedance at both ends, it may be possible to locate the distance and angle of incidence of the lightning. Researches on lightning induced voltages mainly focus on its effect to insulation across the conductor and ground. The situation is modeled in time domain, to plot the lightning distribution of a specific area of particular size. From the results, the relationship of induced voltages to the distance and angle of incidence of the cloud to ground lightning is to be presented. A thorough study on extracting information of each lightning incident parameters (i.e. distance and angle) from expected induced voltages is discussed. The model will be tested on a physical mock setup for its concept and applicability. The parameters obtained and actual parameters are to be compared and discussed.
{"title":"Modeling induced voltages on ends of suspended conductor to locate nearby lightning","authors":"Z. Adzis, Z. Abdul Malek, H. Ahmad, Aulia","doi":"10.1109/ICHVE.2010.5640835","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640835","url":null,"abstract":"Lightning induces voltage on a horizontally suspended conductor due to electromagnetic field coupling. If the induced voltage is measured across a matched impedance at both ends, it may be possible to locate the distance and angle of incidence of the lightning. Researches on lightning induced voltages mainly focus on its effect to insulation across the conductor and ground. The situation is modeled in time domain, to plot the lightning distribution of a specific area of particular size. From the results, the relationship of induced voltages to the distance and angle of incidence of the cloud to ground lightning is to be presented. A thorough study on extracting information of each lightning incident parameters (i.e. distance and angle) from expected induced voltages is discussed. The model will be tested on a physical mock setup for its concept and applicability. The parameters obtained and actual parameters are to be compared and discussed.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133333674","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640809
C.A. Spanias, C. Christodoulou, I. Gonos, I. Stathopulos
Aim of the current work is the experimental study of the electric field distribution around a medium voltage metal oxide gapless polymeric housing surge arrester, since the study and the knowledge of the electric field around an arrester can be useful for diagnostic tests and design procedures. The measurements were carried out, using two appropriate calibrated field meters. The results are accompanied with their total uncertainties, which were computed using the obtained measurements and data from the calibrations certificates.
{"title":"Electric field measurements around a metal oxide surge arrester","authors":"C.A. Spanias, C. Christodoulou, I. Gonos, I. Stathopulos","doi":"10.1109/ICHVE.2010.5640809","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640809","url":null,"abstract":"Aim of the current work is the experimental study of the electric field distribution around a medium voltage metal oxide gapless polymeric housing surge arrester, since the study and the knowledge of the electric field around an arrester can be useful for diagnostic tests and design procedures. The measurements were carried out, using two appropriate calibrated field meters. The results are accompanied with their total uncertainties, which were computed using the obtained measurements and data from the calibrations certificates.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129314109","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640852
M. Rezinkina, O. Rezinkin, S. Chalise, H. Gupta, C. Bean
In the paper, the statistical modeling method of the lightning attachment process to extended objects has been proposed. The modeling takes into account the probabilities of lightning occurrence with current of different amplitudes, and nonlinear variation of spark resistance at leader channel growth. The method also takes into consideration dependence of velocity and acceleration of a lightning leader on its potential. The method is implemented to analyze a high voltage substation lightning protection system.
{"title":"Statistical modeling of the process of lightning attachment to extended objects","authors":"M. Rezinkina, O. Rezinkin, S. Chalise, H. Gupta, C. Bean","doi":"10.1109/ICHVE.2010.5640852","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640852","url":null,"abstract":"In the paper, the statistical modeling method of the lightning attachment process to extended objects has been proposed. The modeling takes into account the probabilities of lightning occurrence with current of different amplitudes, and nonlinear variation of spark resistance at leader channel growth. The method also takes into consideration dependence of velocity and acceleration of a lightning leader on its potential. The method is implemented to analyze a high voltage substation lightning protection system.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121705467","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640766
J. N’cho, T. Aka-Ngnui, A. Beroual, I. Fofana
Since the electrical stress is unavoidable in power transformers, the ability of oil to resist decomposition under electrical stress is of paramount importance for the safety of these important devices. Electrical stress together with heat and moisture, in the presence of oxygen, oxidises the oil producing free radicals, acids and sludge that are deleterious to the transformer. In this paper, the effect of electrical discharges on oil properties is reported. The results indicate that the quality of oil is considerably affected, with increasing voltage stress. Comparing oil properties before and after voltage application allow assessing the outcome of random secondary chemical reactions between large oil born free radicals.
{"title":"Effect of electrical discharge on oil decaying process","authors":"J. N’cho, T. Aka-Ngnui, A. Beroual, I. Fofana","doi":"10.1109/ICHVE.2010.5640766","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640766","url":null,"abstract":"Since the electrical stress is unavoidable in power transformers, the ability of oil to resist decomposition under electrical stress is of paramount importance for the safety of these important devices. Electrical stress together with heat and moisture, in the presence of oxygen, oxidises the oil producing free radicals, acids and sludge that are deleterious to the transformer. In this paper, the effect of electrical discharges on oil properties is reported. The results indicate that the quality of oil is considerably affected, with increasing voltage stress. Comparing oil properties before and after voltage application allow assessing the outcome of random secondary chemical reactions between large oil born free radicals.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"15 9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122117644","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640810
C. Volat, F. Meghnefi, M. Farzaneh
This paper presents a simple method to assess the severity of ice built-ups in EHV substations. The proposed method is based on the monitoring of the leakage current (LC) and the applied voltage of an EHV standard station insulator. By simply studying the LC evolution of several experimental tests, it was established that the evolution of a LC envelope is divided in two distinct periods where the transition between these two periods is clearly identified and is correlated with the bridging of the shed spacing by icicles. It was also observed that the duration of the first period is only dependent of the icing rate and is not influenced by the applied water conductivity. From these observations, it is possible to estimate the icing rate of an accumulation using specific tools like artificial neural networks (ANN). ANN is used to detect the onset of the ice accumulation with permits to calculate the duration of Period 1 and estimate the icing rate which is one of the most important characteristic of ice built-up severity.
{"title":"A simple method to assess ice built-up severity in EHV substations","authors":"C. Volat, F. Meghnefi, M. Farzaneh","doi":"10.1109/ICHVE.2010.5640810","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640810","url":null,"abstract":"This paper presents a simple method to assess the severity of ice built-ups in EHV substations. The proposed method is based on the monitoring of the leakage current (LC) and the applied voltage of an EHV standard station insulator. By simply studying the LC evolution of several experimental tests, it was established that the evolution of a LC envelope is divided in two distinct periods where the transition between these two periods is clearly identified and is correlated with the bridging of the shed spacing by icicles. It was also observed that the duration of the first period is only dependent of the icing rate and is not influenced by the applied water conductivity. From these observations, it is possible to estimate the icing rate of an accumulation using specific tools like artificial neural networks (ANN). ANN is used to detect the onset of the ice accumulation with permits to calculate the duration of Period 1 and estimate the icing rate which is one of the most important characteristic of ice built-up severity.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122392236","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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