Pub Date : 2010-11-18DOI: 10.1109/ICHVE.2010.5640727
D. Guo, D. Lathi, N. Harid, H. Griffiths, A. Haddad, A. Ainsley
Analytical and numerical simulation techniques have been developed for the calculation of earth resistance/impedance and to estimate the potential distribution in the vicinity of earth electrodes. However, very little literature is available on experimental validation of these calculation techniques. To address this, a programme of experimental tests on various earth electrodes has been carried out at the lower water reservoir of a hydro pumped-storage power station in North Wales. In this paper, the earthing test facility at Dinorwig power station is described including the details of the experimental set up. The results from experimental tests on a 5mx5m earth grid, immersed in water and energised are under ac, dc and impulse, are presented. The values of measured earth resistance/impedance and water surface potential distributions are compared with those obtained from analytical calculations and detailed numerical computer simulations.
{"title":"Experimental investigation into the performance of large-scale earthing electrodes","authors":"D. Guo, D. Lathi, N. Harid, H. Griffiths, A. Haddad, A. Ainsley","doi":"10.1109/ICHVE.2010.5640727","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640727","url":null,"abstract":"Analytical and numerical simulation techniques have been developed for the calculation of earth resistance/impedance and to estimate the potential distribution in the vicinity of earth electrodes. However, very little literature is available on experimental validation of these calculation techniques. To address this, a programme of experimental tests on various earth electrodes has been carried out at the lower water reservoir of a hydro pumped-storage power station in North Wales. In this paper, the earthing test facility at Dinorwig power station is described including the details of the experimental set up. The results from experimental tests on a 5mx5m earth grid, immersed in water and energised are under ac, dc and impulse, are presented. The values of measured earth resistance/impedance and water surface potential distributions are compared with those obtained from analytical calculations and detailed numerical computer simulations.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"42 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":"129706746","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}
In order to obtain the altitude correction factor of corona inception voltage of HVDC transmission lines within the range 23 to 4000 meters, a mobile corona test cage was used to research the influence of altitude changes on positive DC corona characteristics of several kinds of conductors. Photons released as a result of corona discharge on the conductors were detected by the ultraviolet detection apparatus. According to the apparent change of photon number, corona inception voltage could be acquired by the tangent method. With the obtained corona inception voltage in four altitudes, the exponential and linear correction formulas were introduced, which fitted well with the experimental values. Based on the correction relation, a correction coefficient of about −9.5%/1000m was recommended.
{"title":"Experimental investigation on altitude correction factor of positive dc corona inception voltages of transmission lines based on the mobile corona cage","authors":"X. Bian, Liming Wang, Z. Guan, Jing Cao, Yingjian Yang, Xiong Wu","doi":"10.1109/ICHVE.2010.5640704","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640704","url":null,"abstract":"In order to obtain the altitude correction factor of corona inception voltage of HVDC transmission lines within the range 23 to 4000 meters, a mobile corona test cage was used to research the influence of altitude changes on positive DC corona characteristics of several kinds of conductors. Photons released as a result of corona discharge on the conductors were detected by the ultraviolet detection apparatus. According to the apparent change of photon number, corona inception voltage could be acquired by the tangent method. With the obtained corona inception voltage in four altitudes, the exponential and linear correction formulas were introduced, which fitted well with the experimental values. Based on the correction relation, a correction coefficient of about −9.5%/1000m was recommended.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"370 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":"131054598","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.2010.5640746
Lijun Yang, R. Liao, Caixin Sun, Jianguo Yin, Mengzhao Zhu
With the development of new insulation materials, vegetable oil—the best substitute for mineral oil—has gradually been widely used in the liquid insulation of transformers. To investigate the influence of vegetable oil on the thermal aging rate of oil paper, Kraft paper impregnated with mineral oil and vegetable oil underwent thermally accelerated aging at three different temperatures. Degree Polymerization (DP) of Kraft paper was measured to indicate the aging degree of insulation paper. The aging rate of paper in mineral oil and vegetable oil was compared quantitatively, and results showed that vegetable oil retarded paper's degradation rate and extended its useful lifetime. The reasons contributing to such phenomenon were analyzed using X-ray Photoelectron Spectroscopy (XPS) and molecular simulation software. Due to the larger interaction force between water and natural ester molecules, water molecule was easily bonded with natural ester, weakening the hydrolysis process of cellulose. Cellulose was chemically modified by natural ester during thermal aging process, and the reactive - OH (hydroxyl) groups on the cellulose became esterified with fatty acid esters. The water molecule was firmly bounded to the ester groups on glucose produced by esterification. The long-chain fatty acid esterified to cellulose was parallel with cellulose chains and acted as a “water barrier” to further weaken the hydrolysis process.
{"title":"Influence of vegetable oil on the thermal aging rate of kraft paper and its mechanism","authors":"Lijun Yang, R. Liao, Caixin Sun, Jianguo Yin, Mengzhao Zhu","doi":"10.1109/ICHVE.2010.5640746","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640746","url":null,"abstract":"With the development of new insulation materials, vegetable oil—the best substitute for mineral oil—has gradually been widely used in the liquid insulation of transformers. To investigate the influence of vegetable oil on the thermal aging rate of oil paper, Kraft paper impregnated with mineral oil and vegetable oil underwent thermally accelerated aging at three different temperatures. Degree Polymerization (DP) of Kraft paper was measured to indicate the aging degree of insulation paper. The aging rate of paper in mineral oil and vegetable oil was compared quantitatively, and results showed that vegetable oil retarded paper's degradation rate and extended its useful lifetime. The reasons contributing to such phenomenon were analyzed using X-ray Photoelectron Spectroscopy (XPS) and molecular simulation software. Due to the larger interaction force between water and natural ester molecules, water molecule was easily bonded with natural ester, weakening the hydrolysis process of cellulose. Cellulose was chemically modified by natural ester during thermal aging process, and the reactive - OH (hydroxyl) groups on the cellulose became esterified with fatty acid esters. The water molecule was firmly bounded to the ester groups on glucose produced by esterification. The long-chain fatty acid esterified to cellulose was parallel with cellulose chains and acted as a “water barrier” to further weaken the hydrolysis process.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"178 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":"123179230","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.2010.5640785
W. Gil, W. Grzybowski, Przemysław Wronek
We show in this paper that the observed tendency to improve the operation reliability of the tap changer, justifies “on-line” monitoring of that component. We present the hardware and software solutions based on OLTC drive power comparison, which are especially useable for relatively aged transformers. We present the constructed device and its abilities. We explain that the integration of the applied methodology with an expert system is the best approach. We describe how the expert system forms warnings, alarms and directions which are based on reasonable factors. We will present a few registered diagrams signaling the existence of OLTC incorrectness or failures.
{"title":"On-line supervision of transformer on-load tap changer","authors":"W. Gil, W. Grzybowski, Przemysław Wronek","doi":"10.1109/ICHVE.2010.5640785","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640785","url":null,"abstract":"We show in this paper that the observed tendency to improve the operation reliability of the tap changer, justifies “on-line” monitoring of that component. We present the hardware and software solutions based on OLTC drive power comparison, which are especially useable for relatively aged transformers. We present the constructed device and its abilities. We explain that the integration of the applied methodology with an expert system is the best approach. We describe how the expert system forms warnings, alarms and directions which are based on reasonable factors. We will present a few registered diagrams signaling the existence of OLTC incorrectness or failures.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"15 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":"126379289","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.2010.5640855
J. P. Holtzhausen, P. Pieterse, H. Vermeulen
Corona is a partial electrical discharge and its inception depends on the gas density, which is affected by the ambient pressure and temperature. During times of power disruption, it may be necessary to overload certain feeders for a limited time, resulting in conductors running at temperatures above normal. The layer of air adjacent to the conductor is also heated. In this paper the effect of the higher temperature on corona is investigated experimentally. The effect of higher conductor temperatures on the corona inception levels is pointed out in particular.
{"title":"Investigation of the effect of conductor temperature on AC power line corona","authors":"J. P. Holtzhausen, P. Pieterse, H. Vermeulen","doi":"10.1109/ICHVE.2010.5640855","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640855","url":null,"abstract":"Corona is a partial electrical discharge and its inception depends on the gas density, which is affected by the ambient pressure and temperature. During times of power disruption, it may be necessary to overload certain feeders for a limited time, resulting in conductors running at temperatures above normal. The layer of air adjacent to the conductor is also heated. In this paper the effect of the higher temperature on corona is investigated experimentally. The effect of higher conductor temperatures on the corona inception levels is pointed out in particular.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"435 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114016349","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.2010.5640790
Xingliang Jiang, Yunfeng Xia
Overhead transmission lines generally operate in the wild harsh environment, and can be damaged for all kinds of causes. 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. As steel core is wrapped in the ACSR, it is hard to detect broken strand fault by traditional artificial distance method. Overhead transmission line inspection robot examines the conductor with detectors, so a detection scheme and correspondingly sensor based on leakage magnetic flux (LMF) theory for broken strand of steel core in ACSR is developed by this paper. The density of LMF field is calculated in the different degree damage and location of steel core in ACSR. The influence of magnetic field generated by transmission current to the detection scheme proposed by this paper is analyzed. Theoretical analysis and simulation results show that the proposed scheme based on LMF can detect all kinds of broken strand faults of steel core in ACSR with high precision and reliability. The principle of the proposed detection scheme is simple, so it could be applied to engineering practice.
{"title":"A LMF based broken strand faults detection scheme for steel core in ACSR","authors":"Xingliang Jiang, Yunfeng Xia","doi":"10.1109/ICHVE.2010.5640790","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640790","url":null,"abstract":"Overhead transmission lines generally operate in the wild harsh environment, and can be damaged for all kinds of causes. 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. As steel core is wrapped in the ACSR, it is hard to detect broken strand fault by traditional artificial distance method. Overhead transmission line inspection robot examines the conductor with detectors, so a detection scheme and correspondingly sensor based on leakage magnetic flux (LMF) theory for broken strand of steel core in ACSR is developed by this paper. The density of LMF field is calculated in the different degree damage and location of steel core in ACSR. The influence of magnetic field generated by transmission current to the detection scheme proposed by this paper is analyzed. Theoretical analysis and simulation results show that the proposed scheme based on LMF can detect all kinds of broken strand faults of steel core in ACSR with high precision and reliability. The principle of the proposed detection scheme is simple, so it could be applied to engineering practice.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"2 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":"122453493","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.2010.5640782
N. Jacob, W. McDermid, B. Kordi
An online Partial Discharge (PD) measurement performed on a High Voltage Direct Current (HVDC) wall bushing successfully identified the presence of internal discharges. The wall bushing is a sulfur hexafluoride gasinsulated bushing, rated for 500kVdc and terminated on a thyristor controlled HVDC converter bridge. The measurement of PD within the HVDC station environment is particularly challenging due to the high levels of electromagnetic noise caused by thyristor switching events, and external air-corona from the neighboring high-voltage equipment. An additional challenge is the “mixed“ voltage stress on the bushing insulation, which has both ac and dc high-voltage components. There are also fast transients during the firing of thyristors in the HVDC conversion process that cause added stress to the insulation. As a result, the analysis and interpretation of PD data for HVDC equipment is more complex; PD pulses may occur in response to the ac, dc, or switching transient voltage stresses. In this paper, an online PD measurement strategy for noise filtering and isolation of PD sources within the bushing are discussed. The PD measurement data is plotted on a phase-resolved diagram where the line cord voltage was used as a reference. The phase-resolved diagram appears to suggest that the fast transients caused during switching, trigger some PD events. The findings from the online PD measurements are verified with physical evidence, found after the bushing was removed from service.
{"title":"Online partial discharge measurement of a high-voltage direct current converter wall-bushing","authors":"N. Jacob, W. McDermid, B. Kordi","doi":"10.1109/ICHVE.2010.5640782","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640782","url":null,"abstract":"An online Partial Discharge (PD) measurement performed on a High Voltage Direct Current (HVDC) wall bushing successfully identified the presence of internal discharges. The wall bushing is a sulfur hexafluoride gasinsulated bushing, rated for 500kVdc and terminated on a thyristor controlled HVDC converter bridge. The measurement of PD within the HVDC station environment is particularly challenging due to the high levels of electromagnetic noise caused by thyristor switching events, and external air-corona from the neighboring high-voltage equipment. An additional challenge is the “mixed“ voltage stress on the bushing insulation, which has both ac and dc high-voltage components. There are also fast transients during the firing of thyristors in the HVDC conversion process that cause added stress to the insulation. As a result, the analysis and interpretation of PD data for HVDC equipment is more complex; PD pulses may occur in response to the ac, dc, or switching transient voltage stresses. In this paper, an online PD measurement strategy for noise filtering and isolation of PD sources within the bushing are discussed. The PD measurement data is plotted on a phase-resolved diagram where the line cord voltage was used as a reference. The phase-resolved diagram appears to suggest that the fast transients caused during switching, trigger some PD events. The findings from the online PD measurements are verified with physical evidence, found after the bushing was removed from service.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"5 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":"123935489","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.2010.5640736
Weigen Chen, Xi Chen, Ju Tang
Oil-paper insulation system is the most common insulation method of high-voltage apparatus. As the event of air-gap discharge can lead to aging and disruption of the insulation system, awareness of emergence and development of air-gap discharge in time could be helpful in finding internal latent fault of oil-paper insulation system. The paper does research on the air-gap discharge in the oil-paper insulation, and uses kernel principal component analysis method to reduce the dimension of statistical parameters and to extract new characteristic parameters. The sample signals at different times during the development process of discharge are adopted to cluster the new characteristic parameters. The air-gap discharge development process can be divided into four stages according to the information generated at different periods of the process combined with the clustering results. The four stages can be defined as: incipient discharge, developing discharge, constant discharge, pre-breakdown.
{"title":"Characteristic parameters and development properties of air-gap discharge in oil-paper insulation","authors":"Weigen Chen, Xi Chen, Ju Tang","doi":"10.1109/ICHVE.2010.5640736","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640736","url":null,"abstract":"Oil-paper insulation system is the most common insulation method of high-voltage apparatus. As the event of air-gap discharge can lead to aging and disruption of the insulation system, awareness of emergence and development of air-gap discharge in time could be helpful in finding internal latent fault of oil-paper insulation system. The paper does research on the air-gap discharge in the oil-paper insulation, and uses kernel principal component analysis method to reduce the dimension of statistical parameters and to extract new characteristic parameters. The sample signals at different times during the development process of discharge are adopted to cluster the new characteristic parameters. The air-gap discharge development process can be divided into four stages according to the information generated at different periods of the process combined with the clustering results. The four stages can be defined as: incipient discharge, developing discharge, constant discharge, pre-breakdown.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"34 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":"123964753","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.2010.5640878
Clayton L. Clem, J. H. Nelson
The Tennessee Valley Authority (TVA) is a wholly-owned corporation of the United States of America formed in 1933 by an Act of Congress. This paper presents an historical overview of the TVA system, a present day and future outlook, and a discussion of future trends in the power industry and their impact on the bulk transmission system.
{"title":"The TVA transmission system: Facts, figures and trends","authors":"Clayton L. Clem, J. H. Nelson","doi":"10.1109/ICHVE.2010.5640878","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640878","url":null,"abstract":"The Tennessee Valley Authority (TVA) is a wholly-owned corporation of the United States of America formed in 1933 by an Act of Congress. This paper presents an historical overview of the TVA system, a present day and future outlook, and a discussion of future trends in the power industry and their impact on the bulk transmission system.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"71 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":"123979271","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.2010.5640837
M. Florkowski, J. Furgał
Transformers operating in power grid or in industrial environment are subjected nowadays also to transients or stimulus with ultrafast wavefronts. Traditionally, in case of power transformers the stresses are related to lightning and switching phenomena. In industrial networks distribution transformers are exposed to many switching operations generating often overvoltages. Transformer windings subjected to such effects are stressed due to the voltage distribution along the winding and potential resonance phenomena. Initial voltage distribution, reflects mainly the capacitive coupling between turns, windings, core and tank. The non uniform character stress concentration on certain parts of the winding. Winding resonance might occur, if the spectrum of incoming surge voltage matches the winding one, the corresponding resonance will be excited. Therefore external transients occurring in power systems might trigger internal overvoltages with large maximum value in transformer windings. The paper presents results of voltage distribution measurements performed on disk and layer winding subjected to ultra fast stresses. The spatial distribution of the stress as a function of surge rise time and winding position will be presented. Special focus is paid on the analysis of the surge rise time and steepness on the winding stress. The presented results might be used both for design and optimization of transformers windings.
{"title":"Initial voltage distributions in transformer windings at ultra fast stresses","authors":"M. Florkowski, J. Furgał","doi":"10.1109/ICHVE.2010.5640837","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640837","url":null,"abstract":"Transformers operating in power grid or in industrial environment are subjected nowadays also to transients or stimulus with ultrafast wavefronts. Traditionally, in case of power transformers the stresses are related to lightning and switching phenomena. In industrial networks distribution transformers are exposed to many switching operations generating often overvoltages. Transformer windings subjected to such effects are stressed due to the voltage distribution along the winding and potential resonance phenomena. Initial voltage distribution, reflects mainly the capacitive coupling between turns, windings, core and tank. The non uniform character stress concentration on certain parts of the winding. Winding resonance might occur, if the spectrum of incoming surge voltage matches the winding one, the corresponding resonance will be excited. Therefore external transients occurring in power systems might trigger internal overvoltages with large maximum value in transformer windings. The paper presents results of voltage distribution measurements performed on disk and layer winding subjected to ultra fast stresses. The spatial distribution of the stress as a function of surge rise time and winding position will be presented. Special focus is paid on the analysis of the surge rise time and steepness on the winding stress. The presented results might be used both for design and optimization of transformers windings.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"49 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":"127766510","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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