Pub Date : 2014-08-01DOI: 10.1109/ICACACT.2014.7223587
B. Cella, T. Lebey, C. Abadie
Increasing the voltage in aircraft applications may induce reliability problems associated to the occurrence of partial discharges (PD) in systems. Moreover, the specificities of both the environmental conditions (temperature, pressure, relative humidity …) and of the harsh electrical conditions (high voltage, high frequency, high dV/dt …) contribute to the risk of partial discharges. This paper describes the assessment of a new method to detect PD in aerospace Power Electronics (PE) systems. In order to properly understand the behavior of PD in these systems, the method is first applied on the so-called “constituents” i.e on the different types of insulating materials used to build components (PCB, Inductance, Capacitance, Busbars, Power Modules …) of aerospace PE inverters. This investigation is the first step of a larger study aiming to evaluate the validity of this method to detect PD in a complete aerospace PE system during operation.
{"title":"Partial discharges measurements at the constituents' level of aerospace power electronics converters","authors":"B. Cella, T. Lebey, C. Abadie","doi":"10.1109/ICACACT.2014.7223587","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223587","url":null,"abstract":"Increasing the voltage in aircraft applications may induce reliability problems associated to the occurrence of partial discharges (PD) in systems. Moreover, the specificities of both the environmental conditions (temperature, pressure, relative humidity …) and of the harsh electrical conditions (high voltage, high frequency, high dV/dt …) contribute to the risk of partial discharges. This paper describes the assessment of a new method to detect PD in aerospace Power Electronics (PE) systems. In order to properly understand the behavior of PD in these systems, the method is first applied on the so-called “constituents” i.e on the different types of insulating materials used to build components (PCB, Inductance, Capacitance, Busbars, Power Modules …) of aerospace PE inverters. This investigation is the first step of a larger study aiming to evaluate the validity of this method to detect PD in a complete aerospace PE system during operation.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124077545","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}
Epoxy-Anhydride VPI resin generally has excellent electrical insulation properties, mechanical properties and much lower curing volatile than other types of VPI resins, such as Epoxy Ester-Styrene system and Unsaturated Polyesterimide-Vinyltoluene system. So it is widely used in insulation applications of electrical apparatus. In this paper, a toughness modified epoxy-anhydride VPI resin was developed, and partial evaluation results of the newly developed Epoxy-Anhydride VPI resin on coils for high voltage (HV) motors are reported. The mechanical properties are tested and compared with commercial epoxy-anhydride resin. The electrical insulation properties including dielectric loss, breakdown voltage, partial discharge, electrical aging life etc. of 13.8kV coils for HV motors are studied and compared with the Unsaturated Polyesterimide-Vinyltoluene and commercial epoxy-anhydride VPI resin systems. The results indicate that HV coils treated with this Epoxy-Anhydride VPI resin are of superior insulation properties.
{"title":"Application of newly developed Epoxy-Anhydride VPI resin for high voltage motors and generators","authors":"Yu Xia, Wen Wang, Chunchu Tao, Cuicui Li, Shaobo He, William Chen","doi":"10.1109/ICACACT.2014.7223557","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223557","url":null,"abstract":"Epoxy-Anhydride VPI resin generally has excellent electrical insulation properties, mechanical properties and much lower curing volatile than other types of VPI resins, such as Epoxy Ester-Styrene system and Unsaturated Polyesterimide-Vinyltoluene system. So it is widely used in insulation applications of electrical apparatus. In this paper, a toughness modified epoxy-anhydride VPI resin was developed, and partial evaluation results of the newly developed Epoxy-Anhydride VPI resin on coils for high voltage (HV) motors are reported. The mechanical properties are tested and compared with commercial epoxy-anhydride resin. The electrical insulation properties including dielectric loss, breakdown voltage, partial discharge, electrical aging life etc. of 13.8kV coils for HV motors are studied and compared with the Unsaturated Polyesterimide-Vinyltoluene and commercial epoxy-anhydride VPI resin systems. The results indicate that HV coils treated with this Epoxy-Anhydride VPI resin are of superior insulation properties.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124577191","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223493
P. Amaro, M. Facciotti, P. Lewin, J. Pilgrim, R. C. Brown, G. Wilson, P. Jarman
Copper sulfide related failures of oil-filled plants have become more common around most parts of the world over the last couple of decades, which has led the industry to re-evaluate their asset risk analysis policy for mineral oil insulated power assets. Two main theories for the failure event suggested by the current state-of-the-art are thermal runaway and turn-to-turn disk electrical breakdown. This paper provides an over view of two possible failure scenarios, electrical breakdown and low degree of polymerization, and the likelihood of corrosive oil causing each scenario. Empirical DP studies have demonstrated that the corrosion process degrades the chemical cellulose chain bonds, where DP-life expectancy models demonstrated that the corrosion process reduces 33 % of the transformer life expectancy. The electrical breakdown strength experiments demonstrated that the CuxS deposits reduced the electrical breakdown strength of each Kraft paper layer. Finally the results are considered in the larger context of the transformer insulation life-expectancy and its probability of causing the failure event.
{"title":"Investigation of the electrical and chemical processes causing the failure event in a copper sulfide related transformer failure","authors":"P. Amaro, M. Facciotti, P. Lewin, J. Pilgrim, R. C. Brown, G. Wilson, P. Jarman","doi":"10.1109/ICACACT.2014.7223493","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223493","url":null,"abstract":"Copper sulfide related failures of oil-filled plants have become more common around most parts of the world over the last couple of decades, which has led the industry to re-evaluate their asset risk analysis policy for mineral oil insulated power assets. Two main theories for the failure event suggested by the current state-of-the-art are thermal runaway and turn-to-turn disk electrical breakdown. This paper provides an over view of two possible failure scenarios, electrical breakdown and low degree of polymerization, and the likelihood of corrosive oil causing each scenario. Empirical DP studies have demonstrated that the corrosion process degrades the chemical cellulose chain bonds, where DP-life expectancy models demonstrated that the corrosion process reduces 33 % of the transformer life expectancy. The electrical breakdown strength experiments demonstrated that the CuxS deposits reduced the electrical breakdown strength of each Kraft paper layer. Finally the results are considered in the larger context of the transformer insulation life-expectancy and its probability of causing the failure event.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115972370","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223535
S. Boggs, A. Kumada, T. Yoshimitsu
The end turn grading of a form-wound machine is coupled capacitively to the stator conductor so that only derivatives of the conductor voltage are relevant to the performance of the end turn grading. In other words, the key factors are the “slew rate”, i.e., the derivative of the conductor voltage with respect to time, and the capacitance per unit length between the stator conductor and conductor armor tape (CAT) and nonlinear stress grading (SG). Both the CAT and SG can participate in grading for high slew rates, and the peak field along the SG can be estimated from fundamental considerations.
{"title":"End-turn grading for PWM-driven machines","authors":"S. Boggs, A. Kumada, T. Yoshimitsu","doi":"10.1109/ICACACT.2014.7223535","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223535","url":null,"abstract":"The end turn grading of a form-wound machine is coupled capacitively to the stator conductor so that only derivatives of the conductor voltage are relevant to the performance of the end turn grading. In other words, the key factors are the “slew rate”, i.e., the derivative of the conductor voltage with respect to time, and the capacitance per unit length between the stator conductor and conductor armor tape (CAT) and nonlinear stress grading (SG). Both the CAT and SG can participate in grading for high slew rates, and the peak field along the SG can be estimated from fundamental considerations.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117284600","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223572
K. Abdolall, A. J. Vandermaar, M. Stephens, Dexter Tarampi
This paper presents the results of a test program on the effects of tests used in condition assessment of XLPE cables nearing the end of their life. The test program was carried out on submarine cables removed from service. The work consisted of two parts: Part 1 (cable evaluation tests to determine the condition of the cable) which included partial discharge, 60 Hz tan δ, AC breakdown tests, dissection and water tree analysis, and failure analysis of the failure site, and Part 2 (Effects of testing) which included lab tests to determine the effects of switching surges, VLF tan δ, and the LIpA test. Partial discharge tests were carried out on samples before and after switching surge tests, VLF tan δ tests, and the LIpA Test (Part 2). In addition some of the samples that were subjected to the different tests were aged at 14.4 kV in salt water for 284.5 days. The test results are discussed in term of the effects of the different test techniques used in condition assessment of XLPE cables suffering from advanced water tree related degradation.
本文介绍了一个测试程序的结果，该测试程序用于XLPE电缆接近使用寿命的状态评估。测试项目是在停用的海底电缆上进行的。这项工作包括两部分:第一部分(电缆评估测试，以确定电缆的状况)，包括局部放电、60 Hz tan δ、交流击穿测试、解剖和水树分析，以及故障现场的故障分析;第二部分(测试的影响)，包括实验室测试，以确定开关浪涌、VLF tan δ和LIpA测试的影响。在开关浪涌试验、VLF tan δ试验和LIpA试验(第二部分)前后分别进行了局部放电试验，并在14.4 kV盐水中进行了284.5 d的老化试验。讨论了不同测试技术对交联聚乙烯电缆受水树相关退化影响的影响。
{"title":"Effects of testing on service aged XLPE cables","authors":"K. Abdolall, A. J. Vandermaar, M. Stephens, Dexter Tarampi","doi":"10.1109/ICACACT.2014.7223572","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223572","url":null,"abstract":"This paper presents the results of a test program on the effects of tests used in condition assessment of XLPE cables nearing the end of their life. The test program was carried out on submarine cables removed from service. The work consisted of two parts: Part 1 (cable evaluation tests to determine the condition of the cable) which included partial discharge, 60 Hz tan δ, AC breakdown tests, dissection and water tree analysis, and failure analysis of the failure site, and Part 2 (Effects of testing) which included lab tests to determine the effects of switching surges, VLF tan δ, and the LIpA test. Partial discharge tests were carried out on samples before and after switching surge tests, VLF tan δ tests, and the LIpA Test (Part 2). In addition some of the samples that were subjected to the different tests were aged at 14.4 kV in salt water for 284.5 days. The test results are discussed in term of the effects of the different test techniques used in condition assessment of XLPE cables suffering from advanced water tree related degradation.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114775359","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223584
P. Lewin, J. Fothergill, S. Dodd
There is some field evidence that certain manufactured batches of thin film X2 capacitors are more susceptible to electro-chemical corrosion than others. Studies undertaken at the University of Leicester, City University London and the University of Southampton have investigated this degradation mechanism, developed underlying theory for this behaviour and validated the theory using data from damp heat testing. This paper details the anatomy of thin film X2 capacitors, details the principal mechanisms of degradation and breakdown before explaining the electrochemical corrosion mechanism and associated loss of capacitance. The effects of this degradation mechanism on other properties of the capacitor are shown to be minimal as evidenced by dielectric spectroscopy and other measurements. The ultimate conclusion is that unlike other types of capacitor, a pre-defined drop in initial capacitance does not signify end of useful life and for specific applications end of life of an X2 capacitor should be defined as the minimum value of X2 capacitance that will ensure reliable operation of a given circuit.
{"title":"Electro-chemical degradation of thin film X2 safety capacitors","authors":"P. Lewin, J. Fothergill, S. Dodd","doi":"10.1109/ICACACT.2014.7223584","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223584","url":null,"abstract":"There is some field evidence that certain manufactured batches of thin film X2 capacitors are more susceptible to electro-chemical corrosion than others. Studies undertaken at the University of Leicester, City University London and the University of Southampton have investigated this degradation mechanism, developed underlying theory for this behaviour and validated the theory using data from damp heat testing. This paper details the anatomy of thin film X2 capacitors, details the principal mechanisms of degradation and breakdown before explaining the electrochemical corrosion mechanism and associated loss of capacitance. The effects of this degradation mechanism on other properties of the capacitor are shown to be minimal as evidenced by dielectric spectroscopy and other measurements. The ultimate conclusion is that unlike other types of capacitor, a pre-defined drop in initial capacitance does not signify end of useful life and for specific applications end of life of an X2 capacitor should be defined as the minimum value of X2 capacitance that will ensure reliable operation of a given circuit.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114699724","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223492
M. Facciotti, P. Amaro, R.C.D. Brown, P. Lewin, J. Pilgrim, G. Wilson, P. Jarman
In every high voltage grid, the replacement of assets is a slow but steady process that guarantees long-term reliability of the power distribution networks. The prioritisation of such interventions is based on complex rating criteria specifically designed to highlight potential issues of certain machines (or families of machines) in need of care. Given the tremendous costs of operations such as the replacement of a power transformer it is not surprising to observe constant efforts devoted to finding new and better monitoring and diagnostic tools. These are capable of delivering invaluable information about the conditions of a transformer, in service or after it is either failed or proactively scrapped, allowing a better comprehension of underlying chemical-physical phenomena occurring. Ideally, advanced monitoring and diagnostic tools should ultimately result in improved rating parameters to be applied in the evaluation of future interventions. This feasibility study evaluates the use of static secondary ion mass spectrometry (SSIMS) molecular selective imaging as a diagnostic tool for power transformer. SSIMS is herein demonstrated to be able to assess, without doubts, the presence and integrity of the passivation layer produced by Irgamet®39 on copper surfaces in laboratory tests. The technique has also been tested on real samples collected from one of the phases of a 400/275kV autotransformer proactively scrapped and proved to be applicable without significant sample preparation. The possibility of its use in the study of the distribution of Irgamet®39 across the windings is also demonstrated. Further development of SSIMS as a diagnostic tool would be significantly increasing the grade of detail at which scrapped/failed units could be inspected. A better understanding on how the operating conditions or the design of a transformer can affect the anticorrosion protection layer at the molecular level would open the way to significant ad hoc improvements of both operative guidelines and rating criteria for power transformers
{"title":"SSIMS molecular selective imaging: A new diagnostic tool to investigate metal passivators in scrapped transformers","authors":"M. Facciotti, P. Amaro, R.C.D. Brown, P. Lewin, J. Pilgrim, G. Wilson, P. Jarman","doi":"10.1109/ICACACT.2014.7223492","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223492","url":null,"abstract":"In every high voltage grid, the replacement of assets is a slow but steady process that guarantees long-term reliability of the power distribution networks. The prioritisation of such interventions is based on complex rating criteria specifically designed to highlight potential issues of certain machines (or families of machines) in need of care. Given the tremendous costs of operations such as the replacement of a power transformer it is not surprising to observe constant efforts devoted to finding new and better monitoring and diagnostic tools. These are capable of delivering invaluable information about the conditions of a transformer, in service or after it is either failed or proactively scrapped, allowing a better comprehension of underlying chemical-physical phenomena occurring. Ideally, advanced monitoring and diagnostic tools should ultimately result in improved rating parameters to be applied in the evaluation of future interventions. This feasibility study evaluates the use of static secondary ion mass spectrometry (SSIMS) molecular selective imaging as a diagnostic tool for power transformer. SSIMS is herein demonstrated to be able to assess, without doubts, the presence and integrity of the passivation layer produced by Irgamet®39 on copper surfaces in laboratory tests. The technique has also been tested on real samples collected from one of the phases of a 400/275kV autotransformer proactively scrapped and proved to be applicable without significant sample preparation. The possibility of its use in the study of the distribution of Irgamet®39 across the windings is also demonstrated. Further development of SSIMS as a diagnostic tool would be significantly increasing the grade of detail at which scrapped/failed units could be inspected. A better understanding on how the operating conditions or the design of a transformer can affect the anticorrosion protection layer at the molecular level would open the way to significant ad hoc improvements of both operative guidelines and rating criteria for power transformers","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114740363","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223581
X. Ye, M. Dhotre, J. Mantilla, S. Kotilainen
Gases and gas mixtures with lower environmental impact are being investigated as possible alternatives to SF6 as the switching medium in high voltage circuit breakers. One of the most important aspects of the investigation is the thermal interruption characteristic which depends on flow acceleration, and efficient cooling of the arc around current zero. In the present work, the influence of the gas properties on the thermal interruption capability is investigated using Computational Fluid Dynamics (CFD). A gas mixture of fluroketones with CO2 as background gas is considered. The underlying thermal interruptions behavior of this gas mixture is compared with that of SF6. The individual influence of the axial flow parameters namely pressure, velocity, Mach number and density on thermal interruption is studied. A thermal interruption proxy parameter is derived by combining the axial flow variables, which can better characterize the thermal interruption. The differences between the different gases using this proxy are presented. The design parameters influencing the pressure build-up and thermal interruption behavior are investigated and discussed.
{"title":"CFD analysis of the thermal interruption process of gases with low environmental impact in high voltage circuit breakers","authors":"X. Ye, M. Dhotre, J. Mantilla, S. Kotilainen","doi":"10.1109/ICACACT.2014.7223581","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223581","url":null,"abstract":"Gases and gas mixtures with lower environmental impact are being investigated as possible alternatives to SF6 as the switching medium in high voltage circuit breakers. One of the most important aspects of the investigation is the thermal interruption characteristic which depends on flow acceleration, and efficient cooling of the arc around current zero. In the present work, the influence of the gas properties on the thermal interruption capability is investigated using Computational Fluid Dynamics (CFD). A gas mixture of fluroketones with CO2 as background gas is considered. The underlying thermal interruptions behavior of this gas mixture is compared with that of SF6. The individual influence of the axial flow parameters namely pressure, velocity, Mach number and density on thermal interruption is studied. A thermal interruption proxy parameter is derived by combining the axial flow variables, which can better characterize the thermal interruption. The differences between the different gases using this proxy are presented. The design parameters influencing the pressure build-up and thermal interruption behavior are investigated and discussed.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126926868","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223497
R. Cselkó, B. Németh, G. Gõcsei, Denes Mucsi, I. Kiss
Dielectric tests performed on live line tools are essential to ensure the safety of the work. This paper shows some possible improvements to the standards defining measurements of insulating sticks and insulated boom aerial devices. Laboratory experiments and simulations were carried out on insulating sticks in order to evaluate various electrode arrangements applied in practice during voltage probe. In case of insulated boom aerial devices, calculations were performed to clarify the consistency of insulation resistance limits with other measurements and the dimensions of the insulating insert. The value added to the test by observing the temperature of the insulating insert during leakage current measurement has been assessed by a rough estimation of the temperature rise. The leakage current measurement with focus on the role of the stray capacitances has been evaluated based on the experience of the High Voltage Laboratory and theoretical considerations.
{"title":"Critical review of the dielectric testing of some live line tools","authors":"R. Cselkó, B. Németh, G. Gõcsei, Denes Mucsi, I. Kiss","doi":"10.1109/ICACACT.2014.7223497","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223497","url":null,"abstract":"Dielectric tests performed on live line tools are essential to ensure the safety of the work. This paper shows some possible improvements to the standards defining measurements of insulating sticks and insulated boom aerial devices. Laboratory experiments and simulations were carried out on insulating sticks in order to evaluate various electrode arrangements applied in practice during voltage probe. In case of insulated boom aerial devices, calculations were performed to clarify the consistency of insulation resistance limits with other measurements and the dimensions of the insulating insert. The value added to the test by observing the temperature of the insulating insert during leakage current measurement has been assessed by a rough estimation of the temperature rise. The leakage current measurement with focus on the role of the stray capacitances has been evaluated based on the experience of the High Voltage Laboratory and theoretical considerations.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134338915","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223485
R. Rampersad, Arvind Singh, S. Bahadoorsingh, C. Sharma
Power transformers are among the most critical and valuable assets in an electric utility. Their failure can compromise system security, reliability and result in load shedding. These factors coupled with the long lead times involved in replacement mean that condition based monitoring is fast becoming the norm for minimization of down time. Among the gamut of available test methods, Frequency Response Analysis (FRA) has become a cornerstone method in the appraisal of winding health. FRA is predominantly an offline test, requiring the transformer to be taken out of service, but the move toward a smarter grid continues to drive research into online testing. This paper details the development of a Simulink based toolbox for studying the problems associated with online FRA of power transformers. The toolbox includes various transformer circuit models and proposed online test configurations found in existing literature.
{"title":"Platform for studying online frequency response analysis of power transformers","authors":"R. Rampersad, Arvind Singh, S. Bahadoorsingh, C. Sharma","doi":"10.1109/ICACACT.2014.7223485","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223485","url":null,"abstract":"Power transformers are among the most critical and valuable assets in an electric utility. Their failure can compromise system security, reliability and result in load shedding. These factors coupled with the long lead times involved in replacement mean that condition based monitoring is fast becoming the norm for minimization of down time. Among the gamut of available test methods, Frequency Response Analysis (FRA) has become a cornerstone method in the appraisal of winding health. FRA is predominantly an offline test, requiring the transformer to be taken out of service, but the move toward a smarter grid continues to drive research into online testing. This paper details the development of a Simulink based toolbox for studying the problems associated with online FRA of power transformers. The toolbox includes various transformer circuit models and proposed online test configurations found in existing literature.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114198408","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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