Pub Date : 2014-09-08DOI: 10.1109/ICDL.2014.6893128
Lei Yang, M. Talmor, J. Seyed-Yagoobi
Electrohydrodynamic (EHD) pumping based on the electric conduction mechanism shows a great promise for space and terrestrial applications. This paper experimentally investigates the effect of working fluid temperature on the performance of the EHD conduction pumping. A brief fundamental explanation is also included to address the observed trend.
{"title":"Effect of temperature on electrohydrodynamic conduction pumping performance","authors":"Lei Yang, M. Talmor, J. Seyed-Yagoobi","doi":"10.1109/ICDL.2014.6893128","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893128","url":null,"abstract":"Electrohydrodynamic (EHD) pumping based on the electric conduction mechanism shows a great promise for space and terrestrial applications. This paper experimentally investigates the effect of working fluid temperature on the performance of the EHD conduction pumping. A brief fundamental explanation is also included to address the observed trend.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"68 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84145414","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 : 2014-06-30DOI: 10.1109/ICDL.2014.6893154
M. Hao, Yuan Zhou, George Chen, G. Wilson, P. Jarman
Dielectric performance of oil-pressboard insulation system used in high voltage direct current (HVDC) convertor transformers can be affected by the presence of space charge. In this paper, the space charge behaviors in a 0.5mm thick oil film combined with a 1mm thick impregnated pressboard have been investigated by the pulsed electroacoustic (PEA) technique under 12kV/mm and 20kV/mm at room temperature. Two types of oil with different aging status were used for comparison. The results show that a charge peak is quickly formed at the interface between oil and pressboard with the same polarity as the electrode at the oil film side. However, the dynamics of the interfacial charges are very different for fresh oil and aged oil samples. The maximum electric field occurs in the middle of the pressboard, which is significantly enhanced in the aged oil samples. Difference in the electric field between those obtained from measurement results and those calculated from Maxwell-Wagner theory has been discussed.
{"title":"Space charge behaviour in oil and impregnated pressboard combined insulation system","authors":"M. Hao, Yuan Zhou, George Chen, G. Wilson, P. Jarman","doi":"10.1109/ICDL.2014.6893154","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893154","url":null,"abstract":"Dielectric performance of oil-pressboard insulation system used in high voltage direct current (HVDC) convertor transformers can be affected by the presence of space charge. In this paper, the space charge behaviors in a 0.5mm thick oil film combined with a 1mm thick impregnated pressboard have been investigated by the pulsed electroacoustic (PEA) technique under 12kV/mm and 20kV/mm at room temperature. Two types of oil with different aging status were used for comparison. The results show that a charge peak is quickly formed at the interface between oil and pressboard with the same polarity as the electrode at the oil film side. However, the dynamics of the interfacial charges are very different for fresh oil and aged oil samples. The maximum electric field occurs in the middle of the pressboard, which is significantly enhanced in the aged oil samples. Difference in the electric field between those obtained from measurement results and those calculated from Maxwell-Wagner theory has been discussed.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"85 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73560747","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 : 2014-06-30DOI: 10.1109/ICDL.2014.6893110
I. Hosier, H. Ma, A. Vaughan
The electrical and thermal ageing behavior of silicone oil was considered in these investigations. The two ageing methods had very different physical effects; electrical ageing resulted in darkening of the oils but with no gelling (increased viscosity), whereas thermal ageing did not produce darkening but could produce gelling. Whilst ageing tended to reduce the AC breakdown strength and increased the electrical conductivity, one set of thermally aged oils, whose viscosity increased after thermal ageing, exhibited increased breakdown strength. The unexpected effects of oil viscosity on AC breakdown strength were confirmed in separate experiments on an oil of a higher viscosity.
{"title":"Effect of electrical and thermal ageing on the breakdown strength of silicone oil","authors":"I. Hosier, H. Ma, A. Vaughan","doi":"10.1109/ICDL.2014.6893110","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893110","url":null,"abstract":"The electrical and thermal ageing behavior of silicone oil was considered in these investigations. The two ageing methods had very different physical effects; electrical ageing resulted in darkening of the oils but with no gelling (increased viscosity), whereas thermal ageing did not produce darkening but could produce gelling. Whilst ageing tended to reduce the AC breakdown strength and increased the electrical conductivity, one set of thermally aged oils, whose viscosity increased after thermal ageing, exhibited increased breakdown strength. The unexpected effects of oil viscosity on AC breakdown strength were confirmed in separate experiments on an oil of a higher viscosity.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"23 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82746857","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 : 2014-06-29DOI: 10.1109/ICDL.2014.6893156
S. Matharage, Q. Liu, E. Davenport, G. Wilson, D. Walker, Z. Wang
Paper ageing is an irreversible process, which has made paper insulation a lifetime determining factor for transformers. Chemical indicators in oil such as carbon oxide gases and 2-FAL, are used to indicate the ageing state of paper as it is difficult to obtain paper samples to measure DP or tensile strength. Methanol amount in oil was recently found to be an early-ageing indicator for paper. In this study, a headspace gas chromatography mass spectrometry setup was developed to measure methanol in transformer oil. This setup consists of an auto sampler with a gas tight syringe, a gas chromatography unit with 60 m VF-624ms column and a quadrupole ion trap type mass spectrometer unit. Measurement of several laboratory-aged and service-aged oil samples were conducted with both external standard and internal standard calibration methods. Higher methanol values obtained from internal standard method confirmed that it is more suitable than external standard method.
纸张老化是一个不可逆的过程，这使得纸张绝缘成为变压器寿命的决定因素。油中的化学指标，如二氧化碳气体和2-FAL，用于指示纸张的老化状态，因为很难获得纸张样品来测量DP或拉伸强度。最近发现，油中甲醇的含量是纸张的早期老化指标。本研究建立了顶空气相色谱质谱法测定变压器油中甲醇的方法。该装置包括一个带有气密注射器的自动进样器，一个带有60 m VF-624ms柱的气相色谱单元和一个四极离子阱型质谱仪单元。采用外标和内标两种校准方法对几种实验室老化和服役老化油样进行了测量。内标法测得的甲醇值较高，证实了内标法比外标法更适用。
{"title":"Methanol detection in transformer oils using gas chromatography and ion trap mass spectrometer","authors":"S. Matharage, Q. Liu, E. Davenport, G. Wilson, D. Walker, Z. Wang","doi":"10.1109/ICDL.2014.6893156","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893156","url":null,"abstract":"Paper ageing is an irreversible process, which has made paper insulation a lifetime determining factor for transformers. Chemical indicators in oil such as carbon oxide gases and 2-FAL, are used to indicate the ageing state of paper as it is difficult to obtain paper samples to measure DP or tensile strength. Methanol amount in oil was recently found to be an early-ageing indicator for paper. In this study, a headspace gas chromatography mass spectrometry setup was developed to measure methanol in transformer oil. This setup consists of an auto sampler with a gas tight syringe, a gas chromatography unit with 60 m VF-624ms column and a quadrupole ion trap type mass spectrometer unit. Measurement of several laboratory-aged and service-aged oil samples were conducted with both external standard and internal standard calibration methods. Higher methanol values obtained from internal standard method confirmed that it is more suitable than external standard method.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"12 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88504793","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 : 2014-06-29DOI: 10.1109/ICDL.2014.6893169
Li Shiyan, Zhao Tao, L. Yunpeng, Li Yansong, Liu Qiang
In the light of the characteristics of DC partial discharge, a set of typical DC partial discharge simulation model in the converter transformer was designed and built. This paper applies non-electrical measuring methods :ultrasonic sensor and photoelectric detection means such as photomultiplier tube (PMT) to test the partial discharge signals. Non-electrical measuring methods have strong ability of resistance to electromagnetic interference. The test results show that the ultrasonic sensor detect the real-time changes of the signal effectively, and the overall trend of the average largest amplitude of ultrasonic pulse will rise with the voltage increases, but the duration and the intensity of each signal may not be detected effectively by this means. However, PMT can be used to detect the intensity of amplitude of the signal under different voltage, and can monitoring the discharge duration sensitively. PMT can be used to measure the amplitude of initial discharge voltage and the initial discharge development time. Its measurement data can provide basis for the optimization of converter transformer insulation structure.
{"title":"Detections of ultrasonic sensor and PMT on partial discharge in oil under DC voltage","authors":"Li Shiyan, Zhao Tao, L. Yunpeng, Li Yansong, Liu Qiang","doi":"10.1109/ICDL.2014.6893169","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893169","url":null,"abstract":"In the light of the characteristics of DC partial discharge, a set of typical DC partial discharge simulation model in the converter transformer was designed and built. This paper applies non-electrical measuring methods :ultrasonic sensor and photoelectric detection means such as photomultiplier tube (PMT) to test the partial discharge signals. Non-electrical measuring methods have strong ability of resistance to electromagnetic interference. The test results show that the ultrasonic sensor detect the real-time changes of the signal effectively, and the overall trend of the average largest amplitude of ultrasonic pulse will rise with the voltage increases, but the duration and the intensity of each signal may not be detected effectively by this means. However, PMT can be used to detect the intensity of amplitude of the signal under different voltage, and can monitoring the discharge duration sensitively. PMT can be used to measure the amplitude of initial discharge voltage and the initial discharge development time. Its measurement data can provide basis for the optimization of converter transformer insulation structure.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"77 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2014-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74811468","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 : 2014-06-29DOI: 10.1109/ICDL.2014.6893074
Huifei Jin, P. Morshuis, A. Mor, T. Andritsch
Recent studies present a model which assumes that conductive nanoparticles can reduce the speed of the positive streamer propagation in mineral oil due to electron trapping at the particle surface. Time resolved partial discharge measurements can be used to evaluate the discharge dynamics and to verify this hypothesis. A special measurement setup was built to enable the recording of the discharge dynamics. In this study, the effect of nanoparticles with different conductivities on the discharge dynamics of mineral oil is investigated. The time resolved current shapes of partial discharges in nanofluids and mineral oil are compared. To understand the effect of the conductivity of the nanoparticles on the partial discharge dynamics of mineral oil, nanoparticles with two different conductivities are synthesized with mineral oil. The two types of nanoparticles are silica and fullerene. The host fluid used in this study is Shell DialaS3ZXIG mineral oil.
{"title":"An investigation into the dynamics of partial discharge propagation in mineral oil based nanofluids","authors":"Huifei Jin, P. Morshuis, A. Mor, T. Andritsch","doi":"10.1109/ICDL.2014.6893074","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893074","url":null,"abstract":"Recent studies present a model which assumes that conductive nanoparticles can reduce the speed of the positive streamer propagation in mineral oil due to electron trapping at the particle surface. Time resolved partial discharge measurements can be used to evaluate the discharge dynamics and to verify this hypothesis. A special measurement setup was built to enable the recording of the discharge dynamics. In this study, the effect of nanoparticles with different conductivities on the discharge dynamics of mineral oil is investigated. The time resolved current shapes of partial discharges in nanofluids and mineral oil are compared. To understand the effect of the conductivity of the nanoparticles on the partial discharge dynamics of mineral oil, nanoparticles with two different conductivities are synthesized with mineral oil. The two types of nanoparticles are silica and fullerene. The host fluid used in this study is Shell DialaS3ZXIG mineral oil.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"100 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76078480","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 : 2014-06-29DOI: 10.1109/ICDL.2014.6893155
Z. Liu, Q. Liu, Z. Wang, P. Jarman, C. Krause, P. W. R. Smith, A. Gyore
This study investigated the partial discharge (PD) behaviour of a mineral oil Gemini X, a synthetic ester Midel 7131 and a Gas-To-Liquid (GTL) based synthetic hydrocarbon liquid Diala S4 ZX-I, and examined how their PD behaviour can be affected by moisture. Measurements of PD inception voltage (PDIV), PD magnitude represented by maximum apparent charge and PD number represented by pulse repetition rate of dry and moist liquids were compared. Results indicate that the PD magnitude of Midel 7131 is higher than the other two liquids at the same voltage. At voltages higher than PDIV, those liquids exhibit rather different pulse repetition rates. Midel 7131 has a higher pulse repetition rate than the other two liquids at the same voltage. As a result of increasing the relative moisture content of the liquid samples to 50%, it has been observed that the pulse repetition rates of both Gemini X and Diala S4 ZX-I increase, however, in contrast, that of Midel 7131 decreases.
{"title":"Partial discharge behaviour of transformer liquids and the influence of moisture content","authors":"Z. Liu, Q. Liu, Z. Wang, P. Jarman, C. Krause, P. W. R. Smith, A. Gyore","doi":"10.1109/ICDL.2014.6893155","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893155","url":null,"abstract":"This study investigated the partial discharge (PD) behaviour of a mineral oil Gemini X, a synthetic ester Midel 7131 and a Gas-To-Liquid (GTL) based synthetic hydrocarbon liquid Diala S4 ZX-I, and examined how their PD behaviour can be affected by moisture. Measurements of PD inception voltage (PDIV), PD magnitude represented by maximum apparent charge and PD number represented by pulse repetition rate of dry and moist liquids were compared. Results indicate that the PD magnitude of Midel 7131 is higher than the other two liquids at the same voltage. At voltages higher than PDIV, those liquids exhibit rather different pulse repetition rates. Midel 7131 has a higher pulse repetition rate than the other two liquids at the same voltage. As a result of increasing the relative moisture content of the liquid samples to 50%, it has been observed that the pulse repetition rates of both Gemini X and Diala S4 ZX-I increase, however, in contrast, that of Midel 7131 decreases.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"21 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79111982","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 : 2014-06-01DOI: 10.1109/ICDL.2014.6893126
K. Yoshino, R. Ozaki, H. Moritake
The viscosity properties of an electrolyte solution, which consists of 1-methyl-3-propylimidazolium iodide (MPI-I) as an electrolyte and ethylisopropylsulfone (EiPS) as a solvent, using the shear horizontal (SH) wave device are investigated. The viscosities with several concentrations of the electrolyte in solutions are measured and the viscosity increases with increasing concentration of the electrolyte. The viscosity increases with increasing applied voltage and depends on not applied voltage but allied electric field. Moreover, the relation between viscosity and electrolyte concentration is clarified.
{"title":"Properties of electrolyte solutions and ionic liquids in thin cells studied using shear horizontal wave","authors":"K. Yoshino, R. Ozaki, H. Moritake","doi":"10.1109/ICDL.2014.6893126","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893126","url":null,"abstract":"The viscosity properties of an electrolyte solution, which consists of 1-methyl-3-propylimidazolium iodide (MPI-I) as an electrolyte and ethylisopropylsulfone (EiPS) as a solvent, using the shear horizontal (SH) wave device are investigated. The viscosities with several concentrations of the electrolyte in solutions are measured and the viscosity increases with increasing concentration of the electrolyte. The viscosity increases with increasing applied voltage and depends on not applied voltage but allied electric field. Moreover, the relation between viscosity and electrolyte concentration is clarified.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"40 12 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83186138","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 : 2014-06-01DOI: 10.1109/ICDL.2014.6893118
S. Fink, R. Mueller, M. Noe, V. Zwecker, H.R. Kim
Liquid nitrogen is often used in superconducting high voltage apparatus for cooling and for electrical insulation purposes. A temperature increase of the superconductor surface, e. g. to room temperature during a quench of a fault current limiter, may cause a decrease of the breakdown voltage within the apparatus by generation of nitrogen gas bubbles. A cryostat was equipped with a sphere to plane electrode arrangement with adjustable gap for the examination of the breakdown and withstand voltages of liquid nitrogen. Bubble generation of the heatable plane was verified by camera observation. Alternating voltage up to 230 kVrms was applied to the arrangement under the pressure condition of 0.1 MPa (absolute). Degradation of the withstand voltage up to 50% was found by using a 500 W heater in comparison to the case with no heating.
{"title":"Withstand alternating voltage of liquid nitrogen in the presence of gas bubbles","authors":"S. Fink, R. Mueller, M. Noe, V. Zwecker, H.R. Kim","doi":"10.1109/ICDL.2014.6893118","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893118","url":null,"abstract":"Liquid nitrogen is often used in superconducting high voltage apparatus for cooling and for electrical insulation purposes. A temperature increase of the superconductor surface, e. g. to room temperature during a quench of a fault current limiter, may cause a decrease of the breakdown voltage within the apparatus by generation of nitrogen gas bubbles. A cryostat was equipped with a sphere to plane electrode arrangement with adjustable gap for the examination of the breakdown and withstand voltages of liquid nitrogen. Bubble generation of the heatable plane was verified by camera observation. Alternating voltage up to 230 kVrms was applied to the arrangement under the pressure condition of 0.1 MPa (absolute). Degradation of the withstand voltage up to 50% was found by using a 500 W heater in comparison to the case with no heating.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"36 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77312267","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 : 2014-06-01DOI: 10.1109/ICDL.2014.6893113
V. Chirkov, Y. Stishkov, A. Sitnikov
The paper presents the technique for computing current-time characteristics of the transient regime, taking place after the pulsed application or change of high voltage, and current-voltage ones obtained with the voltage sawtooth modulation. The basis of the simulation is the complete set of electrohydrodynamic equations with both the convective and the migration mechanisms of charge transport being taken into account jointly. The numerical calculations were performed using commercial software package COMSOL Multiphysics based on the finite element method. The simulation was carried out for the needle-plane electrode system. The unsteady-state current passage processes, including electrohydrodynamic flow formation, were calculated. The interrelation between the latter and the total current passing through the electrical circuit were investigated. The shape and features of the current-voltage characteristics obtained with the voltage sawtooth modulation were shown to be dependent on the mechanism of charge formation. The qualitative comparison between the simulated and the original experimental data has shown a good agreement.
{"title":"Integral electric current characteristics of unsteady-state processes of current passage through liquid dielectrics","authors":"V. Chirkov, Y. Stishkov, A. Sitnikov","doi":"10.1109/ICDL.2014.6893113","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893113","url":null,"abstract":"The paper presents the technique for computing current-time characteristics of the transient regime, taking place after the pulsed application or change of high voltage, and current-voltage ones obtained with the voltage sawtooth modulation. The basis of the simulation is the complete set of electrohydrodynamic equations with both the convective and the migration mechanisms of charge transport being taken into account jointly. The numerical calculations were performed using commercial software package COMSOL Multiphysics based on the finite element method. The simulation was carried out for the needle-plane electrode system. The unsteady-state current passage processes, including electrohydrodynamic flow formation, were calculated. The interrelation between the latter and the total current passing through the electrical circuit were investigated. The shape and features of the current-voltage characteristics obtained with the voltage sawtooth modulation were shown to be dependent on the mechanism of charge formation. The qualitative comparison between the simulated and the original experimental data has shown a good agreement.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"9 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87432613","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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