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2011 IEEE International Conference on Dielectric Liquids最新文献

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Effect of side chains on the dielectric properties of alkyl esters derived from palm kernel oil 侧链对棕榈仁油烷基酯介电性能的影响
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015413
A. Abdelmalik, J. Fothergill, S. Dodd, A. Abbott, R. Harris
{"title":"Effect of side chains on the dielectric properties of alkyl esters derived from palm kernel oil","authors":"A. Abdelmalik, J. Fothergill, S. Dodd, A. Abbott, R. Harris","doi":"10.1109/ICDL.2011.6015413","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015413","url":null,"abstract":"Alkyl ester derivatives were synthesized from laboratory purified palm kernel oil. The steps in the synthesis involved transesterification of palm kernel oil to produce a methyl ester, followed by epoxidation and then the grafting of side chains by esterification with propionic and butyric anhydride. The dielectric and thermal properties of the ester derivatives were analyzed and compared with the methyl ester. The melting point of the ester derivatives were found to reduce with side chain attachment and antioxidant improved its thermal stability. The dielectric loss was dominated by mobile charged particles and the chemical modification appeared to increase the rate at which electric double layer was formed at the electrode-liquid interface. The esters possessed excellent breakdown strengths suggesting that the processing to optimize their physical properties did not have a negative influence on their electrical breakdown strength. This product may prove useful as an insulation fluid in Electrical Power Transformers.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131773705","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}
引用次数: 29
Breakdown strength of vegetable-based oils under AC and lightning impulse voltages 植物油在交流和雷击电压下的击穿强度
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015468
D. Vuković, S. Tenbohlen, J. Harthun, C. Perrier, H. Fink
{"title":"Breakdown strength of vegetable-based oils under AC and lightning impulse voltages","authors":"D. Vuković, S. Tenbohlen, J. Harthun, C. Perrier, H. Fink","doi":"10.1109/ICDL.2011.6015468","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015468","url":null,"abstract":"The breakdown strength of vegetable-based oil (VBO) and mineral oil is compared by means of experimental determination of breakdown voltage. These oils were tested under AC and positive lightning impulse voltages for uniform and non-uniform electrical field. The oil gap varied from 2 mm up to 85 mm. The results show same or higher AC breakdown strength of VBO compared to mineral oil for small gaps and uniform electrical field, whereas for lightning impulses and non-uniform field breakdown strength of VBO is reduced.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"228 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133300066","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}
引用次数: 20
Streak observation of DC pre-breakdown light in silicone oil / low-density polyethylene (LDPE) film composites using a long image guide scope 用长图像引导镜观察硅油/低密度聚乙烯(LDPE)薄膜复合材料直流预击穿光的条纹
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015460
A. I. Mohamed, Yuuji Miyamoto, M. Mori, K. Kadowaki
{"title":"Streak observation of DC pre-breakdown light in silicone oil / low-density polyethylene (LDPE) film composites using a long image guide scope","authors":"A. I. Mohamed, Yuuji Miyamoto, M. Mori, K. Kadowaki","doi":"10.1109/ICDL.2011.6015460","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015460","url":null,"abstract":"DC breakdown light of silicone oil and LDPE film composites between needle-sphere electrodes with the film placed on sphere electrode was observed using a streak camera. A long image guide scope (IGS) was attached to the streak camera as light delay path. This new system enables us to obtain a streak image of an initial process of the DC breakdown phenomena with a period of 10ns. Under positive polarity voltage, breakdown usually initiated from positive needle in all samples. Initiation of DC breakdown from film side was observed under negative polarity voltage condition.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123503043","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}
引用次数: 1
Experimental evaluation of water content determination in transformer oil by moisture sensor 水分传感器测定变压器油中含水量的实验评价
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015440
T. Gradnik, M. Koncan-Gradnik, N. Petric, N. Muc
{"title":"Experimental evaluation of water content determination in transformer oil by moisture sensor","authors":"T. Gradnik, M. Koncan-Gradnik, N. Petric, N. Muc","doi":"10.1109/ICDL.2011.6015440","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015440","url":null,"abstract":"Paper presents experimental research on temperature dependency of water solubility in mineral transformer oils. Moisture sensor measurements and absolute water content determination by Karl Fisher titration method were performed under controlled laboratory conditions to investigate solubility models of different types and conditions of mineral transformer oils. Results of experiments demonstrate that preset moisture solubility model of the moisture sensor affects accuracy of water content determination. Test setup and optimised procedure for verification and calibration of the moisture sensor with oil-specific solubility parameters is described, tested and evaluated. This allows higher accuracy of on-line water content monitoring in operating transformers under changing temperature conditions.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129803522","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}
引用次数: 20
The effect of insulation oil on the electrical and dielectric properties of epoxy resin 绝缘油对环氧树脂电性能和介电性能的影响
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015487
M. M. Saei Shirazi, H. Borsi, E. Gockenbach
{"title":"The effect of insulation oil on the electrical and dielectric properties of epoxy resin","authors":"M. M. Saei Shirazi, H. Borsi, E. Gockenbach","doi":"10.1109/ICDL.2011.6015487","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015487","url":null,"abstract":"It is well known that thermal and electrical stresses have a strong influence on the degradation of insulation, but the effect of insulation oil is not yet well analysed. There are different electrical apparatus operating with insulation oil as cooling system and epoxy resin as the insulation system. So it is very important to be cleared, how the oil will affect the electrical and dielectric properties of the solid insulation material.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130883942","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}
引用次数: 1
Coupled inductive sensors for monitoring the pH of electrolyte solutions 用于监测电解质溶液pH值的耦合电感传感器
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015486
Siavash Saremi-Yarahmadi, K. Fobelets, C. Toumazou
{"title":"Coupled inductive sensors for monitoring the pH of electrolyte solutions","authors":"Siavash Saremi-Yarahmadi, K. Fobelets, C. Toumazou","doi":"10.1109/ICDL.2011.6015486","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015486","url":null,"abstract":"Variations of the coupling between two inductors in the presence of a strong electrolyte with varying pH value is investigated. Inductors were placed at a distance of 15.875 mm apart. S12 parameters were measured and used as an indicator to the strength of coupling between the two inductors. The pH of the electrolyte solution was reduced from 4.2 to 0.2, A shift of 3.5 MHz in the frequency at which maximum coupling occurs was observed for the corresponding pH change. The system was also simulated using a Finite Element package. A discussion on the relevance of the simulated data and experimental values is offered. The design discussed in this paper has the potential of being used in monitoring conductive electrolyte solutions and qualitative monitoring of chemical reactions.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121622187","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}
引用次数: 1
Dependence of the electrohydrodynamic flows structure in very non-uniform electric field on the charge formation mechanism 非均匀电场中电流体流动结构与电荷形成机理的关系
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015482
Y. Stishkov, V. Chirkov
{"title":"Dependence of the electrohydrodynamic flows structure in very non-uniform electric field on the charge formation mechanism","authors":"Y. Stishkov, V. Chirkov","doi":"10.1109/ICDL.2011.6015482","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015482","url":null,"abstract":"A comparison of the steady-state electrohydrodynamic (EHD) flows structure in the needle-plane electrode system is carried out on the basis of the computer simulation results for injection and dissociation models of charge formation. The numerical computations of the EHD equations are performed with the software COMSOL Multiphysics 3.5 based on the finite element method. Part of the data obtained in the simulation is compared with the experimental ones to confirm the correctness of the proposed simulation method. Characteristic features of the flow structure are revealed for each mechanism of charge formation and some recommendations on the liquid choice for applied EHD device based on the discovered structure are given.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"5 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120920909","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}
引用次数: 12
Charge behavior in Palm Fatty Acid Ester Oil (PFAE) / Pressboard composite insulation system with charged oil flow 棕榈脂肪酸酯油(PFAE) /纸板复合绝缘系统中带电油流的带电行为
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015445
H. Saito, H. Okubo, H. Kojima, N. Hayakawa, K. Kato, K. Kawanishi, H. Koide
{"title":"Charge behavior in Palm Fatty Acid Ester Oil (PFAE) / Pressboard composite insulation system with charged oil flow","authors":"H. Saito, H. Okubo, H. Kojima, N. Hayakawa, K. Kato, K. Kawanishi, H. Koide","doi":"10.1109/ICDL.2011.6015445","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015445","url":null,"abstract":"Palm Fatty Acid Ester Oil (PFAE) is expected as one of the substitutes for mineral oil of transformers owing to not only the high biodegradation but also the good insulation performance. In this paper, the electric field strength and its time transition in PFAE / Pressboard composite insulation system??under charged oil flow were directly measured by using Kerr electro-optic technique. We found that the electric field was generated by space charges in PFAE and was temporally changed with charge behavior. By comparison with high charging mineral oil, we clarified that the feature of the charge behavior in PFAE was similar to that in the mineral oil, but the behavior of electric field was different due to the variation of electric properties such as permittivity, relaxing time and charge density.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121235270","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}
引用次数: 4
Influence of the characteristic parameters on flow patterns and heat transfer in electro-thermo-convection 特征参数对电-热对流流态和传热的影响
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015483
Koulova Dantchi, Traore Philippe, R. Hubert, Louste Christophe
{"title":"Influence of the characteristic parameters on flow patterns and heat transfer in electro-thermo-convection","authors":"Koulova Dantchi, Traore Philippe, R. Hubert, Louste Christophe","doi":"10.1109/ICDL.2011.6015483","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015483","url":null,"abstract":"We study the electro-thermo-convective phenomena in a dielectric liquid layer of depth H placed between two electrodes and subjected to the simultaneous action of an electric field and a thermal gradient. The full set of governing equations is directly solved using a finite volume method. In this paper we first heat from the lower electrode and apply the electric potential when the thermal steady state is obtained. Only the case of strong injection of electric charges is considered. The flow pattern and Nusselt number strongly depend on the following non dimensional characteristic parameters: electrical parameter T, Rayleigh number Ra, Prandtl number Pr and mobility parameter M. The electro-convective flow structure is analysed in a rectangular cavity of length 2H, where the pure thermo-convection gives rise to two rolls whereas the pure electro-convection (with injection) gives a four roll pattern. The combined effect of both electric and thermal field on the flow patterns and on Nusselt number is analyzed for different values of Pr and M.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127781516","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}
引用次数: 3
Electrocoalescence of water drops in oil shear flow: Development of an experimental set up 油剪切流中水滴的电聚结:实验装置的研制
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015470
J. Raisin, J. Reboud, P. Atten
{"title":"Electrocoalescence of water drops in oil shear flow: Development of an experimental set up","authors":"J. Raisin, J. Reboud, P. Atten","doi":"10.1109/ICDL.2011.6015470","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015470","url":null,"abstract":"Present research aims at determining the conditions leading to electrocoalescence of water drops in oil flows and at characterizing the interplay between fluid dynamics and electric field in the mechanism. We describe here the build-up of an experimental set-up designed to investigate the critical coalescence conditions in the case of two free water droplets in an oil shear flow under the action of an applied electric field. Drop pairs will be injected in a Poiseuille flow to study, by optical means, their relative motion, deformation and possible coalescence. Important part of this preliminary work concerns the injection of controlled charge free drop pairs using a newly developed EHD actuation technique. Second paper [1] deals with theoretical and numerical analyses in the same configuration.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134320422","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}
引用次数: 9
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