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2011 IEEE International Conference on Dielectric Liquids最新文献

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Copper dissolution and deposition tendency of insulating mineral oils related to dielectric properties of liquid and solid insulation 绝缘矿物油中铜的溶解和沉积趋势与液体和固体绝缘的介电性能有关
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015423
R. Maina, V. Tumiatti, M. C. Bruzzoniti, R. M. De Carlo, J. Lukić, D. Naumovic-Vukovic
{"title":"Copper dissolution and deposition tendency of insulating mineral oils related to dielectric properties of liquid and solid insulation","authors":"R. Maina, V. Tumiatti, M. C. Bruzzoniti, R. M. De Carlo, J. Lukić, D. Naumovic-Vukovic","doi":"10.1109/ICDL.2011.6015423","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015423","url":null,"abstract":"Mineral oils may react with the copper conductors in oil impregnated transformers, leading both to the formation of dissolved and suspended copper in the oil and to the deposition of copper onto the paper surface of the solid insulation. Available standard methods for copper detection in mineral oil may not be fully effective in assessing the total copper content. Dissolved and suspended copper species in the oil are shown to affect oil's losses to a different extent.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"135 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":"131887012","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: 8
Experimental determination of space charge density at solid-liquid interface versus temperature: Application to oil flow electrification in power transformers 固液界面空间电荷密度随温度变化的实验测定:在电力变压器油流通电中的应用
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015431
Zelu Yan, G. Morin, T. Paillat
{"title":"Experimental determination of space charge density at solid-liquid interface versus temperature: Application to oil flow electrification in power transformers","authors":"Zelu Yan, G. Morin, T. Paillat","doi":"10.1109/ICDL.2011.6015431","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015431","url":null,"abstract":"A liquid in contact with a solid induces the development of an electrical double layer. Flow electrification is due to the convection by the liquid flow of electrical charges coming from the electrical double layer. The aim of this work is to determine experimentally the space charge density at the wall for a fully developed double layer, and its evolution with temperature. A new experimental method based on current measurements as function of rest time is used to determine this parameter. The experimental set up simulates a power transformer with pressboard and oil as electrical insulation, and where convection of the oil is used for cooling purposes. The flow electrification phenomenon is suspected to be at the origin of electrostatic damages.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"30 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":"129493797","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: 0
Study on flow electrification hazards with ester oils 酯类油流动带电危害的研究
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015404
Y. Zelu, T. Paillat, G. Morin, C. Perrier, M. Saravolac
{"title":"Study on flow electrification hazards with ester oils","authors":"Y. Zelu, T. Paillat, G. Morin, C. Perrier, M. Saravolac","doi":"10.1109/ICDL.2011.6015404","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015404","url":null,"abstract":"Mineral oils are commonly used for cooling and electrical insulation purposes in electrical power transformers. Nevertheless, these oils are especially problematic for the environment in the case of burning and leakage. Thanks to their higher fire point and excellent biodegradability, ester oils could be a good candidate to replace mineral oils. Thus, some transformer manufacturers have launched investigations by filling medium power transformers with ester oils and especially natural ester oils.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"22 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":"125734037","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: 18
Accumulative effect on streamer propagation of lightning impulses on oil/pressboard interface 油压界面上雷电脉冲流光传播的累积效应
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015432
Q. Liu, Z.D. Wang, P. Dyer, D. Walker
{"title":"Accumulative effect on streamer propagation of lightning impulses on oil/pressboard interface","authors":"Q. Liu, Z.D. Wang, P. Dyer, D. Walker","doi":"10.1109/ICDL.2011.6015432","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015432","url":null,"abstract":"This paper reports the accumulative effect of multiple negative lightning impulse shots on streamer propagation along liquid/pressboard surface. Pressboards impregnated with the insulating liquids including a mineral oil, a natural ester and a synthetic ester were tested under a point-plane divergent field. Streamer propagation was recorded by a high speed intensified CCD camera. In addition, current and light signals were monitored by non-inductive current shunt and photo multiplier tube (PMT) respectively. It was found that with 60 s time interval between consecutive shots a streamer along mineral oil/pressboard interface advances itself following each shot and could eventually lead to flashover in a multiple-shot test, while streamers on ester/pressboard interface seem uninfluenced by the accumulative stresses.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"7 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":"130868455","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: 14
Comparative study of statistical breakdown in mineral, synthetic and natural ester oils under AC voltage 矿物油、合成油和天然酯油在交流电压下统计击穿的比较研究
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015408
V. Dang, A. Beroual, C. Perrier
{"title":"Comparative study of statistical breakdown in mineral, synthetic and natural ester oils under AC voltage","authors":"V. Dang, A. Beroual, C. Perrier","doi":"10.1109/ICDL.2011.6015408","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015408","url":null,"abstract":"This paper reports on a comparative study of statistical Breakdown Voltage (BDV) in mineral oils, natural esters (vegetable oils) issued from different origins, and one synthetic ester through the measurements of 32 BDV using spherical electrode under AC voltage according to main lines of IEC 60156 specifications. The Normal and Weibull distribution functions are used to analyze and estimate the BDV probability of these oils. The hypothesis testing is then used to select the distribution functions suitability. We mainly analyze the histogram, frequency, mean, standard deviation and estimate the BDV probability of the sample population. The considered liquids are three different mineral oils (MO3', MO4' and MO5), one synthetic ester (SE1) and three different natural esters (VO2, VO3 and VO4). All oil samples were new and treated. It's shown that the measured BDV data follow better Normal than Weibull distribution. Basing on the BDV at the levels of risk 1% and 50% probability for U1% and U50%, the dielectric strength of ester oils, under AC, homogeneous field and small gap, is slightly better compared to mineral oils.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"118 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":"134042373","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: 16
Dielectric properties of nanopowder emulsions in paraffin oil 纳米粉末乳剂在石蜡油中的介电性能
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015449
J. A. Mergos, M. D. Athanassopoulou, T. Argyropoulos, C. Dervos
{"title":"Dielectric properties of nanopowder emulsions in paraffin oil","authors":"J. A. Mergos, M. D. Athanassopoulou, T. Argyropoulos, C. Dervos","doi":"10.1109/ICDL.2011.6015449","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015449","url":null,"abstract":"This work investigates polarization phenomena induced by nanoparticle inclusions in paraffin oil, an insulating organic liquid. Fine metal oxide powders and nanopowders of Al2O3, TiO2, CuO, Cu2O and Fe2O3 were tested at concentrations up to 5% w/v in the liquid matrix. Emulsification was attained by ultrasound treatment. The relative dielectric constant and loss tangent (tand) of both pure oil and emulsions were recorded in the 20 Hz–1 MHz frequency range. Results depend both on grain size and on the specific compound. In the case of alumina nanoparticles, dielectric behavior is dominated by grain surface polarization phenomena induced by adsorbed water. This effect can be partially cancelled out by the addition of titania nanoparticles. Titanium and (to a lesser extent) ferric oxide increased the dielectric constant at middle and high frequencies. Copper (I) and (II) oxides exhibit a distinct relaxation mechanism at the high end of the frequency range.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"57 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":"128261731","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: 2
Modeling the inter-phase region of high voltage transformers 高压变压器相间区域的建模
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015422
H. Zainuddin, P. Lewin, P. M. Mitchinson
{"title":"Modeling the inter-phase region of high voltage transformers","authors":"H. Zainuddin, P. Lewin, P. M. Mitchinson","doi":"10.1109/ICDL.2011.6015422","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015422","url":null,"abstract":"In large oil-filled power transformers, pressboard and paper in conjunction with oil are used throughout to provide electrical insulation. Microscopic views have shown that pressboard insulation is a fibrous and porous structure with a non-homogeneous surface. The porosity of pressboard can result in impurities within the oil being drawn into the oil-impregnated pressboard. The material properties and geometry of pressboard thus lead to a complex oil-pressboard interface. A 2-D model of oil-pressboard interface considering the porous and non-homogeneous of pressboard has been constructed using Finite Element Analysis software, COMSOL Multiphysics. This paper discusses the mathematical equations used to study the electric double layer (EDL) at the oil-pressboard interface where the oil is in a stationary condition. Subsequently, the simulation results of non-equilibrium charge density profile at the interface are also presented.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"8 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":"134221455","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
Conductivity measurements of electrical insulating oils 电绝缘油的导电性测量
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015456
T. Judendorfer, A. Pirker, M. Muhr
{"title":"Conductivity measurements of electrical insulating oils","authors":"T. Judendorfer, A. Pirker, M. Muhr","doi":"10.1109/ICDL.2011.6015456","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015456","url":null,"abstract":"Mineral oils play - in combination with cellulose (paper and pressboard), a vital part in the insulation system of large transformers and bushings. The dielectric stress within such insulation systems during high voltage direct current (HVDC) network operation is defined by a mixed stress that consists of AC, DC and transient components. Exemplary, the valve winding of converter transformers is to be named here.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"27 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":"132821898","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: 30
Preliminary experimental results on water breakdown in tens nanoseconds region 几十纳秒范围内水分解的初步实验结果
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015427
Jingming Gao, Yong-gui Liu, T. Xun, Jinliang Liu, Jianhua Yang
{"title":"Preliminary experimental results on water breakdown in tens nanoseconds region","authors":"Jingming Gao, Yong-gui Liu, T. Xun, Jinliang Liu, Jianhua Yang","doi":"10.1109/ICDL.2011.6015427","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015427","url":null,"abstract":"Deionized water is a good dielectric material. In this paper, preliminary investigations are carried out on water breakdown in tens nanoseconds region via a switch with “point-plane” electrodes. The switch is set up on the output port of a wave erection Marx generator, which can deliver a minus high voltage pulse with an amplitude of 0∼300 kV, and a pulse width of 40∼50 ns to a matched load. According to the experimental results, the breakdown electric field is calculated to be about 1.2 MV/cm by Martin's formula. A circuit model for the whole system is built utilizing PSpice software, and the simulation results agree with the experimental ones basically.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"1 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":"121992212","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
Cole-cole diagram as diagnostic tool for dielectric liquids 作为介电液体诊断工具的科尔-科尔图
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015448
S. Martin, M. Vaclav, T. Pavel, Bocek Jiri, P. Josef, M. Petr
{"title":"Cole-cole diagram as diagnostic tool for dielectric liquids","authors":"S. Martin, M. Vaclav, T. Pavel, Bocek Jiri, P. Josef, M. Petr","doi":"10.1109/ICDL.2011.6015448","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015448","url":null,"abstract":"Dielectric subsystems have an important influence on reliability, lifetime and power of electrical equipments. Study of dielectric parameters and their changes due to degradation mechanisms provide important information about the equipments. Paper deals with oil-paper systems and their thermal degradation. These systems are used for example in transformer, capacitors and bushings. Thermal degradation causes increasing of moisture content thus number of polar particles. Therefore the main idea of this paper is diagnostic of oil-paper insulation based on a method of polarization measurement. One of the methods is Cole-Cole diagram [1] or its modification e.g. Davidson [5], Havriliak-Negami [11]. The next aim of the paper is measurement of the system parameters (Complex permittivity, Viscosity, Acid value, Resistivity, Polarization index and Dissipation factor) and their changes due to thermal degradation. In experiments are used a normal and an environmental friendly fluid.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"26 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":"122028893","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
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