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2011 IEEE International Conference on Dielectric Liquids最新文献

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Investigation on the surface discharge phenomenon at the oil-pressboard interface 油压板界面表面放电现象的研究
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015439
H. Zainuddin, P. M. Mitchinson, P. Lewin
{"title":"Investigation on the surface discharge phenomenon at the oil-pressboard interface","authors":"H. Zainuddin, P. M. Mitchinson, P. Lewin","doi":"10.1109/ICDL.2011.6015439","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015439","url":null,"abstract":"Surface discharge on the oil-pressboard interface is considered to be serious fault condition. This phenomenon leads to the formation of a conducting path on the surface of an insulation material as a result of surface currents. The surface current is effectively the drift of charge under the action of an electric field which may be either the general electric field or a locally enhanced field developed around a space charge. Sustained surface discharge can eventually result in equipment failure. A needle-bar electrode configuration has been used to investigate the surface discharge phenomenon at the oil pressboard interface. This paper presents the partial discharge (PD) patterns corresponding to the surface discharge events.","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":"131340479","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: 23
Tunable selective reflection of a hydroxypropyl cellulose aqueous solution 羟丙基纤维素水溶液的可调选择性反射
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015477
Yui Kimbara, Shunsuke Yuji, S. Uto
{"title":"Tunable selective reflection of a hydroxypropyl cellulose aqueous solution","authors":"Yui Kimbara, Shunsuke Yuji, S. Uto","doi":"10.1109/ICDL.2011.6015477","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015477","url":null,"abstract":"Hydroxypropyl cellulose aqueous solution forms a cholesteric liquid crystal phase and is colored by a selective reflection. The color can be changed by applied voltage. Although many tiny bubbles which disturb current conduction are generated at a cathode electrode, it can be suppressed by a current control. A container of the HPC solution affects the selective reflection effect. A HPC solution in a tube is more homogeneous than in a conventional sandwich cell.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"44 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":"132435476","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
Review of Kraft paper/natural ester fluid insulation system aging 牛皮纸/天然酯流体绝缘系统老化研究综述
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015464
K. Rapp, J. Luksich
{"title":"Review of Kraft paper/natural ester fluid insulation system aging","authors":"K. Rapp, J. Luksich","doi":"10.1109/ICDL.2011.6015464","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015464","url":null,"abstract":"We examine the results of recent Kraft paper/natural ester fluid insulation system sealed tube aging studies. The initial rates of cellulose degradation of Kraft and thermally upgraded Kraft in mineral oil or natural esters are similar. Subsequent degradation in natural ester occurs at a slower rate. This appears to be true for both plain and thermally upgraded Kraft. Based on early sealed tube aging results, the insulation unit life of the natural ester/thermally upgraded Kraft insulation system is estimated to be 130°C. Accelerated aging of single phase distribution transformers filled with natural ester also show a reduction using a thermally upgraded Kraft/natural ester insulation system, meeting criteria for 120°C hottest spot temperature operation.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"31 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":"114074444","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: 27
Temperature-dependent contamination distribution between oil, paper and pressboard 油、纸和纸板之间的温度依赖性污染分布
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015455
D. Linhjell, L. Lundgaard, C. M. Selsbak
{"title":"Temperature-dependent contamination distribution between oil, paper and pressboard","authors":"D. Linhjell, L. Lundgaard, C. M. Selsbak","doi":"10.1109/ICDL.2011.6015455","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015455","url":null,"abstract":"A fully enclosed oil circulation rig has been made for studying the temperature-dependent equilibrium distribution of contaminants between oil-impregnated cellulose materials and oil. This is relevant for the distribution of contaminants in the solid insulation in power transformers. Used with clean, new material the rig gave humidity equilibrium results reasonably close to results found in literature. With service-aged pressboard the humidity results departed from the values from literature for clean, new material. The results had some inner consistency indicating that they were reasonably trustworthy despite some uncertainty because of long diffusion times in pressboard and some measurement uncertainty. It was also attempted to look into temperature-dependent equilibrium distribution of acids, but the variation with temperature was too small compared to the measurement uncertainty. It was also found that the rig is suitable for studying the temperature-dependent humidity saturation in otherwise contaminated oil at high temperatures.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"68 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":"126353465","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
Thermal degradation characteristics of insulating paper and oils 绝缘纸和油的热降解特性
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015429
D. Saruhashi, S. Arazoe, S. Yanabu, S. Okabe, Ichiro Kiyama
{"title":"Thermal degradation characteristics of insulating paper and oils","authors":"D. Saruhashi, S. Arazoe, S. Yanabu, S. Okabe, Ichiro Kiyama","doi":"10.1109/ICDL.2011.6015429","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015429","url":null,"abstract":"In a search for mineral oil substitutes, the authors focus on silicone and ester oils. These insulating oils are fire-resistant and environmentally friendly. In previous studies, the authors investigated streaming electrification and dielectric breakdown phenomena in these fresh oils and found that their performance was similar to or better than that of mineral oil. In the present study, the authors focus on the thermal degradation of insulating oils. Thermal degradation tests in the presence of a solid insulator and copper for carried out 1000 hours. Changes in color and dielectric breakdown characteristics were investigated during thermal degradation of the insulating oils. The authors also investigated the mechanical strength of the solid insulator. The characteristics of aged oils were compared with those of fresh oil.","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":"127373176","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
Corona discharge within organic oil insulations 有机油绝缘内的电晕放电
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015412
J. Pihera, P. Trnka, V. Mentlík, M. Širůček, P. Mráz
{"title":"Corona discharge within organic oil insulations","authors":"J. Pihera, P. Trnka, V. Mentlík, M. Širůček, P. Mráz","doi":"10.1109/ICDL.2011.6015412","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015412","url":null,"abstract":"Presented experiment consists of laboratory testing of partial discharges activity in liquid insulating fluids. Corona discharges within different insulation fluids were measured accordingly. The trends of partial discharge main parameters are studied and described in dependence on liquid type and aging time. The studied oils were thermally aged at 90°C for 3000 hours in air atmosphere within special climatic oven. Corona discharges measurement was realized using a point/plane electrode configuration where the whole test set-up was completely immersed in tested oil to suppress ambient conditions.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"11 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":"125250126","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
Assessing oil paper insulation conditions by poles computed from Frequency Domain Spectroscopy 用频域光谱计算的极点评价油纸绝缘条件
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015418
Y. Hadjadj, I. Fofana, F. Meghnefi, H. Ezzaidi
{"title":"Assessing oil paper insulation conditions by poles computed from Frequency Domain Spectroscopy","authors":"Y. Hadjadj, I. Fofana, F. Meghnefi, H. Ezzaidi","doi":"10.1109/ICDL.2011.6015418","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015418","url":null,"abstract":"In this contribution, the dielectric dissipation factor of oil impregnated paper were monitored along with the degree of polymerization. A series of experiments have been performed under controlled laboratory conditions. Since the dielectric parameters values are geometry dependent, poles which are independent of the geometry, calculated from resistances and capacitances, were considered to evaluate the condition of oil impregnated paper insulation. A correlation has been observed between the degree of polymerisation of the paper insulation and the poles values outputted from the frequency response. From the investigations performed on new and aged oil paper samples, it was shown that poles can be regarded as insulation aging indicator.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"3 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":"117058174","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: 7
Time-dynamic oxidation stability studies of mineral insulating oils 矿物绝缘油的时间动态氧化稳定性研究
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015164
P. Wiklund, Chatleen Karlsson
{"title":"Time-dynamic oxidation stability studies of mineral insulating oils","authors":"P. Wiklund, Chatleen Karlsson","doi":"10.1109/ICDL.2011.6015164","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015164","url":null,"abstract":"IEC 61125C, a traditional oxygen-rich material test for determination of oxidation stability of insulating oils, was modified to give continuous data over the entire testing time by application of a logging pH-meter. A complementary oxygen-poor testing method, which may be more relevant to certain power transformer designs, was also developed further. The methods give insight into the chemistry and dynamics of oil oxidation, and may serve as a future means to investigate insulating oil behavior and support development of high performance insulating oils.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"64 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":"114800179","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
Surface treeing on pressboard barriers in synthetic and natural ester liquids under AC stress 合成酯和天然酯液体在交流应力下的压板屏障表面树状
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015452
X. Yi, Z.D. Wang, F. Perrot, M. Lashbrook
{"title":"Surface treeing on pressboard barriers in synthetic and natural ester liquids under AC stress","authors":"X. Yi, Z.D. Wang, F. Perrot, M. Lashbrook","doi":"10.1109/ICDL.2011.6015452","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015452","url":null,"abstract":"This paper reports experimental investigations on pressboard surface treeing processes and the accompanying creepage discharge patterns. With the help of fast digital video recorder, wideband discharge current sampling resistor and commercial PD detector, it is found that the liquid impregnated pressboard as composite insulation is susceptible to erosion giving rise to white marks due to intense discharges occurring on/near to the pressboard surface. The white mark is visible after discharges evaporate the liquid and moisture and takes the form of trapped gaseous bubbles within the surface layers of pressboard. Once the white mark is formed, it can continue to grow even under a reduced voltage level until it bridges the gap and finally causes flashover. The white mark appears at a lower voltage and propagates more readily on the ester impregnated pressboard, due to more intense discharges, more gas generation and the higher viscosity of esters than mineral oil.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"4 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":"114304957","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
Electrical breakdown of water using porous ceramic-coated electrode 利用多孔陶瓷涂层电极对水进行电击穿
2011 IEEE International Conference on Dielectric Liquids Pub Date : 2011-06-26 DOI: 10.1109/ICDL.2011.6015476
P. Lukeš, M. Člupek, V. Babický, P. Šunka
{"title":"Electrical breakdown of water using porous ceramic-coated electrode","authors":"P. Lukeš, M. Člupek, V. Babický, P. Šunka","doi":"10.1109/ICDL.2011.6015476","DOIUrl":"https://doi.org/10.1109/ICDL.2011.6015476","url":null,"abstract":"Electrical breakdown of water using porous ceramic-coated rod electrodes were investigated for two types of ceramics, oxide (corundum) and silicates (almandine). Properties of the ceramic layer and its interaction with the electrolyte, i.e., surface chemistry at the electrolyte/ceramic surface interface, were found as important factors in generating electrical discharges in water. The buildup of surface charge, which was determined by the polarity of the applied voltage, pH and chemical composition of aqueous solution, led to the formation of an electrical double layer at the ceramic surface. Under an externally applied electric field, this double layer becomes polarized, which affected the electric field distribution on the ceramic electrode and conditions needed for initiation of the discharge in water.","PeriodicalId":364451,"journal":{"name":"2011 IEEE International Conference on Dielectric Liquids","volume":"46 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":"129577433","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
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