Conference Record of the 2006 IEEE International Symposium on Electrical Insulation最新文献_第2页

Partial discharge measurements for a twisted pair of insulated conductors at low pressures in air, argon and helium 低压空气、氩气和氦气中双绞线绝缘导体的局部放电测量

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665313

X. Liu, D. Kasten, S. Sebo

引用次数: 9

Research on transmission line system simulation models with line arresters and its application 带线路避雷器的输电系统仿真模型及其应用研究

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665322

X. Ren, Guangning Wu, Longhai Fu, Zeng Li

引用次数: 2

Performance of calcined and uncalcined VPI mica tapes for high voltage AC stator winding insulation 高压交流定子绕组绝缘用煅烧和未煅烧VPI云母带的性能

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665327

R. Omranipour, M. Stranges, F. Plummer, J. Hayward

引用次数: 5

Detecting instrument for DC partial discharge within storage capacitor 存储电容器直流局部放电检测仪

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665324

Y.M. Qu, Guangning Wu, Xueqin Zhang, Xiaohua Li, Wen Shu

引用次数: 4

The aging characteristics of laminated pressboard and laminated wood in oil cooled power transformers 油冷电力变压器层压板和层压木材的老化特性

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665343

H. Gasser, C. Krause, T. Prevost

{"title":"The aging characteristics of laminated pressboard and laminated wood in oil cooled power transformers","authors":"H. Gasser, C. Krause, T. Prevost","doi":"10.1109/ELINSL.2006.1665343","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665343","url":null,"abstract":"Presspaper and pressboard products made from pure kraft pulp have been used successfully for decades for the solid insulation of power transformers. Many researchers have investigated the aging behavior of such cellulose products in the past. In the recent years, the transformer industry started to use significantly higher quantities of laminated wood (plywood) products. Yet, manufacturers and users have not thoroughly studied the long-term characteristics of these alternative products in comparison with kraft products. This paper reports and discusses results from accelerated aging tests investigating the behavior of laminated pressboard and laminated wood in mineral oil. The test conditions were chosen to simulate realistically the operation of open breathing transformers from commissioning to end of life, when the cellulose has decomposed to an extent that the apparatus has to be taken out of service. Two different types of laminated wood (low and high density) from two different suppliers were tested in parallel with laminated pressboard at temperatures from 105 to 135 degC, and an aging time of up to 16 months. Regular testing of the condition of the liquid and solid insulation included flexural strength, water and acid contents, degree of polymerization, dissolved gas analysis and furan content. The results show significantly more acids in the case of laminated wood, which contains high quantities of lignin and natural resin compounds. Faster degradation of the mechanical strength associated with cracks and carbon deposits, corrosion and sludge formation was observed with laminated wood. Moreover, the combustible gases composition is different. In the case of laminated wood, hydrogen production and even gas bubble formation was observed","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"319 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133366076","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: 5

Investigations into the use of temperature detectors as stator winding partial discharge detectors 使用温度检测器作为定子绕组局部放电检测器的研究

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665335

S. Campbell, G. Stone

引用次数: 9

Nonlinear properties of ZnO ceramics as a function of threshold voltage and fraction of nonconducting grains ZnO陶瓷的非线性特性与阈值电压和非导电晶粒分数的关系

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665309

M. R. Meshkatoddini, S. Boggs

引用次数: 3

PD measurements during the degradation of twisted pair enameled wires subjected to repetitive voltage impulses 重复电压脉冲作用下双绞线漆包线退化过程中的PD测量

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665278

F. Guastavino, A. Dardano, A. Ratto, E. Torello

引用次数: 4

Statistical time distribution of partial discharges under semi-square voltages 半平方电压下局部放电的统计时间分布

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665314

E. Lindell, T. Bengtsson, J. Blennow

{"title":"Statistical time distribution of partial discharges under semi-square voltages","authors":"E. Lindell, T. Bengtsson, J. Blennow","doi":"10.1109/ELINSL.2006.1665314","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665314","url":null,"abstract":"The conventional approach to detect partial discharges (PDs) relies on discrimination of PDs from the applied voltage, based on differences in their respective frequency contents. This is practically realised by means of a capacitive decoupling principle. However, due to the increased use of power electronic devices, voltages that appear in the system can contain high frequency components, which limit the possibility for the discrimination and make the use of the standard method for PD detection difficult or even impossible. It is therefore necessary to find other features of PDs that could be used in addition. One example is the statistical time distribution of PD appearance. In this study, the statistical time distribution of PD appearance was investigated for semi-square voltages with exponentially rising fronts. The test object was a needle in air, to which positive voltage waveforms with different rise times and voltage levels were applied. Voltages up to 10 kV with rise times of 60 mus-260 mus were used. A conventional PD decoupling circuit followed by on-line signal processing was employed for the detection. To quantify the occurrence of PDs, a concept of \"first discharge rate\" was introduced and its dependence on steepness of the applied voltage was investigated. For most combinations of voltage level and rise time, a considerable number of PDs appeared during the voltage rise. This is important to consider when designing PD measurement techniques for semi-square voltages","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124270283","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

The monitoring of property changes in insulating materials containing silicone binder 含硅粘合剂的绝缘材料性能变化的监测

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665334

V. Mentlík, R. Polanský, J. Pihera, P. Prosr, P. Trnka

{"title":"The monitoring of property changes in insulating materials containing silicone binder","authors":"V. Mentlík, R. Polanský, J. Pihera, P. Prosr, P. Trnka","doi":"10.1109/ELINSL.2006.1665334","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665334","url":null,"abstract":"The construction of electrical devices operating at extremely high temperatures requires insulating systems with appropriate thermal properties. Insulating materials based on mica and silicone binder are usually used for this purpose. For these materials, it is necessary to understand their behavior under operating temperatures, as well as the specific properties which characterize their behavior with respect to temperature, e.g. glass transition temperature Tg and the thermal expansion coefficients in the glassy phase oil and the rubbery phase alpha2. It is a well-known fact that silicone binders have a glass transition temperature Tgin the negative range of values (below 0degC). This causes a problem when knowledge of the behavior of the insulating material in the positive range (above 0 degC) of values is required, since it is not possible to take the temperature Tg into account. This paper deals with examining the behavior of materials containing silicone binders at positive temperatures, and with searching for an alternate parameter, which would (thanks to its predicative ability) partly supply the above-mentioned glass transition temperature Tg. A material specifically designed for operating at high thermal stresses has been chosen for experimental purposes. The composition of the material is as follows: noncalcinated mica (91%) and thermally resistant silicone binder (9%). The maximum operating temperature given by the manufacturer is 500 degC. This material was first treated in an ageing oven at a temperature of 320 degC for 500 hours. After this thermal exposure, a voltage exposure followed. The intensity of the exposure has been selected based on our experience in the range from 3 kV for 80 hours to 5 kV for 14 hours. Afterwards, the analysis of the degradation effects at positive temperatures was realized by thermomechanical (TMA) analysis","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124393054","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