Conference Record of the 2006 IEEE International Symposium on Electrical Insulation最新文献

Modelling of oil-paper insulation layers in the frequency domain with cole-cole-functions 油纸绝缘层的cole-cole-函数频域建模

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2007-07-08 DOI: 10.1109/ICSD.2007.4290752

D. Giselbrecht, T. Leibfried

{"title":"Modelling of oil-paper insulation layers in the frequency domain with cole-cole-functions","authors":"D. Giselbrecht, T. Leibfried","doi":"10.1109/ICSD.2007.4290752","DOIUrl":"https://doi.org/10.1109/ICSD.2007.4290752","url":null,"abstract":"Modern impedance analyzers offer the possibility to measure the frequency related conductivity and the complex permittivity epsiv(omega) of a sample from a few mHz up to some MHz. Impedance measurements are relatively easy to accomplish and deliver very precise results over a wide range of conductivity and capacitance. Using the measured spectra from oil-paper-confining-layer, inference can as well be made on the mobility of ions & molecules and also regarding the transport-mechanisms. It could be proved that impedance measurements with dry and moist oil-paper-confining-layer-systems show a distinctive permittivity function epsiv(omega). For modelling the dielectric performance of pure oil and pure paper systems the cole-cole-function approach for dielectric systems was applied. The modification of the relative permittivity is on one hand caused by polarization processes within the confining-layer-system and on the other hand by lamination on the boundaries between oil and paper. The moisture and temperature have a great impact on the results. One reason is the high relative permittivity of water, the other the heat convection which disturbs the lamination and the polarization. This paper supplements the theoretical model with experimentally measured data permitting better understanding of complex processes in insulation systems. The model of oil-paper insulation layers in the frequency domain could be used for transformers diagnosis","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123402123","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

A study about electrical treeing in different EVA-layered silicate nanostructured compounds 不同eva层状硅酸盐纳米结构化合物的电树结构研究

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665360

F. Guastavino, A. Dardano, G. Montanari, F. Deorsola, M.D.L. del Casale

引用次数: 17

The effect of temperature gradient on the dielectric properties of insulating fluids 温度梯度对绝缘流体介电性能的影响

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665371

I. Fofana, V. Wasserberg, H. Borsi, E. Gockenbach

引用次数: 3

Analysis of semiconductor sensor for detecting dissolved gases in power transformers 电力变压器溶解气体检测用半导体传感器分析

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665297

Lijun Zhou, Guangning Wu, Chong Su, Hongliang Wang, Haolong Tang, Shenglin Li

引用次数: 0

Evaluation of electrical insulation properties on aged composite insulators in heavily contaminated areas 重污染地区老化复合绝缘子电绝缘性能评价

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665291

Haifeng Gao, Z. Jia, Z. Guan, Yingke Mao, Liming Wang, K. Zhu

{"title":"Evaluation of electrical insulation properties on aged composite insulators in heavily contaminated areas","authors":"Haifeng Gao, Z. Jia, Z. Guan, Yingke Mao, Liming Wang, K. Zhu","doi":"10.1109/ELINSL.2006.1665291","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665291","url":null,"abstract":"The usage of silicone rubber insulators in various contaminated areas has increased prominently in recent years in China, and it still keeps this increasing trend. As the energized time in the field is prolonged, the change of hydrophobicity and the accumulation of pollution directly affect the electrical insulation performance of composite insulators. This paper reports the electrical insulation properties on aged composite insulators based on a full-scale investigation, including the classification of hydrophobicity, the measurement of ESDD and NSDD, and the visual inspection of deterioration of polymeric materials. A new voltage withstand test of long duration in a fog chamber was introduced to study the anti-pollution flashover abilities of aged samples. The accumulation of pollution on insulators energized over a period of years and some external factors were found to be adverse for the hydrophobic transfer and recovery. In addition, all test results showed that the anti-pollution flashover abilities of samples were fairly well even though they had been energized for many years in heavily contaminated areas","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":"125877591","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

Dielectric strength of oil-paper-insulation under transient voltage stress 暂态电压应力下油纸绝缘的介电强度

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665375

M. Rosner, F. Hofmann, A. Schnettler

引用次数: 1

Partial discharge measurements: becoming a fundamental tool for quality control and risk assessment of electrical systems? 局部放电测量:成为电力系统质量控制和风险评估的基本工具?

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665312

G. Montanari

引用次数: 16

PD-source localization in the insulating system of large power transformers 大型电力变压器绝缘系统中pd源的定位

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665348

J. Fuhr

{"title":"PD-source localization in the insulating system of large power transformers","authors":"J. Fuhr","doi":"10.1109/ELINSL.2006.1665348","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665348","url":null,"abstract":"PD-source localization in a complicated multi-material insulating system like that of a power transformer is still a challenge for all testing engineers. Additionally to the measurement of apparent charge with a conventional PD-system (according to the Standards), detection of acoustical PD-signals can be used to localize the PD-source. In many cases however, especially for PD-sources hidden in the solid insulation or in the main insulation of the transformer, there are no acoustical PD-signals detectable. In such a situation the consequent application of an advanced PD-system performing both statistical analysis of the PD-signals (PD-pattern) and analysis of PD-current impulses in time- and frequency-domain is the next step in the localization procedure. Here localization is based on the comparison of the results delivered by the real PD-source with characteristic responses of the RLCM-network of the specific transformer to calibrating impulses applied at the respective bushing. Results of these measurements and a detailed analysis of the transformer design reveal the areas of high electrical field in the insulating system where the PD-source is located. In this contribution both the localization procedure and the application to the real case of 340 MVA, 236/21 kV three phase transformer are discussed","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"34 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":"116833295","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

Corrosive sulphur in mineral oils: its detection and correlated transformer failures 矿物油中腐蚀性硫的检测及相关变压器故障

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665342

V. Tumiatti, R. Maina, F. Scatiggio, M. Pompili, R. Bartnikas

引用次数: 24

3D analysis and calculation of stator temperature field of hydrogenerator in the case of sudden short circuit 水轮发电机突然短路时定子温度场的三维分析与计算

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665280

Fan Yadong, Wen Xishan, Xu Shaohua, D. Wei

引用次数: 7