Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)最新文献

Electrical characteristics of the XLPE/EPDM double layered interface at the power cable joint 电力电缆接头处XLPE/EPDM双层接口的电气特性

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704678

W. Choi, Jin-Yeol Yoon, Kang-Sik Park, Sang-Ok Han

引用次数: 4

Data mining applied to transformer oil analysis data 数据挖掘在变压器油分析数据中的应用

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704637

D. Esp, M. Carrillo, A. McGrail

{"title":"Data mining applied to transformer oil analysis data","authors":"D. Esp, M. Carrillo, A. McGrail","doi":"10.1109/ELINSL.1998.704637","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.704637","url":null,"abstract":"Analysis of oil samples is a standard technique in the electricity industry for monitoring the condition of oil filled plant. Samples are typically taken annually, with more frequent sampling where there is a possible problem. Analyses performed on the oil include: dissolved gas analysis (DGA), colour, moisture level, acidity, breakdown voltage and Furfuraldehyde (FFA) content. In DGA the gases usually considered are: hydrogen, methane (CH/sub 4/), ethane (C/sub 2/H/sub 6/), ethylene (C/sub 2/H/sub 4/), acetylene (C/sub 2/H/sub 4/), carbon monoxide and carbon dioxide; variations in the levels of individual gases, or ratios of particular gases may indicate a problem with the plant. This situation is complicated by the fact that the levels of dissolved gas measured can be affected by the sampling technique and conditions, the laboratory performing the analysis and the duration of sample storage prior to analysis. The results of oil analysis undertaken by The National Grid Company are recorded in a database as records of gas concentrations (in ppm). These records are currently analysed by conventional methods; the reported exercise used unsupervised neural networks to unearth further information.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115014297","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: 17

Free electron energy during the aging of an organic dielectric under switching impulse voltages 开关脉冲电压下有机电介质老化过程中的自由电子能

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694842

C. Karagiannopoulos, P. Bourkas, D. Agoris, C. Psomopoulos

引用次数: 0

Breakdown characteristics of pressurized liquid helium under quench condition of superconducting wires 高压液氦在超导导线淬火条件下的击穿特性

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704696

S. Chigusa, H. Maeda, Y. Taniguchi, N. Hayakawa, H. Okubo

引用次数: 2

A novel technique for the determination of relative corona activity within inverter-duty motor insulation systems using steep-fronted voltage pulses 一种利用陡坡前电压脉冲测定逆变电机绝缘系统内相对电晕活度的新技术

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704706

Chris Lanier

{"title":"A novel technique for the determination of relative corona activity within inverter-duty motor insulation systems using steep-fronted voltage pulses","authors":"Chris Lanier","doi":"10.1109/ELINSL.1998.704706","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.704706","url":null,"abstract":"The frequent failures of induction motors being fed by IGBT-based variable speed drives due to high voltage spikes has led to an effort to both quantify the failure mechanism and develop an effective test procedure by which to assess the ability of a particular insulation system to withstand the high voltage transients which can arise in these applications. The process of corona degradation is discussed as the primary cause of these insulation failures. The concept of Corona Inception Voltage (CIV)-the voltage at which corona degradation begins in an insulation system-is presented, and the major factors contributing to the CIV of a motor's insulation system are reviewed. At this point, the task of determining a motor's CIV is discussed, and a new test procedure is introduced by the author. This procedure allows the determination of a completely wound motor's CIV when subjected to steep-fronted voltage waveforms similar to those generated by an IGBT-based variable speed drive. Several different motor insulation configurations are then evaluated with the new test procedure and compared to expected results. A practical use of the new procedure is then displayed through a comparison of the insulation systems of several currently available inverter-duty motors.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114585504","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

Direct determination of moisture in solid oil-paper insulation 固体油纸绝缘中水分的直接测定

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694860

B. Gupta

{"title":"Direct determination of moisture in solid oil-paper insulation","authors":"B. Gupta","doi":"10.1109/ELINSL.1998.694860","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.694860","url":null,"abstract":"The life of oil-paper insulation depends critically on the moisture content in paper. At present no method is available for direct measurement of moisture in paper insulation in transformers. This paper summarizes the results from a project for development of a method for direct measurement of moisture in paper in oil-paper insulated electrical equipment. Several techniques were investigated for their suitability for this application. The infrared absorption was found to be the most promising technique. The effectiveness of the infrared technique was examined on model transformer coils and on a power transformer, using optical fibre bundles for directing infrared radiation. The ratio of intensity of radiation back scattered from paper at a reference wavelength to that at a water absorption wavelength (Br/Bw) was used as a measure of the moisture content. From dry to ambient paper condition, the parameter Br/Bw changed by over 60%, and these readings were reproducible to better than 1%. Thus the infrared technique is sensitive enough to detect changes of the order of 0.1% in moisture content (eg, 1.9% to 2.0%) of paper insulation.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128295681","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: 10

Wavelet transform applying in partial discharge measurement 小波变换在局部放电测量中的应用

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694825

Yusheng Quan, N. Gao, Guan-jun Zhang, Zhang Yan

引用次数: 5

Electric conduction characteristics under non-uniform field in suspensions with electrorheological effects 具有电流变效应的悬液在非均匀场下的导电特性

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694877

R. Hanaoka, T. Kohrin, H. Kasuga, K. Sakurai

引用次数: 3

Barrier effect on the dielectric strength of oil gaps under DC voltage 直流电压下阻挡效应对油隙介电强度的影响

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694874

A. Zouaghi, A. Beroual

引用次数: 10

Application of UHF partial discharge monitoring and expert system diagnosis 超高频局部放电监测与专家系统诊断的应用

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704648

J. Gorablenkow, T. Huecker, U. Schichler

引用次数: 15