Conference Record of the 2006 IEEE International Symposium on Electrical Insulation最新文献_第5页

The study on evaluation model for prefabricated HV stress cone of cable terminations weakness based on finite element 基于有限元的预制电缆端部高压应力锥弱点评估模型研究

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665362

L. Gang, Liu Yigang, W. Chao, Yi Zepei

引用次数: 12

Applications of insulation resistance and high direct voltage ramp tests to the assessment of insulation systems of hydrogenerator stator bars and coils 绝缘电阻和高压斜坡试验在水轮发电机定子棒和线圈绝缘系统评定中的应用

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665340

B. Gronowski

引用次数: 2

An experiment for evaluating the scale effect of moisture on high voltage transformer insulation 评价湿气对高压变压器绝缘的水垢效应的实验

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665296

P. M. Mitchinson, P. Lewin, G.C. Chen, P. Jarman

{"title":"An experiment for evaluating the scale effect of moisture on high voltage transformer insulation","authors":"P. M. Mitchinson, P. Lewin, G.C. Chen, P. Jarman","doi":"10.1109/ELINSL.2006.1665296","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665296","url":null,"abstract":"Many experiments have been undertaken and results published on ageing of high voltage transformer insulation. The objective of these experiments has been to quantify how insulation is affected by moisture and temperature. However, the experiments have invariably been performed on small scale bench top equipment. The validity of scaled up results is always questionable and is exacerbated by the lack of published field data for comparison. A new apparatus has been developed to explore the effect of scale. The goal is to perform experiments representative of conditions inside a high voltage transformer. Electric stress of up to 10 kV can be applied to a pressboard insulated electrode immersed in the bulk oil. A series of experiments are performed to quantify the bulk insulation behaviour of pressboard in virgin oil. The apparatus has a test cell holding 370 litres of oil. The temperature of the test cell can be controlled up to 80 degC and the condition of the oil/paper system evaluated using the usual techniques of moisture analysts, voltage breakdown, tandelta etc. The paper contains a technical description of the apparatus and initial results taken from pressboard samples using the recovery voltage measurement (RVM) technique","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"252 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":"121249430","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

Insulation effects and characteristics of XLPE covered overhead conductors in low and medium voltage power distribution systems in Iran 伊朗中低压配电系统中交联聚乙烯覆盖架空导线的绝缘效果及特性

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665258

F. Shahnia, A. M. Kashtiban, K. R. Milani, M. T. Haque

引用次数: 9

Condensation of water vapour in XLPE insulation at different cooling rates and pressures 在不同冷却速率和压力下交联聚乙烯绝缘中水蒸气的冷凝

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665369

O. Hestad, S. Hvidsten

{"title":"Condensation of water vapour in XLPE insulation at different cooling rates and pressures","authors":"O. Hestad, S. Hvidsten","doi":"10.1109/ELINSL.2006.1665369","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665369","url":null,"abstract":"Temperature cycling and temperature gradients can cause super saturation of water vapor in the insulation. Condensation of water can then occur and high hydrostatic pressures can be established within water droplets embedded in the polymer. Water treeing is closely related to the condensation of water, and the main purpose of this paper has therefore been to examine the effect of different cooling rates and pressures on water condensation in XLPE insulation during temperature cycling. 1 mm thick samples cut from a XLPE cable with a super clean grade XLPE (Borealis LE 4201 S) were subjected to temperature cycles from 90 to 65, or 90 to 20degC at cooling rates ranging from 0.12 to 120degC/min. The total pressure during cycling was atmospheric or 100 bars. The insulation was characterized by water content measurements and microscopy SEM examinations. The solubility of water was about 244 g/m 3 at 90degC independent of the applied pressure. The results show that a relatively small but significant increase of about 65 g/m3 of water were measured for the fastest cooling rates at atmospheric conditions (1 bar) after 50 cycles. No significant change was measured for the slow cooling at the same conditions. An even smaller, but not significant, increase was measured at 100 bars, indicating that the high external pressure to some extent suppresses the formation of micro-voids. It is likely that the relatively low water content after the temperature cycles was due to a very low density of condensation nuclei within the insulation avoiding the formation of micro-voids. This was confirmed by the SEM analysis","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":"114593766","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

Electric field distribution along the surface of high voltage polymer insulators and its changes under service conditions 高压聚合物绝缘子表面电场分布及其在使用条件下的变化

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665256

Ailton L. Souza, Ivan J. S. Lopes

引用次数: 10

Partial discharge-a valuable stator winding evaluation tool 局部放电-一个有价值的定子绕组评估工具

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665339

P. Maughan

引用次数: 21

The analysis of surface degradation mechanism on epoxy/glass fiber used for outdoor insulator 室外绝缘子用环氧/玻璃纤维表面降解机理分析

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665257

G. Park, K. Lim, J. Yuk, D. You, M. Hwang

引用次数: 1

Comparisons of discrete wavelet transform, wavelet packet transform and stationary wavelet transform in denoising PD measurement data 离散小波变换、小波包变换和平稳小波变换对PD测量数据去噪的比较

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665301

X. Zhou, C. Zhou, B. Stewart

引用次数: 47

Managing high short circuit current in generating power plants and substations 处理发电厂和变电站的高短路电流

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665319

S. Bodea

引用次数: 0