Conference Record of the 2004 IEEE International Symposium on Electrical Insulation最新文献_第10页

Sheath insulation fault test technique for high voltage power cables 高压电力电缆护套绝缘故障试验技术

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI: 10.1109/ELINSL.2004.1380604

Minghua Li, Zhang Yan, Bing-Han Xu

{"title":"Sheath insulation fault test technique for high voltage power cables","authors":"Minghua Li, Zhang Yan, Bing-Han Xu","doi":"10.1109/ELINSL.2004.1380604","DOIUrl":"https://doi.org/10.1109/ELINSL.2004.1380604","url":null,"abstract":"Healthy sheath insulation is very important for the safe operation of power cables, especially for single core cables. If there are insulation faults in the sheath, the cable's life will be obviously shortened, and many online cable insulation-monitoring systems will fail to operate. An effective test system to locate and position insulation faults in cable sheath is explored in this paper. Measuring the metal shield resistance between the cable terminal and the fault point, and then comparing it to some parameters based on the normal shield resistance will be helpful to evaluate the distance to the fault point. The influence of the intrinsic and contact resistances of the test leads can be completely eliminated. After the fault distance is located, it is necessary to find the accurate position by so-called positioning methods. The modified pace voltage method is developed in this paper. Other than the traditional constant voltage method, a periodical high voltage surge is applied to the metal shield of the tested faulty sheath, and the pace voltage is recorded by a digital voltmeter instead of analog pointers. Such a testing system has showed great convenience and accuracy in practices. Some actual cable sheath fault locating and positioning test cases are also listed and analyzed in this paper.","PeriodicalId":342687,"journal":{"name":"Conference Record of the 2004 IEEE International Symposium on Electrical Insulation","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131230186","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

Profile of water content and degree of polymerisation in the solid insulation of power transformers 电力变压器固体绝缘中含水量和聚合度的分布

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI: 10.1109/ELINSL.2004.1380475

T. Leibfried, U. Thieb, I. Hohlein, B. Breitenbauch, T. Lainck, J. Leibner, S. Truant

引用次数: 8

A new algorithm for the identification of defects generating partial discharges in rotating machines 一种旋转机械局部放电缺陷识别新算法

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI: 10.1109/ELINSL.2004.1380520

A. Cavallini, M. Conti, A. Contin, G. Montanari, F. Puletti

引用次数: 20

Fundamental investigation results of diagnostic technique for deteriorated polymer insulators 劣化聚合物绝缘子诊断技术的基本研究结果

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI: 10.1109/ELINSL.2004.1380560

T. Sampe, T. Hirayama, M. Ito, T. Kubota, T. Matsumoto, M. Yaeguchi, B. Marungsri, H. Shinokubo, R. Matsuoka, Z. Guo, Zhang Yu

引用次数: 1

PD pattern recognition using combined features 基于组合特征的PD模式识别

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI: 10.1109/ELINSL.2004.1380490

Jian Li, Caixin Sun, Youyuan Wang, Ji Yang, L. Du

引用次数: 3

The effect of winding stresses on the pulse endurance of corona resistant magnet wire 绕组应力对耐电晕磁线脉冲耐久性的影响

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI: 10.1109/ELINSL.2004.1380503

M. G. Minnick

{"title":"The effect of winding stresses on the pulse endurance of corona resistant magnet wire","authors":"M. G. Minnick","doi":"10.1109/ELINSL.2004.1380503","DOIUrl":"https://doi.org/10.1109/ELINSL.2004.1380503","url":null,"abstract":"Past studies have indicated reliability advantages of using corona resistant magnet wire (CRMW) for insulation systems in motors operated with pulse width modulated (PWM) adjustable speed drives. However, twisted pair testing of CRMW after the application of mechanical stress indicates that these life advantages of CRMW rapidly diminish, where a 60 - 70% reduction in life is observed for each 9% elongation stress. This contrasts with an observed reduction of only /spl sim/25% for standard wire. Hence, it is important to understand how stresses induced in this wire during winding, insertion, and end turn blocking operations can affect magnet wire pulse resistance performance. To this end, pulse endurance life testing of magnet wire twisted pairs was compared with pulse endurance testing of a wound stator model. These tests indicate that the winding stresses observed for stators can be simulated by inducing a mandrel pull stress in the magnet wire prior to forming a twisted pair. The use of this correlation can not only improve the studies of winding stresses on CRMW, but also assess the impact of varnish treatment on winding life. These studies will facilitate further improvement in the insulation system reliability.","PeriodicalId":342687,"journal":{"name":"Conference Record of the 2004 IEEE International Symposium on Electrical Insulation","volume":"345 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115970380","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

Pollution flashover performance of short sample for 750 kV composite insulators 750kv复合绝缘子短样污闪性能研究

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI: 10.1109/ELINSL.2004.1380570

Xingliang Jiang, Jianlin Hu, Yu Liang, L. Shu, S. Xie

引用次数: 17

Partial discharge diagnosis on large power transformers 大型电力变压器局部放电诊断

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI: 10.1109/ELINSL.2004.1380511

D. Gross, M. Soller

引用次数: 11

Failure analysis of extra-high voltage (EHV) hot sticks 特高压(EHV)热棒失效分析

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI: 10.1109/ELINSL.2004.1380692

J. Booker

{"title":"Failure analysis of extra-high voltage (EHV) hot sticks","authors":"J. Booker","doi":"10.1109/ELINSL.2004.1380692","DOIUrl":"https://doi.org/10.1109/ELINSL.2004.1380692","url":null,"abstract":"After three field flashover failures of EHV hot sticks, two in Canada at 500 kV and one in the USA at 345 kV, a study of the present day maintenance and testing methods was needed. Experimentation does show that rubbing of the fiberglass reinforced plastic (FRF) over aluminum, aged conductors, and galvanizing will deposit micron size conductive particles onto the insulating medium. The need for a new method of testing was suggested because these field failures implied that the testing methods being used might not have been sufficient in sensitivity to find the problems before they caused a field failure. The low voltage testing methods used for hot stick testing will be compared to aerial lift testing per ANSI-A92.2. In so doing, it may become evident that the evolution of hot stick testing needs a quantum leap in sensitivity to prevent future field failures. The reality of moisture having the capability to penetrate through FRF material will be demonstrated several ways. Moisture spots or an accumulation of metallic contamination that cannot be removed by normal cleaning techniques may determine the end of life of EHV hot sticks. Photographs of the conductive contamination will be provided in the technical paper. The metallic material has been found to be difficult to remove in the cleaning process since it is difficult to see with a 100 X microscope. To insure the flashover resistance of this very important insulation, it is recommended to go at least 700 kV for at least five seconds to make sure the flashover resistance is there. In addition work methods will be addressed, stressing the importance of proper care when installing, using, storing, and maintaining these tools to prevent surface contamination that can lead to reduction of the insulating integrity.","PeriodicalId":342687,"journal":{"name":"Conference Record of the 2004 IEEE International Symposium on Electrical Insulation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129471879","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

Outdoor insulation coordination with artificial neural network 室外保温协调人工神经网络

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI: 10.1109/ELINSL.2004.1380572

W. Sima, Qing Hu, Kunli Bai Yang, Xingliang Jiang

引用次数: 3