Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)最新文献_第10页

Risk-of-failure calculation accuracy 失效风险计算精度

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694844

A. Farag, M. H. Shewhdi, M. Izzularab, T. Cheng

引用次数: 1

Interpretation of results obtained from testing of oil filled electrical power transformers in field for several utilities in the world 对世界上几家公用事业公司现场充油电力变压器试验结果的解释

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704645

H. Shertukde, J. Lackey

{"title":"Interpretation of results obtained from testing of oil filled electrical power transformers in field for several utilities in the world","authors":"H. Shertukde, J. Lackey","doi":"10.1109/ELINSL.1998.704645","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.704645","url":null,"abstract":"This paper will shed some light on the recent results collected while testing several transformers for utilities around the world using the recently developed Fault Diagnostic Device for Electrical Power Transformers (FD/sup 2/-EPT) by the first author and presently available commercially and used successfully by the second author at Ontario Hydro. The results obtained cover a wide range of transformers tested since December 1995 to November 1997 by the authors either individually or as a team, covering a volt-amp rating from 5 MVA to as high as 750 MVA, both in the single and three phase configurations. The single phase transformers were common in the 340 MVA rating. The voltage rating extended from 4.8 kV to 500 kV. The categories of transformers tested fell under: (1) distribution, (2) substation, (3) generator start-up, (4) unit transformers, (5)system service transformers and (6) rectifier transformers. The results obtained are primarily of the partial discharge (PD) type, however further validation of the results may indicate some other kind of incipient fault. A database of signals collected for several situations will be discussed and an attempt at making a base line interpretation for such signals will be enumerated using several examples. This data was also collected to generate the standards for the IEEE user's guide for such a device. The first author is also a member of the working group of the IEEE Transformer Committee working on such a users guide.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"39 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":"124094328","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

Electro-thermal-mechanical computations in ZnO arrester elements ZnO避雷器元件的电热力学计算

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694834

S. Boggs, J. Kuang, H. Andoh, S. Nishiwaki

引用次数: 16

Prebreakdown phenomena in insulating gases. Evaluation of the time-to-breakdown 绝缘气体中的预击穿现象。对故障时间的评估

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694887

E. Gaxiola, J. Wetzer

引用次数: 1

A theoretical approach of partial discharges under square voltage wave forms 方形电压波形下局部放电的理论研究

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704714

T. Lebey

引用次数: 9

Bremsstrahlung radiation and induced current in polyimide 聚酰亚胺中的轫致辐射和感应电流

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704693

H. M. Banford, K. Hodyr, S. Wysocki, R. Fouracre

{"title":"Bremsstrahlung radiation and induced current in polyimide","authors":"H. M. Banford, K. Hodyr, S. Wysocki, R. Fouracre","doi":"10.1109/ELINSL.1998.704693","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.704693","url":null,"abstract":"Investigations were made of current transients induced in polyimide by pulses of bremsstrahlung radiation. Test specimens, 50 /spl mu/m thick, were mounted in a vacuum chamber that was positioned as the target in the output beam of an electron accelerator. The electron beam was converted to bremsstrahlung via its interaction with a 4 mm thick lead shield placed in front of the test chamber. The test specimens were stressed by direct voltages to give applied fields approaching 10/sup 7/ V/m and the current following a bremsstrahlung pulse was recorded on a fast oscillograph. Experiments were carried out with both fresh material and material irradiated by electrons to various doses, with a maximum of 100 kGy. It was found that there were marked differences in behaviour between fresh and irradiated material. With positive dc polarisation and an unirradiated sample the output current signal showed an initial negative peak followed by a positive one, the amplitudes of the peaks increasing with increasing polarising voltage. The negative peak decreased in amplitude with increasing radiation dose and at 5 kGy had practically disappeared completely. The positive one remained and increased in amplitude with dose and field. The material also demonstrated a diode effect, in that with a negative bias no output signal was observed. Upon reversal of the field, however, a very large positive pulse was evident.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"35 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":"131844203","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

Aging of solid insulators exposed to toxic fire byproducts 固体绝缘体暴露在有毒的火灾副产品中老化

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694864

C. Dervos, P. Vassiliou

引用次数: 0

XLPE materials for extruded high/extra-high voltage transmission cables 交联聚乙烯(XLPE)材料，用于挤压高压/特高压传输电缆

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694851

L. Gross, J. S. Furno, C. G. Reid, A. Mendelsohn

引用次数: 9

Field measurements of electric and magnetic fields on HV and EHV transmission lines and substations 高压和超高压输电线路和变电站的电场和磁场现场测量

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694806

K. Srinivasa, R. Maruti, O. Rajesh Kumar, P. Nambudiri, M.S. Lalli, K. Srinivasan, M. Goswami

引用次数: 3

Diagnostic technique to assess the condition of stator insulation by measuring microwave associated with dielectric breakdown 通过测量与介质击穿相关的微波来评估定子绝缘状况的诊断技术

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704712

Masatake Kawada, Zen-Ichiro Kawasaki, Kenji Matsuura

{"title":"Diagnostic technique to assess the condition of stator insulation by measuring microwave associated with dielectric breakdown","authors":"Masatake Kawada, Zen-Ichiro Kawasaki, Kenji Matsuura","doi":"10.1109/ELINSL.1998.704712","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.704712","url":null,"abstract":"Partial Discharge (PD) occurring in the stator insulation of the generator is a symptom and/or a direct cause of the deterioration of the insulation system. It is reported that PD is a very short duration current and/or voltage pulse, about 1/spl sim/5 [ns]. Generally PD emits electromagnetic waves which are broadband signals (/spl sim/GHz). Therefore we developed a new system for detecting the electromagnetic waves, especially microwave (GHz) emitted from. From the point of view of protecting an accident caused by the insulation breakdown, it is important to assess the condition of the winding. We applied our system to a dielectric breakdown test to know the relation between the characteristics of the microwave and the insulation condition of the winding. The dielectric breakdown test is useful for estimating the minimum breakdown voltage which is a criterion of the insulation condition of the winding. Experimental results showed that this system was able to assess the insulation condition by measuring the number of the pulses of the microwave per voltage cycle.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"7 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":"130965300","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: 0