2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena最新文献_第7页

A study of electrical characteristics of mineral transformer oils with reduced and increased viscosity 粘度降低和增加矿物油的电特性研究

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254800

M. Pompili, R. Campi

引用次数: 2

Composition control and electrical properties of Ni-Cr thin films prepared by co-sputtering method 共溅射法制备镍铬薄膜的成分控制及电性能

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254797

Boong-joo Lee, G. Park, D. You, D. Lee

引用次数: 2

Electroluminescence phenomena of low density polyethylene film under applied ac voltage 交流电压作用下低密度聚乙烯薄膜的电致发光现象

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254839

K. I. Wong, P. Lewin, S. Dodd

引用次数: 7

Effect of high frequency conducted disturbances on the interturn insulation of an inverter-fed induction motor 高频传导扰动对变频感应电动机匝间绝缘的影响

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254904

R. Candela, C. Petrarca, P. Romano

{"title":"Effect of high frequency conducted disturbances on the interturn insulation of an inverter-fed induction motor","authors":"R. Candela, C. Petrarca, P. Romano","doi":"10.1109/CEIDP.2003.1254904","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254904","url":null,"abstract":"As shown in recent papers, Partial Discharge activity has a fundamental role in the premature failure of electrical insulation of machine stator windings fed by PWM inverters. The existence of Partial Discharges can be easily explained if the presence of micro voids inside a composite insulation is considered to be unavoidable. Since such micro cavities are filled with a gas whose permittivity is generally several times lower than the permittivity of the surrounding dielectric, the electric field in such occlusions can be much higher than the local expected average stress. On the basis of a numerical study carried out by using a multi conductor transmission line model for the evaluation of the potential distribution inside the machine and a PD simulation model for the evaluation of the possible ensuing PD activity, in this paper, a new experimental approach to evaluate the effect of PD generated by inverter distorted voltages is proposed. PD measurements under 50 Hz -10 kHz quasi-square and sine wave voltage waveform are performed by means of an Hv capacitive bridge measurement system in order to reject external disturbances, like voltage overshoots, and they are acquired by ultra-wide band (UWB) acquisition system.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125361280","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: 3

The electrical strength of transformer oil in a transformerboard-oil system during moisture non-equilibrium 变压器油系统中变压器油在水分非平衡状态下的电强度

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254845

B. Buerschaper, O. Kleboth-Lugova, T. Leibfried

{"title":"The electrical strength of transformer oil in a transformerboard-oil system during moisture non-equilibrium","authors":"B. Buerschaper, O. Kleboth-Lugova, T. Leibfried","doi":"10.1109/CEIDP.2003.1254845","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254845","url":null,"abstract":"The operational reliability of power transformers depends primarily on the oil-transformerboard condition. It's well known, that the presence of moisture has significant influence on ageing of transformerboard and also on the dielectric strength of transformer oil. At constant temperature a moisture equilibrium between oil and transformerboard exists. The change of load conditions causes a change of temperature and as a result a migration of moisture between oil and transformerboard. These interactions are very important for the breakdown phenomena in oil-cellulose insulation. The disturbance of moisture equilibrium results in a significant reduction of the electrical strength of the oil, especially if the transformerboard has a water content more than 2.5%. This value is normally in an ageing transformer. The experimental investigations of the electrical strength of transformer oil during moisture nonequilibrium are presented. The transition conditions are simulated in an indirectly heated test setup, which represents the insulation system of a power transformer. This model has the same oil-transformerboard ratio (volume and surface area) as a real 200 MVA transformer. The parameters, having the main influence of the breakdown-voltage during the non-equilibrium state, are discussed.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125825765","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: 26

Space charge measurement in XLPE cable with temperature gradient through the insulation 绝缘温度梯度交联聚乙烯电缆空间电荷测量

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254832

M. Fu, G. Chen

引用次数: 6

Performance of novel high voltage outdoor thermoplastic elastomeric insulators 新型高压室外热塑性弹性体绝缘体的性能研究

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254883

E. Soundarajan, E. Jackson, A. King, R. Stmdararajan

引用次数: 9

On the UHF partial discharge measurement in transformers 变压器超高频局部放电测量的研究

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254865

R. Kuppuswamy

引用次数: 3

Analysis of partial discharges in stator windings 定子绕组局部放电分析

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254936

R. Patsch, D. Benzerouk

引用次数: 3

Effect of gas pressure on partial discharge in voids in epoxy 气体压力对环氧树脂空隙局部放电的影响

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI: 10.1109/CEIDP.2003.1254933

D. James, I. Sauers, A. Ellis, M. Pace, D. Deschenes

{"title":"Effect of gas pressure on partial discharge in voids in epoxy","authors":"D. James, I. Sauers, A. Ellis, M. Pace, D. Deschenes","doi":"10.1109/CEIDP.2003.1254933","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254933","url":null,"abstract":"The pressure inside an enclosed void in a solid dielectric is generally determined by calculation based on equating the measured partial discharge (PD) onset voltage and the breakdown voltage from the Paschen curve for a particular gas. Here it is assumed that the gas is known or that physical properties remain approximately constant. In the present experiment, two different large voids were placed in epoxy adjacent to the ground electrode containing a small pump out port. This arrangement allowed for direct measurement and setting of the pressure for different gases filling the void. PD onset and extinction voltages were determined as a function of pressure over the range from 13.3 Pa (0.1 torr) to 101 kPa (760 torr) for nitrogen and SF/sub 6/ at room temperature. The onset voltages generally followed the Paschen curve dependence on pressure but were higher in voltage at pressures around the minimum, while the extinction voltage followed the Paschen curve more closely in both pressure dependence and voltage. Agreement with the Paschen curve is better at the higher pressures. One possible explanation is the dominant role that real surfaces play at lower pressures.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122092807","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: 19