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

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Permittivity of lossy heterostructures: effects of finite conductivity and anisotropy 损耗异质结构的介电常数:有限电导率和各向异性的影响
Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694838
A. Boudida, A. Beroual, C. Brosseau
{"title":"Permittivity of lossy heterostructures: effects of finite conductivity and anisotropy","authors":"A. Boudida, A. Beroual, C. Brosseau","doi":"10.1109/ELINSL.1998.694838","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.694838","url":null,"abstract":"The complex values of the permittivity of two-component lossy heterostructures, composed of inclusions of permittivity /spl epsiv//sub 1/ embedded in a host matrix of permittivity /spl epsiv//sub 2/, are rigorously evaluated with use of the finite element method and the code FLUX3D. Numerical results concerning spherical and rodlike inclusions with various radius-to-length ratios, of finite conductivity, periodically arranged in a simple cubic lattice configuration are provided. For illustrative purpose, a single set of permittivities was investigated: /spl epsiv//sub 1/=80-i10/sup 6/ and /spl epsiv//sub 2/=2-i0. The percolation threshold volume concentration is strongly dependent on the inclusion shape. Increasing the radius-to-length ratio by one order of magnitude has the effect of shifting upwards the percolation threshold by two decades. The exponents which determine how the real and imaginary parts of the effective permittivity scale with the distance from the percolation threshold are determined and are compared with the scaling predictions of percolation theory for infinite three-dimensional lattices of insulator-normal metal composite systems.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"40 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":"121102020","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
Electric field computation studies for a fixed particle on the spacer surface as related to GIS 与GIS相关的间隔表面固定粒子的电场计算研究
Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694883
B. Nageshwar Rao, S. Ganga, K. Dwarkanath, S. N. Moorching
{"title":"Electric field computation studies for a fixed particle on the spacer surface as related to GIS","authors":"B. Nageshwar Rao, S. Ganga, K. Dwarkanath, S. N. Moorching","doi":"10.1109/ELINSL.1998.694883","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.694883","url":null,"abstract":"This paper discusses the electric stress distribution at the solid-gas interface for a spacer with fixed spherical or cylindrical conducting particle on its surface. Finite Element Method has been employed to compute the tangential and normal components of electric field at the dielectric interface. The effect of the particle shape, size, location on electric stress distribution at solid-gas interface are discussed. Experimental investigations to understand the behaviour of spacers with conducting particle on its surface and subjected to lightning impulse voltages (1.2/50 /spl mu/sec) under uniform electric field conditions in compressed gases are discussed.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"1 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":"132535914","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
Defect detection and identification of sources in GIS based on laboratory and on-site experience 基于实验室和现场经验的GIS源缺陷检测和识别
Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704651
F. Ahmed, A. Darus, Z. Yusoff, M. Haque
{"title":"Defect detection and identification of sources in GIS based on laboratory and on-site experience","authors":"F. Ahmed, A. Darus, Z. Yusoff, M. Haque","doi":"10.1109/ELINSL.1998.704651","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.704651","url":null,"abstract":"The most common defects in GIS apparatus are due to the presence of metallic particles, protrusions, as well as floating shields which originate mainly from imperfect manufacturing process, operation of switches, or may become trapped during assemble. The presence of defects deteriorates the insulation strength of a compressed SF/sub 6/ GIS apparatus and causes serious limitation in its practical application. These defects can be detected by several techniques, one of which is that using acoustic sensors placed on the enclosure. This paper reports on the defect detection and identification of sources in GIS apparatus using acoustic technique, based on laboratory and on-site experience. The tests give satisfactory result.","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":"131058164","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
An expression of critical pressure in SF/sub 6/-filled point/plane gaps SF/sub - 6/填满点/面间隙的临界压力表达式
Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704727
Wenguo Gu, Pei Wang, Qiaogen Zhang, Y. Qiu, Yunping Feng
{"title":"An expression of critical pressure in SF/sub 6/-filled point/plane gaps","authors":"Wenguo Gu, Pei Wang, Qiaogen Zhang, Y. Qiu, Yunping Feng","doi":"10.1109/ELINSL.1998.704727","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.704727","url":null,"abstract":"A new method for calculating low probability impulse breakdown voltages is put forward, which consists of three limiting lines: the streamer breakdown line, the low probability impulse breakdown level and the streamer corona onset line in different gas pressure ranges. The streamer breakdown line and the streamer corona onset line can be calculated using the basic knowledge of SF/sub 6/ gas insulation. If the critical pressure P/sub c/ is known, then the low probability impulse breakdown level can be predicted, because the streamer corona onset voltage and the low probability impulse breakdown voltage are of almost the same value at P/sub c/. So the expression of P/sub c/ is very useful for insulation design. In this paper, different point/plane gaps are tested, and an expression of P/sub c/ is derived based on the experimental results. Compared with the measured values for given gaps, the calculated values have a relative error no more than 2%.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"57 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":"131082564","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
The mathematical modelling of experimental data for the design of anti-contamination insulators 抗污绝缘子设计实验数据的数学建模
Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694803
R. Hernandez-Corona, J.L. Fierro Chavez, J. de la Vega
{"title":"The mathematical modelling of experimental data for the design of anti-contamination insulators","authors":"R. Hernandez-Corona, J.L. Fierro Chavez, J. de la Vega","doi":"10.1109/ELINSL.1998.694803","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.694803","url":null,"abstract":"Generally, new insulator designs are evaluated in a fog chamber by the trial and error method. Unfortunately, the mathematical equations which represent the flashover process are not considered, hence the profile achieved is not optimal. Research work was carried out in order to obtain experimental data to mathematically model the performance of a profile under polluted conditions. Equations describing the parameters (dry band phenomenon) involved in the flashover process, were established. To obtain these variables, a hollow cylindrical glass insulator was tested in a fog chamber, under various pollution levels. The equations were implemented in a computer programme. The computer programme was validated for a hollow glass insulator having a sandglass shape.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"81 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":"130940523","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
A new type of insulation structure for class H motor 一种用于H级电动机的新型绝缘结构
Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704724
Z. Lin, S. Feng, Lei Quan
{"title":"A new type of insulation structure for class H motor","authors":"Z. Lin, S. Feng, Lei Quan","doi":"10.1109/ELINSL.1998.704724","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.704724","url":null,"abstract":"We propose a design scheme for a new type of insulation structure for a class H shielded motor based on a study of the insulation systems of class H asynchronous motors and DC machines. We describe the choice of main insulation materials, such as Kapton polyimide film, flat copper wires wrapped by common Kapton film-46 composite, and a newly developed corona-resistant (CR) Kapton polyimide film-46, polyimide film glass cloth-reinforced mica paper tape and impregnating varnish, as well as their properties and technical indexes. By estimating the data of the thermally accelerated aging for this new type of insulating structure, we obtain a temperature index (TI) of 187/spl deg/C, and a thermal lifetime of 27 years by extrapolating to 150/spl deg/C. Thus, this new insulation structure not only provides a design basis for class H asynchronous machines, shielded machines and DC motors, but also improves their temperature rise and is a thin, low-cost insulation.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"60 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":"133012396","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
Investigation of breakdown in vacuum with positive and negative lightning impulse voltages in weakly nonuniform fields 弱非均匀场中正、负雷击电压真空击穿研究
Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704729
R. Arora, M. A. Goffar Khan
{"title":"Investigation of breakdown in vacuum with positive and negative lightning impulse voltages in weakly nonuniform fields","authors":"R. Arora, M. A. Goffar Khan","doi":"10.1109/ELINSL.1998.704729","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.704729","url":null,"abstract":"Experimental investigations of breakdown in vacuum up to 7.6/spl times/10/sup -6/ Torr in weakly nonuniform fields with lightning impulse voltage of either polarity are reported in this paper. From the oscillograms taken for each impulse voltage application, measured results of statistical time lag, propagation of leader and breakdown characteristics with respect to Schwaiger factor are analysed.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"24 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":"133032308","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
An experimental investigation into the partial discharge phenomenon in defective high-voltage conductors 高压缺陷导体局部放电现象的实验研究
Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694816
Raj Aggarwal, A. T. Johns, J. Jayasinghe, W. Su, J. Downes
{"title":"An experimental investigation into the partial discharge phenomenon in defective high-voltage conductors","authors":"Raj Aggarwal, A. T. Johns, J. Jayasinghe, W. Su, J. Downes","doi":"10.1109/ELINSL.1998.694816","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.694816","url":null,"abstract":"This paper presents the results of an experimental study on the partial discharge (PD) characteristics of a single EHV overhead line conductor under AC voltage conditions in a metal cage. The conductor was subjected to various defects commonly encountered in line conductors under service conditions; these included the influence of rain on the PD characteristics. The results presented show the potential for the detection and subsequent emulation of PD caused by broken strands or damaged surface in overhead lines.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"13 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":"116866872","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
Simulation of positive corona discharge in SF/sub 6/ gas by multichannel model when bidirectional diffusion of ions is considered 考虑离子双向扩散时SF/sub - 6/气体中正电晕放电的多通道模拟
Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.704726
S. Okabe, M. Sato, T. Hara
{"title":"Simulation of positive corona discharge in SF/sub 6/ gas by multichannel model when bidirectional diffusion of ions is considered","authors":"S. Okabe, M. Sato, T. Hara","doi":"10.1109/ELINSL.1998.704726","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.704726","url":null,"abstract":"Computer simulation has been widely used as a method for investigating the properties of gas discharges, where both the bidirectional drift and diffusion of all charged particles of the corona discharge under the application of voltage for long period of time have to be considered. In this paper, we simulate the positive corona of SF/sub 6/ gas in a point to plane electrode system configuration using a multichannel model considering the conditions mentioned above. In corona discharges, residual space charges formed as a result of previous discharges affect the electric field distribution, the charged particle density distribution, and the waveforms of the corona pulse current. Therefore, we compare and discuss the calculated differences by using the triple channel model, in which ion diffusion in the radial direction is considered, and using the single channel model, in which the diffusion in the direction is not considered. The differences between the waveforms of the corona pulse trains, when trigger electrons are given at intervals of a time, are also discussed. The distance that the streamer progresses is also compared. The simulation results using the multichannel model are a good approximation to the actual experimentally measured waveform of corona pulse current.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"3 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":"116033847","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
Characterization of polymeric housing materials of non-ceramic insulators after aging tests 老化试验后非陶瓷绝缘子聚合物外壳材料的特性
Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239) Pub Date : 1998-06-07 DOI: 10.1109/ELINSL.1998.694805
A. Kohli, W. Zhu, S. A. Akbar, S. Sebo, J. Sakich, T. Zhao
{"title":"Characterization of polymeric housing materials of non-ceramic insulators after aging tests","authors":"A. Kohli, W. Zhu, S. A. Akbar, S. Sebo, J. Sakich, T. Zhao","doi":"10.1109/ELINSL.1998.694805","DOIUrl":"https://doi.org/10.1109/ELINSL.1998.694805","url":null,"abstract":"A series of salt fog and UV aging tests were performed on non-ceramic insulators with different polymeric housing materials. The samples from the insulator housings were characterized before and after the aging tests using analytical techniques of X-ray photoelectron spectroscopy (XPS) and Fourier transform infra-red spectroscopy (FTIR). It was found that there is a change in elemental composition on the surface layer between the aged and non-aged samples. The change depends on the materials of the insulator housing and the aging test parameters employed.","PeriodicalId":411839,"journal":{"name":"Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239)","volume":"38 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":"117175903","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: 6
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