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IEEE Transactions on Electrical Insulation最新文献

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The effect of a metallic particle near a spacer on flashover phenomena in SF/sub 6/ 靠近间隔的金属颗粒对SF/ sub6 /中闪络现象的影响
IEEE Transactions on Electrical Insulation Pub Date : 1993-04-01 DOI: 10.1109/14.212247
B. Mazurek, J. Cross, R. V. Heeswijk
{"title":"The effect of a metallic particle near a spacer on flashover phenomena in SF/sub 6/","authors":"B. Mazurek, J. Cross, R. V. Heeswijk","doi":"10.1109/14.212247","DOIUrl":"https://doi.org/10.1109/14.212247","url":null,"abstract":"A study of the flashover mechanism initiated by metallic particles in SF/sub 6/ gas is presented. Using a high-speed Imacon photographic camera, it was established that a metallic particle near the insulator surface plays an important role in flashover development. The influence of the particle on flashover development depends on the pressure of the SF/sub 6/ gas. At atmospheric pressure, the flashover was always initiated at a point on the particle farthest from the nearest electrode. At high pressures, it was found that breakdown develops from the electrode of relative positive polarity in the form of a leader. The velocity of the discharge crossing the gap increases exponentially when the distance between the particle and the insulator surface decreases. >","PeriodicalId":13105,"journal":{"name":"IEEE Transactions on Electrical Insulation","volume":"16 1","pages":"219-229"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74016712","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: 23
A reliable algorithm for the exact median rank function 精确中位数秩函数的可靠算法
IEEE Transactions on Electrical Insulation Pub Date : 1993-04-01 DOI: 10.1109/14.212241
J. Jacquelin
{"title":"A reliable algorithm for the exact median rank function","authors":"J. Jacquelin","doi":"10.1109/14.212241","DOIUrl":"https://doi.org/10.1109/14.212241","url":null,"abstract":"This short communication deals with the practical computation of the median rank function, F(i,n). F is the estimator of the cumulative probability of failure for the ith of n identically stressed samples. The exact values of the median rank function are easy to compute, using a reliable and easy-to-code algorithm presented in this paper. >","PeriodicalId":13105,"journal":{"name":"IEEE Transactions on Electrical Insulation","volume":"30 1","pages":"168-171"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77918037","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: 32
Use of hidden Markov models for partial discharge pattern classification 使用隐马尔可夫模型进行局部放电模式分类
IEEE Transactions on Electrical Insulation Pub Date : 1993-04-01 DOI: 10.1109/14.212242
L. Satish, B. Gururaj
{"title":"Use of hidden Markov models for partial discharge pattern classification","authors":"L. Satish, B. Gururaj","doi":"10.1109/14.212242","DOIUrl":"https://doi.org/10.1109/14.212242","url":null,"abstract":"An attempt was made to use hidden Markov models (HMM) to classify partial discharge (PD) image patterns. After an introduction to HMM, the methodology and algorithms for evolving them are explained. The selection of the model and training parameters and the results obtained are discussed. The utility of the approach is evaluated by applying it to five types of actual PD image patterns. The performance of the HMM approach is shown to exceed that of neural networks. >","PeriodicalId":13105,"journal":{"name":"IEEE Transactions on Electrical Insulation","volume":"3 1","pages":"172-182"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82005980","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: 96
Thermally stimulated current technique to evaluate polymer degradation due to water treeing 热刺激电流技术，以评估聚合物降解由于水树
IEEE Transactions on Electrical Insulation Pub Date : 1993-04-01 DOI: 10.1109/14.212255
S. Bamji, A. Bulinski, Y. Chen
{"title":"Thermally stimulated current technique to evaluate polymer degradation due to water treeing","authors":"S. Bamji, A. Bulinski, Y. Chen","doi":"10.1109/14.212255","DOIUrl":"https://doi.org/10.1109/14.212255","url":null,"abstract":"The thermally stimulated current (TSC) technique has been used to evaluate the degradation of polymeric insulation containing water trees. It is shown that, compared to the capacitance and tan- delta measurements, the TSC technique is more sensitive and can detect the degradation caused by water treeing. The TSC spectra change with the aging time of the polymeric insulation and the length of the water tree. >","PeriodicalId":13105,"journal":{"name":"IEEE Transactions on Electrical Insulation","volume":"8 1","pages":"299-302"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74134409","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: 16
Impulse flashover trajectory in air in nonuniform fields 非均匀场空气中脉冲闪络轨迹
IEEE Transactions on Electrical Insulation Pub Date : 1993-04-01 DOI: 10.1109/14.212245
D. B. Watson, S. K. Kho, K. Samuels, L. Ma, J. Chiu
{"title":"Impulse flashover trajectory in air in nonuniform fields","authors":"D. B. Watson, S. K. Kho, K. Samuels, L. Ma, J. Chiu","doi":"10.1109/14.212245","DOIUrl":"https://doi.org/10.1109/14.212245","url":null,"abstract":"A video camera has been used to categorize the flashover tracks between point-to-plane and wire-to-plane electrodes. Positive impulse flashover produces zigzag and forked tracks, while negative voltages produce smooth tracks. The location of the impact on the plane electrode was found to be a function of the applied voltage and the length of the gap. A space-charge model is put forward to explain these results. >","PeriodicalId":13105,"journal":{"name":"IEEE Transactions on Electrical Insulation","volume":"192 1","pages":"200-208"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72818358","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
Dynamic arc modeling of pollution flashover of insulators under DC voltage 直流电压下绝缘子污闪的动态电弧建模
IEEE Transactions on Electrical Insulation Pub Date : 1993-04-01 DOI: 10.1109/14.212246
R. Sundararajan, R. Gorur
{"title":"Dynamic arc modeling of pollution flashover of insulators under DC voltage","authors":"R. Sundararajan, R. Gorur","doi":"10.1109/14.212246","DOIUrl":"https://doi.org/10.1109/14.212246","url":null,"abstract":"A dynamic model that computes the flashover voltages of polluted insulators energized with DC voltage is presented. The salient feature of this model is that it takes into account the configuration of the insulator profile at every instant, which plays an important role in the flashover process of the DC polluted insulators. A number of practical insulator geometries have been studied, and the validity of the model is verified by comparing the computed results with the experimental results of previous researchers. >","PeriodicalId":13105,"journal":{"name":"IEEE Transactions on Electrical Insulation","volume":"21 1","pages":"209-218"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79088107","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: 160
Streamer formation and Monte Carlo space-charge field calculation in SF/sub 6/ SF/sub / 6中拖缆形成和蒙特卡罗空间电荷场计算
IEEE Transactions on Electrical Insulation Pub Date : 1993-04-01 DOI: 10.1109/14.212251
J. Liu, G. Raju
{"title":"Streamer formation and Monte Carlo space-charge field calculation in SF/sub 6/","authors":"J. Liu, G. Raju","doi":"10.1109/14.212251","DOIUrl":"https://doi.org/10.1109/14.212251","url":null,"abstract":"A Monte Carlo simulation is carried out for SF/sub 6/ in uniform electric fields, with 7% and 14% overvoltages and at two gas densities at each overvoltage. The electron motion and avalanche growth are simulated by tracing individual paths, and the effect of space charge is included by solving the Poisson equation. The streamer propagation, the electron and positive and negative ion distributions and space charge fields are studied in detail as more time has lapsed after voltage application. The simulated streamer shape explains for the first time the dark space in SF/sub 6/ streamers observed experimentally. It is found that the mechanism of streamer propagation in an attaching gas is different from that in a nonattaching gas. The maximum field enhancement is just behind the streamer or between two successive streamers in SF/sub 6/. The anode-directed streamer propagates with a velocity of 10/sup 7/ to 10/sup 8/ cm/s, depending on the percentage of overvoltage and the gas number density. >","PeriodicalId":13105,"journal":{"name":"IEEE Transactions on Electrical Insulation","volume":"37 1","pages":"261-270"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91308279","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
Study of charge storage properties in biaxially oriented polypropylene 双轴取向聚丙烯电荷存储性能的研究
IEEE Transactions on Electrical Insulation Pub Date : 1993-04-01 DOI: 10.1109/14.212254
P. Karanja, R. Nath
{"title":"Study of charge storage properties in biaxially oriented polypropylene","authors":"P. Karanja, R. Nath","doi":"10.1109/14.212254","DOIUrl":"https://doi.org/10.1109/14.212254","url":null,"abstract":"The charge storage properties of corona-charged biaxially oriented polypropylene (BOPP) and unoriented polypropylene (PP) films have been studied. Thermally stimulated charge decay and open and short circuit thermally stimulated currents, were measured. A half-value charge decay temperature for BOPP was T/sub 0.4/=118 degrees C, 20 degrees C higher than for PP, hence giving greater charge storage stability for BOPP. The charge storage in BOPP is attributed predominantly to impurity trapping and space charge mechanisms. X-ray and differential scanning calorimetry methods were employed to obtain structural information. >","PeriodicalId":13105,"journal":{"name":"IEEE Transactions on Electrical Insulation","volume":"60 1","pages":"294-298"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82622643","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: 24
Discussion, with reply, on `Assessment of deterioration in epoxy/mica machine insulation' by Y.J. Ki Ki yj关于“环氧树脂/云母机器绝缘劣化的评估”的讨论与回复
IEEE Transactions on Electrical Insulation Pub Date : 1993-04-01 DOI: 10.1109/14.212256
M. Danikas
{"title":"Discussion, with reply, on `Assessment of deterioration in epoxy/mica machine insulation' by Y.J. Ki","authors":"M. Danikas","doi":"10.1109/14.212256","DOIUrl":"https://doi.org/10.1109/14.212256","url":null,"abstract":"The commenters raise some questions regarding the measurements reported in the above titled paper (ibid., vol.27, pp.1026-39, October 1992) and their meaning. J.K. Nelson answers some of the questions in terms of the paper's objectives. >","PeriodicalId":13105,"journal":{"name":"IEEE Transactions on Electrical Insulation","volume":"108 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86325313","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
Dielectric breakdown in nonuniform field air gaps 非均匀场气隙中的介电击穿
IEEE Transactions on Electrical Insulation Pub Date : 1993-04-01 DOI: 10.1109/14.212243
N. L. Allen, M. Boutlendj, H. A. Lightfoot
{"title":"Dielectric breakdown in nonuniform field air gaps","authors":"N. L. Allen, M. Boutlendj, H. A. Lightfoot","doi":"10.1109/14.212243","DOIUrl":"https://doi.org/10.1109/14.212243","url":null,"abstract":"The sparkover characteristics of rod-rod and rod-plane gaps in air under DC voltages are reviewed. The linear characteristics of both configurations are associated with the prominence of streamer discharges during the prebreakdown phase. The limits of linearity are shown to be a function of humidity, gap spacing and electrode profile, all of which determine the predischarge mode. It is shown that the rod-plane gap offers a wider range of linearity than the rod-rod gap and that it can have a valid role as a DC voltage measurement tool. >","PeriodicalId":13105,"journal":{"name":"IEEE Transactions on Electrical Insulation","volume":"103 1","pages":"183-191"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80660927","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: 24
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