2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena最新文献_第5页

Oil reclamation - just a question of moisture? 石油回收-只是水分的问题?

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI: 10.1109/CEIDP.2006.312065

P. M. Mitchinson, P. Lewin, I. Hosier, G. Chen, P. Jarman

{"title":"Oil reclamation - just a question of moisture?","authors":"P. M. Mitchinson, P. Lewin, I. Hosier, G. Chen, P. Jarman","doi":"10.1109/CEIDP.2006.312065","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312065","url":null,"abstract":"High voltage equipment (e.g. transformers and switchgear), use mineral oil and paper as a cost effective and well tried insulation medium. However, this insulation is known to age over time and usage. An obvious sign of ageing is the change in the colour of the oil which changes from pale yellow to reddish brown. This colour change can be measured by the technique of ultraviolet/visual (UV/Vis) spectroscopy. Other techniques such as acid number measurement and infrared (IR) spectroscopy can also be used as indicators of the age of the oil. In general, decisions can be taken by the operator, depending upon the results of these and other tests, as to when and how to maintain the equipment. Maintenance solutions include refurbishment of the transformer or the replacement of the mineral oil. However, these treatments are expensive and a more cost effective option is to use either oil purification or reclamation in order to cleanse the system before refurbishment becomes necessary. The question then becomes: which of these two processes is the more effective? There is little up-to-date research published on the effects of fuller's earth on transformer oil. This paper considers an experiment where aged oil is processed using fuller's earth and contrasts the results of selected ageing indicators against the known results of the oil purification process.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117142447","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: 13

Interpretation of Several Key Phenomena Peculiar to Nano Dielectrics in terms of a Multi-core Model 用多核模型解释纳米电介质特有的几个关键现象

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI: 10.1109/CEIDP.2006.311928

T. Tanaka

引用次数: 42

On molecular dielectrics in their role in shaping and controlling nanodielectrics 分子电介质在纳米电介质形成和控制中的作用

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI: 10.1109/CEIDP.2006.311937

M. Frechette, C. Reed

引用次数: 13

Optical Characterization of Ionic Wind Field by Means of Laser-Induced Phosphorescence 激光诱导磷光的离子风场光学表征

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI: 10.1109/CEIDP.2006.312089

K. Aoyagi, Y. Kitahara, R. Ohyama

引用次数: 3

Numerical characterization of electrical stresses on dielectric grease of rolling bearings in induction motors fed by PWM inverters PWM逆变器驱动异步电动机滚动轴承介电脂电应力的数值表征

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI: 10.1109/CEIDP.2006.311926

C. Petrarca, G. Lupò, B. de Vivo, L. Egiziano, V. Tucci

{"title":"Numerical characterization of electrical stresses on dielectric grease of rolling bearings in induction motors fed by PWM inverters","authors":"C. Petrarca, G. Lupò, B. de Vivo, L. Egiziano, V. Tucci","doi":"10.1109/CEIDP.2006.311926","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311926","url":null,"abstract":"Pulsewidth modulated (PWM) inverters are one of the major causes of motor bearing failure in inverter-motor drive systems. The new switching devices, such as the IGBT's, characterized by high switching frequencies and faster switching times, on one side have increased the efficiency, performance and controllability of adjustable speed drives but, on the other side, have brought some relevant drawbacks. In fact, the output voltage from the inverter is not purely sinusoidal and, in particular, steep front pulses can be generated in correspondence to the commutations of switching devices. The presence of high frequency harmonics causes an uneven voltage distribution along motor windings, producing critical stresses on the motor electrical insulation; furthermore the steep pulses can excite the capacitive coupling between the stator and the rotor, resulting in shaft voltages. The latter may cause the breakdown of the lubricating film in the bearings, and the associated electric discharge machining (EDM) currents can damage the bearing and reduce its lifetime. For design purposes it seems of major importance to predict the electrical stresses on the lubricating film of rolling bearings. The present paper is dedicated to the presentation of results of numerical simulations carried out on a traction motor obtained by implementing a Multiconductor Transmission Line (MTL) model of the overall system composed of the power voltage, the feeding cable, the motor stator winding, the rotor shaft and the bearings. The influence on the shaft voltages of parameters like the amplitude and slew rate (dV/dt) of the applied voltage, the cable length, is discussed.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124843511","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

On-line time domain reflectometry measurements of temperature variations of an XLPE power cable XLPE电力电缆温度变化的在线时域反射测量

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI: 10.1109/CEIDP.2006.312059

V. Dubickas, H. Edin

引用次数: 16

Partial discharge measurements in a high temperature superconducting triaxial 5-m model cable at liquid nitrogen temperature 液氮温度下高温超导三轴5m模型电缆局部放电测量

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI: 10.1109/CEIDP.2006.312019

I. Sauers, D. James, E. Tuncer, A. Ellis, M. Pace

引用次数: 1

Polarity Effect and Flow Characteristics of Wire-Rod Type Electrohydrodynamic Gas Pump 杆式电液动力气泵的极性效应及流动特性

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI: 10.1109/CEIDP.2006.312091

B. Komeili, J. Chang, G. Harvel

引用次数: 9

Correlation of partial discharge and dissolved gas analysis results from discharge activity in SRBP SRBP放电活动的局部放电与溶解气体分析结果的相关性

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI: 10.1109/CEIDP.2006.312113

M.A. Brown, S. Dodd, B. Ahern, J. Pettinger, F. Waite

{"title":"Correlation of partial discharge and dissolved gas analysis results from discharge activity in SRBP","authors":"M.A. Brown, S. Dodd, B. Ahern, J. Pettinger, F. Waite","doi":"10.1109/CEIDP.2006.312113","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312113","url":null,"abstract":"The use of appropriate condition assessment criteria for the continued service of synthetic resin bonded paper (SRBP) based insulation is necessary for the continued operation or lifetime extension of SRBP based HV plant. Here, we report on work undertaken to investigate quantitatively the relationship between partial discharge activity occurring within the SRBP core with the production/absorption of decomposition gas in the surrounding oil. The emphasis of the results was to look at gases typically observed in transformers and associated bushings and their rate of production. Gas production rates considered here include H2, CO, CH4, C2H2, C2H4, and C2H6. Constant stress ac tests were conducted on pin-plane geometry SRBP samples, which were immersed in transformer oil. During each test, the partial discharge activity over the duration of the tests was monitored and complemented by periodic sampling of the surrounding oil for dissolved gas analysis (DGA). Prior to the experiments, the SRBP samples were conditioned to produce varying amounts of absorbed oil and moisture absorption. The results of DGA on the oil, including the variation of gas evolution as a function of partial discharge activity, and chemical status (i.e. amount of oil/moisture) are discussed.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133955630","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: 4

Studies of TiO2 Breakdown Under Pulsed Conditions 脉冲条件下TiO2击穿的研究

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI: 10.1109/CEIDP.2006.311941

G. Zhao, R. Joshi, V. Lakdawala, E. Schamiloglu, H. Hjalmarson

引用次数: 0