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2011 Electrical Insulation Conference (EIC).最新文献

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Partial discharge characteristics of electrical trees in XLPE power cables 交联聚乙烯电力电缆中电气树的局部放电特性
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996123
Tianchun Zhou, Lijun Yang, R. Liao, Quan Zhou, Di Ye
{"title":"Partial discharge characteristics of electrical trees in XLPE power cables","authors":"Tianchun Zhou, Lijun Yang, R. Liao, Quan Zhou, Di Ye","doi":"10.1109/EIC.2011.5996123","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996123","url":null,"abstract":"This paper studies the initiation process and the PD characteristics of electrical trees, and proposes a new method to recognize the growth state of electrical trees. The experiment result show that the electrical trees PD energy mainly concentrated in the −40°∼90° and 120°∼250° of 5MHz∼7.5MHz, −20°∼90° and 150∼250° of 7.5MHz∼10MHz. With the dense increase of the electrical trees, the more PD energy will be found in the frequency 7.5MHz∼10MHz. At the first development stage of electrical trees, the PD energy mainly located at the frequency 5MHz∼7.5MHz, when electrical trees develop to the next stage, the more PD energy will be found at the frequency 7.5MHz∼10MHz.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127045447","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
Rating methods for cables installed in unventilated and partially ventilated surface troughs 安装在不通风和部分通风槽面的电缆的额定值方法
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996119
J. Pilgrim, D. Swaffield, P. Lewin, D. Payne
{"title":"Rating methods for cables installed in unventilated and partially ventilated surface troughs","authors":"J. Pilgrim, D. Swaffield, P. Lewin, D. Payne","doi":"10.1109/EIC.2011.5996119","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996119","url":null,"abstract":"Cables installed in surface troughs are a critical part of many transmission circuits. This paper presents a method for calculating the rating of such circuits using computational fluid dynamics techniques, applied to two common trough designs. One design has solid concrete lids while for the second some lids are replaced by grilles to encourage natural air circulation. For the case of covered troughs with solid concrete lids, the IEC 60287 method was found to be conservative owing to its failure to consider the thermal impact of the ground. Good agreement was observed between the CFD model and an improved analytical formulation by Anders. Modeling of partially ventilated troughs, which at present cannot be rated analytically, shows continuous rating increases of up to 31% over the covered design owing to greater air circulation.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114745382","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
Comparative AC and DC voltage endurance tests performed on Roebel bars 在罗贝尔棒上进行交流和直流电压耐久性比较试验
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996201
C. Millet, M. Bélec, C. Guddemi
{"title":"Comparative AC and DC voltage endurance tests performed on Roebel bars","authors":"C. Millet, M. Bélec, C. Guddemi","doi":"10.1109/EIC.2011.5996201","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996201","url":null,"abstract":"Measurement of the charging and discharging current of stator winding insulation under DC high voltage is one of the tests used in the condition assessment of rotating machines. Since the high voltage may be applied for a relatively long period of time during the charging of the winding, its value can be a matter of concern. No aging of the insulation under test should occur while the condition assessment is performed. In order to be able to compare the aging effect of AC and DC high voltage on the groundwall insulation of a stator winding, the so-called Voltage Endurance Test (VET) was performed on 12 spare 13.8-kV Roebel bars. Half the test specimens were subjected to a voltage of 35 kVac; for this test, a ratio of 1.7 between direct voltage and power frequency voltage (rms) was used. The other half were then tested at a voltage of 59.5 kVdc. This paper presents the results of this comparative VET between AC and DC voltages performed on epoxy-mica based insulation of hydro-generator Roebel bars.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125015159","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
Evaluation of the influence of nano fillers on the electrical and dielectric properties of epoxy resin 纳米填料对环氧树脂电性能和介电性能影响的评价
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996207
M. M. S. Shirazi, H. Borsi, E. Gockenbach
{"title":"Evaluation of the influence of nano fillers on the electrical and dielectric properties of epoxy resin","authors":"M. M. S. Shirazi, H. Borsi, E. Gockenbach","doi":"10.1109/EIC.2011.5996207","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996207","url":null,"abstract":"Nano fillers have been found in recent years in several areas of technology and can cause electrical, mechanical and chemical improvements. In this study, host material, namely bisphenol-A epoxy resin as indoor application, and related micro filler are the same for all produced samples. Al2O3 has been considered as nano fillers. Nano fillers were mixed with the host material using ultrasound device and high speed mixer simultaneously. An even distribution of the nano fillers was validated by means of transmission electron microcopy. The investigations were carried out under homogeneous (plane-plane) and inhomogeneous (rod-plane) electric field configuration. The influences of the amount of the nano fillers up to 10% part by weight (pbw) and the temperature from 23 °C to 180 °C on the partial discharge (PD) inception voltage and breakdown voltage of the specimens are investigated.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129106360","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
Dry testing of non-conductive liners 不导电衬垫的干燥试验
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996212
William R Karslo, Theresa I Karslo
{"title":"Dry testing of non-conductive liners","authors":"William R Karslo, Theresa I Karslo","doi":"10.1109/EIC.2011.5996212","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996212","url":null,"abstract":"The invention generally relates to dielectric testing of non-conductive bucket liners for mobile aerial man-lift equipment where two conductive shaped materials are placed on opposite sides of a dielectric material being tested. High voltage is applied to one of the conductive materials while a ground lead is attached to the other. Electrical current is measured from the grounded conductive material to identify any breakdown of the dielectric properties of the material being tested [1].","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130021642","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
Electromagnetic interference (EMI) testing of electrical equipment 电气设备的电磁干扰(EMI)测试
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996174
C. Maughan
{"title":"Electromagnetic interference (EMI) testing of electrical equipment","authors":"C. Maughan","doi":"10.1109/EIC.2011.5996174","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996174","url":null,"abstract":"Assessment of the condition of electric machinery in a power plant has always been difficult. The standard on-line monitoring instrumentation is particularly deficient on generators. Specialized devices can be added to improve capability somewhat, e.g., generator condition monitor, flux probe for field turn shorts, stator endwinding vibration instrumentation, and partial discharge (PD) instrumentation.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"323 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116775227","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
The testing methodologies of service aged medium voltage power cables as applied to an operating wind farm 应用于运行中的风电场的服役老化中压电力电缆的测试方法
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996191
M. Moore
{"title":"The testing methodologies of service aged medium voltage power cables as applied to an operating wind farm","authors":"M. Moore","doi":"10.1109/EIC.2011.5996191","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996191","url":null,"abstract":"As wind turbines quickly spread throughout the USA, many wind generation sites were designed, developed and installed very quickly and not always with long term dependability in mind. This review of cable testing methods used in both acceptance testing and annual maintenance practices will discuss the strengths and weaknesses of the various methodologies in wind farm applications. Also discussed will be a method for a time based approach to cable maintenance testing and how to develop standards and qualify personnel for the procedures.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117101483","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
Novel high performances epoxy/anhydride formulations and their application in electrical insulation 新型高性能环氧/酸酐配方及其在电绝缘中的应用
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996198
L. Valette, L. Jiang, D. Ji, K. Karunakaran
{"title":"Novel high performances epoxy/anhydride formulations and their application in electrical insulation","authors":"L. Valette, L. Jiang, D. Ji, K. Karunakaran","doi":"10.1109/EIC.2011.5996198","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996198","url":null,"abstract":"Epoxy/anhydride formulations are known for their excellent combination of thermo-mechanical properties combined with superior electrical insulation and are widely used in electrical insulation. Such formulations lead to thermosets which demonstrate superior chemical resistance even when exposed to harsh environments. The high cross-linking density combined with the inherent stability of the chemical bonds of the epoxy based network provides cured products with high thermal stability. The use of conventional epoxy/anhydride systems is potentially limited by their relative brittleness. The compositions are especially sensitive to thermal cycling or thermal shock that could result from inadequate processing conditions or in-use aging. The micro-cracks which may be formed during these thermal events drastically reduce the physical and electrical properties of the electrical components. The flexibilization of the epoxy/anhydride network has been used to remedy this issue. Better toughness is then achieved by scarifying the overall thermal stability of the product, i.e. by reducing the glass transition temperature. The objective of this work is to demonstrate that it is possible to greatly enhance the mechanical properties with minimal impact on thermal resistance by using separated toughening agents. After its fundamental evaluation, the new concept was applied to practical formulations used in electrical insulation.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117248594","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
Sensitivity in partial discharge detection 局部放电检测的灵敏度
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996138
Mu-kuen Chen, Chao-Yuan Cheng, Jeng-Ming Chen
{"title":"Sensitivity in partial discharge detection","authors":"Mu-kuen Chen, Chao-Yuan Cheng, Jeng-Ming Chen","doi":"10.1109/EIC.2011.5996138","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996138","url":null,"abstract":"Acoustic sensors are extensively used for detecting the partial discharge (PD) in power equipment [1,2]. Picking up the PD signals from different positions can help locate where PD occurs. As for noise, the intensity of PD impulses should be strong enough to be detected by the acoustic sensor. In this study, we evaluated the performance of the acoustic sensor and RF coils in two different configurations. In the first configuration, the RF coils detect PD impulses from an area larger than that sensed by the acoustic sensor. In the other configuration, the two types of sensor detect the PD signals from the same area. Results show that the sensitivity of RF coils is 40–100 times higher than that of the acoustic sensor in the two configurations. Occurrences of PD impulses seen on the 500-MHz scope reveal that RF coils can sense far more PD signals than the acoustic sensor. In sum, RF coils show high sensitivity and better performance in locating PD in power equipment.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122588871","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
Novel online RF technique for detection of water trees in underground powered distribution cables 一种新的地下配电电缆水树在线射频检测技术
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996175
A. González, I. Paprotny, R. White, P. Wright
{"title":"Novel online RF technique for detection of water trees in underground powered distribution cables","authors":"A. González, I. Paprotny, R. White, P. Wright","doi":"10.1109/EIC.2011.5996175","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996175","url":null,"abstract":"In this paper we investigate the use of RF signals to measure dielectric loss and the change of permittivity of an energized cable's insulation. One common degradation mechanism is growth of water trees in the presence of water. We present theoretical analysis of a novel on-line water tree detection technique based on using RF TEM wave propagation via test points on an elbow. Our method is based on injecting a high frequency RF signal into an energized cable at different points of the line voltage values and measure the nonlinearity of permittivity and dielectric loss.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116527122","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
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