Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.最新文献_第9页

Power and energy of futuristic automobiles 未来汽车的动力和能源

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Pub Date : 1900-01-01 DOI: 10.1109/EEIC.2005.1566332

I. Castillo

引用次数: 0

The history and processing of ultra-high molecular weight polyethylene (UHMWPE) for surgical implantation 外科植入用超高分子量聚乙烯(UHMWPE)的历史和工艺

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Pub Date : 1900-01-01 DOI: 10.1109/EEIC.2005.1566331

C. Cucinelli

引用次数: 0

A new diagnostic tool for preventive maintenance on large generators-PD location in stator windings by the traveling wave method 一种新的大型发电机预防性维修诊断工具——行波法定子绕组局部放电定位

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Pub Date : 1900-01-01 DOI: 10.1109/EEIC.2005.1566261

R. Koch, F. Pohlmann, J. R. Weidner

{"title":"A new diagnostic tool for preventive maintenance on large generators-PD location in stator windings by the traveling wave method","authors":"R. Koch, F. Pohlmann, J. R. Weidner","doi":"10.1109/EEIC.2005.1566261","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566261","url":null,"abstract":"The development of cost-effective maintenance strategies requires diagnostic tools which detect any defects as early as possible to enable the determination and selective planning of the requisite repair measures. The sensitive partial discharge (PD) measurement method enables the detection of individual weak points developing in generator high voltage stator insulation in their initial stages. However, a reliable evaluation also requires the most exact possible knowledge of the location of the insulation where partial discharge occurs. The following paper presents a method enabling the precise localization of internal partial discharges in the shielded slot section of stator windings based on the localization principle of transit time difference measurement between the two sides of the stator core. The PD pulses are decoupled from the winding bars using a patented new type of sensor, digitized at a high sampling rate of 4 GS/s and subjected to mathematical analysis. Measurements on old winding bars from large generators and on complete stator windings (40-1640 MVA) yield high localization accuracies within the range of centimeters. In a rewound 880 MVA generator with an active core length of 6.6 m, a partial discharge source was localized which could not be detected by conventional equipment at the generator terminals. This demonstrates the excellent sensitivity of the new diagnostic tool","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131925648","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

An evaluation of diagnostic techniques relevant to arcing fault current interrupters for direct current power systems in future aircraft 未来飞机直流电源系统电弧故障断流诊断技术评价

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Pub Date : 1900-01-01 DOI: 10.1109/EEIC.2005.1566277

R. Spyker, D. Schweickart, J. Horwath, L. Walko, D. Grosjean

{"title":"An evaluation of diagnostic techniques relevant to arcing fault current interrupters for direct current power systems in future aircraft","authors":"R. Spyker, D. Schweickart, J. Horwath, L. Walko, D. Grosjean","doi":"10.1109/EEIC.2005.1566277","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566277","url":null,"abstract":"Arc fault circuit interrupters (AFCI) are a relatively new development in the area of circuit protection. Typical circuit breakers are designed to detect an overload current in the protected circuit and trip open within a specified period of time. The AFCI is a device that detects and interrupts an arcing fault when it occurs. An arc fault is a dangerous situation with very high temperatures in the arc. These high temperatures are sufficient to ignite wire insulation and other combustibles in the vicinity of the arc. Standard circuit breakers and ground fault circuit breakers generally will not trip in the event of an arc fault since there is sufficiently high impedance in the circuit to limit current below the trip level of its characteristic curve. Numerous arc faults that have been observed on aging aircraft, due to failing insulation, have spurred an interest in AFCIs for both commercial and military aircraft. Such AFCIs assess the AC current waveform to distinguish that an arc is occurring in the circuit. When this occurs, the AFCI will open to mitigate damage to the wiring system. In the AC case, the opening device will generally take advantage of the natural current zero in the AC wave form to clear the circuit. Protective devices for DC systems cannot exploit this characteristic. In addition, the charge transport properties (conductivity) of the DC arc are affected by the gas density (i.e., altitude) surrounding the arc. This paper presents experimental results intended to help evaluate the potential applicability of the typical diagnostics used in AC AFCIs as a valid means of detecting a series DC arc. This is particularly relevant to future aircraft power systems employing 270 Volt DC distribution. Also, these DC arcs have been characterized at low atmospheric pressures to simulate high altitude operation","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133605634","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: 29

Study of on-line monitoring method of partial discharge for power transformers based on RFCT and microstrip antenna 基于RFCT和微带天线的电力变压器局部放电在线监测方法研究

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Pub Date : 1900-01-01 DOI: 10.1109/EEIC.2005.1566268

Cheng Yonghong, Chen Yu, Liu Tong, Xun Xiaowei, Ji Linlie, Chen Wei, Chen Lixin

{"title":"Study of on-line monitoring method of partial discharge for power transformers based on RFCT and microstrip antenna","authors":"Cheng Yonghong, Chen Yu, Liu Tong, Xun Xiaowei, Ji Linlie, Chen Wei, Chen Lixin","doi":"10.1109/EEIC.2005.1566268","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566268","url":null,"abstract":"It is an important means for partial discharge (PD) on-line monitoring of oil-immersed power transformers in order to evaluating the insulation condition. Radio frequency current transducers (RFCT) are applied to couple the PD pulse current signal, and the difference-balance pairs (one of three-phase bushing-tap grounding terminals respectively corresponded with the neutral or iron core terminal) are selected, and high speed data acquisition card is adopt to sample the PD signal (>10MS/s) from the balance pair, and further amplitude modulation, phase modulation and difference arithmetic is designed, then external electromagnetic interference is effectively suppressed and it is propitious to extracting PD pulses and judge the PD occurrence place. The wideband PD couplers based on microstrip antenna are also applied to detect the high frequency PD pulse signal. Four sensors are installed at the special parts on the transformer where PD electromagnetic wave signal can be received, then the signal is transmitted to the input analog channel of the oscilloscope (>IGS/s). So single PD waveform analysis throughout more wide frequency band can be done, and further PD fault location can also be realized. The PD on-line monitoring system based on the above two monitoring methods for in-service transformer has also been developed and installed at one main transformer in a plant (220/18RV, 360MVA, three phase and dual winding)","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122825544","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

An ultracapacitor-powered race car update 超级电容器驱动的赛车更新

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Pub Date : 1900-01-01 DOI: 10.1109/EEIC.2005.1566305

P. Carter, J. Baxter, T. Newill, T. Erekson

引用次数: 2

Measurement and analysis of partial discharge in switchgear 开关柜局部放电的测量与分析

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Pub Date : 1900-01-01 DOI: 10.1109/EEIC.2005.1566291

C. Kane, I. Blokhintsev, A. Golubev

引用次数: 4

Thermally upgraded insulation in transformers 变压器的热升级绝缘

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Pub Date : 1900-01-01 DOI: 10.1109/EEIC.2005.1566272

T. Prevost

引用次数: 39

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Pub Date : 1900-01-01 DOI: 10.1109/EEIC.2005.1566280

G. Stone

引用次数: 6

Prototypes of polymer-impregnated reforested wood crossarms subjected to partial discharge tests 经局部放电试验的聚合物浸渍再造林木材横木的原型

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Pub Date : 1900-01-01 DOI: 10.1109/EEIC.2005.1566295

R. Altafim, R. Woschitz, C. Ribeiro, M. Muhr, J.F.R. Silva, C. Calil, H. C. Basso, C. Sumereder, R. Altafim, A. Silveira

{"title":"Prototypes of polymer-impregnated reforested wood crossarms subjected to partial discharge tests","authors":"R. Altafim, R. Woschitz, C. Ribeiro, M. Muhr, J.F.R. Silva, C. Calil, H. C. Basso, C. Sumereder, R. Altafim, A. Silveira","doi":"10.1109/EEIC.2005.1566295","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566295","url":null,"abstract":"Brazil's vast territory and huge forested regions have contributed to the widespread use of traditional crossarms made of native wood species in distribution lines. However, this situation is changing due to the increasingly high cost of native species and Brazil's environmental laws. In response to these changes, electric power suppliers have been seeking alternatives, and prototypes of reforested wood crossarms (such as Eucalyptus citriodora) impregnated with polymer (castor oil-based polyurethane resin) have been studied for application as mechanical supports for electrical power distribution systems, with very satisfactory results. This paper discusses mechanical and electrical tests conducted on this new material under critical conditions of temperature and relative air humidity. Also presented are the results of electrical tests conducted at Graz Technology University's Institute of High Voltage Engineering and System Management in Austria to analyze the material's insulation performance under electrical stress particularly under partial discharge during critical operating conditions","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126850094","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