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2007 Electrical Insulation Conference and Electrical Manufacturing Expo最新文献

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Use of ramp test to expedite return to service of damaged stator winding 使用斜坡试验加速损坏的定子绕组恢复工作
2007 Electrical Insulation Conference and Electrical Manufacturing Expo Pub Date : 2007-10-01 DOI: 10.1109/EEIC.2007.4562620
W. McDermid, R. Gamblin
{"title":"Use of ramp test to expedite return to service of damaged stator winding","authors":"W. McDermid, R. Gamblin","doi":"10.1109/EEIC.2007.4562620","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562620","url":null,"abstract":"The fracture of a clamping finger resulted in major damage to the stator core and winding of a 13.8 kV 120 MVA hydro generator. Immediately following the fault the fire suppression water deluge system operated for a period of time. The polyester bonded mica insulation system of this stator winding is known to be vulnerable to tape separations in the end arm area. High direct-voltage ramp tests were used on four occasions to: ldr Identify stator coils needing replacement ldr Determine adequacy of hot air drying ldr Determine adequacy of drying under short circuit conditions ldr Monitor subsequent improvement in service The objective was to return the unit to service as quickly as possible in the expectation that the condition of the groundwall insulation would continue to improve. To date this approach has been successful.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127439111","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
New IEC standards for qualifying stator insulation systems for PWM converter drives PWM变换器驱动定子绝缘系统合格的新IEC标准
2007 Electrical Insulation Conference and Electrical Manufacturing Expo Pub Date : 2007-10-01 DOI: 10.1109/EEIC.2007.4562596
G. Stone, M. Stranges
{"title":"New IEC standards for qualifying stator insulation systems for PWM converter drives","authors":"G. Stone, M. Stranges","doi":"10.1109/EEIC.2007.4562596","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562596","url":null,"abstract":"Premature failure is sometimes suffered by stator insulation systems of variable speed motors driven by modern voltage source pulse width modulated (PWM) converters. The failure mechanism in random wound stators is generally thermal. Form wound stators fail through dielectric loss-induced heating, rapid deterioration of stress control coatings and partial discharge (PD). The International Electrotechnical Commission (IEC) has developed two new documents to provide guidance on qualification of stator insulation systems subject to voltage surges from PWM drives. IEC 60034-18-41 discusses the qualification and acceptance tests for random windings not expected to see PD during normal operation; it was published in 2006. IEC 60034-8-42 covers form-wound stators, whose insulation design is expected to withstand PD in operation. The latter document is still under development and near completion. This paper describes the main features of one of the most important new machine insulation standards to be issued in many years.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115090878","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
Suggestions to augment the IEC60270 partial discharge standard in relation to radiated electromagnetic energy 对IEC60270有关辐射电磁能量部分放电标准的补充建议
2007 Electrical Insulation Conference and Electrical Manufacturing Expo Pub Date : 2007-10-01 DOI: 10.1109/EEIC.2007.4562614
B. Stewart, M. Judd, A. Reid, R. Fouracre
{"title":"Suggestions to augment the IEC60270 partial discharge standard in relation to radiated electromagnetic energy","authors":"B. Stewart, M. Judd, A. Reid, R. Fouracre","doi":"10.1109/EEIC.2007.4562614","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562614","url":null,"abstract":"The IEC60270 standard has become the key reference for general measurement of partial discharge (PD) in high voltage. This paper discusses the need to include reference to radiated emissions within this standard alongside the additional PD detection techniques outlined in the Annex. The paper suggests that the Annex should in the future also make reference to combined simultaneous IEC60270 and RF measurement systems allowing traditional apparent charge measurements to be complimented by knowledge of the radiated signals. The issues of RF calibration through the deployment of a combined measurement system are also discussed as well as the potential of a combined apparent charge and RF system to help further identify basic PD fault types.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"217 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134299864","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: 7
Crosslinking and electrical characterization of metallocene linear low density polyethylene 茂金属线性低密度聚乙烯的交联及电学表征
2007 Electrical Insulation Conference and Electrical Manufacturing Expo Pub Date : 2007-10-01 DOI: 10.1109/EEIC.2007.4562593
S. J. Han, L. Gross
{"title":"Crosslinking and electrical characterization of metallocene linear low density polyethylene","authors":"S. J. Han, L. Gross","doi":"10.1109/EEIC.2007.4562593","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562593","url":null,"abstract":"One of the most important factors affecting macroscopic physical properties of polyethylene is the microstructure of the polymer chain. For example, the crystallinity of polyethylene is significantly controlled by the molecular architecture. Metallocene linear low density polyethylene features unique characteristics of a narrow molecular weight distribution and uniform composition distribution. In order to investigate the influence of polymer structure on the crosslinking and electrical properties of polyethylene, metallocene linear low density polyethylene samples with different degrees of short chain branching groups are evaluated. The cure behavior is studied through the rate of organic peroxide decomposition in a moving die rheometer, followed by cure kinetics analysis. The dielectric properties are studied as a function of degree of crystallinity, which is originated from the content of short chain branching in metallocene linear low density polyethylene.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131166526","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
Analysis of over-voltage protecting techniques applied to over-head insulated lines 架空绝缘线路过电压保护技术分析
2007 Electrical Insulation Conference and Electrical Manufacturing Expo Pub Date : 2007-10-01 DOI: 10.1109/EEIC.2007.4562576
Min Luo, Fengmin Yang, Luxian Jiang
{"title":"Analysis of over-voltage protecting techniques applied to over-head insulated lines","authors":"Min Luo, Fengmin Yang, Luxian Jiang","doi":"10.1109/EEIC.2007.4562576","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562576","url":null,"abstract":"To protect over-head insulated power distribution lines from surge over-voltage breakdown, even when a line conductor is melted down when lighting striking on the lines, nonlinear over-voltage protectors and low melting point discharge insulators are used as primary over-voltage protection techniques and have been widely applied in China for more than 5 years. The factual protecting effects of the two protection techniques were compared, discussed and analyzed in this paper based on their practical experiences including reliability, efficiency and safety. The research results approved that the number of line switch off and conductor melted down when lighting striking on the line was decreased greatly after these over-head insulated power lines installed with these over-voltage protecting equipments. Especially, the nonlinear over-voltage protector that recommended by the paper can restrain the surge over-voltage more effectively and shut off power frequency current flash more rapidly.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133104301","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
New magnetic polymers 新型磁性聚合物
2007 Electrical Insulation Conference and Electrical Manufacturing Expo Pub Date : 2007-10-01 DOI: 10.1109/EEIC.2007.4562641
J. Masi
{"title":"New magnetic polymers","authors":"J. Masi","doi":"10.1109/EEIC.2007.4562641","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562641","url":null,"abstract":"New polymer (organic) materials have been fabricated in which there is sufficient electronic exchange as well as stability, both thermally and chemically, at room temperature and above. This paper gives an overview of the synthesis of promising new complex polymer building blocks which can yield super-paramagnetic materials for magnetic devices. The use of these methods to produce ferri-, para-, and superparamagnetic materials allows form factor, low- temperature processing, and device variations that facilitate their use in a wide variety of applications. New materials from the polysulfide, urethane, silicone, and epoxide classes of materials are explained. Some devices (and their characteristics) made from these materials are discussed.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117059656","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
Electro-coupling effect on the transient voltage distribution in PWM motor winding 电耦合对PWM电机绕组暂态电压分布的影响
2007 Electrical Insulation Conference and Electrical Manufacturing Expo Pub Date : 2007-10-01 DOI: 10.1109/EEIC.2007.4562608
A. Bohori, S. Ratadiya, N. Kumar, Rihong Mo, T. Asokan
{"title":"Electro-coupling effect on the transient voltage distribution in PWM motor winding","authors":"A. Bohori, S. Ratadiya, N. Kumar, Rihong Mo, T. Asokan","doi":"10.1109/EEIC.2007.4562608","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562608","url":null,"abstract":"Faster switching with IGBT's is known to enhance the control and efficiency of electrical machines significantly while the same is realized to induce over-voltages at the machine terminal to an extent of 3 to 4pu along with inhomogeneous voltage distribution across the stator winding, which often endanger the insulation reliability. Reliable machine design calls for accurate prediction of voltage distribution under various system variables such as inverter pulse rise time, cable and winding parameters. Significant efforts around the world have been made in the past to predict the over-voltages and volt- distribution across the winding. All the reported models display a linear voltage distribution whilst the experimental results often exhibit non-linear voltage distribution, particularly in 3-phase system. In the present paper, a 3-phase distributed model that constitutes (i) R, L and C of winding and cables, (ii) couplings associated with windings and cables and (iii) independent representation of slot and over hang portion is simulated systematically. The results obtained through the present circuit model are found to match well with the experiments. The nonlinear voltage distribution and negative hump in coil waveform is captured first time and the results are discussed in relation to coupling parameters.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"274 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128936642","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: 5
Thermal impact characteristics by forest fire on porcelain insulators for transmission lines 森林火灾对输电线路瓷绝缘子的热冲击特性
2007 Electrical Insulation Conference and Electrical Manufacturing Expo Pub Date : 2007-10-01 DOI: 10.1109/EEIC.2007.4562601
Se-Won Han, I. Choi, Dong-il Lee
{"title":"Thermal impact characteristics by forest fire on porcelain insulators for transmission lines","authors":"Se-Won Han, I. Choi, Dong-il Lee","doi":"10.1109/EEIC.2007.4562601","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562601","url":null,"abstract":"In this study the thermal impact characteristics by forest fire are extensively investigated using temperature controlled ovens. The test conditions for thermal impact damage are simulated according to the characteristics of natural forest fire. The test pieces are suspension porcelain insulators made by KRI in 2005 for transmission lines. In the thermal impact cycle tests with 300degC thermal impact gradient (-70 to 230degC), cycling in 10 minute periods, no critical failures occurred in the test samples even with long cycle times. But in tests with thermal impact gradient from room temperature to 200-600degC, cycling in 10 to 30 minute periods, there were critical failures of the porcelain insulators according to the thermal impact gradient and quenching method. In the case of thermal impact by forest fire, it was found of that duration time is more important than the cycling time, and the initiation temperature of porcelain insulator failures is about 300degC, in the case of water quenching, many cracks and fracture of the porcelain occurred. It was found that the thermal impact failure is closely related to the displacement in the cement by thermal stress as confirmed by simulation. It was estimated that the initiation displacement by the thermal impact of 300degC is about 0.1%. Above 1% displacement, it is expected that the most porcelain insulators would fail.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131245036","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
Study of UHV DC corona performance in a mini corona cage 微型电晕笼中特高压直流电晕性能的研究
2007 Electrical Insulation Conference and Electrical Manufacturing Expo Pub Date : 2007-10-01 DOI: 10.1109/EEIC.2007.4562660
Wei Wang, Chengrong Li, Jianbin Fan, Chen Gu, Yitao Jiang, Guohua Cui
{"title":"Study of UHV DC corona performance in a mini corona cage","authors":"Wei Wang, Chengrong Li, Jianbin Fan, Chen Gu, Yitao Jiang, Guohua Cui","doi":"10.1109/EEIC.2007.4562660","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562660","url":null,"abstract":"To research the effect of high altitude on corona performance of UHV DC transmission line, the corona inception voltage gradient of a copper line at different air pressure level from 101 kPa to 61 kPa was measured in a mini corona cage. The results have been compared with calculated results of Peek law and the corona inception voltage gradient correction factor of air pressure was presented.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134645905","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: 9
Exporting solid models (SM) of electrical assemblies into finite element analysis (FEA) 将电气组件的实体模型(SM)导出为有限元分析(FEA)
2007 Electrical Insulation Conference and Electrical Manufacturing Expo Pub Date : 2007-10-01 DOI: 10.1109/EEIC.2007.4562646
T. Waggoner
{"title":"Exporting solid models (SM) of electrical assemblies into finite element analysis (FEA)","authors":"T. Waggoner","doi":"10.1109/EEIC.2007.4562646","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562646","url":null,"abstract":"Designing of electrical components and assemblies has changed dramatically from CAD to SM-based designs. Following the SM electrical assembly through the FEA process is different than it was in the CAD days. The assembly must be loaded and constrained based on the SM geometry of the electrical assembly.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123123110","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
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