Pub Date : 1999-10-26DOI: 10.1109/EEIC.1999.826292
M. Perkins, L. Pettersson, N.L. Fantana, T. Oommen, S. Jordan
This paper discusses the general tools available for transformer life assessment and describes specific applications to nuclear station generator transformers that are of strategic importance. The most meaningful life assessment should be aimed at ranking groups of units on the basis of key performance parameters using weight factors.
{"title":"Transformer life assessment tools with specific application to nuclear power station generator transformers","authors":"M. Perkins, L. Pettersson, N.L. Fantana, T. Oommen, S. Jordan","doi":"10.1109/EEIC.1999.826292","DOIUrl":"https://doi.org/10.1109/EEIC.1999.826292","url":null,"abstract":"This paper discusses the general tools available for transformer life assessment and describes specific applications to nuclear station generator transformers that are of strategic importance. The most meaningful life assessment should be aimed at ranking groups of units on the basis of key performance parameters using weight factors.","PeriodicalId":415071,"journal":{"name":"Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127128262","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}
Pub Date : 1999-10-26DOI: 10.1109/EEIC.1999.826287
R. Kurz
This paper discusses a technique for retarding moisture absorption by pressboard cylinders, used as winding tubes for transformer coils. The PARA-SEAL process involves treating the pressboard cylinders with paraffin wax. Since moisture absorption is markedly reduced, the cylinders do not grow and, therefore, maintain their as manufactured dimensions. The cylinders can then be used to wind transformer coils as received without redrying. This saves both process time and the associated costs since the cylinders can go directly to the coil winding machine from the receiving floor (outside vendor) or tube manufacturing section (in-house production). This benefit is especially favored with the 'just in time' concept of manufacture.
{"title":"Method to retard moisture absorption in pressboard structures","authors":"R. Kurz","doi":"10.1109/EEIC.1999.826287","DOIUrl":"https://doi.org/10.1109/EEIC.1999.826287","url":null,"abstract":"This paper discusses a technique for retarding moisture absorption by pressboard cylinders, used as winding tubes for transformer coils. The PARA-SEAL process involves treating the pressboard cylinders with paraffin wax. Since moisture absorption is markedly reduced, the cylinders do not grow and, therefore, maintain their as manufactured dimensions. The cylinders can then be used to wind transformer coils as received without redrying. This saves both process time and the associated costs since the cylinders can go directly to the coil winding machine from the receiving floor (outside vendor) or tube manufacturing section (in-house production). This benefit is especially favored with the 'just in time' concept of manufacture.","PeriodicalId":415071,"journal":{"name":"Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131552261","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}
Pub Date : 1999-10-26DOI: 10.1109/EEIC.1999.826264
A.A. Paithankar, A. Mokashi, N.M. Singh
The dynamic evolution of partial discharges (PDs) is nonlinear and chaotic in nature. This means that although a PD has a definite governing principle which dictates its evolution, it may behave in an apparently random manner due the existence of nonlinearity. Analyzing the PD process entails considering a PD as a dynamical system. As the PD process evolves, it marks a trajectory in the state-space which is attracted to a specific region. This region of the the state-space is called the attractor. Distinct PD defects have distinct dynamics of evolution which result in a unique structure for PD attractors. In this paper, two methods of characterizing PD attractors are discussed. The first method relates to the statistical or the metric characterization of the PD attractor which attempts to describe the structure of the attractor in metric terms. The topological characterization aims at evaluating the topological invariants of the system, which describe the geometry of the attractor.
{"title":"Statistical and topological characterization of PD defects","authors":"A.A. Paithankar, A. Mokashi, N.M. Singh","doi":"10.1109/EEIC.1999.826264","DOIUrl":"https://doi.org/10.1109/EEIC.1999.826264","url":null,"abstract":"The dynamic evolution of partial discharges (PDs) is nonlinear and chaotic in nature. This means that although a PD has a definite governing principle which dictates its evolution, it may behave in an apparently random manner due the existence of nonlinearity. Analyzing the PD process entails considering a PD as a dynamical system. As the PD process evolves, it marks a trajectory in the state-space which is attracted to a specific region. This region of the the state-space is called the attractor. Distinct PD defects have distinct dynamics of evolution which result in a unique structure for PD attractors. In this paper, two methods of characterizing PD attractors are discussed. The first method relates to the statistical or the metric characterization of the PD attractor which attempts to describe the structure of the attractor in metric terms. The topological characterization aims at evaluating the topological invariants of the system, which describe the geometry of the attractor.","PeriodicalId":415071,"journal":{"name":"Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129529863","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}
Pub Date : 1999-10-26DOI: 10.1109/EEIC.1999.826211
T. Weiss
This paper discusses the development of a second generation of the "heatless chemical cure process" used in the manufacture of domestic appliance motor windings. The advantages of the process as compared with conventional processes are documented.
{"title":"Heatless resin coatings for appliance motor windings","authors":"T. Weiss","doi":"10.1109/EEIC.1999.826211","DOIUrl":"https://doi.org/10.1109/EEIC.1999.826211","url":null,"abstract":"This paper discusses the development of a second generation of the \"heatless chemical cure process\" used in the manufacture of domestic appliance motor windings. The advantages of the process as compared with conventional processes are documented.","PeriodicalId":415071,"journal":{"name":"Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123652286","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}
Pub Date : 1999-10-26DOI: 10.1109/EEIC.1999.826198
N. Swain
The chairman's report describes all activities undertaken by the NEMA Magnet Wire Committee since the 1997 EIC Conference. The report covers changes made to the NEMA MW 1000-1997 standard for magnet wire, as well as describing work that has validated current test procedures and requirements. Details of work currently underway, including activities such as those to make the standard more readily available and to harmonize with other standards are also provided.
{"title":"NEMA Magnet Wire Technical Committee chairman's report","authors":"N. Swain","doi":"10.1109/EEIC.1999.826198","DOIUrl":"https://doi.org/10.1109/EEIC.1999.826198","url":null,"abstract":"The chairman's report describes all activities undertaken by the NEMA Magnet Wire Committee since the 1997 EIC Conference. The report covers changes made to the NEMA MW 1000-1997 standard for magnet wire, as well as describing work that has validated current test procedures and requirements. Details of work currently underway, including activities such as those to make the standard more readily available and to harmonize with other standards are also provided.","PeriodicalId":415071,"journal":{"name":"Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124617993","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}
Pub Date : 1999-10-26DOI: 10.1109/EEIC.1999.826204
T. Tsurimoto, K. Itoh, Y. Kaneda, A. Sumida, S. Kuroki, T. Ohsawa, H. Tanaka
A new partial discharge (PD) monitor has been developed. It continuously monitors the electrical condition of stator winding insulation of turbine generators in service. Various turbine generators, such as those having large PD activity and load dependent PD, were measured.
{"title":"Development of partial discharge monitor for turbine generators","authors":"T. Tsurimoto, K. Itoh, Y. Kaneda, A. Sumida, S. Kuroki, T. Ohsawa, H. Tanaka","doi":"10.1109/EEIC.1999.826204","DOIUrl":"https://doi.org/10.1109/EEIC.1999.826204","url":null,"abstract":"A new partial discharge (PD) monitor has been developed. It continuously monitors the electrical condition of stator winding insulation of turbine generators in service. Various turbine generators, such as those having large PD activity and load dependent PD, were measured.","PeriodicalId":415071,"journal":{"name":"Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122553359","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}
Pub Date : 1999-10-26DOI: 10.1109/EEIC.1999.826296
M.A. Swihart
This review of planar ferrites discusses issues relevant to the magnetics designer. These include standard sizes and shapes; conductor types; material selection; power handling; gapping; assembly; design hazards; prototypes development; core manufacturing; and special applications.
{"title":"Designing with planar ferrite cores","authors":"M.A. Swihart","doi":"10.1109/EEIC.1999.826296","DOIUrl":"https://doi.org/10.1109/EEIC.1999.826296","url":null,"abstract":"This review of planar ferrites discusses issues relevant to the magnetics designer. These include standard sizes and shapes; conductor types; material selection; power handling; gapping; assembly; design hazards; prototypes development; core manufacturing; and special applications.","PeriodicalId":415071,"journal":{"name":"Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127868973","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}
Pub Date : 1999-10-26DOI: 10.1109/EEIC.1999.826263
M. Hoof, R. Patsch, Bernd Freisleben
A new neural network classifier is presented that was designed to optimize the recognition of partial discharge patterns. PD patterns resulting from various model defects are used to investigate the performance of the classifier. The classification results are compared with results obtained by a neural backpropagation network. It is shown that the classification performance can be improved when applying a suitable PD parameter, different from those commonly used. The results indicate that the new tool presented here is able to overcome typical problems inherent in most neural network based PD pattern classification approaches.
{"title":"GNC-network: a new tool for partial discharge pattern classification","authors":"M. Hoof, R. Patsch, Bernd Freisleben","doi":"10.1109/EEIC.1999.826263","DOIUrl":"https://doi.org/10.1109/EEIC.1999.826263","url":null,"abstract":"A new neural network classifier is presented that was designed to optimize the recognition of partial discharge patterns. PD patterns resulting from various model defects are used to investigate the performance of the classifier. The classification results are compared with results obtained by a neural backpropagation network. It is shown that the classification performance can be improved when applying a suitable PD parameter, different from those commonly used. The results indicate that the new tool presented here is able to overcome typical problems inherent in most neural network based PD pattern classification approaches.","PeriodicalId":415071,"journal":{"name":"Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124859060","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}
Pub Date : 1999-10-26DOI: 10.1109/EEIC.1999.826195
R. J. Beeckman
Inverter driven motors save energy and provide versatility to manufacturing and other processes. Drives allow relatively lower cost motors to run at variable speeds, but the higher voltage spikes generated by some drives have been linked to premature failure of otherwise reliable motors. Failure analyses of some of these motors have shown evidence of partial discharge damage. Motor manufacturers have scrutinized their manufacturing processes and materials to develop motors that are much more resistant to this type of failure mechanism. Magnet wire companies have developed products that are much more resistant to partial discharges, but some motors are still failing due to the continual bombardment of high voltage spikes generated by the switching devices in the drives. Much more data has been generated on corona inception and extinguish voltages in an effort to better understand the problem. This paper attempts to qualify and quantify some of the issues related to premature failure of motors running on IGBT drives. Benefits of using some different types of magnet wire insulation are explained. Specific data related to CIV vs. magnet wire insulation build are presented.
{"title":"Inverter drive issues and magnet wire responses","authors":"R. J. Beeckman","doi":"10.1109/EEIC.1999.826195","DOIUrl":"https://doi.org/10.1109/EEIC.1999.826195","url":null,"abstract":"Inverter driven motors save energy and provide versatility to manufacturing and other processes. Drives allow relatively lower cost motors to run at variable speeds, but the higher voltage spikes generated by some drives have been linked to premature failure of otherwise reliable motors. Failure analyses of some of these motors have shown evidence of partial discharge damage. Motor manufacturers have scrutinized their manufacturing processes and materials to develop motors that are much more resistant to this type of failure mechanism. Magnet wire companies have developed products that are much more resistant to partial discharges, but some motors are still failing due to the continual bombardment of high voltage spikes generated by the switching devices in the drives. Much more data has been generated on corona inception and extinguish voltages in an effort to better understand the problem. This paper attempts to qualify and quantify some of the issues related to premature failure of motors running on IGBT drives. Benefits of using some different types of magnet wire insulation are explained. Specific data related to CIV vs. magnet wire insulation build are presented.","PeriodicalId":415071,"journal":{"name":"Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131627937","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}
Pub Date : 1999-10-26DOI: 10.1109/EEIC.1999.826266
K. T. Lim, H. El-Mounayri
This paper focuses on a geometric modeling simulation using a commercially available CAD/CAM system for a virtual manufacturing environment. This CAD/CAM integrated geometric modeler for milling process simulation can operate as an off-line simulator and its offers accurate and practical solutions to the preprocess scheduling of the cutting conditions. This system can be used for machining process simulation, verification and optimization of NC codes in a virtual manufacturing environment. Finally, optimized cutting parameters can be generated to the actual machining process, thus improving on the accuracy, efficiency, and productivity in the manufacturing industry.
{"title":"CAD/CAM-based geometric modeling simulation for virtual manufacturing","authors":"K. T. Lim, H. El-Mounayri","doi":"10.1109/EEIC.1999.826266","DOIUrl":"https://doi.org/10.1109/EEIC.1999.826266","url":null,"abstract":"This paper focuses on a geometric modeling simulation using a commercially available CAD/CAM system for a virtual manufacturing environment. This CAD/CAM integrated geometric modeler for milling process simulation can operate as an off-line simulator and its offers accurate and practical solutions to the preprocess scheduling of the cutting conditions. This system can be used for machining process simulation, verification and optimization of NC codes in a virtual manufacturing environment. Finally, optimized cutting parameters can be generated to the actual machining process, thus improving on the accuracy, efficiency, and productivity in the manufacturing industry.","PeriodicalId":415071,"journal":{"name":"Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130282612","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}
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