Pub Date : 1985-09-01DOI: 10.1109/EIC.1985.7458573
Robert Jones
The development of a workable, up-to-date standard requires continuous work and effort by usually a small group of dedicated, knowledgeable people working together. For magnet wire, the end result is the NEMA MW1000 document which has been constantly upgraded to reflect the latest developments and trends in magnet wire products, test procedures, and ideas on how a wire should be tested to provide the end user with the desired properties. Since the last report was given at the E/EIC meeting in Chicago in 1983, a number of significant changes have been made.
{"title":"Chairman's report NEMA magnet wire Technical Committee activities","authors":"Robert Jones","doi":"10.1109/EIC.1985.7458573","DOIUrl":"https://doi.org/10.1109/EIC.1985.7458573","url":null,"abstract":"The development of a workable, up-to-date standard requires continuous work and effort by usually a small group of dedicated, knowledgeable people working together. For magnet wire, the end result is the NEMA MW1000 document which has been constantly upgraded to reflect the latest developments and trends in magnet wire products, test procedures, and ideas on how a wire should be tested to provide the end user with the desired properties. Since the last report was given at the E/EIC meeting in Chicago in 1983, a number of significant changes have been made.","PeriodicalId":188957,"journal":{"name":"1985 EIC 17th Electrical/Electronics Insulation Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116967555","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 : 1985-09-01DOI: 10.1109/EIC.1985.7458570
Donald P. McCredie, J. Watson
With the current trend away from fully cured insulation materials to uncured low binder mica tapes, a need to develop adequate proof testing methods during taping and stator winding has become increasingly evident. The motor/generator manufacturer or repair facility wants to test at as high a voltage as possible to detect faults but without risk of creating damage to the insulation. Too many end users of mica ground wall insulation continue to proof test using methods adaptable to material construction prior to the introduction of VPI processing. Since then (circa 1960) mica tape has been engineered by several manufacturers specifically for VPI. Several changes have been introduced to optimize resin impregnation and retention post cure. Lower dielectric breakdown values are initially obtained in the “green” or unprocessed state precure. Post cure the breakdown minimum frequently exceed 10 X rated voltage DC. It is necessary to proof test in the uncured state at lower values. This paper will report reasons for this necessity. Also included will be possible alternatives. Work will be continued to establish a maximum safe limit for uncured short term voltage withstand.
{"title":"Short term voltage withstand for testing of uncured high voltage form wound coil insulation","authors":"Donald P. McCredie, J. Watson","doi":"10.1109/EIC.1985.7458570","DOIUrl":"https://doi.org/10.1109/EIC.1985.7458570","url":null,"abstract":"With the current trend away from fully cured insulation materials to uncured low binder mica tapes, a need to develop adequate proof testing methods during taping and stator winding has become increasingly evident. The motor/generator manufacturer or repair facility wants to test at as high a voltage as possible to detect faults but without risk of creating damage to the insulation. Too many end users of mica ground wall insulation continue to proof test using methods adaptable to material construction prior to the introduction of VPI processing. Since then (circa 1960) mica tape has been engineered by several manufacturers specifically for VPI. Several changes have been introduced to optimize resin impregnation and retention post cure. Lower dielectric breakdown values are initially obtained in the “green” or unprocessed state precure. Post cure the breakdown minimum frequently exceed 10 X rated voltage DC. It is necessary to proof test in the uncured state at lower values. This paper will report reasons for this necessity. Also included will be possible alternatives. Work will be continued to establish a maximum safe limit for uncured short term voltage withstand.","PeriodicalId":188957,"journal":{"name":"1985 EIC 17th Electrical/Electronics Insulation Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122790052","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 : 1985-09-01DOI: 10.1109/EIC.1985.7458629
J. Smith
Reliable generation requires the early identification of defects occurring in service. This is best achieved through a planned programme of regular diagnostic testing and is particularly relevant to the electrical insulation of generators and large A.C. motors. The paper describes some recent advances in diagnostic techniques now being applied to monitor the in-service condition of stator and rotor windings of generators and large A.C. motors in service in the North Western Region of the Central Electricity Generating Board.
{"title":"Some advances in electrical diagnostic testing of generators and large A.C. motors","authors":"J. Smith","doi":"10.1109/EIC.1985.7458629","DOIUrl":"https://doi.org/10.1109/EIC.1985.7458629","url":null,"abstract":"Reliable generation requires the early identification of defects occurring in service. This is best achieved through a planned programme of regular diagnostic testing and is particularly relevant to the electrical insulation of generators and large A.C. motors. The paper describes some recent advances in diagnostic techniques now being applied to monitor the in-service condition of stator and rotor windings of generators and large A.C. motors in service in the North Western Region of the Central Electricity Generating Board.","PeriodicalId":188957,"journal":{"name":"1985 EIC 17th Electrical/Electronics Insulation Conference","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129801825","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 : 1985-09-01DOI: 10.1109/EIC.1985.7458619
Ronald N. Nelsen
This paper discusses the results of a series of steel decarburization studies that were performed in a nitrogen/hydrogen atmosphere with carefully controlled humidity levels. The results show that both hydrogen and moisture levels are important in achieving good decarburization in relatively short time periods.
{"title":"The effects of atmosphere on decarburizing of magnetic steels","authors":"Ronald N. Nelsen","doi":"10.1109/EIC.1985.7458619","DOIUrl":"https://doi.org/10.1109/EIC.1985.7458619","url":null,"abstract":"This paper discusses the results of a series of steel decarburization studies that were performed in a nitrogen/hydrogen atmosphere with carefully controlled humidity levels. The results show that both hydrogen and moisture levels are important in achieving good decarburization in relatively short time periods.","PeriodicalId":188957,"journal":{"name":"1985 EIC 17th Electrical/Electronics Insulation Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116284144","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 : 1985-09-01DOI: 10.1109/EIC.1985.7458641
L. A. Mckenna
To understand why there has been such a recent flurry of activity on the part of resin suppliers, why there have been so many new products introduced, one needs only to examine what's happening in the electronic industry—particularly in the area of interconnects. The list of emerging new technologies that are rapidly changing the essence of this industry includes entries such as surface mount technology, fiber optics, very high speed integrated circuits, automatic insertion, and high density interconnects (with as many as 684 pins). These new advances bring with them new demands such as resistance to 419°F vapors, thin wall moldability, more accurate hole registration, and flatness over lengths as long as 18 inches. It is in response to these demands that we in the plastics industry are developing and introducing so many new products.
{"title":"Mindel® B resins - new options in thermoset replacement in electrical/electronic devices","authors":"L. A. Mckenna","doi":"10.1109/EIC.1985.7458641","DOIUrl":"https://doi.org/10.1109/EIC.1985.7458641","url":null,"abstract":"To understand why there has been such a recent flurry of activity on the part of resin suppliers, why there have been so many new products introduced, one needs only to examine what's happening in the electronic industry—particularly in the area of interconnects. The list of emerging new technologies that are rapidly changing the essence of this industry includes entries such as surface mount technology, fiber optics, very high speed integrated circuits, automatic insertion, and high density interconnects (with as many as 684 pins). These new advances bring with them new demands such as resistance to 419°F vapors, thin wall moldability, more accurate hole registration, and flatness over lengths as long as 18 inches. It is in response to these demands that we in the plastics industry are developing and introducing so many new products.","PeriodicalId":188957,"journal":{"name":"1985 EIC 17th Electrical/Electronics Insulation Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128148827","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 : 1985-09-01DOI: 10.1109/EIC.1985.7458578
J. Groeger, Eva Rand
Routine microscopic examination of EPR insulated cables and cable accessories has been hampered by a lack of adequate sample preparation methods and established microscopic inspection techniques. During the course of our analyses of failures in EPR insulated cables and accessories, we have developed routine methods for the preparation of continuous ribbons or “slinkies” of EPR insulation as thin as 2 mils. Methods for the examination of these materials in transmitted illumination with the polarizing microscope have been developed. Techniques for the identification of contaminants and filler agglomerates with the Scanning Electron Microscope and X-ray Emission Spectroscopy have also been perfected. The measurement of void and filler particle size distributions in EPR insulation has been facilitated through the use of computerized image analysis. Development of macroscopic observation techniques to allow the inspection of insulation for homogeneity of filler distribution has been completed. In addition, these novel techniques allow for the inspection of the insulation/shield interfaces for protrusions, voids, and contaminants. Preliminary techniques have been devised for staining of water and electrical trees within EPR insulation.
{"title":"Microscopy techniques for the analysis of EPR cable insulation","authors":"J. Groeger, Eva Rand","doi":"10.1109/EIC.1985.7458578","DOIUrl":"https://doi.org/10.1109/EIC.1985.7458578","url":null,"abstract":"Routine microscopic examination of EPR insulated cables and cable accessories has been hampered by a lack of adequate sample preparation methods and established microscopic inspection techniques. During the course of our analyses of failures in EPR insulated cables and accessories, we have developed routine methods for the preparation of continuous ribbons or “slinkies” of EPR insulation as thin as 2 mils. Methods for the examination of these materials in transmitted illumination with the polarizing microscope have been developed. Techniques for the identification of contaminants and filler agglomerates with the Scanning Electron Microscope and X-ray Emission Spectroscopy have also been perfected. The measurement of void and filler particle size distributions in EPR insulation has been facilitated through the use of computerized image analysis. Development of macroscopic observation techniques to allow the inspection of insulation for homogeneity of filler distribution has been completed. In addition, these novel techniques allow for the inspection of the insulation/shield interfaces for protrusions, voids, and contaminants. Preliminary techniques have been devised for staining of water and electrical trees within EPR insulation.","PeriodicalId":188957,"journal":{"name":"1985 EIC 17th Electrical/Electronics Insulation Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130818866","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 : 1985-09-01DOI: 10.1109/EIC.1985.7458609
K. Ito, K. Ueda, K. Nakano, K. Hanaoka, S. Chabata
Fujikura has carried out to shorten the bonding time of SBWS thermosetting system by using current heating method for hermetic motor processing than external curing by oven that is widely now used. This report relates to heating methods and their properties in hermetic motor insulation. From the results, Fujikura gets a conclusion that the bonding and curing rate of current heating system is approximately 30 times as same as that of conventional external heating system without decreasing the reliability as bondable insulation system for hermetic use.
{"title":"Electricity current heating and bondable insulation system for hermetic motor","authors":"K. Ito, K. Ueda, K. Nakano, K. Hanaoka, S. Chabata","doi":"10.1109/EIC.1985.7458609","DOIUrl":"https://doi.org/10.1109/EIC.1985.7458609","url":null,"abstract":"Fujikura has carried out to shorten the bonding time of SBWS thermosetting system by using current heating method for hermetic motor processing than external curing by oven that is widely now used. This report relates to heating methods and their properties in hermetic motor insulation. From the results, Fujikura gets a conclusion that the bonding and curing rate of current heating system is approximately 30 times as same as that of conventional external heating system without decreasing the reliability as bondable insulation system for hermetic use.","PeriodicalId":188957,"journal":{"name":"1985 EIC 17th Electrical/Electronics Insulation Conference","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127321368","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 : 1985-09-01DOI: 10.1109/EIC.1985.7458581
A. El-sulaiman
It is evident from experimental studies that the anode-liquid interface played an important role on conduction current vis time and field as well as breakdown probabily. The influence was shown on i-E characteristics which modify Nikuradse' ideal characteristic. The experimental data deals with insulating film, space charge, and charge carrier formed due to anode-liquid interface under influence of high DC non-uniform field. Analysis of the nature of this insulating film and space charge reaction will be presented.
{"title":"Study of anode-liquid interface in transformer oil under high DC non uniform field","authors":"A. El-sulaiman","doi":"10.1109/EIC.1985.7458581","DOIUrl":"https://doi.org/10.1109/EIC.1985.7458581","url":null,"abstract":"It is evident from experimental studies that the anode-liquid interface played an important role on conduction current vis time and field as well as breakdown probabily. The influence was shown on i-E characteristics which modify Nikuradse' ideal characteristic. The experimental data deals with insulating film, space charge, and charge carrier formed due to anode-liquid interface under influence of high DC non-uniform field. Analysis of the nature of this insulating film and space charge reaction will be presented.","PeriodicalId":188957,"journal":{"name":"1985 EIC 17th Electrical/Electronics Insulation Conference","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115200457","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 : 1985-09-01DOI: 10.1109/EIC.1985.7458635
Louis M. Renn
Continuous improvements in quality and productivity are necessary to remain competitive in the magnet wire industry. The quality standards for suppliers of magnet wire have steadily increased as customers recognize that quality products must begin with quality raw materials. To achieve this end, AnaMag uses Statistical Process Control (S.P.C.) to identify, analyze, and control the variations in the process that affect quality. With the use of statistical methods, we are better able to provide products that meet our customers expectations. S.P.C. as a tool to prevent defects, has the additional benefit of lowering the cost of quality by reducing the amount of sorting, rework and scrap of non-conforming magnet wire.
{"title":"Implementation of Statistical Process Controls in the manufacture of magnet wire","authors":"Louis M. Renn","doi":"10.1109/EIC.1985.7458635","DOIUrl":"https://doi.org/10.1109/EIC.1985.7458635","url":null,"abstract":"Continuous improvements in quality and productivity are necessary to remain competitive in the magnet wire industry. The quality standards for suppliers of magnet wire have steadily increased as customers recognize that quality products must begin with quality raw materials. To achieve this end, AnaMag uses Statistical Process Control (S.P.C.) to identify, analyze, and control the variations in the process that affect quality. With the use of statistical methods, we are better able to provide products that meet our customers expectations. S.P.C. as a tool to prevent defects, has the additional benefit of lowering the cost of quality by reducing the amount of sorting, rework and scrap of non-conforming magnet wire.","PeriodicalId":188957,"journal":{"name":"1985 EIC 17th Electrical/Electronics Insulation Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115357120","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 : 1985-09-01DOI: 10.1109/EIC.1985.7458603
D. Singh, A. K. Govila, V.K. Ganpate
Polyester resins and their composite have been evaluated by using two of the thermoanalytical methods viz. Differential Scanning Calorimetry (DSC) and Thermo gravimetry (TG). With the help of DSC, data on state of “B” stage cure, optimum curing temperature was obtained for a polyester resin and Dough Moulding compounds obtained from two different source. These results helped to optimise process parameters. Thermogravimetry has been used to determine heat resistance of polyester resins and DMC composites. Energy oh activation for degradation process has also been calculated which resembles closely with theoretical values. In this Paper, the methodology of experimentation and the results obtained have been discussed which elucidate the importance of using thermo analytical methods for quick and reliable results.
{"title":"Characterisation of polyester resins and composites by differential scanning calorimetry (DSC) and thermogravimetry (TG)","authors":"D. Singh, A. K. Govila, V.K. Ganpate","doi":"10.1109/EIC.1985.7458603","DOIUrl":"https://doi.org/10.1109/EIC.1985.7458603","url":null,"abstract":"Polyester resins and their composite have been evaluated by using two of the thermoanalytical methods viz. Differential Scanning Calorimetry (DSC) and Thermo gravimetry (TG). With the help of DSC, data on state of “B” stage cure, optimum curing temperature was obtained for a polyester resin and Dough Moulding compounds obtained from two different source. These results helped to optimise process parameters. Thermogravimetry has been used to determine heat resistance of polyester resins and DMC composites. Energy oh activation for degradation process has also been calculated which resembles closely with theoretical values. In this Paper, the methodology of experimentation and the results obtained have been discussed which elucidate the importance of using thermo analytical methods for quick and reliable results.","PeriodicalId":188957,"journal":{"name":"1985 EIC 17th Electrical/Electronics Insulation Conference","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115929914","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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