Pub Date : 1991-10-07DOI: 10.1109/EEIC.1991.162586
K. Bultemeier, J. E. Bodette
A method has been developed which utilizes a melt application process to manufacture a magnet wire with poly(aryletherketone) as the insulating material. The resulting magnet wire product exhibits exceptional properties in hostile environments. This developmental magnet wire product has application in areas requiring high thermal and chemical resistance.<>
{"title":"A new high temperature magnet wire with excellent chemical stability","authors":"K. Bultemeier, J. E. Bodette","doi":"10.1109/EEIC.1991.162586","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162586","url":null,"abstract":"A method has been developed which utilizes a melt application process to manufacture a magnet wire with poly(aryletherketone) as the insulating material. The resulting magnet wire product exhibits exceptional properties in hostile environments. This developmental magnet wire product has application in areas requiring high thermal and chemical resistance.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127513445","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 : 1991-10-07DOI: 10.1109/EEIC.1991.162604
K. Hodges
Describes the VersaPac system, explains some potential problems with the system as identified by actual end users, and explains one successful retrofit that solves these inherent problems as requested by customers. The potential problems solved by the retrofitted VersaPac replacement include preventing contaminant tracking between the conductor and ground, allowing easy winding reconnect, and eliminating repeated purchase of VersaPac kits and extended lead times. This particular design has been installed and incorporated into several multi-thousand-horsepower motors in a variety of applications. In all cases, there have been no adverse effects of the conversion.<>
{"title":"End turn bracing techniques","authors":"K. Hodges","doi":"10.1109/EEIC.1991.162604","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162604","url":null,"abstract":"Describes the VersaPac system, explains some potential problems with the system as identified by actual end users, and explains one successful retrofit that solves these inherent problems as requested by customers. The potential problems solved by the retrofitted VersaPac replacement include preventing contaminant tracking between the conductor and ground, allowing easy winding reconnect, and eliminating repeated purchase of VersaPac kits and extended lead times. This particular design has been installed and incorporated into several multi-thousand-horsepower motors in a variety of applications. In all cases, there have been no adverse effects of the conversion.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"394 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132019998","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 : 1991-10-07DOI: 10.1109/EEIC.1991.162594
L. Schwartz
It is suggested that changes in the electrical insulation component marketplace in the next five years will be driven by quality, reliability, environmental factors, and technology. These changes are discussed with regard to quality, wire splice sealing, gels, nonhalogen flame retardants, and new polymer systems.<>
{"title":"Future direction of electrical insulation components","authors":"L. Schwartz","doi":"10.1109/EEIC.1991.162594","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162594","url":null,"abstract":"It is suggested that changes in the electrical insulation component marketplace in the next five years will be driven by quality, reliability, environmental factors, and technology. These changes are discussed with regard to quality, wire splice sealing, gels, nonhalogen flame retardants, and new polymer systems.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124000674","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 : 1991-10-07DOI: 10.1109/EEIC.1991.162581
T. Corley
Effects of moisture exposure before cure of Scotchply 1009 composite material have been studied by three thermal analysis methods. These studies revealed the need for state-of-the-art analytical tools as well as increased attention to detail in packaging (by supplier) and improved handling (by user to reduce moisture exposure). It is shown that water definitely has a detrimental effect on the cure of Scotchply 1009 prepreg containing a boron trifluoride monoethylamine curing agent. Exposure to moisture greater than 70% RH (relative humidity) can be detrimental and lower the T/sub g/ of Scotchply 1009. Cure temperature high enough to ensure sufficiently high T/sub g/ in 1009 material which has been exposed to moisture can result in degradation of the thermosetting resin. In the manufacture of stator coils, this could cause degradation of electrical properties.<>
{"title":"Effect of moisture exposure before curing in epoxy-glass B-stage composites","authors":"T. Corley","doi":"10.1109/EEIC.1991.162581","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162581","url":null,"abstract":"Effects of moisture exposure before cure of Scotchply 1009 composite material have been studied by three thermal analysis methods. These studies revealed the need for state-of-the-art analytical tools as well as increased attention to detail in packaging (by supplier) and improved handling (by user to reduce moisture exposure). It is shown that water definitely has a detrimental effect on the cure of Scotchply 1009 prepreg containing a boron trifluoride monoethylamine curing agent. Exposure to moisture greater than 70% RH (relative humidity) can be detrimental and lower the T/sub g/ of Scotchply 1009. Cure temperature high enough to ensure sufficiently high T/sub g/ in 1009 material which has been exposed to moisture can result in degradation of the thermosetting resin. In the manufacture of stator coils, this could cause degradation of electrical properties.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129400043","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 : 1991-10-07DOI: 10.1109/EEIC.1991.162585
Y. Shibata, H. Tatsumi, M. Suzuki, H. Doshita, Y. Nagahira
The authors report the characteristics of dual-coat magnet wires with heat-resistant, self-lubricating (SL) overcoat and the results of their application to the actual production of electric motors. The newly developed heat-resistant lubricating varnish enables production of magnet wires with improved lubricating properties and thermal and mechanical strength in combination with an insulating film such as polyester, modified polyester, polyamideimide, etc. as undercoat material. It was found that improvement of lubricating property was an effective measure to ease mechanical stress during manufacturing. A possibility of reducing film thickness due to the improvement was suggested. and confirmed by a breakdown test using coils wound into actual motors. The class F and class H SL magnet wires have successfully been used for stator coils of general-purpose medium size motors and for servomotors, respectively. They helped make these motors better, lighter, and more efficient. with expanded use of automated manufacturing.<>
{"title":"Development of new self-lubricating magnet wires and their application to production of medium size motors","authors":"Y. Shibata, H. Tatsumi, M. Suzuki, H. Doshita, Y. Nagahira","doi":"10.1109/EEIC.1991.162585","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162585","url":null,"abstract":"The authors report the characteristics of dual-coat magnet wires with heat-resistant, self-lubricating (SL) overcoat and the results of their application to the actual production of electric motors. The newly developed heat-resistant lubricating varnish enables production of magnet wires with improved lubricating properties and thermal and mechanical strength in combination with an insulating film such as polyester, modified polyester, polyamideimide, etc. as undercoat material. It was found that improvement of lubricating property was an effective measure to ease mechanical stress during manufacturing. A possibility of reducing film thickness due to the improvement was suggested. and confirmed by a breakdown test using coils wound into actual motors. The class F and class H SL magnet wires have successfully been used for stator coils of general-purpose medium size motors and for servomotors, respectively. They helped make these motors better, lighter, and more efficient. with expanded use of automated manufacturing.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128493787","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 : 1991-10-07DOI: 10.1109/EEIC.1991.162610
M. Danikas
Voids have a deleterious effect on the performance of solid insulation because of partial discharges taking place at relatively low stresses. The waveshape of partial discharge current is studied for voids of various depths in polyethylene. Some examples of the measurements performed are shown and discussed. The voltages appearing across the voids under investigation are compared with Paschen's curve. It is suggested that the discharge mechanism in an enclosed void is a streamer mechanism. There is also evidence that part of the void discharges, not the whole of it.<>
{"title":"Some further comments on the fast measurements of partial discharges in polyethylene voids","authors":"M. Danikas","doi":"10.1109/EEIC.1991.162610","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162610","url":null,"abstract":"Voids have a deleterious effect on the performance of solid insulation because of partial discharges taking place at relatively low stresses. The waveshape of partial discharge current is studied for voids of various depths in polyethylene. Some examples of the measurements performed are shown and discussed. The voltages appearing across the voids under investigation are compared with Paschen's curve. It is suggested that the discharge mechanism in an enclosed void is a streamer mechanism. There is also evidence that part of the void discharges, not the whole of it.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129608744","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 : 1991-10-07DOI: 10.1109/EEIC.1991.162569
C. Pinto
The preferred method of detecting contamination of stator winding insulation is to measure its DC resistance (IR) and polarization index (PI). However, a number of cases have been reported where good IR and PI values have been obtained despite the windings being considerably contaminated. While attempting to compute variations of the polarizing currents in the frequency domain, the author has made of the results obtained in conjunction with low-voltage AC measurements at the supply frequency to detect contaminations of the two windings. A method has been suggested that could help detect contamination in cases of the above-mentioned good IR and PI values by estimating tan delta and capacitance variations with frequency from the charging current curve and comparing the same with measured tan delta values.<>
{"title":"An improved method of detecting contamination of HV stator windings in the field","authors":"C. Pinto","doi":"10.1109/EEIC.1991.162569","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162569","url":null,"abstract":"The preferred method of detecting contamination of stator winding insulation is to measure its DC resistance (IR) and polarization index (PI). However, a number of cases have been reported where good IR and PI values have been obtained despite the windings being considerably contaminated. While attempting to compute variations of the polarizing currents in the frequency domain, the author has made of the results obtained in conjunction with low-voltage AC measurements at the supply frequency to detect contaminations of the two windings. A method has been suggested that could help detect contamination in cases of the above-mentioned good IR and PI values by estimating tan delta and capacitance variations with frequency from the charging current curve and comparing the same with measured tan delta values.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130441875","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 : 1991-10-07DOI: 10.1109/EEIC.1991.162607
B. Lloyd, G. Stone
The authors describe expert systems in general, and their advantages over conventional software in assisting with the operation and maintenance of large electrical equipment such as switchgear, motors, and generators. Criteria for selecting suitable applications for an expert system are discussed, and knowledge representation in an expert system is considered. Practical examples of expert system technology in the power engineering field are reviewed.<>
{"title":"Prospects for expert systems to aid the operation and maintenance of electrical equipment","authors":"B. Lloyd, G. Stone","doi":"10.1109/EEIC.1991.162607","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162607","url":null,"abstract":"The authors describe expert systems in general, and their advantages over conventional software in assisting with the operation and maintenance of large electrical equipment such as switchgear, motors, and generators. Criteria for selecting suitable applications for an expert system are discussed, and knowledge representation in an expert system is considered. Practical examples of expert system technology in the power engineering field are reviewed.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"24 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132609319","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 : 1991-10-07DOI: 10.1109/EEIC.1991.162587
M. Brown, D. White, T. Jafri
The authors describe their initial work at establishing a matrix of magnet wire insulation behavior in various fluid environments. They consider test conditions and test methods employed as well as the exposure temperature and the degree of insulation cure. Discussion of results and future work is presented.<>
{"title":"Compatibility of magnet wire insulations with various fluid environments","authors":"M. Brown, D. White, T. Jafri","doi":"10.1109/EEIC.1991.162587","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162587","url":null,"abstract":"The authors describe their initial work at establishing a matrix of magnet wire insulation behavior in various fluid environments. They consider test conditions and test methods employed as well as the exposure temperature and the degree of insulation cure. Discussion of results and future work is presented.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132740249","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 : 1991-10-07DOI: 10.1109/EEIC.1991.162596
James F. B. Patterson
Novel methods of encapsulating coils using thermoplastics speed manufacturing and allow for multifunctional designs that eliminate parts and simplify assembly. The author reviews and reports on recent developments in materials, processing techniques, and applications in this area. With regard to applications. two new fields for thermoplastic encapsulation have opened up: automotive sensors and motor stators. Also, more and more solenoids and transformers are being encapsulated with thermoplastics. As for materials, nylon 6/12 and toughened PET extend the range of part design and processing possibilities. They are good complements to nylon 6,6 and standard grades of thermoplastic polyesters. Ongoing research and development in processing have expanded the knowledge of tooling designs and molding parameters that optimize product quality, extend the design horizon, and reduce the time and cost of developing new applications.<>
{"title":"Advances in thermoplastic coil encapsulation","authors":"James F. B. Patterson","doi":"10.1109/EEIC.1991.162596","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162596","url":null,"abstract":"Novel methods of encapsulating coils using thermoplastics speed manufacturing and allow for multifunctional designs that eliminate parts and simplify assembly. The author reviews and reports on recent developments in materials, processing techniques, and applications in this area. With regard to applications. two new fields for thermoplastic encapsulation have opened up: automotive sensors and motor stators. Also, more and more solenoids and transformers are being encapsulated with thermoplastics. As for materials, nylon 6/12 and toughened PET extend the range of part design and processing possibilities. They are good complements to nylon 6,6 and standard grades of thermoplastic polyesters. Ongoing research and development in processing have expanded the knowledge of tooling designs and molding parameters that optimize product quality, extend the design horizon, and reduce the time and cost of developing new applications.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"6 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114000699","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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