Pub Date : 1900-01-01DOI: 10.1109/EEIC.2005.1566247
S. J. Wentz
During the past year there has been a considerable amount of activity aimed at revising the NEMA MW 1000 solderability standards to make them more consistent across the full size range of all magnet wire products. At the same time efforts continue toward harmonization with the IEC winding wire solderability standards. The final result will establish more meaningful and consistent solderability requirements in NEMA MW 1000. The current NEMA magnet wire solderability standards and our efforts to harmonize with International Electrotechnical Commission (IEC) winding wire solderability standards are briefly reviewed with special emphasis on those solderability changes introduced into NEMA MW 1000. Specifically, changes that will be discussed include modifications to NEMA solderability temperatures and the maximum time allowed for proper soldering at these temperatures. The paper then reviews the results of an industry wide solderability study of various magnet wire products in the 10-52 AWG size range to the proposed new requirements for single, heavy, and triple builds. The solderability changes discussed in this paper will have to be balloted as a revision to NEMA MW 1000
{"title":"2005 report on developments in the solderability requirements for the NEMA MW 1000 magnet wire standard","authors":"S. J. Wentz","doi":"10.1109/EEIC.2005.1566247","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566247","url":null,"abstract":"During the past year there has been a considerable amount of activity aimed at revising the NEMA MW 1000 solderability standards to make them more consistent across the full size range of all magnet wire products. At the same time efforts continue toward harmonization with the IEC winding wire solderability standards. The final result will establish more meaningful and consistent solderability requirements in NEMA MW 1000. The current NEMA magnet wire solderability standards and our efforts to harmonize with International Electrotechnical Commission (IEC) winding wire solderability standards are briefly reviewed with special emphasis on those solderability changes introduced into NEMA MW 1000. Specifically, changes that will be discussed include modifications to NEMA solderability temperatures and the maximum time allowed for proper soldering at these temperatures. The paper then reviews the results of an industry wide solderability study of various magnet wire products in the 10-52 AWG size range to the proposed new requirements for single, heavy, and triple builds. The solderability changes discussed in this paper will have to be balloted as a revision to NEMA MW 1000","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"28 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":"133594123","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 : 1900-01-01DOI: 10.1109/EEIC.2005.1566257
P. Maughan
Historically turbine-generator condition was monitored by rather primitive instrumentation, e.g., ammeters, voltmeters, temperature sensors. More advanced instrumentation devices have been added in the last 25+ years, e.g., partial discharge, turn-short flux probe, core monitors. But there still remains little or no detection capability for some of the major deterioration mechanisms, e.g., bar vibration without partial discharge, stator bar clip liquid leaks, series/phase joint copper cracking, developing field turn cracks, field insulation abrasion/cracks, retaining ring corrosion and cracks, field forging cracks. This paper will discuss root causes and progression rates of some generator deterioration mechanisms. The resulting negative impact on generator reliability of extending the periods between outage inspections can be high. Advantages of remaining with the historic 5-year period between outages will be illustrated
{"title":"Monitoring of generator condition and some limitations thereof","authors":"P. Maughan","doi":"10.1109/EEIC.2005.1566257","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566257","url":null,"abstract":"Historically turbine-generator condition was monitored by rather primitive instrumentation, e.g., ammeters, voltmeters, temperature sensors. More advanced instrumentation devices have been added in the last 25+ years, e.g., partial discharge, turn-short flux probe, core monitors. But there still remains little or no detection capability for some of the major deterioration mechanisms, e.g., bar vibration without partial discharge, stator bar clip liquid leaks, series/phase joint copper cracking, developing field turn cracks, field insulation abrasion/cracks, retaining ring corrosion and cracks, field forging cracks. This paper will discuss root causes and progression rates of some generator deterioration mechanisms. The resulting negative impact on generator reliability of extending the periods between outage inspections can be high. Advantages of remaining with the historic 5-year period between outages will be illustrated","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"15 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":"129329371","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 : 1900-01-01DOI: 10.1109/EEIC.2005.1566300
T. Broomfield, S. Willard, A. Traylor
The hammer is the curse of coil winders everywhere. When given the task of winding a 3 AWG copper wire or .040" thick foil around a square arbor, the technician resignedly grabs his hammer and begins not-so-much a winding operation as a slow, damage-inducing forming operation. At best, this results in a fair quality coil and a weary employee. At worst, you are left with an inconsistent mass of turns and damaged insulation that does not fit in the space allowed and a poor soul with Carpal Tunnel Syndrome. The purpose of this paper is to discuss the challenges of winding coils with heavy wire and foils and the methods and techniques that may be employed to improve productivity, insure quality and protect the winding technician
{"title":"Foil and heavy wire winding and tensioning","authors":"T. Broomfield, S. Willard, A. Traylor","doi":"10.1109/EEIC.2005.1566300","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566300","url":null,"abstract":"The hammer is the curse of coil winders everywhere. When given the task of winding a 3 AWG copper wire or .040\" thick foil around a square arbor, the technician resignedly grabs his hammer and begins not-so-much a winding operation as a slow, damage-inducing forming operation. At best, this results in a fair quality coil and a weary employee. At worst, you are left with an inconsistent mass of turns and damaged insulation that does not fit in the space allowed and a poor soul with Carpal Tunnel Syndrome. The purpose of this paper is to discuss the challenges of winding coils with heavy wire and foils and the methods and techniques that may be employed to improve productivity, insure quality and protect the winding technician","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"36 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":"129309228","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 : 1900-01-01DOI: 10.1109/EEIC.2005.1566301
T. Manning
Manufacturing coils with fine wire AWG #36 to #46 requires special consideration to be given to every operation in the manufacturing process. Obviously, the main reason for such detailed considerations is the small size of the wire with very low tensile strength and small cross sectional area. Proper attention to each operation increases quality and reduces manufacturing cost The most common operations are identified and discussed with the exception of winding because winding and tension are covered in many other technical references
{"title":"Special problems incurred when manufacturing coils with fine magnet wire","authors":"T. Manning","doi":"10.1109/EEIC.2005.1566301","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566301","url":null,"abstract":"Manufacturing coils with fine wire AWG #36 to #46 requires special consideration to be given to every operation in the manufacturing process. Obviously, the main reason for such detailed considerations is the small size of the wire with very low tensile strength and small cross sectional area. Proper attention to each operation increases quality and reduces manufacturing cost The most common operations are identified and discussed with the exception of winding because winding and tension are covered in many other technical references","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"79 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":"115887410","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 : 1900-01-01DOI: 10.1109/EEIC.2005.1566258
C. Kane, A. Golubev
Industry statistics suggest that 80% of all plant and equipment failures occur on a random basis and only 20% of the failures are age related. This means that 80% of failures have not been detected with common test and maintenance practices and therefore these failures have not been prevented. Based on different sources up to 30-35% of large power transformer failures are attributed to bushing insulation failures. About half of these bushing failures result in an explosion and fire. In today's competitive environment, increasing demands are being placed on the management of physical assets. Advances in technology are allowing new approaches to maintenance. These include reliability-centered maintenance, predictive maintenance, condition monitoring, and expert systems. Trend setting organizations are increasingly taking advantage of the convergence of these new technologies to implement proactive maintenance programs
{"title":"On line monitoring of bushings on large power transformers","authors":"C. Kane, A. Golubev","doi":"10.1109/EEIC.2005.1566258","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566258","url":null,"abstract":"Industry statistics suggest that 80% of all plant and equipment failures occur on a random basis and only 20% of the failures are age related. This means that 80% of failures have not been detected with common test and maintenance practices and therefore these failures have not been prevented. Based on different sources up to 30-35% of large power transformer failures are attributed to bushing insulation failures. About half of these bushing failures result in an explosion and fire. In today's competitive environment, increasing demands are being placed on the management of physical assets. Advances in technology are allowing new approaches to maintenance. These include reliability-centered maintenance, predictive maintenance, condition monitoring, and expert systems. Trend setting organizations are increasingly taking advantage of the convergence of these new technologies to implement proactive maintenance programs","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":"116949847","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 : 1900-01-01DOI: 10.1109/EEIC.2005.1566284
Hong Zhou, Yong Fan, Q. Lei
A new class of polyimide hybrid films with various amounts of silica and alumina has been synthesized by the sol-gel reaction and characterized. The hybrid films were obtained by the hydrolysis and polycondensation of heteropropyl-alumina and tetraethoxysilane (TEOS) in a polyamic acid (PAA) solution of N,N'-dimethylacetamide (DMAc), followed by heating to 350degC. The chemical structure and surface morphology of the composites films were characterized by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). The thermal stability of the composite films was tested on a Perkin-Elmer TGA7. Thermal stability of the hybrid film was increased with the nano scale inorganic oxides. The presence of silica and alumina has a significant effect on the properties of polyimide films
{"title":"Synthesis and characterization of corona-resistant polyimide/silica and alumina hybrid films","authors":"Hong Zhou, Yong Fan, Q. Lei","doi":"10.1109/EEIC.2005.1566284","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566284","url":null,"abstract":"A new class of polyimide hybrid films with various amounts of silica and alumina has been synthesized by the sol-gel reaction and characterized. The hybrid films were obtained by the hydrolysis and polycondensation of heteropropyl-alumina and tetraethoxysilane (TEOS) in a polyamic acid (PAA) solution of N,N'-dimethylacetamide (DMAc), followed by heating to 350degC. The chemical structure and surface morphology of the composites films were characterized by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). The thermal stability of the composite films was tested on a Perkin-Elmer TGA7. Thermal stability of the hybrid film was increased with the nano scale inorganic oxides. The presence of silica and alumina has a significant effect on the properties of polyimide films","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"38 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":"126218314","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 : 1900-01-01DOI: 10.1109/EEIC.2005.1566270
P. Verma, M. Roy, R. Tiwari, S. Chandra
High voltage transformers use Kraft paper to insulate the electrical windings present in the core, which is then subsequently immersed in oil. In service, the temperature of the windings will increase to typically 80degC. If the transformer is loaded to beyond its design ratings, the temperature can exceed 100degC causing the cellulose chains in the paper to cleave at an accelerated rate, resulting in the degradation of mechanical strength and performance of the insulation. If unchecked, this can lead to catastrophic failure of the transformer and accompanying disruption to electricity supply and large economic losses to the operating utility. Furfuraldehyde (FFA) is a chemical by-product, which is released into the oil by the thermal degradation of the paper winding. The concentration of FFA within the oil has been directly related to the condition of the paper insulation. Therefore, efforts are made to find the degradation of paper by evaluating the furfural compounds under accelerated thermal and electrical stress and results are correlated with degree of polymerization and tensile strength of paper. The samples are tested at 120degC, 140degC and 160degC and at electric stress 2.5 kV for 360, 720, 1080 and 1440 hours. It was observed that the Furan analysis was the best method for assessing the condition of paper insulation, as this method required the transformer oil to be sampled out and not the paper from the transformer during on-line operation of the transformer
{"title":"Generation of furanic compounds in transformer oil under accelerated thermal and electrical stress","authors":"P. Verma, M. Roy, R. Tiwari, S. Chandra","doi":"10.1109/EEIC.2005.1566270","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566270","url":null,"abstract":"High voltage transformers use Kraft paper to insulate the electrical windings present in the core, which is then subsequently immersed in oil. In service, the temperature of the windings will increase to typically 80degC. If the transformer is loaded to beyond its design ratings, the temperature can exceed 100degC causing the cellulose chains in the paper to cleave at an accelerated rate, resulting in the degradation of mechanical strength and performance of the insulation. If unchecked, this can lead to catastrophic failure of the transformer and accompanying disruption to electricity supply and large economic losses to the operating utility. Furfuraldehyde (FFA) is a chemical by-product, which is released into the oil by the thermal degradation of the paper winding. The concentration of FFA within the oil has been directly related to the condition of the paper insulation. Therefore, efforts are made to find the degradation of paper by evaluating the furfural compounds under accelerated thermal and electrical stress and results are correlated with degree of polymerization and tensile strength of paper. The samples are tested at 120degC, 140degC and 160degC and at electric stress 2.5 kV for 360, 720, 1080 and 1440 hours. It was observed that the Furan analysis was the best method for assessing the condition of paper insulation, as this method required the transformer oil to be sampled out and not the paper from the transformer during on-line operation of the transformer","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"18 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":"114693759","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 : 1900-01-01DOI: 10.1109/EEIC.2005.1566259
Z. Berler, V. Sokolov, V. Prikhodko, D. Bates
There has been a pressing need for on-line monitoring and diagnostic techniques for HV bushings and current transformers where deterioration often results in catastrophic failure. This paper expands the available information on this topic and presents the technique for the on-line measurement of dielectric power-factor and capacitance using the Doble M4000 insulation analyzer
{"title":"On-line monitoring of HV bushings and current transformers","authors":"Z. Berler, V. Sokolov, V. Prikhodko, D. Bates","doi":"10.1109/EEIC.2005.1566259","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566259","url":null,"abstract":"There has been a pressing need for on-line monitoring and diagnostic techniques for HV bushings and current transformers where deterioration often results in catastrophic failure. This paper expands the available information on this topic and presents the technique for the on-line measurement of dielectric power-factor and capacitance using the Doble M4000 insulation analyzer","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"37 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":"117024252","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 : 1900-01-01DOI: 10.1109/EEIC.2005.1566260
S. Bomben, B. Pratt
The unexpected failure of an 80 MVA hydro generator seriously damaged the stator core. A river system with high water left few options for repair. Aggressive methods were used to return the unit back to service while a new core section was delivered to site
{"title":"Experience repairing a serious stator core fault on an 80 MVA vertical water wheel generator","authors":"S. Bomben, B. Pratt","doi":"10.1109/EEIC.2005.1566260","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566260","url":null,"abstract":"The unexpected failure of an 80 MVA hydro generator seriously damaged the stator core. A river system with high water left few options for repair. Aggressive methods were used to return the unit back to service while a new core section was delivered to site","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"39 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":"123233387","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 : 1900-01-01DOI: 10.1109/EEIC.2005.1566308
B. Lovelace
The benefits of upgrading to an AC vector drive outweigh those of mechanical equivalents and other technologies. This paper will show several examples of how a vector drive can be cost effective, reduce scrap, and maximize efficiency. It will also show the advantages of updating your machine with vector technology
{"title":"Improve your machine with vector drives","authors":"B. Lovelace","doi":"10.1109/EEIC.2005.1566308","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566308","url":null,"abstract":"The benefits of upgrading to an AC vector drive outweigh those of mechanical equivalents and other technologies. This paper will show several examples of how a vector drive can be cost effective, reduce scrap, and maximize efficiency. It will also show the advantages of updating your machine with vector technology","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"74 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":"129778397","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：