Pub Date : 1991-10-07DOI: 10.1109/EEIC.1991.162565
B. Lloyd, G. Stone, J. Stein
The authors describe the development of an expert system to assist rotating machine maintenance personnel in assessing the insulation condition of their machines. The Machine Insulation Condition Assessment Advisor (MICAA) is a user-friendly PC-based software package that leads the maintenance person through an assessment of a particular motor or generator and provides diagnostic advice about necessary repairs or replacement of components.<>
{"title":"Development of an expert system to assess machine insulation condition","authors":"B. Lloyd, G. Stone, J. Stein","doi":"10.1109/EEIC.1991.162565","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162565","url":null,"abstract":"The authors describe the development of an expert system to assist rotating machine maintenance personnel in assessing the insulation condition of their machines. The Machine Insulation Condition Assessment Advisor (MICAA) is a user-friendly PC-based software package that leads the maintenance person through an assessment of a particular motor or generator and provides diagnostic advice about necessary repairs or replacement of components.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"68 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":"131996600","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.1991.162568
B. Gupta
Work done to develop a type test for turn insulation in form-wound multiturn motor coils is discussed. A concept for accelerated aging of turn insulation by applying thermal stress and electrical stress across the groundwall and the turn insulation simultaneously was developed and verified in preliminary tests on a few single coils. In the accelerated aging experiment, four to six coils were aged simultaneously. Turn insulation was aged for 500 h in ten coils and for 1000 h in twelve coils. The impulse breakdown voltages were measured for the aged and the unaged coils for comparison. Thus a type test to check the quality of turn insulation was developed. However, more tests on many more coils of different insulation design are required to establish the efficacy of the type test. The problems encountered in the tests are described, and plans for ongoing work in this area are outlined.<>
{"title":"Development of a type test for turn insulation in motor coils","authors":"B. Gupta","doi":"10.1109/EEIC.1991.162568","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162568","url":null,"abstract":"Work done to develop a type test for turn insulation in form-wound multiturn motor coils is discussed. A concept for accelerated aging of turn insulation by applying thermal stress and electrical stress across the groundwall and the turn insulation simultaneously was developed and verified in preliminary tests on a few single coils. In the accelerated aging experiment, four to six coils were aged simultaneously. Turn insulation was aged for 500 h in ten coils and for 1000 h in twelve coils. The impulse breakdown voltages were measured for the aged and the unaged coils for comparison. Thus a type test to check the quality of turn insulation was developed. However, more tests on many more coils of different insulation design are required to establish the efficacy of the type test. The problems encountered in the tests are described, and plans for ongoing work in this area are outlined.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"47 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":"132386791","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.1991.162588
M. Mesaki, F. Sano, N. Nakamura, K. Yamazaki
Self-fusing magnet wires of Class E heating resistance have been developed. It was found that the wires have self-fusing characteristics that did not change even after degradation. When applied to actual equipment, the wires can be used as fluorescent lamp ballasts of low cost and high reliability that do not require a thermal protector. This wire automatically makes the wires in the transformer short-circuited when the equipment in use is overheated beyond a given temperature rise limit, thereby making the current fuse function. Characteristics evaluated include fusing characteristics after overheating and smoke emission, and good characteristics were observed in all respects.<>
{"title":"Development of heat resistance self-fusing wire for fluorescent lamp ballast","authors":"M. Mesaki, F. Sano, N. Nakamura, K. Yamazaki","doi":"10.1109/EEIC.1991.162588","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162588","url":null,"abstract":"Self-fusing magnet wires of Class E heating resistance have been developed. It was found that the wires have self-fusing characteristics that did not change even after degradation. When applied to actual equipment, the wires can be used as fluorescent lamp ballasts of low cost and high reliability that do not require a thermal protector. This wire automatically makes the wires in the transformer short-circuited when the equipment in use is overheated beyond a given temperature rise limit, thereby making the current fuse function. Characteristics evaluated include fusing characteristics after overheating and smoke emission, and good characteristics were observed in all respects.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"9 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":"132592272","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.1991.162571
C. Pinto
Expressions that describe the variations in the capacitance and tan delta in delaminated stator winding insulation due to electrostatic forces have been obtained. Experimental results obtained on a stator whose insulation was seen to have delaminated dielectric support the suggested theory. Measurements performed at a relatively low voltage could be used to determine the extent of delamination and possibly the extent of aging of the insulation.<>
{"title":"Variations in the capacitance of delaminated HV stator insulation due to electrostatically generated forces","authors":"C. Pinto","doi":"10.1109/EEIC.1991.162571","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162571","url":null,"abstract":"Expressions that describe the variations in the capacitance and tan delta in delaminated stator winding insulation due to electrostatic forces have been obtained. Experimental results obtained on a stator whose insulation was seen to have delaminated dielectric support the suggested theory. Measurements performed at a relatively low voltage could be used to determine the extent of delamination and possibly the extent of aging of the insulation.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"98 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":"123239576","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.1991.162564
T. Cussen
The present helical coil test method as specified in ASTM D-1676 and NEMA NW-1000 presents some difficulties when a wide range of wire sizes is being tested. Members of the NEMA Magnet Wire Technical Committee are currently engaged in the evaluation of new bond strength test methods which have been found to minimize these difficulties and provide more consistent results. The new method uses a tested figure-eight coil that is then bonded and tested with a stress/strain analyzer. The author explains the new test procedures and compares them to the existing ASTM and NEMA standards and a proposed IEC test for bondable winding wires. The results of the testing that has been performed to date on various sizes of bondable magnet wires are summarized. The method provides several advantages over the present helical coil method.<>
{"title":"A new bond strength test method for testing of bondable magnet wires","authors":"T. Cussen","doi":"10.1109/EEIC.1991.162564","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162564","url":null,"abstract":"The present helical coil test method as specified in ASTM D-1676 and NEMA NW-1000 presents some difficulties when a wide range of wire sizes is being tested. Members of the NEMA Magnet Wire Technical Committee are currently engaged in the evaluation of new bond strength test methods which have been found to minimize these difficulties and provide more consistent results. The new method uses a tested figure-eight coil that is then bonded and tested with a stress/strain analyzer. The author explains the new test procedures and compares them to the existing ASTM and NEMA standards and a proposed IEC test for bondable winding wires. The results of the testing that has been performed to date on various sizes of bondable magnet wires are summarized. The method provides several advantages over the present helical coil method.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"142 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":"115948830","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.1991.162613
T. Oommen
A thin-film capacitive humidity sensor was tested in transformer oil for moisture sensing. This sensor was found to respond well to moisture levels from dry to very wet conditions over a wide temperature range, typical for oil in transformers in cold and warm weather. Routine calibration was done in oil for the temperature range 20 to 80 degrees C for each sensor. The moisture content of oil may be obtained as percent saturation or as ppm moisture level from the current output of the sensor. Further testing was done in a 500 kVA test transformer in which the sensor unit was installed. It was possible to follow the moisture changes during load variation. The ppm moisture content changed roughly in the same manner as the temperature, but the saturation curve showed a tendency to maintain a steady value, except during shutdown. Moisture saturation in oil increased abnormally due to the slow return of moisture from oil to the paper insulation. The moisture sensor should therefore be a valuable tool in warning of hazardous conditions from moisture saturation in oil.<>
{"title":"On-line moisture sensing in transformers","authors":"T. Oommen","doi":"10.1109/EEIC.1991.162613","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162613","url":null,"abstract":"A thin-film capacitive humidity sensor was tested in transformer oil for moisture sensing. This sensor was found to respond well to moisture levels from dry to very wet conditions over a wide temperature range, typical for oil in transformers in cold and warm weather. Routine calibration was done in oil for the temperature range 20 to 80 degrees C for each sensor. The moisture content of oil may be obtained as percent saturation or as ppm moisture level from the current output of the sensor. Further testing was done in a 500 kVA test transformer in which the sensor unit was installed. It was possible to follow the moisture changes during load variation. The ppm moisture content changed roughly in the same manner as the temperature, but the saturation curve showed a tendency to maintain a steady value, except during shutdown. Moisture saturation in oil increased abnormally due to the slow return of moisture from oil to the paper insulation. The moisture sensor should therefore be a valuable tool in warning of hazardous conditions from moisture saturation in oil.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"45 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":"126726301","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.1991.162609
F. Young
A novel concept of power systems design and operation has been developed: flexible AC transmission systems (FACTS). FACTS technology can increase the loading on existing systems and assist in directing power flow in an interconnected network. The concept is based on the following view: systems are mechanically controlled for the most part, and the speed of response is slow. If control could be achieved at electronic speed with smart power electronic devices, great strides could be made in increasing loading of existing transmission systems and providing more flexible systems in the future where power flows could be controlled to facilitate business transactions among utilities. The first element in this work is to develop large semiconductors capable of handling power-class voltages and currents. A second area of research is now producing the smart devices. Controllers can be built to use the characteristics of these smart power electronic devices to perform functions such as controlling voltage, impedance, and phase angle.<>
{"title":"Flexible AC transmission systems: technology for the future","authors":"F. Young","doi":"10.1109/EEIC.1991.162609","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162609","url":null,"abstract":"A novel concept of power systems design and operation has been developed: flexible AC transmission systems (FACTS). FACTS technology can increase the loading on existing systems and assist in directing power flow in an interconnected network. The concept is based on the following view: systems are mechanically controlled for the most part, and the speed of response is slow. If control could be achieved at electronic speed with smart power electronic devices, great strides could be made in increasing loading of existing transmission systems and providing more flexible systems in the future where power flows could be controlled to facilitate business transactions among utilities. The first element in this work is to develop large semiconductors capable of handling power-class voltages and currents. A second area of research is now producing the smart devices. Controllers can be built to use the characteristics of these smart power electronic devices to perform functions such as controlling voltage, impedance, and phase angle.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"8 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120812674","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.1991.162563
D.A. Metzler, E. Scherrer
The authors compare the results of HVC testing of fine magnet wire with those obtained with mercury bath testing. The results of a systematic study of HVC test conditions (test voltage and pulley groove angle) are discussed, along with some limited round robin test data. HVC test behavior is presented using response surface concepts, and these data are used to suggest possible improvements to HVC testing method for fine wire. Possible response differences between the older single-pulley HVC tester design and the new pulley design are addressed.<>
{"title":"Improving HVC test accuracy and reliability with fine magnet wire","authors":"D.A. Metzler, E. Scherrer","doi":"10.1109/EEIC.1991.162563","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162563","url":null,"abstract":"The authors compare the results of HVC testing of fine magnet wire with those obtained with mercury bath testing. The results of a systematic study of HVC test conditions (test voltage and pulley groove angle) are discussed, along with some limited round robin test data. HVC test behavior is presented using response surface concepts, and these data are used to suggest possible improvements to HVC testing method for fine wire. Possible response differences between the older single-pulley HVC tester design and the new pulley design are addressed.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"77 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":"123598225","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.1991.162584
K. Hanaoka, T. Tsuboi, S. Takahashi, K. Ueda, S. Chabata
A novel high-performance self-bonding wire (SBWG) with better flowability at low temperature and higher bond strength at elevated temperature than the previously used self-bonding wire (SBW5) has been developed. The wire was developed by introducing new polymers and a new curing agent as self-bonding resin formulas. SBWG can reduce the thickness of the bonding layer because of its good flowability and high bond strength. SBWG shows excellent refrigerant resistance, equal to that of SBW5.<>
{"title":"New high performance self-bonding magnet wire","authors":"K. Hanaoka, T. Tsuboi, S. Takahashi, K. Ueda, S. Chabata","doi":"10.1109/EEIC.1991.162584","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162584","url":null,"abstract":"A novel high-performance self-bonding wire (SBWG) with better flowability at low temperature and higher bond strength at elevated temperature than the previously used self-bonding wire (SBW5) has been developed. The wire was developed by introducing new polymers and a new curing agent as self-bonding resin formulas. SBWG can reduce the thickness of the bonding layer because of its good flowability and high bond strength. SBWG shows excellent refrigerant resistance, equal to that of SBW5.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"56 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":"126213312","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.1991.162570
G. Deutschmann, K. Kraßnitzer
Tests have shown that the quality of a high-voltage insulation is influenced by the type and quality of the mica paper used. A homogeneous and fine distribution of the mica scales as given in the calcined mica paper results in a higher dielectric strength compared to uncalcined mica paper. Other contributing factors are the carrier used, the type of application method employed, and the widths of the tapes, all of which can have a major effect on the electrical strength. Taking this into account, producers and users of high-voltage insulating materials may develop and select the optimum quality for a given insulation design requirement.<>
{"title":"Influence of mica paper type and construction on the dielectric properties of VPI and resin rich high voltage insulation","authors":"G. Deutschmann, K. Kraßnitzer","doi":"10.1109/EEIC.1991.162570","DOIUrl":"https://doi.org/10.1109/EEIC.1991.162570","url":null,"abstract":"Tests have shown that the quality of a high-voltage insulation is influenced by the type and quality of the mica paper used. A homogeneous and fine distribution of the mica scales as given in the calcined mica paper results in a higher dielectric strength compared to uncalcined mica paper. Other contributing factors are the carrier used, the type of application method employed, and the widths of the tapes, all of which can have a major effect on the electrical strength. Taking this into account, producers and users of high-voltage insulating materials may develop and select the optimum quality for a given insulation design requirement.<<ETX>>","PeriodicalId":367238,"journal":{"name":"[1991] Proceedings of the 20th Electrical Electronics Insulation Conference","volume":"34 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":"124931933","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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