Pub Date : 2005-12-01DOI: 10.1109/EEIC.2005.1566340
B. Raczkowski, P. Sauer
The analysis and simulation of a doubly-fed induction machine used as a power flow control device is examined. This is a system that transfers power between one power system area and another using a doubly-fed induction machine as a rotary transformer containing rotor and stator windings. The ability to control the power flow by adjusting the rotor shaft angle is demonstrated. A test system was developed and experiments were carried out on an actual machine
{"title":"Doubly-fed induction machine analysis for power flow control","authors":"B. Raczkowski, P. Sauer","doi":"10.1109/EEIC.2005.1566340","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566340","url":null,"abstract":"The analysis and simulation of a doubly-fed induction machine used as a power flow control device is examined. This is a system that transfers power between one power system area and another using a doubly-fed induction machine as a rotary transformer containing rotor and stator windings. The ability to control the power flow by adjusting the rotor shaft angle is demonstrated. A test system was developed and experiments were carried out on an actual machine","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114283100","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 : 2005-09-01DOI: 10.1109/DEMPED.2005.4662516
P. Marek, W. Grubelnik, B. Koerbler
The possibility to increase operating performance and efficiency of an electric machine can be achieved through the improvement or modification of the components of the primary insulating material. Relevant variables in the construction of a machine can be found in the components of the insulating materials and their overall thickness. These components can influence the electric strength and overall service life. In addition, the electrical insulation system dictates the thermal classification and therefore the construction of a machine. It is understood that a thinner insulation exhibits a higher thermal conductivity than a comparable thicker one. By improving the thermal conductivity of the insulation through thickness reduction, it is possible to increase the current density in the conductors. However, with such a design change, the electrical strength and service life of the insulation remains an important consideration. An improvement in the thermal conductivity of a mica tape can be achieved through the addition of highly thermally conductive materials or by reducing the thickness of the carrier components. However, these alterations to a standard insulation often result in a decrease in the electrical and or the mechanical properties of the insulating material. In this paper, a new mica tape construction will be discussed. It will propose that it is possible to not only improve the mechanical and electrical properties of an insulating material, but to also reduce its overall thickness, while improving service life. The new development reduces the thickness of a standard insulating tape by 15%. With this achievement, both efficiency and power output of a machine design can be increased. Power calculations indicate that this increase is considered to be significant
{"title":"A new approach in insulation systems for rotating machines","authors":"P. Marek, W. Grubelnik, B. Koerbler","doi":"10.1109/DEMPED.2005.4662516","DOIUrl":"https://doi.org/10.1109/DEMPED.2005.4662516","url":null,"abstract":"The possibility to increase operating performance and efficiency of an electric machine can be achieved through the improvement or modification of the components of the primary insulating material. Relevant variables in the construction of a machine can be found in the components of the insulating materials and their overall thickness. These components can influence the electric strength and overall service life. In addition, the electrical insulation system dictates the thermal classification and therefore the construction of a machine. It is understood that a thinner insulation exhibits a higher thermal conductivity than a comparable thicker one. By improving the thermal conductivity of the insulation through thickness reduction, it is possible to increase the current density in the conductors. However, with such a design change, the electrical strength and service life of the insulation remains an important consideration. An improvement in the thermal conductivity of a mica tape can be achieved through the addition of highly thermally conductive materials or by reducing the thickness of the carrier components. However, these alterations to a standard insulation often result in a decrease in the electrical and or the mechanical properties of the insulating material. In this paper, a new mica tape construction will be discussed. It will propose that it is possible to not only improve the mechanical and electrical properties of an insulating material, but to also reduce its overall thickness, while improving service life. The new development reduces the thickness of a standard insulating tape by 15%. With this achievement, both efficiency and power output of a machine design can be increased. Power calculations indicate that this increase is considered to be significant","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125114979","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 : 2005-08-01DOI: 10.1109/EEIC.2005.1566324
W. Sommerville, J. Gover, R. Sanchez, J. Bou
In the discharge of a capacitor the current was measured with a current viewing transformer (CVT). In addition to measuring the current flowing through the CVT primary, a 51 MHz noise signal was added to the primary current. When the CVT was covered with a gold shield, the noise was eliminated. Analysis of the measured results indicate that the gold layer reflected the electromagnetic that was generated by current flowing in the primary and that the capacitance between the shield and the CVT secondary had no measurable effect on the CVT output
{"title":"Modeling of capacitive and electromagnetic field shielding effects in a CVT","authors":"W. Sommerville, J. Gover, R. Sanchez, J. Bou","doi":"10.1109/EEIC.2005.1566324","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566324","url":null,"abstract":"In the discharge of a capacitor the current was measured with a current viewing transformer (CVT). In addition to measuring the current flowing through the CVT primary, a 51 MHz noise signal was added to the primary current. When the CVT was covered with a gold shield, the noise was eliminated. Analysis of the measured results indicate that the gold layer reflected the electromagnetic that was generated by current flowing in the primary and that the capacitance between the shield and the CVT secondary had no measurable effect on the CVT output","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"520 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130176634","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.2005.1566321
D. Laurenty, K. Alewine, N. Frost
The performance of resins for electrical insulation systems over time is dependent on the stability of the resin. There are standardized tests that can be performed to monitor the resin and adjust it, as necessary, to maintain resin integrity. This paper will discuss some of the tests that are most commonly utilized in the industry, as well as discussion of the meaning of the results of these tests. The resin manufacturer should be consulted prior to any adjustments to the tank of resin
{"title":"Use of test procedures for resin tank maintenance","authors":"D. Laurenty, K. Alewine, N. Frost","doi":"10.1109/EEIC.2005.1566321","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566321","url":null,"abstract":"The performance of resins for electrical insulation systems over time is dependent on the stability of the resin. There are standardized tests that can be performed to monitor the resin and adjust it, as necessary, to maintain resin integrity. This paper will discuss some of the tests that are most commonly utilized in the industry, as well as discussion of the meaning of the results of these tests. The resin manufacturer should be consulted prior to any adjustments to the tank of resin","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":"117185341","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.2005.1566249
M. Leibowitz, E. Scherrer
IEC winding wire standards in many ways parallel the information provided in NEMA MW 1000. IEC publications 60317-0-1 through 60317-0-6 provide definitions and general requirements such as dimensions for several standard types of winding wire in a manner similar to NEMA MW 1000 Part 1. IEC publications 60317-1 through 60317-55 provide specifications for particular requirements for various standard winding wires in a manner similar to the standards provided in NEMA MW 1000 Part 2. IEC publications 60851-1 through 60851-5 provide the details of various winding wire test procedures in a manner similar to the information provided in NEMA MW 1000 Part 3. IEC publications 60264-1 through 60264-5 provide winding wire packaging specifications and test procedures for a number of different IEC standard winding wire packages in a manner similar to the information provided in NEMA MW 1000 Appendix B. This paper will discuss the changes that have been made to the aforementioned IEC publications since 2003, and discuss in some detail the similarities and differences between IEC and NEMA MW 1000 requirements and test procedures. The paper will also discuss past efforts and future opportunities for improved harmonization between IEC and NEMA winding wire standards and test procedures
{"title":"2005 report on developments in IEC winding wire standards and test methods","authors":"M. Leibowitz, E. Scherrer","doi":"10.1109/EEIC.2005.1566249","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566249","url":null,"abstract":"IEC winding wire standards in many ways parallel the information provided in NEMA MW 1000. IEC publications 60317-0-1 through 60317-0-6 provide definitions and general requirements such as dimensions for several standard types of winding wire in a manner similar to NEMA MW 1000 Part 1. IEC publications 60317-1 through 60317-55 provide specifications for particular requirements for various standard winding wires in a manner similar to the standards provided in NEMA MW 1000 Part 2. IEC publications 60851-1 through 60851-5 provide the details of various winding wire test procedures in a manner similar to the information provided in NEMA MW 1000 Part 3. IEC publications 60264-1 through 60264-5 provide winding wire packaging specifications and test procedures for a number of different IEC standard winding wire packages in a manner similar to the information provided in NEMA MW 1000 Appendix B. This paper will discuss the changes that have been made to the aforementioned IEC publications since 2003, and discuss in some detail the similarities and differences between IEC and NEMA MW 1000 requirements and test procedures. The paper will also discuss past efforts and future opportunities for improved harmonization between IEC and NEMA winding wire standards and test procedures","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"83 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":"125909194","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.2005.1566313
E. Ubong, C. Mizell, G. Slota, N. Lovria
Incorporation of ultra capacitors to augment power transient's requirement in a hybrid mode in a Ballard fuel cell mounted on a Global Electric Motor's (GEM) vehicle. A Ballard Nexatrade fuel cell, six 2600 Farads Maxwell's ultra capacitors connected in series and a load cell, are tested on a bench and later on a GEM a vehicle. A custom developed DC-DC converter is used to boost the fuel cell stack input voltage from 26 V DC to 72 V DC. The controller performs the ultracapacitor's recharging functions while the ultra capacitors augment for power needs during transients. A very stable operational performance of the vehicle is observed throughout the range tested and the state of charge of the battery is satisfactory. The results show that the test results with ultra capacitors provide a smooth and gradual peak power augmentation
在全球电机公司(GEM)车辆上安装的巴拉德燃料电池中，加入超级电容器以增加混合动力模式下的功率瞬态要求。一个Ballard Nexatrade燃料电池，6个2600 Farads Maxwell超级电容器串联在一起，以及一个负载传感器，在工作台上进行测试，随后在GEM车辆上进行测试。定制开发的DC-DC转换器用于将燃料电池堆输入电压从26 V DC提升到72 V DC。控制器执行超级电容器的充电功能，而超级电容器在瞬态期间增加电力需求。在整个测试范围内，观察到车辆的运行性能非常稳定，电池的充电状态令人满意。结果表明，使用超级电容器的测试结果提供了平稳渐进的峰值功率增加
{"title":"Ultracapacitor with Ballard Nexa in a GEM vehicle in a hybrid mode","authors":"E. Ubong, C. Mizell, G. Slota, N. Lovria","doi":"10.1109/EEIC.2005.1566313","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566313","url":null,"abstract":"Incorporation of ultra capacitors to augment power transient's requirement in a hybrid mode in a Ballard fuel cell mounted on a Global Electric Motor's (GEM) vehicle. A Ballard Nexatrade fuel cell, six 2600 Farads Maxwell's ultra capacitors connected in series and a load cell, are tested on a bench and later on a GEM a vehicle. A custom developed DC-DC converter is used to boost the fuel cell stack input voltage from 26 V DC to 72 V DC. The controller performs the ultracapacitor's recharging functions while the ultra capacitors augment for power needs during transients. A very stable operational performance of the vehicle is observed throughout the range tested and the state of charge of the battery is satisfactory. The results show that the test results with ultra capacitors provide a smooth and gradual peak power augmentation","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"62 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":"115247032","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.2005.1566263
L. Nian, Xie Chi, Teng Fusheng
The transient field-circuit model of large generators has been studied, and the field-circuit analysis for the transient over-voltage of large power stations is presented. For the large generator stricken by the over-voltage from power stations, the transient field distribution in the stator winding insulator can be analyzed on line, and some insulation fault point and domain in generators can be predicted and even detected successfully. Moreover, the simulation shows that the method is feasible and valid for the generator monitoring system of large power stations
{"title":"Field-circuit analysis of winding insulation condition of generators stricken by overvoltage","authors":"L. Nian, Xie Chi, Teng Fusheng","doi":"10.1109/EEIC.2005.1566263","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566263","url":null,"abstract":"The transient field-circuit model of large generators has been studied, and the field-circuit analysis for the transient over-voltage of large power stations is presented. For the large generator stricken by the over-voltage from power stations, the transient field distribution in the stator winding insulator can be analyzed on line, and some insulation fault point and domain in generators can be predicted and even detected successfully. Moreover, the simulation shows that the method is feasible and valid for the generator monitoring system of large power stations","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"17 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":"129783657","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.2005.1566279
S. M. Patel, H. Penrose, P. Allaire, Z. Lin
Thousands of patients suffering from congestive heart failure (CHF) benefit from safe and reliable, temporary left ventricular assist devices (LVAD). Designed to perform in parallel with the left ventricle of the native heart, there are only five devices in the United States approved for use of up to 2 years to support CHF patients until a donor heart becomes available, or the heart recovers some function. With limited donor hearts (~3000), fully implantable LVADs are currently being designed for up to 10 years and are a complex medical device with multiple subsystems. The permanent magnet, brushless DC (BLDC) motor subsystem is evaluated for insulation failures using simulations of the electrical circuit model in MatLab (Mathworks). Variations in the number of turns lost and groundwall insulation have a direct effect on the current available to drive the motor. This preliminary model provides results that support the hypothesis that LVAD insulation failures lead to poor pump performance, and potentially, pump failure
{"title":"An initial investigation of insulation fault effects on LVAD motor performance","authors":"S. M. Patel, H. Penrose, P. Allaire, Z. Lin","doi":"10.1109/EEIC.2005.1566279","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566279","url":null,"abstract":"Thousands of patients suffering from congestive heart failure (CHF) benefit from safe and reliable, temporary left ventricular assist devices (LVAD). Designed to perform in parallel with the left ventricle of the native heart, there are only five devices in the United States approved for use of up to 2 years to support CHF patients until a donor heart becomes available, or the heart recovers some function. With limited donor hearts (~3000), fully implantable LVADs are currently being designed for up to 10 years and are a complex medical device with multiple subsystems. The permanent magnet, brushless DC (BLDC) motor subsystem is evaluated for insulation failures using simulations of the electrical circuit model in MatLab (Mathworks). Variations in the number of turns lost and groundwall insulation have a direct effect on the current available to drive the motor. This preliminary model provides results that support the hypothesis that LVAD insulation failures lead to poor pump performance, and potentially, pump failure","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"138 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":"128470240","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.2005.1566275
A. Mesrobian, H. Brandes
Present HV insulation systems utilize the well-accepted global VPI methods that have been in place since the mid 60's. These systems have been rated class F and in most continuous duty applications have been operating at class B temperatures. The exceptional operating performance of these systems also has hampered attempts to introduce new systems with cost effective materials. Due to the competitive nature of HV machines, nontechnical assessments have been made in favor of certain materials despite ample test data. User groups have generated standards specifying materials or process techniques that prevent progress in developing new materials that can withstand higher operating temperatures and stress levels. This paper attempts to evaluate the merits of operation at higher temperature with a system that has been introduced over 15 years, with additional testing conducted over the past four years
{"title":"Merits of high temperature HV insulation system for rotating machines","authors":"A. Mesrobian, H. Brandes","doi":"10.1109/EEIC.2005.1566275","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566275","url":null,"abstract":"Present HV insulation systems utilize the well-accepted global VPI methods that have been in place since the mid 60's. These systems have been rated class F and in most continuous duty applications have been operating at class B temperatures. The exceptional operating performance of these systems also has hampered attempts to introduce new systems with cost effective materials. Due to the competitive nature of HV machines, nontechnical assessments have been made in favor of certain materials despite ample test data. User groups have generated standards specifying materials or process techniques that prevent progress in developing new materials that can withstand higher operating temperatures and stress levels. This paper attempts to evaluate the merits of operation at higher temperature with a system that has been introduced over 15 years, with additional testing conducted over the past four years","PeriodicalId":267510,"journal":{"name":"Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005.","volume":"2 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":"129072502","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.2005.1566278
B. Du, Gu Liang
In this paper, an artificial atmospheric chamber was set up to investigate the fractal characteristic of discharge currents on polybutylene terephthalate under a reduced pressure. The decompression chamber was made from a glass cylinder with two sheets of acrylic board for the cover and the bottom. The test equipment was placed in the chamber, and the pressure was reduced from 100 kPa to 1 kPa by using a rotary pump. The experiment was carried out on the sample surface by a DC pulse voltage applied between a plate electrode and a needle electrode. The distance between the two electrodes was 6 mm. The frequency of applied pulse voltage ranged from 100 Hz to 250 Hz. The effects of atmospheric pressure and the frequency of applied voltage on the discharge currents have been studied. The fractal theory is used to analyze the discharge characteristics. The fractal dimension of discharge currents increases inversely with decreasing the atmospheric pressure and decreases with increasing the frequency of applied voltage. It is suggested that the fractal dimension can be used to analyze the insulation degradation of polybutylene terephthalate
{"title":"Fractal analysis of discharge current on polybutylene terephthalate","authors":"B. Du, Gu Liang","doi":"10.1109/EEIC.2005.1566278","DOIUrl":"https://doi.org/10.1109/EEIC.2005.1566278","url":null,"abstract":"In this paper, an artificial atmospheric chamber was set up to investigate the fractal characteristic of discharge currents on polybutylene terephthalate under a reduced pressure. The decompression chamber was made from a glass cylinder with two sheets of acrylic board for the cover and the bottom. The test equipment was placed in the chamber, and the pressure was reduced from 100 kPa to 1 kPa by using a rotary pump. The experiment was carried out on the sample surface by a DC pulse voltage applied between a plate electrode and a needle electrode. The distance between the two electrodes was 6 mm. The frequency of applied pulse voltage ranged from 100 Hz to 250 Hz. The effects of atmospheric pressure and the frequency of applied voltage on the discharge currents have been studied. The fractal theory is used to analyze the discharge characteristics. The fractal dimension of discharge currents increases inversely with decreasing the atmospheric pressure and decreases with increasing the frequency of applied voltage. It is suggested that the fractal dimension can be used to analyze the insulation degradation of polybutylene terephthalate","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":"131967063","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：