Pub Date : 2010-11-18DOI: 10.1109/ICHVE.2010.5640718
P. Dixit, V. Krishnan, G. Nagabhushana
In the present work, flashover behaviour of polluted ceramic insulators is investigated by means of experimental tests and a mathematical model. As a first step, experiments were conducted in two phases. In the first phase arc voltage-arc current behaviour were studied for scintillations on the underside of polluted insulator for different Equivalent Salt Deposit Densities and arc currents. These experimental results were then used to determine the arc constants A and n of Ayrton's arc voltage gradient equation. In the second phase, critical current (current just before flashover) and flashover voltages were obtained experimentally for three different types of disc insulators. Based on the experimental results, a new generalized mathematical model was developed for the flashover voltage of polluted insulators. The mathematical model includes geometrical parameters of the insulator, pollution severity, critical arc length, pressure, humidity and arc constants. The model was also verified with the experimental and theoretical results of other researchers and the agreement is good.
{"title":"A new mathematical model for flashover voltages of polluted porcelain insulators","authors":"P. Dixit, V. Krishnan, G. Nagabhushana","doi":"10.1109/ICHVE.2010.5640718","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640718","url":null,"abstract":"In the present work, flashover behaviour of polluted ceramic insulators is investigated by means of experimental tests and a mathematical model. As a first step, experiments were conducted in two phases. In the first phase arc voltage-arc current behaviour were studied for scintillations on the underside of polluted insulator for different Equivalent Salt Deposit Densities and arc currents. These experimental results were then used to determine the arc constants A and n of Ayrton's arc voltage gradient equation. In the second phase, critical current (current just before flashover) and flashover voltages were obtained experimentally for three different types of disc insulators. Based on the experimental results, a new generalized mathematical model was developed for the flashover voltage of polluted insulators. The mathematical model includes geometrical parameters of the insulator, pollution severity, critical arc length, pressure, humidity and arc constants. The model was also verified with the experimental and theoretical results of other researchers and the agreement is good.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130091726","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640716
H. Illias, George Chen, P. Lewin
Partial discharge (PD) events within a closed-volume cavity in a dielectric material can cause a temperature change in the cavity. This may influence the occurrence of following PDs because the pressure in the cavity is affected, which changes the inception voltage level for the next PD. In this paper, a two-dimensional axial symmetric model geometry consisting of a spherical cavity within a homogeneous dielectric material has been developed using Finite Element Analysis (FEA) method. The model has been used to simulate the temperature distribution in the cavity before and after a PD. The variation in the temperature distribution is implemented in the PD model to study the influence of temperature and pressure change in the cavity due to a discharge on the sequence of PD events.
{"title":"Modelling of temporal temperature and pressure change due to partial discharge events within a spherical cavity in a solid dielectric material using finite element analysis","authors":"H. Illias, George Chen, P. Lewin","doi":"10.1109/ICHVE.2010.5640716","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640716","url":null,"abstract":"Partial discharge (PD) events within a closed-volume cavity in a dielectric material can cause a temperature change in the cavity. This may influence the occurrence of following PDs because the pressure in the cavity is affected, which changes the inception voltage level for the next PD. In this paper, a two-dimensional axial symmetric model geometry consisting of a spherical cavity within a homogeneous dielectric material has been developed using Finite Element Analysis (FEA) method. The model has been used to simulate the temperature distribution in the cavity before and after a PD. The variation in the temperature distribution is implemented in the PD model to study the influence of temperature and pressure change in the cavity due to a discharge on the sequence of PD events.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129064862","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640714
Li-qun Shang
The double circuit EHV transmission lines have been widely used because of its many advantages. But when faults occur, the style of fault and the operation condition are more complicated than that on the single circuit transmission line. The faults occurred on the transmission lines is mainly transient fault. The auto-reclosure is normally applied after the fault line tripped to improve the power supplies reliability and the power system safety. But if the fault is permanent and the auto-reclosure reclosed accordingly, the power system and its apparatus will suffer short circuit current again, resulting further damage of the equipment and making power system instability. Thus, it is very important to distinguish the transient and permanent fault before the tripped fault line auto-reclose. If the EHV line has shunt reactor, identification of fault nature becomes even more difficult. There are several methods proposed for distinguishing the transient and permanent fault but mainly for single circuit transmission line. In this paper, a novel method is proposed for the EHV double circuit transmission lines with shunt reactor. After tripped, the phase voltage across shunt reactor was calculated using our established transient fault line model regardless of the fault is transient or permanent. The difference between the calculated voltage and the measured voltage of the fault phase across shunt reactor was employed to identify transient or permanent fault. The amplitude ratio, i.e. the difference of the voltage between calculated and measured to the voltage across neutral reactor was used to judge fault nature. If the amplitude ratio is greater less than 1, the fault is regarded as transient. If it is more than 1, it is regarded as permanent. This result can be further verified by EMTP simulation.
{"title":"Fault nature identification for single-phase adaptive reclosure on double circuit EHV transmission lines with shunt reactors","authors":"Li-qun Shang","doi":"10.1109/ICHVE.2010.5640714","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640714","url":null,"abstract":"The double circuit EHV transmission lines have been widely used because of its many advantages. But when faults occur, the style of fault and the operation condition are more complicated than that on the single circuit transmission line. The faults occurred on the transmission lines is mainly transient fault. The auto-reclosure is normally applied after the fault line tripped to improve the power supplies reliability and the power system safety. But if the fault is permanent and the auto-reclosure reclosed accordingly, the power system and its apparatus will suffer short circuit current again, resulting further damage of the equipment and making power system instability. Thus, it is very important to distinguish the transient and permanent fault before the tripped fault line auto-reclose. If the EHV line has shunt reactor, identification of fault nature becomes even more difficult. There are several methods proposed for distinguishing the transient and permanent fault but mainly for single circuit transmission line. In this paper, a novel method is proposed for the EHV double circuit transmission lines with shunt reactor. After tripped, the phase voltage across shunt reactor was calculated using our established transient fault line model regardless of the fault is transient or permanent. The difference between the calculated voltage and the measured voltage of the fault phase across shunt reactor was employed to identify transient or permanent fault. The amplitude ratio, i.e. the difference of the voltage between calculated and measured to the voltage across neutral reactor was used to judge fault nature. If the amplitude ratio is greater less than 1, the fault is regarded as transient. If it is more than 1, it is regarded as permanent. This result can be further verified by EMTP simulation.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126198544","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640818
J. Rama Rao, J. Amarnath, S. Kamakshaiah
The transient high frequency electric and magnetic fields are generated in Gas insulated substations(GIS) systems during switching operations by both radiation and conduction mechanisms. In this paper the radiated transient electric and magnetic fields are measured by using high frequency field sensors at important locations in the 245kV GIS were presented. The measurements are carried out at three important locations including at bus link, cable termination and C.T position respectively. The results of measured values are compared with the calculated values. The results shows that transient electric & magnetic field values are correlate with the measured values at bus link, near current transformer(CT)and at cable termination , the calculated values are slightly deviated from the measured values when moves along with XLPE cable. This may be due to a fast attenuation rate of electromagnetic fields with distance away from the DS3. These results are very useful in order to prepare some precautionary protection measure to avoid malfunctioning of secondary equipment and metering equipment in GIS systems.
{"title":"High frequency magnetic and electric field measurements and simulation of a 245kV GIS","authors":"J. Rama Rao, J. Amarnath, S. Kamakshaiah","doi":"10.1109/ICHVE.2010.5640818","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640818","url":null,"abstract":"The transient high frequency electric and magnetic fields are generated in Gas insulated substations(GIS) systems during switching operations by both radiation and conduction mechanisms. In this paper the radiated transient electric and magnetic fields are measured by using high frequency field sensors at important locations in the 245kV GIS were presented. The measurements are carried out at three important locations including at bus link, cable termination and C.T position respectively. The results of measured values are compared with the calculated values. The results shows that transient electric & magnetic field values are correlate with the measured values at bus link, near current transformer(CT)and at cable termination , the calculated values are slightly deviated from the measured values when moves along with XLPE cable. This may be due to a fast attenuation rate of electromagnetic fields with distance away from the DS3. These results are very useful in order to prepare some precautionary protection measure to avoid malfunctioning of secondary equipment and metering equipment in GIS systems.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126223089","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}
Y. Kieffel, A. Girodet, K. Pohlink, S. Bouti, D. Beauguitte
Improving the recyclability of the high voltage apparatus is a major concern of the manufacturers. In this paper, the suitability of thermoplastic polymer used as support insulator in high voltage gas insulated substation is presented in this paper. Among the possible candidates, a semi-crystalline thermoplastic polyethylene-terephtalate was selected and investigated in terms of the chemical structure and the morphology as well as the basic characteristics such as mechanical and electrical characteristics are reviewed for the virgin material. The effect of the temperature on the dielectric strength is also investigated. In view of extremely promising results, it is worthwhile studying the evolution of the material properties under operating conditions. In that sense, mechanical creepage curves are given. It is also shown that the main electrical properties of the material are affected neither by aging under used SF6 nor by combined thermo-electrical ageing. As an application, we present the manufacturing of plate insulator dedicated to the new 72.5 kV three phase F35 substation insulation.
{"title":"Suitability of thermoplastic polymer used as insulator for HV apparatuses","authors":"Y. Kieffel, A. Girodet, K. Pohlink, S. Bouti, D. Beauguitte","doi":"10.3166/EJEE.15.169-178","DOIUrl":"https://doi.org/10.3166/EJEE.15.169-178","url":null,"abstract":"Improving the recyclability of the high voltage apparatus is a major concern of the manufacturers. In this paper, the suitability of thermoplastic polymer used as support insulator in high voltage gas insulated substation is presented in this paper. Among the possible candidates, a semi-crystalline thermoplastic polyethylene-terephtalate was selected and investigated in terms of the chemical structure and the morphology as well as the basic characteristics such as mechanical and electrical characteristics are reviewed for the virgin material. The effect of the temperature on the dielectric strength is also investigated. In view of extremely promising results, it is worthwhile studying the evolution of the material properties under operating conditions. In that sense, mechanical creepage curves are given. It is also shown that the main electrical properties of the material are affected neither by aging under used SF6 nor by combined thermo-electrical ageing. As an application, we present the manufacturing of plate insulator dedicated to the new 72.5 kV three phase F35 substation insulation.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126355952","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640872
H. Kojima, Keiya Suzuki, H. Okubo, K. Kato
For environment-friendly vacuum interrupter (VI), higher voltage operation and more compactness are required. From this point of view, and to enhance the electrical insulation performance of VI, it is needed to introduce the field optimization techniques. In this paper, we propose a new optimization technique for electrode configuration with floating potential in VI. We applied this optimization technique to the edge configuration of center shield in VI with considering the arrangement of grounded tank. Consequently, the maximum electric field strength decreased to 70% of non-optimized shape. From the results, we verified the effectiveness of the proposed automatic numerical optimization technique for the improvement of the insulation performance in high voltage vacuum insulated equipment.
{"title":"Electric field optimization of floating electrode configuration in vacuum interrupter","authors":"H. Kojima, Keiya Suzuki, H. Okubo, K. Kato","doi":"10.1109/ICHVE.2010.5640872","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640872","url":null,"abstract":"For environment-friendly vacuum interrupter (VI), higher voltage operation and more compactness are required. From this point of view, and to enhance the electrical insulation performance of VI, it is needed to introduce the field optimization techniques. In this paper, we propose a new optimization technique for electrode configuration with floating potential in VI. We applied this optimization technique to the edge configuration of center shield in VI with considering the arrangement of grounded tank. Consequently, the maximum electric field strength decreased to 70% of non-optimized shape. From the results, we verified the effectiveness of the proposed automatic numerical optimization technique for the improvement of the insulation performance in high voltage vacuum insulated equipment.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122307602","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640866
T. Czaszejko, Shi Chen
Ultra-wide-band PD detection techniques have the capacity to enhance the amount of information obtained about the measured PD activity. The UWB method is not without its problems. The physical arrangement of the test circuit plays an important part in the response obtained. Despite this obvious dependency, the test circuit configuration is often not acknowledged in papers reporting UWB measurements. Therefore, it seemed appropriate to conduct a systematic study of the relationship between the arrangement of a typical PD test circuit, its electrical parameters and the resulting response in terms of the measured PD pulse waveforms. This paper describes some findings of this study.
{"title":"Ultra wide band response of partial discharge test circuit","authors":"T. Czaszejko, Shi Chen","doi":"10.1109/ICHVE.2010.5640866","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640866","url":null,"abstract":"Ultra-wide-band PD detection techniques have the capacity to enhance the amount of information obtained about the measured PD activity. The UWB method is not without its problems. The physical arrangement of the test circuit plays an important part in the response obtained. Despite this obvious dependency, the test circuit configuration is often not acknowledged in papers reporting UWB measurements. Therefore, it seemed appropriate to conduct a systematic study of the relationship between the arrangement of a typical PD test circuit, its electrical parameters and the resulting response in terms of the measured PD pulse waveforms. This paper describes some findings of this study.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114178163","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640733
H. Illias, George Chen, P. Lewin
Partial discharge (PD) activity is always linked to insulation degradation, which can affect the performance of the insulation. Therefore, measurement of PD events can be used to assess the condition of the insulation. To assist the assessment of the performance of insulation materials, modelling of PD events can be used to attain a better understanding of this phenomenon. In this paper, a Finite Element Analysis (FEA) model for simulation of PD activity within a spherical cavity in a homogeneous dielectric material has been developed. The model has been used to study the influence of amplitude of the applied voltage on PD activity. Through comparisons of simulation and measurement results, some parameter values in the model are seen to be dependent on the applied voltage amplitude.
{"title":"Measurement and modelling of partial discharge behaviour in a spherical cavity within a solid dielectric material as a function of applied voltage amplitude","authors":"H. Illias, George Chen, P. Lewin","doi":"10.1109/ICHVE.2010.5640733","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640733","url":null,"abstract":"Partial discharge (PD) activity is always linked to insulation degradation, which can affect the performance of the insulation. Therefore, measurement of PD events can be used to assess the condition of the insulation. To assist the assessment of the performance of insulation materials, modelling of PD events can be used to attain a better understanding of this phenomenon. In this paper, a Finite Element Analysis (FEA) model for simulation of PD activity within a spherical cavity in a homogeneous dielectric material has been developed. The model has been used to study the influence of amplitude of the applied voltage on PD activity. Through comparisons of simulation and measurement results, some parameter values in the model are seen to be dependent on the applied voltage amplitude.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121093868","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640774
Christoph Kuen
The lifespan of a transformer with oil-cellulose-insulation is, in the end, dependent upon the aging of the cellulose. While the insulating oil can be reprocessed or renewed, the aging of the cellulose is an irreversible process. The current condition of aged cellulose is described by the degree of polymerization (DP). When it is new, the insulating paper has a DP-value in the range of between 1000 and 1200. This value decreases over the course of time due to aging processes such as hydrolyses, pyrolysis and oxidation. A degree of polymerization of about 200 to 300 is regarded as the “Cend-of-life” of the paper. Aging models defined by engineering standards only refer to temperature and time as factors which impact the aging of cellulose. On the other hand, influential variables such as moisture, cellulose quality (kraft paper / thermally upgraded paper) and oxygen (air) are, as yet, not considered in these models. The water, in particular, accrued as part of the aging process splits up the cellulose chains of the solid insulation. The water content thus acts to continuously accelerate the aging process. In this paper, measured and calculated DP-time-trends of the cellulose are analyzed and compared. Furthermore ideas for an aging model with a new physical approach are presented.
{"title":"Analysis and comparison of aging-trends of cellulose for transformers with oil-cellulose-insulation","authors":"Christoph Kuen","doi":"10.1109/ICHVE.2010.5640774","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640774","url":null,"abstract":"The lifespan of a transformer with oil-cellulose-insulation is, in the end, dependent upon the aging of the cellulose. While the insulating oil can be reprocessed or renewed, the aging of the cellulose is an irreversible process. The current condition of aged cellulose is described by the degree of polymerization (DP). When it is new, the insulating paper has a DP-value in the range of between 1000 and 1200. This value decreases over the course of time due to aging processes such as hydrolyses, pyrolysis and oxidation. A degree of polymerization of about 200 to 300 is regarded as the “Cend-of-life” of the paper. Aging models defined by engineering standards only refer to temperature and time as factors which impact the aging of cellulose. On the other hand, influential variables such as moisture, cellulose quality (kraft paper / thermally upgraded paper) and oxygen (air) are, as yet, not considered in these models. The water, in particular, accrued as part of the aging process splits up the cellulose chains of the solid insulation. The water content thus acts to continuously accelerate the aging process. In this paper, measured and calculated DP-time-trends of the cellulose are analyzed and compared. Furthermore ideas for an aging model with a new physical approach are presented.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"23 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122468626","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640771
R. Włodek, J. Roehrich, P. Zydroń
The introduction of Adjustable/Variable Speed Drives (ASD/VSD) caused new exposures for motor insulation systems. Particularly the application of fast transistor switches and pulse-width modulated (PWM) train of pulses may result in the overvoltages on motor insulation. The mechanism of partial discharges in insulating system has been widely investigated for sinusoidal voltage shape. However, fast rising PWM pulses may result in another mechanism of partial discharges initiation and further evolution and thus the degradation of insulating material. The paper discuses the influence of PWM pulses shape on expected exposures on electric motor insulation. For this aim the voltage pulse shape may be represented generally as the trapezoidal one. Voltage pulse of such a shape is propagated through feeding cable to the motor insulation input. As the effect the time transient voltage response arises at this point and acts on the motor insulating system. The shape and value of such an overvoltage depend on the cable parameters, the equivalent impedance of the winding, and on the parameters of feeding voltage shape, i.e. the slope of voltage increase and decrease.
{"title":"Analysis of overvoltage on motor winding insulation fed by PWM pulses","authors":"R. Włodek, J. Roehrich, P. Zydroń","doi":"10.1109/ICHVE.2010.5640771","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640771","url":null,"abstract":"The introduction of Adjustable/Variable Speed Drives (ASD/VSD) caused new exposures for motor insulation systems. Particularly the application of fast transistor switches and pulse-width modulated (PWM) train of pulses may result in the overvoltages on motor insulation. The mechanism of partial discharges in insulating system has been widely investigated for sinusoidal voltage shape. However, fast rising PWM pulses may result in another mechanism of partial discharges initiation and further evolution and thus the degradation of insulating material. The paper discuses the influence of PWM pulses shape on expected exposures on electric motor insulation. For this aim the voltage pulse shape may be represented generally as the trapezoidal one. Voltage pulse of such a shape is propagated through feeding cable to the motor insulation input. As the effect the time transient voltage response arises at this point and acts on the motor insulating system. The shape and value of such an overvoltage depend on the cable parameters, the equivalent impedance of the winding, and on the parameters of feeding voltage shape, i.e. the slope of voltage increase and decrease.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132641119","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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