Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481073
M. J. da Silva, F. Pereira, J. F. Cordeiro, T. E. Lamas, C. G. dos Santos, T. K. Aoki, E. Faria, T. Hildinger
The ability of IEEE 1310–2012 test method to simulate the possible insulation aging mechanisms of a generator working under repetitive start-stops was studied. Real stator bars, previously aged under service by about 10,000 start-stops were characterized in the laboratory and then submitted to a limited number of thermal cycles according to IEEE 1310–2012 for comparison. The results suggest that a small number of lab thermal cycles is sufficient to create defects that did not exist in the bars aged solely under operation conditions. It is also found that the lab cycles tend to propagate the very few existing defects towards areas where such features were not present in the original condition, such as the inner portion of the stator core. Therefore, depending on how exactly the test results generated by IEEE 1310–2012 are interpreted, there is a risk that the final assessment of any set of tested bars/coils is partially influenced by such test artifacts.
{"title":"Facts and Artifacts from IEEE 1310-2012","authors":"M. J. da Silva, F. Pereira, J. F. Cordeiro, T. E. Lamas, C. G. dos Santos, T. K. Aoki, E. Faria, T. Hildinger","doi":"10.1109/EIC.2018.8481073","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481073","url":null,"abstract":"The ability of IEEE 1310–2012 test method to simulate the possible insulation aging mechanisms of a generator working under repetitive start-stops was studied. Real stator bars, previously aged under service by about 10,000 start-stops were characterized in the laboratory and then submitted to a limited number of thermal cycles according to IEEE 1310–2012 for comparison. The results suggest that a small number of lab thermal cycles is sufficient to create defects that did not exist in the bars aged solely under operation conditions. It is also found that the lab cycles tend to propagate the very few existing defects towards areas where such features were not present in the original condition, such as the inner portion of the stator core. Therefore, depending on how exactly the test results generated by IEEE 1310–2012 are interpreted, there is a risk that the final assessment of any set of tested bars/coils is partially influenced by such test artifacts.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128423040","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 : 2018-06-01DOI: 10.1109/EIC.2018.8480885
M. Dhotre, X. Ye, S. Kotilainen
During current interruption in the high voltage circuit breaker, the contacts are eroded due to high temperature in the arc zone. This may influence the lifetime of the breaker and even current interruption process. Although there are many parameters that influence contact erosion, the work presented in this paper focuses on the shape of the contact. The change in flow pattern due to the change in shape of the contact and its correlation with the erosion is presented. In addition to this, the contribution of the radiation and the convective heat flux has been quantified, and measures for reducing the contact erosion have been discussed.
{"title":"Contact Erosion in High Voltage Circuit Breakers","authors":"M. Dhotre, X. Ye, S. Kotilainen","doi":"10.1109/EIC.2018.8480885","DOIUrl":"https://doi.org/10.1109/EIC.2018.8480885","url":null,"abstract":"During current interruption in the high voltage circuit breaker, the contacts are eroded due to high temperature in the arc zone. This may influence the lifetime of the breaker and even current interruption process. Although there are many parameters that influence contact erosion, the work presented in this paper focuses on the shape of the contact. The change in flow pattern due to the change in shape of the contact and its correlation with the erosion is presented. In addition to this, the contribution of the radiation and the convective heat flux has been quantified, and measures for reducing the contact erosion have been discussed.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116847518","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481099
R. Rampersad, S. Bahadoorsingh, C. Sharma
Power Transformers are among the most critical assets in a power system, with significant costs as well as long lead times for acquisition. Their failure compromises the power system security. Total protection from electrical, mechanical, chemical and environmental stresses are near impossible leaving them vulnerable to failure via multiple mechanisms. Many researchers have analyzed the various failure mechanisms and have attempted to link specific mechanisms to the physical manifestations responsible for the ultimate failure of the transformer. This paper provides a library of failure frameworks in the various components of the transformer (core, windings, bushings, tank, cooling fins) and their link to the transformer dielectric materials (oil and cellulose). This paper will integrate published studies into a series of structured frameworks. Each framework provides a platform on which to develop improved models of plant reliability, identifying direct linkages between the transformer failure mechanisms and failure modes. With the identification of these linkages, reliability engineers can better understand how transformers fail and the measurands present at the time of failure, thus allowing for implementation of predictive/preventive maintenance regimes that shall be effective in identifying potential failure modes.
{"title":"Multifactorial Frameworks Modelling Linkages of Power Transformer Failure Modes","authors":"R. Rampersad, S. Bahadoorsingh, C. Sharma","doi":"10.1109/EIC.2018.8481099","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481099","url":null,"abstract":"Power Transformers are among the most critical assets in a power system, with significant costs as well as long lead times for acquisition. Their failure compromises the power system security. Total protection from electrical, mechanical, chemical and environmental stresses are near impossible leaving them vulnerable to failure via multiple mechanisms. Many researchers have analyzed the various failure mechanisms and have attempted to link specific mechanisms to the physical manifestations responsible for the ultimate failure of the transformer. This paper provides a library of failure frameworks in the various components of the transformer (core, windings, bushings, tank, cooling fins) and their link to the transformer dielectric materials (oil and cellulose). This paper will integrate published studies into a series of structured frameworks. Each framework provides a platform on which to develop improved models of plant reliability, identifying direct linkages between the transformer failure mechanisms and failure modes. With the identification of these linkages, reliability engineers can better understand how transformers fail and the measurands present at the time of failure, thus allowing for implementation of predictive/preventive maintenance regimes that shall be effective in identifying potential failure modes.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115704523","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481026
A. Contin, G. Peruzzi
The correlation between Dissipation Factor (DF) and Partial Discharge (PD) test results in the evaluation of the stator insulation of ac rotating machines, is discussed in this paper. It is well known that DF provides information on the global losses occurring in insulation systems but it does not provide any indication of the distribution of these losses. Above PD Inception Voltage (PDIV), increments of DF values are mainly due to PD in localized defects. Thanks to PD-signal separation and PD sub-pattern analysis, the causes of DF increments can be explained with more accuracy. Moreover, by comparing DF values recorded below the PDIV and PD patterns due to distributed micro-voids, the quality of the impregnation process in terms of void content, can be better evaluated. These results clearly show that the joint use of these two test methods can significantly improve the information on the conditions and the quality of the insulation system.
{"title":"Dissipation Factor and Partial Discharge Measurements for the Quality Assessment of New Coils and Stator Windings of VPI Rotating Machines","authors":"A. Contin, G. Peruzzi","doi":"10.1109/EIC.2018.8481026","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481026","url":null,"abstract":"The correlation between Dissipation Factor (DF) and Partial Discharge (PD) test results in the evaluation of the stator insulation of ac rotating machines, is discussed in this paper. It is well known that DF provides information on the global losses occurring in insulation systems but it does not provide any indication of the distribution of these losses. Above PD Inception Voltage (PDIV), increments of DF values are mainly due to PD in localized defects. Thanks to PD-signal separation and PD sub-pattern analysis, the causes of DF increments can be explained with more accuracy. Moreover, by comparing DF values recorded below the PDIV and PD patterns due to distributed micro-voids, the quality of the impregnation process in terms of void content, can be better evaluated. These results clearly show that the joint use of these two test methods can significantly improve the information on the conditions and the quality of the insulation system.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115730912","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481111
Feipeng Wang, Kelin Hu, Chunxiang Wan, Jian Li
Both the thermal faults and electrical faults may lead to hydrogen gas generation that dissolved in transformer oil. Diagnosis and early warning of transformer faults have been widely recognized by detecting the content change of dissolved hydrogen gas in the oil. This work aims to detect the change of hydrogen-gas content in transformer oil by using the surface acoustic wave (SAW) sensors. The sensing is recognized through the wavelength variation of SAW. The mass change of the sensitive layer due to the absorption of hydrogen-gas molecular is found to lead to significant changing of the SAW wavelength. By the controlled sputtering parameters, this work takes layer-structure optimized SnO2and Pd to build up the sensing layer. The hydrogen selectivity of Pd film, the sensitivity of the sensor is enhanced effectively by increasing the surface process of the bilayer sensitive film. The results indicate that the sensitivity of the processed sensor is 1.4 times as high as that before the processing.
{"title":"Hydrogen Gas Sensing in Transformer Oil by Surface Acoustic Wave Sensors","authors":"Feipeng Wang, Kelin Hu, Chunxiang Wan, Jian Li","doi":"10.1109/EIC.2018.8481111","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481111","url":null,"abstract":"Both the thermal faults and electrical faults may lead to hydrogen gas generation that dissolved in transformer oil. Diagnosis and early warning of transformer faults have been widely recognized by detecting the content change of dissolved hydrogen gas in the oil. This work aims to detect the change of hydrogen-gas content in transformer oil by using the surface acoustic wave (SAW) sensors. The sensing is recognized through the wavelength variation of SAW. The mass change of the sensitive layer due to the absorption of hydrogen-gas molecular is found to lead to significant changing of the SAW wavelength. By the controlled sputtering parameters, this work takes layer-structure optimized SnO2and Pd to build up the sensing layer. The hydrogen selectivity of Pd film, the sensitivity of the sensor is enhanced effectively by increasing the surface process of the bilayer sensitive film. The results indicate that the sensitivity of the processed sensor is 1.4 times as high as that before the processing.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128184327","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481116
Kangle Li, K. Zhou
In order to understand the influence of cable mechanical bending on the propagation of water trees, the propagation characteristics of water trees were compared in different bending degrees of XLPE cables. An accelerated water tree aging experiment was performed in unbended, smaller, and greater bending degree for XLPE cables respectively. After 28 days of aging, the three groups of samples were sliced, the morphologies of water trees were observed via an optical microscope, and the sizes of water trees were measured. Meanwhile, the experimental results were explained based on the mechanical orientation theory of XLPE materials. Optical microscope observation shows that with the increase in cable bending degree, water tree morphology changes from circular to cone on the outer side of the samples, and the difference between water tree length and width becomes larger. The greater the bending degree of cable, the water tree becomes wider than long. When the cable is bent to a certain extent, the local strain on the outer side of the insulation will exceed the yield strength of XLPE, which can cause the mechanical orientation of molecular chains. Once orientation occurs, the material will become anisotropic, along the orientation direction, water tree propagation will be promoted, while in the direction perpendicular to the orientation, water tree propagation will be inhibited, which further results in the formation of conical water trees.
{"title":"The Influence of Different Degrees of Mechanical Bending on Water Tree Propagation","authors":"Kangle Li, K. Zhou","doi":"10.1109/EIC.2018.8481116","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481116","url":null,"abstract":"In order to understand the influence of cable mechanical bending on the propagation of water trees, the propagation characteristics of water trees were compared in different bending degrees of XLPE cables. An accelerated water tree aging experiment was performed in unbended, smaller, and greater bending degree for XLPE cables respectively. After 28 days of aging, the three groups of samples were sliced, the morphologies of water trees were observed via an optical microscope, and the sizes of water trees were measured. Meanwhile, the experimental results were explained based on the mechanical orientation theory of XLPE materials. Optical microscope observation shows that with the increase in cable bending degree, water tree morphology changes from circular to cone on the outer side of the samples, and the difference between water tree length and width becomes larger. The greater the bending degree of cable, the water tree becomes wider than long. When the cable is bent to a certain extent, the local strain on the outer side of the insulation will exceed the yield strength of XLPE, which can cause the mechanical orientation of molecular chains. Once orientation occurs, the material will become anisotropic, along the orientation direction, water tree propagation will be promoted, while in the direction perpendicular to the orientation, water tree propagation will be inhibited, which further results in the formation of conical water trees.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121798294","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481076
D. Malec, D. Roger, S. Duchesne
The paper proposes a comparative approach of two insulation technologies of compact electric machines widely used in aeronautics. The first one is based on polymers that have limited working temperatures. The second one uses inorganic materials (vitro-ceramic layers and cements) able to withstand much higher temperatures. The comparison is based on a thermal equivalent circuit able to estimate the temperature of the main parts of the machine. The main weaknesses of inorganic coils are analyzed and solutions are proposed for designing coils able to operate in a high temperature compact permanent magnet synchronous motor.
{"title":"An Electrical Machine Made with Inorganic Rigid Coils: A Breakthrough Toward High Temperature Motors Designed for Aeronautics","authors":"D. Malec, D. Roger, S. Duchesne","doi":"10.1109/EIC.2018.8481076","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481076","url":null,"abstract":"The paper proposes a comparative approach of two insulation technologies of compact electric machines widely used in aeronautics. The first one is based on polymers that have limited working temperatures. The second one uses inorganic materials (vitro-ceramic layers and cements) able to withstand much higher temperatures. The comparison is based on a thermal equivalent circuit able to estimate the temperature of the main parts of the machine. The main weaknesses of inorganic coils are analyzed and solutions are proposed for designing coils able to operate in a high temperature compact permanent magnet synchronous motor.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131483117","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481068
Peng Zhang, B. Qi, Zhihai Rong, Yiming Wang, Chengrong Li, Yi Yang, Wenjie Zheng
The dissolved gas in oil is one of major state parameters of power transformers. The anomaly must be recognized before fault diagnose. However, data fluctuation and missing may cause anomaly recognition methods inapplicable. In this paper, a new method of abnormal state rapid identification of transformer is presented based on the Canopy model. The Canopy algorithm can determine the cluster number and cluster center position in the case of unknown state class, and has the advantages of small amount of calculation and fast convergence. This paper analyses the error of gases in oil detecting data and proposes the outlier recognition method based on the sliding window. Evaluation of data quality by the introducing fluctuation coefficient and variable weight high dimensional space is established. In the variable weight high dimensional space, the improved Canopy model is used to distinguish the state, and the abnormal event is used to identify the abnormal state. Compared with K-Means, the method improves the boundary data classification effect and reduces the computational complexity. With the variation tendency judgment, the anomaly state can be recognized. By testing with a not exceed standard practical cases, the method effectively recognized the overheat defect. And the method also does well in the threshold false alarm cases that caused by interference or poor data quality.
{"title":"Anomalous State Detection of Dissolved Gases in Transformer Oil Based on the Canopy Hyper Sphere Model","authors":"Peng Zhang, B. Qi, Zhihai Rong, Yiming Wang, Chengrong Li, Yi Yang, Wenjie Zheng","doi":"10.1109/EIC.2018.8481068","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481068","url":null,"abstract":"The dissolved gas in oil is one of major state parameters of power transformers. The anomaly must be recognized before fault diagnose. However, data fluctuation and missing may cause anomaly recognition methods inapplicable. In this paper, a new method of abnormal state rapid identification of transformer is presented based on the Canopy model. The Canopy algorithm can determine the cluster number and cluster center position in the case of unknown state class, and has the advantages of small amount of calculation and fast convergence. This paper analyses the error of gases in oil detecting data and proposes the outlier recognition method based on the sliding window. Evaluation of data quality by the introducing fluctuation coefficient and variable weight high dimensional space is established. In the variable weight high dimensional space, the improved Canopy model is used to distinguish the state, and the abnormal event is used to identify the abnormal state. Compared with K-Means, the method improves the boundary data classification effect and reduces the computational complexity. With the variation tendency judgment, the anomaly state can be recognized. By testing with a not exceed standard practical cases, the method effectively recognized the overheat defect. And the method also does well in the threshold false alarm cases that caused by interference or poor data quality.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128382032","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481071
B. Cella, A. Engler, R. De Maglie
The availability of an effective and reliable partial discharges (PD) sensing method gains importance for aerospace, as the tendency, to install more electrical power into the aircraft systems, comes along with higher voltages. Furthermore there is the requirement to detect PD in harsh EMI environments, which mainly reflects the increased use of power electronics. The presented paper describes a suitable approach for PD-detection, based on the adaptation of a capacitive coupler, which allows online and non-intrusive measurement even with PWM-operation of power electronics. The geometrical implications of the adapted sensors are outlined, based on several experiments with the focus on the signal-to-noise ratio. In order to ensure the relevance of the results, typical components of the aircraft, e.g. transformers and motors, have been taken into account. The validity of the new sensor's results has been assessed by comparison with standard PD-measurement equipment. Here, the limits of both approaches could be identified and conclusions for their application derived. The works done the last months have highlighted the different natures of some discharges, depending on the applied voltage. These natures have been identified by measuring the frequency content of the discharges. Obviously, the frequency characteristic of the PD-detection-method plays an important role. This paper describes the different types of discharges which have been measured and bring a description of their nature. The paper concludes with a discussion of the results. The advantages and drawbacks of the new sensor are given and a comparison with the old version is made. Finally, necessary future work is identified.
{"title":"On-Line Partial Discharges Sensing Method in Aeronautics for AC and PWM Voltages: Optimizations and Limitations","authors":"B. Cella, A. Engler, R. De Maglie","doi":"10.1109/EIC.2018.8481071","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481071","url":null,"abstract":"The availability of an effective and reliable partial discharges (PD) sensing method gains importance for aerospace, as the tendency, to install more electrical power into the aircraft systems, comes along with higher voltages. Furthermore there is the requirement to detect PD in harsh EMI environments, which mainly reflects the increased use of power electronics. The presented paper describes a suitable approach for PD-detection, based on the adaptation of a capacitive coupler, which allows online and non-intrusive measurement even with PWM-operation of power electronics. The geometrical implications of the adapted sensors are outlined, based on several experiments with the focus on the signal-to-noise ratio. In order to ensure the relevance of the results, typical components of the aircraft, e.g. transformers and motors, have been taken into account. The validity of the new sensor's results has been assessed by comparison with standard PD-measurement equipment. Here, the limits of both approaches could be identified and conclusions for their application derived. The works done the last months have highlighted the different natures of some discharges, depending on the applied voltage. These natures have been identified by measuring the frequency content of the discharges. Obviously, the frequency characteristic of the PD-detection-method plays an important role. This paper describes the different types of discharges which have been measured and bring a description of their nature. The paper concludes with a discussion of the results. The advantages and drawbacks of the new sensor are given and a comparison with the old version is made. Finally, necessary future work is identified.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133444371","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481045
J. Ramirez-Serrano, F. Espino-cortes, E. Hernández-Ramírez
PWM voltages modify the performance of the stress grading coatings at the end winding region of rotating machines. The electric field and heat in these layers become intensified under this type of waveforms. Under this condition, the design of the stress grading and the conductive armor coatings can become difficult and modeling has resulted in a useful tool in understanding the influence of the various design parameters. In this work, optical micrographs of the overlapping area are obtained from form-wound coils to observe the topology of the interface between conductive armor and stress grading tapes. The interface geometries observed in the images are used to simulate the electric field and heat under fast rise time pulses, and the results are compared with those obtained with the typical interface topology used in simulations.
{"title":"Electric Field and Heat at the CAT-SG Coatings Interface Under Fast Rise Pulses","authors":"J. Ramirez-Serrano, F. Espino-cortes, E. Hernández-Ramírez","doi":"10.1109/EIC.2018.8481045","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481045","url":null,"abstract":"PWM voltages modify the performance of the stress grading coatings at the end winding region of rotating machines. The electric field and heat in these layers become intensified under this type of waveforms. Under this condition, the design of the stress grading and the conductive armor coatings can become difficult and modeling has resulted in a useful tool in understanding the influence of the various design parameters. In this work, optical micrographs of the overlapping area are obtained from form-wound coils to observe the topology of the interface between conductive armor and stress grading tapes. The interface geometries observed in the images are used to simulate the electric field and heat under fast rise time pulses, and the results are compared with those obtained with the typical interface topology used in simulations.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122968063","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：