Pub Date : 2017-10-01DOI: 10.1049/OAP-CIRED.2017.0795
Y. Kieffel
Alternative solutions to SF6 have been researched for a long time. Up to now, no significant success has been achieved in solutions for the transmission network. This paper presents the research conducted with fluorinated compounds to qualify a new gas to be used into high voltage equipment as SF6 alternative with properties significantly improved with respect to typical SF6/N2 mixtures or others already in use. Potential applications of SF6-free gas mixture, called g3 and based on 3M™ Novec™ 4710 Dielectric Fluid for dielectric insulation and arc switching into high voltage apparatuses are reported with the aim to reduce the global warming potential of the new mixture to typically less than 2% of the SF6 equivalent with no or minor design modification with respect to typical SF6 design.
{"title":"Characteristics of g3 - an alternative to SF6","authors":"Y. Kieffel","doi":"10.1049/OAP-CIRED.2017.0795","DOIUrl":"https://doi.org/10.1049/OAP-CIRED.2017.0795","url":null,"abstract":"Alternative solutions to SF<sub>6</sub> have been researched for a long time. Up to now, no significant success has been achieved in solutions for the transmission network. This paper presents the research conducted with fluorinated compounds to qualify a new gas to be used into high voltage equipment as SF<sub>6</sub> alternative with properties significantly improved with respect to typical SF<sub>6</sub>/N<sub>2</sub> mixtures or others already in use. Potential applications of SF<sub>6</sub>-free gas mixture, called g<sup>3</sup> and based on 3M<sup>™</sup> Novec<sup>™</sup> 4710 Dielectric Fluid for dielectric insulation and arc switching into high voltage apparatuses are reported with the aim to reduce the global warming potential of the new mixture to typically less than 2% of the SF<sub>6</sub> equivalent with no or minor design modification with respect to typical SF<sub>6</sub> design.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130748362","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 : 2017-05-01DOI: 10.23919/INSUCON.2017.8097173
S. Basu, I. German, R. Rhodes, G. Stevens
Self-healing materials (SHMs) are capable of autonomously repairing minor damages, thereby restoring the pre-damage characteristics of the material. Such materials are of great interest for high-voltage assets, particularly those that are difficult or prohibitively expensive to access such as underground or subsea cables, transformers, and generator stators. In these systems, preventative maintenance is rarely possible so otherwise minor damage can progress, unchecked, to failure. At this stage, it become s necessary to repair or replace the affected component, which is time-consuming and expensive. Although SHMs can represent substantial savings to systems operators, their incorporation into existing equipment designs is not trivial. As well as conferring self-healing capabilities upon the asset in question, the SHMs must be capable of functioning under operational conditions and avoid corrupting critical material properties (e.g., mechanical strength, electrical breakdown strength, etc.). The self-healing mechanism itself must also be carefully considered, as many systems will only allow a single healing cycle, or be triggered by very specific environmental conditions. Here, we illustrate these challenges with a number of examples drawn from recent research activity on self-healing systems for both solid and fluid filled insulation, and demonstrate how self-healing mechanisms can be used to effect practical self-repair.
{"title":"Self-healing electrical insulation systems","authors":"S. Basu, I. German, R. Rhodes, G. Stevens","doi":"10.23919/INSUCON.2017.8097173","DOIUrl":"https://doi.org/10.23919/INSUCON.2017.8097173","url":null,"abstract":"Self-healing materials (SHMs) are capable of autonomously repairing minor damages, thereby restoring the pre-damage characteristics of the material. Such materials are of great interest for high-voltage assets, particularly those that are difficult or prohibitively expensive to access such as underground or subsea cables, transformers, and generator stators. In these systems, preventative maintenance is rarely possible so otherwise minor damage can progress, unchecked, to failure. At this stage, it become s necessary to repair or replace the affected component, which is time-consuming and expensive. Although SHMs can represent substantial savings to systems operators, their incorporation into existing equipment designs is not trivial. As well as conferring self-healing capabilities upon the asset in question, the SHMs must be capable of functioning under operational conditions and avoid corrupting critical material properties (e.g., mechanical strength, electrical breakdown strength, etc.). The self-healing mechanism itself must also be carefully considered, as many systems will only allow a single healing cycle, or be triggered by very specific environmental conditions. Here, we illustrate these challenges with a number of examples drawn from recent research activity on self-healing systems for both solid and fluid filled insulation, and demonstrate how self-healing mechanisms can be used to effect practical self-repair.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125864391","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 : 2016-08-23DOI: 10.1109/ICD.2016.7547718
Y. Gao, Y. Deng, B. Du, S. W. Li, N. Wang
Cross-linked polyethylene (XLPE) has been widely used as insulating material in power cable. Electrical tree formed within the XLPE has been considered as an important reason for the accelerated ageing and early breakdown of the insulation. From the viewpoint of safety, it is very necessary to gain a firm understanding of the nature of electrical treeing phenomena. In this paper, XLPE has been employed as test sample to investigate the influence of kHz-AC voltage on the treeing behavior. It has been found that bush trees are formed at such a high frequency range and the density of the tree appears to increase with the frequency, whereas the time to breakdown tends to decrease. It is suggested that partial discharge within the tree channel is strengthened with the frequency and thereby the deterioration of the material is accelerated.
{"title":"Electrical treeing behavior in XLPE under kHz-AC voltage","authors":"Y. Gao, Y. Deng, B. Du, S. W. Li, N. Wang","doi":"10.1109/ICD.2016.7547718","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547718","url":null,"abstract":"Cross-linked polyethylene (XLPE) has been widely used as insulating material in power cable. Electrical tree formed within the XLPE has been considered as an important reason for the accelerated ageing and early breakdown of the insulation. From the viewpoint of safety, it is very necessary to gain a firm understanding of the nature of electrical treeing phenomena. In this paper, XLPE has been employed as test sample to investigate the influence of kHz-AC voltage on the treeing behavior. It has been found that bush trees are formed at such a high frequency range and the density of the tree appears to increase with the frequency, whereas the time to breakdown tends to decrease. It is suggested that partial discharge within the tree channel is strengthened with the frequency and thereby the deterioration of the material is accelerated.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"185 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116320099","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 : 2016-08-23DOI: 10.1109/ICD.2016.7547826
O. Emelyanov, Pavel Kliuiko, M. Shemet
The first single partial discharges under ramp voltage are investigated in submillimetric air gaps and nonuniform field. Several polymer films with different thicknesses are used as a dielectric barrier: 12- and 100-μm polyethylene terephthalate films, 28-μm polyimide film, 6- and 12-μm polypropylene films. The inception voltage (breakdown voltage) and the discharge current are registered. The parameters of the accumulated surface charges measured by a rotating capacitive probe are presented. The surface charge patterns obtained by means of the dust figure method are shown. Probable mechanisms of the discharge development are discussed.
{"title":"Single partial discharge in nonuniform electric field for different polymer dielectrics","authors":"O. Emelyanov, Pavel Kliuiko, M. Shemet","doi":"10.1109/ICD.2016.7547826","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547826","url":null,"abstract":"The first single partial discharges under ramp voltage are investigated in submillimetric air gaps and nonuniform field. Several polymer films with different thicknesses are used as a dielectric barrier: 12- and 100-μm polyethylene terephthalate films, 28-μm polyimide film, 6- and 12-μm polypropylene films. The inception voltage (breakdown voltage) and the discharge current are registered. The parameters of the accumulated surface charges measured by a rotating capacitive probe are presented. The surface charge patterns obtained by means of the dust figure method are shown. Probable mechanisms of the discharge development are discussed.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116901744","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 : 2016-08-23DOI: 10.1109/ICD.2016.7547827
P. Trnka, J. Hornak, V. Mentlík, L. Harvánek, J. Pihera
The most commonly used insulating liquid is mineral oil. Mineral oil is characterized by high flammability and poor biodegradability. On the other hand, this oil has very good electrical properties. For reasons of environmental protection is an effort to replace the mineral oil by alternative insulating liquids. The vegetable or synthetic oils may be used as an alternative insulating liquid. The rapeseed oil is a suitable replacement for mineral oil in terms of dielectric properties, environmental friendliness, and financial costs. The main objective of this paper is to analyze the influence of solidification of rapeseed oil on its dielectrics parameters by dielectric spectroscopy measurement. The main emphasis is placed on the area near the pour point. The comparison of the dielectric strength of rapeseed oil in the liquid state and in the solid state is also part of this research.
{"title":"Behavior of alternative electro insulating liquid at solidification process","authors":"P. Trnka, J. Hornak, V. Mentlík, L. Harvánek, J. Pihera","doi":"10.1109/ICD.2016.7547827","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547827","url":null,"abstract":"The most commonly used insulating liquid is mineral oil. Mineral oil is characterized by high flammability and poor biodegradability. On the other hand, this oil has very good electrical properties. For reasons of environmental protection is an effort to replace the mineral oil by alternative insulating liquids. The vegetable or synthetic oils may be used as an alternative insulating liquid. The rapeseed oil is a suitable replacement for mineral oil in terms of dielectric properties, environmental friendliness, and financial costs. The main objective of this paper is to analyze the influence of solidification of rapeseed oil on its dielectrics parameters by dielectric spectroscopy measurement. The main emphasis is placed on the area near the pour point. The comparison of the dielectric strength of rapeseed oil in the liquid state and in the solid state is also part of this research.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117162767","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 : 2016-08-23DOI: 10.1080/00150193.2019.1683490
A. Leschhorn, H. Kliem
We develop a model to simulate the behavior of relaxors, e.g. their high permittivity in a broad temperature range. Our model is based on charges fluctuating thermally activated in intrinsically asymmetric double well potentials. The asymmetry is caused by disorder and can be modulated by a local field. The transition probabilities depend on the barrier height, the asymmetries of the double well potentials and on the local electric field. We use a mean local field which is the superposition of the applied field and a field proportional to the polarization due to the electrostatic interaction between the charges. In that way we get a feedback loop for the polarization. The dynamic permittivity is computed for systems of interacting charges in double well potentials with intrinsic asymmetry. The intrinsic asymmetry causes relaxor behavior: the permittivity as function of the temperature has a broad and high peak. The maximum of the permittivity decreases and is shifted to higher temperatures with increasing frequency.
{"title":"A feedback model for relaxors","authors":"A. Leschhorn, H. Kliem","doi":"10.1080/00150193.2019.1683490","DOIUrl":"https://doi.org/10.1080/00150193.2019.1683490","url":null,"abstract":"We develop a model to simulate the behavior of relaxors, e.g. their high permittivity in a broad temperature range. Our model is based on charges fluctuating thermally activated in intrinsically asymmetric double well potentials. The asymmetry is caused by disorder and can be modulated by a local field. The transition probabilities depend on the barrier height, the asymmetries of the double well potentials and on the local electric field. We use a mean local field which is the superposition of the applied field and a field proportional to the polarization due to the electrostatic interaction between the charges. In that way we get a feedback loop for the polarization. The dynamic permittivity is computed for systems of interacting charges in double well potentials with intrinsic asymmetry. The intrinsic asymmetry causes relaxor behavior: the permittivity as function of the temperature has a broad and high peak. The maximum of the permittivity decreases and is shifted to higher temperatures with increasing frequency.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128841472","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 : 2016-08-23DOI: 10.1109/ICD.2016.7547712
C. Peter, H. Kliem
Imprint effects are studied in Poly(vinylidenefluoride-trifluoroethylene) (P(VDF-TrFE)) metal-ferroelectric-metal (MFM)-capacitors. Imprint refers to a degradation mechanism in ferroelectrics which is found to take place on a logarithmic time scale. We present that the displacement of the polarization hysteresis loop along the voltage axis, the switching time, the polarization and the capacitance altogether change linearly as a function of the logarithm of time elapsed after poling. This suggests that these can be denoted as direct or indirect imprint effects. Furthermore by normalizing the capacitance and the coercive voltage, all values were found to change independently of thickness. This indicates that imprint is caused by mechanisms in the bulk. In a second experimental section we present that the two frequently used models to explain imprint in P(VDF-TrFE), i.e. the space charge model and the dead layer model are not consistent with our experimental findings.
{"title":"Imprint in Poly(vinylidenefluoride-trifluoroethylene)","authors":"C. Peter, H. Kliem","doi":"10.1109/ICD.2016.7547712","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547712","url":null,"abstract":"Imprint effects are studied in Poly(vinylidenefluoride-trifluoroethylene) (P(VDF-TrFE)) metal-ferroelectric-metal (MFM)-capacitors. Imprint refers to a degradation mechanism in ferroelectrics which is found to take place on a logarithmic time scale. We present that the displacement of the polarization hysteresis loop along the voltage axis, the switching time, the polarization and the capacitance altogether change linearly as a function of the logarithm of time elapsed after poling. This suggests that these can be denoted as direct or indirect imprint effects. Furthermore by normalizing the capacitance and the coercive voltage, all values were found to change independently of thickness. This indicates that imprint is caused by mechanisms in the bulk. In a second experimental section we present that the two frequently used models to explain imprint in P(VDF-TrFE), i.e. the space charge model and the dead layer model are not consistent with our experimental findings.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125609549","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 : 2016-08-23DOI: 10.1109/ICD.2016.7547662
Lijun Jin, Jianyong Ai, Zhiren Tian, K. Gao, Hua Huang
The insulators' pollution flashover will cause huge economic losses. But at present, there is no non-contact method with high accuracy to detect the pollution state of insulators. This paper aims to realize the non-contact online detection of the pollution state on the surface of the insulators, by researching on multi-source imaging methods, including visible imaging, infrared imaging and ultraviolet imaging. The insulators were polluted according to the IEC standard, and the visible images of the polluted insulators were obtained to find the features of the images. After that, the polluted insulators were tested with their working voltage. At the same time, both the infrared images and ultraviolet images were shot, in order to get the features of the images and the relationship between the features and the pollution state of insulators. Finally, a BP neural network was set up, fused by the three kinds of imaging detection methods, and an accuracy test was conducted. Before the fusion, the accuracy of every one of the three imaging detecting method was no more than 85%. However, after the fusion, the accuracy of multi- source imaging detection rose to 90% and the incorrect detection disappeared.
{"title":"Pollution state detection of insulators based on multisource imaging and information fusion","authors":"Lijun Jin, Jianyong Ai, Zhiren Tian, K. Gao, Hua Huang","doi":"10.1109/ICD.2016.7547662","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547662","url":null,"abstract":"The insulators' pollution flashover will cause huge economic losses. But at present, there is no non-contact method with high accuracy to detect the pollution state of insulators. This paper aims to realize the non-contact online detection of the pollution state on the surface of the insulators, by researching on multi-source imaging methods, including visible imaging, infrared imaging and ultraviolet imaging. The insulators were polluted according to the IEC standard, and the visible images of the polluted insulators were obtained to find the features of the images. After that, the polluted insulators were tested with their working voltage. At the same time, both the infrared images and ultraviolet images were shot, in order to get the features of the images and the relationship between the features and the pollution state of insulators. Finally, a BP neural network was set up, fused by the three kinds of imaging detection methods, and an accuracy test was conducted. Before the fusion, the accuracy of every one of the three imaging detecting method was no more than 85%. However, after the fusion, the accuracy of multi- source imaging detection rose to 90% and the incorrect detection disappeared.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134014463","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 : 2016-08-23DOI: 10.1109/ICD.2016.7547633
A. Staubach, H. Hirsch, G. Schmidt, F. Pohlmann
In large rotating machines the insulation system is extended by a field grading systems to provide an optimal electrical field distribution in the main insulation. In this study the anisotropic electrical material properties of the Outer Corona Protection (OCP) field grading system are analyzed. By modeling real OCP test samples and subsequent numeric calculation the systems field properties are characterized. Due to the consideration of complex spatial substructures, like the overlapping tape layers in the examined field grading system, the local field distributions will lead to an optimization of OCP resistivity configurations.
{"title":"Examination of anisotropic material characteristics in Outer Corona Protection (OCP) systems in large rotating machines","authors":"A. Staubach, H. Hirsch, G. Schmidt, F. Pohlmann","doi":"10.1109/ICD.2016.7547633","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547633","url":null,"abstract":"In large rotating machines the insulation system is extended by a field grading systems to provide an optimal electrical field distribution in the main insulation. In this study the anisotropic electrical material properties of the Outer Corona Protection (OCP) field grading system are analyzed. By modeling real OCP test samples and subsequent numeric calculation the systems field properties are characterized. Due to the consideration of complex spatial substructures, like the overlapping tape layers in the examined field grading system, the local field distributions will lead to an optimization of OCP resistivity configurations.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"329 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132817440","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 : 2016-08-23DOI: 10.1109/ICD.2016.7547643
A. Contin, A. Cavallini, A. Piccolo
Different types of Partial Discharge (PD) patterns have been proposed in the past to synthesize the information provided by thousand PD-pulse signals recorded during a measurement session. The efficiency in defect identification of each pattern type has been singularly verified but less work has been done to compare their performances. For this purpose, four types of PD patters have been evaluated in the identification of PD occurring in micro-voids distributed within the ground-wall insulation of new bars and coils for rotating machines. This choice is motivated by the rapid changes in PD activity during the transition from initial to steady-state conditions of the discharges within the voids. It was found that, despite some shape modifications, the Phase Resolved PD pattern provides the most effective identification among the four patterns considered in this investigation.
{"title":"Comparison of different PD patterns derived from tests on new coils for induction machines","authors":"A. Contin, A. Cavallini, A. Piccolo","doi":"10.1109/ICD.2016.7547643","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547643","url":null,"abstract":"Different types of Partial Discharge (PD) patterns have been proposed in the past to synthesize the information provided by thousand PD-pulse signals recorded during a measurement session. The efficiency in defect identification of each pattern type has been singularly verified but less work has been done to compare their performances. For this purpose, four types of PD patters have been evaluated in the identification of PD occurring in micro-voids distributed within the ground-wall insulation of new bars and coils for rotating machines. This choice is motivated by the rapid changes in PD activity during the transition from initial to steady-state conditions of the discharges within the voids. It was found that, despite some shape modifications, the Phase Resolved PD pattern provides the most effective identification among the four patterns considered in this investigation.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124801275","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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