Pub Date : 2013-10-08DOI: 10.1109/ICSD.2013.6619766
M. Arnaout, T. Paulmier, B. Dirasen, L. Berquez, F. Baudoin, D. Payan
This paper deals with a new method of PEA signal processing used for space materials. The aim of this new approach of deconvolution technique is first to obtain a charge density with an optimized spatial resolution and second to have an estimated charge density without handle any parameters. This new method is compared with the current PEA signal processing widely developed in the literature. After a brief description of the both methods, an experimental comparison is realized with irradiated materials. Results show an enhancement of the spreading of charges at vicinity of electrodes.
{"title":"Description and experimental validation of a new PEA signal processing concept","authors":"M. Arnaout, T. Paulmier, B. Dirasen, L. Berquez, F. Baudoin, D. Payan","doi":"10.1109/ICSD.2013.6619766","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619766","url":null,"abstract":"This paper deals with a new method of PEA signal processing used for space materials. The aim of this new approach of deconvolution technique is first to obtain a charge density with an optimized spatial resolution and second to have an estimated charge density without handle any parameters. This new method is compared with the current PEA signal processing widely developed in the literature. After a brief description of the both methods, an experimental comparison is realized with irradiated materials. Results show an enhancement of the spreading of charges at vicinity of electrodes.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121784998","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619705
A. Beldjilali, M. Saidi, N. Saidi-Amroun
The aim of this work is to study, with a numerical simulation, the space charge dynamics in polymers, where a particular intent is accorded to the mobility parameter. Analysis of experimental transient charging current, with anomalous peak, under dc field, in polyethylene naphthalate, show that carriers mobility depends strongly on the temperature and weakly on applied field (probably due to its small range variation). The temperature dependence of the mobility follows an Arrhenius-like law, with apparent activation energy of 0.45 eV. From these experimental results, a model of space charge was considered, assuming Schottky injection at electrodes. Transient space-charge distributions, internal field profile and external charging current, were numerically simulated based on this model. It was shown that the space-charge dynamics depends upon the mobility of carriers.
{"title":"Simulation of space charge in polyethylene naphthalate: Effect of charge carrier mobility","authors":"A. Beldjilali, M. Saidi, N. Saidi-Amroun","doi":"10.1109/ICSD.2013.6619705","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619705","url":null,"abstract":"The aim of this work is to study, with a numerical simulation, the space charge dynamics in polymers, where a particular intent is accorded to the mobility parameter. Analysis of experimental transient charging current, with anomalous peak, under dc field, in polyethylene naphthalate, show that carriers mobility depends strongly on the temperature and weakly on applied field (probably due to its small range variation). The temperature dependence of the mobility follows an Arrhenius-like law, with apparent activation energy of 0.45 eV. From these experimental results, a model of space charge was considered, assuming Schottky injection at electrodes. Transient space-charge distributions, internal field profile and external charging current, were numerically simulated based on this model. It was shown that the space-charge dynamics depends upon the mobility of carriers.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115139549","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619750
A. Contin, G. Schena, D. Dreossi
The X-ray computed tomography has been applied here to inspect the internal features of two types of ground-wall insulation systems of ac rotating machines. Samples extracted from complete coils were scanned and their internal structure was analyzed by means of virtual slicing and 3D rendering procedures. Specialized software tools have been used to discover the morphological features of both the distributed voids and the high-density anomalies. It is was found that the resin penetration as well as the density and the geometries of the distributed microvoids depend from the tape characteristics.
{"title":"3D structural analysis of ground-wall insulation of AC rotating machines using X-ray tomography","authors":"A. Contin, G. Schena, D. Dreossi","doi":"10.1109/ICSD.2013.6619750","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619750","url":null,"abstract":"The X-ray computed tomography has been applied here to inspect the internal features of two types of ground-wall insulation systems of ac rotating machines. Samples extracted from complete coils were scanned and their internal structure was analyzed by means of virtual slicing and 3D rendering procedures. Specialized software tools have been used to discover the morphological features of both the distributed voids and the high-density anomalies. It is was found that the resin penetration as well as the density and the geometries of the distributed microvoids depend from the tape characteristics.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"103-B 7 Supple B 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115173701","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619762
Walid Boughamni, J. Manata, S. Ait-Amar, D. Roger
The aim of this paper is to compare electrical, mechanical and thermal characteristics of two self-bonding solutions to the impregnation one. An alternative solution is developed without Volatile Organic Compound (VOC). The study focuses on two parameters: the Partial Discharge Inception Voltage (PDIV) of turn-to-turn insulation and the thermal conductivity between the heart of the winding and the magnetic core. This study place the problem of electrical machines design in a broader context which includes the life cycle analysis, in order to go towards the eco-design of electrical machines able to reduce the global environmental footprint.
{"title":"Electrical machines insulation: Towards low environmental impact solutions","authors":"Walid Boughamni, J. Manata, S. Ait-Amar, D. Roger","doi":"10.1109/ICSD.2013.6619762","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619762","url":null,"abstract":"The aim of this paper is to compare electrical, mechanical and thermal characteristics of two self-bonding solutions to the impregnation one. An alternative solution is developed without Volatile Organic Compound (VOC). The study focuses on two parameters: the Partial Discharge Inception Voltage (PDIV) of turn-to-turn insulation and the thermal conductivity between the heart of the winding and the magnetic core. This study place the problem of electrical machines design in a broader context which includes the life cycle analysis, in order to go towards the eco-design of electrical machines able to reduce the global environmental footprint.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132700099","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619898
L. Zavattoni, O. Lesaint, O. Gallot-Lavallée, J. Reboud
The influence of water inside an insulating material (epoxy resin with Alumina filler) on volume resistivity, is investigated. This parameter is measured versus temperature. The water content within samples is adjusted using a climatic chamber, and monitored by weighing. Measurements show a large enhancement of volume conductivity versus water concentration and temperature. The impact of a temperature gradient, and of the presence of water on the field distribution and current through a high voltage insulator under HVDC is calculated. This is done by numerical simulation with simplified insulator geometry. The simulation includes the coupling between temperature distribution, resistivity versus temperature, and field distribution.
{"title":"Influence of water content and temperature on conduction and field on an Alumina/epoxy insulator","authors":"L. Zavattoni, O. Lesaint, O. Gallot-Lavallée, J. Reboud","doi":"10.1109/ICSD.2013.6619898","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619898","url":null,"abstract":"The influence of water inside an insulating material (epoxy resin with Alumina filler) on volume resistivity, is investigated. This parameter is measured versus temperature. The water content within samples is adjusted using a climatic chamber, and monitored by weighing. Measurements show a large enhancement of volume conductivity versus water concentration and temperature. The impact of a temperature gradient, and of the presence of water on the field distribution and current through a high voltage insulator under HVDC is calculated. This is done by numerical simulation with simplified insulator geometry. The simulation includes the coupling between temperature distribution, resistivity versus temperature, and field distribution.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133506408","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619768
I. Tsekmes, D. van der Born, P. Morshuis, J. J. Smit, T. J. Person, S. J. Sutton
Polymeric cables operating under high voltage direct current (HVDC), suffer from space charge accumulation and may exhibit a relatively low depletion rate of accumulated charges when the external field is removed. Increasing the reliability of polymeric dc cables is of crucial importance. The development of new polymeric materials with improved performance under dc electrical stresses requires a thorough investigation of the properties governing charge injection, transport and trapping. In this research, the space charge accumulation thresholds of three different polymeric dc minicables are examined with the use of space charge and conduction current measurements.
{"title":"Space charge accumulation in polymeric DC mini-cables","authors":"I. Tsekmes, D. van der Born, P. Morshuis, J. J. Smit, T. J. Person, S. J. Sutton","doi":"10.1109/ICSD.2013.6619768","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619768","url":null,"abstract":"Polymeric cables operating under high voltage direct current (HVDC), suffer from space charge accumulation and may exhibit a relatively low depletion rate of accumulated charges when the external field is removed. Increasing the reliability of polymeric dc cables is of crucial importance. The development of new polymeric materials with improved performance under dc electrical stresses requires a thorough investigation of the properties governing charge injection, transport and trapping. In this research, the space charge accumulation thresholds of three different polymeric dc minicables are examined with the use of space charge and conduction current measurements.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"155-156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122911761","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619708
S. Bouchareb, V. Griseri, L. Berquez
Material used in space aircraft are in contact with a large panel of charged particles. Dielectrics can store charges up to a certain extend above which electrostatic discharges might occur. To prevent these phenomena that can be harmful for the embarked electronic devices, the electrical behavior of those materials under irradiation must be studied. In the present case, we are only interested in the effect of electrons on dielectrics materials properties. To do so, an irradiation chamber has been equipped with various characterization tools to perform measurements in-situ. This work is focused on in situ space charge measurements by Pulse Electro Acoustic (PEA) technique and Laser Intensity Modulated Method (LIMM) during and post-irradiation. Experimental space charge distributions obtained by both techniques will be presented and discussed taking into account the measurement arrangements.
{"title":"In situ space charge profile measurements on electronic irradiated material by LIMM","authors":"S. Bouchareb, V. Griseri, L. Berquez","doi":"10.1109/ICSD.2013.6619708","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619708","url":null,"abstract":"Material used in space aircraft are in contact with a large panel of charged particles. Dielectrics can store charges up to a certain extend above which electrostatic discharges might occur. To prevent these phenomena that can be harmful for the embarked electronic devices, the electrical behavior of those materials under irradiation must be studied. In the present case, we are only interested in the effect of electrons on dielectrics materials properties. To do so, an irradiation chamber has been equipped with various characterization tools to perform measurements in-situ. This work is focused on in situ space charge measurements by Pulse Electro Acoustic (PEA) technique and Laser Intensity Modulated Method (LIMM) during and post-irradiation. Experimental space charge distributions obtained by both techniques will be presented and discussed taking into account the measurement arrangements.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124581720","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}
In power transformers, the main reason why insulation faults occur is that partial discharge (PD) produces insulation deterioration at the weakest point of the insulation structure and ultimately lead to insulation breakdown. The insulation defects exist in the form of electrical trees or carbon channels reduce the effective insulating distance. Take the opaqueness of pressboard into consideration, the carbon channels generated by PD can't be easily observed. Therefore, in this paper, tests based on inter-turn partial discharge model are conducted to study the development rules of oil-paper insulation material defects. Constant voltage application was adopted in this series of tests. High voltage of 40 kV is applied on the inter-turn electrode specimens for different time in different groups of tests. After test, insulation tapes are stripped from inter-turn electrodes layer by layer so as to observe the carbon channels clearly. Results indicate that the development process of the carbon channel can be roughly divided into three stages. Analysis of discharge feature reveals two different shapes of q-φ scatter diagrams, the shape of seeds and the shape of inverted tacks. The shape shown in scatter diagram could be used as effective criteria to diagnose the inter-turn insulation defects produced by partial discharge at later stage.
{"title":"Development rules of inter-turn partial discharge defects on oil-paper insulation","authors":"Jinqing Wei, Yangchun Cheng, Guangzhen Wang, Zhihai Rong, Changjin Diao, Xiao Tian","doi":"10.1109/ICSD.2013.6619715","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619715","url":null,"abstract":"In power transformers, the main reason why insulation faults occur is that partial discharge (PD) produces insulation deterioration at the weakest point of the insulation structure and ultimately lead to insulation breakdown. The insulation defects exist in the form of electrical trees or carbon channels reduce the effective insulating distance. Take the opaqueness of pressboard into consideration, the carbon channels generated by PD can't be easily observed. Therefore, in this paper, tests based on inter-turn partial discharge model are conducted to study the development rules of oil-paper insulation material defects. Constant voltage application was adopted in this series of tests. High voltage of 40 kV is applied on the inter-turn electrode specimens for different time in different groups of tests. After test, insulation tapes are stripped from inter-turn electrodes layer by layer so as to observe the carbon channels clearly. Results indicate that the development process of the carbon channel can be roughly divided into three stages. Analysis of discharge feature reveals two different shapes of q-φ scatter diagrams, the shape of seeds and the shape of inverted tacks. The shape shown in scatter diagram could be used as effective criteria to diagnose the inter-turn insulation defects produced by partial discharge at later stage.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132047860","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619662
Guochang Li, Shengtao Li, D. Min, N. Zhao, Yuanwei Zhu
In extra high voltage transmission systems, the accumulation of space charges in polymeric materials have an important influence on the aging and breakdown of power equipments. It has been reported that space charges are mainly determined by trap distribution. Therefore, it is important to understand the influence of trap depths on space charges accumulation in insulating material. In this paper, based on charge migration, trapping and detrapping processes, an unipolar charge transport model has been adopted. The influence of trap depths on space charge in low density polyethylene can be obtained through solving the charge continuity equation, Poisson equation and first order charge trapping/ detrapping dynamic equation. The calculation results show that the free electron density and trapped electron density decrease gradually with the increase of sample position. With the trap depth increases, the total number of trapped electrons also increases, but the total number of free electrons decreases gradually. When the trap depth is larger than 1.1 eV, the total number of space charges in material keeps an equilibrium value. This research provides a theoretical guidance for diagnosing aging degree of insulating equipments in the future.
{"title":"Influence of trap depths on space charge formation and accumulation characteristics in low density polyethylene","authors":"Guochang Li, Shengtao Li, D. Min, N. Zhao, Yuanwei Zhu","doi":"10.1109/ICSD.2013.6619662","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619662","url":null,"abstract":"In extra high voltage transmission systems, the accumulation of space charges in polymeric materials have an important influence on the aging and breakdown of power equipments. It has been reported that space charges are mainly determined by trap distribution. Therefore, it is important to understand the influence of trap depths on space charges accumulation in insulating material. In this paper, based on charge migration, trapping and detrapping processes, an unipolar charge transport model has been adopted. The influence of trap depths on space charge in low density polyethylene can be obtained through solving the charge continuity equation, Poisson equation and first order charge trapping/ detrapping dynamic equation. The calculation results show that the free electron density and trapped electron density decrease gradually with the increase of sample position. With the trap depth increases, the total number of trapped electrons also increases, but the total number of free electrons decreases gradually. When the trap depth is larger than 1.1 eV, the total number of space charges in material keeps an equilibrium value. This research provides a theoretical guidance for diagnosing aging degree of insulating equipments in the future.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"52 13","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132287334","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619836
M. Boselli, V. Colombo, E. Ghedini, M. Gherardi, R. Laurita, A. Liguori, P. Sanibondi, A. Stancampiano
The development of low temperature plasma sources operating at atmospheric pressure is opening a new world of possible biomedical applications. In order to attain uniform treatments and avoid localized temperature peaks, a diffused plasma condition is generally desirable for this kind of applications. In this study two different dielectric materials, borosilicate glass and polystyrene, are evaluated for the realization of a particular plasma source (PlasmaSkin) developed for dermatological treatments. The influence of the dielectric material on the characteristics of the generated plasma and on the temperature reached by the dielectric surface are studied by means of High Speed Imaging technique and fiber optic temperature sensors respectively. Results obtained provide useful insights for the determination of the best material for the development of a plasma source for dermatological applications.
{"title":"Study of the role of dielectric material in a dielectric barrier discharge (DBD) plasma source for dermatological applications","authors":"M. Boselli, V. Colombo, E. Ghedini, M. Gherardi, R. Laurita, A. Liguori, P. Sanibondi, A. Stancampiano","doi":"10.1109/ICSD.2013.6619836","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619836","url":null,"abstract":"The development of low temperature plasma sources operating at atmospheric pressure is opening a new world of possible biomedical applications. In order to attain uniform treatments and avoid localized temperature peaks, a diffused plasma condition is generally desirable for this kind of applications. In this study two different dielectric materials, borosilicate glass and polystyrene, are evaluated for the realization of a particular plasma source (PlasmaSkin) developed for dermatological treatments. The influence of the dielectric material on the characteristics of the generated plasma and on the temperature reached by the dielectric surface are studied by means of High Speed Imaging technique and fiber optic temperature sensors respectively. Results obtained provide useful insights for the determination of the best material for the development of a plasma source for dermatological applications.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131856922","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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