Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772916
Z. A. Tamus, R. Cselkó, I. Berta
Many diagnostic methods have been developed for medium and high voltage cables, but the application of these methods for low voltage cables is limited. Usually, the testing voltage is much higher than the nominal voltage of low voltage cables therefore the testing object is exposed to voltage stress. By the results of authors, the diagnostic parameters can be affected on the voltage stress [1]. The partial discharge (PD) measurement is widely used method for fault detection of PE insulated medium voltage cables. The application of PD measurement for low voltage PE cables was examined by thermally and electrically aged specimens in this paper.
{"title":"Partial Discharge Measurement in Low Voltage Cable Diagnostics","authors":"Z. A. Tamus, R. Cselkó, I. Berta","doi":"10.1109/CEIDP.2008.4772916","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772916","url":null,"abstract":"Many diagnostic methods have been developed for medium and high voltage cables, but the application of these methods for low voltage cables is limited. Usually, the testing voltage is much higher than the nominal voltage of low voltage cables therefore the testing object is exposed to voltage stress. By the results of authors, the diagnostic parameters can be affected on the voltage stress [1]. The partial discharge (PD) measurement is widely used method for fault detection of PE insulated medium voltage cables. The application of PD measurement for low voltage PE cables was examined by thermally and electrically aged specimens in this paper.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73687617","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772901
J. Ramirez, J. Sanz, E. da Silva, M. Martínez, J. Rodriguez
In this paper the space charge distribution profile along the thickness of tree-retardant crosslinked polyethylene (TR-XLPE) cables, commonly used in medium voltage system and degraded under multiple factors as temperature, AC and impulse voltages are presented. A comparison of the space charge distribution along the insulation thickness (radial direction) of samples extracted from 15 kV TR-XLPE cables, 2 AWG Cu conductor, manufactured under dry curing process was done. Two 7 m long cable samples were submitted to accelerated ageing; one sample was under thermal stress and the other was under electrothermal factors combining thermal cycles with 25 kV AC voltage applied continuously and impulse voltage transients. Looking at the results it can be concluded that after the first thermal cycle the space charge is reduced in comparison with the profile of the new sample. This confirms that crosslink by-products are expelled under thermal treatments. The space charge density is higher in the central region of the insulator thickness of the new sample and aged samples as well. It is also evident that the electrothermal ageing cycle is more severe because it releases more quantity of space charge along the insulation thickness than the thermal one.
{"title":"Space Charge Profile of TR-XLPE Cables Aged Under Multiple Stresses","authors":"J. Ramirez, J. Sanz, E. da Silva, M. Martínez, J. Rodriguez","doi":"10.1109/CEIDP.2008.4772901","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772901","url":null,"abstract":"In this paper the space charge distribution profile along the thickness of tree-retardant crosslinked polyethylene (TR-XLPE) cables, commonly used in medium voltage system and degraded under multiple factors as temperature, AC and impulse voltages are presented. A comparison of the space charge distribution along the insulation thickness (radial direction) of samples extracted from 15 kV TR-XLPE cables, 2 AWG Cu conductor, manufactured under dry curing process was done. Two 7 m long cable samples were submitted to accelerated ageing; one sample was under thermal stress and the other was under electrothermal factors combining thermal cycles with 25 kV AC voltage applied continuously and impulse voltage transients. Looking at the results it can be concluded that after the first thermal cycle the space charge is reduced in comparison with the profile of the new sample. This confirms that crosslink by-products are expelled under thermal treatments. The space charge density is higher in the central region of the insulator thickness of the new sample and aged samples as well. It is also evident that the electrothermal ageing cycle is more severe because it releases more quantity of space charge along the insulation thickness than the thermal one.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83836203","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772912
Wei Wang, Bing An, Chengrong Li, B. Luo, Xiaolin Li, Yixu Wang, Fei Fan, Boo-gen Yang
To research the effect of temperature and humidity on radio interference generated from UHV DC transmission lines, a mini corona cage has been constructed and put in a manual environment room, which temperature and humidity can be controlled. At the same time, a radio interference performance measuring system by using loop method has been set up too. The radio interference generated from a copper line have been measured in a mini corona cage not only at different humidity from 30% to 99% at 20 but also at different temperature from 0 to 30. The relationship between radio interference level and temperature and humidity have been achieved.
{"title":"The Effect of Temperature and Humidity on Radio Interference Generated from UHV DC Transmission Lines","authors":"Wei Wang, Bing An, Chengrong Li, B. Luo, Xiaolin Li, Yixu Wang, Fei Fan, Boo-gen Yang","doi":"10.1109/CEIDP.2008.4772912","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772912","url":null,"abstract":"To research the effect of temperature and humidity on radio interference generated from UHV DC transmission lines, a mini corona cage has been constructed and put in a manual environment room, which temperature and humidity can be controlled. At the same time, a radio interference performance measuring system by using loop method has been set up too. The radio interference generated from a copper line have been measured in a mini corona cage not only at different humidity from 30% to 99% at 20 but also at different temperature from 0 to 30. The relationship between radio interference level and temperature and humidity have been achieved.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83077289","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772897
K. Haji, D. Shiibara, Y. Arata, T. Sakoda, M. Otsubo
This paper describes the results of experiments made to examine characteristics of hydrophobicity of ATH-filled silicone rubber specimen surface. As the examination method, we used a dynamic drop test (DDT), in which electrolyte solution droplet from an electrode continuously dropped on a sample and the AC voltage was supplied between electrodes. Hydrophobicity loss times of samples for various conductivities of electrolyte solutions were measured. The electric fields before and after hydrophobicity reduction were evaluated. The results showed that the hydrophobicity loss time became short with the increase of conductivity and the electric field increased after hydrophobicity reduction.
本文介绍了对ath填充硅橡胶试样表面疏水性特性进行研究的实验结果。我们采用了动态滴落试验(dynamic drop test, DDT)作为检测方法，即电极上的电解质溶液滴在样品上连续滴下，并在电极之间提供交流电压。测定了不同电导率的电解质溶液样品的疏水性损失次数。对疏水还原前后的电场进行了评价。结果表明，随着电导率的增加，疏水性损失时间变短，疏水性降低后电场增大。
{"title":"Characteristics evaluation of the Partial Arc Discharge and the Silicone Rubber surface by Dynamic Drop Test","authors":"K. Haji, D. Shiibara, Y. Arata, T. Sakoda, M. Otsubo","doi":"10.1109/CEIDP.2008.4772897","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772897","url":null,"abstract":"This paper describes the results of experiments made to examine characteristics of hydrophobicity of ATH-filled silicone rubber specimen surface. As the examination method, we used a dynamic drop test (DDT), in which electrolyte solution droplet from an electrode continuously dropped on a sample and the AC voltage was supplied between electrodes. Hydrophobicity loss times of samples for various conductivities of electrolyte solutions were measured. The electric fields before and after hydrophobicity reduction were evaluated. The results showed that the hydrophobicity loss time became short with the increase of conductivity and the electric field increased after hydrophobicity reduction.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90445479","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772940
K. Koppisetty, H. Kirkici
Partial discharges and corona are generally considered as unwanted processes in power systems as they are constant source of power loss and electrical noise (EMI). These effects can further develop into a major problem at the component level, causing insulation deterioration and component failure leading to possible electrical breakdown. The availability of switching power supplies operating at higher intermediate frequencies makes it important to consider the effects of higher operating frequencies on corona and gas breakdown in partial vacuum conditions. This work presents the breakdown characteristics of argon and argon-nitrogen / helium-nitrogen mixtures in partial vacuum conditions subject to unipolar electric fields at 20 kHz. Results of breakdown events are discussed and compared with the results of helium breakdown under similar conditions. This work also presents results of various energy transitions in argon, argon-nitrogen, and helium-nitrogen mixtures as observed from the spectra collected during the breakdown events under unipolar pulsed voltages. These studies provide initial findings on the differences in breakdown behavior between atomic and diatomic excitation processes under unipolar-repetitive pulsed fields in kHz range.
{"title":"Optical Emission Characteristics of Electric Discharges in Helium, Argon-Nitrogen Mixtures Under High Frequency Unipolar Voltages","authors":"K. Koppisetty, H. Kirkici","doi":"10.1109/CEIDP.2008.4772940","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772940","url":null,"abstract":"Partial discharges and corona are generally considered as unwanted processes in power systems as they are constant source of power loss and electrical noise (EMI). These effects can further develop into a major problem at the component level, causing insulation deterioration and component failure leading to possible electrical breakdown. The availability of switching power supplies operating at higher intermediate frequencies makes it important to consider the effects of higher operating frequencies on corona and gas breakdown in partial vacuum conditions. This work presents the breakdown characteristics of argon and argon-nitrogen / helium-nitrogen mixtures in partial vacuum conditions subject to unipolar electric fields at 20 kHz. Results of breakdown events are discussed and compared with the results of helium breakdown under similar conditions. This work also presents results of various energy transitions in argon, argon-nitrogen, and helium-nitrogen mixtures as observed from the spectra collected during the breakdown events under unipolar pulsed voltages. These studies provide initial findings on the differences in breakdown behavior between atomic and diatomic excitation processes under unipolar-repetitive pulsed fields in kHz range.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75223204","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772831
L. Hui, R.C. Smith, X. Wang, J. K. Nelson, L. Schadler
Quality control has demanded methods to quantify the mixing state of nanoparticles imbedded in polymeric materials. Several quantification methods are reviewed based on the analysis of images from electron microscopy. This includes the quadrat-based skewness, nearest neighbor distance, the k-function and Monte Carlo method. A novel method in which the dispersion and distribution are evaluated respectively through aspects of the equivalent radius deviation and the distance between the gravity centers of particles or clusters is proposed. The efficacy of the method suggested is illustrated by the analysis of transmission electron microscopy (TEM) images of untreated and vinyl-silane treated 12.5 wt% nano-silica/XLPE. It is shown that the combined method provides complete information on the state of the composite, and is the most direct and convenient methodology.
{"title":"Quantification of Particulate Mixing in Nanocomposites","authors":"L. Hui, R.C. Smith, X. Wang, J. K. Nelson, L. Schadler","doi":"10.1109/CEIDP.2008.4772831","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772831","url":null,"abstract":"Quality control has demanded methods to quantify the mixing state of nanoparticles imbedded in polymeric materials. Several quantification methods are reviewed based on the analysis of images from electron microscopy. This includes the quadrat-based skewness, nearest neighbor distance, the k-function and Monte Carlo method. A novel method in which the dispersion and distribution are evaluated respectively through aspects of the equivalent radius deviation and the distance between the gravity centers of particles or clusters is proposed. The efficacy of the method suggested is illustrated by the analysis of transmission electron microscopy (TEM) images of untreated and vinyl-silane treated 12.5 wt% nano-silica/XLPE. It is shown that the combined method provides complete information on the state of the composite, and is the most direct and convenient methodology.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85814375","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772902
J. Ramirez, E. da Silva, J.C. Rodriguez, M. Martínez
Experience of polymer insulators used in transmission lines has now existed for almost 50 years and are widely used by many electricity companies around the world. Their superior performance under high pollution levels, as a consequence of their hydrophobic surface property, constitutes one of most important advantages. Lightweight, low maintenance cost and resistance to vandalism are also additional advantages of the composite insulators use. A first diagnosis, which includes a complete scheme of electrical, mechanical and physicochemical tests, was performed on 400 kV silicone rubber insulators removed after five years in service in the North/East region of Venezuela. The purpose of this paper is to present a summary of the visual inspection and main electric tests results. Having a short time in operation the insulator surface analysis gives information about the early aging period characteristics where the hydrophobicity can be still recovered. New studies would be planned in the future to find the degradation rate of the polymer insulators at this transmission line.
{"title":"Evaluation of 400 kV Silicone Insulators Aged under Natural Tropical Conditions","authors":"J. Ramirez, E. da Silva, J.C. Rodriguez, M. Martínez","doi":"10.1109/CEIDP.2008.4772902","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772902","url":null,"abstract":"Experience of polymer insulators used in transmission lines has now existed for almost 50 years and are widely used by many electricity companies around the world. Their superior performance under high pollution levels, as a consequence of their hydrophobic surface property, constitutes one of most important advantages. Lightweight, low maintenance cost and resistance to vandalism are also additional advantages of the composite insulators use. A first diagnosis, which includes a complete scheme of electrical, mechanical and physicochemical tests, was performed on 400 kV silicone rubber insulators removed after five years in service in the North/East region of Venezuela. The purpose of this paper is to present a summary of the visual inspection and main electric tests results. Having a short time in operation the insulator surface analysis gives information about the early aging period characteristics where the hydrophobicity can be still recovered. New studies would be planned in the future to find the degradation rate of the polymer insulators at this transmission line.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90843809","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772905
Florin Ciuprina, I. Pleșa, P. Notingher, T. Tudorache, D. Panaitescu
One of the main targets of the research in the field of polymer nanocomposite dielectrics is to obtain new materials with improved dielectric properties (resistivity, dielectric strength, permittivity and dielectric losses). In this paper the variation of the real part of the permittivity and of the loss tangent with the frequency are investigated for three formulations of nanocomposites obtained from polyethylene filled with nanoparticles of SiO2, TiO2 and Al2O3, respectively. The influence of the filler concentration (between 2 and 10 wt%) on the dielectric behavior of the nanocomposite is analyzed as well. To simulate the electrical behavior of the polymer-filler interface which might explain the experimental results a 3D electrostatic model proposed on the basis of Tanaka's multi-core model is discussed. This model allows one to study the influence of several parameters such as the nanoparticle diameter, thickness of the interface layers, concentration and permittivity of the nanoparticles or the permittivities of the interface layers, on the effective permittivity of a plane nanodielectric sample.
{"title":"Dielectric Properties of Nanodielectrics with Inorganic Fillers","authors":"Florin Ciuprina, I. Pleșa, P. Notingher, T. Tudorache, D. Panaitescu","doi":"10.1109/CEIDP.2008.4772905","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772905","url":null,"abstract":"One of the main targets of the research in the field of polymer nanocomposite dielectrics is to obtain new materials with improved dielectric properties (resistivity, dielectric strength, permittivity and dielectric losses). In this paper the variation of the real part of the permittivity and of the loss tangent with the frequency are investigated for three formulations of nanocomposites obtained from polyethylene filled with nanoparticles of SiO2, TiO2 and Al2O3, respectively. The influence of the filler concentration (between 2 and 10 wt%) on the dielectric behavior of the nanocomposite is analyzed as well. To simulate the electrical behavior of the polymer-filler interface which might explain the experimental results a 3D electrostatic model proposed on the basis of Tanaka's multi-core model is discussed. This model allows one to study the influence of several parameters such as the nanoparticle diameter, thickness of the interface layers, concentration and permittivity of the nanoparticles or the permittivities of the interface layers, on the effective permittivity of a plane nanodielectric sample.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90884641","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772778
Chao Zhang, J. Kučera, R. Kaluzny
Solid-insulated distribution equipment has several design advantages when considering benefits for environmental protection, maintenance-free operation, compact-design, light weight etc. In such equipment, interfaces between different solid insulating materials are generally inevitable. The interface, depending on the placement in the equipment, is not only subjected to high electric field stress perpendicular to the interface but also to electric field stress parallel to the interface. It is therefore very important to achieve an interface with robust electrical performance in both directions. In this paper, the electrical properties of the interface subjected to the parallel electric field have been investigated. Two different types of interface samples were intentionally chosen: one composed of silicone rubber and EPDM rubber - a soft-soft type interface and the other composed of silicone rubber and fiber reinforced epoxy resin - a soft-hard type interface. Samples were evaluated for leakage current and electrical breakdown behaviors. The purpose of the research is to determine if there is a significant difference in electrical performances between the two types of interface samples accordingly. The results have been discussed.
{"title":"The Electrical Behaviors of the Interface in Solid-Insulated Distribution Equipments","authors":"Chao Zhang, J. Kučera, R. Kaluzny","doi":"10.1109/CEIDP.2008.4772778","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772778","url":null,"abstract":"Solid-insulated distribution equipment has several design advantages when considering benefits for environmental protection, maintenance-free operation, compact-design, light weight etc. In such equipment, interfaces between different solid insulating materials are generally inevitable. The interface, depending on the placement in the equipment, is not only subjected to high electric field stress perpendicular to the interface but also to electric field stress parallel to the interface. It is therefore very important to achieve an interface with robust electrical performance in both directions. In this paper, the electrical properties of the interface subjected to the parallel electric field have been investigated. Two different types of interface samples were intentionally chosen: one composed of silicone rubber and EPDM rubber - a soft-soft type interface and the other composed of silicone rubber and fiber reinforced epoxy resin - a soft-hard type interface. Samples were evaluated for leakage current and electrical breakdown behaviors. The purpose of the research is to determine if there is a significant difference in electrical performances between the two types of interface samples accordingly. The results have been discussed.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91317167","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772784
N. Fuse, H. Sato, T. Tanaka, Y. Ohki
Effects of nanofiller loading on the carrier transport and molecular motion in polyamide-6/mica nanocomposites were discussed by analyzing their complex permittivity spectra. As a result, the following four dielectric polarization processes were observed; space charge polarization, alpha relaxation due to dipolar orientation, and beta relaxation due to rotation of amide groups bonded with water molecules, in addition to interfacial polarization at crystalline/amorphous boundaries. The enhancement of dielectric constant and that of loss factor due to abundance of mobile charge carriers are suppressed by the nanofiller loading. These results suggest that carrier transport is suppressed by the nanofillers. Furthermore, it was found that relaxation time becomes longer by the mica nanofiller loading both for the dipolar orientation and for the rotation of amide groups. Molecular motion is considered to be restricted in nanocomposites, which indicates a strong interaction between the resin and filler.
{"title":"Effects of Mica Nanofillers on the Complex Permittivity of Polyamide Nanocomposites","authors":"N. Fuse, H. Sato, T. Tanaka, Y. Ohki","doi":"10.1109/CEIDP.2008.4772784","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772784","url":null,"abstract":"Effects of nanofiller loading on the carrier transport and molecular motion in polyamide-6/mica nanocomposites were discussed by analyzing their complex permittivity spectra. As a result, the following four dielectric polarization processes were observed; space charge polarization, alpha relaxation due to dipolar orientation, and beta relaxation due to rotation of amide groups bonded with water molecules, in addition to interfacial polarization at crystalline/amorphous boundaries. The enhancement of dielectric constant and that of loss factor due to abundance of mobile charge carriers are suppressed by the nanofiller loading. These results suggest that carrier transport is suppressed by the nanofillers. Furthermore, it was found that relaxation time becomes longer by the mica nanofiller loading both for the dipolar orientation and for the rotation of amide groups. Molecular motion is considered to be restricted in nanocomposites, which indicates a strong interaction between the resin and filler.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82926268","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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