Pub Date : 2013-10-08DOI: 10.1109/ICSD.2013.6619910
T. Han, B. Du, Jingang Su, Yu Gao, Zongle Ma
In this paper, room temperature vulcanized (RTV) silicone rubber (SiR) was employed as test sample to investigate the relationship between electrical tree propagation characteristics and the low experiment temperature. Power frequency voltage was applied on the SiR specimens through the needle-plate electrode with the same radius of needle tips to initiate the electrical tree at different low experiment temperatures. Both the structures and growth characteristics of electrical tree in SiR were observed by using a digital camera and a microscope system. Obtained results show that electrical tree in RTV SiR is white gap tree channel which maybe composed of silicone compounds instead of carbonized channel in XLPE. Electrical tree in SiR all initiate from single branch, and the width of initiative single branch channel varies a lot with the electrical tree structure. The structure of at experiment temperature from 0 °C to -70 °C in RTV SiR can be classified into three categories, which are branch, bush and pine branch tree. The distribution of tree structures changes with the experiment temperature. At the temperature of -70 °C, pine branch tree take up a great proportion, however, bush tree becomes the dominant structure when the temperature rise up to -50 °C and -30 °C. All kinds of electrical tree grow rapidly in the first beginning of the treeing propagation, and this process lasts only a few minutes.
{"title":"Effects of low temperature on treeing phenomena of silicone rubber","authors":"T. Han, B. Du, Jingang Su, Yu Gao, Zongle Ma","doi":"10.1109/ICSD.2013.6619910","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619910","url":null,"abstract":"In this paper, room temperature vulcanized (RTV) silicone rubber (SiR) was employed as test sample to investigate the relationship between electrical tree propagation characteristics and the low experiment temperature. Power frequency voltage was applied on the SiR specimens through the needle-plate electrode with the same radius of needle tips to initiate the electrical tree at different low experiment temperatures. Both the structures and growth characteristics of electrical tree in SiR were observed by using a digital camera and a microscope system. Obtained results show that electrical tree in RTV SiR is white gap tree channel which maybe composed of silicone compounds instead of carbonized channel in XLPE. Electrical tree in SiR all initiate from single branch, and the width of initiative single branch channel varies a lot with the electrical tree structure. The structure of at experiment temperature from 0 °C to -70 °C in RTV SiR can be classified into three categories, which are branch, bush and pine branch tree. The distribution of tree structures changes with the experiment temperature. At the temperature of -70 °C, pine branch tree take up a great proportion, however, bush tree becomes the dominant structure when the temperature rise up to -50 °C and -30 °C. All kinds of electrical tree grow rapidly in the first beginning of the treeing propagation, and this process lasts only a few minutes.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"56 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":"128032358","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.2013.6619754
W. Du, B. Du, Jie Li, H. Du, Yu Gao, Kai Zhang
With advantage of excellent thermostability, mechanical property, polyimide films have been widely used in the aerial, nuclear, microelectronic industry. However, The dielectric breakdown of the polyimide films caused by surface charge often occurs and becomes one of main problems to the safety and reliability of insulation system. Addition of nanoparticles into polyimide films can improve the insulating properties compared with undoped material. Fluorination as the change of the chemical component in surface layer of polymers should give rise to the corresponding change in electrical properties of the surface layer thus influence the charge injection from electrodes when they are used as an insulator. In this paper, the study aimed at clarifying the effect of nanoparticles and fluorination on the surface charge accumulation and decay behaviors of polyimide films have been carried out. Polyimide/Al2O3 nanocomposite films were prepared with the weight percent of 0, 1, 3, 5, 7 wt% respectively. Samples were surface fluorinated in a laboratory vessel at about 328K (55 °C) using a F2/N2 mixture with 20% F2 by volume and 0.05 MPa (500 mbar) for 30 minutes. Corona charging tests were performed at room temperature with a relative humidity of ~ 40%. The charge distribution was measured by means of an electrostatic voltmeter. Obtained results show the dependence of the charge density as well as the charge decay rate upon the nanoparticle content and the fluorination, varying as a function of the charging time. It is suggested that the nanoparticles and the fluorination can significantly affect the decay rate of the surface charge in polyimide nanocomposite films.
{"title":"Effects of direct fluorination on surface charge of polyimide/Al2O3 nanocomposite films","authors":"W. Du, B. Du, Jie Li, H. Du, Yu Gao, Kai Zhang","doi":"10.1109/ICSD.2013.6619754","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619754","url":null,"abstract":"With advantage of excellent thermostability, mechanical property, polyimide films have been widely used in the aerial, nuclear, microelectronic industry. However, The dielectric breakdown of the polyimide films caused by surface charge often occurs and becomes one of main problems to the safety and reliability of insulation system. Addition of nanoparticles into polyimide films can improve the insulating properties compared with undoped material. Fluorination as the change of the chemical component in surface layer of polymers should give rise to the corresponding change in electrical properties of the surface layer thus influence the charge injection from electrodes when they are used as an insulator. In this paper, the study aimed at clarifying the effect of nanoparticles and fluorination on the surface charge accumulation and decay behaviors of polyimide films have been carried out. Polyimide/Al2O3 nanocomposite films were prepared with the weight percent of 0, 1, 3, 5, 7 wt% respectively. Samples were surface fluorinated in a laboratory vessel at about 328K (55 °C) using a F2/N2 mixture with 20% F2 by volume and 0.05 MPa (500 mbar) for 30 minutes. Corona charging tests were performed at room temperature with a relative humidity of ~ 40%. The charge distribution was measured by means of an electrostatic voltmeter. Obtained results show the dependence of the charge density as well as the charge decay rate upon the nanoparticle content and the fluorination, varying as a function of the charging time. It is suggested that the nanoparticles and the fluorination can significantly affect the decay rate of the surface charge in polyimide nanocomposite films.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"65 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":"125857321","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.2013.6619763
Ke Yang, Xingyi Huang, Fei Liu, P. Jiang
The incorporation of high-dielectric-constant ceramic nano-filler into polymer matrix is an important approach to prepare polymer composites with excellent dielectric performance. However, the easy aggregation of inorganic nano-filler generally not only results in poor film quality and inhomogeneities, but also affects the dielectric performance. Herein, a novel route to prepare core-shell structured nanocomposites with excellent dielectric performance is reported. The promising approach using in situ RAFT polymerization to graft polystyrene (PS) from the BaTiO3 surface, and the insulating polymer shells not only act as interlayers to prevent the agglomeration of the nanoparticles, but also act as the matrix. The PS shell thickness could be well controlled by adjusting the feed ratio of styrene to BaTiO3. The dielectric performance of the PS@BaTiO3 nanocomposites is studied by broadband dielectric spectroscopy from 1 Hz to 1 MHz at room temperature. The dielectric constant of the nanocomposites is significantly enhanced (more than 7.9 times) as the BaTiO3 content increasing and the dielectric loss is maintained in a relatively low level (<; 0.015). Moreover, the dielectric constant of such nanocomposites has weak frequency dependence in a very wide frequency range.
{"title":"Preparation of core-shell structured polystyrene/BaTiO3 nanoparticles via in situ RAFT polymerization for high-performance dielectric nanocomposites","authors":"Ke Yang, Xingyi Huang, Fei Liu, P. Jiang","doi":"10.1109/ICSD.2013.6619763","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619763","url":null,"abstract":"The incorporation of high-dielectric-constant ceramic nano-filler into polymer matrix is an important approach to prepare polymer composites with excellent dielectric performance. However, the easy aggregation of inorganic nano-filler generally not only results in poor film quality and inhomogeneities, but also affects the dielectric performance. Herein, a novel route to prepare core-shell structured nanocomposites with excellent dielectric performance is reported. The promising approach using in situ RAFT polymerization to graft polystyrene (PS) from the BaTiO3 surface, and the insulating polymer shells not only act as interlayers to prevent the agglomeration of the nanoparticles, but also act as the matrix. The PS shell thickness could be well controlled by adjusting the feed ratio of styrene to BaTiO3. The dielectric performance of the PS@BaTiO3 nanocomposites is studied by broadband dielectric spectroscopy from 1 Hz to 1 MHz at room temperature. The dielectric constant of the nanocomposites is significantly enhanced (more than 7.9 times) as the BaTiO3 content increasing and the dielectric loss is maintained in a relatively low level (<; 0.015). Moreover, the dielectric constant of such nanocomposites has weak frequency dependence in a very wide frequency range.","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":"125960273","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.2013.6619736
G. Montanari, D. Fabiani, L. Dissado
Cross-linked polyethylene and flexible epoxy resin samples have shown a conduction mechanism, never observed before, consisting of repeated ultra-fast charge pulses travelling across insulation with much higher mobility those of traditional charge carriers. This phenomenon seems to be governed by mechanical relaxation of polymer chains. Indeed, materials mechanically rigid, such as e.g. glassy epoxy, do not exhibit this behavior, unless addition of nanoadditives can increase partially the material flexibility, thereby allowing charge pulses to be incepted. Moreover, it was observed that the application of an external mechanical force can influence significantly fast charge pulse features. This would demonstrate that such a conduction mechanism is not governed by traps, but it is driven by the contribution of polarization and the resultant electromechanical compression. This is able to generate solitons, in the form of charge pulses, whose amplitude, mobility and repetition rate are influenced by the mechanical properties of the polymer.
{"title":"Fast charge pulses: The evidence and its interpretation","authors":"G. Montanari, D. Fabiani, L. Dissado","doi":"10.1109/ICSD.2013.6619736","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619736","url":null,"abstract":"Cross-linked polyethylene and flexible epoxy resin samples have shown a conduction mechanism, never observed before, consisting of repeated ultra-fast charge pulses travelling across insulation with much higher mobility those of traditional charge carriers. This phenomenon seems to be governed by mechanical relaxation of polymer chains. Indeed, materials mechanically rigid, such as e.g. glassy epoxy, do not exhibit this behavior, unless addition of nanoadditives can increase partially the material flexibility, thereby allowing charge pulses to be incepted. Moreover, it was observed that the application of an external mechanical force can influence significantly fast charge pulse features. This would demonstrate that such a conduction mechanism is not governed by traps, but it is driven by the contribution of polarization and the resultant electromechanical compression. This is able to generate solitons, in the form of charge pulses, whose amplitude, mobility and repetition rate are influenced by the mechanical properties of the polymer.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"8 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":"127288889","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.2013.6619781
Huafeng Su, Z. Jia, Z. Guan
This paper simulates a.c. 110 kV and 220 kV composite insulator flashover induced by bird excretion. It finds that contaminated wet composite insulators are more likely to suffer from bird excretion flashovers than dry clean ones. Wet contaminated composite insulator flashover induced by bird excretion is the combination of arcing along the insulator surface and the breakdown along the dry arc distance. Meanwhile, dry clean composite insulator flashover induced by bird excretion is usually only the result of air breakdown along the dry arc distance. The maximum value of the distance between the bird excretion falling passage and contaminated wet insulator shed to induce flashovers is higher than that of a dry clean one. Some of the unexplained flashovers may actually be induced by bird excretion.
{"title":"Flashover of composite insulators induced by bird excretion","authors":"Huafeng Su, Z. Jia, Z. Guan","doi":"10.1109/ICSD.2013.6619781","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619781","url":null,"abstract":"This paper simulates a.c. 110 kV and 220 kV composite insulator flashover induced by bird excretion. It finds that contaminated wet composite insulators are more likely to suffer from bird excretion flashovers than dry clean ones. Wet contaminated composite insulator flashover induced by bird excretion is the combination of arcing along the insulator surface and the breakdown along the dry arc distance. Meanwhile, dry clean composite insulator flashover induced by bird excretion is usually only the result of air breakdown along the dry arc distance. The maximum value of the distance between the bird excretion falling passage and contaminated wet insulator shed to induce flashovers is higher than that of a dry clean one. Some of the unexplained flashovers may actually be induced by bird excretion.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"49 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":"124332027","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.2013.6619657
L. Lan, Q. Zhong, Y. Yin, Xuguang Li
Joints and terminations in polymer insulated HVDC cable system have been identified as weak points with much higher failure probability than the cable itself. This is mainly due to space charge accumulation at interfaces between different insulating materials. According to the Maxwell-Wagner-Sillars polarization theory, the accumulation of interfacial charge depends on conductivity and permittivity mismatch. Fluorination had been reported as a surface modification method of polymer dielectrics, which may lead to remarkable increase in permittivity and conductivity, thus could be a possible way to reduce space charge at the insulation interface of cable and its accessory. This paper presents the results of pulsed electro-acoustic (PEA) measurement of space charge distribution in LDPE/EPDM double-layer sample subjected to a DC field. Original and fluorinated LDPE layer were both used to study the effect of surface fluorination on space charge behavior at LDPE/EPDM interface. The results show that a significant amount of space charge accumulated at the interface of the original-LDPE/EPDM sample. And the property of the interfacial charge changed a lot after the LDPE layer is surface fluorinated.
{"title":"Effect of surface fluorination on space charge behavior at LDPE/EPDM interface","authors":"L. Lan, Q. Zhong, Y. Yin, Xuguang Li","doi":"10.1109/ICSD.2013.6619657","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619657","url":null,"abstract":"Joints and terminations in polymer insulated HVDC cable system have been identified as weak points with much higher failure probability than the cable itself. This is mainly due to space charge accumulation at interfaces between different insulating materials. According to the Maxwell-Wagner-Sillars polarization theory, the accumulation of interfacial charge depends on conductivity and permittivity mismatch. Fluorination had been reported as a surface modification method of polymer dielectrics, which may lead to remarkable increase in permittivity and conductivity, thus could be a possible way to reduce space charge at the insulation interface of cable and its accessory. This paper presents the results of pulsed electro-acoustic (PEA) measurement of space charge distribution in LDPE/EPDM double-layer sample subjected to a DC field. Original and fluorinated LDPE layer were both used to study the effect of surface fluorination on space charge behavior at LDPE/EPDM interface. The results show that a significant amount of space charge accumulated at the interface of the original-LDPE/EPDM sample. And the property of the interfacial charge changed a lot after the LDPE layer is surface fluorinated.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"55 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":"123139714","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.2013.6619788
M. Nazemi, V. Hinrichsen
For this contribution, different oscillation modes of a 20 microliter water droplet on the hydrophobic surface of a silicone rubber insulator under tangential AC electric field stress were investigated, using a high speed camera. Since the deformation of water droplet increases the local electric field stress at the triple zones, an electric field analysis at the triple zone is performed to find the worst case of water droplet oscillation modes. Different kinds of water droplet deformation at four dominant oscillation modes, namely mode No. 1 to mode No. 4, which were found experimentally, are simulated and compared. These results show that mode Nos. 1 and 3 provide higher electric field values at the triple zone in comparison to mode Nos. 2 and 4. In parallel, partial discharge inception voltages of a 20 microliter water droplet located on the hydrophobic surface of a silicone rubber insulator under tangential AC electric field stress are measured in the frequency range of 20 Hz to 100 Hz. With the aid of frame analysis of the captured videos, the mode number of water droplet oscillation at each frequency is obtained, and the measured partial discharge inception voltages at each oscillation mode are compared with electric field simulation results. Partial discharge investigations confirmed that the water droplets oscillating at mode Nos. 1 and 3 have lower inception voltages compared to PD inception voltages of water droplets that oscillate at mode Nos. 2 and 4. These measurements also show that inception voltage makes a step whenever the oscillation mode of water droplet changes.
{"title":"Partial discharge investigation and electric field analysis of different oscillation modes of water droplets on the surface of polymeric insulator under tangential AC electric field stress","authors":"M. Nazemi, V. Hinrichsen","doi":"10.1109/ICSD.2013.6619788","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619788","url":null,"abstract":"For this contribution, different oscillation modes of a 20 microliter water droplet on the hydrophobic surface of a silicone rubber insulator under tangential AC electric field stress were investigated, using a high speed camera. Since the deformation of water droplet increases the local electric field stress at the triple zones, an electric field analysis at the triple zone is performed to find the worst case of water droplet oscillation modes. Different kinds of water droplet deformation at four dominant oscillation modes, namely mode No. 1 to mode No. 4, which were found experimentally, are simulated and compared. These results show that mode Nos. 1 and 3 provide higher electric field values at the triple zone in comparison to mode Nos. 2 and 4. In parallel, partial discharge inception voltages of a 20 microliter water droplet located on the hydrophobic surface of a silicone rubber insulator under tangential AC electric field stress are measured in the frequency range of 20 Hz to 100 Hz. With the aid of frame analysis of the captured videos, the mode number of water droplet oscillation at each frequency is obtained, and the measured partial discharge inception voltages at each oscillation mode are compared with electric field simulation results. Partial discharge investigations confirmed that the water droplets oscillating at mode Nos. 1 and 3 have lower inception voltages compared to PD inception voltages of water droplets that oscillate at mode Nos. 2 and 4. These measurements also show that inception voltage makes a step whenever the oscillation mode of water droplet changes.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"1 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":"130355356","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.2013.6619868
A. Wagner, J. Knauel
Syntactic foam is a light weight high voltage insulation material that consists of micro-scale hollow particles, so called hollow microspheres (HMS) embedded in a polymeric matrix. The material properties of this hybrid material can be customized to special needs concerning the required properties. For outdoor applications the independence of the properties of insulation materials on the presence of water is necessary. Therefore the dielectric properties of syntactic foam and their behavior when immersed in water are investigated. Plate specimens of 3 mm thickness are stored over a period of 50 days in deionized water tempered to 50°C for the purpose of accelerated water absorption. The relative permittivity as well as the dissipation factor of various compositions of syntactic foam before and after water immersion are compared. The foam compositions vary in the matrix material and the HMS shell material. Further, the compositions vary in the filling degree as well as the HMS diameter. Hence, the influences of these parameters are also investigated. It is observed that the change in the dielectric properties of syntactic foam due to water ingress depends on the polymer matrix, the filler type and the filling degree.
{"title":"Investigations on the dielectric properties of syntactic foams and the change of their dielectric properties due to water immersion","authors":"A. Wagner, J. Knauel","doi":"10.1109/ICSD.2013.6619868","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619868","url":null,"abstract":"Syntactic foam is a light weight high voltage insulation material that consists of micro-scale hollow particles, so called hollow microspheres (HMS) embedded in a polymeric matrix. The material properties of this hybrid material can be customized to special needs concerning the required properties. For outdoor applications the independence of the properties of insulation materials on the presence of water is necessary. Therefore the dielectric properties of syntactic foam and their behavior when immersed in water are investigated. Plate specimens of 3 mm thickness are stored over a period of 50 days in deionized water tempered to 50°C for the purpose of accelerated water absorption. The relative permittivity as well as the dissipation factor of various compositions of syntactic foam before and after water immersion are compared. The foam compositions vary in the matrix material and the HMS shell material. Further, the compositions vary in the filling degree as well as the HMS diameter. Hence, the influences of these parameters are also investigated. It is observed that the change in the dielectric properties of syntactic foam due to water ingress depends on the polymer matrix, the filler type and the filling degree.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"26 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":"115055261","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.2013.6619869
L. Xiufeng, Xu Man, L. Xin, Zhang Kai, Xie Darong, Tong Jianping, Cao Xiaolong
In this paper, a series of montmorillonite/Cross-linked polyethylene nanocomposites containing different compatililizer (vinyl acetate copolymer (EVA) or ethylene-ethyl acrylate (EEA)) are prepared by melting blending method. The influence of compatibilizer on the dielectric property of the nanocomposites is studied. DSC is used to study the melting and crystallization behaviors of nanocomposites with and without compatibilizer. Dielectric spectrum of the nanocomposite is tested in room temperature. Dielectric constant and loss factor of different nanocomposites in wide frequency range are analyzed and the dynamic polarization behavior is discussed by the universal relaxation law (URL). Based on the structure characteristics, the effect of compatibilizer on the nanocomposite polarization is obtained.
{"title":"The influence of compatibilizer on structural morphology and dielectric property of crosslinked polyethylene/montmorillonite nanocomposites","authors":"L. Xiufeng, Xu Man, L. Xin, Zhang Kai, Xie Darong, Tong Jianping, Cao Xiaolong","doi":"10.1109/ICSD.2013.6619869","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619869","url":null,"abstract":"In this paper, a series of montmorillonite/Cross-linked polyethylene nanocomposites containing different compatililizer (vinyl acetate copolymer (EVA) or ethylene-ethyl acrylate (EEA)) are prepared by melting blending method. The influence of compatibilizer on the dielectric property of the nanocomposites is studied. DSC is used to study the melting and crystallization behaviors of nanocomposites with and without compatibilizer. Dielectric spectrum of the nanocomposite is tested in room temperature. Dielectric constant and loss factor of different nanocomposites in wide frequency range are analyzed and the dynamic polarization behavior is discussed by the universal relaxation law (URL). Based on the structure characteristics, the effect of compatibilizer on the nanocomposite polarization is obtained.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"1 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":"130788783","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.2013.6619829
H. Illias, M. Othman, M. Tunio, A. Bakar, H. Mokhlis, G. Chen, P. Lewin, A. M. Ariffin
In high voltage power cable, partial discharge (PD) phenomenon may occur within defects that exist in its insulation system. The insulation is normally made of a dielectric material, typically polymeric materials. Repetition of PD activity at the defect site may cause insulation breakdown when the defect grows until it bridges the electrodes between the insulation. Consequently, breakdown of the whole cable will occur. Thus, measurement of PD activity within cable insulation system has been extensively used to monitor the condition of power cables in service. A void cavity is one of the most common PD sources when a cable insulation is stressed under high electric field. In this work, measurements of PD activity within an artificial cylindrical void in the insulation layer of a 22 kV cross-linked polyethylene (XLPE) cable was performed. A two-dimensional model of a cable insulation geometry with a void was also developed using finite element analysis (FEA) software. The model was used to calculate the electric field magnitude in the void within the cable insulation under different conditions of voids and insulation. From this work, an understanding on PD phenomenon within a cylindrical void in a power cable insulation can be enhanced.
{"title":"Measurement and simulation of partial discharge activity within a void cavity in a polymeric power cable model","authors":"H. Illias, M. Othman, M. Tunio, A. Bakar, H. Mokhlis, G. Chen, P. Lewin, A. M. Ariffin","doi":"10.1109/ICSD.2013.6619829","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619829","url":null,"abstract":"In high voltage power cable, partial discharge (PD) phenomenon may occur within defects that exist in its insulation system. The insulation is normally made of a dielectric material, typically polymeric materials. Repetition of PD activity at the defect site may cause insulation breakdown when the defect grows until it bridges the electrodes between the insulation. Consequently, breakdown of the whole cable will occur. Thus, measurement of PD activity within cable insulation system has been extensively used to monitor the condition of power cables in service. A void cavity is one of the most common PD sources when a cable insulation is stressed under high electric field. In this work, measurements of PD activity within an artificial cylindrical void in the insulation layer of a 22 kV cross-linked polyethylene (XLPE) cable was performed. A two-dimensional model of a cable insulation geometry with a void was also developed using finite element analysis (FEA) software. The model was used to calculate the electric field magnitude in the void within the cable insulation under different conditions of voids and insulation. From this work, an understanding on PD phenomenon within a cylindrical void in a power cable insulation can be enhanced.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"89 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":"132174485","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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