Pub Date : 2016-07-03DOI: 10.1109/ICD.2016.7547695
C. Guillermin, S. Fontana
The dielectric strength of unaged and aged capacitor elements is described using a 2-parameters Weibull statistical analysis. The experimental results suggest that aged elements can be split in two populations. The electric stress at the electrode edge is shown to be an important parameter regarding the decrease of dielectric strength. A threshold value of the stress in this area was determined from the bibliography and is confirmed by the experimental evidence.
{"title":"Breakdown strength of impregnated capacitor elements","authors":"C. Guillermin, S. Fontana","doi":"10.1109/ICD.2016.7547695","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547695","url":null,"abstract":"The dielectric strength of unaged and aged capacitor elements is described using a 2-parameters Weibull statistical analysis. The experimental results suggest that aged elements can be split in two populations. The electric stress at the electrode edge is shown to be an important parameter regarding the decrease of dielectric strength. A threshold value of the stress in this area was determined from the bibliography and is confirmed by the experimental evidence.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122853291","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 : 2016-07-03DOI: 10.1109/ICD.2016.7547656
Tianlong Zhang, Xuezhong Liu, Guanfang Liu, Pingzhen Lei
This research mainly focuses on the PD detection for stator winding under induced impulse voltage in order to diagnose the insulation defects, especially in inter-turn insulation. The PD test result may help evaluate the integrity and quality of insulation in a form-wound stator winding of wind turbine generator (WTG). In previous work, a test system which consists of impulse voltage generator, auxiliary magnetic core and exciting coil, and high frequency current sensor has been established and applied in inter-turn PD detection for single coil. The situation gets complicated in a winding compare to the impulse induction in a single coil. In this research, a series of impulse induction tests in a real stator winding were accomplished. Impulse voltage distributions along the winding was measured and recorded when impulse voltage was induced at certain coil (target coil). Then impulse induction with two induction units in series at two adjacent target coils was studied and summarized. Four character parameters were put forward to help evaluate whether the impulse distribution is suitable for the purpose of PD detection. High frequency current sensor is applied to detect the PD related signals in the inter-turn insulation.
{"title":"Research on PD detection method under induced impulse voltage for stator winding of wind turbine generator","authors":"Tianlong Zhang, Xuezhong Liu, Guanfang Liu, Pingzhen Lei","doi":"10.1109/ICD.2016.7547656","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547656","url":null,"abstract":"This research mainly focuses on the PD detection for stator winding under induced impulse voltage in order to diagnose the insulation defects, especially in inter-turn insulation. The PD test result may help evaluate the integrity and quality of insulation in a form-wound stator winding of wind turbine generator (WTG). In previous work, a test system which consists of impulse voltage generator, auxiliary magnetic core and exciting coil, and high frequency current sensor has been established and applied in inter-turn PD detection for single coil. The situation gets complicated in a winding compare to the impulse induction in a single coil. In this research, a series of impulse induction tests in a real stator winding were accomplished. Impulse voltage distributions along the winding was measured and recorded when impulse voltage was induced at certain coil (target coil). Then impulse induction with two induction units in series at two adjacent target coils was studied and summarized. Four character parameters were put forward to help evaluate whether the impulse distribution is suitable for the purpose of PD detection. High frequency current sensor is applied to detect the PD related signals in the inter-turn insulation.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128780052","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 : 2016-07-03DOI: 10.1109/ICD.2016.7547775
H. Sedding, G. Stone, A. Shaikh
Dielectric dissipation factor (DDF) testing is widely employed by manufacturers and end users of rotating machines to assess the quality (or uniformity) of the insulation of individual stator coils and bars. A new IEC standard (IEC 60034-27-3) has been developed to provide guidance not only on the test method but also on maximum permitted values of DDF. The relevant section of the standard also defines the test voltages at which DDF measurements are obtained. During the drafting of the standard, there was significant discussion concerning the appropriateness of the DDF levels that are contained in the document. The purpose of this contribution is to examine these levels in the context of DDF data obtained over a period of decades on large numbers of stator coils and bars employing a wide range of insulation systems. An analysis of the data is presented and compared with the IEC 60034-27-3 limits and the implications discussed.
{"title":"Dielectric dissipation factor acceptance criteria for stator winding insulation","authors":"H. Sedding, G. Stone, A. Shaikh","doi":"10.1109/ICD.2016.7547775","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547775","url":null,"abstract":"Dielectric dissipation factor (DDF) testing is widely employed by manufacturers and end users of rotating machines to assess the quality (or uniformity) of the insulation of individual stator coils and bars. A new IEC standard (IEC 60034-27-3) has been developed to provide guidance not only on the test method but also on maximum permitted values of DDF. The relevant section of the standard also defines the test voltages at which DDF measurements are obtained. During the drafting of the standard, there was significant discussion concerning the appropriateness of the DDF levels that are contained in the document. The purpose of this contribution is to examine these levels in the context of DDF data obtained over a period of decades on large numbers of stator coils and bars employing a wide range of insulation systems. An analysis of the data is presented and compared with the IEC 60034-27-3 limits and the implications discussed.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116038386","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 : 2016-07-03DOI: 10.1109/ICD.2016.7547543
Yash Thakur, Tian Zhang, Minren Lin, Q. Zhang, M. Lean
Dielectric materials with high electrical energy density, low loss, and high thermal stability are desirable for a broad range of modern power electronic systems. Here, we investigate the conduction mechanism at high temperatures and high fields in a semi-crystalline poly(tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride) (THV) terpolymer, which has been shown to be attractive for high temperature and high energy density capacitors. In order to suppress conduction at high temperature and high electric field, alumina (Al2O3) nanofillers were added to the THV polymer matrix. Experimental results show that the Al2O3 nanofillers are very effective in reducing the conduction current, and at 125°C nanocomposites exhibit more than two orders of magnitude reduction in conduction compared to the neat polymer. Continuum and particle simulations were carried out to understand the leakage conductivity, and simulation results agree very well with the measured data. Hopping conduction has been identified as the dominant conduction mechanism.
{"title":"Mitigation of conduction loss in a semi-crystalline polymer with high dielectric constant and high charge-discharge efficiency","authors":"Yash Thakur, Tian Zhang, Minren Lin, Q. Zhang, M. Lean","doi":"10.1109/ICD.2016.7547543","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547543","url":null,"abstract":"Dielectric materials with high electrical energy density, low loss, and high thermal stability are desirable for a broad range of modern power electronic systems. Here, we investigate the conduction mechanism at high temperatures and high fields in a semi-crystalline poly(tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride) (THV) terpolymer, which has been shown to be attractive for high temperature and high energy density capacitors. In order to suppress conduction at high temperature and high electric field, alumina (Al2O3) nanofillers were added to the THV polymer matrix. Experimental results show that the Al2O3 nanofillers are very effective in reducing the conduction current, and at 125°C nanocomposites exhibit more than two orders of magnitude reduction in conduction compared to the neat polymer. Continuum and particle simulations were carried out to understand the leakage conductivity, and simulation results agree very well with the measured data. Hopping conduction has been identified as the dominant conduction mechanism.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115698730","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 : 2016-07-03DOI: 10.1109/ICD.2016.7547798
Qingyu Wang, Xi Yang, He Li, Zihao Guo, Zongren Peng
Composite towers have advantages in saving line corridors, light weight, easy transportation, and good electrical insulation properties attracting increasing attention from researchers. The 1000 kV composite tower adopts partial insulation design, and part of the tower will be replaced with composite material. Due to its high voltage level and complex structure, potential and electric field sharing problems are serious, further research is highly necessary. In this paper, applying three dimension finite element method, the voltage and electric distribution of 1000 kV composite tower has been calculated; the potential distribution of 1000 kV composite tower is compared with 1000 kV line tower. The results show that the potential distribution of 1000 kV composite tower is superior to the potential distribution of 1000 kV line tower. The initial design of the 1000 kV composite tower can't meet the critical requirements for the electric field strength. After optimization, the maximum electric field strength on key location of composite tower is below control value. The research achievements provide basis for the application of new composite tower, and ensuring the safety and reliability of UHV transmission lines.
{"title":"Computation and analysis of the electric field distribution and voltage-sharing characteristics for 1000 kV composite tower","authors":"Qingyu Wang, Xi Yang, He Li, Zihao Guo, Zongren Peng","doi":"10.1109/ICD.2016.7547798","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547798","url":null,"abstract":"Composite towers have advantages in saving line corridors, light weight, easy transportation, and good electrical insulation properties attracting increasing attention from researchers. The 1000 kV composite tower adopts partial insulation design, and part of the tower will be replaced with composite material. Due to its high voltage level and complex structure, potential and electric field sharing problems are serious, further research is highly necessary. In this paper, applying three dimension finite element method, the voltage and electric distribution of 1000 kV composite tower has been calculated; the potential distribution of 1000 kV composite tower is compared with 1000 kV line tower. The results show that the potential distribution of 1000 kV composite tower is superior to the potential distribution of 1000 kV line tower. The initial design of the 1000 kV composite tower can't meet the critical requirements for the electric field strength. After optimization, the maximum electric field strength on key location of composite tower is below control value. The research achievements provide basis for the application of new composite tower, and ensuring the safety and reliability of UHV transmission lines.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114308901","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 : 2016-07-03DOI: 10.1109/ICD.2016.7547749
T. Christen, R. Kochetov, L. Almquist
Common small-amplitude dielectric spectroscopy (DS) is restricted to linear response. We discuss here two concepts of DS at high voltages for characterizing nonlinear insulation behavior relevant for HVDC equipment. The first method uses the higher harmonics of the current, which are naturally generated by nonlinearities. The second method measures small-signal linear response with a superimposed high steady-state voltage, which yields the differential admittance. After a brief introduction to the theoretical prerequisites, experimental results for two illustrative material types are discussed, a polymer-filler composite used for electrical field-grading and a ZnO varistor ceramics used in surge arrestors. Particular focus is on the reconstruction of the current-voltage characteristics. General experimental feasibility of the methods is proven by showing consistency of the different measurements. Additionally, materials with non-robust electrical behavior or very long relaxation times can be identified from inconsistencies, which also provide the limits of the methods.
{"title":"High-voltage low-frequency dielectric-spectroscopy used for characterization of nonlinear insulation materials","authors":"T. Christen, R. Kochetov, L. Almquist","doi":"10.1109/ICD.2016.7547749","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547749","url":null,"abstract":"Common small-amplitude dielectric spectroscopy (DS) is restricted to linear response. We discuss here two concepts of DS at high voltages for characterizing nonlinear insulation behavior relevant for HVDC equipment. The first method uses the higher harmonics of the current, which are naturally generated by nonlinearities. The second method measures small-signal linear response with a superimposed high steady-state voltage, which yields the differential admittance. After a brief introduction to the theoretical prerequisites, experimental results for two illustrative material types are discussed, a polymer-filler composite used for electrical field-grading and a ZnO varistor ceramics used in surge arrestors. Particular focus is on the reconstruction of the current-voltage characteristics. General experimental feasibility of the methods is proven by showing consistency of the different measurements. Additionally, materials with non-robust electrical behavior or very long relaxation times can be identified from inconsistencies, which also provide the limits of the methods.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"258 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115793448","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 : 2016-07-03DOI: 10.1109/ICD.2016.7547788
Weiwei Li, Fang Xin, K. Zhu, Bin Zhu, Ye Yuan, Z. Jia, Mengxin Song, Xilin Wang
In recent years, medium voltage power cable has been widely used in the transmission and distribution network. However, the fault rate of cable accessories has increased year by year. During the fabrication and operation of cable accessories, the moisture can easily enter into cable accessories and make it damp, which will influence the insulation condition and lead to the failure of cable. In this paper, test platform of cable whose temperature was risen by load, was built, and four cables with damp cable terminations were selected. The insulation resistance and dielectric loss tangent under different temperatures were measured to study the variation law of insulation resistance and dielectric loss tangent influenced by temperature and damp. There was evaporation of moisture during the test. With the rise of temperature, the damp degree of termination was mitigated, and the insulation conditions improved, due to the evaporation of moisture. As the temperature continued to rise, the effect of temperature on the insulating materials gradually become the main factor affecting of insulation state, deteriorated.
{"title":"Research on insulation condition of damp cable termination under different temperatures","authors":"Weiwei Li, Fang Xin, K. Zhu, Bin Zhu, Ye Yuan, Z. Jia, Mengxin Song, Xilin Wang","doi":"10.1109/ICD.2016.7547788","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547788","url":null,"abstract":"In recent years, medium voltage power cable has been widely used in the transmission and distribution network. However, the fault rate of cable accessories has increased year by year. During the fabrication and operation of cable accessories, the moisture can easily enter into cable accessories and make it damp, which will influence the insulation condition and lead to the failure of cable. In this paper, test platform of cable whose temperature was risen by load, was built, and four cables with damp cable terminations were selected. The insulation resistance and dielectric loss tangent under different temperatures were measured to study the variation law of insulation resistance and dielectric loss tangent influenced by temperature and damp. There was evaporation of moisture during the test. With the rise of temperature, the damp degree of termination was mitigated, and the insulation conditions improved, due to the evaporation of moisture. As the temperature continued to rise, the effect of temperature on the insulating materials gradually become the main factor affecting of insulation state, deteriorated.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125334753","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 : 2016-07-03DOI: 10.1109/ICD.2016.7547741
A. Rajab, M. Tsuchie, M. Kozako, M. Hikita, Takashi Suzuki
Partial discharge properties and gas generation of palm fatty acid ester (PFAE) oil of various moisture content levels are investigated under AC high voltage utilizing needle plane electrode configuration. Partial discharge inception voltage (PDIV) at various oil sample conditions are discussed. Variations of PD magnitude and PD number against voltage application change are analyzed. The effects of moisture content on PD properties and generated combustible gases of PFAE are also elaborated.
{"title":"PD properties and gases generated by palm fatty acids esters (PFAE) oil","authors":"A. Rajab, M. Tsuchie, M. Kozako, M. Hikita, Takashi Suzuki","doi":"10.1109/ICD.2016.7547741","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547741","url":null,"abstract":"Partial discharge properties and gas generation of palm fatty acid ester (PFAE) oil of various moisture content levels are investigated under AC high voltage utilizing needle plane electrode configuration. Partial discharge inception voltage (PDIV) at various oil sample conditions are discussed. Variations of PD magnitude and PD number against voltage application change are analyzed. The effects of moisture content on PD properties and generated combustible gases of PFAE are also elaborated.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125565250","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 : 2016-07-03DOI: 10.1109/ICD.2016.7547731
Y. Liu, Yu-Hao Su, Linjie Wang, Yang Xiao
Although DC cable with XLPE insulation has entered the stage of high-speed development, the measuring and diagnostic techniques for DC cables are not well developed yet. Tan δ measurement at very low frequency has been found to be a useful method for ageing condition assessment of AC XLPE insulation. In this paper, investigations are carried out on two DC cables, a 320 kV new one and a 160 kV old one. The latter has finished its one-year prequalification test. Specimens are taken from different layers, that is, the inner, middle and outer layers of the XLPE insulation with a circumferential peeling method. Tan δ of the specimens are measured under four voltage levels of 0.1 Hz, determined according to the insulation thickness and operating voltages of DC cables. After the measurement, all tan d values are normalized by taking the middle layer as the reference. The result shows that for the new cable, the normalized tan δ of different insulation layers are all close to 1. Contrary to that, for the old cable, the normalized tan δ of the inner and outer insulation layers are larger than 1.5, and they increase significantly with the increase of the 0.1 Hz voltage. Beside, a supplementary test is performed on a 110 kV AC XLPE cable which has come out of service after 24-year operation. This test further verifies the feasibility of this method. The results show that the normalization method introduced here is effective for minimizing the adverse effects of system errors. The ageing condition of XLPE cable insulation can be reflected efficiently by the absolute values of normalized tan d, its increase with voltage rise, as well as the deviation among different layers.
{"title":"Ageing condition assessment of DC cable XLPE insulation by Tan δ measurement at 0.1 Hz voltage","authors":"Y. Liu, Yu-Hao Su, Linjie Wang, Yang Xiao","doi":"10.1109/ICD.2016.7547731","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547731","url":null,"abstract":"Although DC cable with XLPE insulation has entered the stage of high-speed development, the measuring and diagnostic techniques for DC cables are not well developed yet. Tan δ measurement at very low frequency has been found to be a useful method for ageing condition assessment of AC XLPE insulation. In this paper, investigations are carried out on two DC cables, a 320 kV new one and a 160 kV old one. The latter has finished its one-year prequalification test. Specimens are taken from different layers, that is, the inner, middle and outer layers of the XLPE insulation with a circumferential peeling method. Tan δ of the specimens are measured under four voltage levels of 0.1 Hz, determined according to the insulation thickness and operating voltages of DC cables. After the measurement, all tan d values are normalized by taking the middle layer as the reference. The result shows that for the new cable, the normalized tan δ of different insulation layers are all close to 1. Contrary to that, for the old cable, the normalized tan δ of the inner and outer insulation layers are larger than 1.5, and they increase significantly with the increase of the 0.1 Hz voltage. Beside, a supplementary test is performed on a 110 kV AC XLPE cable which has come out of service after 24-year operation. This test further verifies the feasibility of this method. The results show that the normalization method introduced here is effective for minimizing the adverse effects of system errors. The ageing condition of XLPE cable insulation can be reflected efficiently by the absolute values of normalized tan d, its increase with voltage rise, as well as the deviation among different layers.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128072419","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 : 2016-07-03DOI: 10.1109/ICD.2016.7547806
Xiaolu Lyu, Haoran Wang, Zihao Guo, Zongren Peng
Epoxy based nanocomposites have drawn much interest in the field of dielectrics due to their excellent electrical properties. In this paper, the dielectric properties of epoxy-Al2O3 nanocomposites were studied at different filler concentrations by weight (0.5%-10%). The nanocomposite samples with good dispersion of nanoparticles were prepared using silane coupling agent and experiments were performed to measure the dielectric spectrum, dc volume resistance, and arc resistance time. The dielectric permittivities were analyzed in detail with respect to different frequencies and temperatures. The results demonstrated that the dielectric permittivities of nanocomposites were higher than the pure and the introduction of Al2O3 nano-fillers reduce the volume resistances of composites. In addition, enhancements of composites' arc resistance had been observed at low filler loading. The interesting characteristics of nanocomposites are attributed to the interface effects and the interactions between the nanoparticles and epoxy resin.
{"title":"Dielectric properties of epoxy-Al2O3 nanocomposites","authors":"Xiaolu Lyu, Haoran Wang, Zihao Guo, Zongren Peng","doi":"10.1109/ICD.2016.7547806","DOIUrl":"https://doi.org/10.1109/ICD.2016.7547806","url":null,"abstract":"Epoxy based nanocomposites have drawn much interest in the field of dielectrics due to their excellent electrical properties. In this paper, the dielectric properties of epoxy-Al2O3 nanocomposites were studied at different filler concentrations by weight (0.5%-10%). The nanocomposite samples with good dispersion of nanoparticles were prepared using silane coupling agent and experiments were performed to measure the dielectric spectrum, dc volume resistance, and arc resistance time. The dielectric permittivities were analyzed in detail with respect to different frequencies and temperatures. The results demonstrated that the dielectric permittivities of nanocomposites were higher than the pure and the introduction of Al2O3 nano-fillers reduce the volume resistances of composites. In addition, enhancements of composites' arc resistance had been observed at low filler loading. The interesting characteristics of nanocomposites are attributed to the interface effects and the interactions between the nanoparticles and epoxy resin.","PeriodicalId":306397,"journal":{"name":"2016 IEEE International Conference on Dielectrics (ICD)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125884953","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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