Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6748220
L. Jing, Chen Ruimin, Lin Chun-yao
To research the influence of inorganic fillers on arc resistance of silicone rubber, alumina trihydrate (Al(OH)3, ATH), boron nitride (BN) were chosen as fillers, unary filled and binary filled silicone rubber (SIR) specimens were prepared, the dispersion of organic fillers in SIR were characterized by scanning electron microscope (SEM), arc resistance of each specimen were investigated by high voltage low current arc test, and thermal degradation property was tested by thermogravimetric analysis. The results indicate that ATH unary filled SIR specimens show good performance during the arc test, but decompose seriously and loss much weight. Narrow conducting path forms rapidly when BN filled SIR specimens are exposed to arc discharge. The arc resistance property of ATH and BN binary filled SIR is improved as it takes the advantage of both ATH and BN.
{"title":"The arc resistance of binary filled silicone rubber","authors":"L. Jing, Chen Ruimin, Lin Chun-yao","doi":"10.1109/CEIDP.2013.6748220","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748220","url":null,"abstract":"To research the influence of inorganic fillers on arc resistance of silicone rubber, alumina trihydrate (Al(OH)3, ATH), boron nitride (BN) were chosen as fillers, unary filled and binary filled silicone rubber (SIR) specimens were prepared, the dispersion of organic fillers in SIR were characterized by scanning electron microscope (SEM), arc resistance of each specimen were investigated by high voltage low current arc test, and thermal degradation property was tested by thermogravimetric analysis. The results indicate that ATH unary filled SIR specimens show good performance during the arc test, but decompose seriously and loss much weight. Narrow conducting path forms rapidly when BN filled SIR specimens are exposed to arc discharge. The arc resistance property of ATH and BN binary filled SIR is improved as it takes the advantage of both ATH and BN.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132705778","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748321
L. Zhao, J. Su, X. B. Zhang, Y. Pan, L. Wang, R. Li, X. Sun, B. Zeng, J. Cheng
The general regularities of the electric surface flashover threshold (Ef) of polymers immersed in transformer oil and the polymers' bulk breakdown threshold (EBD) versus pulse width (τ) are obtained respectively by summarizing the experimental data in literatures. Those regularities are that Ef is proportional to τ-1/4 and that EBD is proportional to τ-1/6 when τ is smaller than 30 ns, when τ is larger than 30 ns, EBD is independent on τ It is discovered that there exists a critical pulse width (τc) by comparing the regularities of EBD and Ef versus τ of the same dielectric thickness in one coordinate. If τ is greater than τc, Ef is lower than EBD, and the surface flashover may cause the insulation to fail. However if τ is smaller than τc, Ef would be larger than EBD, and the bulk breakdown would cause the insulation to fail. The existence of τc is experimentally verified via a specific example of dozens of polymer samples immersed in transformer oil. In addition, methods on how to design short-pulse long-life insulators are proposed in this paper based on the concept of τc.
{"title":"The critical pulse width for surface flashover and bulk breakdown in oil-immersed polymers","authors":"L. Zhao, J. Su, X. B. Zhang, Y. Pan, L. Wang, R. Li, X. Sun, B. Zeng, J. Cheng","doi":"10.1109/CEIDP.2013.6748321","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748321","url":null,"abstract":"The general regularities of the electric surface flashover threshold (E<sub>f</sub>) of polymers immersed in transformer oil and the polymers' bulk breakdown threshold (E<sub>BD</sub>) versus pulse width (τ) are obtained respectively by summarizing the experimental data in literatures. Those regularities are that E<sub>f</sub> is proportional to τ<sup>-1/4</sup> and that E<sub>BD</sub> is proportional to τ<sup>-1/6</sup> when τ is smaller than 30 ns, when τ is larger than 30 ns, E<sub>BD</sub> is independent on τ It is discovered that there exists a critical pulse width (τ<sub>c</sub>) by comparing the regularities of E<sub>BD</sub> and E<sub>f</sub> versus τ of the same dielectric thickness in one coordinate. If τ is greater than τ<sub>c</sub>, E<sub>f</sub> is lower than E<sub>BD</sub>, and the surface flashover may cause the insulation to fail. However if τ is smaller than τ<sub>c</sub>, E<sub>f</sub> would be larger than E<sub>BD</sub>, and the bulk breakdown would cause the insulation to fail. The existence of τ<sub>c</sub> is experimentally verified via a specific example of dozens of polymer samples immersed in transformer oil. In addition, methods on how to design short-pulse long-life insulators are proposed in this paper based on the concept of τ<sub>c</sub>.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133140286","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748248
M. Florkowski, B. Florkowska, J. Roehrich, A. Rybak, P. Zydroń
Migration effects occurring at conductor/XLPE interface are presented in the paper. The phenomenon was studied under various electrical stresses: direct current (DC), pulse-width modulated (PWM) and sinusoidal (SIN). The comparison of aging effects on specimens subjected to the stimuli was presented. The electrical stress results in partial discharges, both around the electrode in the form of surface discharges and directly at the micro air gap interface between conductor and polymeric material. In order to isolate the impact of interface discharges, the surface effects were suppressed, eliminated and compared with results containing both forms of discharges. The electrical and thermal mechanism was investigated in the paper and assessment was performed by means of time to breakdown and both micro morphological and elemental analysis. Migration of the conductor, where metallic particles are transferred to the insulating medium, was observed. Primarily, attention was afforded to the migration of copper and aluminum electrode atoms in two zones; one zone being the direct contact area at the interface and the second zone incorporating the area surrounding the electrode which is enhanced by surface discharges. A novel aspect relates to the investigation of the migration depth profile and the concentration intensity at different voltage stresses. The transport phenomena were analyzed with respect to both electrical and thermal mechanisms.
{"title":"Migration effects at conductor / XLPE interface subjected to partial discharges at different electrical stresses","authors":"M. Florkowski, B. Florkowska, J. Roehrich, A. Rybak, P. Zydroń","doi":"10.1109/CEIDP.2013.6748248","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748248","url":null,"abstract":"Migration effects occurring at conductor/XLPE interface are presented in the paper. The phenomenon was studied under various electrical stresses: direct current (DC), pulse-width modulated (PWM) and sinusoidal (SIN). The comparison of aging effects on specimens subjected to the stimuli was presented. The electrical stress results in partial discharges, both around the electrode in the form of surface discharges and directly at the micro air gap interface between conductor and polymeric material. In order to isolate the impact of interface discharges, the surface effects were suppressed, eliminated and compared with results containing both forms of discharges. The electrical and thermal mechanism was investigated in the paper and assessment was performed by means of time to breakdown and both micro morphological and elemental analysis. Migration of the conductor, where metallic particles are transferred to the insulating medium, was observed. Primarily, attention was afforded to the migration of copper and aluminum electrode atoms in two zones; one zone being the direct contact area at the interface and the second zone incorporating the area surrounding the electrode which is enhanced by surface discharges. A novel aspect relates to the investigation of the migration depth profile and the concentration intensity at different voltage stresses. The transport phenomena were analyzed with respect to both electrical and thermal mechanisms.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134647145","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6747101
N. Gao, Wenxi Zhang, Z. Liu, Kefeng Huang, H. Jin, Chun Wu
In this paper, the epoxy resin/ inorganic filler composites were fabricated. The thermal aging test to the epoxy resin/ inorganic filler composites at different temperatures was carried out, the variations regulation of the tensile strength, elongation at break and weight-loss ratio with the aging time and temperature were investigated. The results showed that the tensile strength of the composites after the thermal aging of 145°C, 160°C and 175°C was higher than that of un-aged one. At the same aging time, the higher the aging temperature was, the larger the tensile strength was, and the lower the elongation at break would be. However, as the aging time extending continuously, the tensile strength and the elongation at break kept descending. In the early stage of the thermal aging, the weight-loss ratio of those composites emerged exponential growth with aging time, and then tended to be stable in the later aging time. In the process of aging, further curing of composite materials, low molecular substances volatilization of epoxy resin and interface defects were the main factors that had large influence to the tensile strength and the weight-loss ratio of the composite materials.
{"title":"Study on thermal aging characteristics of epoxy resin/inorganic filler composites for the fully casting bus bar","authors":"N. Gao, Wenxi Zhang, Z. Liu, Kefeng Huang, H. Jin, Chun Wu","doi":"10.1109/CEIDP.2013.6747101","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747101","url":null,"abstract":"In this paper, the epoxy resin/ inorganic filler composites were fabricated. The thermal aging test to the epoxy resin/ inorganic filler composites at different temperatures was carried out, the variations regulation of the tensile strength, elongation at break and weight-loss ratio with the aging time and temperature were investigated. The results showed that the tensile strength of the composites after the thermal aging of 145°C, 160°C and 175°C was higher than that of un-aged one. At the same aging time, the higher the aging temperature was, the larger the tensile strength was, and the lower the elongation at break would be. However, as the aging time extending continuously, the tensile strength and the elongation at break kept descending. In the early stage of the thermal aging, the weight-loss ratio of those composites emerged exponential growth with aging time, and then tended to be stable in the later aging time. In the process of aging, further curing of composite materials, low molecular substances volatilization of epoxy resin and interface defects were the main factors that had large influence to the tensile strength and the weight-loss ratio of the composite materials.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131272115","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748157
A. Cavallini, C. Azcarraga
Ester oils are making their way into the transformer market, but still some doubts exist about their ability to be successful fluids for high and extra-high voltage transformers. In this paper, we compare the PDIV of two commercially available fluids: a natural ester and mineral oil. Two different setups were considered: Point to plane in oil and point to plane on a pressboard sheet immersed in oil. Fluids and pressboard sheets were fully conditioned prior testing. Results suggest that ester oils perform slightly better with simple point-to-plane electrodes, independently of the gap length. When testing oil/plane electrode configurations with pressboard, ester oils perform much better at short gaps. This behavior has been explained considering the hydrophilicity of ester oils, which helps in further drying the pressboard prior testing. Therefore, ester oils could prove superior to mineral oils in suppressing creeping discharges.
{"title":"Comparison of partial discharge inception voltages for ester and mineral oils under divergent fields","authors":"A. Cavallini, C. Azcarraga","doi":"10.1109/CEIDP.2013.6748157","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748157","url":null,"abstract":"Ester oils are making their way into the transformer market, but still some doubts exist about their ability to be successful fluids for high and extra-high voltage transformers. In this paper, we compare the PDIV of two commercially available fluids: a natural ester and mineral oil. Two different setups were considered: Point to plane in oil and point to plane on a pressboard sheet immersed in oil. Fluids and pressboard sheets were fully conditioned prior testing. Results suggest that ester oils perform slightly better with simple point-to-plane electrodes, independently of the gap length. When testing oil/plane electrode configurations with pressboard, ester oils perform much better at short gaps. This behavior has been explained considering the hydrophilicity of ester oils, which helps in further drying the pressboard prior testing. Therefore, ester oils could prove superior to mineral oils in suppressing creeping discharges.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"104 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131279658","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748203
M. K. A. Muhamad, N. S. Midi, R. Ohyama
This research aims to investigate the electrical characteristics when lightning phenomenon occurred on water surface. In this work, measurement of electric potential and electric field distribution in tap water when spark discharge occurred on water surface are discussed. This paper presents the electrical characteristics of breakdown and occurrence filamentary discharge, voltage and current waveforms, electric potential and electric field between tap water and saline solution due to spark discharge on water surface.
{"title":"Electric potential in tap water and saline solution due to spark discharge on water surface","authors":"M. K. A. Muhamad, N. S. Midi, R. Ohyama","doi":"10.1109/CEIDP.2013.6748203","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748203","url":null,"abstract":"This research aims to investigate the electrical characteristics when lightning phenomenon occurred on water surface. In this work, measurement of electric potential and electric field distribution in tap water when spark discharge occurred on water surface are discussed. This paper presents the electrical characteristics of breakdown and occurrence filamentary discharge, voltage and current waveforms, electric potential and electric field between tap water and saline solution due to spark discharge on water surface.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127523865","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6747084
Chen Yan, Ruihua Li, Hao Li, Bo Hu
This paper mainly reports the experimental research on damage detection of large generator stator insulation using the theory of elastic guided waves. The characteristics parameters of the stator insulation material are gained through insulation materials tensile test. By the means of selecting the appropriate guided wave excitation signal and solving the equation of the Rayleigh-Lamb equation, the dispersion curves of the Lamb waves are obtained, which describes the relationship between phase/group velocity and frequency. Moreover, the curves provide a reference about the choice of frequency of the excitation signal. Consequently, the experimental system of damage detection of large generator stator insulation is built and damage detection experiment is preceded through the system. The results of the experiment verify the effectiveness and feasibility of the method using guided waves to detect the damage of large generator stator insulation, which offers a new research method to assess the condition of large generator stator insulation.
{"title":"Research on damage detection of large generator stator insulation using guided waves","authors":"Chen Yan, Ruihua Li, Hao Li, Bo Hu","doi":"10.1109/CEIDP.2013.6747084","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747084","url":null,"abstract":"This paper mainly reports the experimental research on damage detection of large generator stator insulation using the theory of elastic guided waves. The characteristics parameters of the stator insulation material are gained through insulation materials tensile test. By the means of selecting the appropriate guided wave excitation signal and solving the equation of the Rayleigh-Lamb equation, the dispersion curves of the Lamb waves are obtained, which describes the relationship between phase/group velocity and frequency. Moreover, the curves provide a reference about the choice of frequency of the excitation signal. Consequently, the experimental system of damage detection of large generator stator insulation is built and damage detection experiment is preceded through the system. The results of the experiment verify the effectiveness and feasibility of the method using guided waves to detect the damage of large generator stator insulation, which offers a new research method to assess the condition of large generator stator insulation.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133853831","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6747063
L. Lan, G. Yao, H. L. Wang, X. Wen, Z. X. Liu
Silicone rubber is the first choice for composite insulators' external insulation to improve the pollution flashover performance. It has many merits such as high hydrophobicity and transfer and recovery of the hydrophobicity, as well as the weakness such as poor aging performance because it is a kind of organic materials. Corona is one of the main factors that lead to the aging of silicone rubber. In this paper, corona aging tests of Nano-composite Room Temperature Vulcanized (RTV) and High Temperature Vulcanized (HTV) silicone rubber have been carried out. The effects of corona discharge on silicone rubber are shown with micro-analysis such as the morphology, X-ray Photoelectron Spectroscopy (XPS), and elemental components, which can help make clear what indeed happens to the silicone materials during corona aging. The results show that morphology and XPS can provide the qualitative analysis of the structural change of the silicone rubber materials caused by corona discharge, and the quantitative analysis of the elemental components before and after corona aging can indicate the chemical changes in the silicone rubber materials caused by corona discharge. The results also show that Nano-composite RTV is superior to HTV to suppress the damage from corona in the depth direction. This might be due to the contribution of Nano-composite materials.
{"title":"Characteristics of corona aged Nano-composite RTV and HTV silicone rubber","authors":"L. Lan, G. Yao, H. L. Wang, X. Wen, Z. X. Liu","doi":"10.1109/CEIDP.2013.6747063","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747063","url":null,"abstract":"Silicone rubber is the first choice for composite insulators' external insulation to improve the pollution flashover performance. It has many merits such as high hydrophobicity and transfer and recovery of the hydrophobicity, as well as the weakness such as poor aging performance because it is a kind of organic materials. Corona is one of the main factors that lead to the aging of silicone rubber. In this paper, corona aging tests of Nano-composite Room Temperature Vulcanized (RTV) and High Temperature Vulcanized (HTV) silicone rubber have been carried out. The effects of corona discharge on silicone rubber are shown with micro-analysis such as the morphology, X-ray Photoelectron Spectroscopy (XPS), and elemental components, which can help make clear what indeed happens to the silicone materials during corona aging. The results show that morphology and XPS can provide the qualitative analysis of the structural change of the silicone rubber materials caused by corona discharge, and the quantitative analysis of the elemental components before and after corona aging can indicate the chemical changes in the silicone rubber materials caused by corona discharge. The results also show that Nano-composite RTV is superior to HTV to suppress the damage from corona in the depth direction. This might be due to the contribution of Nano-composite materials.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133794107","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748206
Y. Ma, Y. Shen, L. Wang, Y. Long, C. Yao
The methods derived from Maxwell's equations can be applied to simulate very fast surge situation with specific geometry structure and compute its current distribution. The common methods are the finite difference time domain (FDTD) method, the method of moments (MoM) and so on. This paper shows a method of thin wire representation using the Antenna Design Framework Electromagnetic Satellite (ADF-EMS) software based on MoM method, which suits for the three-dimensional surge simulation. This software, as a standard numerical analysis tool on electromagnetic field around antennas and current distribution on the surface, can be applied to analyse the very fast surge phenomena. The geometry boundary problems can be solved with the electric-field integral equation, which reduces the complexity of modeling, numbers of segments and increases the accuracy. This paper indicates the basic theory of ADF-EMS and how to apply the software to solve time-domain problem with the methods of Fast Fourier Transform Algorithm (FFT) and Inverse Fast Fourier Transform (IFFT). Then the simulated in this paper and field results from literatures are compared to prove the availability of this method. These methods can be used to take a comprehensive consideration of electromagnetic field distribution and current distribution consisting of models of lightning channel, transmission tower and transmission line, which builds strong foundations for lightning current waveforms inversion calculation.
{"title":"Thin wire representation in novel computational methods","authors":"Y. Ma, Y. Shen, L. Wang, Y. Long, C. Yao","doi":"10.1109/CEIDP.2013.6748206","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748206","url":null,"abstract":"The methods derived from Maxwell's equations can be applied to simulate very fast surge situation with specific geometry structure and compute its current distribution. The common methods are the finite difference time domain (FDTD) method, the method of moments (MoM) and so on. This paper shows a method of thin wire representation using the Antenna Design Framework Electromagnetic Satellite (ADF-EMS) software based on MoM method, which suits for the three-dimensional surge simulation. This software, as a standard numerical analysis tool on electromagnetic field around antennas and current distribution on the surface, can be applied to analyse the very fast surge phenomena. The geometry boundary problems can be solved with the electric-field integral equation, which reduces the complexity of modeling, numbers of segments and increases the accuracy. This paper indicates the basic theory of ADF-EMS and how to apply the software to solve time-domain problem with the methods of Fast Fourier Transform Algorithm (FFT) and Inverse Fast Fourier Transform (IFFT). Then the simulated in this paper and field results from literatures are compared to prove the availability of this method. These methods can be used to take a comprehensive consideration of electromagnetic field distribution and current distribution consisting of models of lightning channel, transmission tower and transmission line, which builds strong foundations for lightning current waveforms inversion calculation.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115323427","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748331
R. Ghunem, Shesha H. Jayaram, E. Cherney
The paper describes a study into understanding the mechanism by which alumina tri-hydrate suppresses dry-band arcing erosion of silicone rubber under DC. Commercial silicone elastomers filled with alumina tri-hydrate to 25 and 58 wt% are exposed to the inclined plane tracking/erosion tests while simultaneously monitoring surface temperature. During the early stages of testing, a surface residue is formed, which promotes stable dry-band arcing. An earlier inception of the stable discharge, thus initiation of deep erosion at a temperature approaching 400 °C, is obtained with 25 wt% alumina tri-hydrate. A lower temperature rise is obtained for the 58 wt% filled specimens as compared to the 25 wt% filled specimens. Differential scanning calorimetry shows a larger enthalpy of dehydration for 58 wt% alumina tri-hydrate filled samples. To verify the role of dehydration on reducing the surface temperature and erosion, the erosion of liquid silicone rubber specimens is compared for samples filled with alumina tri-hydrate and silica, both at 30 wt%. As a measurement parameter, the time-to-erosion is compared between the specimens showing a reduced time for the silica filled specimens as compared to the alumina tri-hydrate filled specimens, thereby verifying the influence of the water of hydration to suppress surface temperature and erosion. The paper provides an experimental approach by which the suppression of erosion by alumina tri-hydrate can be investigated, employing simultaneous leakage current and temperature measurements.
{"title":"Suppression of erosion due to dry-band arcing under DC by alumina tri-hydrate filler in silicone rubber","authors":"R. Ghunem, Shesha H. Jayaram, E. Cherney","doi":"10.1109/CEIDP.2013.6748331","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748331","url":null,"abstract":"The paper describes a study into understanding the mechanism by which alumina tri-hydrate suppresses dry-band arcing erosion of silicone rubber under DC. Commercial silicone elastomers filled with alumina tri-hydrate to 25 and 58 wt% are exposed to the inclined plane tracking/erosion tests while simultaneously monitoring surface temperature. During the early stages of testing, a surface residue is formed, which promotes stable dry-band arcing. An earlier inception of the stable discharge, thus initiation of deep erosion at a temperature approaching 400 °C, is obtained with 25 wt% alumina tri-hydrate. A lower temperature rise is obtained for the 58 wt% filled specimens as compared to the 25 wt% filled specimens. Differential scanning calorimetry shows a larger enthalpy of dehydration for 58 wt% alumina tri-hydrate filled samples. To verify the role of dehydration on reducing the surface temperature and erosion, the erosion of liquid silicone rubber specimens is compared for samples filled with alumina tri-hydrate and silica, both at 30 wt%. As a measurement parameter, the time-to-erosion is compared between the specimens showing a reduced time for the silica filled specimens as compared to the alumina tri-hydrate filled specimens, thereby verifying the influence of the water of hydration to suppress surface temperature and erosion. The paper provides an experimental approach by which the suppression of erosion by alumina tri-hydrate can be investigated, employing simultaneous leakage current and temperature measurements.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"191 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115725997","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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