Pub Date : 2014-08-01DOI: 10.1109/ICACACT.2014.7223613
C. Vanga-Bouanga, M. Frechette, É. David
In this study, polyaniline (PAni), was used to surround Zinc Oxide (ZnO) nanoparticles to be dispersed in a High Density Polyethylene (HDPE) matrix. The dielectric properties of the composite samples were characterized using dielectric spectroscopy in a wide range of frequencies (10−2 Hz – 1 MHz) at room temperature. Interesting results were found especially for the sample containing 10 wt% of ZnO/PAni. The presence of PAni in the composite systems contributes to an increase in conductivity of two orders of magnitude. An interfacial relaxation peak was observed for all composite films and was found to shift toward higher frequency when the amount of PAni surrounding the ZnO particle increased. The thermal conductivity of HDPE-ZnO/PAni-lO 10 wt% was also greatly improved, i.e. by about 35% in comparison with that of the pure matrix.
{"title":"Dielectric response and thermal conductivity of nanostructured microcomposites: High Density Polyethylene filled with a mixture of ZnO and HCl doped polyaniline","authors":"C. Vanga-Bouanga, M. Frechette, É. David","doi":"10.1109/ICACACT.2014.7223613","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223613","url":null,"abstract":"In this study, polyaniline (PAni), was used to surround Zinc Oxide (ZnO) nanoparticles to be dispersed in a High Density Polyethylene (HDPE) matrix. The dielectric properties of the composite samples were characterized using dielectric spectroscopy in a wide range of frequencies (10−2 Hz – 1 MHz) at room temperature. Interesting results were found especially for the sample containing 10 wt% of ZnO/PAni. The presence of PAni in the composite systems contributes to an increase in conductivity of two orders of magnitude. An interfacial relaxation peak was observed for all composite films and was found to shift toward higher frequency when the amount of PAni surrounding the ZnO particle increased. The thermal conductivity of HDPE-ZnO/PAni-lO 10 wt% was also greatly improved, i.e. by about 35% in comparison with that of the pure matrix.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124877925","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223520
D. Fabiani, M. Zaccaria, A. Zucchelli, J. Belcari, O. Bocchi
This paper presents a preliminary comparison between the piezoelectric behavior of PVdF electrospun nanofibrous membranes and a commercial PVdF film. XRD measurements showed that the β phase of the realized electrospun PVdF membranes is much larger than that of the PVdF film here considered. Consequently, the nanofibrous membranes show a significant increase of the electrical response associated with a mechanical impulsive stress applied to the sample, with respect to that provided by film specimens. In particular, the electric signal per unit weight is much larger for the nanofibrous specimens, i.e. a few orders of magnitude larger than that of commercial flat specimens. This behavior could be of interest, e.g, in the field of impact sensors and energy harvesting.
{"title":"Electrospun nanofibers with piezoelectric properties","authors":"D. Fabiani, M. Zaccaria, A. Zucchelli, J. Belcari, O. Bocchi","doi":"10.1109/ICACACT.2014.7223520","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223520","url":null,"abstract":"This paper presents a preliminary comparison between the piezoelectric behavior of PVdF electrospun nanofibrous membranes and a commercial PVdF film. XRD measurements showed that the β phase of the realized electrospun PVdF membranes is much larger than that of the PVdF film here considered. Consequently, the nanofibrous membranes show a significant increase of the electrical response associated with a mechanical impulsive stress applied to the sample, with respect to that provided by film specimens. In particular, the electric signal per unit weight is much larger for the nanofibrous specimens, i.e. a few orders of magnitude larger than that of commercial flat specimens. This behavior could be of interest, e.g, in the field of impact sensors and energy harvesting.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128195266","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223618
Andreas Hopf, M. Rossner, F. Berger, U. Prucker
Sulphur hexafluoride (SF6) is the most common insulation gas in high voltage technology. Besides the excellent insulation properties SF6 has the most known global warming potential with a long lifetime in the atmosphere. Alternative insulation gases have only a fraction of the insulation level of SF6. The electric strength of gases depends on the gas density and can be increased significantly by using higher pressure. The aspirants were Nitrogen, air and N2-SF6-mixtures, with small admixture of SF6. The electron affinity of SF6 increases the dielectric strength of N2 strongly. In general the dielectric strength of SF6 is three times higher compared to air. Therefore the alternative insulation gases must set under high pressure to get equivalent dielectric strength. With regard to the practical feasibility of alternative gases influences like surface roughness, starting electron issue an inhomogeneous electric fields were included in the investigation.
{"title":"Dielectric strength of alternative insulation gases at high pressure in the inhomogeneous electric field","authors":"Andreas Hopf, M. Rossner, F. Berger, U. Prucker","doi":"10.1109/ICACACT.2014.7223618","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223618","url":null,"abstract":"Sulphur hexafluoride (SF6) is the most common insulation gas in high voltage technology. Besides the excellent insulation properties SF6 has the most known global warming potential with a long lifetime in the atmosphere. Alternative insulation gases have only a fraction of the insulation level of SF6. The electric strength of gases depends on the gas density and can be increased significantly by using higher pressure. The aspirants were Nitrogen, air and N2-SF6-mixtures, with small admixture of SF6. The electron affinity of SF6 increases the dielectric strength of N2 strongly. In general the dielectric strength of SF6 is three times higher compared to air. Therefore the alternative insulation gases must set under high pressure to get equivalent dielectric strength. With regard to the practical feasibility of alternative gases influences like surface roughness, starting electron issue an inhomogeneous electric fields were included in the investigation.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"2008 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128215766","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223553
A. Vouk, G. Stone
For large high-voltage motors it has been shown that there is a consistent relationship between motor Partial Discharge (PD) measurements recorded in Volts to PD measurements recorded in Coulombs, both measured quickly in succession [6,7,10]. This relationship, the ratio of PD measured in volts to PD measured in Coulombs, is expressed in a transformation factor called the F-factor. It appears that the F factor can be predicted based on core dimensions and insulation thickness and this paper examines if the F-factor can be directly related to the surge impedance of the winding. This paper also compares the F-factor to insulation design electric stress and a suggested rational is proposed for being able to predict the F factor based on stator physical data. In our experience an excessive insulation design electric stress degrades the integrity of a machine.
{"title":"Applying the PD F-factor to verify the integrity of large motor stator insulation design","authors":"A. Vouk, G. Stone","doi":"10.1109/ICACACT.2014.7223553","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223553","url":null,"abstract":"For large high-voltage motors it has been shown that there is a consistent relationship between motor Partial Discharge (PD) measurements recorded in Volts to PD measurements recorded in Coulombs, both measured quickly in succession [6,7,10]. This relationship, the ratio of PD measured in volts to PD measured in Coulombs, is expressed in a transformation factor called the F-factor. It appears that the F factor can be predicted based on core dimensions and insulation thickness and this paper examines if the F-factor can be directly related to the surge impedance of the winding. This paper also compares the F-factor to insulation design electric stress and a suggested rational is proposed for being able to predict the F factor based on stator physical data. In our experience an excessive insulation design electric stress degrades the integrity of a machine.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130510284","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223483
B. Qi, Yilong Chen, Chengrong Li, C. Gao, Linjie Zhao, Xiaqing Sun
Under AC/DC combined electric field, the oil-pressboard insulation of the converter transformer accumulates space charges to generate a partially distorted non-uniform field and thus affects the electric strength distribution of the insulation system. The present research uses the needle-plate electrode to simulate the distorted non-uniform electric field fostered by the space charges and adopts the electrostatic capacitive probe method to record the changing patterns of the interface charges in the AC/DC combined electric field, and studies the impact of interface charges on flashover voltage, aiming at providing concrete references for the design of converter transformer. The research results indicate that, under AC/DC combined electric field where the ratios between AC voltage equivalent value and the DC voltage are recorded as 1∶1 and 1∶5, the interface charges accumulated at the upper layer of the pressboard in the non-uniform electric field possess the same polarity as that of the DC proportion in the applied voltage complex. The charge density under the combined electric field superimposed by AC on negative DC voltage appears larger than that in the context of the positive DC voltage. The interface charge density increases with the duration of voltage application and also fluctuates with the AC instantaneous field in the similar manner as power frequency voltage. The larger the DC proportion in the combined electric field, the less the fluctuation appears. Due to the reverse effect of the homopolar charges to the electric field, the surface flashover voltage in the combined electric field superimposed by AC voltage on the negative DC voltage is 1.3 times greater than that in the scenario of positive DC voltage.
{"title":"Oil-pressboard interface charges under combined AC/DC electric field: Their characteristics and influence on surface flashover voltage","authors":"B. Qi, Yilong Chen, Chengrong Li, C. Gao, Linjie Zhao, Xiaqing Sun","doi":"10.1109/ICACACT.2014.7223483","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223483","url":null,"abstract":"Under AC/DC combined electric field, the oil-pressboard insulation of the converter transformer accumulates space charges to generate a partially distorted non-uniform field and thus affects the electric strength distribution of the insulation system. The present research uses the needle-plate electrode to simulate the distorted non-uniform electric field fostered by the space charges and adopts the electrostatic capacitive probe method to record the changing patterns of the interface charges in the AC/DC combined electric field, and studies the impact of interface charges on flashover voltage, aiming at providing concrete references for the design of converter transformer. The research results indicate that, under AC/DC combined electric field where the ratios between AC voltage equivalent value and the DC voltage are recorded as 1∶1 and 1∶5, the interface charges accumulated at the upper layer of the pressboard in the non-uniform electric field possess the same polarity as that of the DC proportion in the applied voltage complex. The charge density under the combined electric field superimposed by AC on negative DC voltage appears larger than that in the context of the positive DC voltage. The interface charge density increases with the duration of voltage application and also fluctuates with the AC instantaneous field in the similar manner as power frequency voltage. The larger the DC proportion in the combined electric field, the less the fluctuation appears. Due to the reverse effect of the homopolar charges to the electric field, the surface flashover voltage in the combined electric field superimposed by AC voltage on the negative DC voltage is 1.3 times greater than that in the scenario of positive DC voltage.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126756927","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223484
B. Qi, Zongwang Zhu, Hong-xin Ji, Chengrong Li, Linjie Zhao, Ruihai Li
Partial discharge (PD) level under the specified AC/DC test voltages, which is one key parameter indicating the insulation reliability of ultra-high voltage direct current (UHVDC) converter transformers, do not often be accurately determined due to the impact of the external electromagnetic interference. To solve this problem, a method that uses the ultra-high frequency (UHF) technology to monitor the PD interferences was brought forward in this paper, and was applied to the factory tests of a ± 800kV converter transformer. The results show that the waveform characteristic of the UHF detection signals can be well used for recognizing the interferences caused by communication equipment, as well as the phase distribution characteristics of the UHF detection signals for the floating potential discharge and the point discharge induced by various types of AC / DC test voltages. The results also confirm that the floating discharge spots and the point discharge spots can be quickly and accurately located by analyzing the arriving time difference of RF signals at the different sensors of the UHF antenna array. Based on the monitoring results, the PD interference sources were well treated and then the ± 800kV converter transformer smoothly passed the partial discharge measurements. The research results will be further deployed to the similar work of the UHVDC converter transformers in the converter stations.
{"title":"Interference monitoring during the factory PD tests of ±800kV converter transformer","authors":"B. Qi, Zongwang Zhu, Hong-xin Ji, Chengrong Li, Linjie Zhao, Ruihai Li","doi":"10.1109/ICACACT.2014.7223484","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223484","url":null,"abstract":"Partial discharge (PD) level under the specified AC/DC test voltages, which is one key parameter indicating the insulation reliability of ultra-high voltage direct current (UHVDC) converter transformers, do not often be accurately determined due to the impact of the external electromagnetic interference. To solve this problem, a method that uses the ultra-high frequency (UHF) technology to monitor the PD interferences was brought forward in this paper, and was applied to the factory tests of a ± 800kV converter transformer. The results show that the waveform characteristic of the UHF detection signals can be well used for recognizing the interferences caused by communication equipment, as well as the phase distribution characteristics of the UHF detection signals for the floating potential discharge and the point discharge induced by various types of AC / DC test voltages. The results also confirm that the floating discharge spots and the point discharge spots can be quickly and accurately located by analyzing the arriving time difference of RF signals at the different sensors of the UHF antenna array. Based on the monitoring results, the PD interference sources were well treated and then the ± 800kV converter transformer smoothly passed the partial discharge measurements. The research results will be further deployed to the similar work of the UHVDC converter transformers in the converter stations.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125725635","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223542
F. Espino-cortes, T. Asiaín-Olivares, P. Gómez
The high electric field present along the stress grading (SG) coatings in coil ends of medium voltage rotating machines fed by adjustable speed drives (ASD) can lead to surface discharge and an increased resistive heating. Previous works had shown that the analysis of SG coatings for coil ends in motors working with ASD requires consideration of the effect of the conductive armor coating. Usually the design of the conductive armor coating (CAT) and the SG coatings is done separately; however, it is important to understand the combined performance of both coatings, especially under pulse width modulated (PWM) waveforms. With this purpose, transient finite element method (FEM) was used to analyze how changes in the conductivity of the CAT modify the electric field and resistive heat density along both coatings for multilevel PWM waveforms. According with the results, the increment of the CAT conductivity reduces the maximum heat and maximum electric field in the CAT; however, a change in the properties of the SG coating can be required to avoid transferring the problem to this coating, either for three or five levels PWM waveforms.
{"title":"Simulation of the effect of armor coating conductivity on the stress grading coating performance under PWM multilevel waveforms","authors":"F. Espino-cortes, T. Asiaín-Olivares, P. Gómez","doi":"10.1109/ICACACT.2014.7223542","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223542","url":null,"abstract":"The high electric field present along the stress grading (SG) coatings in coil ends of medium voltage rotating machines fed by adjustable speed drives (ASD) can lead to surface discharge and an increased resistive heating. Previous works had shown that the analysis of SG coatings for coil ends in motors working with ASD requires consideration of the effect of the conductive armor coating. Usually the design of the conductive armor coating (CAT) and the SG coatings is done separately; however, it is important to understand the combined performance of both coatings, especially under pulse width modulated (PWM) waveforms. With this purpose, transient finite element method (FEM) was used to analyze how changes in the conductivity of the CAT modify the electric field and resistive heat density along both coatings for multilevel PWM waveforms. According with the results, the increment of the CAT conductivity reduces the maximum heat and maximum electric field in the CAT; however, a change in the properties of the SG coating can be required to avoid transferring the problem to this coating, either for three or five levels PWM waveforms.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121197025","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223605
Hong-Tu Song, G. Ma, Jun Jiang, Cheng-Rong Li, Ying-Ting Luo, Hong-Bin Wang
A novel sensor used in detection of hydrogen concentration dissolved in transformer oil was proposed based on fiber Bragg grating (FBG). Palladium was introduced as hydrogen sensitive material and silver was alloyed to improve permeability in hydrogen sensitive layer. Meanwhile membrane of titanium was fabricated for enhancing the adhesion between fiber and hydrogen sensitive layer. The thin film on FBG was coated with magnetron sputtering. A novel sensor that was wavelength-sensitive to hydrogen dissolved in oil was fabricated and the experimental platform was set up in this paper. The sensitivity of the sensor was tested in transformer oil at 80 °C which was typically high operating temperature or local overheating temperature of power transformers. The experimental result demonstrated that the sensor performed well at low hydrogen concentration of 323 µL/L and the sensitivity of sensor was as high as 24.4 µL/L at every 1pm wavelength shift.
{"title":"Dissolved hydrogen measurement with palladium-silver FBG sensor in transformer oil","authors":"Hong-Tu Song, G. Ma, Jun Jiang, Cheng-Rong Li, Ying-Ting Luo, Hong-Bin Wang","doi":"10.1109/ICACACT.2014.7223605","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223605","url":null,"abstract":"A novel sensor used in detection of hydrogen concentration dissolved in transformer oil was proposed based on fiber Bragg grating (FBG). Palladium was introduced as hydrogen sensitive material and silver was alloyed to improve permeability in hydrogen sensitive layer. Meanwhile membrane of titanium was fabricated for enhancing the adhesion between fiber and hydrogen sensitive layer. The thin film on FBG was coated with magnetron sputtering. A novel sensor that was wavelength-sensitive to hydrogen dissolved in oil was fabricated and the experimental platform was set up in this paper. The sensitivity of the sensor was tested in transformer oil at 80 °C which was typically high operating temperature or local overheating temperature of power transformers. The experimental result demonstrated that the sensor performed well at low hydrogen concentration of 323 µL/L and the sensitivity of sensor was as high as 24.4 µL/L at every 1pm wavelength shift.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122917337","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223599
Hamed Janani, N. Jacob, B. Kordi
This paper presents an application of pattern recognition techniques for identification of partial discharge sources in oil-immersed insulation. Three sources of partial discharge are simulated to generate artificial partial discharge data; bubble wrap to simulate air bubbles, needle to simulate corona discharge, and metal particles. Fingerprints from phase resolved partial discharge patterns are extracted. Dimension reduction techniques are employed to reduce the size of the collected data. Two classifiers (k Nearest Neighbor and Support Vector Machine) are developed for partial discharge source identification. The results show that the proposed classifiers are well able to identify the sources of partial discharge.
{"title":"Automated recognition of partial discharge in oil-immersed insulation","authors":"Hamed Janani, N. Jacob, B. Kordi","doi":"10.1109/ICACACT.2014.7223599","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223599","url":null,"abstract":"This paper presents an application of pattern recognition techniques for identification of partial discharge sources in oil-immersed insulation. Three sources of partial discharge are simulated to generate artificial partial discharge data; bubble wrap to simulate air bubbles, needle to simulate corona discharge, and metal particles. Fingerprints from phase resolved partial discharge patterns are extracted. Dimension reduction techniques are employed to reduce the size of the collected data. Two classifiers (k Nearest Neighbor and Support Vector Machine) are developed for partial discharge source identification. The results show that the proposed classifiers are well able to identify the sources of partial discharge.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131433408","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223509
Chenglong Zhao, Mingxi Zhu, H. Mei, Li-ming Wang, Z. Guan
Silicone rubber materials have been widely used as external insulation for power systems due to their good hydrophobicity and hydrophobicity transfer. However, pollution flashover accidents of composite insulators occurred from time to time in recent years. The influence of environmental condition on hydrophobicity and hydrophobicity transfer property of silicone rubber material needs further research. In this paper, incubator and saturated salt solution were used respectively to control ambient temperature and humidity precisely. Hydrophobicity measurement method were studied and regulated. Using incubator and special temperature control platform, hydrophobicity transfer property of silicone rubber material in different temperature was deeply studied, and the results were analyzed. The results showed that hydrophobicity transfer speed of silicone rubber slowed down with temperature decreased. Meanwhile, the results showed that ambient humidity had a great influence on hydrophobicity transfer property of silicone rubber. Flashover performance of silicone rubber samples with different hydrophobicity was analyzed. The results showed that the pollution flashover performance of composite insulators is closely related to the hydrophobicity state of the polluted surface.
{"title":"Influence of environmental factors on hydrophobicity transfer property of silicone rubber material","authors":"Chenglong Zhao, Mingxi Zhu, H. Mei, Li-ming Wang, Z. Guan","doi":"10.1109/ICACACT.2014.7223509","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223509","url":null,"abstract":"Silicone rubber materials have been widely used as external insulation for power systems due to their good hydrophobicity and hydrophobicity transfer. However, pollution flashover accidents of composite insulators occurred from time to time in recent years. The influence of environmental condition on hydrophobicity and hydrophobicity transfer property of silicone rubber material needs further research. In this paper, incubator and saturated salt solution were used respectively to control ambient temperature and humidity precisely. Hydrophobicity measurement method were studied and regulated. Using incubator and special temperature control platform, hydrophobicity transfer property of silicone rubber material in different temperature was deeply studied, and the results were analyzed. The results showed that hydrophobicity transfer speed of silicone rubber slowed down with temperature decreased. Meanwhile, the results showed that ambient humidity had a great influence on hydrophobicity transfer property of silicone rubber. Flashover performance of silicone rubber samples with different hydrophobicity was analyzed. The results showed that the pollution flashover performance of composite insulators is closely related to the hydrophobicity state of the polluted surface.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"15 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131493848","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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