Pub Date : 2011-10-01DOI: 10.1109/CEIDP.2011.6232681
B. Du, X. X. Cheng, Z. L. Ma, K. Wu
The hydrophobicity evaluation for polymer insulators continues to be a prominent characteristic. For the purpose of evaluating the hydrophobicity of polymer insulator, a VHF antenna was utilized to receive high frequency electromagnetic signals, which were induced during the surface discharge on the sample surface. The wavelet theory was applied to analyze the electromagnetic signals that were processed by signal-processing system. The obtained 3-D images of surface discharge, which contains the frequency, the time and the amplitude, can figure out the hydrophobicity of polymer insulator with different ageing time efficiently. Based on 3-D images, 2-D contour line spectra were set up for investigating the complexity of discharge. The fractal dimensions of 2-D spectra and lacunarity were computed to assess the severity of surface discharge quantificationally. It is found that the series of methods using PD-induced electromagnetic wave can efficiently recognize the characteristics the discharge on the surface of insulators, which can be utilized to evaluate the hydrophobicity of polymer insulators.
{"title":"Hydrophobicity evaluation of polymer insulator based on surface discharge characteristics","authors":"B. Du, X. X. Cheng, Z. L. Ma, K. Wu","doi":"10.1109/CEIDP.2011.6232681","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232681","url":null,"abstract":"The hydrophobicity evaluation for polymer insulators continues to be a prominent characteristic. For the purpose of evaluating the hydrophobicity of polymer insulator, a VHF antenna was utilized to receive high frequency electromagnetic signals, which were induced during the surface discharge on the sample surface. The wavelet theory was applied to analyze the electromagnetic signals that were processed by signal-processing system. The obtained 3-D images of surface discharge, which contains the frequency, the time and the amplitude, can figure out the hydrophobicity of polymer insulator with different ageing time efficiently. Based on 3-D images, 2-D contour line spectra were set up for investigating the complexity of discharge. The fractal dimensions of 2-D spectra and lacunarity were computed to assess the severity of surface discharge quantificationally. It is found that the series of methods using PD-induced electromagnetic wave can efficiently recognize the characteristics the discharge on the surface of insulators, which can be utilized to evaluate the hydrophobicity of polymer insulators.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"15 1","pages":"407-410"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87784658","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232736
A. Strauchs, A. Schnettler
The present study focuses on inner interface modifications and matrix modifications to improve the electrical and mechanical properties of epoxy resin based syntactic foam during production process and lifetime. Silane-coated hollow microspheres are used to modify the interfaces between microspheres and epoxy resin, and SiO2 nanofiller is used to modify the matrix. Electrical investigations show a positive impact of the silane-coating on the ac and dc breakdown field strength. Mechanical investigations show an increased mechanical strength of the material due to an improved adhesion quality between microspheres and epoxy resin. The nanofillers show no significant influence on the properties of the cured syntactic foam. However, it is verified that nanofillers reduce the viscosity of the uncured, liquid material. This provides a better production quality of the material at high microspheres' filling degrees.
{"title":"Enhancements of epoxy resin based syntactic foam by inner interface and matrix modifications","authors":"A. Strauchs, A. Schnettler","doi":"10.1109/CEIDP.2011.6232736","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232736","url":null,"abstract":"The present study focuses on inner interface modifications and matrix modifications to improve the electrical and mechanical properties of epoxy resin based syntactic foam during production process and lifetime. Silane-coated hollow microspheres are used to modify the interfaces between microspheres and epoxy resin, and SiO2 nanofiller is used to modify the matrix. Electrical investigations show a positive impact of the silane-coating on the ac and dc breakdown field strength. Mechanical investigations show an increased mechanical strength of the material due to an improved adhesion quality between microspheres and epoxy resin. The nanofillers show no significant influence on the properties of the cured syntactic foam. However, it is verified that nanofillers reduce the viscosity of the uncured, liquid material. This provides a better production quality of the material at high microspheres' filling degrees.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"482 1","pages":"632-635"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85773730","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232695
E. Sili, F. Koliatene, J. Cambronne
In aircraft applications according to the nature of electrical equipment, its location may be in unpressurized area; thus the environment conditions may change from atmospheric pressure to less than 100 mbar, and the temperature may vary up to 180°C near the aircraft engine. Since all these parameters may affect the discharge ignition voltage, the classical paschen curve has to be replotted according to these parameters. In this paper we firstly investigated the domain of validity of two corrective expressions on the paschen's law found in the literature, in case of changing the air environment: Peek and Dunbar corrections. After that, the effect of the low pressure combined to high temperature on the breakdown voltage at the left of the Paschen minimum has been investigated. Results show two different behaviours of Paschen curve related to temperature and pressure that can be explained by the variation of the breakdown mechanisms, and supported by measuring the energy dissipated in the electric discharge by means of the Lissajous figures at different conditions. Consequently, it was demonstrated that the electrical breakdown in gases occurs due to the gas or vacuum mechanism managed by the temperature and/or the pressure.
{"title":"Pressure and temperature effects on the paschen curve","authors":"E. Sili, F. Koliatene, J. Cambronne","doi":"10.1109/CEIDP.2011.6232695","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232695","url":null,"abstract":"In aircraft applications according to the nature of electrical equipment, its location may be in unpressurized area; thus the environment conditions may change from atmospheric pressure to less than 100 mbar, and the temperature may vary up to 180°C near the aircraft engine. Since all these parameters may affect the discharge ignition voltage, the classical paschen curve has to be replotted according to these parameters. In this paper we firstly investigated the domain of validity of two corrective expressions on the paschen's law found in the literature, in case of changing the air environment: Peek and Dunbar corrections. After that, the effect of the low pressure combined to high temperature on the breakdown voltage at the left of the Paschen minimum has been investigated. Results show two different behaviours of Paschen curve related to temperature and pressure that can be explained by the variation of the breakdown mechanisms, and supported by measuring the energy dissipated in the electric discharge by means of the Lissajous figures at different conditions. Consequently, it was demonstrated that the electrical breakdown in gases occurs due to the gas or vacuum mechanism managed by the temperature and/or the pressure.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"13 1","pages":"464-467"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85878839","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232702
F. Guastavino, E. Torello, S. Squarcia, A. Dardano, M. Secci, F. Ferraro, D. Pistone
This work presents a systematic experimental campaign about the recognition, the morphological analysis and the diagnosis of defects inside the mass insulation of medium voltage current transformers. Different kinds of common defects (voids, delaminations, etc.) have been intentionally produced inside the mass insulation and on the surface of the test objects. External influence parameters, such as surface pollution, have been taken. All the sample test pieces are subjected to several PD tests and the relevant acquired data are stored and processed. The outcome evidences that digital PD acquisitions may allow to efficiently spot the defects and to identify their morphology.
{"title":"Morphologic analysis and diagnosis of defects inside cast resin medium voltage current transformers insulation by digital partial discharges acquisitions","authors":"F. Guastavino, E. Torello, S. Squarcia, A. Dardano, M. Secci, F. Ferraro, D. Pistone","doi":"10.1109/CEIDP.2011.6232702","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232702","url":null,"abstract":"This work presents a systematic experimental campaign about the recognition, the morphological analysis and the diagnosis of defects inside the mass insulation of medium voltage current transformers. Different kinds of common defects (voids, delaminations, etc.) have been intentionally produced inside the mass insulation and on the surface of the test objects. External influence parameters, such as surface pollution, have been taken. All the sample test pieces are subjected to several PD tests and the relevant acquired data are stored and processed. The outcome evidences that digital PD acquisitions may allow to efficiently spot the defects and to identify their morphology.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"2 1","pages":"493-496"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86593727","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232675
A. Krivda, B. Singh, M. Carlen, T. Hartmann, S. Schaal, P. Mahonen, H. Le, S. Tzavalas
In this work we summarize the results of long-term ageing of different medium voltage outdoor power equipment in an artificial climatic chamber and compare them with the results obtained at a natural ageing site at the Koeberg Insulator Pollution Test Station near Cape Town, South Africa. The results show that by correctly adjusting the ageing cycle consisting of UV radiation, heat, clean and salt fog it is possible to age power equipment at an accelerated rate (a factor of 5 and greater) and obtain the same type of damage (UV damage, tracking and erosion due to surface discharges, cracking) as observed at the natural ageing site. Although many different types of outdoor power equipment will still have to be tested, the first results based on epoxy insulated power equipment are encouraging.
{"title":"Accelerated testing of outdoor power equipment","authors":"A. Krivda, B. Singh, M. Carlen, T. Hartmann, S. Schaal, P. Mahonen, H. Le, S. Tzavalas","doi":"10.1109/CEIDP.2011.6232675","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232675","url":null,"abstract":"In this work we summarize the results of long-term ageing of different medium voltage outdoor power equipment in an artificial climatic chamber and compare them with the results obtained at a natural ageing site at the Koeberg Insulator Pollution Test Station near Cape Town, South Africa. The results show that by correctly adjusting the ageing cycle consisting of UV radiation, heat, clean and salt fog it is possible to age power equipment at an accelerated rate (a factor of 5 and greater) and obtain the same type of damage (UV damage, tracking and erosion due to surface discharges, cracking) as observed at the natural ageing site. Although many different types of outdoor power equipment will still have to be tested, the first results based on epoxy insulated power equipment are encouraging.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"20 1","pages":"381-386"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76046681","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232691
O. Kvien, G. Berg, S. Hvidsten
The main aim of this work has been to test the long term durability of insulation materials subjected to surface partial discharges (PD), as a part of a larger study on the performance of materials used in subsea high voltage apparatus. Electrical equipment used in subsea installations are subjected to high hydrostatic pressures and seawater, often combined with high temperatures and even reactive chemical environments, making new challenges for the materials involved. The test method used for PD-testing is based on the Cigré II method. The method has been used in dry and humid conditions to identify the effect of humidity on the degradation of insulation materials subjected to PD relevant for subsea applications. The insulation materials samples were 2 millimeter thick disks of POM (polyoxymethylene) and XLPE (cross-linked homo-polymer polyethylene). The samples where subjected to surface discharges in a 1 mm sphere-to-plane electrode gap. The results show that the humidity during testing had a significant impact on material erosion and material transport in the electrode gap. POM was more rapidly degraded by PD than XLPE.
{"title":"Material erosion and build-up at the high voltage electrode during PD testing of subsea insulation materials using a modified Cigré II test method","authors":"O. Kvien, G. Berg, S. Hvidsten","doi":"10.1109/CEIDP.2011.6232691","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232691","url":null,"abstract":"The main aim of this work has been to test the long term durability of insulation materials subjected to surface partial discharges (PD), as a part of a larger study on the performance of materials used in subsea high voltage apparatus. Electrical equipment used in subsea installations are subjected to high hydrostatic pressures and seawater, often combined with high temperatures and even reactive chemical environments, making new challenges for the materials involved. The test method used for PD-testing is based on the Cigré II method. The method has been used in dry and humid conditions to identify the effect of humidity on the degradation of insulation materials subjected to PD relevant for subsea applications. The insulation materials samples were 2 millimeter thick disks of POM (polyoxymethylene) and XLPE (cross-linked homo-polymer polyethylene). The samples where subjected to surface discharges in a 1 mm sphere-to-plane electrode gap. The results show that the humidity during testing had a significant impact on material erosion and material transport in the electrode gap. POM was more rapidly degraded by PD than XLPE.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"87 1","pages":"448-451"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78959336","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232761
D. Mary, D. Malec, M. Q. Nguyen, P. Werynski, B. Gornicka
Results of DC breakdown strength of pure, nanoscale-filled and microscale-filled PEI varnishes are described and analyzed in this communication. Silica (10nm and 400nm) has been used as a filler to increase the lifetime of such varnishes submitted to a partial discharge activity (varnish to be used in rotating machines fed by inverters). Experimental results have shown that both dielectric strength and conduction current are affected by the fillers. The higher the conduction current, the lower the DC breakdown strength. The modelling has consequently been focused on the thermal breakdown theory to explain these experimental data.
{"title":"Measurement and modelling of the DC dielectric strength of pure, nanofilled and microfilled polyetherimide resin","authors":"D. Mary, D. Malec, M. Q. Nguyen, P. Werynski, B. Gornicka","doi":"10.1109/CEIDP.2011.6232761","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232761","url":null,"abstract":"Results of DC breakdown strength of pure, nanoscale-filled and microscale-filled PEI varnishes are described and analyzed in this communication. Silica (10nm and 400nm) has been used as a filler to increase the lifetime of such varnishes submitted to a partial discharge activity (varnish to be used in rotating machines fed by inverters). Experimental results have shown that both dielectric strength and conduction current are affected by the fillers. The higher the conduction current, the lower the DC breakdown strength. The modelling has consequently been focused on the thermal breakdown theory to explain these experimental data.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"34 1","pages":"736-739"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76400495","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232763
F. Guerbas, A. Boubakeur, A. Beroual
In this paper we present results of carried out investigations on the influence of insulating barriers on AC prebreakdown current of long point-plane transformer oil gaps up to 12cm. The insertion of an insulating barrier leads to an important prebreakdown current decrease. The barrier acts as a geometrical and electrostatic obstacle for the disruptive discharge. We present in the paper a comparison between the prebreakdown current in the system with barrier to that one without barrier. We have considered the parameters of the barrier such as its position between the electrodes, and its nature. We observe that the evolution of the pre-breakdown current versus the applied voltage has a capacitive behavior. The equivalent impedance of the oil gap is deduced from the experimental current-voltage characteristics.
{"title":"Pre-breakdown current in long point-plane transformer oil gaps with insulating barrier under AC voltage","authors":"F. Guerbas, A. Boubakeur, A. Beroual","doi":"10.1109/CEIDP.2011.6232763","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232763","url":null,"abstract":"In this paper we present results of carried out investigations on the influence of insulating barriers on AC prebreakdown current of long point-plane transformer oil gaps up to 12cm. The insertion of an insulating barrier leads to an important prebreakdown current decrease. The barrier acts as a geometrical and electrostatic obstacle for the disruptive discharge. We present in the paper a comparison between the prebreakdown current in the system with barrier to that one without barrier. We have considered the parameters of the barrier such as its position between the electrodes, and its nature. We observe that the evolution of the pre-breakdown current versus the applied voltage has a capacitive behavior. The equivalent impedance of the oil gap is deduced from the experimental current-voltage characteristics.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"29 1","pages":"744-747"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88368701","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232604
J. Crine
In the proposed model, one broken C-C bond is surrounded by a volume ΔV of stressed molecules and by a volume δv of strained molecules. These volumes could be depicted as the volumes in which the deformed molecules relax following the disturbance associated with the bond breaking. Both parameters are decreasing exponentially with time under constant field application. However, the time scales for the bonds breaking and for the molecular relaxations are not the same. When the energy barrier is calculated as a function of time for different fields and sample size, it appears that it is oscillating with time. Interestingly, the frequency of the oscillations is identical to the oscillations of wave packets observed in space charge measurements under the same experimental conditions. The influence of all contributing parameters is discussed and it is concluded that oscillations exist under all fields above the critical (threshold) field but at low fields, the time of appearance of the first one could be so long that it has never been recorded. The significance and implications of this phenomenon are briefly discussed.
{"title":"Time evolution of the activation energy and volumes in electrical aging and wave packets in PE","authors":"J. Crine","doi":"10.1109/CEIDP.2011.6232604","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232604","url":null,"abstract":"In the proposed model, one broken C-C bond is surrounded by a volume ΔV of stressed molecules and by a volume δv of strained molecules. These volumes could be depicted as the volumes in which the deformed molecules relax following the disturbance associated with the bond breaking. Both parameters are decreasing exponentially with time under constant field application. However, the time scales for the bonds breaking and for the molecular relaxations are not the same. When the energy barrier is calculated as a function of time for different fields and sample size, it appears that it is oscillating with time. Interestingly, the frequency of the oscillations is identical to the oscillations of wave packets observed in space charge measurements under the same experimental conditions. The influence of all contributing parameters is discussed and it is concluded that oscillations exist under all fields above the critical (threshold) field but at low fields, the time of appearance of the first one could be so long that it has never been recorded. The significance and implications of this phenomenon are briefly discussed.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"36 1","pages":"93-96"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91383955","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232781
Y. Fujii, Y. Muramoto, N. Shimizu
Electric double layer (EDL) is a kind of interfacial phenomenon. The Phenomenon is known to have huge capacitance. The purpose of the present study is analysis of behavior of ions in electric double layer. For this purpose, we measured capacitance of EDL in 5 wt% NaCl solution at room temperature using step voltage and ramp voltage. We also observed characteristics of EDL at low temperature. We obtained following results. The capacitance by the ramp voltage is about ten times larger than that by the step voltage. EDL is kept in frozen NaCl solution after short-circuiting. Capacitance of frozen EDL is larger than that of liquid EDL at room temperature.
{"title":"Behavior of ions in electric double layer","authors":"Y. Fujii, Y. Muramoto, N. Shimizu","doi":"10.1109/CEIDP.2011.6232781","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232781","url":null,"abstract":"Electric double layer (EDL) is a kind of interfacial phenomenon. The Phenomenon is known to have huge capacitance. The purpose of the present study is analysis of behavior of ions in electric double layer. For this purpose, we measured capacitance of EDL in 5 wt% NaCl solution at room temperature using step voltage and ramp voltage. We also observed characteristics of EDL at low temperature. We obtained following results. The capacitance by the ramp voltage is about ten times larger than that by the step voltage. EDL is kept in frozen NaCl solution after short-circuiting. Capacitance of frozen EDL is larger than that of liquid EDL at room temperature.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"11 1","pages":"816-819"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86912196","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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