At present, the oil-paper insulation structure is mainly composed of traditional mineral oil and cellulose insulation paper. The hots pot of future research is to select better insulation oil to improve the overall insulation life of the system. Compared with traditional mineral insulation oil, gas to liquid(GTL) oil made from base oil refined by natural gas liquefaction technology by Fischer-Tropsch(FT) method are characterized by high oxidative stability and low sulfur content. In this paper, the space charge accumulation, distribution and attenuation characteristics of oil-impregnated paper composed of GTL oil and traditional mineral oil were studied. The space trap energy level and trap density distribution of two oil-impregnated papers were obtained according to isothermal decay current(IDC) method. The experimental results show that in the voltage-on stage, traditional mineral oil-impregnated paper is more prone to charge injection and the injection speed is faster. In the voltage-off stage, the traditional mineral oil-impregnated paper attenuates the charge faster, and the GTL oil-impregnated paper has more residual charge. Moreover, the trap level of GTL oil-impregnated paper is deeper than that of traditional mineral oil-impregnated paper.
{"title":"Effect of Insulating Oil on Space Charge Characteristics of Oil-impregnated Paper Under DC Voltage","authors":"Ganlin Mao, Shengtao Li, Shijun Li, Zhao Ge, Liuqing Yang, Liuhao Jiang","doi":"10.1109/ICD46958.2020.9341880","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341880","url":null,"abstract":"At present, the oil-paper insulation structure is mainly composed of traditional mineral oil and cellulose insulation paper. The hots pot of future research is to select better insulation oil to improve the overall insulation life of the system. Compared with traditional mineral insulation oil, gas to liquid(GTL) oil made from base oil refined by natural gas liquefaction technology by Fischer-Tropsch(FT) method are characterized by high oxidative stability and low sulfur content. In this paper, the space charge accumulation, distribution and attenuation characteristics of oil-impregnated paper composed of GTL oil and traditional mineral oil were studied. The space trap energy level and trap density distribution of two oil-impregnated papers were obtained according to isothermal decay current(IDC) method. The experimental results show that in the voltage-on stage, traditional mineral oil-impregnated paper is more prone to charge injection and the injection speed is faster. In the voltage-off stage, the traditional mineral oil-impregnated paper attenuates the charge faster, and the GTL oil-impregnated paper has more residual charge. Moreover, the trap level of GTL oil-impregnated paper is deeper than that of traditional mineral oil-impregnated paper.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"51 1","pages":"443-446"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75709243","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341818
Amirhossein Mahtabani, I. Rytöluoto, R. Anyszka, Eetta Saarimäki, Xiaozhen He, K. Lahti, M. Paajanen, W. Dierkes, A. Blume
Functionalization of silica nanoparticles with polar aminosilane and its effect on space charge accumulation under high voltage direct current (DC) was studied in polypropylene (PP)/ Ethylene-Octene Copolymer (EOC) /silica nanodielectrics. The modification reaction conditions were varied in order to alter the deposited layer grafting density and morphology, and hence, the filler-polymer interfacial properties. The effect of this alteration was then studied on the space charge accumulation under a high DC field as one of the most important properties to tune for HVDC cable insulation systems. The chemical modification of the silica surface was first confirmed via Thermogravimetric Analysis (TGA) and Fourier Transform IR Spectroscopy (FTIR). Differential Scanning Calorimetry (DSC) was performed on the nanocomposites to study the effect of the nano-engineered interfacial areas on nucleation and crystal formation. The effect of the amine functional groups on the charge carrier trapping and transport in this insulation system was studied via Thermally Stimulated Depolarization Current (TSDC) method.It was argued that the amine functionality on the silica surface can induce deep trap states at the filler-polymer interfaces, and hinder further injection of the space charge. Under certain modification conditions, the aminosilane can form “island-like” structures on the silica surface. These islands can both facilitate nucleation, inducing transcrystallization at the filler-polymer interface, and further contribute to the induction of deep traps which result in reduction of space charge accumulation in the nanodielectric.
{"title":"Silica Functionalization: How Does it Affect Space Charge Accumulation in Nanodielectrics Under DC?","authors":"Amirhossein Mahtabani, I. Rytöluoto, R. Anyszka, Eetta Saarimäki, Xiaozhen He, K. Lahti, M. Paajanen, W. Dierkes, A. Blume","doi":"10.1109/ICD46958.2020.9341818","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341818","url":null,"abstract":"Functionalization of silica nanoparticles with polar aminosilane and its effect on space charge accumulation under high voltage direct current (DC) was studied in polypropylene (PP)/ Ethylene-Octene Copolymer (EOC) /silica nanodielectrics. The modification reaction conditions were varied in order to alter the deposited layer grafting density and morphology, and hence, the filler-polymer interfacial properties. The effect of this alteration was then studied on the space charge accumulation under a high DC field as one of the most important properties to tune for HVDC cable insulation systems. The chemical modification of the silica surface was first confirmed via Thermogravimetric Analysis (TGA) and Fourier Transform IR Spectroscopy (FTIR). Differential Scanning Calorimetry (DSC) was performed on the nanocomposites to study the effect of the nano-engineered interfacial areas on nucleation and crystal formation. The effect of the amine functional groups on the charge carrier trapping and transport in this insulation system was studied via Thermally Stimulated Depolarization Current (TSDC) method.It was argued that the amine functionality on the silica surface can induce deep trap states at the filler-polymer interfaces, and hinder further injection of the space charge. Under certain modification conditions, the aminosilane can form “island-like” structures on the silica surface. These islands can both facilitate nucleation, inducing transcrystallization at the filler-polymer interface, and further contribute to the induction of deep traps which result in reduction of space charge accumulation in the nanodielectric.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"11 1","pages":"281-284"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91148357","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9342009
Céline Corbrion, S. Holé
A 2-$mu$m-thick polypropylene sample has been subjected to 10 kV/mm for 4 weeks. Thanks to surface temperature measurement along with heat pulse measurement, it is possible to detect the position at which the electric field varies inside the sample even without inverse convolution calculation.
{"title":"Interface charge effect measurement in 2-μm-thick polypropylene sample under voltage with thermal method","authors":"Céline Corbrion, S. Holé","doi":"10.1109/ICD46958.2020.9342009","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9342009","url":null,"abstract":"A 2-$mu$m-thick polypropylene sample has been subjected to 10 kV/mm for 4 weeks. Thanks to surface temperature measurement along with heat pulse measurement, it is possible to detect the position at which the electric field varies inside the sample even without inverse convolution calculation.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"8 10 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89673281","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341820
I. Rytöluoto, Eetta Saarimäki, J. Pelto, M. Paajanen, Xiaozhen He, R. Anyszka, Amirhossein Mahtabani, W. Dierkes, P. Seri, H. Naderiallaf, K. Lahti, Minna Niittymäki
This study presents a critical evaluation of the effect of two different sample manufacturing techniques on the morphological and dielectric properties of polypropylene (PP)-based nanocomposites, namely mini-scale injection molding (IM) vs. pilot-scale cast film extrusion. Polarized light microscopy revealed that the IM specimen morphology exhibited a layered “skin-core” type morphology, largely differing from the spherulitic morphology of the corresponding extruded cast films. Higher degree of crystallinity in the IM specimens was evidenced by calorimetric and X-ray diffraction methods. The processing-dependent morphological differences were found to affect the isothermal charging current (ICC) and thermally stimulated depolarization current (TSDC) characteristics due to differences in charge mobility and trapping, thus making direct comparison of IM and cast film specimens non-straightforward. Nevertheless, mini-scale injection molding can be seen as a resource-efficient sample manufacturing method for facilitating early-stage screening of the best-performing material candidates, given that the morphological features are carefully taken into account.
{"title":"Feasibility of Mini-Scale Injection Molding for Resource-Efficient Screening of PP-Based Cable Insulation Nanocomposites","authors":"I. Rytöluoto, Eetta Saarimäki, J. Pelto, M. Paajanen, Xiaozhen He, R. Anyszka, Amirhossein Mahtabani, W. Dierkes, P. Seri, H. Naderiallaf, K. Lahti, Minna Niittymäki","doi":"10.1109/ICD46958.2020.9341820","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341820","url":null,"abstract":"This study presents a critical evaluation of the effect of two different sample manufacturing techniques on the morphological and dielectric properties of polypropylene (PP)-based nanocomposites, namely mini-scale injection molding (IM) vs. pilot-scale cast film extrusion. Polarized light microscopy revealed that the IM specimen morphology exhibited a layered “skin-core” type morphology, largely differing from the spherulitic morphology of the corresponding extruded cast films. Higher degree of crystallinity in the IM specimens was evidenced by calorimetric and X-ray diffraction methods. The processing-dependent morphological differences were found to affect the isothermal charging current (ICC) and thermally stimulated depolarization current (TSDC) characteristics due to differences in charge mobility and trapping, thus making direct comparison of IM and cast film specimens non-straightforward. Nevertheless, mini-scale injection molding can be seen as a resource-efficient sample manufacturing method for facilitating early-stage screening of the best-performing material candidates, given that the morphological features are carefully taken into account.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"13 1","pages":"209-212"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83358180","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341830
M. Meissner, E. Matić, S. Schober, Martin Darmann, M. Mittelbach
To determine the long-term persistence of stabilizing additives in thermally upgraded Kraft paper insulation material under operation conditions, the nitrogen migration from the solid material into the encircling insulation material was monitored as part of a large-scale ageing study. Therefore, thermally upgraded as well as normal Kraft paper, combined with pressboard, copper and sheet metal in representative amounts and ratios, was immersed in different types of insulation liquids (mineral oil, G-t-L oil, synthetic as well as natural ester). A continuous 56-day ageing experiment under oxygen-free conditions at elevated temperatures (130 and 150°C) was conducted, with a continuous sampling interval of 2 weeks. The nitrogen concentration of the embedding insulation liquids stayed constant for every insulation liquid aged with natural Kraft paper material, whereas a clear increase of nitrogen levels could be observed over time as soon as thermally upgraded Kraft paper was immersed into the insulation liquids. For prolonged ageing periods at 150°C the measured nitrogen levels in the insulation liquid could rise by as much as 120 ppm, corresponding to nearly 0.3% of dry insulation paper mass, indicating a significant loss of nitrogen-rich stabilizing agents into the corresponding insulation liquid just within weeks of ageing.
{"title":"Monitored Migration of Additives from Thermally Upgraded Paper into Various Insulation Liquids","authors":"M. Meissner, E. Matić, S. Schober, Martin Darmann, M. Mittelbach","doi":"10.1109/ICD46958.2020.9341830","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341830","url":null,"abstract":"To determine the long-term persistence of stabilizing additives in thermally upgraded Kraft paper insulation material under operation conditions, the nitrogen migration from the solid material into the encircling insulation material was monitored as part of a large-scale ageing study. Therefore, thermally upgraded as well as normal Kraft paper, combined with pressboard, copper and sheet metal in representative amounts and ratios, was immersed in different types of insulation liquids (mineral oil, G-t-L oil, synthetic as well as natural ester). A continuous 56-day ageing experiment under oxygen-free conditions at elevated temperatures (130 and 150°C) was conducted, with a continuous sampling interval of 2 weeks. The nitrogen concentration of the embedding insulation liquids stayed constant for every insulation liquid aged with natural Kraft paper material, whereas a clear increase of nitrogen levels could be observed over time as soon as thermally upgraded Kraft paper was immersed into the insulation liquids. For prolonged ageing periods at 150°C the measured nitrogen levels in the insulation liquid could rise by as much as 120 ppm, corresponding to nearly 0.3% of dry insulation paper mass, indicating a significant loss of nitrogen-rich stabilizing agents into the corresponding insulation liquid just within weeks of ageing.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"144 1","pages":"649-652"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76806181","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341856
D. Fabiani, G. Mazzanti, S. V. Suraci, B. Diban
As a part of the H2020 EU Project called “TeaM Cables” - which has, among its aims, modelling reliability of Nuclear Power Plant (NPP) cables - the goal of this paper is to develop a model for the prediction of the residual reliability of Low Voltage (LV) cables for NPPs subjected to gamma radiation stress. The model estimates the probability that such cables withstand random stress overshoot in-service.
{"title":"Preliminary Development and Application of a Stress-Strength Model for Reliability Estimation of Aged LV Cables for Nuclear Power Plants","authors":"D. Fabiani, G. Mazzanti, S. V. Suraci, B. Diban","doi":"10.1109/ICD46958.2020.9341856","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341856","url":null,"abstract":"As a part of the H2020 EU Project called “TeaM Cables” - which has, among its aims, modelling reliability of Nuclear Power Plant (NPP) cables - the goal of this paper is to develop a model for the prediction of the residual reliability of Low Voltage (LV) cables for NPPs subjected to gamma radiation stress. The model estimates the probability that such cables withstand random stress overshoot in-service.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"122 1","pages":"37-40"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88688594","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341947
Penghui Shang, Jiang Wu, Xiaoquan Zheng
In the space irradiation environment, the energetic electrons can penetrate the shielding of the spacecraft and deposit in the dielectric, resulting in internal charging. The deposit charge is difficult to release due to the very low conductivity. When the electric field established by the deposit charge exceeds the threshold of the dielectric, the electrostatic discharges will occur. It is one of the important factors threatening the safe operation of spacecraft. Polyetherimide (PEI) is a high-performance thermoplastic, it maintains desirable electrical and mechanical properties up to 300°C and above. Due to the good processing behavior, it is considered to be used to manufacture the complex components of spacecraft. However, there is rare literature on the internal charging of polyetherimide. This is the primary purpose of this paper. In this paper, A threedimensional charge transport equation for internal charging in dielectric is established. Geant4 is used to calculate the charge deposition rate and energy deposition rate during the interaction of electrons and PEI. The electric field distribution in PEI under different initial energies, different beam densities and different grounding modes is calculated. Research shows that the maximum internal electric field of PEI irradiated by electrons depends on the beam current density, initial energy and the grounding types, which needs to be analyzed based on the operating environment.
{"title":"Research of internal charging characteristics of Polyetherimide irradiated by energetic electrons","authors":"Penghui Shang, Jiang Wu, Xiaoquan Zheng","doi":"10.1109/ICD46958.2020.9341947","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341947","url":null,"abstract":"In the space irradiation environment, the energetic electrons can penetrate the shielding of the spacecraft and deposit in the dielectric, resulting in internal charging. The deposit charge is difficult to release due to the very low conductivity. When the electric field established by the deposit charge exceeds the threshold of the dielectric, the electrostatic discharges will occur. It is one of the important factors threatening the safe operation of spacecraft. Polyetherimide (PEI) is a high-performance thermoplastic, it maintains desirable electrical and mechanical properties up to 300°C and above. Due to the good processing behavior, it is considered to be used to manufacture the complex components of spacecraft. However, there is rare literature on the internal charging of polyetherimide. This is the primary purpose of this paper. In this paper, A threedimensional charge transport equation for internal charging in dielectric is established. Geant4 is used to calculate the charge deposition rate and energy deposition rate during the interaction of electrons and PEI. The electric field distribution in PEI under different initial energies, different beam densities and different grounding modes is calculated. Research shows that the maximum internal electric field of PEI irradiated by electrons depends on the beam current density, initial energy and the grounding types, which needs to be analyzed based on the operating environment.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"116 1","pages":"401-404"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87667275","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341920
D. Fabiani, A. Zucchelli, T. Brugo, G. Selleri, F. Grolli, M. Speranza
This paper deals with the realization of core-shell piezoelectric nanofibers for the production of a multifunctional composite material. The nanofibers are integrated in a hosting material, such as epoxy resin or PDMS (silicon rubber). The aim of this work is to realize a material that is able to recognize a mechanical impact thanks to the specific disposition of the piezoelectric nanofibers.
{"title":"Core-shell piezoelectric nanofibers for multifunctional composite materials","authors":"D. Fabiani, A. Zucchelli, T. Brugo, G. Selleri, F. Grolli, M. Speranza","doi":"10.1109/ICD46958.2020.9341920","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341920","url":null,"abstract":"This paper deals with the realization of core-shell piezoelectric nanofibers for the production of a multifunctional composite material. The nanofibers are integrated in a hosting material, such as epoxy resin or PDMS (silicon rubber). The aim of this work is to realize a material that is able to recognize a mechanical impact thanks to the specific disposition of the piezoelectric nanofibers.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"51 1","pages":"325-328"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90230244","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341821
Diego Machetti, E. Moal, J. Seifert, R. Puffer
Insulating materials that can fill the internal space of hollow-core composite insulators (HCIs) are gaining relevance due to the new areas of applications of these insulators. Such materials must be light and have sufficient electrical properties to preserve the integrity of the inner room of the HCIs. The electrical properties of a light polymeric foam, known as dry syntactic foam (DSF), which is based on two types of hollow microspheres (HMSs), were investigated. Special emphasis is placed on the influence of the density of the resulting material regarding the electrical properties. The results show that the dissipation factor and the relative permittivity have a proportional relationship with the density. Furthermore, two main properties, namely the number of interfaces and the pore size are found to influence the breakdown strength of the DSF.
{"title":"Electrical characterization of low-density solid insulating fillers for hollow-core composite insulators","authors":"Diego Machetti, E. Moal, J. Seifert, R. Puffer","doi":"10.1109/ICD46958.2020.9341821","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341821","url":null,"abstract":"Insulating materials that can fill the internal space of hollow-core composite insulators (HCIs) are gaining relevance due to the new areas of applications of these insulators. Such materials must be light and have sufficient electrical properties to preserve the integrity of the inner room of the HCIs. The electrical properties of a light polymeric foam, known as dry syntactic foam (DSF), which is based on two types of hollow microspheres (HMSs), were investigated. Special emphasis is placed on the influence of the density of the resulting material regarding the electrical properties. The results show that the dissipation factor and the relative permittivity have a proportional relationship with the density. Furthermore, two main properties, namely the number of interfaces and the pore size are found to influence the breakdown strength of the DSF.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"42 1","pages":"673-676"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90262414","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341834
Hajime Shimakawa, A. Kumada, K. Hidaka, T. Yasuoka, Y. Hoshina, M. Shiiki
Surface charges on an insulating epoxy spacer in DC-GIS under high DC electric field lead to decrease breakdown voltage on the spacer, but charge accumulation phenomena of insulators are not clear in detail. In this paper, surface charge distributions on the epoxy model spacer were measured under DC-GIS simulated environment during the DC voltage application for 10,000 hours and the short circuit for 2400 hours. The saturation tendency of charge accumulation in which only the homo-charges develop concentrically near the electrodes was obtained. The time constant of charge accumulation below 20? agreed with the theoretical value calculated from the equivalent circuit. Surface charge characteristics with irregular charge, the ones during charge decumulation, and the relationship between charging saturation tendency and temperature were also obtained.
{"title":"Charge Accumulation/Decumulation on DC-GIS Spacer under 10,000-hour DC Field Application","authors":"Hajime Shimakawa, A. Kumada, K. Hidaka, T. Yasuoka, Y. Hoshina, M. Shiiki","doi":"10.1109/ICD46958.2020.9341834","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341834","url":null,"abstract":"Surface charges on an insulating epoxy spacer in DC-GIS under high DC electric field lead to decrease breakdown voltage on the spacer, but charge accumulation phenomena of insulators are not clear in detail. In this paper, surface charge distributions on the epoxy model spacer were measured under DC-GIS simulated environment during the DC voltage application for 10,000 hours and the short circuit for 2400 hours. The saturation tendency of charge accumulation in which only the homo-charges develop concentrically near the electrodes was obtained. The time constant of charge accumulation below 20? agreed with the theoretical value calculated from the equivalent circuit. Surface charge characteristics with irregular charge, the ones during charge decumulation, and the relationship between charging saturation tendency and temperature were also obtained.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"81 1","pages":"455-458"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90490901","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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