Pub Date : 2020-07-05DOI: 10.1109/ICD46958.2020.9341963
F. Seifert, I. Porizka, C. Leu
A big challenge for future electric grids is the energetic coupling of DC systems. This can be realized by Solid-State-Transformers with an operating medium frequency AC voltage generated by power electronic converters. The DC voltage and the superimposed medium frequency AC voltage stress the insulation system because of, for instance, partial discharges. In this paper, the results of the measurement of the charge accumulation by corona discharges at this composite voltage at a polyethylene surface are presented.
{"title":"Charge Accumulation at High DC Voltage and Superimposed Medium Frequency AC Voltage","authors":"F. Seifert, I. Porizka, C. Leu","doi":"10.1109/ICD46958.2020.9341963","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341963","url":null,"abstract":"A big challenge for future electric grids is the energetic coupling of DC systems. This can be realized by Solid-State-Transformers with an operating medium frequency AC voltage generated by power electronic converters. The DC voltage and the superimposed medium frequency AC voltage stress the insulation system because of, for instance, partial discharges. In this paper, the results of the measurement of the charge accumulation by corona discharges at this composite voltage at a polyethylene surface are presented.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"112 1","pages":"333-337"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73999703","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/ICD46958.2020.9341838
S. Sarov Mohan, P. Preetha
Transformers are critical components of electric power transmission and distribution system. Mineral oil (MO) based multi-particle nanofluid (MPNF) were prepared with an intention to enhance electrical properties of MO by incorporating $A1_{2}O_{3}$ and TiO2 nanoparticles. Filler loading concentration and mixing ratio, which is the ratio between $A1_{2}O_{3}$ and TiO2 nanoparticle content is optimized by analyzing the simulation results. AC breakdown strength of the prepared samples were measured. It is found that, MPNF sample having a filler loading concentration of 0.1weight percentage (wt%) and mixing ratio of 9:1 shows highest AC breakdown strength. This sample shows an enhancement of 38.4%, 15.86%, and 17.41%, w.r.t pure oil, $A1_{2}O_{3}$ and TiO2 NFs having same filler loading concentration.
{"title":"Optimization of Filler Loading of Multi-Particle Mineral Oil Nanofluid for Transformer Insulation","authors":"S. Sarov Mohan, P. Preetha","doi":"10.1109/ICD46958.2020.9341838","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341838","url":null,"abstract":"Transformers are critical components of electric power transmission and distribution system. Mineral oil (MO) based multi-particle nanofluid (MPNF) were prepared with an intention to enhance electrical properties of MO by incorporating $A1_{2}O_{3}$ and TiO2 nanoparticles. Filler loading concentration and mixing ratio, which is the ratio between $A1_{2}O_{3}$ and TiO2 nanoparticle content is optimized by analyzing the simulation results. AC breakdown strength of the prepared samples were measured. It is found that, MPNF sample having a filler loading concentration of 0.1weight percentage (wt%) and mixing ratio of 9:1 shows highest AC breakdown strength. This sample shows an enhancement of 38.4%, 15.86%, and 17.41%, w.r.t pure oil, $A1_{2}O_{3}$ and TiO2 NFs having same filler loading concentration.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"14 1","pages":"712-715"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74758347","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/ICD46958.2020.9341985
Gu-Young Kwon, Yeong Ho Lee, S. Bang, G. Ji, Geon Seok Lee, Z. A. Tamus, Y. Shin
Instrumentation and control (I&C) cable connected between numerous sensors and main control room contributes to the safe operation of nuclear power plants (NPPs). Some of I&C cables are installed in the place exposed to cable degradation causes such as mechanical damage, heat, and radiation. In this paper, two cable aging assessment parameters extracted from the results of time-frequency domain reflectometry (TFDR) is proposed to maintain the reliable and stable operation of the NPPs. To verify the proposed method, two different EPR insulated cables from distinct manufactures are adopted to accelerated thermal aging test. After aging, the assessment parameters of each cable are calculated, and the trend and linearity of the assessment parameters are observed. It is expected that the proposed method allows to ensure the safe operation of nuclear power plant.
{"title":"Assessment of Cable Aging for Nuclear Power Plants I&C Cable via Time-Frequency Domain Reflectometry","authors":"Gu-Young Kwon, Yeong Ho Lee, S. Bang, G. Ji, Geon Seok Lee, Z. A. Tamus, Y. Shin","doi":"10.1109/ICD46958.2020.9341985","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341985","url":null,"abstract":"Instrumentation and control (I&C) cable connected between numerous sensors and main control room contributes to the safe operation of nuclear power plants (NPPs). Some of I&C cables are installed in the place exposed to cable degradation causes such as mechanical damage, heat, and radiation. In this paper, two cable aging assessment parameters extracted from the results of time-frequency domain reflectometry (TFDR) is proposed to maintain the reliable and stable operation of the NPPs. To verify the proposed method, two different EPR insulated cables from distinct manufactures are adopted to accelerated thermal aging test. After aging, the assessment parameters of each cable are calculated, and the trend and linearity of the assessment parameters are observed. It is expected that the proposed method allows to ensure the safe operation of nuclear power plant.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"18 1","pages":"77-80"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77697346","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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