{"title":"Breakdown strength and electrical conductivity of epoxy-cubic boron nitride composites","authors":"I. Tsekmes, R. Kochetov, P. Morshuis, J. Smit","doi":"10.1109/CEIDP.2015.7352015","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352015","url":null,"abstract":"In this paper, the results of AC and DC breakdown tests on epoxy - cubic boron nitride composites are presented. The main goals are to investigate the influence of fill grade on the breakdown strength of composites and evaluate the influence of water uptake on their electrical performance. The results suggest that the performance of these composites exhibit a similar trend to other epoxy composites. Thus, a higher breakdown strength can be achieved at low filler concentrations. Furthermore, it seems that the uptake of water greatly affects the breakdown strength of composites, especially under DC stresses.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134488686","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}
{"title":"Investigation on static electrification phenomenon of ester liquids and mineral oil","authors":"A. Beroual, F. Sadaoui, M. Coulibaly, C. Perrier","doi":"10.1109/CEIDP.2015.7352034","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352034","url":null,"abstract":"This paper aims at the comparison of the Electrostatic Charging Tendency (ECT) of mineral, vegetable and synthetic oils using a spinning disk system (CIGRE Cell) covered on its both sides with different types of pressboards and papers. The ECT of insulating oils generated by the charge concentration gradient at the oil - pressboard/paper interfaces are analyzed in function of the rotating speed of the disk. It is shown that the generated charge is slightly higher with vegetable oil than that with mineral and synthetic ester oils. This may be due to differences in the molecular structures of these oils, whose interaction with the pressboard/paper is different; the phenomena occurring at the double-layer (interface) are not identical. However, the differences observed do not constitute an obstacle to the use of vegetable oil as a substitute for mineral or synthetic oils, with respect to the problems and risks associated with static electrification phenomena.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131663930","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}
L. Chen, P. Widger, M. S. Kamarudin, H. Griffiths, A. Haddad
{"title":"Potential of CF3I gas mixture as an insulation medium in gas-insulated equipment","authors":"L. Chen, P. Widger, M. S. Kamarudin, H. Griffiths, A. Haddad","doi":"10.1109/CEIDP.2015.7352013","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352013","url":null,"abstract":"SF6 is a widely used gas medium in gas-insulated equipment. Due to the high global warming potential and long atmospheric lifetime of SF6, there has been research into a new environmentally friendly replacement gas. This paper describes the research carried out at Cardiff University on CF3I gas and its mixture as a substitute insulation medium for SF6 in gas-insulated lines (GIL). A reduced-scale coaxial test system having the electric field properties of a full-scale 400 kV GIL system was fabricated. The design of the reduced-scale coaxial test system was simulated to ensure that the highest electric field would be along the center of the conductor. The coaxial prototype was then tested under a standard lightning impulse (1.2/50) in order to determine the 50% breakdown voltage for such a system when insulated with CF3I gas mixture. It was found that CF3I has the potential to replace SF6 as an insulation medium in GIL. A full-scale short length GIL demonstrator is being assembled in the laboratory to evaluate further the feasibility of using a CF3I gas mixture as an insulation medium.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115237913","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}
{"title":"Experimental study on spatial emission spectrum characteristics in a dielectric barrier discharge component for Ar atmospheric pressure plasma jet formation","authors":"T. Goto, N. S. Midi, R. Ohyama","doi":"10.1109/CEIDP.2015.7352061","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352061","url":null,"abstract":"Atmospheric pressure plasma is type of plasma that doesn't need low-pressure apparatus system. Compared to other procedure in generating atmospheric pressure plasma jet, the application of the dielectric barrier discharge (DBD) is comparatively simple. However, the details regarding the electric discharge properties and active species' forming reaction is still unclear. It is also important to understand the plasma generation region, which is the key component of DBD for the application in future works. Therefore in this work, the generation region of Ar plasma caused by dielectric barrier discharge was investigated. The atmospheric pressure plasma generating device used in this experiment was constructed by covering a part of a copper pipe, which act as an electric discharge electrode with a silica glass pipe. As a grounding electrode, the exterior part of the silica glass pipe was wrapped with a copper foil. This plasma was examined using emission spectroscopy method from the side of the silica glass pipe. The copper foil was provided with a slit for measuring the emission spectroscopy in the grounding electrode area. The measurement was ranged from the edge of copper pipe until the end of plasma emission. From the results, spatial emission spectrum of excited Ar had shown different emission intensity according to the point location. This paper discusses about the spatial emission characteristics by focusing on the dielectric barrier.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124394811","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}
M. Kurimoto, Y. Yamashita, H. Ozaki, T. Kato, T. Funabashi, Y. Suzuoki
{"title":"3D printing of conical insulating spacer using alumina /UV-cured-resin composite","authors":"M. Kurimoto, Y. Yamashita, H. Ozaki, T. Kato, T. Funabashi, Y. Suzuoki","doi":"10.1109/CEIDP.2015.7352047","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352047","url":null,"abstract":"3D printing is a process of joining materials, usually layer upon layer, to make objects from 3D model data. It has a potential to provide various prototypes of solid insulator and the insulators with gradient material e.g. functionally graded material. This paper investigates the feasibility of 3D printing of a conical insulating spacer with using alumina/UV-cured-resin composite material. The light transmission characteristics of the composite material revealed that UV was transmitted through the composite system although the amount of micrometric alumina fillers was 40 vol%. It provides the evidence that the alumina composite is cured by UV. The permittivity characteristics of the composites was confirmed to be according to the formulas for permittivity of two media. Furthermore, 3D model data of the conical insulating spacer was designed by FEM software and printed out by the stereolithographic 3D printer. Finally, we confirmed the 3D printer could produce a prototype of the conical insulating spacer using the alumina/UV-cured-resin composite.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124670859","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}
{"title":"Ion generation and transport in low density polyethylene under electric stress","authors":"S. Le Roy, G. Teyssèdre","doi":"10.1109/CEIDP.2015.7352092","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352092","url":null,"abstract":"Synthetic materials such as cross-linked polyethylene (XLPE) are increasingly used as electrical insulation in HVDC power cables, compared to oil impregnated insulation. However, because of their dielectric properties, these materials can accumulate charges in the insulation, generated by dissociation of species or injected at the electrodes. This accumulation phenomenon can cause an increase of the electric field which can lead to the dielectric breakdown of the material, meaning thereby stopping the distribution of electricity. It is therefore important to understand these charge accumulation mechanisms for HVDC application, and particularly the role of ions, generated by dissociation of by-products of cross-linking agents, that can transport and take part to space charge accumulation. In this goal, we have considered a simple model material consisting of low-density polyethylene (LDPE) films soaked in cumylalcohol, a by-product often encountered in peroxide-crosslinked XLPE and thought to dissociate under field to provide ionic carriers. The impact of the soaking time, electric field and temperature on space charge density profiles recorded using the Pulsed Electro Acoustic method (PEA) and on charging current are presented and compared to those obtained on un-soaked LDPE samples.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127324264","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}
{"title":"Effect of POSS as compatibilizing agent on structure and dielectric response of LDPE/TiO2 nanocomposites","authors":"B. Zazoum, M. Frechette, É. David","doi":"10.1109/CEIDP.2015.7352110","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352110","url":null,"abstract":"Two types of nanocomposites were prepared. The first type was prepared by ball milling-blending of untreated titanium dioxide (TiO2) nanoparticles into low density polyethylene (LDPE). For the second type, a commercial chemically treated TiO2 with trisilanol phenyl polyhedral oligomeric silsesquioxane (TSP-POSS) as dispersant was ball milling-blended into LDPE. In this paper, titanium dioxide was selected as a model to show the effect of POSS on dispersion improvement of metal oxides nanoparticles and to understand the correlation between structure and dielectric response of LDPE/TiO2 nanocomposites. The microscopic observation by AFM showed that the TiO2 treated with the POSS were better dispersed in the polymer matrix as compared to untreated TiO2. Furthermore, the dielectric loss for the nanocomposites filled with treated TiO2 was significantly lower than that for nanocomposites filled with untreated TiO2 nanoparticles.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"55 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120923022","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}
{"title":"Mapping of fields induced by electrical trees in polyethylene","authors":"Y. Serdyuk, Xiangrong Chen, S. Gubanski","doi":"10.1109/CEIDP.2015.7352016","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352016","url":null,"abstract":"A technique for calculating electric field distributions associated with electric trees in polyethylene is presented. The method utilizes images of trees obtained by means of visible-light microscopy and image-to-material conversion for setting up a computational model. Results of calculations of fields induced by various types of single trees in needle-plane electrode system as well as multiple trees in wire-plane system are discussed. For the former, the computed magnitudes of the field strength are compared with those obtained utilizing other advanced imaging techniques.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121044696","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}
{"title":"Temperature dependence of quasi-ferroelectric hysteresis in a model ferroelectret system","authors":"X. Qiu, M. Steffen, W. Wirges, R. Gerhard","doi":"10.1109/CEIDP.2015.7352098","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352098","url":null,"abstract":"Non-uniform dielectric materials or materials systems with foam structure can be rendered piezoelectric by internal charging of their cavities through a series of dielectric barrier discharges (DBDs). DBDs inside the cavities lead to phenomenological hysteresis curves that can in principle not be distinguished from those on other ferroic materials. Here, the influence of the gas temperature on the hysteresis loops of ferroelectrets has been studied over a wide temperature range from -100 to +140°C. In order to minimize temperature-induced changes in the geometry of the cavities and in the charge-storage behaviour of the dielectric, mica sheets were employed for assembling the ferroelectret systems. The coercive voltage and the effective polarization of the mica ferroelectret samples were determined as functions of the temperature of the sample and its gas-filled cavities. The results are discussed with respect to Paschen's law for electric breakdown - taking into account the respective gas temperature. It is shown that the threshold voltage decreases with increasing temperature. Therefore, the charging or poling temperature is an important parameter that strongly affects the phenomenological coercive field and the remanent polarization of ferroelectrets. The results should be taken into account when optimizing the charging process of ferroelectrets.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124935273","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}
{"title":"Polarization of LLDPE/HNT and HDPE/HNT blends in AC electric field","authors":"P. Kadlec, M. Č̌ermák, P. Prosr, R. Polanský","doi":"10.1109/CEIDP.2015.7352063","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352063","url":null,"abstract":"Halloysite nanotubes (HNT) represent a type of aluminosilicate clay of natural origin with nanotubular structure. HNT have been started to use in many industrial fields, including the application in the electrical engineering. This paper is focused on the determination of dielectric properties of pure halloysite nanotubes, as well as, a polyethylene (LLDPE and HDPE) based HNT nanocomposite (blends). Individual samples in each series had contained different amount of HNT filler. The impact of the HNT content and the impact of the type of polyethylene on the dielectric properties were observed and evaluated. Measurements were carried out under the AC field via a broadband dielectric spectroscopy. Dielectric properties were evaluated through real and imaginary parts of the complex relative permittivity. Results are displayed as surface visualizations of frequency and temperature dependence. The relaxation times of selected relaxation processes were analyzed according to the theory of relaxation polarization.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116562527","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}