Pub Date : 2011-10-01DOI: 10.1109/CEIDP.2011.6232658
G. Iyer, R. Gorur, A. Krivda, V. H. Camara
Epoxy composites with micro, nano and micro + nano silica fillers have been evaluated for their resistance to corona using point plane electrodes. The experiments were conducted for 500 hours and the surface erosion was measured after every 100 hours using a surface profilometer. The results show significant improvement in corona resistance of micro+nanofilled samples and nanofilled samples when compared with the microfilled samples and unfilled materials respectively. The results emphasize the importance of good filler dispersion.
{"title":"Corona resistance of epoxy nanocomposites","authors":"G. Iyer, R. Gorur, A. Krivda, V. H. Camara","doi":"10.1109/CEIDP.2011.6232658","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232658","url":null,"abstract":"Epoxy composites with micro, nano and micro + nano silica fillers have been evaluated for their resistance to corona using point plane electrodes. The experiments were conducted for 500 hours and the surface erosion was measured after every 100 hours using a surface profilometer. The results show significant improvement in corona resistance of micro+nanofilled samples and nanofilled samples when compared with the microfilled samples and unfilled materials respectively. The results emphasize the importance of good filler dispersion.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78269588","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.2011.6232617
N. Hayashi, H. Suzuki, H. Miyake, Y. Tanaka, T. Maeno
For an insulation layer of a DC power transmission cable, space charge properties of various insulating materials have been investigated using pulsed electro acoustic (PEA) method. Especially, cross-linked polyethylene (XLPE), which has an improved heating resistance by forming a bridge between molecular chains of low density polyethylene (LDPE), is expected to be applied to the insulating layer of the cable. So, the insulating performance of XLPE under high DC stress is important. In the bulk of XLPE layer for power cables, there remain some chemical residues of crosslinking by-product such as acetophenone, α-methylstyrene, and cumylalcohol. Such residues are thought to affect the breakdown strength and space charge behavior in the insulating layer under dc high electric field. Therefore, we have examined the effect of each remaining chemical by-product in LDPE under dc high electric field. In this report, to investigate the effect of cumylalcohol, one of cross-linking by-product, on space charge formation and electric breakdown characteristics in XLPE, we tried to observe the space charge accumulation in XLPE with cumylalcohol under very high dc stress. As the results, it is found a curious and quite interesting space charge formation. In the material, an apparent backward flow of a negative packet-like charge against the electric field is observed. The performance of the packet-like charge is like a “Pororoca” in Amazon River. Furthermore, the relatively low dc breakdown strength was observed in the material. It seems to be a certain relationship between the “Pororoca” and the lower breakdown strength. In this report, the curious phenomena is mainly introduced.
{"title":"Effect of cumylalcohol in XLPE on space charge formation and electric breakdown under DC high electric field","authors":"N. Hayashi, H. Suzuki, H. Miyake, Y. Tanaka, T. Maeno","doi":"10.1109/CEIDP.2011.6232617","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232617","url":null,"abstract":"For an insulation layer of a DC power transmission cable, space charge properties of various insulating materials have been investigated using pulsed electro acoustic (PEA) method. Especially, cross-linked polyethylene (XLPE), which has an improved heating resistance by forming a bridge between molecular chains of low density polyethylene (LDPE), is expected to be applied to the insulating layer of the cable. So, the insulating performance of XLPE under high DC stress is important. In the bulk of XLPE layer for power cables, there remain some chemical residues of crosslinking by-product such as acetophenone, α-methylstyrene, and cumylalcohol. Such residues are thought to affect the breakdown strength and space charge behavior in the insulating layer under dc high electric field. Therefore, we have examined the effect of each remaining chemical by-product in LDPE under dc high electric field. In this report, to investigate the effect of cumylalcohol, one of cross-linking by-product, on space charge formation and electric breakdown characteristics in XLPE, we tried to observe the space charge accumulation in XLPE with cumylalcohol under very high dc stress. As the results, it is found a curious and quite interesting space charge formation. In the material, an apparent backward flow of a negative packet-like charge against the electric field is observed. The performance of the packet-like charge is like a “Pororoca” in Amazon River. Furthermore, the relatively low dc breakdown strength was observed in the material. It seems to be a certain relationship between the “Pororoca” and the lower breakdown strength. In this report, the curious phenomena is mainly introduced.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75789301","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.2011.6232602
B. Petitgas, G. Seytre, O. Gain, G. Boiteux, I. Royaud, A. Serghei, A. Gimenez, A. Anton
This work presents the physico-chemical behavior of several enameled copper wires systems such as PolyEsterImide (PEI)/PolyAmideImide (PAI) or PAI based multi layers compared to PolyImide (PI) which remains the basic enamel material for high temperature applications. The structural, thermal and electrical properties of these systems have been investigated before and after aging in the 200°C-400°C temperature range by thermogravimetric analysis (TGA), ATR-FTIR microscopy, thermomechanical analysis (TMA) and dielectric relaxation spectroscopy (DRS). It has been particularly interesting to carry out physico-chemical analysis directly on enameled wires to improve the understanding of their thermal and electrical behaviour. Dielectric spectroscopy has indicated a loss of insulating properties during the thermal cycle especially for PEI-containing enamels whereas the properties of PI and PAI have been maintained. TGA and IR analyses have not only allowed confirming the PI and PAI high thermal performances, but have also given information on the thermal and chemical stability of PEI/PAI. Such investigations could be helpful for improving the enameled wire high temperature performances.
{"title":"High temperature aging of enameled copper wire — Relationships between chemical structure and electrical behavior","authors":"B. Petitgas, G. Seytre, O. Gain, G. Boiteux, I. Royaud, A. Serghei, A. Gimenez, A. Anton","doi":"10.1109/CEIDP.2011.6232602","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232602","url":null,"abstract":"This work presents the physico-chemical behavior of several enameled copper wires systems such as PolyEsterImide (PEI)/PolyAmideImide (PAI) or PAI based multi layers compared to PolyImide (PI) which remains the basic enamel material for high temperature applications. The structural, thermal and electrical properties of these systems have been investigated before and after aging in the 200°C-400°C temperature range by thermogravimetric analysis (TGA), ATR-FTIR microscopy, thermomechanical analysis (TMA) and dielectric relaxation spectroscopy (DRS). It has been particularly interesting to carry out physico-chemical analysis directly on enameled wires to improve the understanding of their thermal and electrical behaviour. Dielectric spectroscopy has indicated a loss of insulating properties during the thermal cycle especially for PEI-containing enamels whereas the properties of PI and PAI have been maintained. TGA and IR analyses have not only allowed confirming the PI and PAI high thermal performances, but have also given information on the thermal and chemical stability of PEI/PAI. Such investigations could be helpful for improving the enameled wire high temperature performances.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72915246","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.2011.6232612
K. Yagai, H. Miyake, Y. Tanaka, T. Takada
The purpose of our research work is to evaluate some electrical properties of electron beam irradiated insulating materials for spacecraft. The spacecraft like a communication or a broadcasting satellite flying in GEO (Geostationary Orbit) is always exposed to plasma and/or radioactive-rays such as α-, β-, and γ-rays. When the insulating materials, in which the spacecraft is wrapped to keep temperature in it stable, are irradiated by the high energy electron beam, sometimes an unexpected accident due to an electrostatic discharge occurs. The accident sometimes causes a serious mission error of spacecraft. However, it has not known how the irradiation affects to the electrical properties of the materials. In our previous research work, we especially focused on an internal charging phenomenon which must affect to the electrical properties of irradiated polymers for spacecraft such as Polyimide (PI) and Polytetrafluoroethylene (PTFE). Judging from the measurement results, it is found that an amount of negative charge accumulation in PTFE is much larger than that in PI. It seems that the charge accumulation in polymers including fluorine by irradiation of electron beam is larger than that in other polymeric materials. Furthermore, the accumulated charge in the polymer including fluorine remains for long time after irradiation. Such results indicate that the electrical properties are changed by the irradiation. Therefore, we tried to compare the charge accumulation properties between the irradiated and non-irradiated polymeric materials including fluorine. By applying dc stress to them, space charge accumulation processes in various irradiated materials are observed. From the results, it is found that the charge accumulation processes in irradiated materials are completely different from the non-irradiated materials.
{"title":"Internal charging phenomena and change of electrical properties in electron beam irradiated insulating materials for spacecraft","authors":"K. Yagai, H. Miyake, Y. Tanaka, T. Takada","doi":"10.1109/CEIDP.2011.6232612","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232612","url":null,"abstract":"The purpose of our research work is to evaluate some electrical properties of electron beam irradiated insulating materials for spacecraft. The spacecraft like a communication or a broadcasting satellite flying in GEO (Geostationary Orbit) is always exposed to plasma and/or radioactive-rays such as α-, β-, and γ-rays. When the insulating materials, in which the spacecraft is wrapped to keep temperature in it stable, are irradiated by the high energy electron beam, sometimes an unexpected accident due to an electrostatic discharge occurs. The accident sometimes causes a serious mission error of spacecraft. However, it has not known how the irradiation affects to the electrical properties of the materials. In our previous research work, we especially focused on an internal charging phenomenon which must affect to the electrical properties of irradiated polymers for spacecraft such as Polyimide (PI) and Polytetrafluoroethylene (PTFE). Judging from the measurement results, it is found that an amount of negative charge accumulation in PTFE is much larger than that in PI. It seems that the charge accumulation in polymers including fluorine by irradiation of electron beam is larger than that in other polymeric materials. Furthermore, the accumulated charge in the polymer including fluorine remains for long time after irradiation. Such results indicate that the electrical properties are changed by the irradiation. Therefore, we tried to compare the charge accumulation properties between the irradiated and non-irradiated polymeric materials including fluorine. By applying dc stress to them, space charge accumulation processes in various irradiated materials are observed. From the results, it is found that the charge accumulation processes in irradiated materials are completely different from the non-irradiated materials.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73223252","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.2011.6232648
J. Aakervik, G. Berg, S. Hvidsten
High voltage apparatus and reliable power supply are of vital importance for subsea processing. The purpose of this work has been to develop a small high voltage penetrator for use with high pressure vessels in the laboratory. Such equipment can facilitate high voltage and current testing of models and materials at relevant subsea conditions. It is shown that the penetrator can withstand a hydrostatic differential pressure of 500 bars and 90°C for more than 6 months. The breakdown voltage of the penetrator is only limited by the model cable used in the design, making it attractive to use high voltage class cables. Sensitive partial discharge measurements of pressurized test objects can be implemented by using adapted oil-filled terminations.
{"title":"Design of a high voltage penetrator for high pressure and temperature laboratory testing","authors":"J. Aakervik, G. Berg, S. Hvidsten","doi":"10.1109/CEIDP.2011.6232648","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232648","url":null,"abstract":"High voltage apparatus and reliable power supply are of vital importance for subsea processing. The purpose of this work has been to develop a small high voltage penetrator for use with high pressure vessels in the laboratory. Such equipment can facilitate high voltage and current testing of models and materials at relevant subsea conditions. It is shown that the penetrator can withstand a hydrostatic differential pressure of 500 bars and 90°C for more than 6 months. The breakdown voltage of the penetrator is only limited by the model cable used in the design, making it attractive to use high voltage class cables. Sensitive partial discharge measurements of pressurized test objects can be implemented by using adapted oil-filled terminations.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74333836","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}
Systematic researched have been made of the grain growth and density of sintered ZnO-based systems containing one or more additive oxides of the type Bi2O3, MnO2, and CoO. These samples were characterized using such techniques as scanning electron microscopy. The influence of the nature and amount of additive oxides and sintering temperature at 950 to 1350°C is discussed in relation to microstructure, breakdown voltage and the density present.
{"title":"Researched on microstructure and density of sintered ZnO non-linear resistors","authors":"Chuntian Chen, Haifeng Xiao, J. Zou, Ru Wang, Hanfei Zhu, Xianyou Zhang","doi":"10.1109/CEIDP.2011.6232624","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232624","url":null,"abstract":"Systematic researched have been made of the grain growth and density of sintered ZnO-based systems containing one or more additive oxides of the type Bi2O3, MnO2, and CoO. These samples were characterized using such techniques as scanning electron microscopy. The influence of the nature and amount of additive oxides and sintering temperature at 950 to 1350°C is discussed in relation to microstructure, breakdown voltage and the density present.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74855225","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.2011.6232619
Y. Gao, B. Du, J. Cui, K. Wu
Polymer insulating materials installed in electronic and electrical devices have been used in space equipment and nuclear power station where the materials are exposed to high energetic radioactive rays. The molecular structure can be changed by radiation induced chemical reactions that possibly lead to the variation of characteristics of surface charge dynamics, which in turn influences the safe use of the devices. From the viewpoint of safety, it is essential to have a firm understanding of radiation effect on the surface charge behavior. This paper presents study aimed at clarifying gamma-ray irradiation effect on lateral charge decay on surface of epoxy resin. The samples were irradiated in air up to 100 kGy and then up to 1000 kGy with dosage rate of 10 kGy/h by using a 60Co gamma-source in advance of the test. Surface charge was introduced by corona charging and the decay behavior was examined with an electrostatic voltmeter. Isothermal surface potential decay was also performed to verify the lateral charge motion. Obtained results show that the lateral motion of charge is encouraged by the irradiation. It is suggested that the lateral charge decay is dependent upon the characteristics of localized surface states that are altered by the degradation reaction occurred within surface layer of ER.
{"title":"Effect of gamma-ray irradiation on lateral charge motion on surface of laminated polymer insulating materials","authors":"Y. Gao, B. Du, J. Cui, K. Wu","doi":"10.1109/CEIDP.2011.6232619","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232619","url":null,"abstract":"Polymer insulating materials installed in electronic and electrical devices have been used in space equipment and nuclear power station where the materials are exposed to high energetic radioactive rays. The molecular structure can be changed by radiation induced chemical reactions that possibly lead to the variation of characteristics of surface charge dynamics, which in turn influences the safe use of the devices. From the viewpoint of safety, it is essential to have a firm understanding of radiation effect on the surface charge behavior. This paper presents study aimed at clarifying gamma-ray irradiation effect on lateral charge decay on surface of epoxy resin. The samples were irradiated in air up to 100 kGy and then up to 1000 kGy with dosage rate of 10 kGy/h by using a 60Co gamma-source in advance of the test. Surface charge was introduced by corona charging and the decay behavior was examined with an electrostatic voltmeter. Isothermal surface potential decay was also performed to verify the lateral charge motion. Obtained results show that the lateral motion of charge is encouraged by the irradiation. It is suggested that the lateral charge decay is dependent upon the characteristics of localized surface states that are altered by the degradation reaction occurred within surface layer of ER.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79345692","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.2011.6232622
R. Sundararajan, Ramya Rajendran, Sajan S. Shahid, D. Santosh, S. Radhakrishnan, K. Priyadarshan, S. Varsha, U. Kumar, R. Ramachandran, K. Sankaranarayanan
Cancer remains responsible for several million deaths each year, occurring worldwide. The conventional treatment strategies for cancer cause a plethora of side effects along with an exorbitant treatment cost per sitting. The focus now is on the development of new modalities of treatments which could minimize the side effects and prove to be an affordable treatment option to the patients. Usage of electrical pulses along with drugs - Electrochemotherapy (ECT) is a fast rising option for the treatment of chemo-refractive cancers. This has proven to be more efficient and effective than other existing methods of treatment and there is a growing evidence of research and clinical trials on the same. The major advantage that this mode of treatment offers is the massive reduction in the dosage of drug that is administered, thus significantly reducing the intensity of undesired side effects. The applied electrical pulses can be of two types - that for reversible and irreversible electroporation of cells. While reversible electroporation is primarily used as a means for delivery of molecules into the cell, irreversible electroporation is a mode which could be applied as such in the absence of a chemodrug to kill the cancerous cells. This would be of immense significance in the clinical scenario since it could be targeted treatment while totally eliminating the necessity of any chemodrug. In this paper we give a detailed report on the effect of such high voltage pulses on cancer cells. The variables tested out in the pulse parameters used include intensity of electric field applied, pulse duration, number of pulses and time interval between each train. The electric field applied is varied between 500V/cm to 2500V/cm with a pulse duration ranging from microseconds to milliseconds to keep the energy delivery constant. The effect of the parameters individually and effect of combination of all these parameters on the cells is studied and discussed in this paper. This study could be of clinical relevance in the translation of these findings to application at the patient-level.
{"title":"Effect of irreversible electroporation on cancer cells","authors":"R. Sundararajan, Ramya Rajendran, Sajan S. Shahid, D. Santosh, S. Radhakrishnan, K. Priyadarshan, S. Varsha, U. Kumar, R. Ramachandran, K. Sankaranarayanan","doi":"10.1109/CEIDP.2011.6232622","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232622","url":null,"abstract":"Cancer remains responsible for several million deaths each year, occurring worldwide. The conventional treatment strategies for cancer cause a plethora of side effects along with an exorbitant treatment cost per sitting. The focus now is on the development of new modalities of treatments which could minimize the side effects and prove to be an affordable treatment option to the patients. Usage of electrical pulses along with drugs - Electrochemotherapy (ECT) is a fast rising option for the treatment of chemo-refractive cancers. This has proven to be more efficient and effective than other existing methods of treatment and there is a growing evidence of research and clinical trials on the same. The major advantage that this mode of treatment offers is the massive reduction in the dosage of drug that is administered, thus significantly reducing the intensity of undesired side effects. The applied electrical pulses can be of two types - that for reversible and irreversible electroporation of cells. While reversible electroporation is primarily used as a means for delivery of molecules into the cell, irreversible electroporation is a mode which could be applied as such in the absence of a chemodrug to kill the cancerous cells. This would be of immense significance in the clinical scenario since it could be targeted treatment while totally eliminating the necessity of any chemodrug. In this paper we give a detailed report on the effect of such high voltage pulses on cancer cells. The variables tested out in the pulse parameters used include intensity of electric field applied, pulse duration, number of pulses and time interval between each train. The electric field applied is varied between 500V/cm to 2500V/cm with a pulse duration ranging from microseconds to milliseconds to keep the energy delivery constant. The effect of the parameters individually and effect of combination of all these parameters on the cells is studied and discussed in this paper. This study could be of clinical relevance in the translation of these findings to application at the patient-level.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82153068","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.2011.6232756
C. V. Bouanga, S. Savoie, H. Couderc, M. Frechette, É. David
The aim of this study is to measure the complex dielectric constant over a wide range of frequencies for ceramic powders often used as additives in polymer composites. The dielectric responses of alumina and boron nitride powders are presented. The variation of the dielectric constant in the studied frequency range (10-1 Hz to 10 kHz) showed that there is absorption of the water on the surface of the powder. Therefore, different treatments were applied: heating at 100°C for 48 hours and under vacuum at room temperature. A significant change on the value of the permittivity at low frequency has been observed after treatment. By comparing the results obtained before and after treatment, the dielectric response of the powder measured under vacuum showed stability over the studied frequency range at room temperature. The measured values of the permittivity of the powder were used to estimate those of the bulk material using a mixing law. This situation is discussed.
{"title":"The dielectric permittivity of ceramic powders used in composite polymers","authors":"C. V. Bouanga, S. Savoie, H. Couderc, M. Frechette, É. David","doi":"10.1109/CEIDP.2011.6232756","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232756","url":null,"abstract":"The aim of this study is to measure the complex dielectric constant over a wide range of frequencies for ceramic powders often used as additives in polymer composites. The dielectric responses of alumina and boron nitride powders are presented. The variation of the dielectric constant in the studied frequency range (10-1 Hz to 10 kHz) showed that there is absorption of the water on the surface of the powder. Therefore, different treatments were applied: heating at 100°C for 48 hours and under vacuum at room temperature. A significant change on the value of the permittivity at low frequency has been observed after treatment. By comparing the results obtained before and after treatment, the dielectric response of the powder measured under vacuum showed stability over the studied frequency range at room temperature. The measured values of the permittivity of the powder were used to estimate those of the bulk material using a mixing law. This situation is discussed.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84359353","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.2011.6232635
D. Chowdary, J. Amarnath
In Gas Insulated Systems the breakdown strength of SF6 gas is badly affected by locally enhanced electric fields due to protrusions and delamination. Metal insert electrodes, which are used in GIS, reduces stresses near the triple junctions with simultaneous rise in the stresses elsewhere along spacer surface. AC-GIS are in operation for a long time but there is a limited knowledge for DC application. In the case of DC-GIS, charges invariably accumulate over a period of time along the spacer surface. The electric field distribution around solid spacer is greatly altered by the accumulated surface charges. In this work, the electric field distribution with DC as applied voltage is studied at the triple junction for a cone type spacer with and without metal insert along with the effect of delamination and protrusions on the surface of the insulator. Finite Element Method (FEM), one of the proven numerical method, is used for computing the electric fields at various points under consideration.
{"title":"Electric field analysis at the triple junction of a optimum profile disc type spacer in SF6 gas insulated system with abnormalities under DC voltages","authors":"D. Chowdary, J. Amarnath","doi":"10.1109/CEIDP.2011.6232635","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232635","url":null,"abstract":"In Gas Insulated Systems the breakdown strength of SF6 gas is badly affected by locally enhanced electric fields due to protrusions and delamination. Metal insert electrodes, which are used in GIS, reduces stresses near the triple junctions with simultaneous rise in the stresses elsewhere along spacer surface. AC-GIS are in operation for a long time but there is a limited knowledge for DC application. In the case of DC-GIS, charges invariably accumulate over a period of time along the spacer surface. The electric field distribution around solid spacer is greatly altered by the accumulated surface charges. In this work, the electric field distribution with DC as applied voltage is studied at the triple junction for a cone type spacer with and without metal insert along with the effect of delamination and protrusions on the surface of the insulator. Finite Element Method (FEM), one of the proven numerical method, is used for computing the electric fields at various points under consideration.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90778996","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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