Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6748119
Cui Yunguang, Wu Guangning, Wang Xiaojian, Peng Qian, Chen Ling, G. Bo
To research the influence of one of the aging product (organic acid) of cellulose on oil-paper insulation, low molecular weight of the carboxylic acid (formic, acetic) and high molecular weight of the carboxylic acid (stearic) have been added to new electric insulating oil to arrive at a neutralization value of 0.3mgKOH/g, the initial moisture content in insulation paper have been controlled at 0.5% and 2.75%. The distribution characters of organic acid in oil-paper insulation and the influence of organic acid on thermal aging of oil-paper insulation at 70°C, 90°C and 110°C have been investigated. Experimental results show that formic and acetic could be easily absorbed by insulation paper while stearic could easily dissolve in electric insulating oil. There is no significant influence of temperature and initial moisture content on the distribution characters of organic acid in oil-paper insulation. Low molecular acid would work together with moisture to accelerate the aging speed of insulation paper.
{"title":"The Influence of Organic Acid on Thermal Aging of Power Transformer Oil-paper Insulation","authors":"Cui Yunguang, Wu Guangning, Wang Xiaojian, Peng Qian, Chen Ling, G. Bo","doi":"10.1109/CEIDP.2013.6748119","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748119","url":null,"abstract":"To research the influence of one of the aging product (organic acid) of cellulose on oil-paper insulation, low molecular weight of the carboxylic acid (formic, acetic) and high molecular weight of the carboxylic acid (stearic) have been added to new electric insulating oil to arrive at a neutralization value of 0.3mgKOH/g, the initial moisture content in insulation paper have been controlled at 0.5% and 2.75%. The distribution characters of organic acid in oil-paper insulation and the influence of organic acid on thermal aging of oil-paper insulation at 70°C, 90°C and 110°C have been investigated. Experimental results show that formic and acetic could be easily absorbed by insulation paper while stearic could easily dissolve in electric insulating oil. There is no significant influence of temperature and initial moisture content on the distribution characters of organic acid in oil-paper insulation. Low molecular acid would work together with moisture to accelerate the aging speed of insulation paper.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"2007 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125583568","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748226
P. Mancinelli, T. Heid, D. Fabiani, A. Saccani, M. Toselli, M. Frechette, S. Savoie, É. David
Graphene oxide (GO) water solution has been added and mixed to epoxy resin. Water has been evaporated at low pressure and the resulting mixture has been cured through an amine. Heating GO-epoxy samples at 130°C in situ chemical reduction of GO has been carried out. Dielectric constant of these graphene-based samples shows an increase of more than 50% compared to neat epoxy even for 0.3 wt% of GO dispersed into the matrix. This procedure may open a new way on tuning electrical properties of insulating materials.
{"title":"Thermal in situ reduction of graphene oxide in epoxy-based nanodielectrics: Influence on dielectric properties","authors":"P. Mancinelli, T. Heid, D. Fabiani, A. Saccani, M. Toselli, M. Frechette, S. Savoie, É. David","doi":"10.1109/CEIDP.2013.6748226","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748226","url":null,"abstract":"Graphene oxide (GO) water solution has been added and mixed to epoxy resin. Water has been evaporated at low pressure and the resulting mixture has been cured through an amine. Heating GO-epoxy samples at 130°C in situ chemical reduction of GO has been carried out. Dielectric constant of these graphene-based samples shows an increase of more than 50% compared to neat epoxy even for 0.3 wt% of GO dispersed into the matrix. This procedure may open a new way on tuning electrical properties of insulating materials.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126617254","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748293
Mingze Gao, Peihong Zhang, Feifeng Wang, Lin Li, Zhongyuan Li
The effect of nano-fillers on dielectric properties of Epoxy has been studied for years. However, with the same nano-particles component, there are some conflicting reports regarding the effect of nano-particles on the dielectric properties of composites. The different processing will result in different dispersion of nano-particles and different dielectric properties of composites as a result of the agglomerate and distribution of nano-particle. Here we investigate the relationship between dielectric properties and nano-particle dispersions of nano-Silica/Epoxy composites. The dielectric properties including permittivity, corona-resistance, breakdown strength and dispersion are quantitative analyzed by Image J and mathematical method. Some rules are discovered between dielectric properties and nano-particle dispersion.
{"title":"The relationship between dielectric properties and nanoparticle dispersion of nano-SILICA/Epoxy composites","authors":"Mingze Gao, Peihong Zhang, Feifeng Wang, Lin Li, Zhongyuan Li","doi":"10.1109/CEIDP.2013.6748293","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748293","url":null,"abstract":"The effect of nano-fillers on dielectric properties of Epoxy has been studied for years. However, with the same nano-particles component, there are some conflicting reports regarding the effect of nano-particles on the dielectric properties of composites. The different processing will result in different dispersion of nano-particles and different dielectric properties of composites as a result of the agglomerate and distribution of nano-particle. Here we investigate the relationship between dielectric properties and nano-particle dispersions of nano-Silica/Epoxy composites. The dielectric properties including permittivity, corona-resistance, breakdown strength and dispersion are quantitative analyzed by Image J and mathematical method. Some rules are discovered between dielectric properties and nano-particle dispersion.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121530517","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748310
M. Saltzer, B. Kallstrand, K. Johansson, D. Borg, J. Schiessling, C. Doiron
Even under corona-free conditions, insulating structures (materials) may be charged in DC fields. This is due to the fact that air has a finite ionic conductivity. The finite conductivity of air results from charges generated by background radio activity and cosmic radiation. Typical ion concentrations on ground are 107 to 1010 ions/m3 which leads to conductivities ranging from 10-16 to 10-13 S/m. An experiment has been conducted where the end of a terminated high voltage XLPE cable was used as an insulating structure. The field distribution around the stripped cable end was measured with an applied DC voltage of -140 kV using a rotating field probe. The measurements are compared to simulations, which do not specifically take into account space charge effects. A big discrepancy is observed, showing the relevance of taking into account space charge effects when modeling HVDC insulation components subjected to air.
{"title":"DC field measurements around a cable end","authors":"M. Saltzer, B. Kallstrand, K. Johansson, D. Borg, J. Schiessling, C. Doiron","doi":"10.1109/CEIDP.2013.6748310","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748310","url":null,"abstract":"Even under corona-free conditions, insulating structures (materials) may be charged in DC fields. This is due to the fact that air has a finite ionic conductivity. The finite conductivity of air results from charges generated by background radio activity and cosmic radiation. Typical ion concentrations on ground are 107 to 1010 ions/m3 which leads to conductivities ranging from 10-16 to 10-13 S/m. An experiment has been conducted where the end of a terminated high voltage XLPE cable was used as an insulating structure. The field distribution around the stripped cable end was measured with an applied DC voltage of -140 kV using a rotating field probe. The measurements are compared to simulations, which do not specifically take into account space charge effects. A big discrepancy is observed, showing the relevance of taking into account space charge effects when modeling HVDC insulation components subjected to air.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122756499","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6747415
H. Suzuki, Ando Nozomu, H. Miyake, Y. Tanaka, T. Maeno
We have observed space charge profiles using the PEA (pulsed electro-acoustic) system in low density polyethylene (LDPE) and cross-linked polyethylene (XLPE) under high electric dc field to study a relationship between space charge behavior and dielectric breakdown. XLPE, which is used as an insulating material of ac power cable, is also expected to be applied as the insulating layer of DC long distance power cable. To apply the polymeric materials for the insulating layer of a dc power cable, it is necessary to understand the "space charge" effect under high dc stress. In our previous research works, we have found that a large amount of, so called, packet-like charge generates in LDPE under dc high electric field of more than 100 kV/mm and it enhances the electric field locally in balk of the sample, and finally it leads a breakdown. On the other hand, such breakdown process has not been reported for XLPE yet. Because it was difficult to get a thinner XLPE sample as LDPE was. However, since we need to understand the relationship between the space charge and the breakdown in XLPE, we tried to measure them using specially arranged PEA system for high voltage application. In this report, we investigate the space charge formation and electric breakdown characteristics in XLPE. As the results, it is found that the relationship between the space charge and the breakdown in XLPE is completely different from that in LDPE. Since the XLPE was chemically made from LDPE using cross-linked agent at high temperature. It is assumed that the breakdown strength in XLPE is strongly affected by both of the residues of the cross-linking by products and the heat history.
{"title":"Space charge accumulation and electric breakdown in XLPE under DC high electric field","authors":"H. Suzuki, Ando Nozomu, H. Miyake, Y. Tanaka, T. Maeno","doi":"10.1109/CEIDP.2013.6747415","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747415","url":null,"abstract":"We have observed space charge profiles using the PEA (pulsed electro-acoustic) system in low density polyethylene (LDPE) and cross-linked polyethylene (XLPE) under high electric dc field to study a relationship between space charge behavior and dielectric breakdown. XLPE, which is used as an insulating material of ac power cable, is also expected to be applied as the insulating layer of DC long distance power cable. To apply the polymeric materials for the insulating layer of a dc power cable, it is necessary to understand the \"space charge\" effect under high dc stress. In our previous research works, we have found that a large amount of, so called, packet-like charge generates in LDPE under dc high electric field of more than 100 kV/mm and it enhances the electric field locally in balk of the sample, and finally it leads a breakdown. On the other hand, such breakdown process has not been reported for XLPE yet. Because it was difficult to get a thinner XLPE sample as LDPE was. However, since we need to understand the relationship between the space charge and the breakdown in XLPE, we tried to measure them using specially arranged PEA system for high voltage application. In this report, we investigate the space charge formation and electric breakdown characteristics in XLPE. As the results, it is found that the relationship between the space charge and the breakdown in XLPE is completely different from that in LDPE. Since the XLPE was chemically made from LDPE using cross-linked agent at high temperature. It is assumed that the breakdown strength in XLPE is strongly affected by both of the residues of the cross-linking by products and the heat history.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114245401","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}
The phenomenon of electrical tree in polyethylene affects its service life and application in widely field. Our previous research works have showed that montmorillonite (MMT) introduced can improve electrical tree performance of polyethylene. In the present paper, organic processing methods by using intercalation agent and coupling agent are selected to modify spacing between laminar layers and surface characteristic of nano-montmorillonite. Polyethylene/nano-montmorillonite (PE/MMT) composites are prepared via melting intercalation method, the organic MMT content is 0.5%, 1%, 3%, and 5% in mass fraction respectively. It can be observed that infrared absorbance peaks of PE/MMT reduce by Fourier transform infrared spectrum (FTIR) due to hydrogen bonds formed between organic MMT and PE. The space charge characteristic and electrical tree properties of PE and PE/MMT are investigated. The test results reveal that the interfacial charge peak improved near cathode and internal space charge accumulation decreases obviously in PE/MMT composite. When content of organic montmorillonite is 0.5%, the PE/MMT composite has the minimum length and maximum density of electrical trees. Establish a model which can express the propagation of electrical tree in composite with layered inorganic filler simply, according to the testing results.
{"title":"Research on interface modification and electrical tree of PE/MMT composites","authors":"X. Chi, Junguo Gao, Jiahui Guo, Guowei Zheng, Xiaohong Zhang","doi":"10.1109/CEIDP.2013.6747428","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747428","url":null,"abstract":"The phenomenon of electrical tree in polyethylene affects its service life and application in widely field. Our previous research works have showed that montmorillonite (MMT) introduced can improve electrical tree performance of polyethylene. In the present paper, organic processing methods by using intercalation agent and coupling agent are selected to modify spacing between laminar layers and surface characteristic of nano-montmorillonite. Polyethylene/nano-montmorillonite (PE/MMT) composites are prepared via melting intercalation method, the organic MMT content is 0.5%, 1%, 3%, and 5% in mass fraction respectively. It can be observed that infrared absorbance peaks of PE/MMT reduce by Fourier transform infrared spectrum (FTIR) due to hydrogen bonds formed between organic MMT and PE. The space charge characteristic and electrical tree properties of PE and PE/MMT are investigated. The test results reveal that the interfacial charge peak improved near cathode and internal space charge accumulation decreases obviously in PE/MMT composite. When content of organic montmorillonite is 0.5%, the PE/MMT composite has the minimum length and maximum density of electrical trees. Establish a model which can express the propagation of electrical tree in composite with layered inorganic filler simply, according to the testing results.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115766201","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748251
Yuanxiang Zhou, F. Jin, Meng Huang, Y. Sha, Ling Zhang, Jianwen Huang
In order to study the influence of temperature on surface flashover behavior with oil-paper interface under combined AC-DC voltage, a discharge test assembly was established to investigate the influence of temperature on developing process of surface flashover of oil-paper interface from 25 °C to 90 °C. Based on impulse current method, the process of surface flashover of oil-paper interface under combined AC-DC voltage was studied by electrodes configurations that simulated the tangential electric field and radial electric field of surface of pressboard, in which the voltage was increased step-by-step. Meanwhile the partial discharge (PD) spectrums at whole flashover stages were studied. Moreover, high speed camera was used to record the whole process of surface flashover which was divided into 4 stages: (1)Inception stage, (2)Streamer stage, (3)Intermittent breakdown stage, (4) Surface flashover stage. The experiments results shown that flashover voltage and PD inception voltage at high temperature (HT) was lower than the voltage at low temperature (LT). The average amplitudes of PD at LT were lower than at HT. The growth rate and repetition rate of PD at HT was faster than at LT. It was easier to develop the flashover at oil-paper interface under combined AC and DC voltage at HT. So the flashover voltage was lower at HT. the surface of pressboard was destructed severely at HT, the track of surface discharge was obvious at HT.
{"title":"Influence of temperature on developing process of surface flashover in oil-paper insulation under combined AC-DC voltage","authors":"Yuanxiang Zhou, F. Jin, Meng Huang, Y. Sha, Ling Zhang, Jianwen Huang","doi":"10.1109/CEIDP.2013.6748251","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748251","url":null,"abstract":"In order to study the influence of temperature on surface flashover behavior with oil-paper interface under combined AC-DC voltage, a discharge test assembly was established to investigate the influence of temperature on developing process of surface flashover of oil-paper interface from 25 °C to 90 °C. Based on impulse current method, the process of surface flashover of oil-paper interface under combined AC-DC voltage was studied by electrodes configurations that simulated the tangential electric field and radial electric field of surface of pressboard, in which the voltage was increased step-by-step. Meanwhile the partial discharge (PD) spectrums at whole flashover stages were studied. Moreover, high speed camera was used to record the whole process of surface flashover which was divided into 4 stages: (1)Inception stage, (2)Streamer stage, (3)Intermittent breakdown stage, (4) Surface flashover stage. The experiments results shown that flashover voltage and PD inception voltage at high temperature (HT) was lower than the voltage at low temperature (LT). The average amplitudes of PD at LT were lower than at HT. The growth rate and repetition rate of PD at HT was faster than at LT. It was easier to develop the flashover at oil-paper interface under combined AC and DC voltage at HT. So the flashover voltage was lower at HT. the surface of pressboard was destructed severely at HT, the track of surface discharge was obvious at HT.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123790114","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748338
Chen Ling, Liu Rui, Zhang Fu-zhou
With the advantages of high lighting temperature, easier degradation and renewable, the natural ester-paper insulation has been employed in distribution transformer, gradually. During the operation, the natural ester-paper insulation will deteriorate under the effect of hot, electrical field and moisture. So it is very important to assess the insulation status of ester-paper insulation in transformers. The Frequency Domain Spectroscopy (FDS) has been widely used to assess the insulation status of oil-paper insulation system. But there is little research about the FDS of natural ester and its impregnated paper insulation. This paper studies the influence of temperature and aging on the FDS of natural ester and its impregnated paper based on experiments. And the results show that, the temperature does not change the shape of FDS of natural ester and its impregnated paper, it just changes the position of FDS in the coordinate axis. The aging changes the shape of FDS of ester, obviously, but does not change the basic shape of FDS of ester-impregnated paper.
{"title":"The frequency domain spectroscopy of natural ester and its impregnated paper insulation","authors":"Chen Ling, Liu Rui, Zhang Fu-zhou","doi":"10.1109/CEIDP.2013.6748338","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748338","url":null,"abstract":"With the advantages of high lighting temperature, easier degradation and renewable, the natural ester-paper insulation has been employed in distribution transformer, gradually. During the operation, the natural ester-paper insulation will deteriorate under the effect of hot, electrical field and moisture. So it is very important to assess the insulation status of ester-paper insulation in transformers. The Frequency Domain Spectroscopy (FDS) has been widely used to assess the insulation status of oil-paper insulation system. But there is little research about the FDS of natural ester and its impregnated paper insulation. This paper studies the influence of temperature and aging on the FDS of natural ester and its impregnated paper based on experiments. And the results show that, the temperature does not change the shape of FDS of natural ester and its impregnated paper, it just changes the position of FDS in the coordinate axis. The aging changes the shape of FDS of ester, obviously, but does not change the basic shape of FDS of ester-impregnated paper.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131445963","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748274
Baimei Wang, Jian Li, Junru Xiang, B. Du
Vegetable insulating oil shows good performance in electric, high anti-aging ability and environmental protection. Thus it is considered as a promising substitute for mineral insulating oil. In order to the wide spread application of vegetable oil in large power transformers, this paper presents accelerated aging experiments of oil-paper insulation involving insulating paper and the mixed oil. The mixed oil combined with different proportion of vegetable and mineral insulating oil. The experiments were performed at 130 °C to analyze the generation principle of aging products for different types of oil-paper insulation samples. Experimental results showed that the moisture content of insulating oil and paper increased with increasing of aging time and the different proportion of vegetable and mineral insulating oil during the aging process. Besides, acid value of insulation oil increased with aging time, and acid value was related to the different proportion of vegetable and mineral insulating oil. The degree of polymerization (DP) of the insulation paper decreased with the aging time. However, the DP declining rate decreased with increasing of different proportion of vegetable and mineral insulating oil.
{"title":"Influence of proportion of vegetable insulating oil and mineral insulating oil on thermal aging of oil-paper insulation","authors":"Baimei Wang, Jian Li, Junru Xiang, B. Du","doi":"10.1109/CEIDP.2013.6748274","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748274","url":null,"abstract":"Vegetable insulating oil shows good performance in electric, high anti-aging ability and environmental protection. Thus it is considered as a promising substitute for mineral insulating oil. In order to the wide spread application of vegetable oil in large power transformers, this paper presents accelerated aging experiments of oil-paper insulation involving insulating paper and the mixed oil. The mixed oil combined with different proportion of vegetable and mineral insulating oil. The experiments were performed at 130 °C to analyze the generation principle of aging products for different types of oil-paper insulation samples. Experimental results showed that the moisture content of insulating oil and paper increased with increasing of aging time and the different proportion of vegetable and mineral insulating oil during the aging process. Besides, acid value of insulation oil increased with aging time, and acid value was related to the different proportion of vegetable and mineral insulating oil. The degree of polymerization (DP) of the insulation paper decreased with the aging time. However, the DP declining rate decreased with increasing of different proportion of vegetable and mineral insulating oil.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134203663","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748270
J. Castellon, S. Agnel, S. Diaham, F. Saysouk, Z. Valdez-Nava, D. Fabiani, M. Frechette
Nanocomposite materials are nowadays widely studied. It is often desired, by the addition of nanoparticles in an insulating matrix, to improve electrical and thermal properties. However, few types of nanoparticles enable improvement of combined electrical and thermal properties. Here the influence of the presence of graphene nanoparticles in an epoxy matrix on space charge accumulation is studied. Thus, several percentages of graphene nanoparticles (0.05 wt.%, 0.1 wt.%, 0.5 wt.%), voluntarily chosen below the electrical percolation threshold and an epoxy resin as reference, are studied in order to evaluate the influence of the content of the nanoparticles in the epoxy matrix on space charge accumulation. Space charge measurements have been performed using the Thermal Step Method. The influence of the applied dc electric field and temperature during the poling has also been studied.
{"title":"Space charge accumulation on multilayer graphene/epoxy nanocomposites","authors":"J. Castellon, S. Agnel, S. Diaham, F. Saysouk, Z. Valdez-Nava, D. Fabiani, M. Frechette","doi":"10.1109/CEIDP.2013.6748270","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748270","url":null,"abstract":"Nanocomposite materials are nowadays widely studied. It is often desired, by the addition of nanoparticles in an insulating matrix, to improve electrical and thermal properties. However, few types of nanoparticles enable improvement of combined electrical and thermal properties. Here the influence of the presence of graphene nanoparticles in an epoxy matrix on space charge accumulation is studied. Thus, several percentages of graphene nanoparticles (0.05 wt.%, 0.1 wt.%, 0.5 wt.%), voluntarily chosen below the electrical percolation threshold and an epoxy resin as reference, are studied in order to evaluate the influence of the content of the nanoparticles in the epoxy matrix on space charge accumulation. Space charge measurements have been performed using the Thermal Step Method. The influence of the applied dc electric field and temperature during the poling has also been studied.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"279 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134404555","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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