Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772812
S. Okada, K. Fukunaga, K. Yamaguchi, S. Ohtsuka, K. Kimura, M. Hikita
For PD detection of converter-fed motor windings, electromagnetic wave is one of the promising signals because of remote detection. This paper described fundamental relations of electromagnetic wave and other optical and electric signals from PD using crossed magnetic wires under repetitive impulses. Detection capability of plural PD pulses under one voltage impulse is discussed in detail.
{"title":"Comparison of Electromagnetic Wave, Light Intensity and Electric Charge of PD on Crossed Magnet Wires under Repetitive Impulses","authors":"S. Okada, K. Fukunaga, K. Yamaguchi, S. Ohtsuka, K. Kimura, M. Hikita","doi":"10.1109/CEIDP.2008.4772812","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772812","url":null,"abstract":"For PD detection of converter-fed motor windings, electromagnetic wave is one of the promising signals because of remote detection. This paper described fundamental relations of electromagnetic wave and other optical and electric signals from PD using crossed magnetic wires under repetitive impulses. Detection capability of plural PD pulses under one voltage impulse is discussed in detail.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"12 1","pages":"391-394"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81973223","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772764
Y. Nakamura, H. Inano, S. Hiroshima, T. Hirose, M. Hamaguchi, H. Okubo
This paper discusses the partial discharge (PD) resistant mechanism of nanocomposite enamel wires under repetitive surge voltage condition for inverter-fed motors. We focused on the reduction of deterioration depth and the surface condition of nanocomposite enamel wires after repetitive surge voltage application with successive PD. Experimental results revealed that the longer lifetime of breakdown of nanocomposite enamel wires compared with the conventional wires would be brought about not only by the filled nano materials, but also by their byproduct on the enamel surface under repetitive PD generation. The erosion of nanocomposite enamel layers was suppressed in depth by the byproduct and dispersed in the longitudinal direction along the enamel surface, which could contribute to the longer lifetime of breakdown than conventional wires.
{"title":"Partial Discharge Resistant Aging Mechanism of Nanocomposite Enamel Wires under Repetitive Surge Voltage Condition","authors":"Y. Nakamura, H. Inano, S. Hiroshima, T. Hirose, M. Hamaguchi, H. Okubo","doi":"10.1109/CEIDP.2008.4772764","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772764","url":null,"abstract":"This paper discusses the partial discharge (PD) resistant mechanism of nanocomposite enamel wires under repetitive surge voltage condition for inverter-fed motors. We focused on the reduction of deterioration depth and the surface condition of nanocomposite enamel wires after repetitive surge voltage application with successive PD. Experimental results revealed that the longer lifetime of breakdown of nanocomposite enamel wires compared with the conventional wires would be brought about not only by the filled nano materials, but also by their byproduct on the enamel surface under repetitive PD generation. The erosion of nanocomposite enamel layers was suppressed in depth by the byproduct and dispersed in the longitudinal direction along the enamel surface, which could contribute to the longer lifetime of breakdown than conventional wires.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"13 1","pages":"375-378"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87870037","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772796
É. David, A. Sami, R. Soltani, M. Frechette, S. Savoie
The low-frequency dielectric response of polymeric materials, typically in the range of 10-5 to 102 Hz at room temperature, is related to various phenomena. Direct conduction, quasi DC conduction also known as low-frequency dispersion, alpha dipolar relaxation mechanisms, which are located in the low-frequency part of the spectrum for glassy polymers, are included in these phenomena and appeared generally below 1 Hz. The presence of a load, nano or micrometric in size, is known to significantly affect the low-frequency dielectric properties of the based matrix. New mechanisms related to the morphology and interfacial effects, such as the Maxwell-Wagner interfacial polarization, could then superimpose to the already existing relaxation mechanisms. In order to further investigate the low-frequency response of various reinforced epoxy-based composites, both time and frequency domain spectroscopy were conducted. Different types of epoxy microcomposites containing a high content of quartz, i.e. 60% wt. and microcomposites load with SiC particles, were prepared. Measurements were also performed on epoxy-mica composite made of paper-backed mica flakes bonded by the resin.
{"title":"Low-Frequency Dielectric Response of Epoxy-Based Polymer Composites","authors":"É. David, A. Sami, R. Soltani, M. Frechette, S. Savoie","doi":"10.1109/CEIDP.2008.4772796","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772796","url":null,"abstract":"The low-frequency dielectric response of polymeric materials, typically in the range of 10-5 to 102 Hz at room temperature, is related to various phenomena. Direct conduction, quasi DC conduction also known as low-frequency dispersion, alpha dipolar relaxation mechanisms, which are located in the low-frequency part of the spectrum for glassy polymers, are included in these phenomena and appeared generally below 1 Hz. The presence of a load, nano or micrometric in size, is known to significantly affect the low-frequency dielectric properties of the based matrix. New mechanisms related to the morphology and interfacial effects, such as the Maxwell-Wagner interfacial polarization, could then superimpose to the already existing relaxation mechanisms. In order to further investigate the low-frequency response of various reinforced epoxy-based composites, both time and frequency domain spectroscopy were conducted. Different types of epoxy microcomposites containing a high content of quartz, i.e. 60% wt. and microcomposites load with SiC particles, were prepared. Measurements were also performed on epoxy-mica composite made of paper-backed mica flakes bonded by the resin.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"5 1","pages":"505-508"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90059122","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772797
J. Crine
The differences between AC and DC aging are pointed out and are partly due to the different dissipated energy under the two types of field and partly due to the fatigue induced by the alternating stress. In addition to these effects, the sample size has also a considerable impact on both aging and breakdown. It is shown, from well known existing data, that the aging characteristics of polyethylene and XLPE under DC field in air could be easily extrapolated from data obtained with the same size sample but aged in air under AC field. This approach has the merit to avoid long DC tests whose results might easily be predicted from much shorter AC tests. It is also suggested that this approach might be used to analyze the results of other electrical properties measurements of various polymers.
{"title":"AC and DC Electrical Aging of Polyethylene","authors":"J. Crine","doi":"10.1109/CEIDP.2008.4772797","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772797","url":null,"abstract":"The differences between AC and DC aging are pointed out and are partly due to the different dissipated energy under the two types of field and partly due to the fatigue induced by the alternating stress. In addition to these effects, the sample size has also a considerable impact on both aging and breakdown. It is shown, from well known existing data, that the aging characteristics of polyethylene and XLPE under DC field in air could be easily extrapolated from data obtained with the same size sample but aged in air under AC field. This approach has the merit to avoid long DC tests whose results might easily be predicted from much shorter AC tests. It is also suggested that this approach might be used to analyze the results of other electrical properties measurements of various polymers.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"13 1","pages":"60-62"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90634550","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772834
B. Sarang, P. Basappa, V. Lakdawala
Presence of water droplets over the insulator surface enhances the electric field intensity and leads to electrical breakdown. This is important for outdoor insulation because the combination of moisture and contamination causes flashover at operating voltage; hence affects reliability of power delivery. Electric field has been calculated on insulating surfaces for different patterns of wetting. Simulations have been conducted by varying the number of water droplets, their relative positions and contact angle on the insulator surface in the sheath region. They are simulated using a 3D Electric Field Analysis computer package (Coulomb). One important outcome of this work, is that location of the water droplets with respect to electrodes and other droplets are crucial in determining the maximum E-Field intensity and hence the flash over voltage.
{"title":"Electric field calculations of wet insulating surfaces","authors":"B. Sarang, P. Basappa, V. Lakdawala","doi":"10.1109/CEIDP.2008.4772834","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772834","url":null,"abstract":"Presence of water droplets over the insulator surface enhances the electric field intensity and leads to electrical breakdown. This is important for outdoor insulation because the combination of moisture and contamination causes flashover at operating voltage; hence affects reliability of power delivery. Electric field has been calculated on insulating surfaces for different patterns of wetting. Simulations have been conducted by varying the number of water droplets, their relative positions and contact angle on the insulator surface in the sheath region. They are simulated using a 3D Electric Field Analysis computer package (Coulomb). One important outcome of this work, is that location of the water droplets with respect to electrodes and other droplets are crucial in determining the maximum E-Field intensity and hence the flash over voltage.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"63 1","pages":"228-231"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89111247","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}
Partial discharges (PD) deteriorate insulation of power apparatus and lead to final failure. Early detection and localization of PD can avoid unwanted failure of power apparatus. There are different techniques for PD detection. Acoustic emission technique for partial discharge detection is advantageous for online detection and source location. Normally, acoustic PD detection and location is based on the assumption of a single PD source. But in practice, more than one source of PD is present and they may be active simultaneously in a power apparatus. This paper addresses the identification and localization of two simultaneous PD sources employing acoustic emission technique in oil pressboard insulation system. The PDAE signals from two simultaneous PD sources are analyzed using wavelet analysis with time frequency resolution and Independent Component Analysis for identification and localization.
{"title":"Identification and Localization of Multi-source Partial Discharges by Acoustic Measurements in Oil-pressboard Insulation System","authors":"Prasanta Kundu, Navneet Kishore, Avinash Kumar Sinha","doi":"10.1109/CEIDP.2008.4772781","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772781","url":null,"abstract":"Partial discharges (PD) deteriorate insulation of power apparatus and lead to final failure. Early detection and localization of PD can avoid unwanted failure of power apparatus. There are different techniques for PD detection. Acoustic emission technique for partial discharge detection is advantageous for online detection and source location. Normally, acoustic PD detection and location is based on the assumption of a single PD source. But in practice, more than one source of PD is present and they may be active simultaneously in a power apparatus. This paper addresses the identification and localization of two simultaneous PD sources employing acoustic emission technique in oil pressboard insulation system. The PDAE signals from two simultaneous PD sources are analyzed using wavelet analysis with time frequency resolution and Independent Component Analysis for identification and localization.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"112 1","pages":"383-386"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90815363","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772844
A. Bouaicha, I. Fofana, M. Farzaneh
Aging of different oil-pressboard insulation ratios was investigated under controlled laboratory conditions. Modern diagnostic tools and techniques were used to assess the degree of influence of the relative amount of cellulosic materials on aged mineral oil decay products. Determination of relative content of dissolved decay products by spectrophotometry, solid suspension by turbidimetry, Fourier transform infrared spectroscopy, and electrical diagnostic techniques were used to judge the most affected oil parameters by oil/pressboard proportion and thus the most effective way to choose the best proportion that can reduce solid insulation degradation and increase power transformers lifespan. A quantitative study of the effect caused by the ratio of oil and paper can help to a better modeling of solid insulation end of life.
{"title":"Influence of the Relative Amount of Paper on Aged Mineral Oil Decay Products","authors":"A. Bouaicha, I. Fofana, M. Farzaneh","doi":"10.1109/CEIDP.2008.4772844","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772844","url":null,"abstract":"Aging of different oil-pressboard insulation ratios was investigated under controlled laboratory conditions. Modern diagnostic tools and techniques were used to assess the degree of influence of the relative amount of cellulosic materials on aged mineral oil decay products. Determination of relative content of dissolved decay products by spectrophotometry, solid suspension by turbidimetry, Fourier transform infrared spectroscopy, and electrical diagnostic techniques were used to judge the most affected oil parameters by oil/pressboard proportion and thus the most effective way to choose the best proportion that can reduce solid insulation degradation and increase power transformers lifespan. A quantitative study of the effect caused by the ratio of oil and paper can help to a better modeling of solid insulation end of life.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"59 2 1","pages":"91-94"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90937875","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772938
Qing Yang, Licheng Li, W. Sima, Li Xiaolin, Jian Li, B. Luo
Based on finite element method and the asymptotic boundary condition, the paper presents a new calculation method for unbounded field problem with complex parts by the domain-decomposition and iterative processes. Firstly, the field domain should be decomposed to two parts. One is the concerned domain with finer meshes, the other is the unbounded space domain with coarser meshes. And the two parts have a common domain. Secondly, the concerned domain and the unbounded space domain are calculated separately by the iterative process on the common domain based on the finite element method until the result become stable. This method uses less time to calculation the complex field model and has more accuracy on the concerned domain. It also makes the asymptotic boundary condition to get more accuracy than a further boundary without too much computing time. The paper calculates a 3D model of 800 kV composite insulator with tower conductors and shielding wires. Calculation on the composite insulator of plusmn800 kV UHV DC transmission lines proves the advantage of the method. In the end, the verification tests show good agreement between calculations and measurements.
{"title":"Electric Field Calculation of 800kV Composite Insulator with Domain-decomposition and Iterative Method","authors":"Qing Yang, Licheng Li, W. Sima, Li Xiaolin, Jian Li, B. Luo","doi":"10.1109/CEIDP.2008.4772938","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772938","url":null,"abstract":"Based on finite element method and the asymptotic boundary condition, the paper presents a new calculation method for unbounded field problem with complex parts by the domain-decomposition and iterative processes. Firstly, the field domain should be decomposed to two parts. One is the concerned domain with finer meshes, the other is the unbounded space domain with coarser meshes. And the two parts have a common domain. Secondly, the concerned domain and the unbounded space domain are calculated separately by the iterative process on the common domain based on the finite element method until the result become stable. This method uses less time to calculation the complex field model and has more accuracy on the concerned domain. It also makes the asymptotic boundary condition to get more accuracy than a further boundary without too much computing time. The paper calculates a 3D model of 800 kV composite insulator with tower conductors and shielding wires. Calculation on the composite insulator of plusmn800 kV UHV DC transmission lines proves the advantage of the method. In the end, the verification tests show good agreement between calculations and measurements.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"2020 1","pages":"345-348"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77402192","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772936
V. Nimbole, V. Lakdawala, P. Basappa
Partial Discharges (PD) studies have been traditionally used to monitor tree growth in electrical insulation. In this work polymethyl methacrylate (PMMA) samples with a needle plane gap have been aged with AC voltage. The tree growth is monitored simultaneously with collection of PD at regular intervals of time and taking microphotographs in real time without interrupting the aging voltage. The partial discharge pulse amplitude records are clustered together into groups of class intervals. The sequence of PD pulse height records are quantified as time series of eta (shape) and sigma (scale) of Weibull distribution. An auto regressive (AR) model has been devised in MATLAB for analyses and prediction of eta and sigma. Linear prediction method has been used to verify the results.
{"title":"Prediction of Partial Discharge Pulse Height Distribution Parameters using Linear Prediction Method","authors":"V. Nimbole, V. Lakdawala, P. Basappa","doi":"10.1109/CEIDP.2008.4772936","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772936","url":null,"abstract":"Partial Discharges (PD) studies have been traditionally used to monitor tree growth in electrical insulation. In this work polymethyl methacrylate (PMMA) samples with a needle plane gap have been aged with AC voltage. The tree growth is monitored simultaneously with collection of PD at regular intervals of time and taking microphotographs in real time without interrupting the aging voltage. The partial discharge pulse amplitude records are clustered together into groups of class intervals. The sequence of PD pulse height records are quantified as time series of eta (shape) and sigma (scale) of Weibull distribution. An auto regressive (AR) model has been devised in MATLAB for analyses and prediction of eta and sigma. Linear prediction method has been used to verify the results.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"127 1","pages":"337-340"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79547667","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772933
S. Okuzumi, Y. Murakami, M. Nagao, Y. Sekiguchi, C. Reddy, Y. Murata
A nano-composite material is attracting many researchers' attention in the field of dielectric and electrical insulation. The purpose of this study is to investigate the influence of MgO filler size on electrical properties of MgO/LDPE nanocomposite. The volume resistivity, DC breakdown strength and the impulse breakdown strength of low-density polyethylene (LDPE) containing nano-filler or micro-filler of magnesium oxide (MgO) were measured. The volume resistivity of the sample without the MgO filler increases by addition of the MgO nano-filler or the MgO micro-filler. The impulse breakdown strength and the DC breakdown strength of the sample without the MgO filler measured with McKeown type electrode increases by the addition of the MgO nano-filler but that does not increase by the addition of the MgO micro-filler. From the result, it becomes clear that the addition of the MgO nano-filler is suitable for the DC insulating material rather than that of the MgO micro-filler.
{"title":"DC Breakdown Strength and Conduction Current of MgO/LDPE Composite Influenced by Filler Size","authors":"S. Okuzumi, Y. Murakami, M. Nagao, Y. Sekiguchi, C. Reddy, Y. Murata","doi":"10.1109/CEIDP.2008.4772933","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772933","url":null,"abstract":"A nano-composite material is attracting many researchers' attention in the field of dielectric and electrical insulation. The purpose of this study is to investigate the influence of MgO filler size on electrical properties of MgO/LDPE nanocomposite. The volume resistivity, DC breakdown strength and the impulse breakdown strength of low-density polyethylene (LDPE) containing nano-filler or micro-filler of magnesium oxide (MgO) were measured. The volume resistivity of the sample without the MgO filler increases by addition of the MgO nano-filler or the MgO micro-filler. The impulse breakdown strength and the DC breakdown strength of the sample without the MgO filler measured with McKeown type electrode increases by the addition of the MgO nano-filler but that does not increase by the addition of the MgO micro-filler. From the result, it becomes clear that the addition of the MgO nano-filler is suitable for the DC insulating material rather than that of the MgO micro-filler.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"722-725"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82952129","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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