Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.311931
Z. Han, Changjun Diao, Ying Li, Hong Zhao
Thermal properties of PE/SiO2 nanocomposites are investigated in the paper by Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TG) and differential scanning calorimetry (DSC). Effects of surface treatment of nano-SiO2 on thermal properties of composites are discussed in detail. The results of TG reveal that thermal stabilities of nanocomposites are improved with addition of nano-SiO2 after surface treatment. DSC curves show that the crystallinity is deeply influenced by the presence of SiO2 after surface treatment. The system with higher crystallinity show improved thermal stability. Thermo-oxidative process of PE is delayed by nano-silica after certain surface treatment. PE/SiO2 with well dispersed SiO2 possesses better thermal stability and thermo-oxidative properties.
{"title":"Thermal properties of LDPE/silica nanocomposites","authors":"Z. Han, Changjun Diao, Ying Li, Hong Zhao","doi":"10.1109/CEIDP.2006.311931","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311931","url":null,"abstract":"Thermal properties of PE/SiO2 nanocomposites are investigated in the paper by Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TG) and differential scanning calorimetry (DSC). Effects of surface treatment of nano-SiO2 on thermal properties of composites are discussed in detail. The results of TG reveal that thermal stabilities of nanocomposites are improved with addition of nano-SiO2 after surface treatment. DSC curves show that the crystallinity is deeply influenced by the presence of SiO2 after surface treatment. The system with higher crystallinity show improved thermal stability. Thermo-oxidative process of PE is delayed by nano-silica after certain surface treatment. PE/SiO2 with well dispersed SiO2 possesses better thermal stability and thermo-oxidative properties.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121747241","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312008
S. Ashraf, B. Stewart, C. Zhou, J. M. Jahabar
This paper presents a 3D simulation study of the basic propagation of partial discharge (PD) acoustic emission (AE) signals from structures akin to high voltage equipment such as switchgear. Partial differential equations (PDE) describing the signals have been developed and solved using Finite Element Analysis (FEA) rather than Finite Difference Time Domain (FDTD) which has been used by different authors. The study described in this paper helps to investigate the propagation behaviour of the AE waves at the interface of two different media namely oil and steel. Reflection, refraction and scattering of the PD shock waves are simulated and displayed in 3-D model. The results show that the signals can alter significantly based on the location of the PD and also the properties of the oil and steel, particularly temperature. This is a new result and particularly important in relation to the interpretation and understanding of practically measured AE PD signals. The work presented here will therefore assist in PD diagnosis and aid in understanding better the properties and characteristic of acoustic PD activity.
{"title":"3-D Simulation and Modelling of Acoustic Signals from Partial Discharge Activity","authors":"S. Ashraf, B. Stewart, C. Zhou, J. M. Jahabar","doi":"10.1109/CEIDP.2006.312008","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312008","url":null,"abstract":"This paper presents a 3D simulation study of the basic propagation of partial discharge (PD) acoustic emission (AE) signals from structures akin to high voltage equipment such as switchgear. Partial differential equations (PDE) describing the signals have been developed and solved using Finite Element Analysis (FEA) rather than Finite Difference Time Domain (FDTD) which has been used by different authors. The study described in this paper helps to investigate the propagation behaviour of the AE waves at the interface of two different media namely oil and steel. Reflection, refraction and scattering of the PD shock waves are simulated and displayed in 3-D model. The results show that the signals can alter significantly based on the location of the PD and also the properties of the oil and steel, particularly temperature. This is a new result and particularly important in relation to the interpretation and understanding of practically measured AE PD signals. The work presented here will therefore assist in PD diagnosis and aid in understanding better the properties and characteristic of acoustic PD activity.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125010890","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312095
M. Kouzai, T. Ogiwara, A. Nishikata, K. Fukunaga
Complex permittivities of various polymeric materials used as insulation layers of printed circuit boards were measured at frequency range from 1 MHz to 110 GHz by using a newly developed waveguide penetration dielectric measurement system and four commercial systems. The new system has been originally developed for measuring lossy liquid specimens, such as tissue-equivalent liquids, and can also measure the complex permittivity of rod shape solid or thin film specimens, without reference materials. Experimental results reveal that the data measured by four different methods were in good agreement. The dielectric loss tan delta of most of insulation layers can become more than 0.01 at GHz order and the anisotropy is considerably high. This work can contribute to clarify the dielectric properties of materials used in printed circuit boards that would affect the total loss of components.
{"title":"Dielectric Properties of Insulating Materials for Printed Circuit Boards at mm-Waves","authors":"M. Kouzai, T. Ogiwara, A. Nishikata, K. Fukunaga","doi":"10.1109/CEIDP.2006.312095","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312095","url":null,"abstract":"Complex permittivities of various polymeric materials used as insulation layers of printed circuit boards were measured at frequency range from 1 MHz to 110 GHz by using a newly developed waveguide penetration dielectric measurement system and four commercial systems. The new system has been originally developed for measuring lossy liquid specimens, such as tissue-equivalent liquids, and can also measure the complex permittivity of rod shape solid or thin film specimens, without reference materials. Experimental results reveal that the data measured by four different methods were in good agreement. The dielectric loss tan delta of most of insulation layers can become more than 0.01 at GHz order and the anisotropy is considerably high. This work can contribute to clarify the dielectric properties of materials used in printed circuit boards that would affect the total loss of components.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"390 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131518130","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312074
A. Akbari, H. Firoozi, H. Borsi, M. Kharezi
The drying process is one of the most important tasks in transformers manufacturing stages. The drying quality in this stage is directly proportional to transformer lifetime. In this contribution, drying process at manufacturing site has been evaluated by use of frequency response analysis (FRA). The measured transfer functions of power transformer during the stage of drying are analyzed. Using artificial neural network (ANN), a method has been proposed to give an estimate for required time for drying process. Results show that the ANN could well forecast the required time for drying if the ANN is trained using the measured patterns. The estimation obtained from this method is valid for all the transformers which have the same design.
{"title":"Assessment of Drying Quality for Power Transformer during Manufacturing Process Using Variation of Transfer Function","authors":"A. Akbari, H. Firoozi, H. Borsi, M. Kharezi","doi":"10.1109/CEIDP.2006.312074","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312074","url":null,"abstract":"The drying process is one of the most important tasks in transformers manufacturing stages. The drying quality in this stage is directly proportional to transformer lifetime. In this contribution, drying process at manufacturing site has been evaluated by use of frequency response analysis (FRA). The measured transfer functions of power transformer during the stage of drying are analyzed. Using artificial neural network (ANN), a method has been proposed to give an estimate for required time for drying process. Results show that the ANN could well forecast the required time for drying if the ANN is trained using the measured patterns. The estimation obtained from this method is valid for all the transformers which have the same design.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131331399","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311933
P. Ciambelli, B. D. Vivo, G. Gorrasi, Valentina Romeo, D. Sannino, M. Sarno, Vincenzo Tucci, V. Vittoria
Carbon nanotubes composites can be profitably employed in different engineering applications due to their remarkable properties. In this research we have examined composites of syndiotactic Poly(propylene) (sPP) loaded with 1, 3 and 10 % wt/wt of Multi Walled Carbon Nanotubes (MWCNTs). The physical and electrical properties of films produced by employing melt extrusion and by using two different quenching temperatures from the melt (25degC and 100degC) are studied. The presence of nanoparticles affects the structure and morphology of the matrix, increasing the crystallization kinetics and leading to more disordered forms, even for the higher quenching temperature. The composites reach high conductivity values with a CNTs content lower than that reported for other systems implying good dispersion of the CNTs in the sPP matrix.
{"title":"Electrical Properties of Carbon Nanotubes - Syndiotactic Polypropylene Composites","authors":"P. Ciambelli, B. D. Vivo, G. Gorrasi, Valentina Romeo, D. Sannino, M. Sarno, Vincenzo Tucci, V. Vittoria","doi":"10.1109/CEIDP.2006.311933","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311933","url":null,"abstract":"Carbon nanotubes composites can be profitably employed in different engineering applications due to their remarkable properties. In this research we have examined composites of syndiotactic Poly(propylene) (sPP) loaded with 1, 3 and 10 % wt/wt of Multi Walled Carbon Nanotubes (MWCNTs). The physical and electrical properties of films produced by employing melt extrusion and by using two different quenching temperatures from the melt (25degC and 100degC) are studied. The presence of nanoparticles affects the structure and morphology of the matrix, increasing the crystallization kinetics and leading to more disordered forms, even for the higher quenching temperature. The composites reach high conductivity values with a CNTs content lower than that reported for other systems implying good dispersion of the CNTs in the sPP matrix.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116562428","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311985
M. Yagi, K. Okabe, Y. Mizuno, T. Nakagawa
Tracking of a plug for household appliance connected to an outlet is considered one of causes of fire, which is observed when dust is accumulated in the space between the plug and the outlet and wetted by dew condensation. It is strongly requested to detect the tracking in order to interrupt power supply before starting fire. This paper reports a series of fundamental studies on current characteristics flowing on a plug surface between electrodes under artificially contaminated and wetted conditions. Tracking was observed on plug and outlet surfaces in an accelerated test using electrolyte.
{"title":"Characteristics of current flowing on plug under contaminated and wetted condition","authors":"M. Yagi, K. Okabe, Y. Mizuno, T. Nakagawa","doi":"10.1109/CEIDP.2006.311985","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311985","url":null,"abstract":"Tracking of a plug for household appliance connected to an outlet is considered one of causes of fire, which is observed when dust is accumulated in the space between the plug and the outlet and wetted by dew condensation. It is strongly requested to detect the tracking in order to interrupt power supply before starting fire. This paper reports a series of fundamental studies on current characteristics flowing on a plug surface between electrodes under artificially contaminated and wetted conditions. Tracking was observed on plug and outlet surfaces in an accelerated test using electrolyte.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134286571","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311955
B. Pinnangudi, R. Gorur, C. Poweleit
A laser irradiation technique has been used to determine the threshold energy for degradation in silicone rubber, ethylene propylene diene monomer and epoxy materials. Silicone rubber exhibited an impulsive or step degradation behavior while ethylene propylene diene monomer and epoxy samples indicated an exponential trend. The temperatures required to initiate degradation in these samples were calculated from laser photo-thermal models and the results were found to be in good agreement with the experimental values obtained from thermogravimetric analysis.
{"title":"Damage Threshold of Polymeric Housing Materials Used for Outdoor HV Insulators","authors":"B. Pinnangudi, R. Gorur, C. Poweleit","doi":"10.1109/CEIDP.2006.311955","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311955","url":null,"abstract":"A laser irradiation technique has been used to determine the threshold energy for degradation in silicone rubber, ethylene propylene diene monomer and epoxy materials. Silicone rubber exhibited an impulsive or step degradation behavior while ethylene propylene diene monomer and epoxy samples indicated an exponential trend. The temperatures required to initiate degradation in these samples were calculated from laser photo-thermal models and the results were found to be in good agreement with the experimental values obtained from thermogravimetric analysis.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116703323","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311927
F. Guastavino, A. Dardano, G. Montanari, F. Deorsola, L. Testa
This work deals with the growth of electrical treeing in different EVA-layered silicate nanostructured compounds. The experimental activity evidenced that the intercalated nanocomposites have longer lifetimes than pure EVA under the same constant AC stress conditions. A monitoring of the tree growth morphology allowed to evidence very interesting features of the intercalated nanocompounds showing a barrier effect to the treeing path. A preliminary investigation on the possible arrangement of the filler particles inside the matrix was also carried out.
{"title":"Electrical tree growth in EVA-layered silicate nanocomposites","authors":"F. Guastavino, A. Dardano, G. Montanari, F. Deorsola, L. Testa","doi":"10.1109/CEIDP.2006.311927","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311927","url":null,"abstract":"This work deals with the growth of electrical treeing in different EVA-layered silicate nanostructured compounds. The experimental activity evidenced that the intercalated nanocomposites have longer lifetimes than pure EVA under the same constant AC stress conditions. A monitoring of the tree growth morphology allowed to evidence very interesting features of the intercalated nanocompounds showing a barrier effect to the treeing path. A preliminary investigation on the possible arrangement of the filler particles inside the matrix was also carried out.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114569259","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312044
A. Hashem, M. Abdel-Salam, A. Turky, A. Abdel-Aziz
This paper is aimed at investigating how the DC corona performance of conductor-to-plane gaps as influenced by a floating grid of metallic parallel wires underneath and parallel to the stressed conductor. The corona current-voltage and corona current density distribution at ground level are studied experimentally with and without floating grids. The wire-to-wire spacing, number, lateral distribution and height of grid wires are varied. It is found that the number and distribution of grid wires are the major factors that influence the corona onset voltage.
{"title":"Corona Characteristics in Conductor-to-Plane Gaps as Influenced by Nearby Floating Metallic Grids","authors":"A. Hashem, M. Abdel-Salam, A. Turky, A. Abdel-Aziz","doi":"10.1109/CEIDP.2006.312044","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312044","url":null,"abstract":"This paper is aimed at investigating how the DC corona performance of conductor-to-plane gaps as influenced by a floating grid of metallic parallel wires underneath and parallel to the stressed conductor. The corona current-voltage and corona current density distribution at ground level are studied experimentally with and without floating grids. The wire-to-wire spacing, number, lateral distribution and height of grid wires are varied. It is found that the number and distribution of grid wires are the major factors that influence the corona onset voltage.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122333137","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311980
H. Ding, Z. Wang
This paper describes briefly various different degradation kinetic models of cellulose and paper insulation in the literature and presents a new cumulative degradation kinetic model for loss of tensile strength of cellulose and paper insulation. Applying this model, the predicted loss of tensile strength has been compared with accelerated ageing data of Kraft paper obtained from the publications of McShane et al. of Cooper Power System. McShane et al. conducted the ageing of Kraft paper in both mineral oil and natural ester in sealed tube at elevated temperatures. It is shown that the cumulative degradation kinetic model for loss of tensile strength of paper insulation can give an excellent description of the ageing process of Kraft paper insulation in both natural ester dielectric fluid and mineral transformer oil.
本文简要介绍了文献中纤维素和纸绝缘材料的各种降解动力学模型，提出了一种新的纤维素和纸绝缘材料抗拉强度损失的累积降解动力学模型。应用该模型，将预测的抗拉强度损失与从Cooper Power System的McShane等人的出版物中获得的卡夫纸加速老化数据进行了比较。McShane等人在密封管中对牛皮纸进行了矿物油和天然酯的高温老化。结果表明，纸绝缘抗拉强度损失的累积降解动力学模型可以很好地描述牛皮纸绝缘在天然酯介质和矿物变压器油中的老化过程。
{"title":"Kinetic analysis and modelling of the ageing process for Kraft paper aged in natural ester dielectric fluid","authors":"H. Ding, Z. Wang","doi":"10.1109/CEIDP.2006.311980","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311980","url":null,"abstract":"This paper describes briefly various different degradation kinetic models of cellulose and paper insulation in the literature and presents a new cumulative degradation kinetic model for loss of tensile strength of cellulose and paper insulation. Applying this model, the predicted loss of tensile strength has been compared with accelerated ageing data of Kraft paper obtained from the publications of McShane et al. of Cooper Power System. McShane et al. conducted the ageing of Kraft paper in both mineral oil and natural ester in sealed tube at elevated temperatures. It is shown that the cumulative degradation kinetic model for loss of tensile strength of paper insulation can give an excellent description of the ageing process of Kraft paper insulation in both natural ester dielectric fluid and mineral transformer oil.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124757418","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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