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Ceramic-metal composite to recover the bulk property of ceramic powder 利用陶瓷-金属复合材料恢复陶瓷粉末的体积特性
2008 International Symposium on Electrical Insulating Materials (ISEIM 2008) Pub Date : 2008-10-31 DOI: 10.1109/ISEIM.2008.4664454
Kai Wu, Yonghong Cheng, Xiaolin Chen
{"title":"Ceramic-metal composite to recover the bulk property of ceramic powder","authors":"Kai Wu, Yonghong Cheng, Xiaolin Chen","doi":"10.1109/ISEIM.2008.4664454","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664454","url":null,"abstract":"An interval percolation model was put forward to describe the ceramic-metal composite, in which the contact resistance of ceramic powder was reduced so that the bulk property of the ceramic could be recovered. Monte-Carlo simulation confirmed that the bulk property can be surely recovered in a cubic network if the fraction of conductive sites is in the range of 0.101 to 0.311. Experimental works also indicated that the bulk property of positive temperature coefficient (PTC) of BaTiO3 was recovered after the mixture of the BaTiO3 ceramic powder and silver ink was baked. Moreover, it was shown that the percolation threshold decreased with the increase of the size of ceramic particles, and the PTC bulk property appeared more obviously at higher electrical field. This may provide a new way for the polymer/ceramic composite.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"449 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123041264","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}
引用次数: 0
Electrification and space charge under electric stress in high temperature on epoxy resin 环氧树脂在高温电应力下的带电和空间电荷
2008 International Symposium on Electrical Insulating Materials (ISEIM 2008) Pub Date : 2008-10-31 DOI: 10.1109/ISEIM.2008.4664441
M. Fukuma, K. Ishiduki, S. Kotake
{"title":"Electrification and space charge under electric stress in high temperature on epoxy resin","authors":"M. Fukuma, K. Ishiduki, S. Kotake","doi":"10.1109/ISEIM.2008.4664441","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664441","url":null,"abstract":"The semiconductor devices which used the electric field effect have the possibility to cause the malfunction due to the electrification. There is a case in which the anti-static additives (ASA) are used in order to avoid malfunction due to the electrification of the epoxy resin. In this report, the electrification phenomena under electric field stress in a high temperature (3-6 kV/mm, 100-155degC) in epoxy resin have been observed on the effect of ASA by using one-and two- dimensional space charge distribution measurement system. From the results of space charge measurement, it was found that the epoxy resin with ASA have made the following effect to the space charge formation by the high-temperature(100,155degC) and electric field charging (10 kV/1.5 mm, 6 kV/1.5 mm). It is considered that the ASA reduce the hetero electric field near the electrode interface; the appropriate quantity addition of the ASA to the epoxy resin is effective for relaxation of the electrification of the epoxy resin in the high temperature.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124410313","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}
引用次数: 0
Variation of leakage current caused by hydrophobicity loss of silicone rubber in Dynamic Drop Test 动态跌落试验中硅橡胶疏水性损失引起的泄漏电流变化
2008 International Symposium on Electrical Insulating Materials (ISEIM 2008) Pub Date : 2008-10-31 DOI: 10.1109/ISEIM.2008.4664509
Y. Kurimoto, Y. Tashiro, Y. Murakami, H. Homma, M. Nagao
{"title":"Variation of leakage current caused by hydrophobicity loss of silicone rubber in Dynamic Drop Test","authors":"Y. Kurimoto, Y. Tashiro, Y. Murakami, H. Homma, M. Nagao","doi":"10.1109/ISEIM.2008.4664509","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664509","url":null,"abstract":"Silicone rubber used for polymeric insulators has good hydrophobicity and recovery characteristic of it. CIGRE WG D1.14 aims to establish new test procedure, dynamic drop test. That can evaluate the property of hydrophobicity loss of silicone rubber easily and with small systems. So, we clarified the relation between processes of hydrophobicity deterioration or loss and leakage current waveform in dynamic drop test. The hydrophobic conditions were classified into three categories. In the condition of keeping hydrophobicity, pulse discharges were repeatedly observed at the time when droplets ran down. As hydrophobicity deteriorated, small water droplets remained on the surface and many pulse discharges were observed when the droplets ran down. The tendency of the current ingredient of 60 Hz became more dominant and discharge light started to be observed continuously regardless of the timing of the droplets just before when hydrophobicity lost. Then it was considered that a thin moisture layer was formed on the surface, although only droplets were observed with the naked eye. Finally, the leakage current flowed continuously.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127754464","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}
引用次数: 12
Dependence of filler size on space charge formation in LDPE/MgO under high electric field at high temperature 高温高电场作用下LDPE/MgO填料尺寸对空间电荷形成的影响
2008 International Symposium on Electrical Insulating Materials (ISEIM 2008) Pub Date : 2008-10-31 DOI: 10.1109/ISEIM.2008.4664516
T. Maezawa, Y. Kishi, Y. Tanaka, T. Takada, Y. Murata, Y. Sekiguchi, M. Goshowaki
{"title":"Dependence of filler size on space charge formation in LDPE/MgO under high electric field at high temperature","authors":"T. Maezawa, Y. Kishi, Y. Tanaka, T. Takada, Y. Murata, Y. Sekiguchi, M. Goshowaki","doi":"10.1109/ISEIM.2008.4664516","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664516","url":null,"abstract":"Space charge behavior has been investigated in LDPE/MgO composite films including the different size of MgO particles with a diameter of several tens nm (nano) or a few mum (micro) when a dc high stress is applied to the sample at high temperature. It is believed that a positive packet-like charge is injected from the anode, and after that a negative packet charge is injected from the cathode. In the samples with relatively low content of MgO, the apparent velocity of positive packet-like charge in LDPE/MgO (nano) is faster than that in LDPE/MgO (micro) at a field of 150 kV/mm. Such generation of charges causes the enhancement of local electric field in the sample. However, almost no packet-like charge was observed in the sample with relatively high content of MgO irrespective of the filler size. It is considered that the addition of MgO filler to LDPE plays a role to reduce the enhancement of the electric field in the sample by suppression of both the positive and the negative charge injection into the sample.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127880340","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}
引用次数: 9
Electrical trees in inner and outer layer of different voltage rating XLPE cable insulation 电气树在内外层对不同电压等级的交联聚乙烯电缆进行绝缘
2008 International Symposium on Electrical Insulating Materials (ISEIM 2008) Pub Date : 2008-10-31 DOI: 10.1109/ISEIM.2008.4664573
A. Xie, X.Q. Zheng, S.T. Li
{"title":"Electrical trees in inner and outer layer of different voltage rating XLPE cable insulation","authors":"A. Xie, X.Q. Zheng, S.T. Li","doi":"10.1109/ISEIM.2008.4664573","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664573","url":null,"abstract":"The statistical initiation and propagation characteristics of electrical trees in cross linked polyethylene cables with different voltage rating from 66 kV to 500 kV were investigated, under a constant test voltage of 50 Hz/7 kV. It was found that the characteristics of electrical trees in inner layer of 66 kV cable insulation differed greatly from that in outer layer under the same test condition; however, few differences appeared as to 110 kV and above voltage rating cables. Through X-ray diffraction, differential scanning calorimetry and thermogravimetry method, it was suggested that besides extrusion process, molecular weight of base polymer material and its distribution are the prime factors deciding crystallization state, while the crystallization state and impurity content are responsible for the resistivity to electrical trees. Finally, dense and small spherulites, high crystallinity, high purity level of base polymer material and super-clean production processes are the aims to develop higher voltage rating cables.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127183519","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}
引用次数: 1
Remote monitoring of the internal temperature of porcelain and polymer clad high voltage equipment 陶瓷和聚合物包覆高压设备内部温度的远程监测
2008 International Symposium on Electrical Insulating Materials (ISEIM 2008) Pub Date : 2008-10-31 DOI: 10.1109/ISEIM.2008.4664481
K. Abdolall, A. J. Vandermaar
{"title":"Remote monitoring of the internal temperature of porcelain and polymer clad high voltage equipment","authors":"K. Abdolall, A. J. Vandermaar","doi":"10.1109/ISEIM.2008.4664481","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664481","url":null,"abstract":"This paper presents the results of an investigation into the effectiveness of the muWAVE VISION for the detection of internal hot spots in porcelain and polymer clad high voltage devices in the laboratory. The devices consisted of CVTpsilas, surge arresters, and CTpsilas. The results show The muWAVE VISION is effective in the detection of hot spots in CVTpsilas and there is strong correlation between changes in the electrical properties (power factor, partial discharge, and capacitance) and the increase in the apparent temperature at the hot spot location of the device under test as measured by the muWAVE VISION. Its effectiveness for the detection of hot spots in other devices requires more testing of such devices. Initial results are encouraging. The results are discussed in terms of the potential applications of the muWAVE VISION for different kinds of devices.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124306273","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}
引用次数: 1
Considerations on partial discharge of nanocomposite enameled magnet wires for inverter fed random wound motors 变频无绕线电机用纳米复合漆包线局部放电的研究
2008 International Symposium on Electrical Insulating Materials (ISEIM 2008) Pub Date : 2008-10-31 DOI: 10.1109/ISEIM.2008.4664488
Y. Kikuchi, T. Murata, Y. Uozumi, N. Fukumoto, M. Nagata, Y. Wakimoto, T. Yoshimitsu
{"title":"Considerations on partial discharge of nanocomposite enameled magnet wires for inverter fed random wound motors","authors":"Y. Kikuchi, T. Murata, Y. Uozumi, N. Fukumoto, M. Nagata, Y. Wakimoto, T. Yoshimitsu","doi":"10.1109/ISEIM.2008.4664488","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664488","url":null,"abstract":"Nanocomposite enameled wires have been developed for inverter-fed random wound motor windings, however, partial discharge (PD) characteristics is still underlying physics. In this study, effects of environmental conditions on PD characteristics in twisted pairs with conventional and nanocomposite enameled magnet wires were investigated. Measurements of the PD inception voltage (PDIV) and an amount of the PD charge were performed by applying an ac sinusoidal waveform voltage of 60 Hz to the twisted pair. The observed PDIV in this study can be classified into the following three behaviors. First, the PDIV in both wires decreases with increasing relative humidity (RH) at low temperature. Secondly, the PDIV in both wires slightly increases when increasing the RH at high temperature. Thirdly, the PDIV in the conventional enameled wire significantly decreases at 95%RH, while the decrease rate of that in the nanocomposite enameled wire is relatively small. The observed PD phenomena are discussed in terms of material characterization of the enameled wires such as changes in permittivity due to moisture absorption and wettability under voltage application.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123805814","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}
引用次数: 3
Peculiar space charge characteristics in some elastomers 某些弹性体的特殊空间电荷特性
2008 International Symposium on Electrical Insulating Materials (ISEIM 2008) Pub Date : 2008-10-31 DOI: 10.1109/ISEIM.2008.4664535
T. Tanaka, K. Masuya
{"title":"Peculiar space charge characteristics in some elastomers","authors":"T. Tanaka, K. Masuya","doi":"10.1109/ISEIM.2008.4664535","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664535","url":null,"abstract":"Space charge formation processes were investigated on silicone and acrylic elastomers by the pulsed electro-acoustic (PEA) method. Homo charge injection was observed in silicone as anticipated on one hand. Hetero charge injection was unexpectedly observed in acrylic elastomer on the other hand. This peculiar behavior might be related to material composition and additives. Multiple successive hetero charge injection and even homo and hetero charge double injection were observed in the acrylnitrile and acrylic elastomers used. A multiple injection process is interesting to be explored further. Hetero charge injection is an apparent phenomenon that needs more theoretical consideration.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131305630","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}
引用次数: 8
Effects of surface modification of nano-silica on the thermal degradation and combustion Behaviors of LLDPE 纳米二氧化硅表面改性对LLDPE热降解和燃烧行为的影响
2008 International Symposium on Electrical Insulating Materials (ISEIM 2008) Pub Date : 2008-10-31 DOI: 10.1109/ISEIM.2008.4664497
Zhidong Han, Haitao Pan, Limin Dong, Xianyou Zhang
{"title":"Effects of surface modification of nano-silica on the thermal degradation and combustion Behaviors of LLDPE","authors":"Zhidong Han, Haitao Pan, Limin Dong, Xianyou Zhang","doi":"10.1109/ISEIM.2008.4664497","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664497","url":null,"abstract":"In this paper, nano-silica with and without surface modification was used to prepare linear low density polyethylene (LLDPE) /silica composites whose thermal stability and combustion behaviors were investigated by thermal gravimetric analysis (TG) and cone calorimeter (CONE), respectively. As a result of TG, composites with surface modified nano-silica possessed better thermal stability than that with pristine nano-silica. The results of CONE proved better combustion properties of composites with surface modified nano-silica by showing reduced heat release rate (HRR) and mass loss rate (MLR).","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125512697","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}
引用次数: 3
Improving PD source localization techniques in cable systems 改进电缆系统中PD源定位技术
2008 International Symposium on Electrical Insulating Materials (ISEIM 2008) Pub Date : 2008-10-31 DOI: 10.1109/ISEIM.2008.4664446
A. Cavallini, G. Montanari, G. Pasini, A. Salsi
{"title":"Improving PD source localization techniques in cable systems","authors":"A. Cavallini, G. Montanari, G. Pasini, A. Salsi","doi":"10.1109/ISEIM.2008.4664446","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664446","url":null,"abstract":"Partial discharge (PD) testing of cable systems can benefit from the use of time synchronized PD detectors since (a) location and identification of PD phenomena is easier, (b) the logistics are greatly simplified as the voltage reference signal must be provided to one detector only (thus exploiting, e.g., instrument transformers at cable terminals). This paper will show how measurements can be synchronized to the global positioning system and how the information provided by synchronized detectors can be exploited. A practical case of measurements on a HV cable will be presented to show the effectiveness of the time synchronized measurements.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128251205","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}
引用次数: 3
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