Proceedings of 2011 International Symposium on Electrical Insulating Materials最新文献_第8页

Influence of structural change by water-tree degradation on electrical-tree inception voltage 水树降解引起的结构变化对电树起始电压的影响

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI: 10.1109/ISEIM.2011.6826274

Takanori Yamaguchi, T. Kato, Y. Suzuoki, F. Komori, T. Tsuji, H. Mashima

{"title":"Influence of structural change by water-tree degradation on electrical-tree inception voltage","authors":"Takanori Yamaguchi, T. Kato, Y. Suzuoki, F. Komori, T. Tsuji, H. Mashima","doi":"10.1109/ISEIM.2011.6826274","DOIUrl":"https://doi.org/10.1109/ISEIM.2011.6826274","url":null,"abstract":"To improve accuracy of degradation diagnosis for CV power cables, it is important to clarify the mechanism of inception and propagation of electrical-tree from water-tree degradation. In our previous work, ac-electrical-tree inception voltage was measured at 303 K for the samples with water tree formed mainly at 363 K. As a result, the samples with water tree, in spite of the existence of water tree degradation, showed higher ac-electrical-tree inception voltage than those without water tree. This was attributed to electrical field relaxation. To study the effect of change in material structure itself, it is necessary to reduce the field relaxation effect. In the present work, therefore, we used the samples with dried water tree and applied impulse voltages, and discussed the effect of structural change due to water tree degradation. As a result, the impulse-tree inception voltage in the samples with dried water tree was lower than those with water tree but was slightly higher than those without water tree. In the sample with dried water tree, decrease in water molecule density which is considered to restrain the electron may lead to the lower impulse-tree inception voltage. However, the remaining degradation products and structural change may lead to the slightly higher impulse-tree inception voltage than those without water tree. The effect of prolonged ac voltage application prior to impulse voltage was also studied to discuss the effect of water tree degradation on long term deterioration of cable performance.","PeriodicalId":360527,"journal":{"name":"Proceedings of 2011 International Symposium on Electrical Insulating Materials","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125148224","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: 6

Dependence of space charge formation in polyimide film on applied voltage wave form 聚酰亚胺薄膜中空间电荷形成与外加电压波形的关系

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI: 10.1109/ISEIM.2011.6826287

T. Ishii, S. Kikuchi, H. Miyake, Y. Tanaka, T. Takada

{"title":"Dependence of space charge formation in polyimide film on applied voltage wave form","authors":"T. Ishii, S. Kikuchi, H. Miyake, Y. Tanaka, T. Takada","doi":"10.1109/ISEIM.2011.6826287","DOIUrl":"https://doi.org/10.1109/ISEIM.2011.6826287","url":null,"abstract":"It is found in our previous work that hetero space charges always observed before breakdown occurs in polyimide film under high DC electric field. We have also found that the time-to-breakdown and the accumulated amount of hetero space charges depend on the applied DC electric field. In this report, we have investigated whether the time-to-breakdown and the space charge accumulation depend on the applied voltage wave form or not. By measuring the space charge accumulation using PEA method, it is found that the very close space charge behavior in polyimide film is observed under rectangular voltage application to that observed under DC voltage application. Under high DC electric field, homo charges accumulate at first and they decrease. Following the decrease of homo space charges, the hetero charges appear near electrodes and finally the breakdown occurs. Such process to breakdown was also observed under the application of rectangular voltage wave form. Net voltage application time in rectangular voltage is sometimes close to the time-to-breakdown under DC electric field. However, the time-to-breakdown seems to strongly depend on the humidity of the experimental condition.","PeriodicalId":360527,"journal":{"name":"Proceedings of 2011 International Symposium on Electrical Insulating Materials","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128214196","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

Mechanism and properties of piezoresistive in rubber-matrix nanocomposites 橡胶基纳米复合材料的压阻机理与性能

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI: 10.1109/ISEIM.2011.6826324

Z. Dang, J. Zha, Khurram Shehzad, J. Zhang

{"title":"Mechanism and properties of piezoresistive in rubber-matrix nanocomposites","authors":"Z. Dang, J. Zha, Khurram Shehzad, J. Zhang","doi":"10.1109/ISEIM.2011.6826324","DOIUrl":"https://doi.org/10.1109/ISEIM.2011.6826324","url":null,"abstract":"Advanced materials with excellent piezoresistance sensitivity are attracting more attention due that they can be used as functional materials in pressure sensors. For the researched piezoresistance nanocomposites, we employ canbon nanotubes (CNT) with difference aspect ratios as conducting functional fillers and two kinds of polymers (silicone rubber and thermoplastic elastomer) as polymer matrix, which can produce a great strain at low stress so that finally the nancomposites show outstanding piezoresistance sensitivity. Different to the carbon black (CB)/polymer composites, the CNT/polymer nanocomposites display a positive piezoresistance effect (PPRE), namely the resistance of nanocomposites increases with an increase in pressure stress. Therefore, the mechanism of PPRE is studied in this work by employing the insulating SiO2 nanoparticles and the electrical conducting CB particles as the second kind of fillers. In addition, the effect of aspect ratio (AR) of CNT on piezoresistivity was explored. A correlation between AR of MWNCNT and piezoresistivity of the corresponding composites was established.","PeriodicalId":360527,"journal":{"name":"Proceedings of 2011 International Symposium on Electrical Insulating Materials","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131479802","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

Study on time lag of void discharge in epoxy resin by considering attenuation of X-ray irradiation dose 考虑x射线辐照剂量衰减的环氧树脂空隙放电时滞研究

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI: 10.1109/ISEIM.2011.6826355

Masayuki Hayashi, H. Takada, M. Kozako, M. Hikita, S. Nakamura, T. Umemura, M. Higashiyama

引用次数: 7

Dielectric properites of Al-doped CaCu3Ti4O12 ceramics by coprecipitation method 共沉淀法制备掺铝cuu3ti4o12陶瓷的介电性能

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI: 10.1109/ISEIM.2011.6826267

Li Shengtao, W. Hui, Lin Chun-jiang, Yang Yang, Li Jianying

引用次数: 6

Space charge injection in LDPE by semi-conductive electrode with different carbon black filling rates 不同炭黑填充率的半导电电极在LDPE中的空间电荷注入

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI: 10.1109/ISEIM.2011.6826264

F. Niu, Yewen Zhang, Z. An, F. Zheng, Peng Ma, Q. Lei

引用次数: 12

Effect of defect size on PD pulse characteristics measured with high frequency current transformer in XLPE insulation 缺陷尺寸对XLPE绝缘高频电流互感器测量PD脉冲特性的影响

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI: 10.1109/ISEIM.2011.6826377

Y. Gao, B. Du, T. Han

引用次数: 0

Influence of space charge under non-uniform electric field to electrical treeing in epoxy resin 非均匀电场作用下空间电荷对环氧树脂电树的影响

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI: 10.1109/ISEIM.2011.6826302

M. Fujii, Hiroyuki Shimose, M. Fukuma, T. Takao, M. Nagao

引用次数: 3

Effect of nanoparticles loading on electrical tree propagation in polymer nanocomposites 纳米粒子负载对聚合物纳米复合材料中电树传播的影响

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI: 10.1109/ISEIM.2011.6826263

D. Pitsa, G. Vardakis, M. Danikas

引用次数: 5

Damage effect of typical electronic device under EMP 典型电子器件在电磁脉冲作用下的损伤效应

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI: 10.1109/ISEIM.2011.6826320

Yonghong Cheng, M. Ding, Kai Wu, Yajie Wang, Debo Zhou, Hui Ding, Le Yang

引用次数: 3