2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena最新文献_第5页

Hydrophobicity evaluation of polymer insulator based on surface discharge characteristics 基于表面放电特性的聚合物绝缘子疏水性评价

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232681

B. Du, X. X. Cheng, Z. L. Ma, K. Wu

{"title":"Hydrophobicity evaluation of polymer insulator based on surface discharge characteristics","authors":"B. Du, X. X. Cheng, Z. L. Ma, K. Wu","doi":"10.1109/CEIDP.2011.6232681","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232681","url":null,"abstract":"The hydrophobicity evaluation for polymer insulators continues to be a prominent characteristic. For the purpose of evaluating the hydrophobicity of polymer insulator, a VHF antenna was utilized to receive high frequency electromagnetic signals, which were induced during the surface discharge on the sample surface. The wavelet theory was applied to analyze the electromagnetic signals that were processed by signal-processing system. The obtained 3-D images of surface discharge, which contains the frequency, the time and the amplitude, can figure out the hydrophobicity of polymer insulator with different ageing time efficiently. Based on 3-D images, 2-D contour line spectra were set up for investigating the complexity of discharge. The fractal dimensions of 2-D spectra and lacunarity were computed to assess the severity of surface discharge quantificationally. It is found that the series of methods using PD-induced electromagnetic wave can efficiently recognize the characteristics the discharge on the surface of insulators, which can be utilized to evaluate the hydrophobicity of polymer insulators.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"15 1","pages":"407-410"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87784658","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

Enhancements of epoxy resin based syntactic foam by inner interface and matrix modifications 内界面和基体改性增强环氧树脂基复合泡沫

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232736

A. Strauchs, A. Schnettler

引用次数: 5

Pressure and temperature effects on the paschen curve 压力和温度对paschen曲线的影响

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232695

E. Sili, F. Koliatene, J. Cambronne

{"title":"Pressure and temperature effects on the paschen curve","authors":"E. Sili, F. Koliatene, J. Cambronne","doi":"10.1109/CEIDP.2011.6232695","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232695","url":null,"abstract":"In aircraft applications according to the nature of electrical equipment, its location may be in unpressurized area; thus the environment conditions may change from atmospheric pressure to less than 100 mbar, and the temperature may vary up to 180°C near the aircraft engine. Since all these parameters may affect the discharge ignition voltage, the classical paschen curve has to be replotted according to these parameters. In this paper we firstly investigated the domain of validity of two corrective expressions on the paschen's law found in the literature, in case of changing the air environment: Peek and Dunbar corrections. After that, the effect of the low pressure combined to high temperature on the breakdown voltage at the left of the Paschen minimum has been investigated. Results show two different behaviours of Paschen curve related to temperature and pressure that can be explained by the variation of the breakdown mechanisms, and supported by measuring the energy dissipated in the electric discharge by means of the Lissajous figures at different conditions. Consequently, it was demonstrated that the electrical breakdown in gases occurs due to the gas or vacuum mechanism managed by the temperature and/or the pressure.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"13 1","pages":"464-467"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85878839","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: 23

Morphologic analysis and diagnosis of defects inside cast resin medium voltage current transformers insulation by digital partial discharges acquisitions 用数字局部放电采集技术对铸造树脂中压电流互感器绝缘内部缺陷进行形态学分析与诊断

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232702

F. Guastavino, E. Torello, S. Squarcia, A. Dardano, M. Secci, F. Ferraro, D. Pistone

引用次数: 1

Accelerated testing of outdoor power equipment 户外动力设备加速试验

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232675

A. Krivda, B. Singh, M. Carlen, T. Hartmann, S. Schaal, P. Mahonen, H. Le, S. Tzavalas

引用次数: 2

Material erosion and build-up at the high voltage electrode during PD testing of subsea insulation materials using a modified Cigré II test method 使用改进的cigr<e:1> II测试方法对海底绝缘材料进行PD测试时，高压电极处的材料腐蚀和堆积

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232691

O. Kvien, G. Berg, S. Hvidsten

{"title":"Material erosion and build-up at the high voltage electrode during PD testing of subsea insulation materials using a modified Cigré II test method","authors":"O. Kvien, G. Berg, S. Hvidsten","doi":"10.1109/CEIDP.2011.6232691","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232691","url":null,"abstract":"The main aim of this work has been to test the long term durability of insulation materials subjected to surface partial discharges (PD), as a part of a larger study on the performance of materials used in subsea high voltage apparatus. Electrical equipment used in subsea installations are subjected to high hydrostatic pressures and seawater, often combined with high temperatures and even reactive chemical environments, making new challenges for the materials involved. The test method used for PD-testing is based on the Cigré II method. The method has been used in dry and humid conditions to identify the effect of humidity on the degradation of insulation materials subjected to PD relevant for subsea applications. The insulation materials samples were 2 millimeter thick disks of POM (polyoxymethylene) and XLPE (cross-linked homo-polymer polyethylene). The samples where subjected to surface discharges in a 1 mm sphere-to-plane electrode gap. The results show that the humidity during testing had a significant impact on material erosion and material transport in the electrode gap. POM was more rapidly degraded by PD than XLPE.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"87 1","pages":"448-451"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78959336","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

Measurement and modelling of the DC dielectric strength of pure, nanofilled and microfilled polyetherimide resin 纯、纳米填充和微填充聚醚酰亚胺树脂直流介电强度的测量和建模

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232761

D. Mary, D. Malec, M. Q. Nguyen, P. Werynski, B. Gornicka

引用次数: 0

Pre-breakdown current in long point-plane transformer oil gaps with insulating barrier under AC voltage 交流电压下带绝缘屏障的长点平面变压器油隙预击穿电流

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232763

F. Guerbas, A. Boubakeur, A. Beroual

引用次数: 1

Time evolution of the activation energy and volumes in electrical aging and wave packets in PE 电老化和波包中活化能和体积的时间演化

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232604

J. Crine

{"title":"Time evolution of the activation energy and volumes in electrical aging and wave packets in PE","authors":"J. Crine","doi":"10.1109/CEIDP.2011.6232604","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232604","url":null,"abstract":"In the proposed model, one broken C-C bond is surrounded by a volume ΔV of stressed molecules and by a volume δv of strained molecules. These volumes could be depicted as the volumes in which the deformed molecules relax following the disturbance associated with the bond breaking. Both parameters are decreasing exponentially with time under constant field application. However, the time scales for the bonds breaking and for the molecular relaxations are not the same. When the energy barrier is calculated as a function of time for different fields and sample size, it appears that it is oscillating with time. Interestingly, the frequency of the oscillations is identical to the oscillations of wave packets observed in space charge measurements under the same experimental conditions. The influence of all contributing parameters is discussed and it is concluded that oscillations exist under all fields above the critical (threshold) field but at low fields, the time of appearance of the first one could be so long that it has never been recorded. The significance and implications of this phenomenon are briefly discussed.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"36 1","pages":"93-96"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91383955","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

Behavior of ions in electric double layer 双电层中离子的行为

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232781

Y. Fujii, Y. Muramoto, N. Shimizu

引用次数: 2