2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)最新文献_第6页

Numerical calculation of current through grading electrodes in inner cooling circuit of HV converter valve 高压换流阀内冷却回路分级电极电流的数值计算

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI: 10.1109/CEIDP.2015.7352010

Xianrong Wang, Xuezhong Liu, Chenxing Wang, Ning Liu, Xiuying Jiao, Lei Liu

{"title":"Numerical calculation of current through grading electrodes in inner cooling circuit of HV converter valve","authors":"Xianrong Wang, Xuezhong Liu, Chenxing Wang, Ning Liu, Xiuying Jiao, Lei Liu","doi":"10.1109/CEIDP.2015.7352010","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352010","url":null,"abstract":"Inorganic sediments deposited on the pin-type grading electrodes in the inner cooling water circuits would affect the normal operation of high voltage (HV) converter valves, which may be caused by the current through the grading electrodes. The distributions of the current through the electrodes in two different converter valves are calculated using the finite element method (FEM) software in this paper. The relationship between the thickness of the sediment on the grading electrodes and the DC current through the electrodes is analyzed. The distributions of current density on the electrodes are compared with the morphology of deposited sediments on the corresponding electrodes. The leakage current through the aluminum radiators from the distributed water circuit is calculated. The results indicate that the sediment deposition is mainly caused by the DC current through the pin-type grading electrode. The sediment thickness has a positive correlation with the magnitude of the DC current. The leakage current through the radiators from distributed water circuit may cause electrochemical corrosion which could generate the source of the sediments.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115099296","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: 7

Acoustic partial discharge signal denoising using power spectral subtraction 基于功率谱减法的声学局部放电信号去噪

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI: 10.1109/CEIDP.2015.7352003

R. Hussein, K. Shaban, A. El-Hag

引用次数: 2

Silicone rubber with improved hydrophobicity 改善了疏水性的硅橡胶

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI: 10.1109/CEIDP.2015.7352048

Hongjie Sun, Yang Wang, Jiansheng Chen, H. Hillborg

{"title":"Silicone rubber with improved hydrophobicity","authors":"Hongjie Sun, Yang Wang, Jiansheng Chen, H. Hillborg","doi":"10.1109/CEIDP.2015.7352048","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352048","url":null,"abstract":"In outdoor insulation, a hydrophobic surface is crucial for minimizing leakage currents during severe weather conditions and in polluted environments. Silicone rubber is a commonly used insulation material with good hydrophobicity. However, the hydrophobicity may be temporarily reduced or even lost when silicone rubber worked under extreme pollution events, but will gradually recover with time. The current work is aiming at developing a silicone rubber formulation with improved hydrophobicity, such as increased hydrophobic recovery rate. This was achieved by adding silicone-based additives. The loss and recovery of hydrophobicity of the materials after exposure to corona discharges, as well as the hydrophobic transfer ability, were assessed by contact angle measurements. In addition, an inclined plane tracking test was carried out according to IEC 60587. The modified silicone rubber exhibited a more durable hydrophobicity during corona treatment and a faster recovery after end of exposure. The resistance to tracking and erosion behavior was maintained, compared to the reference materials. Unexpectedly, no improvement on the hydrophobicity transfer performance was noted.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116535058","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: 5

Partial discharge energy and electrical tree volume degraded in epoxy resin 局部放电能量和电树体积在环氧树脂中降解

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI: 10.1109/CEIDP.2015.7352053

R. Schurch, S. Rowland, R. Bradley

引用次数: 19

Influence of internal discharges in a cavity within polymeric insulating material caused by partial discharge mechanisms 局部放电机制对聚合物绝缘材料内腔内放电的影响

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI: 10.1109/CEIDP.2015.7352031

T. Tanmaneeprasert, P. Lewin, J. Hunter

引用次数: 6

Dielectric response of HDPE/clay nanocomposites containing 10%wt of organo-modified clay 含10%有机改性粘土的HDPE/粘土纳米复合材料的介电响应

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI: 10.1109/CEIDP.2015.7352149

É. David, B. Zazoum, M. Frechette, F. Rogti

引用次数: 4

DC breakdown strength of epoxy-boron nitride nanocomposites: Trend and reproducibility 环氧-氮化硼纳米复合材料的直流击穿强度:趋势和再现性

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI: 10.1109/CEIDP.2015.7352014

I. Tsekmes, R. Kochetov, P. Morshuis, J. Smit

引用次数: 10

Breakdown voltage prediction of SF6 gaps based on electric field features and SVM algorithm 基于电场特征和SVM算法的SF6间隙击穿电压预测

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI: 10.1109/CEIDP.2015.7351992

Zhibin Qiu, J. Ruan, Daochun Huang, M. Wei, Congpeng Huang, Shengwen Shu

{"title":"Breakdown voltage prediction of SF6 gaps based on electric field features and SVM algorithm","authors":"Zhibin Qiu, J. Ruan, Daochun Huang, M. Wei, Congpeng Huang, Shengwen Shu","doi":"10.1109/CEIDP.2015.7351992","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7351992","url":null,"abstract":"The breakdown voltages of SF6 gaps in uniform field and non-uniform field are predicted by a new method based on the electric field features and support vector machine (SVM). The finite element method (FEM) is used to calculate the electric field distribution of the SF6 gap. The parameters including the electric field strength, electric field energy, energy density, electric field gradient and scale parameters are used to characterize the electric field distribution of SF6 gaps. The breakdown voltage prediction model is established by SVM, the electric field features and the gas pressure are taken as the input to the SVM model. The output is whether the gap will breakdown under a given applied voltage and a certain gas pressure. Several experimental values of breakdown voltage are set as training samples and the corresponding electric field features are applied to train the SVM model. The improved grid search method is used to search optimal parameters including the penalty coefficient and kernel function parameter. The proposed method is applied to predict the breakdown voltages of coaxial cylinder gaps and rod-plane gaps in SF6. The predicted results coincide with the experimental values very well.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122234442","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: 2

RTV pre-coated cap-and-pin toughened glass insulators - a wide experience in the Italian overhead transmission system RTV预涂帽销钢化玻璃绝缘子-在意大利架空输电系统中拥有丰富的经验

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI: 10.1109/CEIDP.2015.7351986

M. Marzinotto, E. Cherney, G. Mazzanti

引用次数: 9

Performance of liquid silicone rubber exposed to acid fog under DC stress 直流应力下酸雾作用下液态硅橡胶的性能

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI: 10.1109/CEIDP.2015.7352039

Hongjie Sun, D. Meng, Boveri-Yibo Zhang, Fumei Wu, Jiansheng Chen, H. Hillborg

{"title":"Performance of liquid silicone rubber exposed to acid fog under DC stress","authors":"Hongjie Sun, D. Meng, Boveri-Yibo Zhang, Fumei Wu, Jiansheng Chen, H. Hillborg","doi":"10.1109/CEIDP.2015.7352039","DOIUrl":"https://doi.org/10.1109/CEIDP.2015.7352039","url":null,"abstract":"With excellent electrical properties high performance under wet and polluted conditions, wide operation temperature range and simple processing, liquid silicone rubber have been extensively used as an insulating material in power transmission and distribution system. However, in recent years, `acidic attack' is becoming a matter of concern to the reliability of silicone rubber outdoor insulation. There are indications that the root cause for the cracking or hydrophobicity loss on some silicone rubber outdoor insulation is a combination factor of electrical (corona), environmental (UV, acid rain), mechanical stresses and other effects. In order to further understand the effect factors, a new lab-scale chamber with combined acidic attack and electrical stress has been constructed. In this paper, the performance of two types of liquid silicone rubber, energized with DC 1.85 kV voltage (corresponding to a specific creepage distance of 43 mm/kV), has been tested under a 1000 h acid fog test. The leakage currents along the surfaces were continuously monitored during the 1000 h test. The hydrophobicity, surface morphology (by SEM), infrared spectroscopy and hardness of the virgin samples and samples aged after 250 h, 500 h, 750 h, and 1000 h have been evaluated. The experimental results indicated that two types of LSR rubber maintained their hydrophobic surface properties, which was also in agreement with the low leakage currents level throughout the test. For all the samples, the infrared spectra were almost unchanged during the whole 1000 h acid fog test, but the hardness increased around 20%. Moreover all the initial (before ageing) and 1000h-aged samples passed AC4.5 kV tracking and erosion tests. It was seen that LSR rubber present good performance in the acid fog environment under DC stress, no obviously indication of `acidic attack' has been observed.","PeriodicalId":432404,"journal":{"name":"2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123764886","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