2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)最新文献_第8页

Dielectric response and thermal conductivity of nanostructured microcomposites: High Density Polyethylene filled with a mixture of ZnO and HCl doped polyaniline 纳米结构微复合材料的介电响应和导热性能:高密度聚乙烯填充ZnO和HCl掺杂聚苯胺的混合物

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI: 10.1109/ICACACT.2014.7223613

C. Vanga-Bouanga, M. Frechette, É. David

引用次数: 1

Electrospun nanofibers with piezoelectric properties 具有压电特性的电纺丝纳米纤维

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI: 10.1109/ICACACT.2014.7223520

D. Fabiani, M. Zaccaria, A. Zucchelli, J. Belcari, O. Bocchi

引用次数: 2

Dielectric strength of alternative insulation gases at high pressure in the inhomogeneous electric field 非均匀电场高压下替代绝缘气体的介电强度

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI: 10.1109/ICACACT.2014.7223618

Andreas Hopf, M. Rossner, F. Berger, U. Prucker

引用次数: 10

Applying the PD F-factor to verify the integrity of large motor stator insulation design 应用PD f因子验证大型电机定子绝缘设计的完整性

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI: 10.1109/ICACACT.2014.7223553

A. Vouk, G. Stone

引用次数: 0

Oil-pressboard interface charges under combined AC/DC electric field: Their characteristics and influence on surface flashover voltage 交直流复合电场作用下油压板界面电荷特性及其对表面闪络电压的影响

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI: 10.1109/ICACACT.2014.7223483

B. Qi, Yilong Chen, Chengrong Li, C. Gao, Linjie Zhao, Xiaqing Sun

{"title":"Oil-pressboard interface charges under combined AC/DC electric field: Their characteristics and influence on surface flashover voltage","authors":"B. Qi, Yilong Chen, Chengrong Li, C. Gao, Linjie Zhao, Xiaqing Sun","doi":"10.1109/ICACACT.2014.7223483","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223483","url":null,"abstract":"Under AC/DC combined electric field, the oil-pressboard insulation of the converter transformer accumulates space charges to generate a partially distorted non-uniform field and thus affects the electric strength distribution of the insulation system. The present research uses the needle-plate electrode to simulate the distorted non-uniform electric field fostered by the space charges and adopts the electrostatic capacitive probe method to record the changing patterns of the interface charges in the AC/DC combined electric field, and studies the impact of interface charges on flashover voltage, aiming at providing concrete references for the design of converter transformer. The research results indicate that, under AC/DC combined electric field where the ratios between AC voltage equivalent value and the DC voltage are recorded as 1∶1 and 1∶5, the interface charges accumulated at the upper layer of the pressboard in the non-uniform electric field possess the same polarity as that of the DC proportion in the applied voltage complex. The charge density under the combined electric field superimposed by AC on negative DC voltage appears larger than that in the context of the positive DC voltage. The interface charge density increases with the duration of voltage application and also fluctuates with the AC instantaneous field in the similar manner as power frequency voltage. The larger the DC proportion in the combined electric field, the less the fluctuation appears. Due to the reverse effect of the homopolar charges to the electric field, the surface flashover voltage in the combined electric field superimposed by AC voltage on the negative DC voltage is 1.3 times greater than that in the scenario of positive DC voltage.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126756927","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

Interference monitoring during the factory PD tests of ±800kV converter transformer ±800kV换流变压器出厂PD试验干扰监测

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI: 10.1109/ICACACT.2014.7223484

B. Qi, Zongwang Zhu, Hong-xin Ji, Chengrong Li, Linjie Zhao, Ruihai Li

{"title":"Interference monitoring during the factory PD tests of ±800kV converter transformer","authors":"B. Qi, Zongwang Zhu, Hong-xin Ji, Chengrong Li, Linjie Zhao, Ruihai Li","doi":"10.1109/ICACACT.2014.7223484","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223484","url":null,"abstract":"Partial discharge (PD) level under the specified AC/DC test voltages, which is one key parameter indicating the insulation reliability of ultra-high voltage direct current (UHVDC) converter transformers, do not often be accurately determined due to the impact of the external electromagnetic interference. To solve this problem, a method that uses the ultra-high frequency (UHF) technology to monitor the PD interferences was brought forward in this paper, and was applied to the factory tests of a ± 800kV converter transformer. The results show that the waveform characteristic of the UHF detection signals can be well used for recognizing the interferences caused by communication equipment, as well as the phase distribution characteristics of the UHF detection signals for the floating potential discharge and the point discharge induced by various types of AC / DC test voltages. The results also confirm that the floating discharge spots and the point discharge spots can be quickly and accurately located by analyzing the arriving time difference of RF signals at the different sensors of the UHF antenna array. Based on the monitoring results, the PD interference sources were well treated and then the ± 800kV converter transformer smoothly passed the partial discharge measurements. The research results will be further deployed to the similar work of the UHVDC converter transformers in the converter stations.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125725635","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

Simulation of the effect of armor coating conductivity on the stress grading coating performance under PWM multilevel waveforms PWM多电平波形下装甲涂层电导率对应力分级涂层性能影响的仿真研究

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI: 10.1109/ICACACT.2014.7223542

F. Espino-cortes, T. Asiaín-Olivares, P. Gómez

{"title":"Simulation of the effect of armor coating conductivity on the stress grading coating performance under PWM multilevel waveforms","authors":"F. Espino-cortes, T. Asiaín-Olivares, P. Gómez","doi":"10.1109/ICACACT.2014.7223542","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223542","url":null,"abstract":"The high electric field present along the stress grading (SG) coatings in coil ends of medium voltage rotating machines fed by adjustable speed drives (ASD) can lead to surface discharge and an increased resistive heating. Previous works had shown that the analysis of SG coatings for coil ends in motors working with ASD requires consideration of the effect of the conductive armor coating. Usually the design of the conductive armor coating (CAT) and the SG coatings is done separately; however, it is important to understand the combined performance of both coatings, especially under pulse width modulated (PWM) waveforms. With this purpose, transient finite element method (FEM) was used to analyze how changes in the conductivity of the CAT modify the electric field and resistive heat density along both coatings for multilevel PWM waveforms. According with the results, the increment of the CAT conductivity reduces the maximum heat and maximum electric field in the CAT; however, a change in the properties of the SG coating can be required to avoid transferring the problem to this coating, either for three or five levels PWM waveforms.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121197025","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: 10

Dissolved hydrogen measurement with palladium-silver FBG sensor in transformer oil 用钯银光纤光栅传感器测量变压器油中溶解氢

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI: 10.1109/ICACACT.2014.7223605

Hong-Tu Song, G. Ma, Jun Jiang, Cheng-Rong Li, Ying-Ting Luo, Hong-Bin Wang

引用次数: 1

Automated recognition of partial discharge in oil-immersed insulation 油浸绝缘局部放电自动识别

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI: 10.1109/ICACACT.2014.7223599

Hamed Janani, N. Jacob, B. Kordi

引用次数: 7

Influence of environmental factors on hydrophobicity transfer property of silicone rubber material 环境因素对硅橡胶材料疏水转移性能的影响

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI: 10.1109/ICACACT.2014.7223509

Chenglong Zhao, Mingxi Zhu, H. Mei, Li-ming Wang, Z. Guan

{"title":"Influence of environmental factors on hydrophobicity transfer property of silicone rubber material","authors":"Chenglong Zhao, Mingxi Zhu, H. Mei, Li-ming Wang, Z. Guan","doi":"10.1109/ICACACT.2014.7223509","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223509","url":null,"abstract":"Silicone rubber materials have been widely used as external insulation for power systems due to their good hydrophobicity and hydrophobicity transfer. However, pollution flashover accidents of composite insulators occurred from time to time in recent years. The influence of environmental condition on hydrophobicity and hydrophobicity transfer property of silicone rubber material needs further research. In this paper, incubator and saturated salt solution were used respectively to control ambient temperature and humidity precisely. Hydrophobicity measurement method were studied and regulated. Using incubator and special temperature control platform, hydrophobicity transfer property of silicone rubber material in different temperature was deeply studied, and the results were analyzed. The results showed that hydrophobicity transfer speed of silicone rubber slowed down with temperature decreased. Meanwhile, the results showed that ambient humidity had a great influence on hydrophobicity transfer property of silicone rubber. Flashover performance of silicone rubber samples with different hydrophobicity was analyzed. The results showed that the pollution flashover performance of composite insulators is closely related to the hydrophobicity state of the polluted surface.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"15 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131493848","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: 10