2012 International Conference on High Voltage Engineering and Application最新文献

Effects of SiO2 particles on surface charge of epoxy nanocomposites SiO2颗粒对环氧纳米复合材料表面电荷的影响

2012 International Conference on High Voltage Engineering and Application Pub Date : 2013-04-01 DOI: 10.1541/IEEJFMS.133.224

B. Du, Li Wang, J. Zhang, Yong Liu, Y. Gao

{"title":"Effects of SiO2 particles on surface charge of epoxy nanocomposites","authors":"B. Du, Li Wang, J. Zhang, Yong Liu, Y. Gao","doi":"10.1541/IEEJFMS.133.224","DOIUrl":"https://doi.org/10.1541/IEEJFMS.133.224","url":null,"abstract":"Epoxy used as insulating material in electronic and electrical devices plays an important role in system reliability. Addition of nanoparticles into epoxy can improve the insulating properties compared with undoped material. However, due to the change of the material structure, trap characteristics and charge behaviors are altered as a consequence. This possibly leads to a great risk of electric field distortion and discharge that degrades the insulation. From the viewpoint of safety, it is necessary to investigate the charge behavior on epoxy nanocomposites. This paper presents study aimed at clarifying the effect of nano-filler content on surface charge accumulation and decay behaviors of epoxy nanocomposites with SiO2 particles. Samples were prepared by dispersing nano-scale SiO2 into epoxy by mixing with shear force. Corona charging tests were performed at room temperature with a relative humidity of ~ 40%. The charge distribution was measured by means of an electrostatic voltmeter. Obtained results show the dependence of the accumulated charge as well as the charge decay rate upon the concentration of SiO2, varying as a function of the charge polarity, charging time and charging voltage. It is suggested that the charge dynamics is dependent upon the characteristics of localized surface states that are altered by the nanoparticles.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"220 1","pages":"194-198"},"PeriodicalIF":0.0,"publicationDate":"2013-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78484049","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: 4

Gelling behaviour of natural ester transformer liquid under thermal ageing 热老化下天然酯类变压器液的胶凝行为

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI: 10.1109/ICHVE.2012.6357101

W. Lu, Q. Liu, Z. Wang

{"title":"Gelling behaviour of natural ester transformer liquid under thermal ageing","authors":"W. Lu, Q. Liu, Z. Wang","doi":"10.1109/ICHVE.2012.6357101","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357101","url":null,"abstract":"There have been increasing interests on natural esters as potential substitutes to conventional mineral oils in transformers, due to their less-flammable, non-toxic and environmentally friendly properties. The application has been successful in traction and distribution transformers with sealed type. But the susceptibility to oxidation and hence the suspected gelling behaviour prevent the application of natural esters in free-breathing transformers. This paper presents an experimental study of gelling/oxidation behaviour of thin films of a natural ester under thermal ageing. Ageing experiments were carried out with presence of air at different temperatures of 120 °C and 20 °C and durations up to 2 years. The gelling/oxidation behaviour of natural ester was evaluated in terms of changes in viscosity and acidity. Results showed that both viscosity and acidity can be used to assess gelling/oxidation behaviour of natural ester from initial liquid phase to eventually gelled form. In addition to temperature, the thickness of the thin film samples has a significant effect on the gelling speed, i.e. the thinner of the film, the faster of the gelling speed.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"110 1","pages":"643-647"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85768227","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

Scale model experiment for the study of lightning-induced spark discharge on large floating roof oil tanks 大型浮顶油罐雷电致火花放电的比例模型试验研究

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI: 10.1109/ICHVE.2012.6357009

Baoquan Liu, A. Jiang, Z. Fu

引用次数: 3

Power transformer testing at Manitoba Hydro's high voltage test facility 曼尼托巴水电公司高压测试设施的电力变压器测试

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI: 10.1109/ICHVE.2012.6357061

W. McDermid, J. Lambert

引用次数: 4

A study of failure of pole mounted distribution transformers 杆状配电变压器故障的研究

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI: 10.1109/ICHVE.2012.6357062

A. Al-arainy, N. Malik, M. Qureshi

引用次数: 4

Calibration of field-mill instrument for measuring DC electric field 直流电场测量场磨仪的标定

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI: 10.1109/ICHVE.2012.6357031

Bo Zhang, Wenzhuo Wang, Jinliang He, R. Zeng, H. Yin

引用次数: 4

Mathematical description of acoustic emission signals generated by partial discharges 局部放电产生声发射信号的数学描述

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI: 10.1109/ICHVE.2012.6357051

D. Wotzka

引用次数: 9

Investigation of a cycloaliphatic epoxy resin system considering Al2O3 and TiO2 nanofillers 含Al2O3和TiO2纳米填料的环脂肪族环氧树脂体系的研究

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI: 10.1109/ICHVE.2012.6357072

M. M. S. Shirazi, H. Borsi, E. Gockenbach

{"title":"Investigation of a cycloaliphatic epoxy resin system considering Al2O3 and TiO2 nanofillers","authors":"M. M. S. Shirazi, H. Borsi, E. Gockenbach","doi":"10.1109/ICHVE.2012.6357072","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357072","url":null,"abstract":"Inorganic nanofillers combined with organic polymers have been used for several years in order to enhance the electrical and dielectric properties of insulation materials. The advantages of using nanofillers can be explained by very large interface area of them in comparison with microfillers. To evaluate the influence of Al2O3and also γ-TiO2nanofillers separately on a cycloaliphatic epoxy resin system as an outdoor insulation system, specific DC volume resistivity, loss factor and permittivity were investigated. In this regard, several specimens with 2 mm thickness were produced containing 0%, 1%, 3%, 5% and 7% per weight under especial condition to have the most possible homogeneous distribution of nanofillers. Then the behavior of the mentioned parameters was investigated from 23 °C up to 170 °C at different frequencies. According to the results, DC volume resistivity of the specimens with Al2O3 shows higher resistance between 80 °C and 140 °C than the specimens without nanofiller. Adding TiO2 does not cause considerable changes in volume resistivity. Loss factor has no significant change up to glass transition temperature (Tg), but it reduces at the temperatures above Tg, when Al2O3 or TiO2 was added. Relative permittivity of the specimens containing Al2O3 and TiO2 were increased up to 110 °C. After this temperature, relative permittivity of all nanocomposites decreases in comparison to 0 wt. %.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"2010 1","pages":"186-189"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86285157","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

Frequency-dependence of conductivity of new mineral oil studied by dielectric spectroscopy 电介质谱法研究新型矿物油电导率的频率依赖性

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI: 10.1109/ICHVE.2012.6357099

Yuan Zhou, M. Hao, G. Chen, G. Wilson, P. Jarman

{"title":"Frequency-dependence of conductivity of new mineral oil studied by dielectric spectroscopy","authors":"Yuan Zhou, M. Hao, G. Chen, G. Wilson, P. Jarman","doi":"10.1109/ICHVE.2012.6357099","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357099","url":null,"abstract":"Mineral oil has been widely used in power transformers and understanding the mechanism of the conduction process in mineral oil is important as it reflects the status of oil conditions. Dielectric spectroscopy, as a non-destructive measurement, has been employed for analyzing dielectric properties of material for many years. This paper presents findings from the study on new transformer oil by a frequency domain method. It has been found that the conductivity of the oil calculated from dielectric response in the low frequency range (100Hz~0.001Hz) comprises three stages: two steady states joined by a transient process. Both the distance between the two electrodes of the testing cell and the temperature of oil influence the starting frequency of the transient process. The oil model used to analyze the DC conductivity of oil has been applied to simulate the frequency-dependence conductivity curve and a new factor has been introduced into the model to improve its accuracy. According to this model, the mobility of charge carriers increases with temperature significantly, whilst density of initial charge carriers only increases slightly, indicating the crucial factor that influences the conductivity is the viscosity of the oil.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"151 1","pages":"634-637"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86363742","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

Over-voltage online monitoring system based on the impulse full current of arrester 基于避雷器冲击满流的过电压在线监测系统

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI: 10.1109/ICHVE.2012.6357136

Sen Wang, Bo Niu, Jie Guo, Panfeng Hu, Zhizhong Li, Xiaoming Zhu

引用次数: 0