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2016 IEEE International Conference on Dielectrics (ICD)最新文献

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Investigation of void erosion on partial discharge activity using simulation 孔隙侵蚀对局部放电活动的模拟研究
Pub Date : 2016-07-03 DOI: 10.1109/ICD.2016.7547762
G. Callender, P. Rapisarda, P. Lewin
Models of partial discharge (PD) activity have been widely used to investigate PD activity in cylindrical and spherical voids within insulation material. PD activity is known to alter void geometry due to the erosion of insulation material from the deployed charge. In this work, a PD model is produced to investigate the impact of void erosion on PD activity. The model is validated by reproducing measured phase resolved PD (PRPD) patterns for a spherical void in a homogeneous dielectric material. The impact of void erosion is then investigated by running the model with different void geometries. The results from the model show that the PRPD patterns depend heavily on the level of erosion due to the impact of the erosion on the electric field at the void surface.
局部放电(PD)活度模型被广泛用于研究绝缘材料圆柱形和球形空隙中的局部放电活度。众所周知,由于部署的电荷对绝缘材料的侵蚀,PD活动会改变空隙的几何形状。在这项工作中,建立了一个PD模型来研究空隙侵蚀对PD活性的影响。通过再现均匀介质中球形空洞的相分辨PD (PRPD)模式,验证了该模型的有效性。然后通过运行不同孔洞几何形状的模型来研究孔洞侵蚀的影响。模型结果表明,由于侵蚀对空洞表面电场的影响,PRPD模式在很大程度上取决于侵蚀程度。
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引用次数: 5
Thermally stimulated depolarization processes in zirconia toughened alumina ceramics 氧化锆增韧氧化铝陶瓷的热激退极化过程
Pub Date : 2016-07-03 DOI: 10.1109/ICD.2016.7547813
Peng Zhang, Jianying Li, H. Jin, Hao Zhang
In this paper, the zirconia toughened alumina (ZTA) ceramics were fabricated by pressureless sintering method. Dielectric relaxation characteristics of both alumina and ZTA ceramics were investigated using thermally stimulated depolarization current (TSDC) method and the relaxation parameters were calculated from the experimental TSDC curves. In addition, the relationship between zirconia doping and dielectric relaxation properties was analyzed. The results showed that doping of zirconia can affect the defect dipoles distributions in ZTA ceramics, and introduces a new relaxation peak at 478K. This new relaxation process may be attributed to the reorientation of dipoles of dopant and oxygen vacancy pairs generated in cubic zirconia grains.
本文采用无压烧结法制备了氧化锆增韧氧化铝(ZTA)陶瓷。采用热激去极化电流(TSDC)法研究了氧化铝和ZTA陶瓷的介电弛豫特性,并根据实验TSDC曲线计算了弛豫参数。此外,还分析了氧化锆掺杂与介质弛豫性能的关系。结果表明,氧化锆的掺杂影响了ZTA陶瓷中缺陷偶极子的分布,并在478K处引入了新的弛豫峰。这种新的弛豫过程可能归因于在立方氧化锆颗粒中产生的掺杂物偶极子和氧空位对的重定向。
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引用次数: 2
A comparison between PSA plots of partial discharges in needle voids and electrical trees 针孔部分放电与电树的PSA图比较
Pub Date : 2016-07-03 DOI: 10.1109/ICD.2016.7547646
N. Chalashkanov, S. Dodd, L. Dissado, J. Fothergill
The aim of this study was to investigate the difference in the pulse sequence analysis (PSA) plots of partial discharge (PD) data obtained from electrode-bound voids and electrical trees in epoxy resin samples. Electrical discharge tests were performed on a set of epoxy resin samples containing needle voids, which were obtained by a partial extraction of tungsten needle electrode. Two epoxy resin systems were used in this study, Araldite CY1301 and Araldite CY1311. The two resins have different dielectric properties, which allowed the effect of material conductivity on the discharge activity in the void to be investigated. Complementary electrical tree growth experiments were performed on a set of samples with a conventional needle-plane electrode configuration. The effects of the material properties, temperature and moisture absorbed in the dielectric samples were also investigated. The results show that additional material characterization is needed to supplement the PSA plots in order to achieve a reliable diagnostic tool.
本研究的目的是研究环氧树脂样品中电极结合空洞和电树获得的局部放电(PD)数据的脉冲序列分析(PSA)图的差异。对一组含针孔的环氧树脂样品进行了放电试验,该样品是通过部分提取钨针电极获得的。本研究使用了两种环氧树脂体系:Araldite CY1301和Araldite CY1311。这两种树脂具有不同的介电性能,从而可以研究材料电导率对空隙放电活性的影响。互补电树生长实验进行了一组样品与传统的针平面电极配置。研究了材料性能、温度和介质样品吸湿率的影响。结果表明,为了实现可靠的诊断工具,需要额外的材料表征来补充PSA图。
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引用次数: 6
Particle chain formation in a liquid polymer under ac electric field: Model and experiments 交流电场作用下液体聚合物中颗粒链的形成:模型与实验
Pub Date : 2016-07-03 DOI: 10.1109/ICD.2016.7547605
G. Bélijar, S. Diaham, L. Laudebat, Z. Valdez-Nava, T. Lebey, T. Jones
This study treats the influence upon the bulk dielectric properties of epoxy resin loaded with barium titanate (BaTiO3) particles when an ac electric field is used to form the particles into chains. A particle chain formation model, coupled with finite element method (FEM) solution of the Laplace's equation leads to estimates for permittivity as a function of the composite structure. Simulation results are then compared with experimental measurements that corroborate the time-dependent evolution of the dielectric permittivity.
本研究研究了在交流电场作用下钛酸钡(BaTiO3)颗粒形成链状时,对负载钛酸钡(BaTiO3)颗粒的环氧树脂体介电性能的影响。粒子链形成模型与拉普拉斯方程的有限元解法相结合,可以估计出介电常数作为复合材料结构的函数。然后将模拟结果与实验测量结果进行比较,证实了介电常数随时间的变化。
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引用次数: 1
A novel concept for electronic transport in nanoscale spaces formed by islandic multi-cored nanoparticles 岛状多核纳米粒子形成的纳米尺度空间中电子输运的新概念
Pub Date : 2016-07-03 DOI: 10.1109/ICD.2016.7547533
T. Tanaka
A nanocomposite system consists of nanoscale organic polymer spaces and islandic inorganic nano-particles. In this paper, a concept of quantum dots (QDs) is introduced to explain various dielectric properties of nanocomposites. Nano-particles are regarded as QDs rather than simple carrier traps. QDs exhibit negative permittivity. They also show Coulomb blockade effect, and inversely accept charge injection if they are subjected to high electric field beyond its barrier threshold. This concept can interpret key phenomena appearing in nanocomposites such as the reduction of permittivity, the threshold of space charge formation, the high field conduction and dielectric breakdown. Space charge formation and treeing phenomena are analyzed in more detail. A threshold for charge injection to QDs are obtained as the order of 100 kV/mm from the experimental data associated with both space charge and treeing.
纳米复合体系由纳米级有机聚合物空间和岛状无机纳米粒子组成。本文引入量子点的概念来解释纳米复合材料的各种介电性能。纳米粒子被认为是量子点,而不是简单的载流子陷阱。量子点呈现负介电常数。它们还表现出库仑阻滞效应,当受到超过势垒阈值的高电场作用时,它们会反向接受电荷注入。这一概念可以解释纳米复合材料中出现的介电常数降低、空间电荷形成阈值、高场传导和介电击穿等关键现象。更详细地分析了空间电荷的形成和树形现象。根据空间电荷和树的实验数据,得到了量子点的电荷注入阈值为100 kV/mm。
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引用次数: 11
Observation of electrical treeing in epoxy resin by X-ray phase contrast imaging 用x射线相衬成像观察环氧树脂中的电树
Pub Date : 2016-07-03 DOI: 10.1109/ICD.2016.7547726
Takahiro Nakamura, K. Ozawa, A. Kumada, K. Hidaka, T. Kato, T. Yamagiwa
Epoxy resins are widely used as insulating material in electrical apparatus. As such epoxy resins are non-transparent due to the effect of fillers, it is hard to optically observe electrical treeing in them. In this paper, we observe electrical trees in unfilled and filled epoxy resins by X-ray phase contrast imaging. When X-ray passes through very small tubular material such as electrical trees, edge-enhancement images are obtained. It makes easier to detect trees, but, on the other hand, wave-optical analysis is necessary to obtain a tree diameter accurately from an apparent tree diameter in an X-ray image. Through the computational wave-optical analysis, it turns out that the apparent tree diameter converges to a certain value with decreasing the diameter of measured tree. In addition, optimal arrangement of the equipment and minimum detective value are investigated based on this calculation. In case of unfilled epoxy, minimum detective value in the condition of optimal arrangement is found to be 3.5μm.
环氧树脂是广泛应用于电气设备的绝缘材料。由于填料的影响,这种环氧树脂不透明,因此很难在光学上观察到其中的电树。本文用x射线相衬成像观察了未填充和填充环氧树脂中的电树。当x射线穿过非常小的管状材料(如电子树)时,可以获得边缘增强图像。它使探测树木变得更容易,但另一方面,为了从x射线图像中的视树木直径准确地获得树木直径,波光学分析是必要的。通过计算波光学分析,发现随着被测树木直径的减小,树木的视径收敛到一定值。并在此基础上对设备的优化布置和最小探测值进行了研究。在未填充环氧树脂的情况下,最佳布置条件下的最小探测值为3.5μm。
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引用次数: 2
Electron mobility edge in amorphous polyethylene 非晶聚乙烯的电子迁移率边缘
Pub Date : 2016-07-03 DOI: 10.1109/ICD.2016.7547744
M. Unge
The conduction mechanism in a material is to a large extent determined by the nature of the electronic states. Localized states give hopping conduction and delocalized states band transport. In amorphous materials there may be a transition from localized states at the band edges to delocalized states higher up in the band. Here we use linear scaling density functional theory and a percolation method to determine electron mobility in amorphous polyethylene. The electron mobility edge is determined to ~ 0.2 eV.
材料的传导机制在很大程度上是由电子态的性质决定的。局域态给出跳跃传导,局域态给出带输运。在非晶材料中,可能存在从带边缘的局域态到带高处的非局域态的过渡。在这里,我们使用线性缩放密度泛函理论和渗透方法来确定非晶聚乙烯中的电子迁移率。电子迁移率边缘被确定为~ 0.2 eV。
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引用次数: 4
Study on the effect of interface bonding strength on the dielectric properties of epoxy nanocomposites 界面结合强度对环氧纳米复合材料介电性能影响的研究
Pub Date : 2016-07-03 DOI: 10.1109/ICD.2016.7547554
Jing Sun, Peihong Zhang
The interface is critical for the design of nanocomposites with desirable properties, this research try to prove the influence of interface bonding strength between nanofiller and matrix on the dielectric properties (dielectric spectroscopy and conduction current) of epoxy nanocomposites. In this experiments, nanofiller/ethanol suspensions were prepared by ultrasonic vibration method, the four kinds of epoxy resin nanocomposites with 3wt% concentration were made, respectively. The zeta potential of the suspensions were measured by ESA method. The dielectric spectroscopy and the conduction current characteristics of nanocomposite were tested. The zeta potential of the four kinds of suspensions according to the order from small to large is ZnO, MgO, Al2O3 and SiO2 successively, SiO2 nanocomposites shown the lowest permittivity, in addition, the conduction current of the SiO2 composites was also lowest among them except the MgO composites. The results indicate that the higher zeta potential can represent strong interface bonding and make the permittivity and conduction current of the nanocomposites decrease, this is due to the lower polarization strength. In this paper, the addition of SiO2 nanoparticles can provide advantageous performance of epoxy nanocomposites among the four kinds of nanofillers. The interface bonding strength has a major influence on the dielectric property of composites.
界面是设计具有理想性能的纳米复合材料的关键,本研究试图证明纳米填料与基体之间的界面结合强度对环氧纳米复合材料介电性能(介电光谱和导电电流)的影响。本实验采用超声振动法制备纳米填料/乙醇悬浮液,分别制备了浓度为3wt%的四种环氧树脂纳米复合材料。用ESA法测定了悬浮液的zeta电位。测试了纳米复合材料的介电光谱和导电电流特性。四种悬浮液的zeta电位从小到大依次为ZnO、MgO、Al2O3和SiO2, SiO2纳米复合材料的介电常数最低,除MgO外,SiO2纳米复合材料的导电电流也最低。结果表明,较高的zeta电位可以表征较强的界面结合,使纳米复合材料的介电常数和导电电流减小,这是由于较低的极化强度所致。在本文中,在四种纳米填料中,SiO2纳米粒子的加入使环氧纳米复合材料的性能更优越。界面结合强度对复合材料的介电性能有重要影响。
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引用次数: 0
Corona aging and hydrophobicity of surface fluorinated silicone rubbers 表面氟化硅橡胶的电晕老化和疏水性
Pub Date : 2016-07-03 DOI: 10.1109/ICD.2016.7547694
Yujiao Tang, Z. An, F. Shan, F. Zheng, Yewen Zhang
We have reported that hydrophobicity of silicone rubber (SIR) can be significantly enhanced by direct fluorination. In this work, surface fluorinated SIR samples, together with the unfluorinated (virgin) ones were corona treated using a multi-needle-to-plate electrode system, to further evaluate corona resistance of the fluorinated SIR layer. ATR-IR analyses suggest that there may be oxidation of the partially fluorinated methyl groups and cleavage of Si-C bonds during the corona treatment, but the cleavage led to formation of Si-F bonds rather than Si-OH bonds. SEM surface and cross section images show that the corona treatment did not change the fluorinated layer thickness, although surface morphology was changed to some degree. In contrast with this, the virgin surface layer was severely degraded or ablated, forming a degraded layer on which aggregates of silica particles and/or degradation products of the SIR matrix material were left. Measurements of water contact angle and surface potential decay further confirm good resistance of the fluorinated layer to corona discharge.
我们报道了直接氟化可以显著提高硅橡胶(SIR)的疏水性。在这项工作中,使用多针-板电极系统对表面氟化SIR样品和未氟化SIR样品进行电晕处理,以进一步评估氟化SIR层的电晕电阻。ATR-IR分析表明,在电晕处理过程中,部分氟化甲基可能发生氧化,Si-C键断裂,但断裂导致Si-F键而不是Si-OH键的形成。SEM表面和截面图显示电晕处理没有改变氟化层的厚度,但表面形貌有一定程度的改变。与此相反,原始表面层被严重降解或烧蚀,形成一个降解层,上面留下二氧化硅颗粒聚集体和/或SIR基体材料的降解产物。水接触角和表面电位衰减的测量进一步证实了氟化层对电晕放电的良好抵抗能力。
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引用次数: 4
Estimating aging parameter of XLPE and its nanocomposites under AC voltage using step-stress test 用阶跃应力试验估计交联聚乙烯及其纳米复合材料在交流电压下的老化参数
Pub Date : 2016-07-03 DOI: 10.1109/ICD.2016.7547702
Y. Wang, Kai Wu, Jinhua Dong, Chong Zhang, Wenpeng Li
Our previous studies showed that the aging parameter, i.e. the n-value, of XLPE was quite different from that of XLPE nanocomposites. In order to investigate the effects of space charge on aging parameter under DC voltage, the n-values of XLPE and its nanocomposites were measured under AC voltage in this report, because few space charge exits in the sample under AC voltage. Step-stress tests were carried out under AC voltage to measure the n-value. The results showed that the aging parameters of XLPE and its nanocomposites under AC voltage were close, i.e. 7.3 and 6.6, respectively. This suggests that space charge accumulation plays an important role in DC aging.
我们之前的研究表明,XLPE的老化参数n值与XLPE纳米复合材料的老化参数n值有很大的不同。为了研究空间电荷对直流电压下老化参数的影响,本文在交流电压下测量了XLPE及其纳米复合材料的n值,因为在交流电压下样品中几乎没有空间电荷。在交流电压下进行阶梯应力试验,测量n值。结果表明:XLPE及其纳米复合材料在交流电压下的老化参数接近,分别为7.3和6.6;这表明空间电荷积累在直流老化中起重要作用。
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引用次数: 1
期刊
2016 IEEE International Conference on Dielectrics (ICD)
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