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2020 IEEE 3rd International Conference on Dielectrics (ICD)最新文献

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Assessment of Cable Aging for Nuclear Power Plants I&C Cable via Time-Frequency Domain Reflectometry 用时频域反射法评估核电站I&C电缆老化
Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341985
Gu-Young Kwon, Yeong Ho Lee, S. Bang, G. Ji, Geon Seok Lee, Z. A. Tamus, Y. Shin
Instrumentation and control (I&C) cable connected between numerous sensors and main control room contributes to the safe operation of nuclear power plants (NPPs). Some of I&C cables are installed in the place exposed to cable degradation causes such as mechanical damage, heat, and radiation. In this paper, two cable aging assessment parameters extracted from the results of time-frequency domain reflectometry (TFDR) is proposed to maintain the reliable and stable operation of the NPPs. To verify the proposed method, two different EPR insulated cables from distinct manufactures are adopted to accelerated thermal aging test. After aging, the assessment parameters of each cable are calculated, and the trend and linearity of the assessment parameters are observed. It is expected that the proposed method allows to ensure the safe operation of nuclear power plant.
连接众多传感器与主控制室的仪表与控制电缆是核电站安全运行的重要保障。部分I&C电缆安装在易受机械损伤、热和辐射等电缆劣化因素影响的地方。本文提出了从时频域反射法(TFDR)结果中提取的两个电缆老化评估参数,以维持核电站的可靠稳定运行。为了验证所提出的方法,采用不同厂家的两种不同的EPR绝缘电缆进行加速热老化试验。老化后,计算每根电缆的评估参数,并观察评估参数的趋势和线性。期望所提出的方法能够保证核电站的安全运行。
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引用次数: 1
Effects of Magnetic Field on Surface Flashover of Polyimide Film for Superconducting Magnet Insulation 磁场对超导磁体绝缘聚酰亚胺膜表面闪络的影响
Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341999
B. Du, Y. Li, M.Y. Wang, Z.X. Liu, X.T. Han, Y. Zhang, Jin Li, Z.L. Li, H.L. Sun
Polyimide (PI) film is widely used as insulation material in superconducting magnet systems. While operating, the PI film is subjected to the interaction of electric and magnetic fields. The existence of magnetic field will affect charge behaviors leading to the changes in flashover voltage. In this paper, a steady magnetic field up to 1.2 T was applied to the PI films. The flashover voltages were investigated under DC condition and AC condition. Different angles between magnetic and electric fields were set to explore the influence of magnetic field direction on the flashover voltage of PI film. Experimental results show that the $Etimes B$ drifting into the surface will block the secondary electron emission, resulting in an increase in the flashover voltage. When the $Etimes B$ drifts out of the surface the result is just the opposite. The promoting effect of magnetic field on the changes of flashover voltage is weakened under the AC condition, while the suppressive effect is strengthened. The failure mechanism of PI film under strong magnetic field will provide a theoretical basis for improving the insulation reliability of superconducting magnets.
聚酰亚胺(PI)薄膜是一种广泛应用于超导磁体系统的绝缘材料。在工作时,PI薄膜受到电场和磁场的相互作用。磁场的存在会影响电荷行为,导致闪络电压的变化。本文在PI薄膜上施加了高达1.2 T的稳定磁场。研究了直流和交流条件下的闪络电压。设置不同的磁场与电场夹角,探讨磁场方向对PI薄膜闪络电压的影响。实验结果表明,漂移到表面的$E乘以$ B$会阻挡二次电子发射,导致闪络电压升高。当E乘以B$漂出表面时,结果正好相反。交流条件下,磁场对闪络电压变化的促进作用减弱,抑制作用增强。研究PI膜在强磁场作用下的失效机理,将为提高超导磁体的绝缘可靠性提供理论依据。
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引用次数: 2
Benefit of Nonlinear Resistive Field Grading Materials on Medium Voltage Bushing by Finite Element Modeling (Flux 2D) vs Experimental Partial Discharge Measurements 采用有限元模型(Flux 2D)对中压套管进行非线性电阻场分级材料与实验局部放电测量的优势
Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341815
R. Metz, M. Hassanzadeh
The effect of resistive field grading coatings on the electric field distribution in a medium voltage bushing has been studied. A typical coating is obtained by applying a commercial resistive field grading material and a conductive varnish that we both have previously electrically characterized. The electric field distribution over the bushing surface was computed and analyzed using a finite element method software (Flux 2D). The electric field enhancements at its critical points with and without field grading material were considered and confronted with experimental partial discharge detection. The complementary between the field grading material and the conductive varnish is highlighted: a special care of the true capability of the conductive layer to withdraw the electrical charges is stressed out.
研究了电阻场分级涂层对中压套管中电场分布的影响。一种典型的涂层是通过应用商业电阻场分级材料和导电清漆获得的,我们之前都有过电学表征。利用有限元软件Flux 2D对轴套表面电场分布进行了计算分析。考虑了有和没有场级配材料时临界点处的电场增强,并进行了实验局部放电检测。强调了现场分级材料和导电清漆之间的互补:强调了导电层收回电荷的真正能力的特别注意。
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引用次数: 0
From Laboratory to Industrial Scale: Comparison of Short- and Long-Term Dielectric Performance of Silica-Polypropylene Capacitor Films 从实验室到工业规模:硅-聚丙烯电容器薄膜的短期和长期介电性能比较
Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341890
K. Lahti, I. Rytöluoto, Minna Niittymäki, Eetta Saarimäki, M. Paajanen
In this paper a route from laboratory scale samples to full industrial scale production of biaxially oriented silica-PP nanocomposite capacitor films is for the first time shown and verified. Morphological and dielectric characteristics of laboratory scale produced and by full industrial tenter -process produced nanocomposite and neat-PP reference films are presented and compared. In addition to the short-term characteristics also ageing performance of the industrial films are studied. The results show closely comparative dielectric behavior of the films and thus verifies the successful up-scaling of the used nanocomposite recipe. Although certain amount of impurities and voids were observed in both nanocomposite films the low probability dielectric breakdown strength characteristics were considered promising. Modified trap distribution, decreased conductivity and improved dielectric loss behavior has been verified for the nanocomposite film while areas of further development are also recognized.
本文首次展示并验证了从实验室规模样品到全面工业规模生产双轴取向二氧化硅-聚丙烯纳米复合电容器薄膜的路线。介绍并比较了实验室规模生产的纳米复合材料薄膜和完全工业化生产的纳米复合材料薄膜的形态和介电特性。除短期特性外,还研究了工业薄膜的老化性能。结果显示薄膜的介电性能比较接近,从而验证了所使用的纳米复合材料配方的成功放大。虽然在两种纳米复合薄膜中都观察到一定数量的杂质和空隙,但低概率介电击穿强度特性被认为是有前途的。研究结果表明,纳米复合薄膜具有改善陷阱分布、降低电导率和改善介电损耗等特点,并指出了进一步发展的领域。
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引用次数: 1
Separation of superimposed PRPD Patterns by Signal Clustering 基于信号聚类的PRPD叠加模式分离
Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341858
B. Adam, S. Tenbohlen, M. Beltle
Partial discharges are one of the main reasons of insulation failure in transformers. Multiple partial discharge sources in HV equipment can be active at the same time. Diagnosis is complicated by superimposed or overlapping patterns in the PRPD patterns. In order to classify the fault source correctly, the patterns must be separated first. In this paper we propose a method to separate partial discharge signals from different sources by their impulse waveform. A feature-set is constructed by selecting relevant features from a pool of 700 identified possible features. Then, different sources are separated by clustering techniques. Centroid-based clustering methods like the k-means algorithm are compared to density-based approaches like DBSCAN. After clustering multiple PRPD patterns can be calculated – one for each source. This method is developed on artificial partial discharge data, measured in the laboratory. Four different typical defect types are considered. Through multiple case studies we show, that the separation process works on different kinds of PD problems. This method works for all kinds of PD faults. It is shown, that PD sources not present in the training data used for development can also be separated reliably.
局部放电是变压器绝缘失效的主要原因之一。高压设备中的多个局部放电源可以同时处于活动状态。诊断是复杂的重叠或重叠模式的PRPD模式。为了正确地对故障源进行分类,必须首先对模式进行分离。本文提出了一种根据脉冲波形分离不同源局部放电信号的方法。通过从700个确定的可能特征池中选择相关特征来构建特征集。然后,通过聚类技术分离不同的源。基于质心的聚类方法(如k-means算法)与基于密度的方法(如DBSCAN)进行比较。聚类后,可以计算多个PRPD模式-每个源一个。该方法是在实验室测量的人工局部放电数据基础上发展起来的。考虑了四种不同的典型缺陷类型。通过多个案例研究,我们表明,分离过程适用于不同类型的PD问题。该方法适用于各种PD故障。结果表明,用于开发的训练数据中不存在的PD源也可以可靠地分离。
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引用次数: 0
Investigation of the Breakdown Voltage of Insulation Oils at Medium Frequency after Thermal Ageing 绝缘油热老化中频击穿电压的研究
Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341873
J. Vocke, R. Möller, R. Puffer, B. Soppe
Insulating oils and medium-frequency high voltages come together primarily where power electronic components are used, such as in power electronic transformers. For reliable long-term use, the insulation behaviour and, in particular, the breakdown voltage of the insulating oils at medium-frequency voltages is relevant, especially under consideration of ageing. Therefore, this paper investigates the influence of thermal ageing on the dielectric strength of insulating oil at medium frequency with an accelerated ageing test. Three insulating oils are each stored together with copper plates and insulating paper at 120 °C with controlled addition of air for an accelerated ageing. An oil sample is taken at fixed intervals and the breakdown voltage is determined for 2.2 kHz, 5.3 kHz and 8.6 kHz. In addition, the dielectric properties, acid number, water content and viscosity of each sample are determined. The investigations show a clear ageing dependency only for the acid number and the loss factor, all other parameters examined do not show such trend.
绝缘油和中频高压主要在使用电力电子元件的地方结合在一起,例如电力电子变压器。为了可靠的长期使用,绝缘性能,特别是绝缘油在中频电压下的击穿电压是相关的,特别是在考虑到老化的情况下。为此,本文采用加速老化试验研究了热老化对绝缘油中频介电强度的影响。三种绝缘油分别与铜板和绝缘纸一起储存在120°C下,控制空气的添加以加速老化。以固定的间隔取样,并确定击穿电压为2.2 kHz、5.3 kHz和8.6 kHz。此外,还测定了各样品的介电性能、酸值、含水量和粘度。研究表明,只有酸值和损失因子具有明显的老化依赖性,所有其他参数均未显示出这种趋势。
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引用次数: 2
Influence of Demetallization Processes on Capacitor Grade Polymer Films Breakdown Strength 脱金属工艺对电容器级聚合物薄膜击穿强度的影响
Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341912
V. Belko, O. Emelyanov, I. Ivanov, N. Fedotov
The influence of metallized polypropylene demetallization processes, such as an electric explosion of metal layer and metal evaporation due to surface arc discharge, was investigated. 6 $mu$ m thick polymer film with aluminum and zinc metallization were tested. It was found that electric explosion and surface arc impact on polymer surface cause 20 and 30 percent reduction of breakdown strength for aluminum metallization, and 14 and 21 percent for zinc metallization, respectively. The results are useful for choosing the parameters of MFC voltage overstressing regimes.
研究了金属层电爆炸和表面电弧放电引起的金属蒸发等工艺对金属化聚丙烯脱金属的影响。对6 μ m厚的铝锌金属化聚合物薄膜进行了测试。结果表明,电爆炸和表面电弧对聚合物表面的冲击分别使金属化铝的击穿强度降低20%和30%,金属化锌的击穿强度降低14%和21%。研究结果对MFC电压过应力区参数的选择有一定的参考价值。
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引用次数: 1
Preparation and Electromechanical Performance Analysis of Self-healing Electrostrictive Polymer 自愈电致伸缩聚合物的制备及机电性能分析
Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341837
Z. Zhang, Youyuan Wang, Xiaosong Zhu, Yudong Li, Hongrui Gu
The development of self-healing electrostrictive materials is helpful to improve the life of flexible electronic devices. In this paper, a polar elastomer-modified dielectric elastomer has achieved self-healing of shear damage at room temperature. The MG-SBS material was obtained by grafting methyl methyl thioglycolate (MG) onto styrene-butadiene- styrene (SBS) block copolymer by click chemical reaction. Tensile testing, mechanical dynamic thermal analysis, and broadband dielectric spectroscopy were used to analyze the performance of MG-SBS. Studies have shown that the CH/$pi$ bond enables MG-SBS materials to achieve self-healing of shear damage. MG-SBS is close to the electrostrictive properties of acrylic at lower temperature. The temperature stability of the electrostrictive performance is its unique advantage. The material will help improve the damage self-healing ability and temperature adaptability of flexible electronic devices.
自愈电致伸缩材料的发展有助于提高柔性电子器件的寿命。本文研究了一种极性弹性体修饰介电弹性体,在室温下实现了剪切损伤的自修复。将甲基巯基乙酸甲酯(MG)接枝到苯乙烯-丁二烯-苯乙烯(SBS)嵌段共聚物上,通过点击化学反应制得MG-SBS材料。利用拉伸测试、力学动态热分析和宽带介电光谱分析了MG-SBS的性能。研究表明,CH/$pi$键能使MG-SBS材料实现剪切损伤的自愈。MG-SBS在较低温度下接近丙烯酸的电致伸缩性能。电致伸缩性能的温度稳定性是其独特的优点。该材料将有助于提高柔性电子器件的损伤自愈能力和温度适应性。
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引用次数: 0
The Role of Filler Interface in Suppressing the Erosion of Silicone Rubber Under DC Voltage 填料界面在抑制直流电压下硅橡胶腐蚀中的作用
Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341937
Alhaytham Alqudsi, R. Ghunem, É. David, Y. Hadjadj
The presented paper aims to highlight the role of fillerpolymer interface on the DC erosion resistance of silicone rubber (SiR) outdoor insulators. SiR composites filled with nano-sized boron nitride and fumed silica have been prepared in this study. Electrical and thermal experimental tools of the inclined plane tracking-erosion test, simultaneous thermogravimetric-differential thermal analyses, and thermal conductivity measurements are used to analyze the prepared nanocomposites. The analysis primarily investigates whether the composite’s enhancement of thermal conductivity or filler interface would be more influential on erosion suppression. Literature reports that the boron nitride filler improves SiR’s thermal conductivity, whereas fumed silica provides an exceptional interaction with SiR at the filler interface. SiR was filled with boron nitride at 5wt% (percent by weight) and 10wt%, while fumed silica was loaded with 5wt% and used as a reference composite in the study. The obtained results clearly indicate a superior erosion resistance of the silica filled SiR over the boron nitride filled one. An observation which seemingly could give more significant role of the filler-polymer interface on the erosion resistance of SiR used for high voltage DC outdoor insulators.
研究了填料-聚合物界面对硅橡胶室外绝缘子抗直流侵蚀性能的影响。本研究制备了以纳米氮化硼和气相二氧化硅填充的SiR复合材料。采用斜面跟踪-侵蚀试验、同步热重-差热分析和导热系数测量等电学和热实验工具对制备的纳米复合材料进行了分析。分析主要探讨了复合材料的热导率增强和填料界面增强孰优孰劣。文献报道,氮化硼填料提高了SiR的导热性,而气相二氧化硅在填料界面上提供了与SiR的特殊相互作用。SiR分别以5wt%(重量百分比)和10wt%填充氮化硼,而气相二氧化硅则以5wt%填充,作为研究中的参考复合材料。所得结果清楚地表明二氧化硅填充的SiR比氮化硼填充的SiR具有更好的抗侵蚀性能。这一观察结果似乎可以说明填料-聚合物界面对高压直流室外绝缘子用SiR的耐冲蚀性能有更重要的作用。
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引用次数: 0
Life modeling analysis of Silane crosslinked polyethylene cables for nuclear applications 核用硅烷交联聚乙烯电缆寿命建模分析
Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341894
S. V. Suraci, D. Fabiani
In this article, the evaluation of the electrical and mechanical properties of short XLPE cables subjected to radio-chemical aging is reported. From these results, an initial multi-physics life modelling approach is presented. In particular, the proposed modelling of the electrical properties (here complex permittivity) showed to successfully assess of the health of the cables through non-destructive techniques putting the basis of a diagnostic method for cable management on site.
本文报道了短交联聚乙烯(XLPE)电缆经放射线化学老化后的电性能和力学性能评价。根据这些结果,提出了一种初步的多物理场生命建模方法。特别是,所提出的电性能建模(这里是复合介电常数)表明,通过非破坏性技术成功地评估了电缆的健康状况,为现场电缆管理的诊断方法奠定了基础。
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引用次数: 2
期刊
2020 IEEE 3rd International Conference on Dielectrics (ICD)
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