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Proceedings of 1995 International Symposium on Electrical Insulating Materials最新文献

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Use of functionally gradient material in a temperature measuring element 在温度测量元件中使用功能梯度材料
Pub Date : 1995-09-17 DOI: 10.1109/ISEIM.1995.496525
S. Watanabe, K. Aoki, H. Iwata, N. Hayashi, A. Ohashi, Y. Kinoshita, Y. Uchida, D. Dykes, G. Touchard
An idea of gradient functions has recently developed in Japan, giving birth to an entirely new concept in materials. The formal name for the new materials is "functionally gradient materials", or FGMs for short. Application fields for FGMs are found throughout the various sectors of engineering. None of the methods of manufacture or other previously existing ones, allowed the manufacture of a comprehensive range of FGM thicknesses extending from less than 1 millimetre to several centimetres. The authors have developed a new method of FGM manufacture, for which a US patent has been granted. Using this method, it has became possible to produce FGMs across the whole range of thickness from a few millimetres up to several tens of centimetres. We call this new method "progressive lamination". The present paper examines the resistance-temperature properties of material manufactured by this method. It is found that measurements of temperature differences down to as small as 0.1/spl deg/C are practicable. The material is well within the range of suitability for use as a thermistor.
梯度函数的概念最近在日本发展起来,产生了一个全新的材料概念。这种新材料的正式名称是“功能梯度材料”,简称fgm。fgm的应用领域遍及工程的各个部门。没有一种制造方法或其他先前存在的方法允许制造从不足1毫米到几厘米的全面范围的女性生殖器切割厚度。作者开发了一种制造女性生殖器的新方法,并已获得美国专利。使用这种方法,可以生产从几毫米到几十厘米的整个厚度范围内的fgm。我们称这种新方法为“渐进层压”。本文研究了用这种方法制备的材料的电阻-温度特性。我们发现,测量小到0.1/spl℃的温差是可行的。这种材料完全在适合用作热敏电阻的范围内。
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引用次数: 0
Water absorption of extruded cable components 挤压电缆组件的吸水率
Pub Date : 1995-09-17 DOI: 10.1109/ISEIM.1995.496528
S. Pélissou
The water absorption of various kinds of cable insulation and shields has been studied. The three water tree crosslinked polyethylene (WTRXLPE) materials absorb a large amount of water compared to ordinary XLPE, probably because of the polar character of the WTR material. One WTRXLPE seems to lose its effectiveness at 80/spl deg/C. EPR has also a great water content capability but less than the WTRXLPE. It is clear from this work that new cable insulation and shields absorb much more water than conventional ones.
对各种电缆绝缘和屏蔽层的吸水性进行了研究。三水树交联聚乙烯(WTRXLPE)材料比普通XLPE吸收大量的水,可能是因为WTR材料的极性特性。一个WTRXLPE似乎在80/spl度/C时失去其有效性。EPR的含水率也很好,但低于WTRXLPE。从这项工作可以清楚地看出,新的电缆绝缘和屏蔽比传统的吸收更多的水。
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引用次数: 2
Analysis of partial discharge phenomena by discharge magnitude and discharge luminescence in each phase angle 通过放电幅度和各相角下的放电发光分析局部放电现象
Pub Date : 1995-09-17 DOI: 10.1109/ISEIM.1995.496542
K. Urano, Y. Ehara, H. Kishida, T. Ito
This research was carried out to analyze the treeing phenomena from a needle shape void by discharge pulses and a discharge luminescence in each phase angle area. The discharge pulse and the discharge luminescence were measured by a special measuring system to analyze a discharge magnitude and a discharge luminous intensity image according to several phase angle areas of applied voltage. In particular, in this study, we focused on the discharge luminescence in each phase angle area. The luminous image was recorded on a CCD camera, and the image was digitized by a computer after the experiment.
通过放电脉冲和各相角区域的放电发光,分析了针状空腔的树形现象。利用专用测量系统对放电脉冲和放电发光进行测量,根据外加电压的几个相角区域分析放电幅度和放电发光强度图像。特别地,在本研究中,我们重点研究了各个相角区域的放电发光。在CCD相机上记录发光图像,实验结束后用计算机对图像进行数字化处理。
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引用次数: 0
A newly developed leakage current monitoring system for the assessment of insulator pollution severity 一种新开发的绝缘子污染严重程度评估泄漏电流监测系统
Pub Date : 1995-09-17 DOI: 10.1109/ISEIM.1995.496573
Ziyu Zhao, Hengkun Xie, Zongren Peng
Surface pollution is one of the contributing factors of insulator flashovers at rated voltage. Therefore in order to prevent transmission line insulators from experiencing flashover, it is very important to investigate the leakage current monitoring system to assess the pollution severity of insulators. In this paper, a newly developed leakage current monitoring system with a microcomputer-controlled device for voltage application duration control and data acquisition recording is presented. By using this new monitoring system, the conductivity of the pollution layer and the leakage current on the insulator surface can be monitored continually, hence the pollution severity can be displayed, and when pollution severity is in excess of predetermined criterion a warning signal will be released. The design consideration for the new system and the criteria of assessing pollution severity are discussed, and some on-site test results are also given in this paper.
表面污染是造成额定电压下绝缘子闪络的因素之一。因此,为了防止输电线路绝缘子发生闪络,研究绝缘子的漏电流监测系统以评估绝缘子的污染程度是非常重要的。本文介绍了一种新型的泄漏电流监测系统,该系统采用微机控制装置,具有电压施加、持续时间控制和数据采集记录功能。利用该监测系统,可以对污染层的电导率和绝缘子表面的泄漏电流进行连续监测,从而显示污染程度,当污染程度超过预定标准时发出预警信号。本文讨论了新系统的设计考虑和污染程度评定标准,并给出了一些现场试验结果。
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引用次数: 4
Low molecular weight silicone fluid content and diffusion in RTV silicone rubber coating 低分子量硅流体在RTV硅橡胶涂层中的含量和扩散
Pub Date : 1995-09-17 DOI: 10.1109/ISEIM.1995.496538
H. Deng, R. Hackam, E. Cherney
Room temperature vulcanizing (RTV) silicone rubber has been widely used to coat porcelain insulators to render water repellency to prevent formation of water filming on the surface and thus to suppress the leakage current and consequent flashover. The hydrophobicity is maintained even after a layer of contamination has built-up on the surface. This has been attributed to the diffusion of the low molecular weight (LMW) silicone fluid from the bulk to the surface of the RTV and then on to the surface of the pollution deposits. It has been reported that there was a reduction in the quantity of LMW polymer chains on the surface of an aged RTV specimen when compared to a virgin specimen. This paper explores some of the factors governing the lifetime of the RTV coating. Alumina trihydrate (ATH) filler and various formulations were used. The content of LMW silicone fluid and the diffusion of LMW from the bulk to the surface were determined in RTV coatings having thicknesses from 0.17 to 0.99 mm, ATH particles from 1.0 to 75 /spl mu/m and different carrier solvents, by using extraction techniques in analytical hexane. The roles of the LMW content and the diffusion process in the lifetime of the coating were evaluated for different formulations of RTV.
室温硫化硅橡胶(RTV)已被广泛用于涂覆瓷绝缘子,以提供拒水性,防止表面形成水膜,从而抑制泄漏电流和由此产生的闪络。即使在表面积聚了一层污染物后,疏水性仍能保持。这是由于低分子量(LMW)硅酮流体从本体扩散到RTV表面,然后扩散到污染沉积物的表面。据报道,与原始样品相比,老化RTV样品表面上的LMW聚合物链的数量有所减少。本文探讨了影响RTV涂层寿命的一些因素。采用了三水合氧化铝(ATH)填料和各种配方。采用分析己烷萃取技术,在厚度为0.17 ~ 0.99 mm、ATH颗粒为1.0 ~ 75 μ l /m的RTV涂层和不同载体溶剂中,测定了LMW硅酮液的含量和LMW从体向表面的扩散。研究了不同RTV配方中LMW含量和扩散过程对涂层寿命的影响。
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引用次数: 8
A model for electrical treeing discharges in polyethylene 聚乙烯中电气树放电的模型
Pub Date : 1995-09-17 DOI: 10.1109/ISEIM.1995.496604
Suwarno, Y. Suzuoki, T. Mizutani, K. Uchida
Properties of partial discharges associated with electrical treeing are briefly explained and a model is proposed. Based on the proposed model, a computer simulation was carried out by using the Monte Carlo method. It was deduced from the simulation that the tree channel length and its distribution determine the PD pattern. The PD patterns of tree initiation and tree-like trees were obtained from short and long channels with a broad distribution, respectively. Those from the bush-like trees were obtained from long channels with a narrow distribution.
简要解释了与电树相关的局部放电的性质,并提出了一个模型。在此基础上,利用蒙特卡罗方法进行了计算机仿真。仿真结果表明,树形通道长度及其分布决定了局部放电模式。树起始和树状树的PD模式分别来自短通道和长通道,分布广泛。灌木状乔木在长通道中获得,分布狭窄。
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引用次数: 7
Interface effect on treeing deterioration in XLPE/EX composite materials 界面效应对XLPE/EX复合材料树形劣化的影响
Pub Date : 1995-09-17 DOI: 10.1109/ISEIM.1995.496534
Yuan Changmin, N. Yoshimura, Lim, Jangseob, H. Miyata, T. Niwa
An experimental investigation has been carried out for evaluating the treeing deterioration characteristics of composite materials by preparing an interface between cross-linked polyethylene and epoxy resin (XLPE/EX). The results under various interface conditions are described in this paper. It is found that the interface has a great effect on the treeing breakdown pattern and on the time to breakdown under various interface conditions.
通过制备交联聚乙烯/环氧树脂(XLPE/EX)界面,对复合材料的树状劣化特性进行了试验研究。本文描述了在不同界面条件下的实验结果。研究发现,在不同的界面条件下,界面对树状击穿模式和击穿时间有很大的影响。
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引用次数: 0
Effects of solvent extraction on electrical properties of LDPE 溶剂萃取对LDPE电性能的影响
Pub Date : 1995-09-17 DOI: 10.1109/ISEIM.1995.496595
K. Suh, Kyung Won Lee, Mikyung Lee
This work was carried out to elucidate the role of small polyethylene chains in the space charge behavior of LDPE. The samples were xylene extracted at different temperatures to control the concentration of small chains. Their conduction and charge distributions were measured and the role of small chains discussed. It was found that the type of charge depended on the type of polyethylene, solvent extraction may reduce the charge in some (but not all) polyethylenes, and solvent extraction reduces conduction currents but does not affect the conduction mechanism.
这项工作是为了阐明聚乙烯小链在LDPE空间电荷行为中的作用。样品在不同温度下提取二甲苯,以控制小链的浓度。测量了它们的传导和电荷分布,并讨论了小链的作用。研究发现,电荷类型取决于聚乙烯的类型,溶剂萃取可以降低部分(但不是全部)聚乙烯的电荷,溶剂萃取可以降低导电电流,但不影响导电机理。
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引用次数: 1
Space charge evolution in acetophenone impregnated LDPE sheets 苯乙酮浸渍LDPE片材的空间电荷演化
Pub Date : 1995-09-17 DOI: 10.1109/ISEIM.1995.496599
T. Takeda, N. Hozumi, H. Suzuki, T. Okamoto, K. Watanabe, A. Watanabe, H. Miyata
Non-uniform distribution of acetophenone was simulated by impregnating acetophenone into low density polyethylene (LDPE). Space charge evolution under DC high voltage was then measured by the pulse electroacoustic method. An independent peak appeared in the vicinity of the acetophenone impregnated electrode, the polarity of the peak being the same as the electrode. FT-IR measurement showed a significant gradient in the acetophenone content in the insulation.
通过将苯乙酮浸渍在低密度聚乙烯(LDPE)中,模拟了苯乙酮的不均匀分布。然后用脉冲电声方法测量了直流高压下空间电荷的演化。在苯乙酮浸渍电极附近出现了一个独立的峰,其极性与电极相同。傅里叶变换红外光谱(FT-IR)测量表明,绝缘材料中苯乙酮的含量呈显著的梯度变化。
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引用次数: 0
Partial discharge pulse phase patterns on operating motors and generators 运行中的电动机和发电机的局部放电脉冲相位图
Pub Date : 1995-09-17 DOI: 10.1109/ISEIM.1995.496546
J. Kapler, G. Stone, H. Sedding
Many hundreds of partial discharge test results on about 100 operating motors and generators have been reviewed. In the majority of results, the position of the partial discharges with respect to the 600 Hz phase angle was as expected from conventional partial discharge theory, as well as laboratory experiments. However, perhaps 25490 of the PPA plots were "abnormal" in some way. Yet these patterns are real, and are not due to noise, nor are they artifacts of the measurement system. Researchers developing pattern recognition techniques for PD pulses should be aware that patterns from operating high voltage equipment may be much more complex than the patterns obtained in laboratory apparatus.
对大约100台运行中的电动机和发电机进行了数百次局部放电试验。在大多数结果中,相对于600 Hz相位角的部分放电位置与传统的部分放电理论以及实验室实验所期望的一致。然而,可能有25490个PPA地块在某种程度上是“异常”的。然而,这些模式是真实的,不是由于噪声,也不是测量系统的工件。开发PD脉冲模式识别技术的研究人员应该意识到,操作高压设备的模式可能比在实验室仪器中获得的模式复杂得多。
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引用次数: 1
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Proceedings of 1995 International Symposium on Electrical Insulating Materials
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