共查询到20条相似文献,搜索用时 46 毫秒
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高压输电电缆线路以其安全可靠、节省空间和美化城市的特点,符合了城市化、现代化的发展要求,得到越来越多的采用。至2008年6月,深圳市共有110kV及以上输电电缆线路超过了300km,主要集中在比较繁华的城区。不少高压电缆线路在恶劣的环境下长期重负荷甚至超负荷运行。部分已经出现了外护套绝缘偏低或者损坏的问题。为了保证供电安全,加强了电缆线路的外护套绝缘的定期检测, 相似文献
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针对单芯高压电缆在敷设施工后出现的外护套耐压试验无法通过的情况,分析外护套故障产生的原因和故障定位的几种方法。基于高压电桥定位法,给出了相关的故障查测经验和技巧,同时介绍了对电缆外护套故障进行修复的方法。 相似文献
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110kVXLPE电缆故障定位 总被引:2,自引:2,他引:2
110 k V交联聚乙烯绝缘电缆故障定点测量是技术难题。电缆金属护层交叉互联电缆线路的故障定点测量则更加困难。介绍了南京供电局 110 k V珠江路 2号线电缆故障定点测量的方法和采取的措施。 相似文献
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做好交联聚乙烯绝缘电缆的交接和预防性(重做终端和接头)试验是保证安全运行的重要工作。为此,阐述了交联聚乙烯绝缘电缆的交接和预防性试验有关问题,提出6~10kV和35kV交联聚乙烯绝缘电缆不同的试验方法和内容。并指出传统的直流耐压试验存在不足之处,对交联聚乙烯绝缘电缆的交接和预防性试验应优先采用变频率串联谐振试验。 相似文献
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本文就ABB公司XLPE绝缘电缆的一系列新应用进行简单介绍,它的特点是采用电缆作为绕组,并就电缆做绕组产生的一系列与传统电磁装置的许多不同特性进行分析比较。通过比较,可以认为XLPE绝缘电缆绕组的新型电力设备将是21世纪电力的主流产品。 相似文献
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局部放电不合格对交联电力电缆是致命缺陷 ,一旦发生就必须进行定位 ,找出故障点。利用 Fox Base数据库管理系统编制的《交联电缆局部放电定位》程序对交联电缆进行故障点定位可以提高定位的准确性和工作效率 ,便于积累原始定位数据 ,分析统计各类不合格出现的几率 ,从而有效地指导生产。 相似文献
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This paper describes an application of ESCA analysis to semiconducting materials in XLPE power cables in terms of the oxygen ratio (integrated intensity of oxygen spectrum/integrated intensity of carbon spectrum). Analyzed materials were carbon black, an additive mixed into semiconducting materials, and several semiconducting materials treated in various cross‐linking conditions. It was found that the additive increases the oxygen ratio of semiconducting materials as well as does the cross‐linking treatment. The higher the oxygen ratio of the semiconducting materials, the smaller is the average lamellar angle in the XLPE insulation at the semiconducting interface. The angle is thought to be a parameter which expresses the hyperstructure of polymer insulation and smaller angles correspond to a better state of the semiconducting interface in XLPE power cables. © 1998 Scripta Technica, Electr Eng Jpn, 126(2): 15–22, 1999 相似文献
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Katsuichi Ohata Ginzo Katsuta Zensuke Iwata Yoshio Maruyama Yasuo Sekii Mamoru Kanaoka 《Electrical Engineering in Japan》1993,113(5):59-70
To study the long-term characteristics of XLPE cables installed in free air and in water, aging tests were conducted under various testing conditions using XLPE cables with both 3.5 mm and 6 mm insulation. From the Weibull plots of lifetime distribution under the voltage stress EL as the minimum breakdown strength, the minimum value of time to breakdown tL under the constant voltage was estimated. The results of accelerated aging tests of XLPE cables installed in free air demonstrated that the V-t characteristics of XLPE cables could not be described by the conventional inverse power law (t ∝ V−n) with a single constant life exponent n. Based on the microscopic observation of a sliced insulation removed from XLPE cables, it was concluded that bow-tie trees with longer tree length observed in cables tested in water were caused by the moisture from outside, whereas the trees in cables tested in free air were caused by the residual moisture originally existing in the insulation. The breakdown strength of the aged cables tested in water increases through cable drying. However, it does not recover to the original values. 相似文献
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Kenji Kaminaga Masaki Ichihara Mitsuo Jinno Teruyoshi Tanabe Sadao Fukunaga Mamoru Kanaoka Hajime Takehana 《Electrical Engineering in Japan》1997,118(1):28-40
A 500-kV XLPE insulated cable with an insulation thickness of 27 mm has been developed for long-distance transmission lines. Basic studies on the 500-kV XLPE cable have shown that contaminants in the insulation may determine electrical performance. This hypothesis is justified by the good correlation obtained between statistical estimations of the size of the largest contaminant in the insulation and electrical characteristics of full-size cables. Voltage-withstand and long-term tests have confirmed design values for minimum breakdown stress, ac and impulse voltage, and degradation coefficients. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (1): 28–40, 1997 相似文献
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高压交联聚乙烯(XLPE)电力电缆的绝缘老化状态关系到供电可靠性,故电缆绝缘老化状态检测及评价方法的研究意义重大。对于高压电缆的绝缘老化状态检测及评价,国内外已有相关研究成果,文中总结了目前常用的高压电缆绝缘状态离线、在线检测及评价方法。离线检测手段准确性高,但不适于对在役电缆进行大面积取样检测;在线监测的环境干扰因素太多,存在的干扰会对监测结果产生影响,有一定检测局限性,且缺乏大量的实验数据支撑;而对于电缆绝缘老化状态评价方法,尚未有广泛认可的评价标准和体系。文中在总结概述现有方法的基础上,提出了目前电缆老化绝缘状态综合评价方法存在的难点及未来电缆绝缘老化评价研究可提升的方向。 相似文献