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《南方电网技术》2017,(12)
随着电力电缆技术的不断成熟以及电缆附件新技术的不断更新,高压电缆线路的故障特点及各故障原因占比已发生了较大变化。本文通过对南方电网在2006—2016年间发生的132起110 kV及以上电缆系统故障及文献查阅的99起故障案例进行详细统计,全面分析了近年来高压电缆系统的故障特征及其主要原因。统计结果表明:相比2001年,目前南方电网高压电缆线路运行可靠性明显提高,故障率下降了约一个数量级;电缆附件已成为目前高压电缆线路的最大薄弱环节,在不计及外力破坏时,电缆附件故障占比高达85.5%;对于电缆本体,70%以上的故障是由于外力破坏造成,而对于电缆附件故障,84%以上是由于产品质量和施工安装不当引起。该统计分析结果可为制订电力电缆系统差异化运维策略提供依据。 相似文献
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高压交联电力电缆附件选型的若干问题 总被引:10,自引:0,他引:10
高压交联电缆附件的正确选型不仅影响电缆工程的施工和投资,也直接影响电缆系统的安全运行和使用寿命。章扼要分析了当今国内、外常用产品的结构特点及制造、安装和使用中应注意的问题,提出高压交联电缆附件的选型原则,并对涉及结构选型方面的一些问题进行了探讨。 相似文献
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根据近年来城市电网地下输电系统用110kV及220kV电力电缆附件的研制开发情况,着重介绍了充油电缆的预制型塞止接头与电缆导体插入连接全封闭气体绝缘组合开关(GIS)电缆终端;叙述了交联电缆附件研究开发的情况,特别是关于交联电缆预模制附件的橡胶应力锥设计原则,以及橡胶应力锥与填充剂相容性试验;并预测了我国地下输电系统用高压电缆附件今后发展的趋向。 相似文献
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<正> 目前国内的电缆施工,仍然大量采用传统的沥青绝缘胶、松香基绝缘胶和双组份环氧浇注树脂,作为电缆的终端接头和中间接头的绝缘和密封。随着中、高压电力电缆绝缘材料的橡胶化、塑料化,上述绝缘胶已不能满足橡塑电缆施工的要求。国外在六十年代,就着手研制橡塑电缆施工用的双组份室温固化聚氨酯浇注树脂,至今已研制开发了各种类型的品种,以满足交联聚乙烯电缆和其他各种橡塑电缆施工的需要。而国内一直到八十年代仍属空白。为了满足国内电力部门和电讯部门的需要,长沙电缆附件厂于 相似文献
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为了可靠检测高压电缆铅封状态,解决人工铅封检查效率低下电缆附件故障高的问题,提出高压电缆附件铅封缺陷涡流检测方法。通过分析高压电缆附件铅封常见结构、缺陷,根据涡流检测原理与特点,提出铅封涡流检测的影响因素及适用理论。获取铅封试样制作铅封模拟缺陷,调试铅封涡流检测专用探头、仪器参数,采集、评价有缺陷和无缺陷位置涡流图谱并实施应用试验,验证了依靠常用涡流检测设备检测高压电缆附件铅封表面开裂缺陷的可行性。证明了不拆除外部绝缘条件下的高压电缆附件铅封涡流检测可靠性,铅封试样的涡流检测具有不受检测位置影响、检测速度快、检测精度高的优势。试验研究结果为完善高压电缆附件铅封涡流检测工艺,开展高压电缆铅封接头故障检测提供了有效技术参考。 相似文献
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对光缆通信线路受外力的影响,产生多发性故障的原因进行了分析,并提出了预防措施和方法,使光纤通信故障不断减少,确保通信畅通。 相似文献
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《Industry Applications Magazine, IEEE》2007,13(2):24-35
This article addresses one of the motor drive system components, the cable and it addresses its benefits and proper installation. Variable-frequency AC drives are recommended wherever speed variation is required in the range of 50-100%. Research conducted on the cable found that continuous, welded, and corrugated sheath cable with three ground wires minimized and redirected the common-mode current away from the motor. Successful installations require attention to the selection of cable, armor terminators, grounding techniques, and the mechanical limits applicable to the cable being installed 相似文献
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从安全性能、燃烧特性、烟密度等方面分析、比较了CMP级电缆与低烟无卤阻燃电缆,进而得出CMP级电缆作为大型数据中心布线首选的必要性和实用性以及低烟无卤电缆的局限性。最后探讨了CMP电缆的发展及发展瓶颈。 相似文献
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The increasing use of nonmetallic cables in cable trays for industrial plant applications as recognized in the 1975 National Electrical Code, Article 340, mandates that these cables be suitable for this application and that the outer sheath be flame-retardant. The significance of various flame tests is discussed, and data obtained following procedures and modifications of IEEE Standard 383-1974, Section 2.5, are presented. It is evident that nonmetallic sheathed tray cables are available that will comply. Furthermore, when a flame-resistant jacket is applied over type ALS, MC, or AC armored assemblies, it results in an exceptionally rugged, corrosion, and flame-resistant nonpropagating construction. 相似文献
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《Potentials, IEEE》2000,19(4):26-27
Cable TV network's ability to provide fast data transmission using cable modems is receiving much attention these days. A cable modem (or cable TV modem) is a device that connects your computer to the cable TV network. The cable television (CATV) industry was born in 1948 as a way to provide TV reception to remote viewers. However, CATV's marriage to television basically obscured the fact that it can provide high-speed two-way data communication services. A cable modem is a modem in the sense that it MOdulates and DEModulates signals. However, a cable modem is far more complex than a typical telephone dial-up modem. A cable modem is partly modem, partly bridge, partly router, partly encryption/decryption device, partly NIC card, and partly Ethernet hub. A single cable modem connection speed is about 500 kbp-1.5 Mbps, and is used for point-to-point. The distance can be 100 km or even more 相似文献