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为了提高光缆线路的可靠性,采用无金属线的光缆,这对避免雷击或强电的损害消除了内在因素。但无金属线光缆的外部还有金属护层,在这种情况下,光缆还要不要采取防雷防腐或其它防范措施呢?本文将就此问题进行讨论,以寻求无金属光缆防护的最佳方案。 相似文献
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论光缆线路防雷的思路 总被引:2,自引:1,他引:1
从光缆线路的固有特殊性以及光缆线路遭受雷击的机理出发,在以往电缆防雷取得理论和技术成果的基础上,论证了光缆线路上防雷及防强电技术,提出了有别于电缆防护技术的新思路,以及在各个环节上确保光缆PE护套的质量对防雷的有效性。 相似文献
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关于地下光缆线路与市郊大树间防护隔距的计算 总被引:1,自引:0,他引:1
结合雷击现场的实际,以理论计算方式分析了地下光缆线路与市郊孤立大树间的防雷隔距,包括对穿放在塑料护套中的地下光缆线路耐雷电冲击的防护隔距安排的分析。 相似文献
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结合雷击现场的实际,以理论计算方式分析了地下光缆线路与市郊孤立大树间的防雷隔距,包括对穿放在塑料护套中的地下光缆线路耐雷电冲击的防护隔距安排的分析。 相似文献
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光缆以其良好的防护性能和非金属传递材料,形成光传递特有的方式,使其与传统的电缆和明线有质的区别。因此光缆的防雷避雷问题往往被忽视,有相当一部分人错误地认为:光缆是用非金属玻璃纤维来传递广播电视信号的,不会遭受雷击。来自各方面的资料表明,随着光缆被大量使用,光缆线路因雷击遭到严重破坏的事件时有发生,其后果往往比电缆、明线等线路更严重。因此,在当前有线广播电视网发展中,充分认识广播电视光缆线路防雷避雷的重要性和迫切性是一个亟待解决的新课题。1 光缆线路落雷的原因雷电是一种常见的自然现象,经常给人类造成灾害。通常… 相似文献
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OPGW雷击断股的机理及对策 总被引:1,自引:0,他引:1
杜天苍 《光纤与电缆及其应用技术》2006,(3):28-31
针对OPGW雷击断股问题,指出了雷电形成电弧时产生的高温是OPGW雷击断股的主要原因,对不同状况下OPGW雷击断股的主要因素进行了剖析,同时制定出相应的预防措施.对广东省500 kV江茂乙线OPGW雷击情况进行具体分析,认为原材料缺陷、加工工艺缺陷、接地方式、雷击形成的电弧损害和光缆抗雷击能力不足等都能引起OPGW断股,指出了提高OPGW抗雷击能力需解决的关键问题. 相似文献
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光纤光缆最新进展 总被引:1,自引:1,他引:1
刘有信 《光纤与电缆及其应用技术》2001,(1):7-13,19
本文对国内外光缆的最新进展进行了综合分析。针对国内现状,对大芯数光缆、接入网用光缆、ADSS光缆提出了若干建议。同时,还对涉及光纤光缆测量方面的一些新技术作了简单的介绍。 相似文献
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Characteristics of lightning surges induced in telecommunication center in tropical area 总被引:1,自引:0,他引:1
Tominaga T. Kuwabara N. Kato J. Ramli A. Halim A. Ahmad H. 《Electromagnetic Compatibility, IEEE Transactions on》2003,45(1):82-91
The characteristics of lightning-induced surges in telecommunication equipment due to a direct lightning strike at a telecommunication center building or tower should be investigated to maintain the reliability of advanced telecommunication systems. In particular, investigations in tropical areas are important because these areas have many thunderstorm days. We observed lightning surges induced in a telecommunication building in Kuala Lumpur, Malaysia. The results show that the peak value occurrence frequency and waveforms of direct strike lightning surges were almost the same as those in a temperate area. The peak current relationships between the cables in the building and the tower legs indicate a strong correlation between the current at the tower legs, waveguide, power line, and outer and inner conductors of the coaxial cables. However, the peak value correlations between the tower leg currents and interface cable voltages were not strong. Based on the observation results, we obtained the correlation factors between the peak value at the observation point and the tower legs, and calculated the peak value at the interface cables as a function of the number of thunderstorm days. 相似文献
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赵继春 《光纤与电缆及其应用技术》2014,(2):40-45
从光缆的结构入手,分析了直埋光缆遭受雷击的原因,并进行了直埋光缆防雷的安全距离测算,最后提出了智慧小区直埋光缆经济可行的防雷解决方案。工程实践证明该解决方案取得了一定的效果。 相似文献
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Optical fibers are increasingly in use for overhead transmission lines. Optical fiber cables for overhead transmission lines can be classified into three types; composite type, winding type, and self-supporting type. For the composite type, an FRP-covered optical fiber unit is suitable because of its good thermal and mechanical characteristics. Winding-type fiber cable is least expensive to install on existing overhead transmission lines. A dc arc test showed that the winding type can be applied to a ground wire because of its resistance to lightning. The winding type was applied to the ground wire of a 275-kV line, using a remote-controlled winding machine. 相似文献
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Nellen P.M. Bronnimann R. Held M. Sennhauser U. 《Lightwave Technology, Journal of》2004,22(8):1848-1855
Physical and technical limits become important when trying to increase data transfer rates to tens of gigabits and higher for already installed optical cables. Polarization-mode dispersion (PMD) is one of the crucial transmission constraints, especially for aerial cables exposed to environmental stresses. Optical fibers in the laboratory and three aerial optical fiber cable links across the Swiss alps were characterized with respect to PMD. Long-term measurement results are correlated to weather data along the cables, and predictions regarding line availability are made. 相似文献
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文中从电信企业村村通基站的实际出发,结合雷击产生原因,探讨基站引入雷害的主要途径,着重讨论村村通基站防雷工程的主要措施以及在材村通基站工程建设中雷害防护的设计方法。 相似文献
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摘要:论述了高山发射台在防雷方面采取的综合防雷技术措施,光缆在信号防雷方面的优点以及使用避雷针弊大于利。 相似文献