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杨立军 《光纤与电缆及其应用技术》2023,(2):5-9
为满足不断增长的大容量、高电压、远距离输电线路建设需求,避免普通钢芯铝绞线导线在线路运行中出现的问题,研制了一种新型高导高强度耐热铝合金导线。该导线采用新型高导高强度耐热铝合金材料,协同提高导线的导电率、抗拉强度、耐热性;采用涂油特高强度镀锌钢芯和高导高强度耐热铝合金圆线、型线同心绞合而成的特殊结构,有效提高导线节能效果,确保导线更适用于长距离输电线路建设;采用涂油钢芯及导线外层型线紧密结构,有效提高导线防腐蚀性能,确保导线更适用于沿海或重工业地区的运行环境;采用光滑型线结构的外层铝股,降低导线风荷载及覆冰荷载,有效提高线路运行安全可靠性。该导线的施工方法与普通钢芯铝绞线基本一致且性能更优异,满足了我国电力行业工程应用需求,应用前景广阔。 相似文献
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随着±800kV特高压直流输电线路工程的输送容量由目前的8000MW提升至10000MW,以及±1100kV的开工建设建设,1250mm2导线将得到普遍应用,对架线施工中的一个重要环节-紧线及开断施工的工艺提出了新的要求.本文针对1250mm2大截面导线提出一种新的紧线工艺,并通过工程实践应用,取得了良好的效益. 相似文献
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为了保证输电线路的正常运行,及时对输电线断股的检测具有重要意义,本文将图像处理技术应用到在线监测输电线断股故障中,通过对采集的输电线图像进行去噪、阈值分割和边缘提取获取输电线边缘轮廓,然后建立数学模型进行分析,最后计算出断股线上边缘与输电线下边缘的最大垂直距离。试验结果表明,该方法操作方便、误差较小,可为输电线路检修提供宝贵的数据依据。 相似文献
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在高压输电线路的设计过程中,如何选择正确的导线非常关键,导线的性能和质量会影响线路的传输性能、输送容量以及经济指标,因此导线的选择会直接影响电力企业的成本。在整个电力工程建设过程中,输电线路架线工程的成本较高,而导线的选择也会直接影响整个工程项目的建设费用以及后续的运行成本。因此,在输电线路的设计过程中,需要认真地比对各种导线。基于此,文中简单介绍了导线选型以及节能导线的特性,并探讨了输电线路设计过程中选择节能导线时的注意事项,最后提出了节能导线的设计要点。 相似文献
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OTDR in optical transmission systems using Er-doped fiber amplifiers containing optical circulators 总被引:1,自引:0,他引:1
Y. Sato K. Aoyama 《Photonics Technology Letters, IEEE》1991,3(11):1001-1003
Fault location in optical amplifier transmission systems is described. Optical time-domain reflectometry (OTDR) cannot be used for an optical transmission line containing traditional Er-doped fiber amplifiers (EDFAs) because they contain optical isolators. The authors propose an OTDR scheme that uses new EDFAs containing optical circulators and return transmission lines. The new EDFAs support both OTDR and digital signal transmission. A 280.9 km transmission line containing three of the proposed EDFAs was constructed and tested. Experimental results demonstrated the feasibility of OTDR fault location and 1.8-Gb/s digital signal transmission.<> 相似文献
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A new method is studied which can automatically identify faults between an optical line and the transmission equipment on the subscriber side. This method employs a 1.3/1.55-μm-WDM dichroic reflective optical filter and a 1.55-μm-band optical time-domain reflectometer (OTDR). The filter is inserted between the optical line and the transmission equipment. The level and distance of reflection from the filter are measured with a 1.55-μm-band OTDR from the central office in this fault identification method. The required characteristics and structural design method for the filter are discussed. A prototype of the filter achieves the target characteristics and reliability. System evaluation experiments were carried out, and the possibility of 100% fault identification was confirmed as a result of accuracy tests in the field 相似文献
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Optical time domain reflectometry (OTDR) in an optical transmission line containing in-line Er-doped fiber amplifiers is investigated. The proposed Er-doped fiber amplifiers are based on optical circulators, which support both OTDR and digital signal transmission. The measurable limit of OTDR fault location in optical transmission lines containing in-line amplifiers is discussed. Fault location and 1.8-Gb/s digital signal transmission are demonstrated in a 316.9 km, optical transmission line constructed with three in-line Er-doped fiber amplifiers 相似文献
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光缆网迁改、割接调整后,传统的OTDR和在线监测方案无法准确描述光缆的距离信息并精准监测定位。提出了一种基于DAS技术的新型光缆巡线分析方案,该方案结合GIS系统、NFC标签、在线监测等技术,能实现对光缆传输管线的精确化、数据结构化、智能化的实时监测监控,保障光纤通信的安全运行。 相似文献
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目前,光缆作为城市轨道交通系统之中的关键传输介质,其本身的安全性会直接影响轨道交通的运营安全,这也就突出了光缆测试的重要性。而在光缆工程施工及线路维护工作开展过程中,OTDR(光时域反射仪)作为必不可缺的一个测试仪器,能将故障点位置迅速发现并确定,同时可对障碍性质及类别准确判定,从而提供可靠的数据,从而在分析光纤特性参数之中加以使用。基于此,在分析OTDR工作原理、测试方式及主要参数的基础上,剖析了测试中可能出现的误差,并提出了几点规避方法,以供参考。 相似文献
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This paper proposes a new modulation format for optical time domain reflectometry (OTDR) to eliminate optical surge and improve OTDR performance in optical amplifier submarine transmission systems. The modulation format, FSK-ASK, uses a short high-power probe pulse and a long dummy pulse. Thanks to the slow gain dynamics of erbium-doped fiber amplifiers, both pulses experience an identical gain, equal to the loss of a span, so that the probe pulse maintains its high power and does not develop into an optical surge. Fault location experiments verify a theoretical prediction that FSK-ASK improves the signal-to-noise ratio (SNR) of OTDR by an amount as large as the power ratio of the probe to dummy signal. They also confirm the elimination of the optical surge caused by conventional OTDR using a solitary probe pulse. An FSK-ASK OTDR is applied in a commercial submarine amplifier transmission system which has a total transmission length of 890 km and a repeater spacing of 90 km. These field trial results show that subtle fiber anomalies can be located, with a spatial resolution of 1 km, along the entire length of the amplifier transmission system from a terminal end 相似文献
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The use of optical time-domain reflectometry (OTDR) on long-span fiber transmission systems containing in-line optical amplifiers is discussed. Having identified the specific requirements for OTDR equipment, measurements were carried out on systems of up to 300 km in length, containing three semiconductor laser amplifiers. The results demonstrate that OTDR can be used not only for fault location on fiber links several hundred kilometers in length but also as an alternative to standard system supervisory techniques, thus providing the potential for minimizing the hardware in the optical amplifier stages of future long-span fiber optic transmission systems 相似文献
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