共查询到19条相似文献,搜索用时 156 毫秒
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针对鸟海电业局220kV架空地线提升作业无专用工具,作业方法操作难度大,安全性差、工效低、劳动强度高的现状,结合线路实际情况研制了220kV直线杆塔架空地线提升器。提高了输电线路检修水平。 相似文献
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万宏伟 《广东输电与变电技术》2008,(3):37-41
复合地线光缆(OPGW)的施工方法原则上与传统架空电力线路地线的安装方式一致,但OPGW毕竟有别于普通的架空地线,有其独特的结构性能特点,因此在具体施工时,在许多方面又有别于传统架空地线的施工.为此,作者结合多年的施工经验谈谈OPGW的施工. 相似文献
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用EMTP仿真计算了淮南~皖南一浙北~沪西1000 kV交流同塔双回线路架空地线感应电压和感应电流,并对架空地线上的感应电压、电流的影响因素进行分析.具体仿真计算得出大、小运行方式下不同运行状况的特高压同塔双回线路架空地线的感应电压、电流的幅值.分别仿真分析了相序排列、地导线间距、线路负荷以及绝缘地线分段长度等因素对架空地线感应电压、电流的影响.研究结论可为特高压输电线路检修与带电作业,以及感应电压、电流的利用等方面的工作提供借鉴. 相似文献
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传统架空地线短距离提升通用装置直接对横担锁定组件结构进行设计,未对架空地线提升装置难点进行分析,造成传统装置作业效率低,为此对架空地线短距离提升通用装置进行研制。分析架空地线提升装置难点,在分析难点的基础上,针对铁塔顶部稳定固定提升装置,提出横担锁定和提升丝杠的解决方案,并对其进行实际应用测试,测试结果表明该提升通用装置具有高效性的特点,更具优越性。 相似文献
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万宏伟 《广东输电与变电技术》2008,(5):37-41
复合地线光缆(OPGW)的施工方法原则上与传统架空电力线路地线的安装方式一致,但OPGW毕竟有别于普通的架空地线,有其独特的结构性能特点,因此在具体施工时,在许多方面又有别于传统架空地线的施工。为此,作者结合多年的施工经验谈谈OPGW的施工。 相似文献
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输电线路架空地线节能接地技术 总被引:1,自引:0,他引:1
架空地线与导线之间存在电磁感应,由此带来架空地线电能损耗问题。对架空地线节能接地技术进行系统研究,提出架空地线感应电压的控制原则,区分单回、多回线路提出架空地线节能接地方式以及地线分段节距计算公式。提出地线绝缘子及间隙选型要求,给出标准大气压以及不同海拔、温度、湿度条件下间隙距离参数,对冰区绝缘子还提出了覆冰绝缘配置和直流融冰技术要求。提出多种光纤复合地线(optical fiber composite overhead ground wire, OPGW)节能接续方案,并介绍了OPGW常用金具。提出的架空地线节能接地技术已在广东电网冰区、非冰区线路中实际应用。 相似文献
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The role of an overhead ground wire on the generation for lightning-induced voltage on a multiconductor line associated with a vertical return-stroke channel is studied based on numerical calculation. The induced voltage is calculated by a method in which the tangential component of the electric field to the wire is looked upon as an inducing source. The analyzed multiconductor line consists of three phase wires and an overhead ground wire having one or two earthing points. The influence of the overhead ground wire on the induced voltage is dependent on the direction of a return stroke, as well as the ground conductivity. When a return stroke is on the side of a power distribution line, the induced voltage decreases with a decrease in the earthing resistance of the overhead ground wire, irrespective of the ground conductivity. When a return stroke is close to an end of a distribution line, the influence of the overhead ground wire is dependent on the ground conductivity. In this case, the voltage induced on overhead wires over lossy ground sometimes increases with the presence of an overhead ground wire having only one earthing point. This effect can be avoided by adding earthing points to the overhead ground wire. © 1998 Scripta Technica. Electr Eng Jpn, 121(4): 18–27, 1997 相似文献
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验证超高压输电线路架空地线直流融冰的可行性。以500 kV桂林变电站融冰装置为例,确定超高压输电线路架空地线融冰接线方式,在此基础上介绍线路普通地线及OPGW地线融冰的仿真建模方式和特点。通过实际应用验证了超高压输电线路普通地线及OPGW地线直流融冰的可行性。在超高压输电线路架空地线融冰试验过程中,发现地线放电间隙过小导致直流融冰装置闭锁,架空地线融冰接线方式转变困难,普通地线和OPGW地线因过电流被烧断等问题。针对以上问题提出了解决办法。 相似文献
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随着电网规模的扩大、输电线路长度的增加,架空地线电能损耗问题日益突出.采用现场测量和仿真计算方法对架空地线电能损耗特性进行研究,得到110 kV~500 kV典型单、双回线路电能损耗定量数据及感应电流、电能损耗特性规律.在此基础上提出架空地线单点接地,地线分段、换位及导地线配合换位等多种节能接地措施,并在广东电网开展节能工程应用.分别在广东电网、南方电网实施架空地线节能工程的投资成本和经济效益表明,架空地线节能技术可大幅降低架空输电线路运行损耗,具有巨大的经济、社会效益,对于实施电网节能降耗、推进绿色电网建设具有重要意义. 相似文献
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In order to calculate the fault current distribution when a single‐phase to ground fault occurs in a transmission system with asymmetric parameters, this paper proposes an improvement on the traditional double‐side elimination method based on the phase component model. The improved double‐elimination method widens the range of the original method to the situation of multiple overhead ground wires and double power sources at both terminals. From the fault point, it divides the system into the left and right networks. Taking the left network as an example, the equations of all spans are formed. Then, the forward–backward recursive process of the theory is demonstrated. By optimizing the matrix calculation process, the calculation model for computers is formed, which can easily calculate the fault current on phase wires and overhead ground wires when a single‐phase to ground fault occurs. By comparing the results from this theory and the results from the EMTP simulation software, the correctness of the theory is established. Furthermore, in this paper we give a detailed discussion on the influence of tower grounding resistance and overhead ground wire operation mode on the fault current distribution. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献