共查询到19条相似文献,搜索用时 78 毫秒
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阐述了城市高压架空输电线路设计的特点,和经验,结合实际工程列举出一组城市举凑型线路的钢管杆型,并提出了城市电网发展的趋势。 相似文献
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本文介绍在超高压输电线路上利用相间绝缘连接缩小相导线间距的可能性,以及安装相间绝缘连接后冰,风荷载在线路各元件间再分配问题。并叙述各种相间绝缘连接的结构特性及设计安装要求。 相似文献
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目前,我国城网架空绝缘配电线路一般无可靠的防雷措施,雷击断线事故已有发生。国外,架空绝缘配电线路的使用已很成熟,防雷措施比较完善合理。本文分析了架空绝缘电线因雷击而断线的特点和我国架空绝缘配电线路的防雷现状,介绍了国外架空绝缘配电线路的一些防雷措施,对我国架空绝缘配电线路的防雷措施提出了一些建议。 相似文献
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南方联营电网500kV线路绝缘架空地线故障分析中国南方电力联营公司朱镜 南方联营电网现有500kV线路7条3373基1580.61km。两根绝缘架空地线有5种接地方式:a.良导体地线全线换位,在进出变电站两端接地(天平一回线);b.良导体地线不换位,... 相似文献
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20世纪 70年代后期绝缘导线开始用于中压架空线路。在取得成功的经验后 ,现已用于高压线路。芬兰的 NK电缆公司与电力部门合作 ,在 1 993年建立了一条 1 1 0 k V的试验线路 ,对赫尔辛基机场供电 ;并于 1 996年将绝缘导线用于一条城区的 1 1 0 k V线路与常规的裸导线作对比(该线 相似文献
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此文概要介绍了在城市110kV呆空线路中,通过采用先进技术,优化线路设计和方案论证,提出了减小线路走廓宽度,降低工程造价为目的的城市小型化线路。该小型化线路目前正在实际工程中推广试用。 相似文献
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特高压线路外绝缘设计软件的污耐压算法 总被引:3,自引:2,他引:1
随着输电架空线路的电压等级不断提高,外绝缘设计成为建设特高压工程的关键问题。为了开发出一套功能完善的特高压输电线路外绝缘设计软件,研究了外绝缘设计方法并转化成可行的软件算法。在绝缘子污耐压特性研究的基础上,重点研究了污耐压法作为一种算法在进行外绝缘设计时所需考虑的问题,主要是盐密、灰密、污秽不均匀以及海拔等多因素对绝缘子闪络电压的影响和修正问题,并探讨了污耐压法的计算步骤,确定了污耐压法作为一种算法进行外绝缘设计的规则以及具体的实现过程。 相似文献
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简要叙述了城市架空电力线下地改造工作中存在的问题,并针对相关问题提出了多个架空线下地改造方案,归纳比较了不同架空线下地改造方案的优劣,最后就架空线下地改造工作中有关方案和设备安装等提出了一些建议。 相似文献
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Li Yongwei Yuan Jun Zhao Quanjiang Cao Yujie Chen Haibo.China Power Engineering Consulting Group Corporation .State Grid Corporation of China .Central Southern China Electric Power Design Institute .North China Electric Power Design Institute Co.Ltd. Wang Xingguo 《电气》2010,(3)
The UHVAC 1 000-kV transmission system is so far the one with the most advanced transmission technique applied and highest operation voltage.There are no guidelines or standards available for the design of 1 000-kV overhead transmission line in China.Study on key technologies and design schemes shall be carried out to ascertain the technical principles and construction standards for project construction,which are presented in this paper based on the Southeast Shanxi—Nanyang—Jingmen test and demonstration tr... 相似文献
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10 kV架空绝缘导线防雷措施 总被引:1,自引:0,他引:1
分析了架空绝缘导线的断线机理,阐述了绝缘导线断线理论计算方法,综合比较了各种防雷措施,重点介绍了线路过电压保护器及穿刺型防弧金具2种新的防雷措施,从目前国内部分城市实施情况看,这2种防雷措施应用效果较好。 相似文献
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Electrical power transmission is dominated by overhead line systems at present.This is mainly based on more than hundred years of experience of utilities in running overhead lines.Furthermore,overhead lines have proven their operational reliability and functional assurance.In the past,cables were used in distribution networks in urban areas for the most part with the exception of direct current submarine cables.New developments of high voltage XLPE cables make it possible to use this technology for EHV level applications in transmission networks.Within this paper,mixed network configurations,consisting of overhead lines and high voltage cables,are investigated.An exemplary EHV transmission line with a total length of about 100 km,which is quite typical for Central Europe,has been studied.Several different line combinations are discussed with varied rates between overhead line sections and cable sections length in practice.The length of the cable sections are ranging from several kilometers up to lengths of 100 km.In this paper the work focuses on the transient behavior of combined 400 kV overhead and cable lines during switching processes and lightning impacts.A number of calculations were carried out to get an overview of the transient stress in numerous network nodes along the transmission system.Numerical programs like ATP/EMTP have been used for these simulations.Peak values and wave shapes of the transient voltage stress have been evaluated,based on different systems and within possible combinations.In respect of the insulation coordination and transient stress at network nodes,the voltage-time trends are also analyzed.The combination of high voltage overhead and cable transmission systems,especially such with lengths of more than about 50 km,are making tightened and extended demands to the network design,to the operational management and of course to the network protection also.As an output of this investigations,the results might influence the strategy in running this new type of combined transmission systems. 相似文献