共查询到20条相似文献,搜索用时 78 毫秒
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介绍了导线自阻尼特性,在对自阻尼条件下导线振动强度及防振效果评估分析的基础上,对2种1 250mm2大截面导线进行了防振锤布置方案研究,给出了防振锤安装位置的计算方法。通过对导线JL1/G3A-1 250/70和JL1/G2A-1 250/100的防振研究,在确保防振方案安全可靠基础上,结合防振试验计算结果并预留一定安全裕度,推荐出切实可行的特高压直流线路大截面导线防振锤布置方案:铰链式第一个防振锤距线夹出口2.08m(JL1/G3A-1 250/70)和2.16m(JL1/G2A-1 250/100),预绞式第一个防振锤距线夹出口2.28m(JL1/G3A-1 250/70)和2.26m(JL1/G2A-1 250/100),其他防振锤基于第一个防振锤的计算安装距离采取等距安装原则布置。 相似文献
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光纤复合架空地线的防振 总被引:1,自引:0,他引:1
对目前国内OPGW的防振形式进行了归纳,提出对OPGW微风振动和舞动的治理方案。在OPGW微风振动的治理方面,对于一般线路而言,通常采用防振锤或防振鞭,而对于大跨越线路则宜采用阻尼线和防振锤组合防振的方式。为了保证实际工程中所采用的防振方案的有效性,对防振锤的选型,安装位置,安装方向,防振鞭的消振效果,阻尼线和防振锤组合防振的消振效果,进行了试验室模拟试验,并对试验数据进行了分析。文章也对OPGW舞动的形态、影响因素及防舞动措施进行了介绍,并提出了适用于OPGW的防舞动措施。 相似文献
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为了分析安装防振锤的1000kV特高压架空输电线路的微风振动强度,研究了利用有别于传统能量平衡法(EBM)的有限元方法(FEM)分析微风振动的关键技术。该法基于能量等效原理,利用索单元模拟输电线;将输电线、防振锤磁滞阻尼等效成为粘滞阻尼,将风输入功率等效成为微风激励力作用于单元节点。根据振幅和曲率的关系推导了输电线动弯应变幅值沿输电线的分布规律。通过算例分析得出以下结果:未安装防振锤时,有限元分析结果与能量平衡法分析结果吻合较好;安装了防振锤的情况下,有限元法能够反映防振锤安装位置的差异和动力特性对防振效果的影响,分析结果较能量平衡法为大。所得结果可供特高压输电线微风防振设计和研究参考。 相似文献
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防振锤是架空线路中一种典型的防振装置,常用于抑制输电线的风致振动,减轻输电线的微动损伤.从防振锤的结构和力学性能两个方面的研究进行论述.首先根据防振锤的发展历程,介绍了国内外典型的防振锤,阐述了它们结构上的区别及各自的优缺点,并以Stockbridge型防振锤为例,解释了防振锤的防振机理;此外,简述了防振锤线夹和锤头结构优化的案例.然后对防振锤的力学模型和力学性能进行了说明,并按照理论推导、仿真分析、振动试验三种研究方法,总结了国内外有关防振锤力学性能方面的研究.最后根据国内外关于防振锤结构和力学性能的研究成果,对防振锤的结构改进及其他特性研究进行了展望. 相似文献
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结合湿法脱硫的运行特点,对原烟气挡板门、净烟气挡板门、旁路挡板门的结构、材料、配置以及运行方式进行了阐述,提出相应的建议。 相似文献
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针对某1 000MW汽轮机高中压缸轴承箱油档损坏和轴承振动增大的现象进行分析,认为轴承异常原因为油档积碳引起,提出采用新型节能保温材料,并将1号至4号油档改造为气密式油档,从而根本上解决油档处轴颈积碳、磨损问题。 相似文献
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Improvement of Three‐Phase Unbalance Due to Connection of Dispersed Generator by Damper Windings of Synchronous Generator 下载免费PDF全文
Junya Matsuki Hisao Taoka Yasuhiro Hayashi Shigeru Iwamoto Akihiro Daikoku 《Electrical Engineering in Japan》2014,186(1):43-50
It is well known in the numerical simulations of a synchronous generator that the damper winding contributes to suppressing three‐phase circuit unbalance in power systems. However, an experimental study has not been performed yet. In this paper, we verify experimentally the suppression of three‐phase unbalance by the damper windings. In order to simulate the three‐phase unbalance, a 470‐W dispersed generator of single‐phase two‐line type was connected to a three‐phase laboratory‐scale power system that included a 6‐kVA synchronous generator. We measured and analyzed line voltages and currents as well as damper bar currents both with and without the dispersed generator. The influence of damper windings on the unbalance of the three‐phase circuit was also investigated. The results show that the damper winding contributes to improving the three‐phase unbalance. © 2013 Wiley Periodicals, Inc. Electr Eng Jpn, 186(1): 43–50, 2014; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.22305 相似文献
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Susumu Maeda Hiroyuki Yamasita Haruyuki Kometani Kenji Shimohata Tatsuei Nomura Akifumi Izumi 《Electrical Engineering in Japan》2005,151(1):19-33
Superconducting generators have many advantages such as increasing generation efficiency and improving power system stability. In Japan, 70‐MW‐class superconducting generators have been developed through the national project “Electric Power Application of Superconducting Technologies (1988–1999).” In this paper, performance evaluation of the rotor damper structure for the 70‐MW‐class model generator is discussed. Double‐layered damper structure, which consists of a squirrel‐cage warm damper and a single‐layered cold damper, was set as the target. As the first step, basic electromagnetic and thermal performances were obtained. Consequently, it was proven that the damper structure had the performances to satisfy the requirements of the superconducting generators. Performances obtained from the experimental model, design of the 70‐MW model rotor, and evaluation by the verification tests are described in this paper. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 151(1): 19–33, 2005; Published online in Wiley InterScience ( www.interscience. wiley.com ). DOI 10.1002/eej.20025 相似文献
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With the recent development of power electronics technology, thyristor-controlled equipment has largely been introduced to the electric power system. These devices generate harmonics that cause voltage distortion and undesirable effects on the power system components. On the other hand, the damper windings of synchronous generators basically are designed to reduce harmonics as well as to damp out system oscillations. However, up to now, the effects of damper windings on harmonics have not been clarified fully in a quantitative way. In this paper, the results of experimental study on the harmonics reduction effect of damper windings have been presented. A specially designed 6-kVA generator was connected to an infinite-bus system to investigate the characteristics of damper windings. A new method to measure induced voltages between damper bars, damper bar currents and air-gap flux densities in the tested generator was established. By comparing these measurements with and without the presence of damper windings, the effect of damper windings was quantified. Thus the reduction effects of the damper windings on slot ripples and harmonics caused by armature current mmf were investigated and were made clearer than before by the proposed method. 相似文献