带有阻尼金具的紧凑型分裂导线建模与抗振分析

摘要

Compared with normal transmission lines,the compact transmission lines have dominant attribution over both the line corridor area and transmission capacity.Small internal air insulation distance is the key attribute.To ensure its safe operation,it is necessary to install the internal fittings.Taking the fittings of 500 kV transmission line with 3 split conductors as the research object,a model of breeze vibration of the damping fittings is established.By using the calculation platform of multi-degrees of freedom dynamic model of multi-span line,the antivibration performance of damping fittings of 500 kV compact transmission line is analyzed and the effects of using damping fittings on the line tension and static sag are discussed.The results demonstrate that installing suitable internal fittings can effectively suppress the vibration of transmission line caused by breeze.Moreover,the impacts of installing the internal fittings on the transmission lines' tension and sag are both in an allowable range.%与常规线路相比,紧凑型线路在缩小线路走廊占地和提高输送容量方面具有明显的优势,其结构上最大的特点是相内空气绝缘距离小,为保证其运行安全,需要加装相内金具.以500 kV输电线路三分裂导线金具为研究对象,建立了阻尼金具微风振动模型,研究500 kV紧凑型线路在阻尼金具体系中的微风振动.采用输电导线多档自由度模型分析平台,对500 kV紧凑型线路中阻尼金具的抑舞性能,以及在微风作用力下加装金具对导线的静态张力和弧垂的影响进行了分析.结果表明,在输电线路上加适当的相内金具能够有效抑制微风激励下的导线振动,并且加装相内金具对导线张力、弧垂的影响都在合理范围内.