500 kV变电站格构式变电构架最优根开研究

OPTIMIZATION OF THE ROOT SPAN OF 500 KILOVOLT ANGLE LATTICE SUBSTATION TRUSS STRUCTURES

在500 k V变电构架的设计中,目前国内人字形构架柱和单钢管悬臂支架柱应用较为成熟,角钢格构式变电构架应用较少。在海外工程中,角钢运输具有较大优势。结合实际工程,以埃塞俄比亚某500 k V变电构架为实例,通过根开的有效组合,对21种不同根开的变电构架进行了全面的计算,以用钢量和混凝土用量为依据进行工程造价比较分析,得出了类似工程条件下的最优根开,以指导工程设计。当构架柱高约为30 m时,结合构架所处地理位置气候等条件,最优根开建议值为6.1 m×3.1 m,即长向根开约取为柱高的1/5,短向根开约取为柱高的1/10时,结构整体力学性能较好且最为经济。

In the design of 500 k V substation,the A-shaped and steel tube power-transformed frames have been widely applied in China,but the angle lattice substation frame applied rarely. In overseas projects,angle steels have an advantage of easy-transporting,compared with steel tube. Combined with practical engineering,an Ethiopia 500 k V substation frame was took as an example. Through the effective combination of the root,21 kinds of substation frame with different roots were calculated in detail. The comparative analysis of engineering cost based on the amount of steel and concrete was performed,so as to obtain the most economical root span for similar projects and guide the engineering design. When the frame column height was about 30 m,combined with the location of climate and other conditions,the recommended value of root span was6. 1 m × 3. 1 m. Therefore,when the longer root was about 1/5 column height and the short root was about 1/10 column height,the structure had better mechanical properties and the most economical.