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在架空电力线路的设计中,线路的档距l在滿足技术要求的前提下,还应等于或接近其经济档距l_(jj),以达到年运营费最低的目的。但l_(jj)多大合适?究竟用多大的档距l,电杆投资最少?下面以裸铝绞线LJ-16导线为例,应用“优选法”求出其每公里投资最少的档距l_(ts)。一、求导线的弛度已知: 1. 裸铝绞线LJ-16,导线采用水平排列。 2. 钢筋混凝土电杆。 3. 电杆在中等土壤中固定。 4. Ⅶ级计算气象区(本计算气象区是为便于计算而定,当导线与避雷线复冰,风速
In the design of overhead power lines, the span of the line l should meet or close to its economy span l_ (jj) under the premise of meeting the technical requirements so as to achieve the lowest annual operating expense. But how much l_ (jj) suitable? How much the use of stalls l, the minimum investment pole? Below the bare aluminum wire LJ-16 wire, for example, using the “preferred method” to find the least investment per kilometer stalls l_ ( ts). First, to find the Chi Chi known: 1. Bare aluminum wire LJ-16, the wire arranged horizontally. 2. Reinforced concrete poles. 3. Electric pole fixed in medium soil. 4. Ⅶ level computing meteorological area (the calculation of the meteorological area is for easy calculation, when the conductor and the lightning line ice, wind speed