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在设计电力线路选择导线截面时,对于35千伏以上电压等级,线路的导线截面主要按经济电流密度决定。对于35千伏及35千伏以下电压等级的线路,导线的截面主要由电压损失决定,对于这种电压等级的电力线路在选择导线截面时,通常利用公式△u=△u_0·P·L来计算。公式中△u为电压降百分数;△u_0为某种导线的单位电压降系数;P为线路的输送功率;L为线路的长度。然而利用这个公式来选择导线往往需要几次试算。因为在计算时要试选某种导线,再利用
In the design of power line selection wire cross-section, for 35 kV and above voltage levels, the wire cross-section of the line mainly by economic current density. For 35 kV and 35 kV voltage lines below the line cross-section of the wire is mainly determined by the voltage loss for this voltage level of the power line in the choice of wire cross-section, usually using the formula △ u = △ u_0 · P · L Calculate. △ u is the voltage drop percentage in the formula; Δu_0 is the unit voltage drop coefficient of a kind of lead; P is the transmission power of the line; L is the length of the line. However, using this formula to select the wire often requires several trial calculations. Because in the calculation of a certain election when the test wire, re-use