380V三相架空(kong)輸(shu)(shu)電(dian)(dian)(dian)(dian)線(xian)(xian)路(lu)(lu)電(dian)(dian)(dian)(dian)壓損失(shi)百分數(shu)的計算式中(zhong)r?一(yi)每(mei)千(qian)米(mi)輸(shu)(shu)電(dian)(dian)(dian)(dian)線(xian)(xian)路(lu)(lu)長度的電(dian)(dian)(dian)(dian)阻，Ω/km;X?一(yi)每(mei)千(qian)米(mi)輸(shu)(shu)電(dian)(dian)(dian)(dian)線(xian)(xian)路(lu)(lu)長度的感抗，Ω/km;Un一(yi)輸(shu)(shu)電(dian)(dian)(dian)(dian)線(xian)(xian)路(lu)(lu)額定電(dian)(dian)(dian)(dian)壓，kV;P一(yi)輸(shu)(shu)電(dian)(dian)(dian)(dian)線(xian)(xian)路(lu)(lu)輸(shu)(shu)送的有功功率，kW;tanφ一(yi)功率因(yin)數(shu)cosp對應的正切值;L一(yi)輸(shu)(shu)電(dian)(dian)(dian)(dian)線(xian)(xian)路(lu)(lu)長度，km。

式中Un--- 線(xian)路額定電壓(ya)，取0. 38kV;I一(yi)(yi)線(xian)路電流，A;L一(yi)(yi)導線(xian)長(chang)度， km;r?，X?一(yi)(yi)線(xian)路單(dan)位長(chang)度的(de)(de)電阻(zu)和電感，ΩQ/km;ΔU? %一(yi)(yi)線(xian)路每安●千(qian)米的(de)(de)電壓(ya)損失百分(fen)數(shu)。