有一台电动机,每相电感量0.078H,电阻5Ω,现接在低压380V工频电源上.求电动机三角形接时线电流和有功功率

1个回答

  • 每相线圈电抗:X = ω * L = 2 * π * f * L = 2 * 3.14 * 50 * 0.078 = 24.5 Ω

    电阻:R = 5 Ω

    阻抗:Z = ( R * R + X * X)^ 0.5 = 25 Ω

    三角形连接,相电压 U = 线电压 = 380

    每相电流:I1 = U / Z = 380 / 25 = 15.2 A

    线电流:I = √3 * I1 = 1.732 * 15.2 = 26.33 A

    功率因数角:P = 3 * I1 * I1 * R = 3 * 15.2 * 15.2 * 5 = 3465.6 w