A 3-phase, 60Hz, 50km long, completely transposed transmission line is built using Drake conductor. Drake conductor has an outside diameter of 1.108 inches; stranding of 26/7 (Al/St), which yields a GMR for the conductor of 0.0375 feet. Resistance at 60-Hz for this conductor is 0.117 ?/mile. A horizontal tower configuration is used, with a phase spacing of 25 feet (25 feet between left and center phases, 25 feet between center and right, and hence 50 feet between left and right). Bundling is used, with 2 conductors per phase, spaced 1 foot apart. For reference ยต0 = 4? x 10-7 H/m and ?0 = 8.854 x 10-12 F/m.
a) Find the positive sequence inductance in H/m and inductive reactance in ?/km.
b) Find the capacitance to neutral in F/m and the admittance to neutral in S/km. Neglect the effect of the earth plane.
c) Since the line is 50km, we can make the short line approximation. Draw the short line ? equivalent circuit, labeling appropriate values.
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