A three-phase double circuit pylon is shown below. Each phase is bundled by 4 sub-conductors with conductor spacing d = 45 cm. The sub-conductor is stranded by 7 wires with a radius of each wire of 2.2 cm (see figure 1). Figure 2 shows the phase arrangement for the single circuit and double circuit, respectively.

Calculate the inductance and capacitance per unit length for figure 2(a) and figure 2(b), respectively, compare the results, and comment on these results.

 

phase b phain G 10m prese phase A 10m Figure 2 (a) Double circuit pylon pe 16m 24m 18m Figure 1 Phase B 10 m 10 m 000000 10 m Phase A Phase C 10 m 10 m Figure 2 (b) Single circuit pylon