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What is the inductance per km per phase of a single cir cuit 460 kV line using two bundle conductors per phase as shown in the figure, if diameter of each conductor is 5 cm?
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- 0.24 mH/km/ph
- 0.76 mH/km/ph
- 0.89 mH/km/ph
- 0.90 mH/km/ph
Correct Option: C
Let effect of transposition is negligibly small.
Ds = (0.025 × 0.8 × 0.7788)1/2 = 0.124 m
Dm = (8.5 × 17 × 8.5)1/3 = 10.7 m
Inductance per km/phase
| = 2 × 10-7 × 103 In |  |  | mH/km/ph | |
| 0.124 |
= 2 × 10-4 × 4.45 mH/km/phase
= 8.90 × 10-4 mH/k m/phase
