If diameter of the conductor is 0.1 cm, then what is the

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If diameter of the conductor is 0.1 cm, then what is the inductance of a 3φ line operating at 50 Hz and conductors are arranged as follows ?

1. 2.15 mH/km
2. 1.25 mH/km
3. 1.29 mH/km
4. 1.84 mH/km

Correct Option: D

r' =	0.7788 × 0.10	= 3.894 × 10^-4 m.
	2 × 100

D_eq = (3.2 × 3.2 × 6.4)1/3 m = 4.031 m
Inductance per km

= 2 × 10^-7 × 10³ In		4.031
		3.894 × 10^-4

= 1.848 mH/km