A 220 kV, 20 km long, 3-phase transmission line has the

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A 220 kV, 20 km long, 3-phase transmission line has the following A, B, C, D constants:
A = D = 0.96/∠3°, B = 55∠65∠ Ω/ phase, C = 0.05 D = 04 ∠80° S/phase. Its charging current per phase will be ________A

1. 10
  √3
2. 3
  √11
3. 11
  √3
4. 9
  √2

Correct Option: C

I_S = CV_r + D I_r
Here, V_r = 220/√3
Let I_r = 0,

∴ I_r = 0.05 ×	22	=	11	A
	√3		√3