A 3−ϕ, 220 kV line operating at 50 Hz and conductors arranged as shown below, the conductor radius is 0.40 cm. The charging current per km is __________A
0.45
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Solution
The correct option is A 0.45 The radius of conductor = 0.4 cm
The mutual GMD of conductor, Dm=3√80×40×40
= 50.3968 = 50.4 cm
Capacitance per phase per meter =2πϵ0ın50.40.4F/m =2π×8.85×10−124.836=1.15×10−11F/m =1.15×10−8F/km
The charging current =VωC=220√3×1000×1.15×2π×50×10−8
= 0.45889 A/km.