A 12 kV, 50 Hz single core lead sheathed cable has the following data:
Conductor diameter: 2 cm
Length: 6 km
Internal diameter of the sheath: 5 cm
Resistivity of insulation: 1.3 × 1012Ω - m
Relative permittivity of insulation: 4.5
The insulation resistance and the capacitance respectively are –1
31.59 MΩ, 1.64 μF
2
31.59 MΩ, 0.273 nF
3
42.93 MΩ, 0.273 nF
4
32.93 MΩ, 0.273 nF