4. Main electrical characteristics

4.1 Electric field

High- and extra-high-voltage power cables are generally either single-pole or three-pole with individual shielding. Under these conditions, the electric field E in the insulating jacket has only a radial component E _r , obtained by solving the equation ΔV = 0, where V is the voltage applied between the conductor and the screen.

E _r can be written as :

where A is a constant that can be calculated by :

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