Patent ID: 7674979

Claim:
A synthetic material end for a DC electric cable comprising: a central conductor for putting under high voltage, and surrounded successively by an inner insulator; an outer semi-conductor; and a metal screen for connection to ground, in which the end of the cable is partially stripped by removing the outer semi-conductor and the metal screen, the synthetic material end that includes an outer insulating sleeve having a stress cone and including a field deflector made out of a semi conductive material, said synthetic material end further including a composite insert that is placed between said inner insulator and said outer insulating sleeve, said insert generally being in the form of a sheath surrounding said inner insulator over the partially-stripped portion of the cable, said insert being made up of a resistive portion of high resistivity, and of a semi-conductive portion of lower resistivity, the interface between said resistive and semi-conductive portions forming a deflector where the resistivity of said resistive portion of said insert is several orders of magnitude smaller than the resistivity of said inner insulator of said cable, the end of said resistive portion that is remote from the deflector being electrically connected to the central conductor, and the end of the semi-conductive portion that is remote from the deflector being electrically connected to the outer semi-conductor.