High voltage direct current cable termination apparatus

A direct current cable termination apparatus for terminating a high voltage direct current cable, the apparatus comprises

• a current-carrying device comprising a terminal portion of the direct current cable, the cable at least comprising an electrical conductor, a circumferential electrically insulating layer located outside of the electrical conductor, and a circumferential conductive shield located outside of the insulating layer and the electrical conductor,
• a housing comprising a tubular outer shell with an inner periphery the outer shell defining a longitudinal axis and being formed by an electrically insulating and polymer-containing material,
• the current-carrying device being adapted to extend in the axial direction of the outer shell,
• along at least a part of the axial extension of the current-carrying device the outer shell extends axially with a space between its inner periphery and the current-carrying device,
• the housing is adapted to the space from an atmosphere outside the outer shell, and the space is filled with an electrically insulating fluid
• the outer shell has a first end portion and a second end portion, the apparatus comprises at least one electric field control member located at a first axial range from the first end portion of the outer shell and at a second axial range from the second end portion of the outer shell, characterized in that
• the conductive shield terminates inside the outer shell,
• in that the electrical conductor of the terminal portion of the cable is terminated outside of the outer shell,
• in that the electrically insulating layer of the terminal portion of the cable is terminated outside of the outer shell,
• in that the electric field control member is provided inside the outer shell and in the proximity of the termination of the conductive shield,
• in that a first part of the terminal portion of the cable has the circumferential conductive shield, whereas a remainder part of the terminal portion of the cable has the conductive shield removed, the first and remainder parts being located inside the outer shell, and the first part being situated outside the first axial range, and
• in that the apparatus comprises at least one field grading material layer positioned around the current-carrying device, the at least one field grading material layer extending axially inside the outer shell and extending at least along the first axial range, and the at least one field grading material layer is electrically connected to the conductive shield of the terminal portion of the cable and electrically connected, indirectly or directly, to the electrical conductor outside of the outer shell.