Power cable termination device for gas-insulated switchgear

A power cable termination device for a high voltage direct current gas-insulated switchgear, the power cable termination device comprising:

• an outer housing made of an electrically conducting material, the outer housing being fixedly connectable at a first end thereof to the high-voltage direct current gas-insulated switchgear,
• a terminal portion of a power cable, the power cable having an electrical conductor, an electrically insulating layer circumferentially surrounding the electrical conductor, and a conductive shield circumferentially surrounding the insulating layer and the electrical conductor, wherein the conductive shield is stripped off along a first part of the power cable,
• an electric field grading system having a resistive field grading material layer, which is made of a non-linear resistive field grading material, arranged circumferentially around the power cable such as to extend axially at least along a part of the electrically insulating layer and such as to cover the edge of the conductive shield where the conductive shield is terminated, the resistive field grading material layer being in electrical contact therewith,
• a connection device connectable to the gas-insulated switchgear and arranged to provide mechanical support and electrical contact with the gas-insulated switchgear, and
• an inner shell made of an electrically insulating material and fastened at a first end thereof to the connection device and at a second end thereof to a power cable receiving part of the outer housing.

A power cable termination device for a high voltage direct current gas-insulated switchgear, the power cable termination device comprising:

• an outer housing made of an electrically conducting material, the outer housing being fixedly connectable at a first end thereof to the high-voltage direct current gas-insulated switchgear,
• a terminal portion of a power cable, the power cable comprising an electrical conductor, an electrically insulating layer circumferentially surrounding the electrical conductor, and a conductive shield circumferentially surrounding the insulating layer and the electrical conductor, wherein the conductive shield is stripped off along a first part of the power cable,
• an electric field grading system comprising a resistive field grading material layer, which is made of a non-linear resistive field grading material, arranged circumferentially around the power cable such as to extend axially at least along a part of the electrically insulating layer and such as to cover the edge of the conductive shield where the conductive shield is terminated, the resistive field grading material layer being in electrical contact therewith, and
• a connection device connectable to the gas-insulated switchgear and arranged to provide mechanical support and electrical contact with the gas-insulated switchgear,
• wherein the electric field grading system comprises a conducting electrode fastened to a second end of the outer housing circumferentially surrounding the power cable and arranged a distance from the resistive field grading material layer.

A high-voltage direct current gas-insulated switchgear system comprising a high-voltage direct current gas-insulated switchgear and a power cable termination device including:

• an outer housing made of an electrically conducting material, the outer housing being fixedly connectable at a first end thereof to the high-voltage direct current gas-insulated switchgear,
• a terminal portion of a power cable, the power cable comprising an electrical conductor, an electrically insulating layer circumferentially surrounding the electrical conductor, and a conductive shield circumferentially surrounding the insulating layer and the electrical conductor, wherein the conductive shield is stripped off along a first part of the power cable,
• an electric field grading system comprising a resistive field grading material layer, which is made of a non-linear resistive field grading material, arranged circumferentially around the power cable such as to extend axially at least along a part of the electrically insulating layer and such as to cover the edge of the conductive shield where the conductive shield is terminated, the resistive field grading material layer being in electrical contact therewith, and
• a connection device connectable to the gas-insulated switchgear and arranged to provide mechanical support and electrical contact with the gas-insulated switchgear,
• wherein the outer housing is filled with an insulating medium in the form of a gas.