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Nkt Hv Cables Ab

Radim Lichy

Jan Czyzewski

Victoria Maurer

Torbjörn Sörqvist

Torbjorn Sorqvist

Josip Batkovic

A high-voltage cable fitting, typically a cable end termination or a cable joint, includes coaxially arranged around an axis a rigid conical insulator, an electrically insulating, elastomeric stress-relief cone matching the rigid conical insulator through a conical interface and an axially aligned current path. The current path connects a conductor of the cable to a high-voltage current terminal arranged on top of the rigid conical insulator and provided for connection to a high-voltage component. The rigid conical insulator is configured as a condenser core and includes a plurality of electrically conductive field-grading layers, which are arranged concentrically around the axis, and a rigid polymeric matrix which embeds the field-grading layers. In order to keep the size of the cable fitting small and to enable the fitting to carry high rated continuous currents a section of the cable conductor, which is stripped off the insulation of the cable, extends from the conical interface to the high-voltage current terminal and forms the axially aligned current path, and the condenser core comprises an axially aligned tubular duct which receives the stripped-off section of the cable conductor and which passes two opposing front faces of the condenser core.

Cable fitting for connecting a high-voltage cable to a high-voltage component

A high-voltage cable fitting with a rigid core insulator that has a first conical outer surface extending concentrically about a longitudinal axis. An elastomeric stress relief element has a first conical inner surface is designed for mating the first conical outer surface at an interface. A rigid member is provided for pressurizing the elastomeric stress relief element at the interface. The stress relief element is pressed onto the rigid core insulator. The rigid member has at least one pressure enhancing portion extending circumferential about the longitudinal axis for causing an additional axial expansion stress in a sleeve portion of the stress relief element extending along the first conical outer surface of the core insulator in an assembled state of the cable fitting.

Cable fitting for connecting a high-voltage cable to a high-voltage component or another high-voltage cable

A device for controlling an electric field at a high voltage component including a resistive layer for field control, an insulating layer arranged on the resistive layer and a semi-conducting or conducting layer arranged on the insulating layer. The three layers meet at a triple point where the insulating layer ends. An interface between the resistive layer and the insulating layer makes in the triple point an angle to the semi-conducting or conducting layer of 60&#xb0;-120&#xb0;.

Device for electric field control

A device for expanding a tubular elastic body, the device comprises a rigid tube to be introduced into at least a part of the elastic body and keep the elastic body in an expanded state, and an expansion means adapted to expand the elastic body and arranged to be introduced into a first end of the rigid tube. The expansion means is adapted to be movable inside the rigid tube and when the expansion means is fully introduced in the rigid tube, the expansion means protrudes at a second end of the rigid tube and thereby forms a transition between the rigid tube and the expansion element. One end of the expansion means is provided with a radially resilient expansion element with a width decreasing in the introduction direction of the expansion means into the first end of the rigid tube.

Device for expanding a tubular elastic body

A connector for connecting a power cable with solid insulation to medium-voltage equipment comprising a connection device arranged in an angular housing. The connector comprises a screwable pin contact which is connected to the cable core. The device comprises a guide sleeve, fixed in the angular housing, with an extension made in the shape of a jaw, into which sleeve the cable core is inserted, and a clamping block, into which the pin contact is threaded. The inner end of the pin contact makes contact with the jaw such that, when tightening the pin contact, the cable core is squeezed between the clamping block and the jaw. The angular housing comprises an outer semiconducting layer, the end of which, connecting onto the cable, is capable of being folded up. The connector is removable fixed to the medium-voltage equipment with a clamping device which is arranged in one piece of resilient wire.

Growing community of inventors

Alingsås, Sweden

Radim Lichy