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

A high-voltage cable fitting, comprising:

• a rigid core insulator with a cavity for receiving a conductor, wherein the rigid core insulator has a first conical outer surface extending concentrically about a longitudinal axis defined by the columnar overall shape of the high-voltage cable fitting,
• an elastomeric stress relief element having a first conical inner surface designed for mating the first conical outer surface over a predefined length at an interface,
• a rigid member provided for pressurizing the elastomeric stress relief element at the interface, and the rigid member has at least one pressure enhancing portion extending circumferentially 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,
• wherein at a given annular zone on the interface a diameter of the first conical inner surface is smaller than a diameter of the first conical outer surface in an unassembled state of the high-voltage cable fitting, and that the stress relief element is pressed onto the rigid core insulator, and in that:
• the stress relief element is cup-shaped and has an opening formed by the first conical inner surface and a circumferential collar directed radially outwards and a first end face located at the entry of said opening, and in that the rigid member has an inner contour for receiving the stress relief element, wherein the pressure enhancing portion is located at the inner contour such that it engages with the collar such that an additional axial expansion stress in the sleeve portion of the stress relief element extending along the first conical outer surface of the core insulator is caused in an assembled state of the cable fitting, and the pressure enhancing portion has a horn-shaped cross-section extending circumferentially about the longitudinal axis.

A high-voltage cable fitting, comprising:

• a rigid core insulator with a cavity for receiving a conductor, wherein the rigid core insulator has a first conical outer surface extending concentrically about a longitudinal axis defined by the columnar overall shape of the high-voltage cable fitting,
• an elastomeric stress relief element having a first conical inner surface designed for mating the first conical outer surface over a predefined length at an interface,
• a rigid member provided for pressurizing the elastomeric stress relief element at the interface, and the rigid member has at least one pressure enhancing portion extending circumferentially 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,
• wherein at a given annular zone on the interface a diameter of the first conical inner surface is smaller than a diameter of the first conical outer surface in an unassembled state of the high-voltage cable fitting, and that the stress relief element is pressed onto the rigid core insulator, and in that:
• the rigid member has an inner contour that is directed towards the stress relief member, wherein the pressure enhancing portion comprises a plurality of stepped shoulders arranged at that inner contour at least in an area facing the first conical outer surface,
• wherein the plurality of stepped shoulders are inclined with respect to the longitudinal axis about an inclination angle,
• and in that the stress relief element is cup-shaped having an opening formed by the first conical inner surface, and a first end face located at the entry of said opening, wherein the stress relief element has an outer contour that is directed towards the rigid member and has a plurality of counter-shoulders for interacting with the stepped shoulders of the rigid member such that an additional axial expansion stress in the sleeve portion of the stress relief element is caused in an assembled state of the cable fitting.

A high-voltage cable fitting, comprising:

• a rigid core insulator with a cavity for receiving a conductor, wherein the rigid core insulator has a first conical outer surface extending concentrically about a longitudinal axis defined by the columnar overall shape of the high-voltage cable fitting,
• an elastomeric stress relief element having a first conical inner surface designed for mating the first conical outer surface over a predefined length at an interface,
• a rigid member provided for pressurizing the elastomeric stress relief element at the interface, and the rigid member has at least one pressure enhancing portion extending circumferentially 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,
• wherein at a given annular zone on the interface a diameter of the first conical inner surface is smaller than a diameter of the first conical outer surface in an unassembled state of the high-voltage cable fitting, and that the stress relief element is pressed onto the rigid core insulator, and in that:
• the pressure enhancing portion is a sleeve-shaped pressure body provided between the stress relief member and the rigid member, wherein said pressure body has a second conical inner surface that is matching a second conical outer surface of the stress relief element at least in an area facing the first conical outer surface, and in that a compression system is provided between an axial end face of the pressure body and the rigid member for exerting an axial force on the pressure body in an assembled state of the cable fitting such that an additional axial expansion stress in the sleeve portion of the stress relief element is caused in an assembled state of the cable fitting.