A field grading composite body includes a polymeric matrix and a particulate filler distributed within the polymeric matrix. Particles of the particulate filler include a core formed from a semiconductor material, an oxide mixed layer deposited on the core, and conducting oxide layer. The conducting oxide layer deposited on the oxide mixed layer to provide an electrical percolation path through the polymeric matrix triggered by strength of an electric field extending through the field composite body. Conductors and methods of making field grading composite bodies for conductors are also described.

A connector part of a connector unit with a male part and a female part, has at least one electrically conductive layer with at least one end region being electrically stressed after a mating process of the male part and the female part. To minimize electrical stress concentrations, the connector part has at least one stress control device for reducing electrical stress at the at least one end region.

A connector part of a connector unit with a male part and a female part, has at least one electrically conductive layer with at least one end region being electrically stressed after a mating process of the male part and the female part. To minimize electrical stress concentrations, the connector part has at least one stress control device for reducing electrical stress at the at least one end region.

Provided are devices, methods and systems. A cover system may include a unitary cold shrinkable, tubular, elastomeric cover sleeve defining a cover sleeve through passage that is configured to receive the electrical cable. The cover sleeve may include a first type of stress control element and a second type of stress control element that is different from the first type of stress control element. A holdout maintains the cover sleeve in an expanded state in which the cover sleeve is elastically expanded and when removed, permits the cover sleeve to radially contract to a contracted state about the electrical cable. The first type of stress control element includes a geometric stress cone that includes an electrically conductive and/or semiconductive portion that is configured to conductively engage a semiconductor layer of the electrical cable. The second type of stress control element includes a high-K stress relief element.

An electrical penetrator assembly is shown, configured to feed electrical voltage and current through a wall separating a first volume and a second volume, which may have different pressure and/or may be filled with different fluids. The connector comprises a wall or partition having a through opening. An electrical conductor surrounded by a tubular insulator body passes the opening through the wall. A conductive or semi-conductive coating is arranged on the exterior of the insulator body, the coating surrounding the insulator body for a portion of its length, the coating in electrical contact with the wall, wherein the coated portion of the insulator body is shaped to displace the electric field around the conductor away from the wall and reduce the electric field strength around the insulator body by increasing the electric field strength inside the insulator body.

An electrical penetrator assembly is shown, configured to feed electrical voltage and current through a wall separating a first volume and a second volume, which may have different pressure and/or may be filled with different fluids. The connector comprises a wall or partition having a through opening. An electrical conductor surrounded by a tubular insulator body passes the opening through the wall. A conductive or semi-conductive coating is arranged on the exterior of the insulator body, the coating surrounding the insulator body for a portion of its length, the coating in electrical contact with the wall, wherein the coated portion of the insulator body is shaped to displace the electric field around the conductor away from the wall and reduce the electric field strength around the insulator body by increasing the electric field strength inside the insulator body.

A cable termination including a cable terminal and a cable joint assembly. The cable terminal includes: a terminal conductor; a monitoring device including a capacitive voltage sensor around the terminal conductor; and an electrically insulating body fitted around the terminal conductor, including a bell-shaped end portion in which the voltage sensor is at least partially embedded. The cable terminal alternatively includes: a terminal conductor; a monitoring device including a capacitive voltage sensor around the terminal conductor; and an electrically insulating body fitted around the terminal conductor, including a bell-shaped end portion in which the voltage sensor is at least partially embedded and a stem end portion, the terminal conductor extending beyond the stem end portion.

A cable termination including a cable terminal and a cable joint assembly. The cable terminal includes: a terminal conductor; a monitoring device including a capacitive voltage sensor around the terminal conductor; and an electrically insulating body fitted around the terminal conductor, including a bell-shaped end portion in which the voltage sensor is at least partially embedded. The cable terminal alternatively includes: a terminal conductor; a monitoring device including a capacitive voltage sensor around the terminal conductor; and an electrically insulating body fitted around the terminal conductor, including a bell-shaped end portion in which the voltage sensor is at least partially embedded and a stem end portion, the terminal conductor extending beyond the stem end portion.

A termination for electrical cables may include: an outer insulation tubular body having a longitudinal axis; a conductive rod within the body; an elastomeric sleeve within the body and extending about an end portion of the rod; a connecting device within the sleeve, wherein the device is mechanically and electrically connected to the rod and is configured to mechanically and electrically connect to an electrical cable; a conductive tubular element within the body, configured to electrically connect to ground; a semi-conductive element within the tubular element and partially extending inside the sleeve on an opposite side to the rod with respect to the device; and at least one elastic conductive element radially interposed between, and in contact with, the tubular element and semi-conductive element, the at least one elastic conductive element configured to exert elastic force onto the semi-conductive element along at least one radial direction toward the axis.

A termination for electrical cables may include: an outer insulation tubular body having a longitudinal axis; a conductive rod within the body; an elastomeric sleeve within the body and extending about an end portion of the rod; a connecting device within the sleeve, wherein the device is mechanically and electrically connected to the rod and is configured to mechanically and electrically connect to an electrical cable; a conductive tubular element within the body, configured to electrically connect to ground; a semi-conductive element within the tubular element and partially extending inside the sleeve on an opposite side to the rod with respect to the device; and at least one elastic conductive element radially interposed between, and in contact with, the tubular element and semi-conductive element, the at least one elastic conductive element configured to exert elastic force onto the semi-conductive element along at least one radial direction toward the axis.