A field grading member includes an insulating body extending along a regulation axis and a conductive body. The conductive body is encapsulated within the insulating body and defines a conductive network therein to regulate an electric field within an underlying insulator from current flowing through a conductor along the regulation axis. Cables and methods of regulating electric field within cables are also described.

The present invention relates to a cable termination system comprising: a power cable sequentially comprising a first length of exposed outer semiconductive layer, a length of exposed insulating layer and a length of exposed electric conductor, an electric field control element adapted to be arranged around a portion of said power cable, said electric field control element comprising: first and second longitudinally spaced semiconducting electrodes; a field grading layer longitudinally extending between the first and second semiconducting electrodes and in electric contact therewith; an insulating layer surrounding the semiconducting electrodes and the field grading layer, wherein the first semiconducting electrode is positioned across a first boundary between the first length of exposed outer semiconductive layer and the length of exposed insulating layer, wherein said second semiconducting electrode (160) is electrically connected with said length of exposed electric conductor (20), a tubular insulating body adapted to house said power cable and said electric field control element.

A joint for high voltage direct current cables extending along a longitudinal axis between two opposite end portions, the joint including: a central semiconducting electrode; two semiconducting deflectors; a field grading layer longitudinally extending between each one of the deflectors and the central electrode and in electric contact therewith; a joint insulating layer surrounding the central electrode, the two deflectors and the field grading layer; and a joint outer semiconductive layer surrounding and in direct contact with the insulating layer.

A joint for high voltage direct current cables extending along a longitudinal axis between two opposite end portions, the joint including: a central semiconducting electrode; two semiconducting deflectors; a field grading layer longitudinally extending between each one of the deflectors and the central electrode and in electric contact therewith; a joint insulating layer surrounding the central electrode, the two deflectors and the field grading layer; and a joint outer semiconductive layer surrounding and in direct contact with the insulating layer.

An arrangement for connecting a coaxial cable (500) to a connector, wherein the coaxial cable (500) comprises at least one metal braid layer (506) surrounding inner parts of the cable (500) and an outer insulating layer (508) surrounding said at least one metal braid layer (506); the connector comprises a ferrule (512) to be arranged in electrical contact with said at least one metal braid layer (506) and means (514, 516) for applying a pressure force (522) to the outer insulating layer (508) of the coaxial cable (500) in a position of said electrical contact; and a silicone sleeve (520) is arranged between said means (514, 516) for applying a pressure force (522) and the outer insulating layer (508) of the coaxial cable (500) in a position that, when said inner parts (502, 504) of the cable (500) are inserted within the ferrule (512), said pressure force (522) is applied to the silicone sleeve (508).

An arrangement for connecting a coaxial cable (500) to a connector, wherein the coaxial cable (500) comprises at least one metal braid layer (506) surrounding inner parts of the cable (500) and an outer insulating layer (508) surrounding said at least one metal braid layer (506); the connector comprises a ferrule (512) to be arranged in electrical contact with said at least one metal braid layer (506) and means (514, 516) for applying a pressure force (522) to the outer insulating layer (508) of the coaxial cable (500) in a position of said electrical contact; and a silicone sleeve (520) is arranged between said means (514, 516) for applying a pressure force (522) and the outer insulating layer (508) of the coaxial cable (500) in a position that, when said inner parts (502, 504) of the cable (500) are inserted within the ferrule (512), said pressure force (522) is applied to the silicone sleeve (508).

The present invention provides a millable silicone rubber composition characterized by comprising: (A) two raw alkenylated organopolysiloxane rubbers (A-1) and (A-2), i.e., a raw organopolysiloxane rubber including a molecular chain which is represented by a specific empirical formula and in which each of both terminals has been blocked with a trialkenylsiloxy group and a raw organopolysiloxane rubber including a molecular chain which is represented by a specific empirical formula and in which each of both terminals has been blocked with a monoalkenyldialkylsiloxy group; (B) an organohydrogenpolysiloxane having at least two silicon-atom-bonded hydrogen atoms in the molecule; (C) carbon black having an average primary-particle diameter of 100-350 nm; (D) reinforcing fumed silica having a specific surface area, as determined by the BET adsorption method, of 50 m.sup.2/g or greater; and (E) a platinum-group metal catalyst. This millable silicone rubber composition has an excellent electric-field relaxation ability, a high elongation at break, a reduced tension set, and high dielectric or insulating properties.

A tubular cable interconnect unit arranged on an outer periphery of a joint of a power cable, includes a tubular insulating tube, a non-ohmic resistor layer formed from a non-ohmic composition and provided on an inner peripheral surface of the insulating tube, and an inner semiconductive layer provided on the non-ohmic resistor layer, wherein the non-ohmic composition includes a base polymer including at least one of thermoplastic and rubber, and varistor grains having a non-ohmic characteristic in which a volume resistivity varies non-linearly with respect to an applied voltage, and the varistor grains have a maximum grain diameter of 30 m or less.

The invention relates to a silicone rubber composition having specific dielectric properties which can be used as insulator material in high voltage direct current applications and a method for the manufacture of cable accessories like cable joints. The invention comprises as well a method for the determination of the optimum dielectric properties and the related amount of dielectric active additives.

An undersea connection system for connecting together at least three high voltage or very high voltage undersea electric cables comprises an outer cage defining a connection space; and a connection fitting comprising a conductive connection electrode that presents a junction node from which there extend at least three branches. Each of the at least three branches of the conductive electrode includes a male terminal portion that is connected to a respective one of the electric cables in a connection zone about which there is mounted a connection sleeve made of pre-molded insulating material that receives, via its ends, firstly the male terminal portion of one of the branches of the conductive electrode, and secondly the connection end of one of the electric cables.