A high-voltage DC cable joint including a multi-wall layered construction having individual concentrically arranged layers. The joint includes, from inside to outside, an inner conductive rubber layer, a field grading rubber layer made from a predetermined tailored formulation, an insulating rubber layer and an outer conductive rubber layer. The field grading rubber layer separates and interconnects the conductive rubber layers, and wherein the rubber layers are cross-linked by a by-product-free manufacturing method. The cable joint is preferably made from platinum cured rubbers by moulding process steps. In a preferred embodiment the cable joint is made by injection moulding.

A heating assembly configured to receive a power cable for restoring an insulation system of the power cable, the heating assembly including: a central pressurisation and heating structure, and a first and second lateral structure provided at a respective axial end of the central pressurisation and heating structure, the first and second lateral structure each having at least a 20 cm long axially extending section primarily made of a material at most having a conductivity of the order of 1000 S/m at 20° C.

A pressurisation and heating device for restoring an insulation system of a power cable, the pressurisation and heating device including: a first part including a first channel configured to receive a portion of the power cable, a second part including a second channel configured to receive a portion of the power cable, wherein the pressurisation and heating device is configured to be set in a closed state in which the first channel faces the second channel thereby forming a heating chamber extending from a first end to a second end, opposite the first end, of the pressurisation and heating device, wherein the pressurisation and heating device is configured to be pressurised to obtain a pressure higher than atmospheric pressure inside the heating chamber when the power cable is arranged sealed in the heating chamber, wherein the pressurisation and heating device has an at least 20 cm long axially extending section which is primarily made of material at most having a conductivity of the order of moo S/m at 20° C.

A sleeve (19) arranged to be slidably received within a passage (9) defined in a body of a cable gland (1), the sleeve (19) arranged to receive a settable sealing material for forming a seal to a cable passing through the sleeve, wherein the sleeve (19) comprises: an annular side wall (79) extending along an axial length and having a first end and a second end; and an end wall (100) capping the first end of the annular side wall (79), in which the annular side wall (79) and the end wall (100) define a void (106) within them into which settable sealing material can be received.

A method of sealing a cable (10), the cable having at least one core (11) and at least one sheath (12) surrounding at least one core (11), the method acting to seal each core (11) relative to each sheath (12), the method comprising exposing each core (11) from each sheath (12) to form an exposed part of each core (11), with an unexposed part of a core (11) remaining with each sheath (12), positioning the exposed part of each core (11) and the unexposed part of each core (11) within a tube (1), and filling the tube (1) with a settable sealing material (6).

An insulation system for jointing of high voltage conductors has an inner layer made of a crosslinked first polymeric semiconducting material, an intermediate insulating layer made of a thermoplastic polymeric insulating material, and an outer layer made of a second polymeric semiconducting material. The insulation system is adapted for surrounding the electric conductor joint.

A dispenser apparatus (10) for dispensing curable liquid material into a space in a cable gland is disclosed. The apparatus comprises a housing (12) for separately storing of components of a curable liquid material and provided with a respective first outlet (14) for each component. A mixing chamber (16) mixes the components to cause curing of the curable liquid material and has an inlet (18) for receiving the components from the first outlets, and a second outlet (20) for the mixed components. A plunger (22) urges the components out of storage chambers of the housing via the first outlets and into the mixing chamber via the inlet. The dispenser apparatus is adapted to be located in a body of a cable gland such that the mixed components are dispensable from, the second outlet into a space defined by the body and a cable extending through the body.

Various embodiments of the teachings herein include an electrical device comprising: a cable wire; a cable insulation arranged around the cable wire such that a section of the cable wire at least partially longitudinally protrudes out of the cable insulation; a heat-shrink tube at least partially arranged around the cable insulation and at least partially around the section of the cable wire; and a sealing material at least partially inside the cable insulation thereby sealing any gaps between the cable wire and the cable insulation.

In one example, an apparatus for jointing power cables includes a mold extending along a longitudinal axis, and having a feeding inlet and being made of two halves forming a longitudinal pass-through seat for receiving the cables. An extruder is connected to the feeding inlet. A heating system and a cooling system is associated with the mold. A measuring system for detecting temperature or pressure includes a plurality of probes for detecting temperature or pressure.

An electric field control device for a high voltage cable includes a stress cone and a field grading adapter, wherein the stress cone and the field grading adapter are chemically bonded by vulcanization. An electric installation includes a power cable and the electric field control device. A method for producing the electric field control device is also disclosed.