Prysmian S.p.a.

Stefano Pogliani

Paolo Boffi

Luigi Caimi

Ivan Troia

A cable termination system including a power cable sequentially including 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 including: 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 is electrically connected with said length of exposed electric conductor, a tubular insulating body adapted to house said power cable and said electric field control element.

Cable termination system, termination assembly and method for installing such a termination assembly

Electrical field grading material which comprises a non-polar elastomeric polymer, a phyllosilicate filler and a carbon black filler, wherein any carbon black filler present in the electric field grading material has a dibutyl phthalate (DBP) absorption number from 30 to 80 ml/100 g. The above material may be used in electrical cable accessories, particularly electrical cable joints or terminations for medium or high voltage cable. The electrical field grading material according to the present invention has varioresistive properties, particularly a significant variation of electrical conductivity as a function of the applied voltage within a reduced voltage range, so as to guarantee a high value of conductivity above a critical value of the electrical field, and therefore to ensure an even distribution of the electrical field lines within the material.

Electrical field grading material and use thereof in electrical cable accessories

The present invention relates to a cable termination system comprising: &#x2014;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, &#x2014;an electric field control element adapted to be arranged around a portion of said power cable, said electric field control element comprising: &#x2014;first and second longitudinally spaced semiconducting electrodes; &#x2014;a field grading layer longitudinally extending between the first and second semiconducting electrodes and in electric contact therewith; &#x2014;an insulating layer surrounding the semiconducting electrodes and the field grading layer, &#x2014;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, &#x2014;wherein said second semiconducting electrode () is electrically connected with said length of exposed electric conductor (), &#x2014;a tubular insulating body adapted to house said power cable and said electric field control element.

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Milan, Italy

Stefano Pogliani