Submarine low loss cable system and method for arranging a submarine cable landfall system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01B-007/00
H01B-007/14
H02G-001/06
H02G-009/02
H01B-007/02
출원번호
US-0832264
(2017-12-05)
등록번호
US-10056169
(2018-08-21)
우선권정보
EP-16306632 (2016-12-07)
발명자
/ 주소
Hatlo, Marius
Olsen, Espen
출원인 / 주소
Nexans
대리인 / 주소
Sofer & Haroun, LLP
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
A low loss cable system adapted for use as a cable landfall system. The cable system comprises a cable having a plurality of cores. Each core comprises a conductor, a first insulating layer, a second electrically conductive layer and a third layer. The cable comprises two sections, connected at a co
A low loss cable system adapted for use as a cable landfall system. The cable system comprises a cable having a plurality of cores. Each core comprises a conductor, a first insulating layer, a second electrically conductive layer and a third layer. The cable comprises two sections, connected at a connection point CP. A first section of the cable is arranged to be exposed to a landfall area and a second section of the cable is arranged to be exposed to a submarine area. The cable is arranged such that circulating currents are prevented or reduced in the second conductive layers of the cable in the section exposed to the landfall area, thus assisting in maintaining the ampacity of the cable in this section without, or by reducing, the need to increase the cross sectional area of the cable in the landfall area. This is accomplished by electrically connecting the second conductive layers of the cores to each other at the connection point. At a distal end of the first section of the cable, the second layers are arranged to leave an open ended termination, thus avoiding a closed circuit that would otherwise create circulating currents in the second layers of the first section, thus maintaining ampacity.
대표청구항▼
1. A submarine low loss cable system, comprising a high voltage alternating current cable comprising a plurality of cable cores, each core comprising: a central, electrical conductor,a first, electrically insulating layer arranged radially outside of the electrical conductor,a second, electrically c
1. A submarine low loss cable system, comprising a high voltage alternating current cable comprising a plurality of cable cores, each core comprising: a central, electrical conductor,a first, electrically insulating layer arranged radially outside of the electrical conductor,a second, electrically conducting layer arranged radially outside of the first layer, anda third layer arranged radially outside of the second layer,wherein:a first section of cable is connected to a second section of cable at a connection point, said second section being adapted to being exposed to a submarine area,at which connection point the second layers of each core are electrically connected to each other, and wherein at a distal end of first section of cable, the second layers are terminated as an open ended termination. 2. The cable system according to claim 1, wherein the second layers of each core are electrically connected to each other at the connection point by a metal strip. 3. The cable system according to claim 2, wherein the metal strip is connected to a grounding electrode. 4. The cable system according to claim 1, wherein in said second section, the third layer of each core is a semiconducting layer being in electrical contact with its underlying second layer, and wherein the third electrically semiconducting layers of each core are in electrical contact with each other, thereby electrically connecting the second layers of each core through the electrically semiconducting layers. 5. The cable system according to claim 4, wherein in said second section, the third electrically semiconducting layer of each core is adapted to be in electrical contact with the surroundings of the cable, thereby grounding the second layers via the semiconducting layers. 6. The cable system according to claim 1, wherein in said second section, the third layer of each core comprises alternating first and second segments, wherein first segment is made of an electrically insulating material and wherein second segment is made of an electrically semiconducting material, which semiconducting segments are in electrical contact with the underlying second layer, thereby electrically connecting the second layers through the third layer's electrically semiconducting segments. 7. The cable system according to claim 6, wherein an electrically semiconducting segment is immediately adjacent to the connection point. 8. The cable system according to claim 7, wherein said electrically semiconducting segments are adapted to be in electrical contact with the surroundings of the cable, thereby grounding the second layers via the semiconducting segments. 9. The cable system according claim 1, wherein a surge voltage limiter is connected to the second layer of each core at distal end. 10. The cable system according to claim 1, wherein in said first section, the electrical conductor of each core has a first cross sectional area, and in said second section, the electrical conductor of each core has a second cross sectional area, the first cross sectional area being larger than the second cross sectional area. 11. The cable system according to claim 1, wherein the first and second sections of the cable are jointed with a factory performed splice or joint at the connection point. 12. The cable system according to claim 1, wherein the first and second sections of the cable are adapted to be jointed with a field performed splice or joint at the connection point. 13. The cable system according to claim 1, wherein said open ended termination at distal end of the cable's first section is adapted to be coupled to any one of the following: a land cable, a cable connection unit, a cable landing station and a cable termination station. 14. The cable system according to claim 1, wherein a distal end of the second section is adapted to be coupled to any one of the following: a submarine cable landfall system, a subsea unit, a ground-fast platform and a floating unit. 15. The cable system according to claim 1, wherein said system is arranged as a cable landfall system, whereby said high voltage alternating current cable: traverses a cable landfall position separating a sea-side portion of the cable from a land-side portion of the cable,said connection point is located on the sea-side portion of the cable, at a predetermined distance from the landfall position,said first section extends from the connection point and further into the land-side portion of the cable,said second section extends from the connection point and further out into the sea-side portion of the cable. 16. The cable system according to claim 15, wherein said predetermined distance between the connection point and the landfall position is within the range of 0 to 4 kilometres. 17. The cable system according to claim 15, wherein the first section of the cable traverses a landfall region. 18. A method of arranging a cable landfall system, comprising: providing a low loss cable system according to claim 1,arranging the cable system to traverse a cable landfall position separating a sea-side portion of the cable from a land-side portion of the cable,locating the connection point on the sea-side portion of the cable, at a predetermined distance from the landfall position, such that:said first section extends from the connection point and further into the land-side portion of the cable,said second section extends from the connection point and further out into the sea-side portion of the cable. 19. The method according to claim 18, wherein said predetermined distance between the connection point and the landfall position is within the range of 0 to 4 kilometres. 20. The method according to claim 18, wherein the first section of the cable traverses a landfall region.
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이 특허에 인용된 특허 (4)
Crawford Stuart (Kent GB3) Sykes Philip (Kent GB3), Laying underwater cables.
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