IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0728959
(2007-03-26)
|
등록번호 |
US-7381900
(2008-06-03)
|
우선권정보 |
NO-20061613(2006-04-10) |
발명자
/ 주소 |
- Bremnes,Jarle Jansen
- Nygard,Ole Kristen
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
0 |
초록
▼
Electric power cable used as a riser (15) and/or feeder cable (16) in a Direct Electric Heating system for oil or condensate pipelines (10), comprising at least two conductors (1, 5) and insulation layers (3, 6). An outer concentric conductor (5) is connected to a near end of the pipeline, and a cen
Electric power cable used as a riser (15) and/or feeder cable (16) in a Direct Electric Heating system for oil or condensate pipelines (10), comprising at least two conductors (1, 5) and insulation layers (3, 6). An outer concentric conductor (5) is connected to a near end of the pipeline, and a central conductor (1) is connected via a piggyback cable (12) to a far end of the pipeline, to provide power for the heating. Another aspect is a terminal assembly adapted to providing an electric connection of the electric power cable with the pipeline (10), where a cone (41) is adapted to squeeze the concentric conductor (5) against a concentric conductor adapter (40).
대표청구항
▼
The invention claimed is: 1. Electric power cable used as a riser and/or feeder cable in a Direct Electric Heating system for oil or condensate pipelines, comprising: at least two conductors; insulation layers; armouring means; and an outer protective sheath, wherein an outer concentric conductor o
The invention claimed is: 1. Electric power cable used as a riser and/or feeder cable in a Direct Electric Heating system for oil or condensate pipelines, comprising: at least two conductors; insulation layers; armouring means; and an outer protective sheath, wherein an outer concentric conductor of said at least two conductors is connected to a near end of the pipeline, and a central conductor of said at least two conductors is connected via a piggyback cable to a far end of the pipeline, to provide power for the heating of said pipeline, and a first insulation layer of said insulation layers is located between the central and the concentric conductors and a second insulation layer of said insulation layers is located outside the concentric conductor. 2. Electric power cable according to claim 1, wherein the first insulation layer surrounding the central conductor and the second insulation layer surrounding the concentric conductor are dimensioned in accordance with the voltage levels concerned. 3. Electric power cable according to claim 1, wherein the first and the second insulation layers are made of the same insulation material, and the first insulation layer is thicker than the second insulation layer. 4. Electric power cable according to claim 1, wherein the second insulation layer surrounding the concentric conductor is dimensioned to provide sufficient insulation to earth, based on pipeline length, nominal current and fault current. 5. Electric power cable according to claim 1, wherein the second insulation layer surrounding the concentric conductor is dimensioned for voltages typically below 1.8 kV dependent on a number of case specific parameters. 6. Electric power cable according to claim 1, wherein the first insulation layer surrounding the central conductor is dimensioned for high voltage normally above 3.6 kV relative concentric conductor, dependent on a number of case specific parameters. 7. Electric power cable according to claim 1, wherein the central conductor cross-section area is greater than 400 mm2. 8. Electric power cable according to claim 1, wherein the central conductor is round, stranded copper wires. 9. Electric power cable according to claim 1, wherein the outer concentric conductor is at least one layer of planetary stranded flat copper wires. 10. Electric power cable according to claim 9, wherein the width of the flat copper wires is more than twice the height. 11. Electric power cable according claim 1, wherein the armouring means are provided by a number of steel armour layers (7) concentrically located outside the second insulation layer (6). 12. Electric power cable according to claim 1, wherein the armouring means are provided by integral tensile strength wire-elements incorporated in at least one of the central and concentric conductors. 13. Electric power cable according preceding claim 1, wherein additional electric or fibre optic signal cables or steel tubes, are located in between the concentric conductor and the armouring layer. 14. Electric power cable according to claim 1, wherein fibre optic elements for piggyback fault detection is located inside a semi-conducting sheath between the two conductors. 15. Terminal assembly comprising: a concentric conductor adapter; a concentric conductor connection point adapted to providing an electric connection of the electric power cable according to claim 1, with a pipeline, wherein the adapter includes at least one cone adapted to squeeze the concentric conductor of the electric power cable against an electrically conductive part of the concentric conductor adapter. 16. Terminal assembly according to claim 15, wherein a press-plate is adapted to press the at least one cone axially inwards to squeeze the outer concentric conductor of the electric power cable. 17. Terminal assembly according to claim 16, wherein the press-plate is made of non-magnetic material. 18. Terminal assembly according to claim 15, wherein the at least one cone is made of non-magnetic material. 19. Terminal assembly according to claim 15, wherein a concentric conductor connection point connects the concentric conductor adapter to the pipeline.
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