IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0504539
(2003-01-29)
|
우선권정보 |
EP-02405124(2002-02-18) |
국제출원번호 |
PCT/CH03/000073
(2003-01-29)
|
§371/§102 date |
20040813
(20040813)
|
국제공개번호 |
WO03/069752
(2003-08-21)
|
발명자
/ 주소 |
- Gramespacher,Hansjoerg
- Greuter,Felix
- Hagemeister,Michael
|
출원인 / 주소 |
|
대리인 / 주소 |
Buchanan Ingersoll & Rooney PC
|
인용정보 |
피인용 횟수 :
25 인용 특허 :
3 |
초록
▼
The surrounding body (1) serves to surround the end, a branching or a connecting point of a high-voltage cable. It has an element (3) with a nonlinear current-voltage characteristic line, which serves to control the electric field in the surrounding area. The field control element (3) contains a pol
The surrounding body (1) serves to surround the end, a branching or a connecting point of a high-voltage cable. It has an element (3) with a nonlinear current-voltage characteristic line, which serves to control the electric field in the surrounding area. The field control element (3) contains a polymer and a filler embedded in the polymer und containing microvaristors, as well as at least a hollow body section extending along an axis (2) and designed flat, with an axially symmetrical inner surface conductive by deforming the surrounding body (1) to an outer surface of the cable. To ensure good field control in cables, which are operated at high voltages, the inner surface of the hollow body section is designed as a variation of the outer surface of the cable and in such a way that the field control in the surrounding area is achieved by altering the number of microvaristors per surface unit as a result of expansion and/or shrinking of the hollow body section after deforming.
대표청구항
▼
We claim: 1. A body for surrounding an end, a branching or a connecting point of a high-voltage cable section having a cable conductor, an electrically conductive cable shielding, a cable insulation and an offset edge separating a shielded and an unshielded area of the cable insulation, which the b
We claim: 1. A body for surrounding an end, a branching or a connecting point of a high-voltage cable section having a cable conductor, an electrically conductive cable shielding, a cable insulation and an offset edge separating a shielded and an unshielded area of the cable insulation, which the body includes: a first field control element comprising: an expandable or shrinkable polymer; a filler embedded in the polymer and comprising a plurality of microvaristors; and at least one section designed as a hollow truncated cone with an inner surface, which is designed differently than an outer surface of the cable section, wherein the inner surface of the hollow truncated cone is designed in such a way that after guiding the body on the outer surface of the cable section and fastening the body by expansion or shrinkage, the number of microvaristors per surface unit is smaller in a first section of the field control element surrounding the unshielded area of the cable insulation than in a second section of the field control element surrounding the shielded area of the cable insulation. 2. The body as claimed in claim 1, wherein an inner diameter determining the dimension of the inner surface changes constantly along the linear axis. 3. The body as claimed in claim 2, wherein the ratio of the minimum inner diameter to the maximum inner diameter of the inner surface is 0.2 to 1.0-fold. 4. The body as claimed in claim 1, wherein, in addition to the inner dimension of the inner surface, the wall thickness of the hollow body section changes along the axis. 5. The body as claimed in claim 1, wherein, in addition to the microvaristors, electrically conductive particles are also embedded in the polymer as the filler. 6. The body as claimed in claim 5, wherein the electrically conductive particles are applied to the microvaristors. 7. The body as claimed in claim 5, wherein the electrically conductive particles provided in the filler make up approximately 0.05 to approximately 5% by volume of the filler. 8. The body as claimed in claim 1, wherein an annular layer made of electrically conductive material is placed on or integrated into the inner surface of the hollow truncated cone of the first field control element, which extends in the direction of the axis only over a partial section of the first field control element. 9. The body as claimed in claim 1, wherein the field control element is formed in an inner surface of an elastically deformable support element made of insulating material. 10. The body as claimed in claim 9, wherein at least a second field control element surrounding the first field control element and separated from the latter by an electrically insulating layer is formed in the support element. 11. The body as claimed in claim 10, wherein the material of the second field control element has a polymer and a filler embedded in the polymer and containing at least one of the microvaristors and electrically conductive particles. 12. The body as claimed in claim 10, wherein the microvaristors of at least one of the first field control element and the second field control element are formed by sintering metal-oxide doped zinc oxide particles. 13. The body as claimed in claim 11, wherein the first and the second field control element have differing electrical properties as a result of choice of different fillers, filler concentrations and/or sintering conditions. 14. The body as claimed in claim 10, wherein a layer of electrically conductive material is placed between the first and the second field control element. 15. The body as claimed in claim 14, wherein the conductive layer is embedded in the insulation layer in an electrically insulating manner. 16. A cable element with a cable section comprising: a cable conductor that can be conducted at high-voltage potential; an electrically conductive cable shielding, a cable insulation arranged between cable conductor and cable shielding, an offset edge separating a shielded and an unshielded area of the cable insulation; and a surrounding body being placed on the cable section, and including a field control element which comprises: a field control element comprising a plurality of sections made of an expandable or shrinkable polymer; a filler embedded in the polymer of the field control element comprising a plurality of microvaristors; and at least one section designed as a hollow truncated cone with an inner surface, which is designed differently than an outer surface of the cable section, wherein the inner surface of the hollow truncated cone is designed in such a way that after the surrounding body has been placed on the outer surface of the cable section and fastened to the cable section by expansion or shrinkage, a number of microvaristors per surface unit in the field control element is smaller in a first section of the field control element surrounding an unshielded area of the cable insulation than in a second section of the field control element surrounding the shielded area of the cable insulation; wherein the first section of the plurality of field control element sections encloses an offset edge of a layer of the cable shielding and an unshielded area of the cable insulation; and the second section connecting to the first section encloses a shielded area of the cable insulation. 17. The cable element as claimed in claim 16, wherein the first section of the plurality of field control element sections connects a coating of the cable shielding and the cable conductor to one another. 18. The cable element as claimed in claim 16, wherein the field control element further comprises at least one of a first field control element and a second field control element, which is surrounding the first field control element, wherein the first field control element and second field control element are guided in an axial direction over the offset edge and are connected only to the cable shielding. 19. The cable element as claimed in claim 18, wherein the second field control element is kept on a floating potential. 20. The cable element as claimed in claim 18, wherein, arranged between the first and the second field control element is an electrically conductive layer, which either is embedded in an electrically insulating manner in an insulation layer separating the two field control elements from one another, or is connected to the second field control element in an electrically conductive manner. 21. The cable element as claimed in claim 16, wherein an annular layer made of electrically conductive material is applied to the inner surface of the hollow truncated cone section of the field control element, which inner surface extends in the direction of the axis over the offset edge.
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