High-Voltage Device

Abstract

A high-voltage device has an inner conductor and an insulating body, which surrounds the inner conductor along the longitudinal direction of the inner conductor. Electrically conductive control inserts for field control are arranged concentrically around the inner conductor and are spaced apart from each other by insulating layers. An electrically conductive connection extends between the inner conductor and a first control insert that is closest to the inner conductor. An electrically conductive connection extends between the inner conductor and a second control insert. The second control insert extends axially beyond the first control insert to a foot end of the high-voltage device.

Claims

1-10. (canceled)

11. A high-voltage device, comprising: an inner conductor extending in a longitudinal direction; an insulating body surrounding said inner conductor along said longitudinal direction; a plurality of electrically conductive control linings for field control arranged concentrically around said inner conductor and spaced apart from another by insulating layers, said control linings including a first control lining closest to said inner conductor and a second control lining extending axially to a foot end of the high-voltage device beyond said first control lining; an electrically conductive connection between said inner conductor and said first control lining; and an electrically conductive connection between said inner conductor and said second control lining.

12. The high-voltage device according to claim 11, wherein said insulating body is formed with a recess having a shape of a truncated cone and opening to the foot end of the high-voltage device, and said second control lining extends axially into a part of the insulating body that surrounds said recess.

13. The high-voltage device according to claim 11, wherein said second control lining is closest to said first control lining.

14. The high-voltage device according to claim 11, which comprises a first metal strap disposed to electrically connect said inner conductor with said first control lining.

15. The high-voltage device according to claim 14, which comprises a second metal strap disposed to electrically connect said first control lining with said second control lining.

16. The high-voltage device according to claim 15, wherein said electrically conductive connection between said second metal strap and said second control lining is solderless connection.

17. The high-voltage device according to claim 12, wherein said recess having the form of the truncated cone is configured to accept a conductor section of a high-voltage cable and the high-voltage device further comprises a plug-in contact for connecting the conductor section to said inner conductor.

18. The high-voltage device according to claim 17, which comprises an electrically insulating sealing layer applied to an inner surface of said recess.

19. The high-voltage device according to claim 18, wherein said second control lining extends axially into a part of said insulating body that surrounds said sealing layer.

20. The high-voltage device according to claim 11, wherein said insulating body comprises resin-impregnated paper.

Description

[0020] The invention is explained below with reference to an exemplary embodiment illustrated in the FIGURE.

[0021] The FIGURE shows a schematic, cross-sectional view of a high-voltage device according to the invention.

[0022] In detail, according to the invention a high-voltage device 1 in the form of a cable end termination is shown in the FIGURE. The high-voltage device 1 is constructed essentially cylindrically symmetrically around a longitudinal direction 3 which forms the axis of symmetry. The high-voltage device 1 comprises a cylindrical, hollow inner conductor 2. The inner conductor 2 extends along a longitudinal direction of the high-voltage device 1, which is graphically identified by a longitudinal axis 3.

[0023] The high-voltage device 1 comprises a head end 4 with a head fitting 5 for fastening an electrical conductor of an overhead line not shown graphically in the FIGURE.

[0024] The high-voltage device 1 further comprises an insulating body 6 which surrounds the inner conductor 2 along its longitudinal direction. It can be seen that the insulating body 6 does not surround the inner conductor 2 along its entire length. This is not in fact necessary either in the exemplary embodiment of the invention illustrated in the FIGURE or in any other exemplary embodiment. The insulating body 6 comprises control linings 7, 8, 9 arranged concentrically around the inner conductor 2. The control linings 7-9 are separated from one another by insulating layers 10, 11. The insulating layers 10, 11 comprise paper which, like the entire insulating body 6, is impregnated with a resin. The insulating body 2 is surrounded by an outer housing 18 of the high-voltage device 1.

[0025] For reasons of clarity, only three control linings 7-9 are illustrated graphically in the FIGURE. The number of control linings can, however, in general be higher, and adapted to the particular application. The radial distance between the individual control linings usually amounts to a few millimeters.

[0026] The high-voltage device 1 further comprises a foot end 12 which is arranged opposite to the head end 4. A foot fitting for fastening a high-voltage cable not illustrated in the FIGURE is arranged at the foot end 12. For reasons of clarity, the foot fitting is not shown graphically in more detail on the FIGURE.

[0027] The insulating body 6 comprises a recess 13. The recess 13 has the form of a truncated cone that points with its opening end to the foot end 12. A part of an inner face of the recess 13 is covered by a sealing layer 14 of silicone. The sealing layer 14 seals a contact location between the high-voltage device 1 and the cable section of the high-voltage cable that is inserted into the recess 13.

[0028] The inner conductor 2 is electrically connected to a first control lining 7 by means of a first metal strap 15. The first control lining 7 is arranged closest to the inner conductor 2. The first metal strap 15 extends into the insulating body 6. A second control lining 8 extends to the foot end 12 further than the first control lining 7. The second control lining 8 extends in particular into the part of the insulating body 6 that surrounds the recess 13 and the sealing layer 14.

[0029] To establish a screening effect with respect to the transfer location between the plug-in contact piece (not illustrated in the FIGURE) and also the sealing layer 14 and the insulating body 6, the second control lining 8 is electrically connected to the first control lining 7 by means of a second metal strap 16. When the high-voltage device 1 is operating, the second control lining 8 is thus at the same electrical potential as the inner conductor 2. Due to the screening the field lines at the foot end 12 adopt a relatively uniform profile. To illustrate this, one field line section 17 is shown in an approximate, schematic manner in the FIGURE by means of a broken line.

[0030] A housing 18 gives mechanical strength to the high-voltage device 1. A fastening flange 19 serves to mount the high-voltage device 1 on a component of a high-voltage installation provided for this purpose.