HIGH-VOLTAGE FEEDTHROUGH AND METHOD FOR THE PRODUCTION THEREOF

Abstract

A high-voltage bushing has an inner conductor which is led through an insulator. The inner conductor has insulating layers which incorporate a plastic fabric. The plastic fabric contains aramid fibers. A method for producing the high-voltage bushing includes winding insulating layers formed from a plastic fabric having aramid fibers onto a winding core to form an insulator.

Claims

1. A high-voltage bushing, comprising: an insulator having insulating layers formed of a plastic fabric containing aramid fibers; and an inner conductor led through said insulator.

2. The high-voltage bushing according to claim 1, wherein said insulator is impregnated with a resin.

3. The high-voltage bushing according to claim 2, wherein said resin is a high-temperature resin.

4. The high-voltage bushing according to claim 2, wherein said resin is an epoxy resin.

5. The high-voltage bushing according to claim 1, wherein said insulator has concentrically disposed, conductive control inserts for field control.

6. The high-voltage bushing according to claim 1, wherein said insulating layers are concentrically or spirally wound about said inner conductor to form a winding.

7. The high-voltage bushing according to claim 2, wherein said resin has a filler.

8. The high-voltage bushing according to claim 7, wherein said filler is formed from solid particles.

9. The high-voltage bushing according to claim 1, wherein the high-voltage bushing is rated for insulation of a service voltage in excess of 100 kV.

10. A method for producing a high-voltage bushing, which comprises the steps of: winding insulating layers formed from a plastic fabric having aramid fibers onto a winding core to form an insulator; and impregnating the insulator with a resin.

11. The method according to claim 10, wherein the resin is a high-temperature resin.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0020] The FIGURE is a schematic representation of an exemplary embodiment of a high-voltage bushing according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0021] Referring now to the single FIGURE of the invention, there is shown a high-voltage bushing 1. The high-voltage bushing 1 contains an inner conductor 2, which is led through an insulator 3. The inner conductor 2 is configured in the form of a hollow conductor of aluminum or copper. The high-voltage bushing 1 contains a housing 7 and shields 8 of silicone, which are mounted on the exterior of the housing 7. A mounting flange 9 which serves for mounting the high-voltage bushing 1 on a wall 10, for example of a transformer tank, is also provided.

[0022] The insulator 3 contains conductive control inserts 4-6 for capacitive field control, which are arranged concentrically about the inner conductor 3. The control inserts 4-6 are separated from one another by wound insulating layers 11, 12. Each insulating layer 11 or 12 is comprised of a plurality of insulating layers of an aramid fabric which, after being wound about the inner conductor 2, have been impregnated with resin. The resin is a high-temperature resin, which is an epoxy resin.

[0023] The high-voltage bushing 1 represented in the FIGURE has an overall length of 12 m and is used for the insulation of a service voltage in excess of 300 kV.

[0024] For the production of the high-voltage bushing 1, the inner conductor 2 is provided as a winding core. The insulating layers of the aramid fabric are wound about the inner conductor 2 winding core to form the insulator 3. The insulator is then impregnated with the high-temperature resin. The solid block obtained in this manner is arranged in the housing 7, wherein a secondary insulation, for example in the form of an insulating gas and/or a dry foam, is arranged between the insulator 3 and the housing 7.

[0025] A high-voltage transformer can be provided, in which the high-voltage bushing 1 is mounted on the wall 10 of a transformer tank such that a transformer winding 13 of the high-voltage transformer is brought out of the transformer tank, in an insulated arrangement, by means of the high-voltage bushing 1.