High-voltage insulator

Abstract

A high-voltage insulator has an insulating body which is arranged around a high-voltage conductor. The high-voltage insulator has a damping chamber which at least partially engages around the insulating body and which is filled with an electrically insulating damping medium for damping an action of external mechanical force on the insulating body. A transformer bushing for routing a high-voltage conductor out of a transformer housing in an electrically insulating manner is further disclosed. The transformer bushing is characterized in that the transformer bushing contains a high-voltage insulator.

Claims

1. A high-voltage insulator, comprising: an insulating body for surrounding a high-voltage conductor, said insulating body containing a winding body which is composed of insulating layers and electrically conductive inserts, said electrically conductive inserts being disposed concentrically around said high-voltage conductor and being separated from one another by said insulating layers; an electrically insulating damping medium; and a damping chamber at least partially engaging around said insulating body and being filled with said electrically insulating damping medium for damping an action of external mechanical force on said insulating body, said damping chamber being disposed radially on an outside of said winding body.

2. The high-voltage insulator according to claim 1, further comprising: a first tube; and a second tube being at a distance from said first tube, said first tube and said second tube are each disposed concentrically in relation to the high-voltage conductor and at least partially delimit said damping chamber.

3. The high-voltage insulator according to claim 2, wherein at least one of said first tube or said second tube is produced from a plastic fiber composite material, a metal matrix composite material, a ceramic fiber composite material or a hard metal.

4. The high-voltage insulator according to claim 1, wherein said electrically insulating damping medium has an electrical conductivity of less than 0.001 S/m.

5. The high-voltage insulator according to claim 1, wherein said electrically insulating damping medium is a damping liquid.

6. The high-voltage insulator according to claim 5, wherein said damping liquid is a liquid of low flammability.

7. The high-voltage insulator according to claim 1, wherein said electrically insulating damping medium is a dry foam.

8. The high-voltage insulator according to claim 7, wherein said dry foam is a polyurethane foam.

9. The high-voltage insulator according to claim 1, wherein said winding body has a resin impregnation.

10. A transformer bushing for routing a high-voltage conductor out of a transformer housing in an electrically insulating manner, the transformer bushing comprising a high-voltage insulator according to claim 1.

11. A high-voltage insulator, comprising: a high-voltage conductor; an insulating body surrounding said high-voltage conductor, said insulating body containing a winding body which is composed of insulating layers and electrically conductive inserts, said electrically conductive inserts being disposed concentrically around said high-voltage conductor and being separated from one another by said insulating layers; an electrically insulating damping medium; and a damping chamber at least partially engaging around said insulating body and being filled with said electrically insulating damping medium for damping an action of external mechanical force on said insulating body, said damping chamber being disposed radially on an outside of said winding body.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

(1) FIG. 1 is a diagrammatic, cross-sectional view through an exemplary embodiment of a high-voltage insulator according to the invention; and

(2) FIG. 2 is a diagrammatic, cross-sectional view through an exemplary embodiment of a transformer bushing according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

(3) Referring now to the figures of the drawings in detail and first, particularly to FIG. 1 thereof, there is shown a cross-sectional view through a side of a high-voltage insulator 1. The high-voltage insulator 1 has an insulating body 2 which is arranged around a high-voltage conductor 3 and surrounds the high-voltage conductor on an axial length section. In the exemplary embodiment illustrated in FIG. 1, the high-voltage insulator 1 has cylinder symmetry. The axis of symmetry of the cylinder-symmetrical high-voltage insulator 1 is illustrated by a broken line 9.

(4) The insulating body 2 contains control inserts 21 which are arranged concentrically around the high-voltage conductor 3, are composed of aluminum foil and are separated from one another by insulating layers 22 which are composed of resin-impregnated paper.

(5) The high-voltage insulator 1 contains a first tube 4 and also a second tube 5 which is arranged at a distance from the first tube 4. The first tube 4 and the second tube 5 are each arranged concentrically around the high-voltage conductor 3. A hollow space which forms the damping chamber 6 is formed axially between the first tube 4 and the second tube 5. The damping chamber 6 is filled with a damping medium. In the exemplary embodiment illustrated in FIG. 1, the damping medium is a hard foam which is composed of polyurethane foam.

(6) Plate-like insulating elements 7 which are formed from a silicone composite material are arranged radially on the outside of the high-voltage insulator 1. The high-voltage insulator 1 further contains fastening devices 8 which are designed to fasten the high-voltage insulator 1 to a wall. Since the fastening devices 8 are connected to a ground-connected wall, the fastening devices 8 are at ground potential. However, the high-voltage conductor 3 is at high-voltage potential, at 420 kV in the illustrated example.

(7) An action of force on the high-voltage insulator 1 at specific points from outside the high-voltage insulator 1, for example owing to a projectile which is shot at the high-voltage insulator 1, initially deforms the second outer tube 5 at specific points. The projectile penetrates the second tube 5 and therefore enters the damping chamber 6. The energy of the projectile is absorbed by the damping medium in the damping chamber 6. Any remaining force of the projectile is distributed in the damping chamber or the damping medium in such a way that a pressure which is generated as a result is distributed over a larger area of the first tube 4. Severe deformation or even fracture of the first tube 4 can be prevented in this way. The insulating capability of the insulating body 2 is accordingly also maintained in the event of an action of external force at specific points.

(8) FIG. 2 shows an exemplary embodiment of a transformer bushing 10. The transformer bushing 10 is configured to route a high-voltage conductor 11, which is at high voltage, out of a transformer housing 12 of a power transformer 13.

(9) The transformer bushing 10 shown in FIG. 2 provides an electrical transition from the transformer 13 to an outdoor high-voltage connection, not illustrated. The transformer bushing 10 extends from its high-voltage-side or transformer-side—in FIG. 2, lower—end, through a carrying flange, not illustrated, for fastening to the transformer housing 12, to the outdoor high-voltage connection.

(10) In this case, the transformer housing 12 is filled with insulating oil 14. The transformer bushing 10 has an insulating body 15 which is arranged concentrically around the high-voltage conductor 11. A cylindrical damping chamber 16 is fitted to the outside of the insulating body 15. The damping chamber 16 extends in a longitudinal direction of the transformer bushing 10 from the wall of the transformer 13 up to an end, not illustrated in FIG. 2, of the transformer bushing 10, which end is remote from the transformer. Damage to the insulating body of the transformer bushing 10 can be prevented by the damping chamber 16 and the damping medium arranged therein in such a way that the risk of ignition of the insulating oil 14 is minimized.