Surge arrester and production method for a surge arrester

Abstract

An item of electrical equipment includes a core clad with a glass fiber material. The glass fiber material is preimpregnated with a resin. A layer of a substance is applied to the glass fiber material. The substance is formed at least partly of high-temperature vulcanizing silicone rubber. A corresponding production method is also provided.

Claims

1. A surge arrester, comprising: a core being an arrester column; a glass fiber material cladding said core, said glass fiber material being preimpregnated with a resin; and a layer of a substance formed at least partially of high-temperature vulcanizing silicone rubber, said layer being applied onto said glass fiber material; said layer at least partially filling cavities between said core and said glass fiber material with said substance.

2. The surge arrester according to claim 1, wherein said layer at least partially fills cavities in said glass fiber material with said substance.

3. The surge arrester according to claim 1, wherein said glass fiber material is wrapped around said core.

4. The surge arrester according to claim 3, wherein said glass fiber material is applied as a tape having a width being less than a length of said core.

5. The surge arrester according to claim 4, wherein said tape is wrapped around said core multiple times.

6. The surge arrester according to claim 1, which further comprises a housing having creepage path-lengthening shields, said housing being provided on said layer, and said housing being formed of a material at least partially including a high-temperature vulcanizing silicone rubber.

7. The surge arrester according to claim 1, wherein set a restore column has a plurality of varistor disks.

8. The surge arrester according to claim 7, wherein the surge arrester is configured for medium-voltage applications.

9. A production method for surge arrester, the production method comprising: stabilizing a core by cladding the core with a glass fiber material, the glass fiber material being preimpregnated with a resin; and applying a layer of a substance onto the glass fiber material by using an injection molding method, and at least partially using a high-temperature vulcanizing silicone rubber for the substance.

10. The production method according to claim 9, which further comprises at least partially filling cavities between the core and the glass fiber material with the substance by carrying out the step of applying the layer.

11. The production method according to claim 9, which further comprises at least partially filling cavities in the glass fiber material with the substance by carrying out the step of applying the layer.

12. The production method according to claim 9, wherein the core is an arrester column of the surge arrester having a plurality of varistor disks.

13. The production method according to claim 9, which further comprises applying a housing having creepage path-lengthening shields on the layer, and using a substance at least partially including a high-temperature vulcanizing silicone rubber for the housing.

14. A device, comprising: a core; a glass fiber material cladding said core, said glass fiber material being preimpregnated with a resin; and a layer of a substance formed at least partially of high-temperature vulcanizing silicone rubber, said layer being applied onto said glass fiber material; said layer at least partially filling cavities between said core and said glass fiber material with said substance.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

(1) FIG. 1 shows an intermediate step in the production of a surge arrester, and

(2) FIG. 2 shows an exemplary embodiment of a surge arrester, and

(3) FIG. 3 shows a detail view of the exemplary embodiment according to FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

(4) FIG. 1 shows an intermediate step in the production of an item of electrical equipment. A surge arrester 1 for medium-voltage applications, which comprises a core having a plurality of varistor disks 2 in an arrester column, is shown. End fittings 4, 5 are respectively arranged at the ends of the arrester column. A tape 9 which comprises a glass fiber material 3 is wrapped around the arrester column, the glass fiber material 3 being preimpregnated with a resin. The tape 9 has a width d which is less than the length e of the core having the varistor disks 2, so that it can be wrapped circumferentially and slightly obliquely around the core.

(5) FIG. 2 shows a cross section through an exemplary embodiment of a completed surge arrester, although only the technical details required for the invention are shown. The varistor disks 2, or the arrester column, are fully provided with a layer 6 which is applied onto the glass fiber material 3. The layer 6 consists of a substance which consists at least partially of high-temperature vulcanizing (HTV) silicone rubber.

(6) A housing 11 having creepage path-lengthening shields 10 is provided on the layer 6, the housing 11 likewise consisting of the material, i.e. also at least partially comprising a high-temperature vulcanizing silicone rubber. In this case, the layer 6 and the housing 11 with shields 10 were produced in a single injection molding step.

(7) It is shown in FIG. 3 that the substance comprising the HTC silicone is applied by the injection molding method under high pressure in such a way that cavities 7 between the core having the varistor disks 2 and the glass fiber material 3 are substantially filled with the substance. Cavities 8 in the glass fiber material are also substantially filled with the substance.

(8) The exemplary embodiment of the invention has the advantage that an item of equipment, for example a surge arrester, can be produced economically and so as to be particularly weather-resistant. Furthermore, partial discharges through cavities are reduced or substantially avoided.