SURGE ARRESTER

Abstract

A surge arrester has a resistance column which is pressed together by one or more clamping devices. The clamping devices are each fixed at both ends of the resistance column to an end fitting by way of a fixing device. An electrically insulating housing encloses the fixing device. Each end fitting has a first contour, on which the fixing devices are arranged and which is enclosed by the housing. The end fitting also has a second contour with a smaller diameter than the first contour.

Claims

1. A surge arrester, comprising: a resistance column that is pressed together by at least one clamping device; an end fitting at each end of said resistance column, said end fitting having a first contour with a given diameter and a second contour with a diameter that is smaller than the given diameter of said first contour; a fixing device fixing said at least one clamping device at each end of said resistance column to said end fitting, said fixing device being disposed on said first contour; an electrically insulating housing enclosing said fixing device.

2. The surge arrester according to claim 1, wherein said first contour is formed with at least one opening, and said at least one clamping device is fixed by said fixing device in said opening.

3. The surge arrester according to claim 2, wherein said fixing device has a substantially conically shaped conical segment affixed to said clamping device, and wherein said opening is shaped so as to correspond to said conical segment.

4. The surge arrester according to claim 1, wherein said second contour is in each case arranged on a side of said first contour that faces away from said resistance column.

5. The surge arrester according to claim 1, wherein said second contour has a sealing face, on which said outer housing rests with a form fit, so that the outer housing completely encloses said first contour.

6. The surge arrester according to claim 1, wherein said second contour in each case has at least one connecting device for mechanical and/or electrical connection of the surge arrester.

7. The surge arrester according to claim 1, wherein said outer housing consists at least partly of silicone.

8. The surge arrester according to claim 1, wherein said resistance column includes a plurality of metal oxide resistors arranged one above another.

9. The surge arrester according to claim 1, wherein said at least one clamping device is one of at least four clamping devices.

10. The surge arrester according to claim 1, wherein said at least one clamping device comprises an electrically non-conductive plastic.

11. The surge arrester according to claim 1, wherein each clamping device comprises a glass fiber reinforced rod.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

[0028] FIG. 1 shows a perspective view of an embodiment of an end fitting of a surge arrester according to the invention;

[0029] FIG. 2 is a perspective view showing the end fitting from FIG. 1 with an outer housing made of silicone; and

[0030] FIG. 3 shows a cross section through the end fitting with the outer housing according to FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION

[0031] Referring now to the figures of the drawing in detail and first, particularly, to FIG. 1 thereof, there is shown an end fitting 7, 8 of a surge arrester 1 according to the invention. The end fitting has a first contour 7 and a second contour 8. The two contours 7, 8 are each formed as a disk, which are stacked one above another on a common center. The first contour 7 has a diameter 6, and the second contour 8 has a diameter 5. In this way, the second contour 8 forms an annular step on the first contour 7. The two contours 7, 8 can be produced from one work piece or they may be assembled from two work pieces.

[0032] Located on the step are flange apertures or openings 9, in which the ends of clamping devices 10 can be seen. The clamping devices 10 here are glass fiber-reinforced rods, which are distributed angularly symmetrically (i.e. with the same angular spacing from one another) on the step running around the second contour.

[0033] The second contour 8 forms with its cylindrical outer a sealing face 14, on which the silicone ends as the outer housing is cast. The second contour is formed with openings 2, 3, 4. The opening 3 has a connecting device 3 for a mechanical and/or electrical connection of the surge arrester. The openings 2, 3 can be formed, for example, as further connecting openings or as attachment points for mounting tools.

[0034] FIG. 2 shows the surge arrester 1 following the casting of an outer housing made of silicone. Silicone flows completely around the first contour, so that the openings for the clamping devices are also protected reliably against the penetration of moisture. Only the second contour 8 projects by about half its height out of the silicone sheath.

[0035] FIG. 3 shows a cross section through the end fitting of the surge arrester 1. The connecting device 3 has a depth 12 and is provided with an internal thread. The cross section shows two openings 9 in the first contour 7, in each of which a fixing device 13 fixes the respective clamping device 10. The housing of silicone 11 covers the first contour 7 completely and ends on the sealing face 14 of the second contour 8.