Surge arrester with a cage design
The invention relates to a surge arrester having at least one varistor block; two end fittings; one reinforcing element which holds the varistor block under tension at the end fittings and at least one anchoring element, which holds the reinforcing element in a hole through at least one of the end fittings. The reinforcing element is preferable a wedge which splits the reinforcing element and braces with the outer walls of the through-hole. Alternatively, two or more glass-fiber-reinforced reinforcing elements are held in a through-hole, and a wedge between these reinforcing elements ensures that the reinforcing elements are held with a force fit in the end fitting in the area of the through-hole.
1. A surge arrester having:
at least one varistor block;
two end fitting, which are arranged on opposite sides of the varistor block;
at least one reinforcing element which holds the varistor block and the end fittings together;
at least one anchoring element, which holds the reinforcing element in a through-hole through at least one of the end fittings;
characterized in that the anchoring element is a wedge which splits the reinforcing element in its longitudinal direction and braces it against the other walls of the through-hole.
2. A surge arrester having:
at least one varistor block; two end fittings, which are arranged on opposite sides of the varistor block;
at least two reinforcing elements which hold the varistor block and the end fittings together;
at least one anchoring element, which holds the reinforcing element in a through-hole through at least one of the end fittings;
characterized in that at least two reinforcing elements are held in the through-hole through one end fitting, with the anchoring element being a single wedge which braces against each of the reinforcing elements in the through-hole and presses the reinforcing elements against the outer walls of the through-hole.
3. Surge arrester according to claim 1 , characterized that the varistor block or blocks is or are formed from a metal oxide, preferably from zinc oxide.
4. Surge arrester according to claim 1 , characterized in that the end fittings are formed from a metal, preferably from aluminum.
5. Surge arrester according to claim 1 , characterized in that the surge arrester has a housing with screens.
6. Surge arrester according to claim 1 , characterized in that the outer housing is formed by spraying or casting with a low-viscosity silicone.
7. Surge arrester according to claim 2 , characterized in that a gap is provided between the two glass-fibre-reinforced reinforcing elements of a through-hole over the entire length of the surge arrester.
8. A surge arrester, comprising:
a varistor block disposed between a first end fitting and a second end fitting, the first and second end fittings arranged on opposite ends of the varistor block, wherein the first end fitting comprises a body having a plurality of through-boreholes spaced apart from each other, each through-borehole comprising a bore extending entirely through the body;
a reinforcing element that holds the varistor block and the first and second end fittings together, wherein the reinforcing element extends through a first one of the through-boreholes in the first end fitting; and
and an anchoring element that holds the reinforcing element in the first through-borehole, wherein the anchoring element has a wedge shape and is inserted into a central area of an end of the reinforcing element in the first through-borehole, wherein the anchoring element presses the reinforcing element outwardly firmly against a circumferential wall of the first through-borehole.
9. The surge arrester of claim 8 , wherein the reinforcing element is a solid cylindrical member.
10. The surge arrester of claim 9 , wherein the reinforcing element is a rod.
11. The surge arrester of claim 10 , wherein the reinforcing element comprises a glass-reinforced-plastic.
12. The surge arrester of claim 9 , wherein the reinforcing element is a cable.
13. The surge arrester of claim 8 , wherein the anchoring element splits the reinforcing element apart in its longitudinal direction.
14. The surge arrester of claim 13 , wherein the first through-borehole comprises a cylindrical section and a conical section extending from the cylindrical section toward a surface of the body opposite the varistor block.
15. The surge arrester of claim 14 , wherein the conical section has an oval cross-sectional shape.
16. The surge arrester of claim 15 , wherein the cylindrical section has a circular cross-sectional shape.
17. The surge arrester of claim 15 , wherein the cylindrical section has an oval cross-sectional shape.
18. The surge arrester of claim 8 , wherein the varistor block comprises one of a stack of a plurality of varistor blocks disposed between the first end fitting and the second end fitting.