Surge arrester and method of manufacturing a surge arrester
A surge arrester has a discharge column formed of a stack of a plurality of varistor disks. The stack is stabilized with a fiberglass material. The fiberglass material is preimpregnated with a resin and the fiberglass material has glass fibers with a maximum diameter of 8 μm. A surge arrester may be formed by wrapping a tape of such fiberglass material around a stack of varistor disks.
1. A surge arrester, comprising:
a discharge column formed with a plurality of varistor disks;
fiberglass material impregnated with resin disposed to stabilize said discharge column;
said fiberglass material having glass fibers with a maximum diameter of 8 μm twisted into bundles.
2. The surge arrester according to claim 1 , wherein said fiberglass material has a resin content of more than 21 percent by weight.
3. The surge arrester according to claim 1 , wherein said fiberglass material includes volatile substances, and a percentage of said volatile substances within said resin is less than 4 percent by weight.
4. The surge arrester according to claim 1 , wherein said fiberglass material is wrapped around said discharge column.
5. The surge arrester according to claim 4 , wherein said fiberglass material is a tape having a width that is narrower than a length of said discharge column.
6. The surge arrester according to claim 5 , wherein said tape is wrapped around said discharge column a plurality of times.
7. The surge arrester according to claim 1 , which further comprises a housing made of a material that is partly composed of silicone.
8. A method of manufacturing a surge arrester, the method comprising the following steps:
providing a fiberglass material impregnated with resin, the fiberglass material having glass fibers with a maximum diameter of 8 μm twisted into bundles; and
stabilizing a discharge column having a plurality of varistor disks with the fiberglass material.
9. The method according to claim 8 , which comprises providing the fiberglass material with a resin content of more than 21 percent by weight.
10. The method according to claim 8 , which comprises providing the fiberglass material with a resin having volatile substances, and wherein a percentage of the volatile substances in the resin is less than 4 percent by weight.
11. The method according to claim 8 , which comprises wrapping the fiberglass material around the discharge column.
12. The method according to claim 11 , wherein the fiberglass material is a tape having a width that is narrower than a length of the discharge column.
13. The method according to claim 11 , which comprises wrapping a tape around the discharge column a plurality of times.
14. The method according to claim 8 , which comprises providing a housing of a material made, at least in part, of silicone.
15. The method according to claim 8 , which comprises configuring the surge arrester for midrange-voltage applications.
16. A surge arrester, comprising:
a discharge column formed with a plurality of varistor disks;
fiberglass material impregnated with resin disposed to stabilize said discharge column;
said fiberglass material having glass fibers with a maximum diameter of 8 μm and said fiberglass material having a resin content of more than 21 percent by weight.