Surge arrester and method of manufacturing a surge arrester

Patent metadata

Field	Value
Publication number	US-10446296-B2
Application number	US-201815923661-A
Country	US
Kind code	B2
Filing date	Mar 16, 2018
Priority date	Aug 16, 2017
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Siemens Ag

Inventors

• Roggow Henrik

Classifications

• H01C7/102 Primary

  Varistor boundary, e.g. surface layers (H01C7/12 takes precedence) · CPC title

• C08J2300/24

  Thermosetting resins · CPC title

• H01C7/126

  Means for protecting against excessive pressure or for disconnecting in case of failure · CPC title

• H01C1/034 Primary

  the housing or enclosure being formed as coating or mould without outer sheath (H01C1/032 takes precedence) · CPC title

• C08J5/043

  with glass fibres · CPC title