SURGE ARRESTER AND METHOD OF MANUFACTURING A SURGE ARRESTER

• US 20190057797A1
• Filed: 03/16/2018
• Published: 02/21/2019
• Est. Priority Date: 08/16/2017
• Status: Active Grant

• Current Assignee: Siemens Energy Global GmbH & Co. KG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: ROGGOW, HENRIK
• Granted Patent: US 10,446,296 B2
• Time in Patent Office: Days
• CPC Class Codes: C08J 2300/00 Characterised by the use of unspecified polymers
• CPC Class Codes: C08J 2300/24 Thermosetting resins
• CPC Class Codes: C08J 5/043 with glass fibres
• CPC Class Codes: H01C 1/034 the housing or enclosure being formed as coating or mould without outer sheath H01C1/032 takes precedence
• CPC Class Codes: H01C 17/02 adapted for manufacturing resistors with envelope or housing
• CPC Class Codes: H01C 7/102 Varistor boundary, e.g. surface layers H01C7/12 takes precedence
• CPC Class Codes: H01C 7/12 Overvoltage protection resistors series resistors structurally associated with spark gaps H01T1/16
• CPC Class Codes: H01C 7/126 Means for protecting against excessive pressure or for disconnecting in case of failure

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.

Claims

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 μ

m.

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 has a percentage of volatile substances within said resin of 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 μ

m; 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 a percentage of volatile substances in the resin of 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.