Conductive corona shielding paper, in particular for outer corona shielding

Patent metadata

Field	Value
Publication number	US-10736249-B2
Application number	US-201515122254-A
Country	US
Kind code	B2
Filing date	Feb 26, 2015
Priority date	Feb 28, 2014
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A corona shielding paper for use in a corona shielding system for an electric machine, e.g. a high-voltage machine, may be produced by compacting partial discharge-resistant, planar, conductive particles but can include both reinforcement fibers and a woven fabric.

First claim

What is claimed is:

1. A corona shielding paper, comprising:
conductive particles including:
planar particles coated with an electrically conductive coating, and
globular particles admixed with the planar particles, the globular particles providing a selected anisotropic electrical conductivity,

wherein the conductive particles have a substantially monomolecular outer surface layer formed from a functionalizing agent, and
wherein the substantially monomolecular outer surface layers of adjacent conductive particles are coupled to each other by chemical interactions.

2. The corona shielding paper of claim 1 , wherein the particles have a core that is resistant to partial discharges, and the electrically conductive coating is resistant to partial discharges.

3. The corona shielding paper of claim 1 , further comprising reinforcing fibers in the corona shielding paper.

4. The corona shielding paper of claim 3 , wherein the reinforcing fibers have an organic or inorganic basis.

5. The corona shielding paper of claim 1 , comprising a woven fabric forming a stabilizing carrier of the corona shielding paper.

6. The corona shielding paper of claim 1 , wherein the particles are coated with a metal oxide.

7. The corona shielding paper of claim 1 , wherein the particles are coated with a doped metal oxide.

8. The corona shielding paper of claim 1 , wherein the substantially monomolecular outer surface layer comprises an alkoxysilane.

9. The corona shielding paper of claim 1 , wherein the substantially monomolecular outer surface layer comprises at least one epoxy group or amino group.

10. The corona shielding paper of claim 1 , wherein the substantially monomolecular outer surface layer comprises silica nanoparticles.

11. An electric machine, comprising:
a machine body, and
a corona shielding system including a corona shielding paper comprising conductive particles including:
planar particles coated with an electrically conductive coating, and
globular particles admixed with the planar particles, the globular particles providing a selected anisotropic electrical conductivity,
wherein the conductive particles have a substantially monomolecular outer surface layer formed from a functionalizing agent, and
wherein the substantially monomolecular outer surface layers of adjacent conductive particles are coupled to each other by chemical interactions.

12. The electric machine of claim 11 , wherein the electric machine is a high-voltage machine.

13. The electric machine of claim 11 , wherein the electric machine comprises an electric generator, an electric motor, a transformer, a bushing, or a cable.

14. The electric machine of claim 11 , wherein the particles of the corona shielding paper have a core that is resistant to partial discharges, and the electrically conductive coating is resistant to partial discharges.

15. The electric machine of claim 11 , further comprising reinforcing fibers in the corona shielding paper.

16. The electric machine of claim 15 , wherein the reinforcing fibers have an organic or inorganic basis.

17. The electric machine of claim 11 , wherein the corona shielding paper further comprises a woven fabric forming a stabilizing carrier.

18. The electric machine of claim 11 , wherein the particles of the corona shielding paper are coated with a metal oxide.

19. The electric machine of claim 11 , wherein the particles of the corona shielding paper are coated with a doped metal oxide.

Assignees

• Siemens Ag

Inventors

• Eder Florian
• Klaussner Bernhard
• Lang Jiri
• Lang Steffen
• Litinsky Alexander
• Schmidt Guido
• Schulz-Drost Christian
• Schaefer Klaus
• Staubach Christian

Classifications

• H01B3/52 Primary

  wood; paper; press board · CPC title

• H02K3/02

  Windings characterised by the conductor material · CPC title

• H01B7/295 Primary

  using material resistant to flame · CPC title

• H01B7/292

  using material resistant to heat · CPC title

• H05K9/0073 Primary

  Shielding materials (H05K9/0003 takes precedence) · CPC title