Conductive Corona Shielding Paper, In Particular For Outer Corona Shielding

Patent metadata

Field	Value
Publication number	US-2016374236-A1
Application number	US-201515122254-A
Country	US
Kind code	A1
Filing date	Feb 26, 2015
Priority date	Feb 28, 2014
Publication date	Dec 22, 2016
Grant date	—

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:
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.

2 . The corona shielding paper of claim 1 , wherein the particles have a core that is resistant to partial discharges, and the electrically conductive 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 . An electric machine, comprising:
a machine body, and a corona shielding system including a corona shielding paper comprising:
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.

9 . The electric machine of claim 8 , wherein the electric machine is a high-voltage machine.

10 . The electric machine of claim 8 , wherein the electric machine comprises an electric generator, an electric motor, a transformer, a bushing, or a cable.

11 . The electric machine of claim 8 , wherein the particles of the corona shielding paper have a core that is resistant to partial discharges, and the electrically conductive is resistant to partial discharges.

12 . The electric machine of claim 8 , further comprising reinforcing fibers in the corona shielding paper.

13 . The electric machine of claim 12 , wherein the reinforcing fibers have an organic or inorganic basis.

14 . The electric machine of claim 8 , wherein the corona shielding paper further comprises a woven fabric forming a stabilizing carrier.

15 . The electric machine of claim 8 , wherein the particles of the corona shielding paper are coated with a metal oxide.

16 . The electric machine of claim 8 , 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

• H02K3/40

  for high voltage, e.g. affording protection against corona discharges · CPC title

• H01B7/292

  using material resistant to heat · CPC title

• H02K3/30

  Windings characterised by the insulating material · CPC title

• H05K9/0073 Primary

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