Corona shielding system for an electrical machine

Patent metadata

Field	Value
Publication number	US-10673294-B2
Application number	US-201515511344-A
Country	US
Kind code	B2
Filing date	Aug 3, 2015
Priority date	Sep 25, 2014
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

The present disclosure relates to electrical machines. The teachings thereof may be embodied in a corona shielding system, especially an outer corona shielding system, for an electrical machine. For example, a corona shielding system may include: a polymeric matrix; particles disposed in the matrix, including a mica-coated core and a layer of metal oxide disposed on the core; and a surface functionalization material disposed on a surface of the particles for binding to the matrix.

First claim

What is claimed is:

1. A corona shielding system for an electrical machine, the system comprising:
a polymeric matrix;
particles disposed in the polymeric matrix, the particles comprising a mica-coated core and a layer formed by a metal oxide disposed on the mica-coated core; and
a surface functionalization material disposed on the metal oxide for forming covalent chemical bonds between the metal oxide and the matrix.

2. The corona shielding system as claimed in claim 1 , wherein the metal oxide comprises tin oxide.

3. The corona shielding system as claimed in claim 1 , wherein the polymeric matrix comprise plastic or resin.

4. The corona shielding system as claimed in claim 1 , wherein the surface functionalization material comprises an oligomeric structure.

5. The corona shielding system as claimed in claim 1 , wherein the surface functionalization material comprises a polymeric structure.

6. The corona shielding system as claimed in claim 1 , wherein the surface functionalization material has a
lower electrical polarity than an electrical polarity of the mica-coated core.

7. An electrical machine comprising:
a high-voltage machine;
and corona shielding system comprising:
a polymeric matrix;
particles disposed in the polymeric matrix, the particles comprising a mica-coated core and a layer formed by a metal oxide disposed on the mica-coated core; and
a surface functionalization material disposed on the metal oxide for forming covalent chemical bonds between the metal oxide and the matrix.

Assignees

• Siemens Ag

Inventors

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

Classifications

• H01B1/20

  Conductive material dispersed in non-conductive organic material {(organic macromolecular compounds or compositions C08)} · CPC title

• H02K3/30

  Windings characterised by the insulating material · CPC title

• H02K3/40 Primary

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

• H01B3/04 Primary

  mica · CPC title