Corona Shielding System, In Particular Outer Corona Shielding System For An Electrical Machine

Patent metadata

Field	Value
Publication number	US-2016374237-A1
Application number	US-201515122271-A
Country	US
Kind code	A1
Filing date	Feb 25, 2015
Priority date	Feb 28, 2014
Publication date	Dec 22, 2016
Grant date	—

Abstract

A corona shielding system for an electric machine, for example a high-voltage machine, such as a generator, for generating electrical energy, an electric motor or else other electric operating means having a relatively high rated voltage, such as transformers, bushings, cables, etc, is disclosed. The corona shielding system may include a filler mixture including both planar and spherical particles. Therefore, the electrical conductivity, which is good in the presence of only planar particles in two spatial directions but is very poor in the third, can be adjusted anisotropically in a targeted manner.

First claim

What is claimed is:

1 . A corona shielding system for an electrical machine, the corona shielding system comprising:
a filler in a polymeric matrix, the filler comprising both planar and spherical particles that are resistant to partial discharges and electrically conductive.

2 . The corona shielding system of claim 1 , wherein the polymeric matrix is produced from at least one of a thermoset, a thermoplastic, or an elastomer.

3 . The corona shielding system of claim 1 , the particles comprising:
a core that is resistant to partial discharges, and a coating that is resistant to partial discharges and is electrically conductive.

4 . The corona shielding system of claim 1 , wherein the spherical particles and the planar particles are contained in the filler approximately in a ratio of 1:3.

5 . An electrical machine, comprising:
a plurality of machine components; and a corona shielding system arranged proximate at least one of the machine components, the corona shielding system comprising: a filler in a polymeric matrix, the filler comprising both planar and spherical particles that are resistant to partial discharges and electrically conductive.

6 . The electrical machine of claim 5 , wherein the polymeric matrix of the corona shielding system is produced from at least one of a thermoset, a thermoplastic, or an elastomer.

7 . The electrical machine of claim 5 , wherein the particles of the corona shielding system comprise:
a core that is resistant to partial discharges, and a coating that is resistant to partial discharges and is electrically conductive.

8 . The electrical machine of claim 5 , wherein the spherical particles and the planar particles of the corona shielding system are contained in the filler approximately in a ratio of 1:3.

9 . The electrical machine of claim 5 , wherein the electrical machine is a high-voltage machine.

10 . The electrical machine of claim 5 , wherein the electrical machine is a generator or an electric motor.

Assignees

• Siemens Ag

Inventors

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

Classifications

• H02K3/30

  Windings characterised by the insulating material · CPC title

• C08K3/22

  of metals · CPC title

• H02K3/40 Primary

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

• C08K3/36

  Silica · CPC title

• H05K9/0073 Primary

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