# US 2017/0288487 A1 · Corona Shielding System And Electrical Machine

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- Number: US 2017/0288487 A1
- Document ID: US20170288487A1
- Status: Published application
- Kind: A1
- Application number: 15/511,306
- Filed: 2015-08-03
- Published: 2017-10-05
- Earliest claimed: 2014-09-25
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Bernhard Klaussner; Jiri Lang; Steffen Lang; Alexander Litinsky; Guido Schmidt; Christian Schulz-Drost; Klaus Schaefer; Christian Staubach
- Web page: https://patentgrep.com/patent/US20170288487A1

## CPC

- H02K 3/40: for high voltage, e.g. affording protection against corona discharges
- H01B 3/002: {Inhomogeneous material in general}
- H01B 3/04: mica
- H01B 3/10: metallic oxides (ceramics H01B3/12)
- H01B 3/12: ceramics
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

The present disclosure relates to electrical machines. The teachings thereof may be embodied in a corona shielding system, especially for an electrical machine, e.g., a high-voltage machine, such as a generator for generation of electrical energy, an electric motor, or another piece of electrical equipment having a relatively high rated voltage, e.g., a transformer or a bushing or a cable. A corona shielding system may include: a polymeric matrix; and filler particles comprising mica surrounded by a layer of at least one ceramic metal oxide. The filler particles may be distributed throughout the polymeric matrix.

## Claims

### Claim 1

A corona shielding system comprising:
a polymeric matrix; and
filler particles comprising mica surrounded by a layer of at least one ceramic metal oxide;
the filler particles distributed throughout the polymeric matrix.

### Claim 2 (depends on 1)

The corona shielding system as claimed in claim 1, wherein the layer completely surrounds the mica.

### Claim 3 (depends on 1)

The corona shielding system as claimed in claim 1, wherein the layer comprises aluminum oxide Al2O3, or silicon dioxide SiO2, or titanium dioxide TiO2, or a combination thereof.

### Claim 4 (depends on 1)

The corona shielding system as claimed in claim 1, further comprising:
a carrier material; and
at least one corona shielding paper bonded to the carrier material, wherein the at least one corona shielding paper includes the filler particles distributed throughout the polymeric matrix.

### Claim 5 (depends on 1)

The corona shielding system as claimed in claim 1, further comprising at least one corona shielding tape including an admixture of the filler particles and organic fibers.

### Claim 6 (depends on 1)

The corona shielding system as claimed in claim 1, wherein the system is deployed as at least part of an outer corona or at least part of an end corona shield.

### Claim 7

An electrical machine comprising:
a conductor bar under high voltage;
a lamination stack at ground potential; and
a corona shielding system separating the conductor bar and the lamination stack, the corona shielding system comprising:
a polymeric matrix;
filler particles comprising mica surrounded by a layer of at least one ceramic metal oxide;
the filler particles distributed throughout the polymeric matrix.