Corona shielding system for an electrical machine
AssigneeSiemens Aktiengesellschaft
InventorsBernhard Klaussner, Jiri Lang, Steffen Lang, Alexander Litinsky, Guido Schmidt, Christian Schulz-Drost, Klaus Schaefer, Christian Staubach
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Abstract
The present disclosure relates to electrical machines. The teachings thereof may be embodied in a corona shielding system for an electrical machine. For example, a corona shielding system may include: an outer corona shield and an overhang corona shielding. The outer corona shielding and the overhang corona shielding may comprise a first corona shielding material having a nonlinear field strength-dependent electrical resistance.
Claims10
A corona shielding system for an electrical machine, the system comprising:
- an outer corona shielding;
- and
- an overhang corona shielding;
- wherein both the outer corona shielding and the overhang corona shielding comprise a first corona shielding material having a nonlinear field strength-dependent electrical resistance;
- wherein both the outer corona shielding and the overhang corona shielding comprise a second material having a different electrical resistance from the first corona shielding material;
- and
- the first corona shielding material has an associated electrical resistance in a working range from 0.1 to 0.3 kV/mm of 104 to 107 Ωm;
- wherein the first corona shielding material includes a matrix and a filler, the filler comprising partial discharge-resistant mica particles with average particle size of no more than one millimeter.
An electrical machine comprising:
- a set of windings;
- an electrical insulator disposed at least on the set of windings;
- an outer corona shield shielding the insulator;
- and
- an overhang corona shield shielding the insulator;
- wherein both the outer corona shielding and the overhang corona shielding comprise a first corona shielding material having a nonlinear field strength-dependent electrical resistance;
- wherein both the outer corona shielding and the overhang corona shielding comprise a second material having different electrical resistance from the first corona shielding material;
- and
- the first corona shielding material has an associated electrical resistance in a working range from 0.1 to 0.3 kV/mm of 104 to 107 Ωm;
- and
- wherein the first corona shielding material includes a matrix and a filler, the filler comprising partial discharge-resistant mica particles with average particle size of no more than one millimeter.
Dependencies are inferred from the claim text.