Title:
METHOD AND APPARATUS FOR DEMAGNETIZING GENERATOR COMPONENTS PRIOR TO ELECTROMAGNETIC CORE IMPERFECTION TESTING OR EL-CID TESTING
Document Type and Number:
WIPO Patent Application WO/2013/059268
Kind Code:
A3
Abstract:
A method and apparatus for determining and for reducing magnetism in a generator stator core (20). The method includes extending one or more conductors (38) proximate the core, applying a polarity-reversing excitation voltage to the one or more conductors, and reducing an amplitude of the voltage over time, wherein the voltage causes current to flow in the conductors, the current generating a magnetic field that demagnetizes the core. The method and apparatus are useful for determining hot spots in the core.
Inventors:
METALA MICHAEL J (US)
YZELMAN WERNER (US)
YZELMAN WERNER (US)
Application Number:
PCT/US2012/060544
Publication Date:
June 26, 2014
Filing Date:
October 17, 2012
Export Citation:
Assignee:
SIEMENS ENERGY INC (US)
International Classes:
H01F13/00
Domestic Patent References:
| WO1982002803A1 | 1982-08-19 |
Foreign References:
| US20040042150A1 | 2004-03-04 | |||
| EP1895636A2 | 2008-03-05 | |||
| US20070278890A1 | 2007-12-06 | |||
| US20040000923A1 | 2004-01-01 | |||
| US4402032A | 1983-08-30 |
Attorney, Agent or Firm:
RYAN, Daniel J. et al. (170 Wood Avenue SouthIselin, New Jersey, US)
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