System and method for inspection of a generator stator core step iron region with the rotor in-situ
US10274541B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2015 |
| Grant date | Apr 30, 2019 |
| Priority date | — |
| Expiry date | Jul 4, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/1263
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Eddy current inspection of the step iron region of a generator stator core lamina insulation is performed while the rotor is in situ, with inspection system (81). The system (81) excites the stator core (26) and then measures any eddy currents indicative of a damaged region. The inspection system carriage (42) and its pivoting extension arm (52) are inserted within the rotor gap (34) while the rotor (22) remains in situ within the generator (20). The EL CID system's eddy current sensing coil assembly (54) includes a Chattock coil (70), which is mounted in a coil housing (56, 58) that is in turn pivotally mounted on a distal end of the extension arm (52). A sensing surface (60) of the coil housing (56, 58) remains in abutting contact with the generator core circumference in the step iron region (32), despite the step-like profile of the core circumference in that region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.