Abnormality detecting method and apparatus for electric equipment, particularly for a rotating electric machine
US5680059A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 20, 1994 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Dec 20, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The abnormality detecting method and apparatus for electric equipment measure the frequency spectrum of a signal detected by a partial discharge sensor 9, and detect a partial discharge signal having a frequency component in the neighborhood of a resonance frequency determined on the basis of the electric equipment and its measuring circuit, then detect the abnormality of the electric equipment. In a rotating electric machine particularly, the narrow band filter circuit 23 passes a frequency component around a resonance frequency determined on the basis of the length of the stator core to detect a partial discharge signal from the passed signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.