Abnormality detecting apparatus for electric equipment, particularly for a rotating electric machine
US5828227A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 30, 1997 |
| Grant date | Oct 27, 1998 |
| Priority date | — |
| Expiry date | Apr 30, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An abnormality detecting method and apparatus for electrical equipment measures the frequency spectrum of a signal detected by a partial discharge sensor and detects a partial discharge signal having a frequency component in the neighborhood of a resonance frequency to detect the abnormality of the electrical equipment. The resonance frequency is determined on the basis of the electrical equipment and the measuring circuit. Where the electrical equipment is a rotating electric machine, the resonance frequency is determined on the basis of the length of the stator core, and a narrow bandpass filter circuit passes a frequency component around a resonance frequency to detect a partial discharge signal from the passed signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.