Instrument and method for detecting partial electrical discharges
US8990035B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2011 |
| Grant date | Mar 24, 2015 |
| Priority date | — |
| Expiry date | May 15, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/1227
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An instrument (1) and a method for detecting partial electric discharges involve acquiring a discharge signal (10), for example picked up by a direct-measuring impedance device (7) through a broadband HF acquisition channel (18), and acquiring the discharge signal (10) in a narrowband LF acquisition channel (180) complying with regulations, using on the LF acquisition channel (180) a trigger controlled in slave mode by a trigger of the broadband HF acquisition channel (18); they also involve acquiring another discharge signal (32) picked up by an indirect-measuring impedance device (8) through a second narrowband LF acquisition channel (180A) and comparing digital signals (34, 34A) generated in the first and second LF acquisition channels (180, 180A), in order to generate a balanced digital signal (36) without components representative of common mode electrical signals present in the measuring circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.