Convertor connection with asymmetry indicating means
US3968418A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1974 |
| Grant date | Jul 6, 1976 |
| Priority date | — |
| Expiry date | Dec 12, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/13
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A convertor connection for connection to a DC circuit includes current sensing members for forming a quantity corresponding to the direct current of the convertor connection. An indicating arrangement is provided for indicating asymmetrical operating conditions, which includes a first band pass filter connecting to the current sensing members which let through frequencies in a frequency band located between zero and the fundamental frequency of the AC component during undisturbed operation. When the output signal of the first filter exceeds a predetermined value, through a second filter an asymmetry indicating signal is emitted. The release of an output signal is prevented by a delay arrangement if the duration of the asymmetrical operating condition is less than a predetermined time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.