Protective relay apparatus
US4321681A · kind A · utility
29Cited by
16References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1979 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Sep 21, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Protective relay apparatus for electric power systems which logically relates the outputs of two algorithms to provide the fastest possible trip for the conditions of the post-fault voltage and current waveforms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.