Protective relaying system
US4228476A · kind A · utility
13Cited by
12References
7Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 13, 1978 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Jun 13, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a protective system which operates in response to a plurality of state quantities, for example voltage and current, one of which being a digital code signal having a long code length and transmitted over a transmission circuit, the density of the code errors of the digital code signal is detected. A plurality of state quantities are processed by a processor including first means responsive to the digital code signal and second means not responsive to the digital code signal. Either one of the first and second means is selected according to the density of the code errors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.