Method and apparatus for supervising a digital protective relaying system
US4276605A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1979 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | Apr 13, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/044
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a method and apparatus for supervising a digital protective relaying system, a first type of electrical quantities in an electric power system, each having a certain magnitude, are detected, digitized and operated on in a data processing unit to check whether there is a fault in any of first input circuits adapted to receive the first type of electrical quantities. To check whether there is a fault in a second input circuit which normally receives a second type of detected electrical quantity having a substantially zero magnitude, one of the first type of electrical quantities is inputted into the second input circuit, and the data processing unit performs an operation on the output of the second input circuit and the outputs of the first input circuits except for that first input circuit corresponding to the one of the first type of electrical quantities which is inputted to the second input circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.