Protection relay and process
US6031703A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1998 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Jan 27, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The protection relay comprises a processing unit and temperature sensors associated to conductors, an ambient temperature sensor, and setting devices connected to circuits which perform tripping functions. A first short delay tripping circuit supplies a tripping order to a relay if a value of the temperature variation of a conductor exceeds a first setting threshold. A second long delay tripping circuit supplies a tripping order to the relay if a value of the temperature difference between the temperature of a conductor and the ambient temperature exceeds a second setting threshold. The protection relay is used notably for trip devices and circuit breakers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.