Residual differential device equipped with a surveillance system for the electronic power supply
US4663690A · kind A · utility
5Cited by
10References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1984 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Oct 17, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/253
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The electronics of a residual differential device is powered by several sources derived from the electrical system (14, 16, 18). A supply anomaly detector (36) signals the failure of one of the supply sources caused, for example, by a break in one of the wires (14, 16, 18). The anomaly detector signals the break in this wire and sends a tripping order to the protection circuit breaker (10). Voltage in the phase conductors is monitored, and an alarm device is energized, for example, if one of the phase conductors is open.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.