Relay supervision system
US5243336A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1990 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Aug 22, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H47/002
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A relay supervision system is disclosed to check the presence and operability both of a relay and the associated circuitry located at a position remote from the control unit which effects the supervision. The supervision is accomplished by pulsing the relay with energy at a volt-time integral less than that required to energize the relay and displace a contact set, but sufficient to cause current flow through the winding and its associated circuit components. If the relay includes two separate windings, each winding can be separately pulsed at different times, the relay state determined, and both windings effectively supervised without changing the position of the contact sets operated by the windings. Energy is saved by terminating current flow through the just-energized relay winding as soon as the relay contact set is driven to its desired position
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.