Device for detecting a fault in an AC supply
US8964340B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2012 |
| Grant date | Feb 24, 2015 |
| Priority date | — |
| Expiry date | Apr 9, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/335
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device for detecting a fault in an AC supply comprises a circuit (CT, 100) for detecting a fault in an AC supply to a load (LD) and providing a corresponding output (IO), and an electromechanical switch means (SOLI, SWI) to disconnect the load from the supply if said output persists for at least a certain period of time. The device includes a generator (30) of intermittent test pulses each simulating a fault. In certain embodiments the duration of each test pulse is less than said certain period of time, and the circuit includes means (D2) for providing a visual and/or audible indication in response to the detection of test pulses by the detecting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.