Device for detecting a fault in an AC supply
US9748760B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2015 |
| Grant date | Aug 29, 2017 |
| Priority date | — |
| Expiry date | Sep 15, 2035 |
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 comprising a detection circuit for detecting a fault in an AC supply to a load and providing a corresponding output. A disconnect circuit disconnects the load from the supply in response to an output from the detection circuit. The device also includes a generator of intermittent test pulses, and a test circuit coupled to the detection circuit and containing a first solid state switch. Each test pulse turns on the solid state switch for the duration of the test pulse so that a current simulating the fault flows intermittently in the test circuit and a corresponding output is provided by the detection circuit. The device further comprising means to disable the disconnect circuit in response to each test pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.