Differential protection device for a switchgear apparatus, and electric switchgear apparatus comprising one such device
US9780551B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2014 |
| Grant date | Oct 3, 2017 |
| Priority date | — |
| Expiry date | Feb 28, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/33
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A differential protection device is designed for an electric disconnecting apparatus, the disconnecting apparatus comprising at least one fixed contact suitable for being connected to a corresponding electrical conductor, at least one movable contact, between a closed position, the movable contact being electrically connected to the corresponding fixed contact in the closed position and electrically isolated from the corresponding fixed contact in an open position, and an actuator for activating opening of the movable contacts when a differential fault is detected. The differential protection device comprises a controller for controlling the actuator. The differential protection device further comprises measuring circuitry for measuring an electrical variable associated with the controller and inhibiting circuitry for inhibiting the controller when the measured electrical variable satisfies a predetermined criterion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.