Residual current device with double grounded neutral fault detection
US7242557B2 · kind B2 · utility
4Cited by
2References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 29, 2005 |
| Grant date | Jul 10, 2007 |
| Priority date | — |
| Expiry date | Aug 1, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/331
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A residual current device (RCD) senses a differential current flowing in A.C. mains supply live and neutral conductors and disconnects the supply from a load when the differential current exceeds a predetermined level. The device further includes a circuit for detecting a double grounded neutral fault in which current flows in an N-E loop formed by a double grounded neutral. The current is sensed as a differential current and detected as a correspondence between causing the current to flow and sensing the differential current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.