Measuring device for measuring differential current, trip module comprising one such measuring device and switchgear unit having one such module
US7567074B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2006 |
| Grant date | Jul 28, 2009 |
| Priority date | — |
| Expiry date | Nov 24, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/52
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device for measuring differential current designed to measure differential current in at least two current lines, comprising a first magnetic circuit designed to surround the current lines, forming a primary circuit of a transformer, a first secondary winding wound around said magnetic circuit and forming the secondary circuit of the transformer, a metal shielding surrounding the first secondary winding and the magnetic circuit. The device for measuring differential current in addition comprises at least one second secondary winding surrounding at least a part of the metal shielding. This second winding forms a second magnetic circuit of at least one second current sensor designed to supply an electric signal representative of a current flowing in at least one current line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.