Current measuring device for measuring the electrical current flowing in an electrical conductor electrically isolated from the current measuring device
US7876086B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2008 |
| Grant date | Jan 25, 2011 |
| Priority date | — |
| Expiry date | Feb 28, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A current measurement device is configured to measure electrical current in a primary conductor that is electrically insulated from the current measuring device. The current measuring device includes a transformer with a saturable magnetic core formed with a central aperture and a current measuring circuit. The electrical conductor in which electrical current is to be measured is disposed in the central aperture of the magnetic core. The current measuring circuit includes a current source driven by a voltage ramp generator that is connected to the secondary winding in a direction opposite the flow of electrical current in the primary conductor. When the magnetic flux in the transformer core is equal and opposite the magnetic flux generated as a result of the electrical current flowing in the primary conductor, the voltage of the voltage ramp generator is representative of the DC or AC electrical current flowing in the primary conductor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.