Apparatus for measuring an electric current through a bus bar
US10837985B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2018 |
| Grant date | Nov 17, 2020 |
| Priority date | — |
| Expiry date | Jan 25, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring an electric current through a bus bar comprises a compensation coil and a magnetic field sensor. The bus bar has a through-hole dividing the electric current flowing through the bus bar into at least two partial currents flowing around the through-hole. The compensation coil is disposed in the through-hole and generates a compensation field. The compensation field compensates a plurality of magnetic fields generated by the partial currents and/or an external magnetic field such that a magnetic flux density of a resulting magnetic field at a predetermined position of the through-hole does not exceed a predetermined threshold. The magnetic field sensor is disposed in the through-hole and detects the magnetic flux density of the resulting magnetic field at the predetermined position. The magnetic field sensor emits an output signal corresponding to the detected magnetic field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.