Current Transducer For Measuring An Electrical Current
First Claim
1. Current transducer for measuring a current flowing through a cable, the current transducer comprising a head comprising at least two ferromagnetic cores enclosing the cable, each core having an air gap and a magnetic field sensor placed at the air gap, wherein the ferromagnetic cores are positioned approximately parallel to each other and spaced by a predetermined distance from each other along an axis and rotated by a predetermined angle of rotation around the axis with respect to each other, so that the air gaps of the ferromagnetic cores are situated at different angles.
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Abstract
The invention concerns a current transducer for measuring a current flowing through a cable, comprising at least one magnetic field sensor and an electronic circuit. The current transducer comprises a head with a ferromagnetic core optimized to reduce the effects of external magnetic fields. The invention further concerns a magnetic transducer comprising a magnetic field sensor and an electronic circuit. The electronic circuit comprises at least one current source, a transformer, a fully differential preamplifier coupled to the transformer, a phase sensitive detector coupled to the preamplifier and a logic block configured to operate the magnetic field sensor(s) to provide an AC output voltage. The magnetic field sensor(s) is preferably either a Hall element or an AMR sensor or a flux-gate sensor.
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17 Claims
- 1. Current transducer for measuring a current flowing through a cable, the current transducer comprising a head comprising at least two ferromagnetic cores enclosing the cable, each core having an air gap and a magnetic field sensor placed at the air gap, wherein the ferromagnetic cores are positioned approximately parallel to each other and spaced by a predetermined distance from each other along an axis and rotated by a predetermined angle of rotation around the axis with respect to each other, so that the air gaps of the ferromagnetic cores are situated at different angles.
Specification