Lem Intellectual Property Sa

Liaisons Electroniques-mechaniques Lem S.a.

Liaisons Electroniques-mecaniques Lem Sa

Vinh Tho Vo

Arnaud Labbe

Gérard Lepine

An electrical current transducer comprising a housing, at least one magnetic core comprising an air gap and defining a central passage configured to receive a primary conductor carrying a primary current to be measured through the central passage, a magnetic field detector positioned at least partially in the air gap, and a grounding element. A lateral surface of the magnetic core is positioned against the grounding element without direct fixed attachment between the magnetic core and the grounding element, and the grounding element overlaps the magnetic core to an extent configured to ensure that a capacitive coupling (C) between the magnetic core and the grounding element is greater than a capacitive coupling (C) between the magnetic core and the magnetic field detector.

Electrical current sensor with grounded magnetic core

Open-loop electrical current sensor () for measuring the electrical current flowing in a primary conductor, comprising a magnetic circuit () with an air-gap (), and a magnetic field sensing device () positioned at least partially in said air-gap. The magnetic field sensing device comprises a circuit board (), a first magnetic field detector () mounted on the circuit board, and a second magnetic field detector (). The second magnetic field detector comprises a conductive coil formed on the circuit board, the output signals of the first magnetic field detector and the second magnetic field detector being adapted for connection to a signal processing circuit () generating an output signal representative of the primary electrical current.

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Meyrin, Switzerland

Vinh Tho Vo