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Lionel Cima

Cima, Lionel

Yohan Maniouloux

A device for measuring an amount of superparamagnetic material comprises a pair of measuring coils and a pair of compensating coils, wherein the coils of a pair are identical to each other. The device also includes at least one direct current generator, a low-frequency generator, and a high-frequency generator, the generators being coupled to the first and second pairs to inject into each of the coils a current having a DC component, a high-frequency component and a low-frequency component, such that the magnetic fields generated by the coils of the same pair are identical. The device also comprises a detector of a component of an electric voltage set at a mixing frequency, which is a linear combination of the first and the second frequency.

Device for measuring an amount of superparamagnetic material and use of such a device

Two-in-one coil current sensor

The invention relates to a member (O1) for measuring a magnitude representative of a common mode voltage (V) in an electrical network () or in an equipment (E), the network () or the equipment (E) comprising at least one first power conductor (C1) and a second power conductor (C2). The measuring member (O1) comprises a sensor formed by two resistive elements (R1, R2) which are intended to be arranged in a bridge between the two power conductors (C1, C2) and have resistance values which are identical to each other. The two resistive elements (R1, R2) are connected at a midpoint (T3). The sensor also comprises a measuring dipole (SH) connected to the midpoint (T3) and to a connection terminal intended to be electrically connected to a common conductor (Cc), of which the electrical network () or the equipment (E) has been equipped.

Member for measuring a common mode voltage in an electrical network and device for detecting a fault using such a member

The invention relates to a device (D) for detecting a fault in an electrical network (), comprising at least one electrical equipment (E) which is electrically connected to a first power conductor (C) and to a second power conductor (C), the electrical network () being provided with a common conductor (Cc). The device comprises a first measuring member (O) of the common mode voltage present on the power conductors (C, C) and a second measuring member (O) of a current flowing in the power conductors (C, C). The device also comprises a calculator (UP) configured to determine over a determined observation period a mixed energy (E) transported in the measurement region from the first variable (V) and the second variable (I). The invention also relates to an equipment, a localization system and a method for detecting a fault in an electrical network.

Device for detecting a fault in an electrical network, electrical network or equipment comprising such a device and method for detecting a fault

A member for measuring a variable representative of a common mode voltage in an electrical network a device. The network or the device includes at least a first power conductor and a second power conductor. The measuring member has two capacitive elements which are intended to be arranged in a bridge between the two power conductors and have capacity values that are identical to each other. The two capacitive elements are connected at a midpoint. The measuring member also includes a two-terminal measurement circuit connected on the one hand to the midpoint and on the other hand to a connection terminal intended to be electrically connected to a common conductor provided in the electrical network or device.

An electric circuit for measuring a current flowing in a conductor comprising: 2&#xd7;N coils, N being an integer greater than or equal to 2, connected in series together; and a common mode filtering element associated with each of the 2&#xd7;N coils, each filtering element being placed in parallel with the associated coil and being able to accomplish common mode filtering of the 2&#xd7;N coils, a core of the 2&#xd7;N coils having a relative permeability less than 10, and among the 2&#xd7;N coils, N coils being wound in a direction opposite to the winding direction of the N other coils.

Rogowski current sensor which is fast and immune to voltage drifts

Electrical circuit for measuring a current flowing in a conductor comprising: and wherein a core of the Rogowski-type coils of the first and second pairs has a relative permeability of less than 10 and wherein one coil of each pair comprises at least one multi-turn winding, the other coil of the pair comprising at least one multi-turn winding.

Very-wide-bandwidth current sensor

A current sensor includes at least one primary circuit that is intended to conduct the current to be measured, and a secondary circuit containing at least four Neel-effect&#xae; transducers, each having a coil and a superparamagnetic core. The current sensor is designed on the basis of a printed circuit board, the primary circuit including at least two distinct metal tracks that are composed of one and the same metal and connected to one another by a via made of a rivet, of a tube or of an electrolytic deposit of the same metal.

Neel effect&#xae; isolated DC/AC current sensor incorporated in a PCB

The present invention relates to a device for measuring a magnetic field and, more specifically, for measuring direct and/or alternating currents circulating in a primary conductor. The current sensoraccording to the invention comprises: &#x2022;at least two magnetic transducers, each comprising at least one elongate coil, forming a loop surrounding the primary conductor; &#x2022;at least one loop closure mechanism allowing two ends of the coilsof a transducerto be retained while providing: &#x2014;a negative mechanical gap between the two ends of the coilsclosing each loop, along a first elongation axis Y of the coils; an offset of each end of a coilof a loop relative to the other end of a coil of the loop, along an offset axis X; &#x2014;a mechanical inversion of the offsets between the loops.

Current sensor with magnetic field circulation

A device for magnetic measurement that includes a DC magnetic field sensor having at least four discrete elements, each of the discrete elements being constituted by at least one coil and a magnetic material without remanence, where the at least four discrete elements are substantially identical. The magnetic field sensor includes a first discrete element orientated in a given direction, and a second discrete element associated therewith to constitute a first differential pair. The second discrete element being orientated in parallel but in an opposite direction relative to the first discrete element. The device further including two other discrete elements constituting a second differential pair substantially identical to the first differential pair. The two other discrete elements being parallel to the orientation of the first differential pair but are respectively orientated in an opposite direction to the first and second discrete elements of the first differential pair.

Isolated DC current and voltage sensor with low crosstalk

A permanent or variable magnetic field circulation sensor including apparatus for magnetic excitation further including at least one elongated excitation coil extending around an elongated supple magnetic core and including a supple magnetic material with low relative magnetic permeability having a supple or flexible matrix in which magnetic particles are dispersed, an excitation current generation unit coupled to the excitation coil to generate an excitation magnetic field in the core over substantially the entire length of the coil, apparatus for measurement including: at least one magnetic measuring transducer magnetically coupled to the apparatus for magnetic excitation, a measuring unit connected to the magnetic measuring transducer and suitable for providing a measurement of magnetic field circulation in the core.

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Saint-Cyr-sur-Loire, France

Lionel Cima