The invention concerns a current detector (10) suited to measure a current circulating in an electrical conductor (12), the current detector (10) including: a probe (14) including: a converter (18) suited to convert the magnetic field induced by the current to be measured in the conductor (12) into a voltage, wherein the converter (18) is a magnetostrictive, piezoelectric composite material, and a circuit (16) for detecting the voltage converted by the converter (18).

The invention concerns a current detector (10) suited to measure a current circulating in an electrical conductor (12), the current detector (10) including: a probe (14) including: a converter (18) suited to convert the magnetic field induced by the current to be measured in the conductor (12) into a voltage, wherein the converter (18) is a magnetostrictive, piezoelectric composite material, and a circuit (16) for detecting the voltage converted by the converter (18).

A sensor device includes a silicon substrate having an active surface; a first sensing area disposed near a first edge of the active surface of the silicon substrate such that the first sensing area has at least one first magnetic sensing element is made of a first compound semiconductor material and contact pads; and a second sensing area disposed near a second edge of the active surface of the silicon substrate, such that the second edge is substantially opposite to the first edge, such that the second sensing area has at least one second magnetic sensing element made of a second compound semiconductor material and contact pads. A processing circuit is disposed of in the silicon substrate and is electrically connected via wire bonds and/or a redistribution layer with the contact pads of the first and second sensing areas.

A magnetic sensor includes a magnetic-field detector including magneto-resistance elements, and a shield. Since the feedback coil is disposed so as to overlap with the magnetic-field detector, and the shield is disposed so as to overlap with the feedback coil, the cancellation field of the feedback coil makes it difficult to cause magnetization saturation. The shield is annular in shape as viewed from a direction normal to the shield. This allows maintaining the magnetic-field shielding action of the shield to enhance the effect of shielding the magnetic field in a direction perpendicular to the sensitivity.

A current detection device includes a plurality of current detection units arranged in the current detection device. Each of the current detection units includes a bus bar that enables a current to be measured to flow therethrough, a magnetic sensor disposed at a position facing the bus bar, and a pair of shields disposed so as to sandwich the bus bar and the magnetic sensor in a facing direction in which the bus bar and the magnetic sensor face each other. The bus bars of the plurality of current detection units extend so as to be aligned to one another and, as viewed in the facing direction, the positions of the shield and the magnetic sensor of each of the current detection units in an extension direction of the bus bars differ from the positions of the shield and the magnetic sensor of the adjacent current detection unit.

The application provides an electrical system with online sampling and check function and its check method for high-voltage and medium-voltage electrical equipment, including electrical equipment, gas density relay, gas density sensor, valve, pressure regulating mechanism, online check contact signal sampling unit and intelligent control unit. The pressure is increased or decreased by the pressure regulating mechanism to enable the contact action of the gas density relay of electrical equipment. The contact action is transmitted to the intelligent control unit through the online check contact signal sampling unit. The intelligent control unit detects the alarm and/or blocking contact signal operating value and/or return value according to the density value of the contact action; the check of the gas density relay can be completed without maintenance personnel on site, which greatly improves the reliability of the power grid and the work efficiency, and reduces the O&M cost. At the same time, it also realizes the mutual self-inspection between gas density relay and gas density sensor, and further realizes the maintenance-free.

A current sensor system for measuring an AC electrical current, includes: a busbar having a beam shaped portion having a length and a width; a sensor device comprising two sensor elements spaced apart from each other in the width direction of the beam shaped portion. The sensor device is configured for measuring a magnetic field difference or a magnetic field gradient, and for determining the AC current based on said difference or gradient.

Electrical current transducer including an insulating body, a magnetic core comprising a central passage and a magnetic circuit gap, a magnetic field detector positioned in the magnetic circuit gap, and a sheet metal leadframe conductor arrangement comprising a primary conductor for carrying the current to be measured and secondary conductors for connecting the magnetic field detector to an external circuit, the primary conductor comprising a central portion extending through the central passage of the magnetic core, lateral extension arms extending from opposite ends of the central portion, and connection ends for connection to an external conductor, the secondary conductors comprising a plurality of conductors, each conductor comprising a sensing cell connection pad substantially aligned with the central portion of the primary conductor and a connection end for connection to the external circuit, the insulating body comprising an inner overmold portion surrounding a central portion of the primary conductor and forming a core guide positioning and insulating the magnetic core with respect to the leadframe conductor arrangement. The insulating body further comprises an outer overmold portion molded over the inner overmold portion, the magnetic core, magnetic field sensor, and a central portion of the leadframe conductor arrangement.

A current sensing correction method for a driving system is provided. Firstly, the detection values of a three-phase current are acquired through the measuring unit. When the three-phase current is maintained at the DC state, the DC values of the three-phase current are acquired and recorded as three-phase demagnetization values. When the detection values are zero, a d-axis current and a q-axis current are calculated according to the three-phase demagnetization values, a d-axis correction current command and a q-axis correction current command are calculated according to a proportional constant, the d-axis current and the q-axis current, and a three-phase demagnetization current is generated to the measuring unit according to the d-axis correction current command and the q-axis correction current command. When the demagnetization time reaches the first predetermined time, the three-phase demagnetization current is not generated.

A current sensing correction method for a driving system is provided. Firstly, the detection values of a three-phase current are acquired through the measuring unit. When the three-phase current is maintained at the DC state, the DC values of the three-phase current are acquired and recorded as three-phase demagnetization values. When the detection values are zero, a d-axis current and a q-axis current are calculated according to the three-phase demagnetization values, a d-axis correction current command and a q-axis correction current command are calculated according to a proportional constant, the d-axis current and the q-axis current, and a three-phase demagnetization current is generated to the measuring unit according to the d-axis correction current command and the q-axis correction current command. When the demagnetization time reaches the first predetermined time, the three-phase demagnetization current is not generated.