A short-circuit detector includes: a first Rogowski coil configured to generate a first detection signal in accordance with a current that flows through a first arm due to a short circuit in a load; a second Rogowski coil configured to generate a second detection signal in accordance with a current that flows through the first arm due to a short circuit in the first arm or a second arm; a load short-circuit detection circuit configured to detect the short circuit in the load, based on the first detection signal; an arm short-circuit detection circuit configured to detect the short circuit in the first arm or the second arm, based on the second detection signal; and a short-circuit detection circuit configured to detect a short-circuit, based on: an output signal output from the load short-circuit detection circuit; and an output signal output from the arm short-circuit detection circuit.

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 sensor 1 according to the invention comprises: •at least two magnetic transducers 2, 3, each comprising at least one elongate coil 5, 6, forming a loop surrounding the primary conductor; •at least one loop closure mechanism allowing two ends of the coils 5, 6 of a transducer 2, 3 to be retained while providing: —a negative mechanical gap between the two ends of the coils 5, 6 closing each loop, along a first elongation axis Y of the coils 5, 6; an offset of each end of a coil 5, 6 of a loop relative to the other end of a coil of the loop, along an offset axis X; —a mechanical inversion of the offsets between the loops.

A current measuring device (1) includes two triaxial magnetic sensors (11, 12) that are arranged with a prescribed gap between the two triaxial magnetic sensors (11, 12) such that magnetic-sensing directions of the two triaxial magnetic sensors (11, 12) are parallel to each other, and a calculator configured to calculate a current (I) flowing in a measurement-object conductor (MC) based on detection results from the two triaxial magnetic sensors (11, 12) and a gap between the two triaxial magnetic sensors (11, 12).

There is provided a short circuit determination apparatus including: a sensor configured to detect, in a switching device that has a control terminal, a first main terminal, and a second main terminal, a temporal change of a main current flowing between the first main terminal and the second main terminal; and a short circuit determination unit configured to determine that the switching device is short-circuited, in a case where the temporal change of the main current is larger than or equal to a first threshold value, after a first timing after a control signal for driving the control terminal is turned on.

The present disclosure relates to an apparatus and method for compensating for an offset in switching current sensing in an improved method using a Rogowski coil and an Op-amp. According to the present disclosure, when a Rogowski current sensor and an Op-Amp integrator are used to sense a switching current of a motor driving inverter, a DC-DC converter, or the like, the fact that an offset value of an output of the integrator varies depending on a duty value of a pulse-width modulation (PWM) control signal is used, so that offset calibration software is applied to automatically generate an offset value table at the beginning of power up of a controller and compensate for a sensed value of the current in real time by referring to the value. As a result, there is no need to perform conventional manual tuning.

A test lead for an electrical meter is provided. The test lead comprises a flexible elongate member comprising a current sensing coil at least partially disposed about a flexible core along the length of the member. A first connector is disposed at one end of the member for coupling a respective end of the current sensing coil to a test port of an electrical meter. A second connector is disposed at an opposing end of the member for coupling a respective end of the current sensing coil to an electrically conductive member, to provide an electrical path, via the sensing coil, from the electrically conductive member to the first connector.

A flexible sensor configured to detect a physical amount of a measurement target in a state surrounding the measurement target includes a sensor cable configured to detect the physical amount of the measurement target and a holding portion on which a base end portion of the sensor cable is mounted, the holding portion having a groove portion in which a distal end portion of the sensor cable is fitted from a side surface.

A current measurement device (1 to 3) includes a first sensor (SE1) configured to detect a direct current magnetic field and a low-frequency alternating current magnetic field generated by a current (I) flowing through a measurement target conductor (MC), a hollow magnetic shielding member (12) that includes a cutout portion (CP2) into which the measurement target conductor is inserted and in which the first sensor is accommodated, a fixing mechanism (13) configured to fix the measurement target conductor such that a distance between a center of the measurement target conductor inserted into the cutout portion of the magnetic shielding member and the first sensor is a predetermined reference distance (r), and a first calculator (21) configured to calculate a current flowing through the measurement target conductor based on a detection result of the first sensor.

A current sensor includes a first component and a second component shaped to fit together to create a combined unit with multiple openings through the combined unit. The opening is bounded on a first side by the first component and on a second side by the second component. The first component and the second component are configured to be fitted together around current-carrying conductors passing through the openings. The first component includes first portions of an inductive energy harvesting device and a current sensing device, both proximal to the first side of the opening. The second component includes second portions of the inductive energy harvesting device the current sensing device, both proximal to the second side of the opening. The inductive energy harvesting device may include a split-core ferrite current transformer and the current sensing device may include a Rogowski coil.

An enclosed low temperature cofired ceramic current sensor with planar signal pads incorporating shield plates protecting an inner positioned circumference offset herringbone wound coil connected to a pair of bottom signal pads, and a central axis stacked power conductor connected to a pair of bottom power pads outside of the top and bottom shield plates.