A current sensor system for accurately measuring an AC electrical current having frequencies up to 2 kHz, the system comprising: an electrical conductor (e.g. busbar) for conducting said AC current thereby creating a first magnetic field; a magnetic sensor device for measuring a magnetic field component or gradient; an object (e.g. a metal plate) having an electrically conductive surface arranged in the vicinity of said conductor for allowing eddy currents to flow in said surface, thereby creating a second magnetic field which is superimposed with the first magnetic field; wherein the magnetic sensor device is configured for determining the current as a signal or value proportional to the measured component or gradient. The metal plate may have an opening. The current sensor system may further comprise a shielding.

A three-phase current detection device is configured to be used with first to third conductors allowing respective three-phase currents to flow therethrough in a flow direction, and is configured to detect the three-phase currents. The three-phase current detection device includes a substrate, a grounding wiring provided on the substrate, first to third loop magnetic cores, first to third magnetoelectric conversion elements, and first to third grounding electrodes. The first to third loop magnetic cores are extended along first to third loop lines surrounding the first to third conductors, the first to third loop lines are on a plane perpendicular to the flow direction, the first to third loop magnetic cores have first to third magnetic gaps, respectively. The first to third magnetoelectric conversion elements are disposed in the first to third magnetic gaps, respectively. The first to third grounding electrodes are connected to the grounding wiring, contact the first to third loop magnetic cores, and press the first to third loop magnetic cores in first to third pressing directions perpendicular to the flow direction, respectively.

A sensor device for detecting voltage in a conductor cable includes a sense electrode to be disposed over a surface of the conductor cable to cover a sense region having a sense axial width and a sense circumferential length and a reference electrode to be disposed over the surface of the conductor cable to cover a reference region. The reference region has an axial position adjacent the axial position of the sense region and has a reference circumferential length greater than the sense circumferential length. The sensor device further includes a charge measurement circuit connected in series between the sense electrode and the reference electrode to measure a charge measurement and circuitry to compare the charge measurement to a threshold to detect a presence of the voltage in the conductor cable.

A current detection apparatus of an embodiment includes a coil pattern, a magnetic field detection element and a shielding layer. The coil pattern is configured with an arc-shaped planar coil and straight line portions parallel to each other extending from an end portion of the arc-shaped planar coil. The magnetic field detection element is arranged away from the coil pattern in a direction orthogonal to a plane of the planar coil and disposed to receive a magnetic field in a first direction generated by the coil pattern. The shielding layer is provided between the coil pattern and the magnetic field detection element and is provided with a slit portion.

A current sensor detects a current flowing through a current path. The current sensor includes plural sensor elements, and each sensor element has a current path, a magnetic detector, a first magnetic shield and a second magnetic shield. The magnetic detector faces a part of the current path. A part of the current path and the magnetic detector are positioned between the first and second magnetic shields. The second magnetic field, the current path, the magnetic detector and the first magnetic shield are stacked in order along a stacking direction in each sensor element. The plural sensor elements are disposed adjacently to each other in a direction perpendicular to the stacking direction. The current path has a facing part facing the magnetic detector, and a first bent part bending from the facing part toward the second magnetic shield.

Techniques are provided to facilitate current sensing recovery for imaging systems and methods. In one example, a device includes a detector configured to detect electromagnetic radiation and generate a detection signal based on the detected electromagnetic radiation. The device further includes a current sensing circuit configured to provide, based on the detection signal, a first signal. The device further includes a signal generator configured to provide a second signal to adjust a bandwidth associated with the current sensing circuit. The device further includes an imaging integration circuit configured to generate an image of at least a portion of a scene based at least in part on the first signal. Related methods and systems are also provided.

A current sensor includes a bus bar in which a current to be detected flows, a circuit board mounted with a magnetic detection element thereon to detect a strength of a magnetic field generated by a current flowing in the bus bar, and a housing including first and second housings provided in such a manner as to sandwich the bus bar and the circuit board therebetween in a plate thickness direction of the bus bar. The first and second housings include slide guide portions respectively which are relatively slidable in a sloping direction with respect to the plate thickness direction of the bus bar while abutting each other in the plate thickness direction of the bus bar.

Deterioration in transient response characteristics of a current sensor may cause overshoot or delay. Thus, it is difficult to achieve good transient response characteristics of a magnetic field. A current sensor is provided, including: a detection unit outputting a signal corresponding to a magnetic field generated by detection current flowing through a current path; a reception unit receiving the signal corresponding to the magnetic field; a filter unit filtering the signal received by the reception unit; and an output unit outputting an output signal indicating the detection current according to the filtered signal, wherein detection gain, as gain of magnetic flux density detected by the detection unit, has a gain fluctuation band that changes with an increase in a frequency of the detection current, and the filter unit has gain that cancels out the change in the detection gain in at least a part of the gain fluctuation band.

An intelligent electronic device (IED) that associates current measurements from wireless current sensors with voltages of a power line are described. For example, an IED may receive a first current measurement from a first WCS on a first phase of a power line. The IED may receive a first voltage quantity from a voltage sensing device on the first phase of the power line. The IED may determine a phase shift between the first voltage quantity and the first current measurement to use as a reference phase shift. The IED may receive a second current measurement from a second WCS on a second phase of the power line. The IED may associate the second WCS with a second voltage quantity based at least in part on the reference phase shift.

A method includes obtaining different measurements of voltages across terminals of a field device coupled to an I/O loop. The voltage measurements are associated with corresponding loop currents flowing through the I/O loop. The method also includes identifying a baseline loop resistance measurement of the I/O loop using the voltage measurements and the loop currents. The method further includes obtaining additional measurements of voltages across the terminals of the field device. The additional voltage measurements are associated with additional corresponding loop currents flowing through the I/O loop. The method also includes identifying additional loop resistance measurements of the I/O loop using the additional voltage measurements and the additional loop currents. In addition, the method includes detecting a problem with the I/O loop based on the baseline loop resistance measurement and the additional loop resistance measurements.