Abstract: For monitoring an inverter that includes separate input-side connectors for multiple direct-current generators with regard to the occurrence of a critical fault current, differential currents in at last two pairs of input lines are measured separately in the inverter. The at last two pairs of input lines conduct the currents that are fed in at different input-side connectors, and all pairs of input lines in their entirety transmit all currents that are fed in at the connectors. The differential currents are compared with a limit value separately for each pair of input lines. A case of the limit value being exceeded is recognized as a fault. In addition, a sum of simultaneously occurring differential currents in all pairs of input lines is determined and the sum is compared with a further limit value, wherein a case of the further limit value being exceeded is also recognized as a fault.

Abstract: A disclosed example method involves receiving a first signal transmitted into a reservoir from a production installation in a formation at a wellsite, and determining an apparent resistance of the reservoir based on the first signal. A distance between a fluid extraction tool and a fluid distribution is determined based on the apparent resistance.

Abstract: Disclosed are a biosignal measurement device and a capacitively-coupled active electrode. The capacitively-coupled active electrode includes an electrode face configured to form capacitive coupling with a subject in a non-contact manner to detect a biosignal, and a pre-amplifier disposed on a rear side of the electrode face and embedded in a porous insulator.

Abstract: A current measurement circuit includes an integrator, first and second transformers, and a current measurement unit. The first transformer includes a first winding about a magnetic core. The magnetic core has an opening through which a current to be measured passes. The first winding is configured to generate a first current based on a first flux in the magnetic core. The second transformer includes second and third windings. The second winding is coupled to receive the first current from the first winding. The second winding has a terminal coupled to the third winding. The third winding is coupled to a first input of the integrator circuit. The output of the integrator circuit is operably coupled to provide an error current to the second transformer. The current measurement unit measures the current through the second winding of the second transformer.

Abstract: Devices, methods and systems are disclosed using a first magnetic field sensor of a first type and a second magnetic field sensor of a second type different from the first type. A signal from the first sensor may be used in a first magnetic field, range, and a signal from the second sensor may be used in a second magnetic field range.

Abstract: A semiconductor device includes an oscillator that oscillates at a specific frequency, a semiconductor integrated circuit that integrates a temperature sensor that detects a peripheral temperature, and a controller that is electrically connected to the oscillator and that corrects temperature dependent error in the oscillation frequency of the oscillator based on the temperature detected by the temperature sensor and a sealing member that integrally seals the oscillator and the semiconductor integrated circuit.

Abstract: An apparatus for measuring winding resistances of windings in a delta-connected transformer includes at least a first and a second DC current source connected each between the phase ends of a first and a second leg respectively of the primary side of the transformer and at least a third DC current source connected between two nodes of the secondary side of the transformer. Furthermore, a method for measuring a winding resistance of windings in delta-connected transformers includes the steps of applying a first and a second measuring current to each one of two corresponding legs, applying a third measuring current between two nodes of a pair of windings on the secondary side and measuring at least a winding resistance of the winding between said nodes on the secondary side of the transformer and/or the winding resistance of a leg of the primary side as soon as an inductive voltage drop in the windings substantially equals zero.

Abstract: A circuit configuration detects zero-crossings and/or a brownout condition. The circuit configuration contains a zero-crossing detection circuit, a brownout detection circuit, an isolation and digitization circuit connected to the zero-crossing detection circuit and the brownout detection circuit, and a filtering circuit connected to the isolation and digitization circuit. The single circuit configuration can be used for detecting zero-crossings of single-phase and multi-phase systems as well as ascertaining a brownout condition of either the single-phase or the multi-phase systems.

Abstract: Composite material sheets containing conductive fibers are laminated, and release films are interposed between the sheets so as to extend from one end to the center of the sheets. The sheets are heated under pressure to shape a composite material. Discrete conductive wires through which a measurement current is passed are connected to end surfaces of the respective layers in the composite material on the side on which the release films are interposed. A common conductive wire through which the measurement current is passed is connected to a surface of one of an uppermost layer and a lowermost layer at an end of the composite material opposite to the side on which the release films are interposed. A current is passed between the common conductive wire and the discrete conductive wires. Currents in the respective layers are sequentially or simultaneously measured using an ammeter.

Abstract: A method for detecting an open current transformer in an electrical power system includes measuring for a voltage value on a secondary side of a current transformer. The method continues with observing the voltage value for a predetermined waveform and initiating corrective action in the electrical power system upon detection of the predetermined waveform.

Abstract: An encoder includes a positional information generation unit configured to generate first positional information based on a detected signal which is output by a sensor unit, and an IIR filter unit configured to output second positional information obtained by performing filtering on the first positional information. In the IIR filter unit, a counter unit stores a predetermined high-order digit of the first positional information as a count value, and an input unit subtracts the count value from the first positional information to thereby generate input information. A computation unit generates an internal computation result based on delay information which is an internal computation result stored in a delay information storage unit, input information, and a predetermined filter coefficient, and generates output information on which filtering is performed. An output unit adds the count value and the output information to thereby generate second positional information.

Abstract: A sensor device analogical output signal shifting system including the sensor device including at least two detection cells adapted to equip a mechanical device and deliver at least two analogical output signals depending on behavior of the mechanical device. A shifter circuit selectively processes the analogical output signals and including at least a first part including at least one passive analogical component having a variable parameter and a second part including at least one passive analogical component having a variable parameter; and a control component for controlling the variable parameters of the passive analogical components, a variation of these variable parameters shifting at least one of the sensor device analogical output signals in the circuit. The circuit delivers at least two sensor device analogical output signals, including at least one shifted output signal including the first shifted analogical output signal and/or the second shifted sinusoidal signal of the sensor device.

Abstract: A measuring system for sensing vane positions that comprises a turbine, a target, and a bellows. The turbine includes a plurality of articulating vanes, with each vane being coupled to a sync ring that is configured to position the plurality of articulating vanes in accordance with a degree of rotation by the sync ring. The target is coupled to a first position of the turbine within a first region that is associated with a first vane of the plurality of articulating vanes. The bellows coupled to the turbine and configured to maintain a sensor reference point at a second position. The sensor reference point at the second position is maintained by the bellows in relation to the target at the first position across a gap.

Abstract: In at least one embodiment, an apparatus for detecting a phase sequence in a vehicle is provided. The apparatus includes a control module for being operatively coupled to a power grid for receiving an incoming power signal therefrom, the incoming power signal providing a first voltage and a second voltage in a vehicle. The control module is configured to determine a phase difference between the first voltage and the second voltage and to determine a signal frequency of the incoming signal to determine a country type for the power grid. The control module is further configured to control a number of switching devices to generate an output voltage signal based on the phase difference and the signal frequency to charge at least one battery on the vehicle.

Abstract: Described is an apparatus comprising: an input pad; an output pad; a wire, coupled to the input pad and the output pad, the wire positioned at a periphery of a semiconductor die, the wire extending substantially along a perimeter of the semiconductor die; and one or more diodes, coupled at various sections of the wire, and positioned along the perimeter of the semiconductor die and surrounding the semiconductor die.

Abstract: A voltage/current verifier computes, for each phase, a phase difference between phase voltage and phase current from the phase of phase voltage and the phase of phase current computed for each phase by a phase acquirer, and determines conformity if all of the computed phase differences are within a preset range. A current/current verifier computes phase differences between phase currents from the phase of phase current computed for each phase by the phase acquirer, and determines conformity if all of the computed phase differences are less than 180°. A reporting device reports that a current transformer is incorrectly placed on a power line unless both the voltage/current verifier and the current/current verifier do not determine conformity.

Abstract: Systems, devices, and methods for evaluating an earth formation. Methods may include inducing a current in the formation; measuring a time-dependent transient electromagnetic (TEM) signal induced by the formation responsive to the current; and estimating apparent resistivity values for each of a plurality of samples derived from the TEM measurement, wherein each sample corresponds to a discrete time window of the TEM measurement. Estimating the apparent resistivity values for each of the samples includes determining for each sample a simulated homogeneous formation that provides a best fit for the sample. The apparent resistivity values may be used to estimate distance to an interface. The apparent resistivity values or the estimated distance may be logged and the log displayed. The apparent resistivity values, the estimated distance, or the log may be used to conduct further operations in a borehole, including geosteering.

Abstract: A method of detecting faults in a solar power system includes monitoring at least one operating parameter including outputs from a solar module, inputs and outputs to a microinverter, and inputs and outputs of a power optimizer, comparing the operating parameter to at least one of an expected value or another operating parameter, using results of the comparing to determine if there is a fault event, analyzing a location of an entity in the system that generated the operating parameter to localize the fault event, and performing remedial action on a location of the fault event.

Abstract: A fluid measurement system (10, 110, 210) and method of fluid mix determination over a sampling length (25) in a well bore (12). A pulse generator is run in the well bore from which is suspended a cable (24) with two conductors having a length equal to the sampling length. A high frequency pulse is injected along the cable and from the detected response average propagation velocities over the various reflections are used to determine the mixture of fluids. Embodiments are described which improve the determination such as using a cable with sections of alternating impedance, helically wound cable, providing multiple signal generators, incorporating a mathematical model, analyzing the analog signal response, providing a reference cable and incorporating an optical distributed temperature sensor.

Abstract: Apparatus and methods for measuring current flowing through a conductor include a device comprised of a magnetically conductive loop having a plurality of strands and a magnetic field sensor. Each strand has a magnetically conductive material. The strands are configured to pass a magnetic field to a first magnetic field sensor that is positioned adjacent to an end of the first plurality of strands. The plurality of strands may be arranged in various patterns that allow the magnetically conductive loop to be more bendable or flexible than a current-clamp device.