Abstract: A method for monitoring the function of a sensor module including sensor which generates a measurement signal for a physical quantity to be determined and applies the measurement signal to an output terminal in an unchanged form or in processed form. In addition, a test signal is generated whose spectrum lies outside the spectrum of the measurement signal. The test signal is supplied at a place in the sensor from which it reaches the output terminal in unchanged form or in processed form only in the case of a functional sensor. An output signal present at the output terminal is compared with the test signal and a diagnosis signal is generated, which indicates whether the test signal is present at the output terminal. The test signal is filtered out of the output signal and the remaining signal is applied as the measurement signal at an output of the sensor module.

Abstract: A current detecting device includes an exciting coil (3) wound around a magnetic core (2) enclosing a conductor through which flows a measurement current, and an oscillator circuit (4) that generates a square wave voltage which is supplied to the exciting coil (3). Furthermore, the current detecting device includes a duty detector circuit (5) that detects the measurement current based on variation in the duty ratio of the square wave voltage output from the oscillator circuit (4), a frequency detector circuit (7) that detects an overcurrent of the measurement current based on the frequency of the square wave voltage output from the oscillator circuit (4), and an oscillation amplitude detector circuit (6) that detects an overcurrent of the measurement current based on the magnitude of the square wave voltage output from the oscillator circuit (4).

Abstract: A current sensor based on a Rogowski coil characterised in that it comprises a polygonal cross-section tube obtained from of one or more parts of rigid PCB, wherein the windings that form the Rogowski coil are located on the portions of rigid PCB which form the flat faces of said polygonal cross-section tube and wherein said one or more parts of rigid PCB are joined together by means of flexible zones which can bend in the form of an I, said polygonal cross-section tube being designed so that, during its use, the conductor whose current is required to be measured is situated along the tube's longitudinal axis.

Abstract: An improved measurement circuit includes a current transformer and an active feedback circuit operated as a negative resistance that matches the value of the winding resistance of the current transformer. An amplifier in the feedback circuit provides power to drive a secondary current through a sense resistor and the transformer winding resistance, reducing the most significant error source in a current transformer circuit by presenting a negative impedance to the current transformer. Combined with the positive resistance of the transformer's winding, the negative impedance results in a net burden of zero on the current transformer, which eliminates the need for the transformer having to provide power to drive the secondary current. This facilitates the use of smaller transformers while achieving reduced measurement errors. Thus, a single, compact measurement device may be used in a wide range of applications with high measurement performance.

Abstract: A combined measurement device for measuring current and/or voltage of an electrical conductor, comprising a supporting body, a current sensor housed inside the supporting body, and a voltage sensor located at least partially inside the supporting body. A shielding is positioned around the current sensor. The current sensor and the voltage sensor are mutually arranged so as the shielding shields at least partially both the current sensor and the voltage sensor against external electric field disturbances.

Abstract: The size of a current detecting apparatus is reduced by employing a small magnetic core, and problems caused by excessive heat generation and vibrations of a bass bar are prevented. In a current detecting apparatus, a current detecting bass bar includes a through portion penetrating through a hollow portion of a magnetic core, and plate-shaped terminal portions continuing from both sides of the through portion. The through portion is formed to have a thickness larger than that of the terminal portions.

Abstract: A harvesting and measurement device is operable in at least a normal operation mode, a demand measurement mode, and a fault measurement mode. In the normal operation mode, the device is able to harvest energy from an associated power line and monitor current and voltage conditions through a lower power circuit. In the demand measurement mode, harvesting elements of the circuit are disabled so as not to interfere with accuracy of demand current measurements. In the fault measurement mode, one or more Hall sensors are activated such that high currents can be accurately measured.

Abstract: A combined current transformer and metering system is described, having a securable case, two or more current transformers each having a core and secondary windings connected to a secondary circuit, wherein the transformers are mounted within the case. A wiring harness connects the secondary windings of the transformers with shorting current switches for short circuiting the secondary current circuit, and voltage switches for disconnecting a voltage, wherein both sets of switches are mounted on the case. A process of manufacturing the system is described, wherein the transformer cores are positioned within the case, the wiring is connected between the transformer cores and attachment hardware on an upper deck of the case, and insulation medium is inserted within the case. A base plate is described, having rails to hold the system and having a tab at one end, and apertures for a rod positionable between rails at a second end.

Abstract: An apparatus for decoupling a radio-frequency signal transmitted on a data transmission line having a first line element and a second line element, or for decoupling interference voltages includes: a tapping module, connected to the first and second line elements at a first tapping location of the data transmission line, for decoupling the radio-frequency signal or interference voltages; a current probe module, coupled to the first line element at a second tapping location of the data transmission line; and an output capable of being matched to different input impedances of a device connected to the output.

Abstract: A method for measuring a current level of an alternating current uses a current transformer having a measurement winding and a test winding. The resistance of the test winding is measured, the temperature of the test winding and therefore of the measurement winding is determined therefrom, and a value for a current level measured on the measurement winding is corrected using that temperature.

Abstract: A method and an array for measuring a primary current in a primary conductor that is magnetically coupled to a secondary conductor via a ferromagnetic core. In said method, a voltage having a specific amplitude is applied to the secondary conductor such that a secondary current flows for reversing the magnetization of the ferromagnetic core; the secondary current is measured while the magnetization of the ferromagnetic core is reversed in order to obtain a first measured value; the polarity of the voltage is reversed such that a secondary current flows for once again reversing the magnetization of the ferromagnetic core; the secondary current is measured while the magnetization of the core is reversed in order to obtain a second measured value; the primary current is calculated in accordance with the first and the second measured value, the polarity of the voltage being regularly reversed at a certain sensor frequency that is continuously varied.

Abstract: A method for producing a current metering device with current conductor optionally made of aluminum or aluminum alloy, which has a middle section in the form of a bar and two end sections with flattened areas, and is bent between one end section at a time and the middle section, a magnetic module which has a bushing which holds the current conductor, and two copper or copper alloy sleeves which are applied at least to parts of the end sections of the current conductor.

Abstract: A current sensor includes: a core having a groove where a conductor through which a current flows is inserted, with a direction of plate width aligned with a direction of depth of the groove; and a detector element arranged more closely to an opening of the groove than the conductor, with a direction of detection laid along a direction of a space of the groove, and detecting strength of a magnetic field. The core has a U-shaped portion whose surface facing the conductor is parallel to a surface defining the plate width, and narrow-width portions whose groove width and core width along the direction of the space gradually expands and gradually narrows, respectively, from both ends on the side of the opening of the U-shaped portion toward the side of the opening. Boundary portions between the U-shaped portion and the narrow-width portions are provided at a position facing the conductor.

Abstract: An apparatus for performing power detection includes a squarer module and a calibration module that is coupled to the squarer module, where the squarer module includes a first squarer and a second squarer. The first squarer is arranged to convert an input signal of the squarer module into a first squarer output signal. In addition, the second squarer is arranged to output a second squarer output signal while a predetermined voltage level is input into an input terminal of the second squarer. Additionally, the calibration module is arranged to compare a difference between the first squarer output signal and the second squarer output signal with a reference signal to generate a comparison signal, and to compensate the difference according to the comparison signal, so as to perform a calibration on the apparatus. A method for performing power detection is also provided, and can be performed by utilizing the apparatus.

Abstract: A power distribution monitoring system is provided that can include a number of features. The system can include a plurality of monitoring devices configured to attach to individual conductors on a power grid distribution network. In some embodiments, a monitoring device is disposed on each conductor of a three-phase network. The monitoring devices can be configured to measure and monitor, among other things, current and electric-field on the conductors. Methods of calibrating the monitoring devices to accurately measure electric-field are also provided. In one embodiment, a first monitoring device on a first conductor can transmit a calibration pulse to a second monitoring device on a second conductor. The second monitoring device can determine a degradation of the calibration pulse, and use that degradation to calibrate electric-field measurements around the conductor.

Abstract: Apparatus and methods are provided for electrical parameter measurements at points of interest, such as circuit breakers, machines, and the like. The devices which comprise of components that may require corrections, such as the errors induced by, but not limited to, the use of a split core mounted around a current carrier, and hence calibration coefficients are provided based on test, measurements and/or calculations respective of the devices. These coefficients may be stored in a database for retrieval when calibration of measurements received from a measuring device. In one embodiment at least one of the calibration coefficients is stored on the measuring device.

Abstract: Apparatus and method for measuring current drain and reporting power consumption using current transformer with primary windings made of low ohmic alloy, enabling the use of the secondary coil to power the sensing and reporting circuits eliminating the power wasted by AC-DC power adaptors used for the current sensors. The saving is substantial as the current sensors will not drain a current when the AC outlets are disconnected from a load or when the load is switched off. The apparatus using low ohmic alloy is extended to the structuring of terminals, including power pins, power sockets and combinations to provide a low ohmic sensing elements in AC plugs, outlets, adaptors and extension cables with multi outlets, dissipating the heat from the sensing elements by the plugs and the larger metal heat dissipation.

Abstract: A current flowing through a switching element (5) of a power supply is detected by an AC current transformer (8), and a capacitor (201) is charged by a voltage corresponding to the current. A reduction factor of the terminal voltage of the capacitor in an off period of the switching element (5) is calculated based on an amplification factor of the terminal voltage of the capacitor, an absolute value of an instantaneous value of an input power supply voltage, and an instantaneous value of a direct current output voltage, and the capacitor is discharged so that the terminal voltage of the capacitor decreases by the reduction factor in an off period of the switching element (5). A current flowing through an inductor (4) is estimated from the terminal voltage of the capacitor.

Abstract: To produce an insulated current sensor for slaving power devices in the field of avionics, use is made of a magnetic core through which there passes an element traversed by a current to be measured. The magnetic core comprises a secondary winding across the terminals of which are connected an oscillator and a measurement device. The cooperation of the oscillator and of the measurement device makes it possible to circumvent all the traditional drifting of current sensors.

Abstract: A current sensor includes: a core formed by U-shaped flat plates made of a magnetic body and stacked together; a flat plate-like conductor which is inserted on an interior side of a U-groove of the core and through which a current to be measured flows; a detection element which is arranged on the side of an opening of the U-groove in such a way that a detecting direction extends in a spacing direction of the opening, and which detects a strength of a magnetic field; a housing which supports the core, the conductor and the detection element; and a pair of spacing direction supporting portions which are provided at positions along the spacing direction on both sides of the detection element, in an opening-side end of the core, and which abut on the housing.

Abstract: An apparatus is provided for securing to and collecting power from an electrical conductor, including a current transformer comprising a core and an electrical winding that receives an induced current from magnetic flux generated according to alternating current present on the electrical conductor, and a clamping mechanism that attaches the apparatus to the electrical conductor. According to various aspects, apparatus may include a housing that encloses circuitry for monitoring conditions of the electrical conductor, where the circuitry includes one or more sensors, and wireless communications circuitry.

Abstract: A current sensor is disclosed. The current sensor includes a Rogowski coil disposed on a flexible printed circuit board with at least one active lead passing through the Rogowski coil.

Abstract: An instrument transformer for measuring properties of electricity in a power line is provided. The instrument transformer includes a cover section releasably secured to a base section. The cover section includes a first core segment encapsulated in a first encasement formed from a polymer resin. The base section includes a second core segment with a low voltage winding mounted thereto and a voltage transformer, all of which are encapsulated in a second encasement formed from a polymer resin. When the cover section and the base section are secured together, the first core segment adjoins the second core segment, thereby forming a current transformer having a core formed from the first and second core segments. A method for making the instrument transformer includes the connection of the cover section to the base section to form a passage through which a high voltage conductor may extend.

Abstract: An apparatus for online partial discharge testing includes a split-core radio-frequency current transformer sensor, an actuation subassembly, and a biasing member. The current transformer sensor has a first portion, a second portion, and a sensor hinge operably engaged between the first portion and the second portion. The actuation subassembly includes an elongate first member secured to the first portion of the current transformer sensor, a second member secured to the second portion of the current transformer sensor and configured to be movable relative to the first member, and a third member engaged with the second member and configured to translate along a length of the first member. The biasing member is configured to pivotally bias the first portion and the second portion of the current transformer sensor toward each other relative to the sensor hinge, with the biasing member secured relative to the first member.

Abstract: Some embodiments herein relate to a sensor package. The sensor package includes a printed circuit board with a laminar current conductor arranged on a first main surface of the printed circuit board. The sensor package also includes a sensor chip adapted to measure a current flowing through the laminar current conductor, wherein the sensor chip comprises a magnetic field sensor. The sensor chip is electrically insulated from the current conductor by the printed circuit board, and is arranged on a second main surface of the printed circuit board opposite to the first main surface. The sensor chip is hermetically sealed between the mold material and the printed circuit board, or is arranged in the printed circuit board and hermetically sealed by the printed circuit board.

Abstract: A current sensor comprises a first component comprising plural coils. Each coil comprises one or more turns printed on at least one planar surface of a respective substrate, and the planes of the coils are parallel to one another and are perpendicular to a longitudinal axis of the first component. A second component comprises soft magnetic material and has first and second planar faces that are at opposite ends of the first component and are arranged perpendicularly to and are intersected by the longitudinal axis of the first component.

Abstract: A circuit breaker having internal power monitoring and data signal generating apparatus, and a system for utilizing such a circuit breaker in a facility having a plurality of tenants served by branch circuits from a plurality of distribution panels. The circuit breaker radiates signals indicative of power consumption of the branch circuit protected thereby, together with a unique address identifier tied to one tenant. Electrical billings are based on summing all signals for each tenant. Changes to branch circuits during tenancy will not disturb correct billings since individual circuit breakers are associated with that tenant using power supplied by each branch circuit. Hence changes to branch circuits may be limited to modify building space locations served by the modified branch circuit, and need not be further modified to maintain correct billing in light of the circuit changes.

Abstract: A voltage detector having a voltage detection printed board including a board having a penetration hole that penetrates the board, a first pattern wire formed at a periphery of the penetration hole, a second pattern wire formed at the periphery of the penetration hole, and a plurality of through holes that penetrate the board between the first and second pattern wires. Also provided is a conductive casing in which the voltage detection printed board is fixed, wherein, when a conductor, in which AC voltage is generated, is disposed to pass through the penetration hole, the pattern wires act with the conductor to function as electrodes of a capacitor.

Abstract: A device including: a conductor through which a current to be measured flows; multiple coils arranged around the conductor; a first magnetic body provided to face one of end surfaces of each of the multiple coils and configured to magnetically short-circuit the multiple coils; and a second magnetic body provided to face another one of the end surfaces of each of the multiple coils, configured to magnetically short-circuit the multiple coils, and including through-holes through which coil wires from the multiple coils are passed, respectively, the through-holes being provided at positions facing the other end surfaces of the multiple coils, respectively.

Abstract: An electrical power meter for monitoring electrical power supplied to a load comprises a meter case, a plurality of current transformers within the meter case for sensing the electrical current in a plurality of line conductors of a power distribution system, and a plurality of pairs of terminals on the meter case for connecting the meter to the line conductors. The terminals of each pair are located on opposite sides of one of the current transformers, and a current transformer bus bar connects the two terminals and extends through one of the current transformers. A plurality of guides adjacent selected pairs of the terminals position lugs connecting line conductors to the selected pairs of terminals.

Abstract: A device and method are provided for monitoring voltage and current in a continuous conductor. A current sensor is configured to sense current in the continuous conductor. A voltage sense conductor is provided and a guided path is configured to bring the voltage sense conductor into contact with the continuous conductor at a pre-determined orientation. A communication interface is configured to receive information about a common reference voltage from a source, the source being external to the device. A voltage measuring circuit is configured to estimate voltage between a voltage sensed by the voltage sense conductor and the common reference voltage using the information about a common reference voltage.

Abstract: An exemplary current sensor operating in accordance with the principle of compensation includes a primary winding creating a magnetic field based on a current to be measured, a secondary winding generating a magnetic field compensating the primary winding based on a compensation current. The current sensor also includes a magnetic core, a terminating resistor connected in series to the secondary winding, and sensor means. A booster circuit is connected downstream of the sensor means and feeds the compensation current to the secondary winding via the terminating resistor. The booster circuit includes a switched mode amplifier with a pulse width and density modulator that operates based on pulse width and density modulation, turning the compensation current into a pulse width and density modulated current. The switched mode amplifier having a switching frequency that is high at when the compensation current is small and low when the compensation current is high.

Abstract: The size of a status indicator for monitoring a current in a power cable is reduced by integrating a bobbin for the secondary winding with a current transformer core and integrating a circuit board including output terminals with a current transformer assembly.

Abstract: A current or voltage sensor for use with a busbar has a support body having a proximal end juxtaposed with the busbar and a distal end spaced therefrom and a U-shaped conducting bar in the proximal end and having a pair of arms having free ends transversely engaging the busbar. A Rogowski coil in the proximal end is juxtaposed with the U-shaped conducting bar. A grounded screening element at the distal end is conductive and forms a chamber open toward the U-shape conducting bar. A source electrode has a proximal end engaging the U-shaped conducting bar outside the first chamber and a distal end in the chamber. An electrical field sensor in the first chamber is juxtaposed with the distal end of the source electrode.

Abstract: A high frequency current transformer (HFCT) sensor for detecting partial discharges produced by a component is disclosed. The HFCT sensor includes at least one electrically conductive pattern formed on a substrate, where the substrate comprises multiple segmented regions connected by intermediate regions for folding along multiple fold lines between the segmented regions to form the HFCT sensor. A system for monitoring at least one component of an aircraft wiring system is also disclosed. The monitoring system includes at least one of the HFCT sensors for detecting partial discharges produced by the aircraft wiring system component. The monitoring system further includes a data acquisition system configured to monitoring signals from the HFCT sensor(s).

Abstract: A test apparatus for a broadband telecommunication network. The apparatus includes a DC power source having a first electrical terminal and a second electrical terminal and a DC feeding bridge having a pair of inputs coupled to the first and second electrical terminals of the DC power source. The first electrical circuit having at least one circuit section having a transformer-coupled impedance formed by at least one transformer connected in parallel to a first impedance, and a pair of outputs that are adapted for establishing electrical contact with a device under test (DUT) configured to be disposed on a pair of transmission lines of the broadband telecommunication network.

Abstract: Devices, methods, and systems for non-invasive energy consumption monitoring are described herein. One or more device embodiments include a transformer configured to couple the device to a circuit conductor that is coupled to an additional device, a detection module configured to detect a change in a power signal over the circuit conductor, and a transmission module configured to transmit a unique signal associated with the additional device over the circuit conductor if the change in the power signal meets or exceeds a particular threshold.

Abstract: According to one aspect, embodiments of the invention provide a system for monitoring a plurality of circuit branches coupled to an input line, the system comprising a communication bus, a plurality of sensor circuits, each configured to be coupled to the communication bus and at least one of the plurality of circuit branches, wherein each sensor circuit is further configured to sample current in the at least one of the plurality of circuit branches, a controller configured to be coupled to the communication bus and the input line; wherein the controller is further configured to sample voltage on the input line, and wherein the controller is further configured to synchronize, via the communication bus, current sampling performed by the plurality of sensor circuits with the voltage sampling performed by the controller.

Abstract: A radio frequency sensor system includes a printed circuit board (PCB). The PCB includes a first exterior layer, a second exterior layer, a first interior layer, a second interior layer, and an inner perimeter that defines an aperture through the PCB. The PCB also includes a first loop. The first loop includes a first plurality of sensor pads coupled to a first plurality of vias by a first plurality of traces. The first plurality of sensor pads is arranged on the inner perimeter. The PCB also includes a second loop. The second loop includes a second plurality of sensor pads coupled to a second plurality of vias by a second plurality of traces. The second plurality of sensor pads is arranged on the inner perimeter. A core ring is embedded within the first interior layer proximal to the first plurality of sensor pads, the first plurality of vias, and the first plurality of traces. A center conductor, for carrying RF current, extends through the aperture.

Abstract: A system for sensing voltage in an isolated converter includes an input circuit isolated from an output circuit using a first transformer, the first transformer having a primary coil and a secondary coil, wherein the output circuit includes an output inductor and an output capacitor, and wherein the input circuit includes a power source that provides power to the output circuit through the first transformer; a feedback winding coupled to the output inductor to form a second transformer; and a monitor circuit that calculates a voltage across the output capacitor using a voltage across the feedback winding, a voltage across the primary coil of the first transformer, a turns ratio of the first transformer, and a turns ratio of the second transformer in order to provide feedback to control the input circuit.

Abstract: Apparatus and method for measuring current drain and reporting power consumption using current transformer with primary windings made of low ohmic alloy, enabling the use of the secondary coil to power the sensing and reporting circuits eliminating the power wasted by AC-DC power adaptors used for the current sensors. The saving is substantial as the current sensors will not drain a current when the AC outlets are disconnected from a load or when the load is switched off. The apparatus using low ohmic alloy is extended to the structuring of terminals, including power pins, power sockets and combinations to provide a low ohmic sensing elements in AC plugs, outlets, adaptors and extension cables with multi outlets, dissipating the heat from the sensing elements by the plugs and the larger metal heat dissipation.

Abstract: The invention relates to a current measuring device for detecting a current flowing through a power line, said device comprising: a magnetic loop for receiving the power line; an excitation device designed to magnetise the magnetic loop by means of a periodic signal; a first current sensor designed to detect an exciting current flowing in the excitation device on the basis of the periodic signal and/or the current to be detected; and a determination device that determines a shift of the detected exciting current on the current axis, said shift being caused by the current, and, as a result, deduces the intensity of the current to be detected. The invention also relates to a solar inverter and to a method for detecting a current.

Abstract: A current sensing device (1) for producing a voltage indicative of an alternating current flowing in a conductor (2) comprises a support element (5) within which a carrier element (11) is located. The carrier element (11) comprises a primary substrate (12) which is formed into a multi-channel arcuate configuration defining a plurality of longitudinally extending channels (13) with side walls (16) on which planar coils (17) are formed on respective opposite first and second major surfaces (14,15) of the primary substrate (12). The carrier element (11) is located and retained in the multi-channel arcuate configuration in a primary retaining recess (38) in the support element (5) with the planar coils (17) defining planes which extend radially from a main central axis (6) defined by the support element (5).

Abstract: A current and voltage detection printed board includes a board formed with a penetration hole; a first pattern wire formed at a periphery of the penetration hole; a second pattern wire formed at the periphery of the penetration hole; a plurality of first through holes that penetrate the board between the first and second pattern wires; a third pattern wire formed at the periphery of the penetration hole; a fourth pattern wire formed at the periphery of the penetration hole; and a plurality of second through holes that penetrate the board between the third and fourth pattern wires.

Abstract: A PeakPower Energy Management and Control System having one or more roll-lock snap-on current transformer power monitoring devices, each to avoid interrupting power when installing current and/or power monitors. Each roll-lock snap-on current transformer power monitoring device may be snapped onto existing power wires inside a power panel or near equipment being monitored without disconnecting any wires or turning off power. Each roll-lock snap-on current transformer power monitoring device may be utilized in standalone mode as well as within a PeakPower Energy Management and Control System in accordance with disclosed embodiments. Each roll-lock snap-on current transformer power monitoring device may communicate via the power lines (Power Line Controller) or communicate via wireless using an integrated microprocessor based RF transceiver.

Abstract: An apparatus (100) adapted to measure Alternating Current flowing through an electricity supply distribution unit (204) having a plurality of distribution cables (202). The apparatus (100) includes a plurality of current measuring devices (102), each of the current measuring devices (102), in use, measuring current flowing through one of the distribution cables (202), at least some of the current measuring devices (102) being mounted on a rigid/semi-rigid body (104), and a device configured to store and/or transfer information representing current measured by at least one of the current measuring devices (102).

Abstract: Closed-loop current sensor comprising a magnetic circuit, a magnetic field sensor, and a compensation circuit configured to generate a magnetic field opposing a magnetic field created by an electrical current to be measured flowing in one or more primary conductors (10) extending through a central opening (38) of the magnetic circuit. The magnetic circuit comprises a magnetic core (4) made of at least two core parts (28a, 28b) assembled together to form a substantially closed magnetic circuit, wherein a second branch (32) of the magnetic circuit comprises inner (40a, 40b) and outer (42a, 42b) wall portions joined by one or more lateral wall portions (46a, 46b, 46a?, 46b?) at least partially surrounding a cavity portion (44) receiving the magnetic field sensor (8) therein, the lateral and outer wall portions extending from one or both lateral edges of the inner wall portion.

Abstract: A system for monitoring power in accordance with the present disclosure has a transformer monitoring device that interfaces with two electrical conductors electrically connected to a transformer at a location on a power grid and to measure a first current and a second current through the first electrical conductor and the second electrical conductor, respectively. Further, the transformer monitoring device measures a first voltage and a second voltage associated with the first electrical conductor and the second electrical conductor, respectively, and the transformer monitoring device comprises two separate and distinct current measuring devices integral therewith. Additionally, the system comprises logic that calculates values indicative of power corresponding to the transformer based upon the first current and the first voltage and the second current and the second voltage.

Abstract: The invention relates to a method and a device (2) for galvanically isolated, AC/DC sensitive current measurement, comprising a measuring current transformer (4) having a primary winding (10) through which a current to be measured is flowing, a transformer coupling between the primary winding (10) and a secondary winding (14) via a shared magnetic flux (12) which forms a magnetic circuit having at least one segment (28) made from a material of a relative permeability, wherein in the secondary winding (14) a first partial voltage proportional to the change in time of the primary-side current is induced.

Abstract: In a wiring pattern formed on a printed circuit board, a current detection pattern having a predetermined area is formed in the wiring pattern for detecting a current, which flows to a subject body for current measurement, based on magnetic flux density generated by the current. The current detection pattern is formed of a same material as the wiring pattern. An excitation current is supplied to the current detection pattern for detecting the magnetic flux density. An output voltage outputted from the current detection pattern in correspondence to the excitation current and the magnetic flux density is measured. The current flowing to the subject body is calculated based on the magnetic flux density calculated from the excitation current and the output voltage.