39results about How to "Improve current measurement accuracy" patented technology

The invention discloses an all-fiber current sensor consists of a 3x3 polarization-maintaining fiber coupler. One embodiment of the invention, a straight-through type interferometric all-fiber current sensor, comprises a light source, a 3x3 polarization-maintaining fiber coupler, fiber polarizers, a 1 / 4 fiber wave sheet and a transduction fiber ring. The light source is connected with one end of the 3x3 polarization-maintaining fiber coupler; the two ports of the 3x3 polarization-maintaining fiber coupler are respectively connected with two fiber polarizers; and the other ends of the two fiber polarizers are respectively connected with the transduction fiber ring by the 1 / 4 fiber wave sheet; one port of the 3x3 polarization-maintaining fiber coupler is vacant; and the rest two ports of the 3x3 polarization-maintaining fiber coupler are respectively connected with a signal processor by two photoelectric detectors. In addition, another embodiment of the invention, a reflection type interferometric all-fiber current sensor, also uses the 3x3 polarization-maintaining fiber coupler. The all-fiber current sensor avoids phase differences made artificially and makes the current transduction system woke more stably.

A current sensor includes a first conductor and a second conductor arranged so as to form current paths parallel to each other; a circuit board arranged such that a surface thereof is perpendicular to the current paths; and a first magnetoelectric transducer and a second magnetoelectric transducer arranged on the surface of the circuit board such that the first conductor is interposed therebetween. The first conductor, the second conductor, the first magnetoelectric transducer, and the second magnetoelectric transducer are located on a same plane.

The invention relates to a high-accuracy electronic compensated current transformer, and belongs to the field of current measuring. The compensated current transformer is composed of an iron core, a winding and an auxiliary circuit used for compensating a magnetizing current. The iron core is a nested structure composed of a detecting iron core and a shielding iron core, the detecting iron core detects the zero magnetic flux state of the iron core through the winding wound on the detecting iron core and then controls the auxiliary circuit to provide the excitation current necessary for the current transformer, so that the error source of the current transformer is eliminated, and accuracy of the current transformer is greatly improved. A 0.001-level high-accuracy current transformer which is insensitive to secondary loads and an open type current transformer with the accuracy degree superior to 0.01level can be developed by using the high-accuracy electronic compensated current transformer.

The invention belongs to the technical field of galvanic corrosion measurement for metal materials, in particular relates to a multi-channel galvanic corrosion measurement device. According to the multi-channel galvanic corrosion measurement device, an SOC (System on a Chip) processor structural design is adopted; the front end of an electrode connection cable is connected with an electrode; the rear end of the electrode connection cable is connected into a voltage / current measurement switching unit; two ends of a front end signal conditioning circuit are bridged with a reference source afterbeing electrically communicated with an A / D (Analog-to-Digital) conversion circuit; the front end of the front end signal conditioning circuit is electrically connected with the voltage / current measurement switching unit; the output end of the A / D conversion circuit is electrically communicated with a main control module after being connected in series with a multi-channel electric isolation unit; an SOC processor is arranged in the main control module; the main control module is electrically connected with a display module, a storage module and a communication module respectively, so that electric information control is realized; and a signal input by a reference electrode is incorporated into the front end signal conditioning circuit after being amplified, so that a signal processing system is formed. The multi-channel galvanic corrosion measurement device has the characteristics of simple overall structure, reliable principle, convenience for use and operation, accuracy in measurement data, flexibility for control and wide application range.

The invention provides a broadband current transformer. The broadband current transformer comprises a detection iron core (1), wherein a detection winding (2), a detection winding copper screen (3), an inner magnetic screen (4), an inner compensation winding (5), an outer magnetic screen (6), an outer compensation winding (7), an outer compensation winding copper screen (8), a secondary winding (9), a secondary winding copper screen (10) and a primary winding (11) are arranged outside the detection iron core (1) from an inner layer to an outer layer in sequence; compensation capacitors (13) are connected at two ends of the outer compensation winding (7) in parallel, and compensation capacitors (14) are connected at two ends of the secondary winding (9) in parallel; and the number of windings of the inner compensation winding (5) is equal to that of the outer compensation winding (7). According to the broadband current transformer, main error sources of the current transformer are eliminated, the capacitive error of the broadband current transformer is reduced, and the measurement accuracy of high-frequency current is improved.

The invention discloses a detection circuit for monitoring state of a current transformer, which is serially connected between the transformer and a microprocessor circuit, wherein a microprocessor is used for judging the working state of the existing current transformer according to signals from the detection circuit. The detection circuit is independent to a current signal collecting circuit and overcomes the disadvantage that a current collection signal is affected by a state signal of the current transformer, so that the current measurement precision of an intelligent circuit breaker is improved.

The invention discloses a transformer state detection device. The transformer state detection device is characterized in that according to internal distance changes under various working states of transformers, the internal resistance changes are converted into changes of level waveforms by the aid of independent detection circuits and a level conversion circuit, and the current working states of the transformers are judged according to different level waveforms. The invention further discloses a breaker with the transformer state detection device. Compared with the prior art, the transformer state detection device and the breaker have the advantages that disconnection faults of the transformers can be detected, internal resistance changes of the transformers caused by other faults can be detected accurately, and integral system safety can be improved greatly. The independent detection circuits are used, so that influences of transformer state detection on current signal sampling are eliminated, and current measurement precision of the intelligent breaker is improved.

A bus bar module equipped with a current sensor includes a first bus bar, a second bus bar, a substrate, and a first magnetoelectric transducer. The first bus bar has a first notch. The second bus bar has a second notch and is placed in parallel to the first bus bar. The second notch is provided at a position different from the first notch in an extending direction of the first bus bar. The substrate is fitted to both the first notch and the second notch. Further, the substrate is sandwiched between those side surfaces of the first bus bar and the second bus bar which are opposed to each other. The first magnetoelectric transducer is placed inside the first notch and fixed to the substrate.

An optical fiber current transformer includes a broadband light source, a depolarizer, a beam splitter, a temperature acquisition unit, a current acquisition unit, a modulation waveform generating unit, a data processing unit and a calculating compensation unit. The broadband light source is connected with the beam splitter by the depolarizer. A first output of the beam splitter is connected with the calculating compensation unit by the temperature acquisition unit. A second output of the beam splitter is connected with the data processing unit by the current acquisition unit. The data processing unit is connected with the calculating compensation unit. The calculating compensation unit is connected with the current acquisition unit by the modulation waveform generating unit. The optical fiber current transformer uses the temperature-current compensation curve in the calculating compensation unit to synchronously process the temperature and current, thereby improving the accuracy of real-time current measurement.

A current sensor includes a magnetic sensor including magnetoresistive sensors configured to detect induction fields generated by a measurement current passing through a current line, a magnetic field application unit configured to apply to the magnetoresistive sensors a magnetic field having a direction perpendicular to sensitivity directions of the magnetoresistive sensors; and a computing unit configured to calculate from an output of the magnetic sensor a compensation value for the output. The computing unit is configured to be capable of calculating the compensation value from the outputs of the magnetic sensor obtained in at least two states in which magnetic fields applied by the magnetic field application unit are different from each other.

The invention belongs to the technical field of electric energy quality analysis and discloses an online electric energy quality monitoring system based on an ARM and an FPGA. The online electric energy quality monitoring system comprises an electric energy quality analysis meter, a data collection server, a local monitoring terminal and a remote monitor terminal, wherein the electric energy quality analysis meter is connected with the data collection server, and the local monitoring terminal and the remote monitor terminal are respectively connected with the data collection server; the electric energy quality analysis meter comprises a voltage measurement structure, a first filter circuit, a current measurement structure, a second filter circuit, a frequency tracking module, an analog-digital conversion chip, an FPGA chip and an ARM processor; the voltage measurement structure is connected with the analog-digital conversion chip through the first filter circuit; the current measurement structure is connected with the analog-digital conversion chip through the second filter circuit; the analog-digital conversion chip is connected with the FPGA chip; the first filter module is connected with the FPGA chip through the frequency tracking module; and the FPGA chip is connected with the ARM processor.

The invention discloses a cable type fault detector. The cable type fault detector comprises a short-circuit fault indicator and a zero-sequence current mutual inductor. The short-circuit fault indicator comprises a power-taking current mutual inductor, a measuring current mutual inductor, a CT (Captive Test) power supply circuit, a phase current measuring circuit, a wireless communication module, an MCU (Microprogrammed Control Unit) and a zero-sequence current measuring circuit, wherein the power-taking current mutual inductor is connected with the power supply end of the MCU by virtue of the CT power supply circuit; the measuring current mutual inductor is connected with an I / O (Input / Output) port of the MCU by virtue of the phase current measuring circuit, and used for transmitting a detected phase current transmitting signal to the MCU; the zero-sequence current mutual inductor is connected with the A / D (Analog to Digital) sampling port of the MCU by virtue of the zero-sequence current measuring circuit, and used for transmitting a detected current transmitting signal to the MCU; the serial interface of the wireless communication module is connected with the I / O port of the MCU by virtue of an SPI (Single Program Initiation) bus. The cable type fault detector disclosed by the invention adopts a structural form with a plurality of current mutual inductors to carry out short-circuit and grounding fault detection, thereby effectively improving the current measuring precision and lowering the equipment start-up current.

Apparatus and methods provide a current sensor system including a plurality of current sensors positioned proximate a plurality of conductors. Each conductor is configured to carry a current to be measured. Each current sensor comprises one or more magnetic field sensing elements configured to generate a respective magnetic field signal indicative of a detected magnetic field. The plurality of current sensors includes a first number of current sensors and the plurality of conductors includes a second number of conductors such that the first number is at least one more than the second number. A controller is coupled to receive the magnetic field signal from each of the current sensors and, for each magnetic field sensing element, is configured to characterize a magnetic coupling between the magnetic field sensing element and each of the plurality of conductors.

The invention discloses a current calibration measurement method of a current transformer and a related device, and relates to the technical field of data processing, and the method comprises the steps: carrying out the preprocessing of operation and maintenance information, power data and temperature time sequence data; performing harmonic analysis based on the power data to obtain target harmonic analysis data; based on target harmonic analysis data, performing temperature influence change analysis by using the temperature time sequence data to generate calibration parameters; performing magnetic field interference analysis based on the operation and maintenance information to construct an error analysis model in combination with the power data, and generating a first error compensation value based on the error analysis model and the temperature influence change data; determining loss data based on the operation and maintenance information to determine a second error compensation value, and generating a target error compensation value based on the first and second error compensation values; and controlling the current transformer to perform current calibration measurement based on the calibration parameter and the target error compensation value. According to the invention, the measurement precision of the current transformer is improved, and the obtained current measurement result is more reliable.

The invention provides an intelligent molded case circuit breaker and a manipulation method. The intelligent molded case circuit breaker comprises an upper cover, a middle cover, an operating mechanism, a phase system, a base and an intelligent release; the intelligent release comprises a release cover, an intelligent release circuit board, a release base, a connection row, a power supply transformer, a measurement transformer, a magnetic flow unit and a release transfer reset unit. The intelligent molded case circuit breaker has the advantages as follows: (1) the circuit breaker has a doublebreak point structure, and through the design of a movable contact and a static contact in the phase system, the circuit breaker has the advantages of high closing reliability and high opening speed,thereby ensuring the use performance of the circuit breaker. (2) The opening and closing reliability of the circuit breaker is improved by the design of the intelligent release, comprising the designof the magnetic flow, a rocker, a reset member and a mechanism push rod and the like. (3) The intelligent release transformer adopts a double-coil structure, so that the current measurement accuracy is high, which is beneficial to realizing overcurrent release more accurately.

Apparatus and methods provide a current sensor system including a plurality of current sensors positioned proximate a plurality of conductors. Each conductor is configured to carry a current to be measured. Each current sensor comprises one or more magnetic field sensing elements configured to generate a respective magnetic field signal indicative of a detected magnetic field. The plurality of current sensors includes a first number of current sensors and the plurality of conductors includes a second number of conductors such that the first number is at least one more than the second number. A controller is coupled to receive the magnetic field signal from each of the current sensors and, for each magnetic field sensing element, is configured to characterize a magnetic coupling between the magnetic field sensing element and each of the plurality of conductors.

The invention relates to the field of a magnetic core fixing structure assembly of a Hall current sensor, in particular to a magnetic core air gap fixing structure assembly for a core passing type Hall current sensor. The magnetic core air gap fixing structure assembly is characterized in that a fixing hole or a positioning groove is formed in a single magnetic core with an air gap formed by lamination riveting and punching; a non-conductive metal sheet is riveted and punched or welded onto the upper top layer or the outermost upper and lower layers of the single magnetic core; the non-conductive metal sheet is welded onto the outer side surface or the top of the magnetic core air gap position by a single magnetic core with an air gap formed by winding; when the two single magnetic cores with the same dimension or the single magnetic cores with one or even air gaps and one fixing frame or framework is used, the two single magnetic cores with the air gaps are arranged on the upper and lower surfaces of the fixing frame or the framework; the even number of air gaps are in staggered arrangement or symmetrical distribution or uniformly divide the whole magnetic paths; the side surface of the fixing frame or the framework is provided with an insertion groove communicating the air gaps of the magnetic core; the conversion plate is inserted in the insertion groove; a Hall element arranged in the magnetic core air gap is directly connected with a printed circuit board or is connected with the printed circuit board through a conversion plate.

The invention relates to a flexible measuring device for direct current large current measurement. The flexible measuring device comprises an integrated flexible non-contact current probe, a signal conditioning circuit and a signal processing unit, the integrated flexible non-contact current probe comprises a flexible magnetic core, and a magnetic measuring element and a temperature measuring element are integrated in the flexible magnetic core. After an output signal of the integrated flexible non-contact current probe passes through the signal processing unit, an analog signal in linear relation with a to-be-detected current and a digital signal of the to-be-detected current are output; the invention has the advantages of high precision, wide frequency band, low cost, excellent sensitivity and anti-interference capability, and improved measurement precision.

In order to accurately measure three-terminal currents of a triode, a triode annealing effect and the neutron fluence under the pulse neutron irradiation, the invention provides a triode three-terminal current waveform measuring system and method, a triode annealing effect measuring system and method, and a neutron fluence measuring method. According to the invention, under the circumstance that the current of an emitter of a to-be-measured triode is fixed, the response to the pulse neutron by the three-terminal currents of the to-be-measured triode is measured and the bias of the triode is not affected by the photocurrent during the irradiation, so that accurate measurement of the triode annealing effect under the pulsed neutron irradiation and the neutron fluence in an unknown irradiation field.

A current sensor includes a magnetic sensor including magnetoresistive sensors configured to detect induction fields generated by a measurement current passing through a current line, a magnetic field application unit configured to apply to the magnetoresistive sensors a magnetic field having a direction perpendicular to sensitivity directions of the magnetoresistive sensors; and a computing unit configured to calculate from an output of the magnetic sensor a compensation value for the output. The computing unit is configured to be capable of calculating the compensation value from the outputs of the magnetic sensor obtained in at least two states in which magnetic fields applied by the magnetic field application unit are different from each other.

The invention relates to a method for determining a load current, which is based on conducting a calibration current in a particular manner and on particular calculation methods.

The invention discloses an all-fiber current sensor consists of a 3x3 polarization-maintaining fiber coupler. One embodiment of the invention, a straight-through type interferometric all-fiber current sensor, comprises a light source, a 3x3 polarization-maintaining fiber coupler, fiber polarizers, a 1 / 4 fiber wave sheet and a transduction fiber ring. The light source is connected with one end of the 3x3 polarization-maintaining fiber coupler; the two ports of the 3x3 polarization-maintaining fiber coupler are respectively connected with two fiber polarizers; and the other ends of the two fiber polarizers are respectively connected with the transduction fiber ring by the 1 / 4 fiber wave sheet; one port of the 3x3 polarization-maintaining fiber coupler is vacant; and the rest two ports of the 3x3 polarization-maintaining fiber coupler are respectively connected with a signal processor by two photoelectric detectors. In addition, another embodiment of the invention, a reflection type interferometric all-fiber current sensor, also uses the 3x3 polarization-maintaining fiber coupler. The all-fiber current sensor avoids phase differences made artificially and makes the current transduction system woke more stably.

An optical fiber current transformer includes a broadband light source, a depolarizer, a beam splitter, a temperature acquisition unit, a current acquisition unit, a modulation waveform generating unit, a data processing unit and a calculating compensation unit. The broadband light source is connected with the beam splitter by the depolarizer. A first output of the beam splitter is connected with the calculating compensation unit by the temperature acquisition unit. A second output of the beam splitter is connected with the data processing unit by the current acquisition unit. The data processing unit is connected with the calculating compensation unit. The calculating compensation unit is connected with the current acquisition unit by the modulation waveform generating unit. The optical fiber current transformer uses the temperature-current compensation curve in the calculating compensation unit to synchronously process the temperature and current, thereby improving the accuracy of real-time current measurement.

The invention relates to a high-accuracy electronic compensation type current transformer, which belongs to the field of current measurement. The invention consists of iron core, winding and auxiliary circuit for compensating excitation current. The iron core consists of a detection iron core and a shielding iron core to form a nested structure. The detection iron core detects the zero flux state of the iron core through the winding on the upper side, and then controls the auxiliary circuit to provide the excitation current necessary for the current transformer, which eliminates the error source of the current transformer and greatly improves the accuracy of the current transformer . By applying the invention, a 0.001-level high-accuracy current transformer that is insensitive to secondary loads and an open-type current transformer with an accuracy better than 0.01-level can be developed.

The invention provides a broadband current transformer. The broadband current transformer comprises a detection iron core (1), wherein a detection winding (2), a detection winding copper screen (3), an inner magnetic screen (4), an inner compensation winding (5), an outer magnetic screen (6), an outer compensation winding (7), an outer compensation winding copper screen (8), a secondary winding (9), a secondary winding copper screen (10) and a primary winding (11) are arranged outside the detection iron core (1) from an inner layer to an outer layer in sequence; compensation capacitors (13) are connected at two ends of the outer compensation winding (7) in parallel, and compensation capacitors (14) are connected at two ends of the secondary winding (9) in parallel; and the number of windings of the inner compensation winding (5) is equal to that of the outer compensation winding (7). According to the broadband current transformer, main error sources of the current transformer are eliminated, the capacitive error of the broadband current transformer is reduced, and the measurement accuracy of high-frequency current is improved.

A bus bar module equipped with a current sensor includes a first bus bar, a second bus bar, a substrate, and a first magnetoelectric transducer. The first bus bar has a first notch. The second bus bar has a second notch and is placed in parallel to the first bus bar. The second notch is provided at a position different from the first notch in an extending direction of the first bus bar. The substrate is fitted to both the first notch and the second notch. Further, the substrate is sandwiched between those side surfaces of the first bus bar and the second bus bar which are opposed to each other. The first magnetoelectric transducer is placed inside the first notch and fixed to the substrate.

The invention discloses a detection circuit for monitoring state of a current transformer, which is serially connected between the transformer and a microprocessor circuit, wherein a microprocessor is used for judging the working state of the existing current transformer according to signals from the detection circuit. The detection circuit is independent to a current signal collecting circuit and overcomes the disadvantage that a current collection signal is affected by a state signal of the current transformer, so that the current measurement precision of an intelligent circuit breaker is improved.

The invention relates to the technical field of Rogowski coils, in particular to a rigid opening and closing type Rogowski coil which comprises a left semi-annular shell, a right semi-annular shell and a Rogowski coil body composed of a left semi-annular coil body and a right semi-annular coil body, the left semi-annular shell and the right semi-annular shell are mutually connected in an involution manner, the left semi-annular shell and the right semi-annular shell are respectively overlapped in a staggered manner at involution connection parts at two ends, the left semi-annular coil is mounted in the left semi-annular shell, and the right semi-annular coil is mounted in the right semi-annular shell; when the left semi-annular shell and the right semi-annular shell are in a closed state, the left semi-ring coil and the right semi-ring coil are arranged in a front-back staggered mode and form a closed whole ring in the front-back projection direction. According to the invention, the current measurement precision of the open-close Rogowski coil is improved.

The invention discloses a transformer state detection device. The transformer state detection device is characterized in that according to internal distance changes under various working states of transformers, the internal resistance changes are converted into changes of level waveforms by the aid of independent detection circuits and a level conversion circuit, and the current working states of the transformers are judged according to different level waveforms. The invention further discloses a breaker with the transformer state detection device. Compared with the prior art, the transformer state detection device and the breaker have the advantages that disconnection faults of the transformers can be detected, internal resistance changes of the transformers caused by other faults can be detected accurately, and integral system safety can be improved greatly. The independent detection circuits are used, so that influences of transformer state detection on current signal sampling are eliminated, and current measurement precision of the intelligent breaker is improved.