30 results about "Rogowski coil" patented technology

The application relates to the field of high-density power integration, in particular to a PCB embedded power module with a buried planar Rogowski coil. The PCB embedded power module provided by the application comprises a power PCB board, a laminated structure, the laminated structure having a plurality of conductive layers and a plurality of insulating layers which are alternately stacked; a power chip which is embedded in the laminated structure of the power PCB board and is electrically connected with at least part of the conductive layers; and a planar Rogowski coil which is embedded in the laminated structure of the power PCB board and is used for sensing the current of the power chip; wherein at least part of the conductive layers of the laminated structure form a containing space through a connecting structure, and the planar Rogowski coil is buried and integrated in the containing space and is electrically isolated from the conductive layers. The application replaces the traditional spiral coil with the planar Rogowski coil by adopting the PCB buried integration method, and high-precision detection of the chip switching transient current of the PCB embedded power module is realized.

This invention discloses an intelligent enclosed jet-type fuse, comprising an insulating protective shell and a fuse tube composed of multiple stacked insulators. The top of the fuse tube is connected to an umbrella-shaped inlet terminal, and the bottom is fixed by a base. The base integrates a sensing unit and an intelligent circuit board. A fuse assembly is snapped into the fuse tube, and its surface has small holes with variable cross-sections filled with quartz sand. The bottom end is connected to the base. The sensing unit includes a temperature sensor, a vibration sensor, and a Rogowski coil for real-time monitoring of contact temperature, vibration signal, and input current. The circuit board integrates an MCU control module, a LoRa wireless communication module, etc., which can wirelessly transmit monitoring data to a gateway. The insulating protective shell is equipped with aviation plug terminals. The fuse tube is installed through a fixing plate with connecting pieces. The upper and lower contacts adopt a petal-shaped structure to increase the contact area. This fuse integrates overcurrent fusing and intelligent monitoring, and has remote status perception and fault alarm functions.

The present application relates to the technical field of fault detection, and relates to a relay contact fault identification method based on wavelet denoising and a support vector machine, comprising the following steps: S1, constructing a current signal acquisition and double-channel reconstruction circuit: a Rogowski coil is sleeved on an output loop of a relay contact, and a differential voltage signal is inducted and output by the Rogowski coil; S2, respectively adopting a first wavelet base and a second wavelet base to perform multi-scale wavelet decomposition, threshold denoising and wavelet reconstruction on a complete current digital sequence and a transient current digital sequence; S3, extracting time domain statistical features from the complete current digital sequence after denoising, extracting time-frequency energy features from the transient current digital sequence after denoising, and outputting a fault category of the relay contact after classification and decision by a support vector machine classifier. The present application overcomes the inherent contradiction that a single acquisition channel is difficult to simultaneously consider slow-changing contact components and transient disturbance components in terms of dynamic range and denoising strategy.

The application discloses a railway signal cable safety monitoring device and method, which comprises an outdoor cable current and temperature acquisition unit, a wireless data transmission unit based on a railway special wireless frequency band and a monitoring and diagnosing host. The acquisition unit adopts a Rogowski coil sensor to acquire the current and the body temperature of the cable armor, is powered by traction return current and is compatible with external power supply, and is matched with a low-power consumption design to reduce energy consumption; the wireless transmission unit adopts narrowband communication technology and combines with a relay node to build a stable transmission channel; and the monitoring and diagnosing host is based on a Qt framework and a BP neural network, stores data through a MySQL database, visually displays monitoring results and locates faults such as insulation damage. The application realizes real-time monitoring of a signal cable full path, solves problems such as a traditional monitoring blind area, power supply difficulty and inaccurate fault positioning, and improves railway operation and maintenance efficiency and transportation safety.

A Rogowski coil applied to distribution network traveling wave current acquisition belongs to the field of traveling wave current acquisition equipment. It comprises a ring-shaped winding framework (2), a secondary side coil (3) is wound on the winding framework (2), and a primary side coil (4) is further arranged at the winding framework (2), characterized in that a magnetic core (6) is arranged in the winding framework (2), at least one opening is arranged on the circumference of the magnetic core (6), and the winding angle of the secondary side coil (3) along the circumference of the winding framework (2) is less than 360°. In the Rogowski coil applied to distribution network traveling wave current acquisition, at least one opening is arranged on the circumference of the magnetic core, so that the magnetic core meets the mutual inductance coefficient of the distribution network traveling wave current, and the magnetic saturation during measurement is avoided, meanwhile, the two coil joints of the secondary side coil do not overlap on the surface of the winding framework, which is more helpful to meet the requirement of inter-turn capacitance and further meet the frequency bandwidth during sampling.

A live-line verification device and method for high-voltage instrument transformers are disclosed. The device includes a signal acquisition module, a signal processing module, a data transmission module, a control module, and a display module, all electrically connected in sequence. The signal acquisition module employs a voltage divider voltage sensor and a Rogowski coil current sensor to accurately acquire secondary-side voltage and current signals. The signal processing module uses second-order RC low-pass filtering, adjustable-gain instrument amplification, and high-sampling-rate analog-to-digital conversion to achieve interference filtering and signal optimization. The control module incorporates an error calculation algorithm and a Fourier harmonic analysis algorithm to accurately calculate the ratio difference and angle difference. The method, based on the aforementioned device, achieves live-line verification of high-voltage instrument transformers through standardized connection, acquisition, processing, calculation, and display steps.

The application discloses a plug-and-play intelligent power monitoring device and a working method thereof, and belongs to the technical field of power monitoring of distribution boxes. The device comprises a shell. A monitoring module and a communication module are arranged in the shell. A power supply interface and a sensing signal interface are arranged outside the shell. The power supply interface is electrically connected with an external power supply, the monitoring module and the communication module respectively. The sensing signal interface is electrically connected with a flexible Rogowski coil and the monitoring module respectively. The monitoring module is electrically connected with the communication module, and is used for collecting power parameter data and generating fault diagnosis results. Through modular integration, standard interfaces and flexible sensing design, the plug-and-play deployment of the monitoring device in a temporary power distribution scene, second-level fault alarm and real-time remote data transmission are realized, the monitoring efficiency is significantly improved, the deployment cost is reduced, and the information island problem among different platforms is solved.

The application relates to a Rogowski coil and a current measuring device. The Rogowski coil comprises a coil body and a joint assembly; the joint assembly comprises a first joint piece, a second joint piece and an adhesive layer; the first joint piece comprises a fixed main body and a first protruding part; the fixed main body is provided with a first fixed hole; one end of the coil body is inserted into the first fixed hole and is in contact with the first protruding part; the coil body is spaced apart from the inner wall of the first fixed hole and forms a first cavity; and the first cavity is provided with the adhesive layer; the second joint piece comprises a joint main body and a second protruding part; the joint main body is provided with a second fixed hole; one end of the coil body, which is away from the fixed main body, is inserted into the second fixed hole and is in contact with the second protruding part; the coil body is spaced apart from the inner wall of the second fixed hole and forms a second cavity; and the second cavity is provided with the adhesive layer. The Rogowski coil is easy to assemble, the connection between the joint assembly and the coil body is reliable and high, and the risk of loosening is small.

The application relates to the technical field of temporary grounding devices, in particular to a high-performance temporary grounding state detection and early warning device, which comprises an insulating grounding rod, a grounding head arranged at the upper end of the insulating grounding rod, a wiring board arranged at the rear side of the grounding head, a connecting piece arranged on the wiring board through bolts, a connecting line arranged at the lower end of the connecting piece, a state detection box plate arranged at the lower end of the connecting line, a central controller arranged in the state detection box plate, a Rogowski coil and a current coil arranged on the connecting line in an up-down distribution mode at the rear side of the central controller, an integrator connected to the signal output end of the current coil, the integrator being used for restoring the waveform of the measured current, data processing modules connected to the signal output ends of the Rogowski coil and the integrator, a voltage coil connected in parallel to the data processing modules, and current measurement data output received by the data processing modules being input into the central controller; the application has the advantages of safety, reliability and the capability of timely detecting the real-time grounding state of the temporary grounding device.

A current measurement device with a shunt resistor of a resistive core with an opening and measurement leads, a Rogowski coil with electrical contacts surrounding the resistive core, conductive layers on first and second sides of the resistive core, one or more insulative layers between the conductive layers and the Rogowski coil, the current measurement device configured to combine signals from the shunt resistor and the Rogowski coil. The current measurement device may have a Rogowski coil on a flexible substrate at least partially wrapped around the shunt. A current measurement device has a rigid substrate, vias filled with a conductive material through the rigid substrate, conductive layers on the top surface and the bottom surface connecting to the vias to form a Rogowski coil structure, one or more insulative layers directly on the coil structure, a shunt resistor directly on the one or more insulative layers.

The application discloses a kind of intelligent transformer current monitoring method and system for smart grid, belong to the field of power system automation.The method comprises: in transformer outlet end, the first original signal of Rogowski coil output and the second original signal of Hall sensor output are synchronously acquired;First current data and second current data are generated by integral restoration and low-pass filtering, differential amplification and temperature compensation respectively;According to real-time current amplitude, full-range dynamic is divided into low-range area, fusion area and high-range area;In fusion area, dynamic weight coefficient is calculated based on logistic function and two-way current is weighted and fused, second current data is used in low-range area, and first current data is used in high-range area;When steady state and current are in low-range area or fusion area, first current data is corrected in real time by integral drift based on second current data.The application is suitable for online monitoring and protection of smart grid transformer.

The utility model provides a kind of high voltage cable fault location device, it is related to power system fault diagnosis and protection technical field, the device includes host computer and rogowski coil, host computer includes mainboard, and mainboard includes main MCU, deputy MCU and FLASH memory;Rogowski coil is used to collect current signal in high voltage cable;Mainboard is connected with rogowski coil, for receiving current signal, and when current signal meets preset condition, trigger signal is generated;Deputy MCU is used to temporarily store current signal, and after receiving trigger signal, current signal is transferred to FLASH memory;Main MCU connects deputy MCU and FLASH memory. Current signal is temporarily stored by deputy MCU and under the control of trigger signal, current signal is transferred to FLASH memory, main MCU controls the transfer and reading of current signal, realizes the efficient collection and storage of high voltage cable fault transient traveling wave signal, improves the real-time and integrity of data acquisition, avoids data loss, thereby improves the accuracy and reliability of fault location.

This invention relates to a method for arc length calibration and dynamic fault location of transmission lines based on real-time feedback of suspension angle. The method includes: setting up multiple distributed monitoring nodes along the transmission line within each span; calculating the actual arc length of the conductor within each span; obtaining the equivalent path length of traveling wave propagation between adjacent distributed monitoring nodes; calculating the fault location using a two-end traveling wave location formula; outputting the tower segment number where the fault occurs and the distance to the nearest tower, and reporting this to the monitoring center. This invention significantly improves positioning accuracy, eliminates path errors caused by sag, achieves closed-loop adaptive system operation, and can cope with sudden weather changes and line condition changes during heavy load operation without manual intervention; assists maintenance personnel in determining the patrol range and improves on-site handling efficiency; and utilizes a dual-range Rogowski coil current sensor design to simultaneously handle both low-resistance short-circuit large signals and high-resistance grounding weak signals, expanding the system's fault detection applicability.

This invention relates to the field of automatic control technology, and more specifically, to a constant-speed output control method for a magnetic drilling motor based on dynamic current feedback. The magnetic drilling motor is an embedded permanent magnet synchronous motor driven by a three-phase inverter. The method includes the following steps: Step 1: Simultaneously setting a tunnel reluctance current sensor and a PCB-embedded Rogowski coil on each power bridge arm of the three-phase inverter; Step 2: Constructing a fractional-order extended state observer based on the reconstructed quadrature-axis voltage value reconstructed according to the DC bus voltage and the space vector pulse width modulation duty cycle, and outputting a speed feedback signal and an equivalent disturbance voltage compensation signal; Step 3: The speed control loop generates a quadrature-axis current reference value based on the difference between the speed setpoint and the speed feedback signal, thereby achieving constant-speed output control of the magnetic drilling motor. This invention reduces unnecessary heat generation and energy loss, and extends the continuous operation time of the equipment.

The present application relates to a short-circuit protection device of a power conversion device. To reduce an increase in cost and a large size of the power conversion device due to short-circuit protection in a case where a plurality of switching elements are connected in parallel. A short-circuit protection device of a power conversion device that supplies power to a load via a plurality of switching element sections connected in parallel is provided. The short-circuit protection device has a short-circuit determination section that outputs a cutoff instruction signal for stopping on-off driving of the plurality of switching element sections in a case where it is determined that there is a short-circuit failure in the plurality of switching element sections using a Rogowski coil that outputs a detection signal indicating a detection result using a sum of currents detected flowing through two or more of the plurality of switching element sections. In the short-circuit protection device, a distance between return lines of adjacent Rogowski coils is long.

A portable magnetic particle inspection and verification device includes a flexible Rogowski coil sensor module, a signal integration and filtering module, an analog-to-digital conversion and processing module, a timer detection module, a display and human-machine interaction module, a data storage module, a power management module, and a communication module. The flexible Rogowski coil sensor module senses the rate of change of current in the measured conductor; the signal integration and filtering module converts the electrical signal into an analog voltage signal; the analog-to-digital conversion and processing module calculates the effective value and peak value of the current and generates current waveform data; the display and human-machine interaction module displays the current waveform, numerical value, and timing results; the data storage module stores the data and uploads it to a remote server via the communication module; and the power management module provides a stable power supply. This invention overcomes the shortcomings of existing technologies, solving the problems of poor portability, insufficient accuracy, and limited functionality in existing equipment, and achieves integrated high-precision current measurement and timing verification.

This utility model discloses a Rogowski coil tension buffer fully automatic winding machine, including a wire supply unit, a wire feeding unit, a winding unit, a wire traction unit, a transmission unit, and a frame unit for fixing these units. The wire supply unit includes guide wheels that guide the coil skeleton to be wound to the winding shaft. The wire feeding unit feeds the enameled wire through the differential speed of the wire feeding driven pulley and the winding driven pulley. The winding unit guides the enameled wire to perform a winding motion and winds the coil at the wire outlet. The wire traction unit includes upper and lower transmission pulley assemblies, through which the wound Rogowski coil is pulled to the unloading area for unloading. The transmission unit provides power transmission to the wire feeding unit and the winding unit. The advantage of this utility model is that the elastic buffer assembly suppresses tension fluctuations during the winding process.

The application discloses a lightning current measurement and tripping rate correction method based on multi-source information fusion of a power transmission line, belongs to the technical field of power line state measurement and testing, and realizes accurate measurement of lightning current through symmetrical collection of double Rogowski coils; on the basis, multi-source data such as lightning current parameters, tower structure parameters and line corridor environment parameters are fused, the fusion precision of the measurement data is optimized in combination with an asymmetric cloud model and an improved Yager evidence combination rule, dynamic weight calculation is realized further through game theory comprehensive empowerment and punishment-incentive type variable weight theory, and finally dynamic correction of the lightning tripping rate of the power transmission line is completed. The application solves the problems of single lightning current measurement and insufficient calculation precision of the tripping rate of the existing power transmission line, and can effectively improve the accuracy of lightning protection monitoring of the power system.

The application relates to a method for preparing a single-atom catalyst based on a microsecond pulse discharge system and belongs to the technical field of catalysts. The pulse discharge system comprises a capacitor group, an air switch and a discharge cavity which are sequentially connected through wires to form a closed loop, the capacitor group is connected with an external power supply, a Rogowski coil connected with an external oscilloscope is arranged on the wire between the capacitor group and the discharge cavity; the discharge cavity is respectively connected with electrodes at two ends and is internally filled with a sample powder; the repeatability of a pulse discharge process and the uniformity of current distribution are realized through the design of the inner and outer diameter sizes of the discharge treatment cavity, and pulse discharge with a period of 100 microseconds is carried out; the application further provides a method for preparing a single-atom catalyst based on the pulse discharge system, the method is that a carrier sample loaded with a metal salt is filled into the inside of the discharge cavity, pulse discharge treatment is carried out for several times, and a single-atom catalyst is obtained, and the preparation efficiency of the single-atom catalyst is significantly improved.

This application relates to a multi-rate selection device for online detection of surge arresters. The device includes: an input interface module for receiving positive / negative signals from a Rogowski coil and outputting a differential input signal; a signal conditioning module for integrating and filtering the differential input signal and outputting a differential conditioned signal; a multi-rate amplification and selection module including at least two amplification channels with different gains, the input terminals of each amplification channel being connected in parallel to the signal conditioning module for receiving the differential conditioned signal; a multi-channel differential analog switch, whose multiple differential input terminals are respectively connected to the output terminals of each amplification channel, and whose differential output terminal is used to output the ADC input signal; an analog-to-digital converter module for converting the ADC input signal into digital data; and a microcontroller module for dynamically selecting and activating one of the amplification channels based on the digital data. This application can solve the problem of limited dynamic range in range acquisition schemes, thereby improving measurement accuracy.

This application relates to the fields of explosion-proof equipment for mining and power distribution equipment, and discloses a live-indication type intelligent mining cable entry device. The device includes a pressure plate, a pressure plate, a live-indication sensor, a rubber sealing ring, a connecting joint, fastening bolts, and clamping bolts. The live-indication sensor is nested inside the pressure plate, and a rubber protective pad is installed below the sensor. This application uses a Rogowski coil and amorphous alloy material to create a micro-current sensor, which draws power independently for safety warnings, providing start / stop alarms for downstream equipment. It can also transmit data wirelessly. The live-indication function of this application can intuitively identify the operating status of each circuit of the load equipment, solving the technical problem of no safety operation warning after energization in traditional mining cable entry devices. This is especially important in situations where multiple cables are laid in underground coal mine roadways, accurately determining their operating status; the safety warning is even more prominent in high-gas mines.

The present application relates to the technical field of automatic control, and further relates to a constant speed output control method for a magnetic base drill motor based on dynamic current feedback, wherein the magnetic base drill motor is an embedded permanent magnet synchronous motor driven by a three-phase inverter, and the method comprises the following steps: step 1: a tunnel magnetoresistance current sensor and a PCB embedded Rogowski coil are simultaneously arranged on each power bridge arm of the three-phase inverter; step 2: a reconstructed value of a quadrature axis voltage is reconstructed according to a direct current bus voltage and a space vector pulse width modulation duty ratio, a fractional order extended state observer is constructed, and a speed feedback signal and an equivalent disturbance voltage compensation signal are output; and step 3: a speed control loop generates a quadrature axis current reference value according to a difference between a speed given value and the speed feedback signal, so as to realize constant speed output control of the magnetic base drill motor. The present application reduces unnecessary heat generation and energy loss, and prolongs the continuous operation time of the equipment.

The present application relates to the technical field of relay protection, in particular to a zero sequence direction discrimination method, an electronic device and a storage medium. The method comprises the following steps: 1) obtaining a zero sequence voltage and a differential zero sequence current signal output by a Rogowski coil, and calculating the average values of the zero sequence voltage and the differential zero sequence current signal; 2) calculating the correlation coefficient of the zero sequence voltage and the differential zero sequence current signal according to the calculated average values of the zero sequence voltage and the differential zero sequence current signal; 3) determining the setting value of a zero sequence direction element, and comparing the size relationship between the correlation coefficient and the setting value of the zero sequence direction element, and judging whether the zero sequence direction element acts and the action direction according to the size relationship between the correlation coefficient and the setting value of the zero sequence direction element. The control of the zero sequence direction element is completed, the influence of the additional components introduced by the integrator of the Rogowski coil on the protection performance is avoided, and the protection performance is improved.

FIELD: electrical engineering.SUBSTANCE: invention can be used in digital measuring transformers to provide arc fault protection functions in cells of complete switchgear units of 6-35 kV electrical substations. An optical sensor is integrated into a digital measuring transformer comprising a Rogowski coil placed on a current conductor in the transformer housing, and an electronic-digital unit in which a multi-channel analogue-to-digital converter, a programmable microcontroller and a configurable relay with a discrete output are located. The sensor consists of a light guide connected to the front panel of the digital electronic unit and a photodetector located on the board of said unit. The photodetector is connected to a multi-channel analogue-to-digital converter via a current-to-voltage converter, forming an optical channel. The Rogowski coil is connected to a multi-channel analogue-to-digital converter via a circuit comprising an integrator and a low-pass filter, forming a current measurement channel used to implement overcurrent protection. The multichannel analogue-to-digital converter is connected to a programmable microcontroller via a digital interface. Based on the results of processing the analogue-to-digital conversion of the current signals of the optical channel and the current measurement channel, the microcontroller generates signals about the start and operation of the arc protection. The specified signals can be transmitted as telesignaling via the “МЭК” 61850-8-1 GOOSE protocol or used to transmit control signals to the built-in discrete output of the configurable relay.EFFECT: providing the ability to detect an electric arc inside the cells of complete switchgear without installing additional external sensors and separate arc protection devices, without significantly complicating its design, and also eliminating false alarms at low connection currents due to the use of a maximum current protection signal implemented in the transformer itself.5 cl, 1 dwg

This invention provides a self-calibration device for a Rogowski coil current sensor, comprising: a body for detecting current signals; a shielding shell covering the body, with multiple points of equal size evenly distributed on the outer surface of the shielding shell; a current source electrically connected to the points via cables, used to inject current into the shielding shell through the cables; and a test terminal for acquiring the gain of the Rogowski coil current sensor after the injected current and performing self-calibration of the Rogowski coil current sensor based on the gain. This invention injects the test signal from the current source into the shielding shell of the current sensor through multiple cables, putting the current sensor into an online testing state. This overcomes the influence of cable position on the sensor's measurement signal and eliminates the need to consider on-site wiring and rain / corrosion protection issues, avoiding the influence of the primary system on the calibration current, thereby improving the accuracy and reliability of the current sensor in actual field use.

This invention discloses a method for modeling the propagation characteristics of electromagnetic interference (EMI) in integrated primary and secondary distribution switches, belonging to the field of electromagnetic interference prediction and simulation technology. The method includes: obtaining a port response characteristic matrix through three-dimensional electromagnetic modeling and field-circuit co-simulation based on the electromagnetic coupling mechanism of a voltage sensor under high-frequency conducted interference; obtaining a disturbed output characteristic matrix of a current sensor through joint magnetic field-circuit modeling of a Rogowski coil based on the coupling path and frequency response characteristics in the port response characteristic matrix; and obtaining a system-level EMI propagation network matrix through field-circuit coupling modeling of the cable spatial magnetic field and multi-port crosstalk using the port response of the disturbed output characteristic matrix of the current sensor. Finally, a multi-physics integrated model of the entire integrated primary and secondary switch is obtained based on the coupling coefficient and propagation path in the system-level EMI propagation network matrix, resulting in a full-path simulation model of EMI propagation. This invention solves the problem that existing technologies cannot accurately model the EMI propagation characteristics of integrated primary and secondary distribution switches.

The current detection device (1) includes an analog circuit (40), an AD converter (50), and a calculation unit (60). The analog circuit (40) has a differential input circuit (41) connected to the two output terminals (11, 12) of the Rogowski coil (10). The AD converter (50) converts the analog signal output from the analog circuit (40) into a digital signal. The calculation unit (60) calculates the value of the current flowing through the conductor (2) based on the digital signal output from the AD converter (50). The Rogowski coil (10) has a neutral point (13) located at a position that will divide the voltage generated between the two output terminals (11, 12) into two equal parts. The analog ground (3) of the differential input circuit (41) is connected to the neutral point (13) of the Rogowski coil (10).

The provided is a method for detecting AC and DC arc faults based on Rogowski coil magnetic coupling resonance, where a line to be detected passes through a uniformly wound Rogowski coil, and by adjusting the dimensions of the framework structure, the number of winding turns, and the values of a parallel-connected inductor and capacitor, a specified resonant frequency is obtained; when an arc fault occurs in the line to be detected, the Rogowski coil amplifies the characteristic frequency band signal corresponding to the resonant frequency by means of magnetic coupling resonance, so as to detect an arc fault state.

The application discloses a composite current sensor based on a combination of a TMR array and an open-close Rogowski coil, and comprises an open-close magnetic gathering ring made of a high-magnetic-permeability nanocrystalline soft magnetic material, the inner wall of the magnetic gathering ring is symmetrically provided with a multi-channel TMR sensor array to form a differential detection structure, and a semicircular ring-shaped PCB Rogowski coil is arranged outside the magnetic gathering ring and is used for sensing a current change rate; the TMR array detects a local magnetic field distortion caused by an opening air gap in real time, a three-layer error model is established, an extended Kalman filter or a least square algorithm is combined to online estimate complex correction coefficients, the amplitude and phase of the output of the Rogowski coil are compensated, the closed-loop correction of the air gap error is realized, the problem of the decrease of the measurement accuracy of the traditional open-close current sensor caused by the air gap is solved, the DC / low-frequency response advantage of the TMR sensor and the wide frequency band characteristic of the Rogowski coil are fused, the precision can reach 0.2 level in the 0-100 A measurement range, the application is suitable for electric energy metering and power protection systems, and the application has the advantages of high precision, easy installation and strong anti-interference capability.