1047results about "Instrument screening arrangements" patented technology

The invention provides a power management chip pin state intelligent detection method and system. The method comprises the steps that temperature difference quantity is input into a gradient heat conduction compensation structure, and compensation current opposite to a temperature gradient vector is generated based on temperature field distribution in the copper-based composite material; superposing and coupling the voltage fluctuation signal and the compensation current to generate a reference voltage signal; performing frequency component separation processing on the reference voltage signal, and extracting electromagnetic interference characteristic data in a frequency component; performing time sequence correlation on the electromagnetic interference characteristic data and the temperature distribution data, dynamically adjusting an interference suppression parameter through closed-loop control, and acting the adjusted interference suppression parameter on an interference suppression process of a reference voltage signal to generate a pin state detection signal; and detecting the pin state of the power management chip according to the pin state detection signal. According to the invention, the pin voltage stability and the state detection precision of the power management chip are improved.

The invention discloses a non-contact magnetoelectric composite current sensor with magnetism gathering and magnetic shielding. A sensor core is composed of a magnetoelectric sensing element, a magnetofluid layer, a magnetism gathering structure and a magnetic shielding layer. The magnetoelectric sensing element is made of manganese-doped lead magnesium niobate and amorphous alloy film composite materials, the outer side of the sensing element is coated with a magnetofluid layer made of soft magnetic composite materials, the magnetism gathering structure is made of permalloy materials with high magnetic conductivity and is divided into an upper part and a lower part, the upper part accommodates the sensing element and the magnetofluid layer, and the lower part accommodates the magnetic gathering structure. And the lower part is provided with a standardized groove for placing a conductor to be tested. The outermost layer is a magnetic shielding layer composed of multiple layers of nanocrystalline alloy strips, the vertical split type design is also adopted, and it is ensured that the magnetic shielding layer is tightly matched with the magnetic gathering structure through precision machining. The upper magnetic shielding layer and the lower magnetic shielding layer are detachably connected, and field installation is facilitated. The overall structure is compact, a circuit does not need to be disconnected during installation, and the device is especially suitable for on-line current monitoring requirements in the fields of smart grids, industrial automation and the like.

The invention discloses an anti-electromagnetic interference high-precision current sensing circuit and a current sensor, and relates to the technical field of current measurement. The system comprises a signal conditioning circuit used for carrying out voltage division on power supply voltage to obtain direct current bias voltage, superposing the direct current bias voltage with a sensor signal collected by a TMR sensor, carrying out amplification processing on the superposed sensor signal, and transmitting the amplified sensor signal to a signal filtering circuit; the signal filter circuit is used for filtering interference signals and clutters of the amplified sensor signals, and the filtered sensor signals are sent to the MCU for signal processing. The anti-electromagnetic interference high-precision current sensing circuit has the beneficial effects that firstly, the anti-electromagnetic interference high-precision current sensing circuit analyzes related interference sources and propagation paths of electromagnetic interference in a power grid operation environment, optimizes and selects types of electronic components and device layout, and effectively reduces the interference of the electromagnetic interference on the current sensing circuit; secondly, a hierarchical protection system structure is followed, and the influence of electromagnetic interference on a measurement circuit is reduced;

The invention discloses a capacitive voltage transformer for a gas insulated substation, which comprises a capacitive voltage divider and an electromagnetic unit, the capacitive voltage divider comprises a high-voltage capacitor C1 and a medium-voltage capacitor, the medium-voltage capacitor comprises a medium-voltage capacitor C21 and an externally connected medium-voltage capacitor C22, and the capacitance of the medium-voltage capacitor C22 is greater than that of the medium-voltage capacitor C21; the electromagnetic unit is connected with the capacitive voltage divider, an intermediate transformer and a compensation reactor are arranged in the electromagnetic unit, a full-shielding high-voltage shielding cover is arranged outside a high-voltage coil of the intermediate transformer, a damper and an overvoltage protector are arranged outside the electromagnetic unit, and the damper and the overvoltage protector are placed in an external junction box. The problem that in the prior art, an extra-high voltage transformer is low in lightning impulse overvoltage tolerance capacity is solved, the impulse overvoltage tolerance capacity is improved, and the breakdown risk is reduced.

The invention belongs to the technical field of electrical measurement, and particularly discloses a hundred-kA impact large-current sensing device based on a multi-composite magnetic core material. The device comprises a multi-composite magnetic core framework, a current winding coil, a parallel resistor and a shielding shell, the multi-composite magnetic core framework is formed by compounding at least two magnetic materials, the multi-turn current winding coil is distributed on the multi-composite magnetic core framework, and the two ends of the parallel resistor are connected with the two ends of the current winding coil respectively; the shielding shell is located on the outer side of the composite magnetic core framework. A current conductor to be measured penetrates through the composite magnetic core framework in the axial direction, and the measurement output end of the current winding coil is connected with an output circuit. The technical problem that an existing impact large-current sensing device cannot meet the technical requirements of high-amplitude and high-accuracy impact large-current measurement is solved.

The invention discloses an MEMS and TMR fused overhead line lightweight monitoring device, and the device comprises an annular shielding cover which sleeves a to-be-detected overhead conductor and is coaxial with the to-be-detected overhead conductor, and the side wall of the annular shielding cover is provided with a through hole; the sensing unit comprises at least two MEMS electric field sensors and at least two TMR magnetic field sensors and is used for detecting an electric field and a magnetic field generated by the overhead conductor to be detected; the analysis processing unit is used for receiving, processing and transmitting the signal generated by the sensing unit; and the power supply unit is arranged in the annular shielding cover and is electrically connected with the sensing unit and the analysis processing unit. The beneficial effect of the invention is that the coupling crosstalk phenomenon generated by an external electromagnetic field can be effectively suppressed. Moreover, the monitoring device is small in size, is convenient to install and deploy in a complex line environment, provides a stable hardware basis for precise inversion of voltage and current through structural cooperation, and provides reliable support for intelligent monitoring of an overhead line.

The invention discloses a phase-adjustable large-current generator, and the generator comprises a main circuit module, and a topological structure of the main circuit module employs a multi-stage IGBT inverter; the phase control module inputs a power grid voltage signal through a voltage transformer, adopts an SOGI-PLL structure to improve signal tracking precision, and combines a virtual synchronous machine technology to enhance system balance and a self-adaptive control strategy to dynamically adjust an output signal so as to realize phase control and synchronization; the electromagnetic compatibility optimization module adopts a layered shielding design and is combined with an optical fiber to transmit a control signal, so that the electromagnetic compatibility of equipment is improved; a relay protection test integration module, wherein the relay protection test integration module comprises a differential protection test mode and a distance protection test mode; according to the invention, the problems of low phase adjustment precision, poor synchronization stability and insufficient electromagnetic compatibility of a large current generator in a new energy grid-connected environment are solved.

The invention relates to a vertical magnetic field interference resistant inductor, an electric power meter and a manufacturing method thereof, the vertical magnetic field interference resistant inductor comprises a Rogowski coil and an annular vertical magnetic field counteracting coil located in the Rogowski coil, the Rogowski coil comprises an even number of self-adhesion hollow coils which are connected in series end to end, the wire diameter, the number of turns, the number of layers, the inner diameter and the outer diameter of each hollow coil are consistent, and the vertical magnetic field counteracting coil is located in the Rogowski coil. The Rogowski coils are arranged in the same horizontal plane and are symmetrically distributed on the same horizontal plane with a circle as the center, hole parts of the hollow coils jointly form an annular channel, the inning area of the vertical magnetic field offset coil is equal to the inning area defined by the Rogowski coils, and a pre-positioning support is arranged in the annular channel in a penetrating and matched mode. The vertical magnetic field counteracting coil is located at the center of the annular channel, and the Rogowski coil and the vertical magnetic field counteracting coil are provided with output ends. Therefore, the technical problem that small current detection is easily interfered by an external power frequency electromagnetic field is solved.

The invention discloses gap detection equipment and a capacitance detection device thereof, which are applied to the technical field of signal detection, and comprise a bipolar capacitive sensor which is provided with a first detection electrode and a second detection electrode and is used for outputting a first capacitance signal and a second capacitance signal which reflect the capacitance of a detected position; the excitation generation circuit is used for applying excitation to the first capacitance signal and the second capacitance signal based on the first excitation carrier and the second excitation carrier which are symmetrical and opposite in phase to obtain a modulated first detection signal and a modulated second detection signal; the capacitance-voltage conversion circuit is used for receiving the first detection signal and the second detection signal and carrying out conversion from a capacitance signal to a voltage signal and signal amplification in a differential amplification mode to obtain a first conversion signal and a second conversion signal; and the detection processing circuit performs phase-sensitive demodulation to obtain a phase-sensitive demodulation result and extracts a detection result of the capacitance corresponding to the detected position from the phase-sensitive demodulation result. According to the scheme of the invention, the common-mode interference suppression capability is high, and the precision of capacitance detection is effectively improved.

The utility model relates to a control device for a microwave anechoic chamber test system. Comprising a shielding box which is a sealed cavity provided with a cover plate, and the shielding box is provided with a power supply socket, a data socket and an optical fiber coupler; a control circuit board, an AC-DC power supply module, a data optical fiber transceiver and other modules are installed in the shielding box. A plurality of motor control units, a power supply interface and a communication interface are integrated on the control circuit board, and a first output end of the AC-DC power supply module is connected with the control board and is used for supplying power to the control board; one end of the data optical fiber transceiver is electrically connected with the optical fiber coupler, and the other end is electrically connected with the communication interface for converting the signal into an optical signal and outputting the optical signal. The control circuit board is placed in the shielding box, so that the size of the rotary table or antenna tower equipment is reduced, and the electromagnetic interference risk of a motor and a darkroom environment is reduced; the control circuit board integrates the servo motor control unit and the stepping motor control unit for modular design, serves as an independent unit of the darkroom test system, and is high in universality.

The invention, which relates to the technical field of reactor production, discloses an electric reactor automatic preassembling test platform comprising an automatic placement negative pressure suction structure which can drive an electrolyte electromagnetic elimination protection plate to perform angle rotation under the cooperation of a dynamic anti-interference assembly, so that an eddy current effect is generated in the rotation process of an electrolyte in the electrolyte electromagnetic elimination protection plate; external electromagnetic interference signals are absorbed and reflected, the influence on the reactor test process is reduced, and the adaptive filter is synchronously enabled to realize transverse displacement adjustment through the first transverse adjustment rail slidably connected to the bottom so as to adapt to the test requirements of reactors at different positions, so that the adaptive filter is enabled to cooperate with the dynamic anti-interference assembly, and the test efficiency is improved. The high-frequency signal is subjected to pure extraction and analysis, interference is reduced, the test stability is further improved, the accuracy and reliability of a test result are ensured, the influence of external factors on the test result is reduced, and the accuracy and reliability of the test result are further improved under the cooperation of the test assembly.

A current sensor includes busbars through which a current to be measured flows, magnetic detectors capable of detecting a magnetic field generated when the current to be measured flows through the busbars, a storage space storing the magnetic detectors, and a housing with which part of the busbars is integrated. Ends of the busbars are connected to an external first unit including a cooling device, and other ends of the busbars are connected to an external second unit whose temperature becomes higher than that of the first unit when the current to be measured flows. In the current sensor, which is capable of measuring a current value of the current to be measured from a result of the detection performed by the magnetic detectors, the housing has first vents penetrating from the inside of the storage space to the outside on a side facing the first unit.

The invention belongs to the technical field of gap measurement, and particularly relates to a high-temperature-resistant transparent shell type eddy current tip gap measuring device and method, and the device comprises a sensor probe module, a signal conditioning module, a data collection module and a data processing module. The sensor probe module is mounted on the outer wall of the casing; the sensor probe module comprises a permanent magnet excitation source, a soft magnet magnetic core and a receiving coil; the signal conditioning module is electrically connected with the receiving coil and is used for amplifying, filtering and integrating the weak induction signal; the data acquisition module is electrically connected with the signal conditioning module and converts an analog signal into a digital signal; the data processing module is used for processing the acquired digital signals and extracting blade tip clearance information.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

The invention discloses a shielding coupling device and method for an electronic interference pod in-situ test, and relates to the technical field of airborne electronic countermeasure equipment testing, the shielding coupling device is a split type shielding coupling device, and a segmented shielding coupling mode is adopted for the frequency band and the installation position of a pod antenna. The device is composed of two high-frequency-band antenna shielding coupling boxes and two low-frequency-band antenna shielding coupling boxes which are respectively used for shielding and coupling front and back high-frequency-band directional antennas of an electronic interference pod and low-frequency-band omnidirectional antennas of the abdomen. According to the shielding coupling device and method for the in-situ test of the electronic interference pod, the shielding coupling box can completely and tightly wrap all transmitting and receiving antennas of the electronic interference pod, isolate external interference electromagnetic signals, reduce leakage of internal electromagnetic signals, reduce the false alarm rate and improve the test precision; in-situ testing can be carried out on the electronic interference pod without constructing a microwave anechoic chamber, so that the testing cost is greatly reduced.

According to the self-shielding type anti-interference current transformer and the dynamic magnetic field compensation method thereof, external interference magnetic field data are detected in real time through the magnetic field sensing layer, a basis is provided for interference shielding of a magnetic field, reverse magnetic field data are set based on the external interference magnetic field data, a main shielding winding generates a reverse magnetic field, the reverse magnetic field and an interference magnetic field are superposed and offset, and the self-shielding type anti-interference current transformer is obtained. Auxiliary magnetic field data are set for further magnetic field shielding through the residual suppression layer based on the offset condition of reverse magnetic field data on external interference magnetic field data, the auxiliary shielding winding further eliminates high-frequency residual interference, finally 0-20 kHz broadband interference suppression is achieved, performance stability can be kept within the temperature range of-40 DEG C to 120 DEG C, three dynamic shielding layers are adopted, and the performance stability is improved. The problem of dynamic interference in a complex electromagnetic environment is solved, and the measurement precision is improved to 0.1%.

The invention provides a flexible opening and closing type fixed magnetic shielding current measuring device and a measuring method. The measuring device comprises an opening and closing type shielding shell which is of an annular structure; the conductor clamping mechanism is arranged at a central hole position of the opening and closing type shielding shell; the flexible Rogowski coil is detachably arranged in an inner cavity of the opening and closing type shielding shell, and a coil clamping assembly is arranged in the inner cavity of the opening and closing type shielding shell. The influence of an external interference magnetic field on the measurement precision of the flexible Rogowski coil can be greatly weakened, the measured current can be ensured to vertically pass through the skeleton plane center of the Rogowski coil, the influence of the position deviation of the measured current on the measurement precision of the flexible Rogowski coil is effectively reduced, the installation and the disassembly are convenient, the use flexibility can be greatly improved, and the measurement precision of the flexible Rogowski coil is improved. The influence of the position deviation of the measured current and an external interference magnetic field on the measurement precision of the flexible Rogowski coil is reduced, and the stability and the flexibility of measurement are improved.

The utility model relates to the field of electromagnetic field detection, in particular to an electromagnetic field detection device of an internet of things sensor, which comprises a shell, a circuit board, a shielding cover, a detection probe, a signal processing module and a signal transmission module. The detection probe can collect electromagnetic field signals in the environment where the detection probe is located and send the collected signals to the signal processing module, and the signal processing module sends the processed signals to the signal transmission module and sends the processed signals to the cloud server. According to the utility model, the internal circuit board is isolated from the external electromagnetic field environment through the shielding cover, so that the influence of the electromagnetic field in the external environment on the internal circuit is reduced.

A current sensor assembly includes a housing; a plurality of shields which are accommodated inside the housing and open toward the top of the housing; a plurality of bus bars to which three-phase current is applied and which are arranged spaced apart from each other so as to go past the plurality of shields, respectively; and a current sensor unit which includes a printed circuit board and a plurality of current sensors disposed on the printed circuit board to measure the current applied to the bus bars. The shields, the bus bars, and the current sensor unit are configured to be accommodated inside the housing, and the current sensors are spaced apart from the bus bars and disposed in the inner spaces of the shields.

The invention relates to the technical field of charge and discharge detection, and discloses a multichannel EIS charge and discharge in-situ test system and method, and the system comprises a DC charge and discharge module which is used for carrying out the constant-current, constant-voltage or cyclic charge and discharge test of a battery; the alternating current impedance test module is connected in parallel with the direct current charging and discharging module and is used for applying an alternating current disturbance signal to the battery and collecting impedance response in the charging and discharging process; and the unified clock module is used for providing a synchronous triggering reference signal for the direct current charging and discharging module and the alternating current impedance test module. The direct current charging and discharging module and the alternating current impedance test module are designed to be of a parallel connection normally-connected structure, no relay switching is needed, continuous and uninterrupted online EIS test in the charging and discharging process is achieved, contact resistance drift and transient errors caused by physical circuit switching in a traditional scheme are effectively avoided, and the reliability of the EIS test is improved. And the stability and repeatability of the test are obviously improved.

Provided is a test module for testing the performance of an image sensor, the test module including a test board having an area greater than an area of the image sensor and configured to be coupled to the image sensor, and a connector electrically connected to the image sensor and configured to transmit an electrical signal received from the image sensor to a test socket, wherein the test board includes a dummy region of which an outer perimeter corresponds to a perimeter of the test board and configured to be electrically cut off from the image sensor, and a cut-off region formed corresponding to an inner perimeter of the dummy region, located between the dummy region and the image sensor, and configured to electrically cut off the dummy region from the image sensor.

The invention discloses a partial discharge detection method and device based on discharge spectrum chromaticity, and belongs to the technical field of power systems, and the method comprises the steps: collecting a plurality of discharge optical signals of switch cabinet equipment; for each discharge optical signal, carrying out chromaticity analysis on the RGB monochromatic light signal, and respectively calculating color chaos degree, spectrum color gamut deviation degree, spectrum chromaticity dynamic coupling parameters and hue purity ratio; calculating a chromaticity difference weight based on the full-band optical signal and the RGB monochromatic light signal; performing weighted integration on the color chaos degree, the spectrum color gamut deviation degree, the spectrum chromaticity dynamic coupling parameter and the hue purity ratio based on the chromaticity difference weight to obtain a chromaticity comprehensive magnitude; calculating the mean value of the comprehensive chromaticity values of the plurality of discharge optical signals; and comparing the chromaticity comprehensive magnitude mean value with the plurality of judgment chromaticity ranges, and determining a discharge type detection result of the switch cabinet equipment. According to the invention, the problem of low accuracy of partial discharge detection in the prior art can be solved.

The invention discloses a slope landslide and bridge collapse disaster monitoring and early warning device, and belongs to the technical field of geological monitoring. The method comprises the following steps: under the condition of carrying out monitoring and early warning on a slope landslide disaster, a sensing line is arranged on a slope through longitude lines or latitude lines; under the condition that monitoring and early warning are carried out on bridge collapse disasters, the sensing lines are arranged around each beam piece and intersect with the beam pieces. Under the condition that the slope does not slide or the bridge does not collapse, the voltage between the first wiring terminal and the second wiring terminal is in a first state; under the condition that the slope slides or the bridge collapses, the sensing circuit breaks, and the voltage detection circuit determines that the voltage between the first wiring terminal and the second wiring terminal is in a second state; and determining the voltage between the first terminal and the second terminal as a third state through the voltage detection circuit under the condition of sensing that the circuit is short-circuited. According to the method, early warning can be carried out on the condition that the broken line may be short-circuited at the water accumulation position, and the reliability is high.

The invention discloses a radiation-inhibiting needle point structure, a two-dimensional probe and a microwave test system, belongs to a microwave radio frequency test technology, and aims to solve the problems that radiation crosstalk is aggravated and insertion loss is abnormal in a millimeter wave to terahertz frequency band on-chip test, and a traditional three-dimensional probe is limited by process precision and is difficult to meet high-frequency test requirements. The radiation-inhibiting needle point structure comprises a ground wire and a signal wire, the ground wire is located on two sides of the signal wire to form a GSG needle point structure, and a supporting structure is arranged between the ground wire and the signal wire; a cantilever type shielding layer is arranged above the ground wire, and a G needle root hollowed-out structure is arranged at the position, close to the root of the needle tip, of the cantilever type shielding layer; each of the ground wire and the signal wire comprises a GSG needle point structure lower nickel layer and a GSG needle point structure upper copper layer, the needle point part of the ground wire is provided with a transition structure, and the thickness of the transition structure is gradually reduced from the root of the needle point to the tip of the needle point; a signal line is constrained in a quasi-TEM mode for transmission, so that high-frequency radiation leakage is effectively inhibited; and the stress of the needle tip can be optimized by adjusting structural parameters.

The invention discloses a radio frequency chip test electromagnetic shielding box, and belongs to the field of electromagnetic shielding boxes. Comprising a shielding box body, a bearing plate body is arranged in the shielding box body, the right side of the shielding box body is rotationally connected with a hollow screw tube through a rotating shaft, the right end of the hollow screw tube extends into the shielding box body, the outer side wall of the hollow screw tube is in threaded connection with a threaded sleeve, and a fixing block is fixedly connected to the front of the right side in the shielding box body. The outer side wall of the fixing block is rotationally connected with a concave piece through a rotating shaft, and the rear surface of the concave piece is fixedly connected with an inclined abutting piece. The bearing plate body is used for placing a radio frequency chip and can slide in the shielding box body to form a radio frequency chip protection shell together, the cover plate is inserted into the inner side of the clamping seat through the insertion box on the cover plate and can be clamped into the clamping opening through the clamping block, so that the cover plate can cover the shielding box body, the closed shielding effect of the radio frequency chip is achieved, and the service life of the radio frequency chip is prolonged. And the subsequent test is facilitated.

The invention relates to the technical field of electromagnetic measurement, and discloses a measurement unit stabilization method and system, electronic equipment and a storage medium, and the method comprises the steps: obtaining three-dimensional displacement trajectory data in real time, and building a motion error compensation model containing a mechanical vibration direction vector and a phase offset; on the basis of asymmetric magnetic pole distribution, combined with phase difference calculation of a magnetic circuit gradient direction vector and a mechanical vibration direction vector, a closed loop current orthogonal to the mechanical vibration direction vector is generated on an interface to realize gradient isolation; based on a multi-branch common-mode suppression mechanism, an interference signal reaches a preset attenuation amplitude before a loop is closed through combination of a magnetic core impedance matching characteristic and an eddy current effect; and performing dynamic matching based on the displacement parameter and an electromagnetic interference attenuation result, adjusting a magnetic pole inclination angle in real time, and forming a closed-loop control path of magnetic field gradient compensation and mechanical vibration suppression. According to the invention, the stability and anti-interference capability of the measuring unit under severe working conditions can be improved.

The invention discloses a vehicle body domain control compatible load box which comprises a box body, the top surface of the box body is provided with an upper cover panel, the bottom surface of the box body is provided with a grounding panel, and the side surface of the box body is provided with a plugging adapter panel, a load indication panel, a communication interface panel and a shielding panel. The plug-in switching panel and the load indication panel are connected through a switching line, and the plug-in switching panel is provided with an IDH high-level analog input module, an IDL low-level analog input module, a sensor analog module, an LIN bus communication analog module and a CAN bus communication analog module. Wherein the LIN bus communication simulation module and the CAN bus communication simulation module are connected with the communication interface panel through patch cords, and the load indication panel is provided with an HSD high-side driving simulation module, an LSD low-side driving simulation module and an H-bridge driving simulation module. Complex EMI interference is greatly reduced, the redundant degree of the load is greatly reduced, the load box can be compatible with different items, and the universality of the load box is improved.

The invention discloses a capacitance parameter determination method and device of an iron core sensing device for transformer partial discharge detection, electronic equipment and a storage medium, and belongs to the technical field of sensor design, and the method comprises the steps: obtaining an iron core three-dimensional model of a transformer; performing electromagnetic simulation on the iron core three-dimensional model to generate antenna characteristic parameters of the transformer iron core under each frequency in a preset frequency band; determining a target detection frequency band of the transformer core according to the antenna characteristic parameters; repeatedly executing the parameter adjustment operation of the iron core sensing device until the current test frequency band covers the target detection frequency band, and determining the capacitance parameter of the iron core sensing device; therefore, by implementing the invention, the problem that the capacitance parameters of the iron core sensing device in the prior art are not accurately determined can be solved.

The invention provides a current detection probe, which comprises a current clamp and a detection cable, and is characterized in that the detection cable is electrically connected to the current clamp; the detection cable comprises a protective layer, an insulating layer, a probe magnetic core and an inner conductor, the inner conductor is embedded in the probe magnetic core, the insulating layer wraps the probe magnetic core, and the protective layer wraps the insulating layer and the current clamp. The current clamp solves the technical problems that a traditional current clamp causes electromagnetic leakage due to wire exposure and cannot accurately complete detection work due to external interference.

The invention discloses an arc extinguishing and harmonic elimination device, which relates to the technical field of circuit overvoltage protection equipment. A detection module, a control module, and a fault processing module are respectively arranged in independent chambers in a device shell for installation, and each module is surrounded by a shielding net. The shielding net is used to reduce electromagnetic interference outside the module. During the operation of the device, the influence of the magnetic field generated by the arc extinguishing coil on the fault processing module on the voltage transformer on the detection module is reduced, the anti-electromagnetic interference performance of each module is improved, and the accuracy of the detection voltage of the detection module is guaranteed.