300 results about "Rogowski coil" patented technology

The invention discloses a Rogowski coil current transformer and a current measurement system, and relates to the technical field of current measurement. The Rogowski coil current transformer comprises a Rogowski coil and a signal processing circuit; the differential signal is converted into a differential constant-current signal to be output based on a signal processing circuit; the signal processing circuit comprises an integral amplification module for performing integral amplification on the differential signal based on the integral amplification module; the first direct current component removing module is used for removing a direct current component in the voltage signal after integral amplification based on the first direct current component removing module; the signal adjusting module is used for realizing amplitude in-phase amplification and phase compensation; the single-ended to differential output module is used for generating symmetrical differential voltage signals based on the single-ended to differential output module; and the conversion module is used for converting the symmetrical differential voltage signal into a differential constant current signal and outputting the differential constant current signal based on the conversion module. And through the integral amplification module and the phase compensation module, the differential signal is accurately converted into the current signal, so that the current measurement result is more accurate.

The invention provides an electric energy quality on-line monitoring device and a cloud platform cooperation system, and relates to the technical field of electric energy quality management, and the device comprises a signal collection unit which obtains three-phase voltage and current signals in parallel through a Rogowski coil and a capacitive voltage divider; the event detection unit is used for synchronously executing harmonic spectrum analysis and transient event capture by adopting a parallel processing architecture realized by an FPGA (Field Programmable Gate Array); the edge processing unit is connected with the event detection unit, and is configured to encode the transient event features into a Gramer angle field image and compress steady state data into feature vectors; the multimode communication unit comprises a 4G / 5G wireless module and an optical fiber Ethernet interface; and the strategy execution interface outputs a treatment instruction to the compensation device through the D / A converter and the current loop. Through collaborative innovation of the device and the cloud platform, the power quality monitoring and treatment efficiency is remarkably improved.

The invention relates to an on-line monitoring device and system based on an alternating current arrester. The on-line monitoring device comprises a basic monitoring unit, an environment sensing unit, a relay unit, a control unit and a calibration unit. The basic monitoring unit comprises a Rogowski coil 1 for monitoring the leakage current of the lightning arrester and a Rogowski coil 2 for monitoring the impact current. And the relay unit is controlled by the control unit and controls the working states of the Rogowski coil I and the Rogowski coil II. The environment sensing unit is used for monitoring environment parameters around the lightning arrester, the control unit judges environment parameter error coefficients according to the environment parameters and then feeds back the environment parameter error coefficients to the calibration unit, and the calibration unit forcibly corrects monitoring results. The measuring range can be automatically switched, high-precision monitoring is achieved through the first Rogowski coil in the case of low current, the second Rogowski coil is automatically switched to conduct wide-range monitoring in the case of impact current, the two Rogowski coils do not affect each other, and the measuring device has the advantages of being low in energy consumption and high in precision. And the calibration unit forcibly corrects the monitoring result, so that the detection precision of the device at low temperature is improved.

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 relates to the technical field of distribution line state detection, in particular to a detection system for intelligently analyzing the state of a distribution line, which comprises a thermal imaging detection module, a current monitoring module, an identification module, a video monitoring module, a photographing recording module, a watermark adding module, a data analysis report module and a remote communication control module. The thermal imaging detection module is used for infrared acquisition and image processing; the current monitoring module is used for Rogowski coil detection and data analysis and transmission; the identification module is used for fault feature extraction and fault diagnosis. The detection system for intelligently analyzing the state of the distribution line has the advantages of real-time monitoring, automatic processing, intelligent diagnosis, remote monitoring and control, video monitoring and photographing recording, watermark adding, report generation and the like, the efficiency and accuracy of state detection of the distribution line can be remarkably improved, the operation and maintenance cost is reduced, and the system is suitable for popularization and application. And safe and stable operation of a power system is ensured.

The invention relates to an IGBT parallel current sharing control circuit and method for turn-off transient current change rate detection, and the circuit employs a PCB Rogowski coil probe to carry out the non-contact detection of the turn-off current change rate of a parallel device, thereby accurately judging the non-current sharing characteristic of the parallel device. The problem of integrated design of a traditional detection scheme in large-current and high-power-density application is effectively solved; meanwhile, by designing a current change rate peak holding circuit, the holding time of a peak signal is remarkably prolonged, and the performance requirement on the ADC sampling rate is greatly reduced; a reset branch is additionally arranged for the peak holding circuit, and the peak output value in the last period is zeroed in the turn-on transient state by using a driving signal, so that the charge accumulation effect is effectively eliminated, and the sampling precision of the system is guaranteed; the regulation and control part of each parallel branch only needs to be additionally provided with two passive elements including the control switch and the capacitor, current sharing control can be achieved by adjusting the access time of the bypass branch, the structure is simple, cost is low, and good popularization applicability is achieved.

The invention belongs to the technical field of smart buildings, and relates to a green energy-saving building energy consumption real-time monitoring and intelligent optimization system and method based on the Internet of Things, and the system comprises a sensing layer which comprises an environment sensor group which collects the temperature, humidity, illumination intensity and CO2 concentration; the non-intrusive electric energy monitoring module measures equipment current through a Rogowski coil, and the precision is + / -0.5%; the equipment state acquisition terminal is used for acquiring the frequency of an HVAC compressor and the state of a lighting switch; the network layer comprises a multi-protocol edge gateway which supports the conversion from ZigBee / LoRa / Modbus to an MQTT protocol; the block chain evidence storage module is used for generating an SHA-256 hash value for the energy consumption data and uploading the SHA-256 hash value to the chain; the platform layer comprises a digital twin engine which is used for generating an energy consumption three-dimensional thermodynamic diagram based on a BIM model; the optimization control core is composed of an LSTM load prediction unit and an NSGA-II multi-objective optimization unit. The energy efficiency leap of 12-18% comprehensive energy saving (far exceeding the average level of 5-8% in the industry) is realized through a technical chain of'accurate perception-intelligent decision-making-closed-loop control '.

The invention discloses a high-voltage electric pulse cracking coal rock stress shock wave monitoring device which comprises a high-voltage pulse capacitor, a voltage divider, a high-voltage pulse switch, a high-voltage pulse cracking generation chamber, a high-voltage probe, a Rogowski coil and an oscilloscope. A test piece is fixed in the high-pressure pulse cracking generation chamber, a circle of test piece clamping assembly corresponding to the test piece is arranged in the high-pressure pulse cracking generation chamber, needle-shaped electrodes are arranged on the two sides, not provided with the test piece clamping assembly, of the test piece, and a piezoelectric pressure sensor is arranged on the high-pressure pulse cracking generation chamber. The detection signal output ends of all the piezoelectric pressure sensors are connected with the pressure detection signal input end of the stress wave signal collector, and a Faraday cage used for covering the piezoelectric pressure sensors is arranged in the high-pressure pulse fracturing generation chamber. The propagation characteristics of the high-voltage electric pulse stress shock waves in the coal rock mass can be accurately and directly captured in real time, and accurate and reliable data support is provided for deep research on a high-voltage pulse electric crushing mechanism.

The invention relates to the technical field of motor insulation state monitoring, and discloses a motor winding turn-to-turn discharge monitoring method and device based on Rogowski coils. The high-pass integrator is matched to carry out integral operation on coil output signals in a centralized mode to obtain high-frequency discharge current data, then fault characteristic quantity is constructed based on the data, the fault position of the motor cable is determined, an independent monitoring module does not need to be configured for each phase of cable, and the single high-pass integrator can complete centralized processing of multi-coil signals. Not only is the use amount of core monitoring parts greatly reduced to reduce the monitoring cost, but also the hardware layout is remarkably simplified to save the installation space, and meanwhile, the data processing nodes are reduced to reduce processor resource occupation, and the problems of high monitoring cost, large space and resource consumption and low monitoring efficiency in the prior art are effectively solved.

The invention discloses a distributed traveling wave distance measurement method, equipment and a storage medium. The system is composed of monitoring terminal equipment arranged along a power transmission line, an APN data transmission network and a central station system. The monitoring terminal acquires a traveling wave signal through a Rogowski coil and calibrates time through a GPS synchronous clock, and data is encrypted and then transmitted to the central station; the central station adopts a distributed cluster architecture, analyzes multi-manufacturer data through a unified equipment protocol, calculates a fault position by using a double-end positioning method in combination with a wave velocity self-learning technology, and identifies a fault type based on wave tail time characteristics. The method comprises the steps of monitoring point arrangement, data encryption transmission, waveform feature extraction, fault positioning, graded early warning and the like. According to the system and the method, the problems of poor compatibility, low positioning precision and low operation and maintenance efficiency of equipment of multiple manufacturers are solved, and high-precision positioning and intelligent diagnosis of power transmission line faults are realized.

An integrator direct current error elimination and low frequency noise reduction circuit based on Rogowski coils solves the technical problem of how to eliminate direct current errors in an integrator circuit composed of Rogowski coils, and adopts the technical scheme that the circuit comprises an integrating circuit composed of a first amplifier and an integrating capacitor, the in-phase end of the first amplifier is used as the current input end a of the Rogowski coil, and the key point is that a T-type network filter circuit is connected between the feedback output end b of the integrating circuit and the inverted input end of the first amplifier. The utility model has the advantages that due to the existence of the T-type network filter circuit, oscillation is avoided, feedback is taken from the tail end of the integral circuit, the direct current offset of the whole forward channel can be eliminated, the three-order high-pass filter function is realized, the maximum low-frequency noise is low, and the signal-to-noise ratio is improved.

The invention discloses a flexible DC converter valve DC support capacitor current on-line monitoring method and system, and the method comprises the steps: controlling a Rogowski coil to collect the operation data of a selected capacitor in a flexible DC converter valve in response to an external sampling starting instruction; sequentially performing amplification, filtering and abnormal value detection processing on the current waveform data to obtain to-be-corrected current data; based on a pre-constructed neural network model, performing correction processing on the to-be-corrected current data to obtain to-be-analyzed current data; analyzing the to-be-analyzed current data based on a big data analysis technology and a machine learning algorithm; and according to an analysis result, a generated current regulation and control instruction matched with the analysis result is sent to the selected capacitor. According to the method provided by the invention, the monitoring precision of the capacitor is improved.

The invention relates to a vertical magnetic field interference resistant inductor which comprises a Rogowski coil and a vertical magnetic field counteracting coil located on one side of the Rogowski coil and connected with the Rogowski coil, the Rogowski coil comprises a plurality of hollow coils connected end to end, and the wire diameter, the number of turns, the number of layers, the inner diameter and the outer diameter of each hollow coil are consistent. The number of the hollow coils is not less than 4 and is an even number, the hollow coils are used for being symmetrically distributed on the same horizontal plane with a circle as the center, and output ends are arranged on the Rogowski coil and the vertical magnetic field counteracting coil. Therefore, the technical problem that the current common Rogowski coil is easy to be interfered by an external power frequency electromagnetic field when being used for small current detection, so that the actual current cannot be normally reflected by a large measurement error is solved, and the application limitation of the current Rogowski coil is broken through.

The utility model discloses a signal processing circuit for a Rogowski coil, and belongs to the field of intelligent power grids. The signal processing circuit used for the Rogowski coil has the characteristics of real-time measurement, fast response speed and wide current measurement range, and especially can ensure the metering precision under a small current working condition. The Rogowski coil converts a primary side current value into a current-to-time differential signal, the passive RC integrating circuit reduces the turning frequency of the differential signal, the low-pass filtering circuit effectively attenuates a high-frequency signal, the T-type integrating circuit integrates the differential signal to restore an original signal, and the blocking circuit filters and blocks the integrated signal. The adjustable proportion amplification circuit performs in-phase amplification on the integral signal and adjusts the amplitude of the output signal as required, and the anti-aliasing filter circuit filters the amplified integral signal and finally inputs the integral signal to the sampling chip for current metering.

The invention belongs to the technical field of porcelain insulator zero-value detection, and discloses a porcelain insulator zero-value detection device and a detection method thereof, and the device is used for portable rapid zero-value detection or zero-value detection for early defective insulators / partially degraded insulators. The portable rapid zero value detection device comprises an impulse voltage generator, an insulator unit and a measurement module, the output end of the impulse voltage generator is connected with the input end of the insulator unit, and the output end of the insulator unit is connected with the measurement module; the device for detecting the zero value of the early defective insulator / the partially degraded insulator comprises an impulse voltage generator, a Rogowski coil, an integrator and an oscilloscope, the Rogowski coil is arranged on a wire to be detected in a surrounding mode, the output end of the Rogowski coil is connected into the integrator, and the output end of the integrator is connected with the oscilloscope. The invention provides a porcelain insulator zero value detection method taking a high-frequency component as a criterion, and the method can achieve the quick and reliable detection of whether the value of the insulator is zero or not.

The invention discloses a point location level lightning current monitoring device and method for a railway signal lightning protection branching cabinet, which are corresponding schemes, in the scheme, based on a laminated PCB Rogowski coil, the layout space can be saved, the electromagnetic compatibility can be enhanced, and the accurate measurement capability can be ensured; moreover, through a non-stationary signal adaptive processing algorithm, the time-frequency analysis performance can be improved, the real-time processing requirement can be met, and the high-frequency resonance characteristics in the lightning current waveform can be accurately extracted. In addition, through synchronous acquisition and processing of three paths of signals, full-dimension monitoring can be realized, and point-to-point fault attribution is realized.

The invention relates to the technical field of guide rail meter testing, in particular to a proportional operational amplifier circuit for simulating Rogowski coil signal output and a testing device, which comprises a current sampling loop for converting input current into voltage analog signal output, and a proportional amplification loop connected with the output end of the current sampling loop, and the analog module is used for amplifying an input voltage analog signal by an amplification coefficient K and then outputting the amplified voltage analog signal, and the amplification coefficient K is matched with the sensitivity coefficient S of the Rogowski coil to be simulated. Through the collaborative design of the high-precision current transformer and the proportional operational amplifier circuit, the primary side test current is reduced to below 50A, and meanwhile, a voltage signal which is equal to a Rogowski coil in proportion is accurately generated through the proportional operational amplifier circuit. According to the design scheme, the final test effect can be achieved by applying the current of 0.04-50A, the test environment is safer compared with the test environment with the large current of 500A, and the service life of the test bench body is protected.

The invention relates to an anti-electromagnetic interference Rogowski coil winding method and an anti-electromagnetic interference Rogowski coil thereof.The anti-electromagnetic interference Rogowski coil winding method comprises the following steps that an enameled wire is continuously wound to form a plurality of hollow coils which are connected with one another, and each hollow coil comprises single coil layers which are continuously wound on a coil jig and are arranged in order according to the wire diameter; after winding of each single coil layer is completed, the next single coil layer is reversely wound on the outer side, the adjacent single coil layers on the inner side and the outer side are arranged in order, the number of the single coil layers is an odd number, and the number of the single coil layers is larger than or equal to 3; continuously winding a next hollow coil on a next coil jig which is staggered with the coil jig up and down as well as front and back; the plurality of coil jigs are sequentially arranged in a step shape, the plurality of hollow coils are taken off from the coil jigs after being wound on the plurality of coil jigs, and automatic production is completed. Therefore, the capability of resisting external magnetic field interference can be better improved.

The invention relates to a low-voltage line emergency power supply non-inductive access system, which comprises a Rogowski coil sensor I, a Rogowski coil sensor II, an emergency power supply switching switch QF2, an emergency power supply non-inductive access auxiliary device, a puncture type wire clamp with an insulating handle and an overhead conductor, on the load side of a low-voltage line, a puncturing type wire clamp with an insulating handle directly penetrates through a wire insulating layer, and an overhead wire, an emergency power supply switching switch QF2 and an emergency power supply are electrically connected to establish a temporary conductive channel; the central processing unit compares whether the phase sequence, phase, voltage and frequency of the power grid main line are matched with those of the emergency power supply, if yes, the central processing unit outputs a signal to control an emergency power supply on / off switch QF2 to be switched on through a remote control output module, so that the emergency power supply supplies power to the load side of the low-voltage line; an emergency power supply grid-connected loop is formed on the premise of not interrupting power supply of a main line of a power grid, zero-power-failure access of the emergency power supply is achieved, access is rapid and convenient, and reliability is high.

The invention discloses a Rogowski coil zero-region current sensor and a design method thereof, and relates to the technical field of current sensors, and the Rogowski coil zero-region current sensor comprises a central conductor, an insulating sleeve, a coil skeleton and a coil winding. The insulating sleeve coaxially sleeves the middle part of the central conductor, and the two ends of the central conductor are electric connection ends used for connecting an arc extinguish chamber test loop in series; the coil framework coaxially sleeves the periphery of the insulating sleeve; the coil winding is wound on the coil framework and is used for detecting current; the central conductor is made of a copper alloy material, and the surface of the central conductor is plated with silver; the ratio of the length to the outer diameter of the coil winding is 2-3; the mutual inductance coefficient of the current sensor is 10-50 [mu] H, and the dynamic range of output signals of the signal output end of the coil winding is-10 V to 10 V. The wide dynamic range, the high sensitivity and the broadband characteristics can be considered, and the characteristics of stable structure and good safety are achieved.

The application discloses a bandwidth-adjustable self-integration Rogowski coil device, which comprises a Rogowski coil body, an integration inductor and a sampling resistor, and electrical parameters of the integration inductor and the sampling resistor are adjustable; the integration inductor is connected in series with an output end of the Rogowski coil body; and the sampling resistor is connected in series with an output end of the integration inductor. The self-integration circuit is formed by connecting the integration inductor and the sampling resistor in series in the Rogowski coil, the induced signal is directly integrated into a current signal output, and an external complex operational amplifier and other elements are not needed, so that the circuit design is obviously simplified, the stability and reliability of the system are improved, and meanwhile, the integration effect of the device is ensured by determining the value range of the integration inductor and the sampling resistor.

The utility model discloses a pair of open type Rogowski coil discharge detection calipers, relates to the field of alternating current detection, and aims to solve the problems that an existing Rogowski coil cannot be installed remotely to reduce the risk of electric shock and the measurement precision is not up to the standard due to the fact that the Rogowski coil is easy to deform due to extrusion during measurement. The clamp comprises a clamp body, a fixed clamp and a movable clamp, the fixed clamp is fixed to the upper end of the clamp body, and the movable clamp is slidably connected to the clamp body; a Rogowski coil I is installed in the fixed clamp, a fixed contact is arranged at the upper end of the fixed clamp, the Rogowski coil I is connected with the fixed contact, a Rogowski coil II is installed in the movable clamp, a movable contact is arranged at the upper end of the movable clamp, the Rogowski coil II is connected with the movable contact, and the movable contact can be connected with the fixed contact in an inserted mode. The method is used for detecting the current of the alternating current line.

The utility model discloses a current sensor. The current sensor comprises a skeleton; the magnetic core is arranged in the framework, a detection channel is formed in the magnetic core, and the detection channel is used for allowing a transmission wire with current to be detected to penetrate through so that the transmission wire with the current can generate an induced magnetic field under the action of electromagnetic induction; the coil comprises a wire-removing wire turn and a wire-returning wire turn, and the wire-removing wire turn and the wire-returning wire turn are arranged in a crossed manner and are wound on the framework, so that the coil generates induced current under the action of an induced magnetic field; and the detection circuit is connected to the coil and is used for detecting the induction current generated by the coil. According to the technical scheme of the utility model, the problem that the measurement result of the current sensor of the wind power plant has errors due to the fact that the Rogowski coil is easily interfered by an external magnetic field during measurement in the background technology is solved.

The embodiment of the application discloses an insulation electric leakage monitoring device, comprising: a Rogowski coil, a conditioning module, a comparison module and a processing module; the Rogowski coil is used for outputting a first voltage signal according to the real-time current of an insulator; the input end of the conditioning module is connected with the output end of the Rogowski coil, and is used for performing differential processing on the first voltage signal and outputting a second voltage signal; the input end of the comparison module is connected with the output end of the conditioning module, and is used for outputting a comparison signal according to the second voltage signal; the first input end of the processing module is connected with the output end of the comparison module, and is used for acquiring the comparison signal; the second input end is connected with the output end of the conditioning module, and is used for collecting the second voltage signal according to the comparison signal, and determining whether the insulator leaks according to the collection result. The above technical scheme realizes online monitoring of whether the insulator leaks, and improves the detection efficiency and detection accuracy of the insulator electric leakage.

The utility model belongs to the technical field of electronic sensing, and particularly discloses a current sensing device. The current sensing device comprises a first PCB type Rogowski coil, a second PCB type Rogowski coil and a third Rogowski coil, wherein the first PCB type Rogowski coil and the second PCB type Rogowski coil are stacked at intervals to form a tubular structure, and the third Rogowski coil is uniformly wound on the tubular structure; and the first PCB type Rogowski coil and the second PCB type Rogowski coil are connected in series according to a stacking sequence and then are connected in series with the third Rogowski coil. The third Rogowski coil and the PCB type coil are combined, and the PCB type coil serves as a winding framework of the third Rogowski coil, so that the induction signal of the Rogowski coil can be increased to the maximum extent in a limited space size, and the sensitivity of current sensing is improved.

The invention discloses an intelligent diagnosis and treatment strategy generation system for a frequency stop line, which belongs to the technical field of line diagnosis and comprises a data acquisition module which is integrally provided with a high-frequency magnetic field sensor, a Rogowski coil galvanometer and an infrared thermometer and is used for acquiring line traveling wave signals, temperature and electromagnetic field data in real time; time-space information is synchronized through the three-channel radio frequency GPS module; the feature extraction module is used for performing wavelet packet decomposition and noise reduction on the traveling wave signal, calculating high-frequency signal information entropy based on a beat frequency attenuation principle and extracting a fault feature vector; the fault diagnosis module is used for inputting the feature vector into a deep neural network model through multi-criterion information fusion, and outputting a fault type and a positioning coordinate; and the strategy generation module is used for generating a governance strategy library. According to the invention, high-frequency transient characteristics can be captured, complex faults of high-resistance faults and broken line resonance are avoided, and the omission ratio is greatly reduced.

Various current measurement systems and methods of signal processing are disclosed. In one example, there is a current measurement system that includes a filter with a corner frequency within the operating frequency range of the current measurement system. This provides a system with good SNR, whilst also preventing or reducing the likelihood of output saturation during large di / dt spikes. The system further includes an equaliser arranged to compensate for the phase and / or magnitude response of the filter within the operating frequency range.

The invention discloses an ultra-wideband transient multi-electromagnetic physical quantity synchronous measurement method and system, and the method comprises the steps: designing an electric field sensor based on a monopole rod-shaped electrically small antenna principle, and designing a magnetic field sensor based on a Faraday's law of electromagnetic induction; designing a voltage sensor based on a self-integration mode, and designing a current sensor based on a broadband Rogowski coil; based on a digital sampling technology of an FPGA, a digital processor is designed, sampling data collected by an electric field sensor, a magnetic field sensor, a voltage sensor and a current sensor are collected through the digital processor, the sampling data are transmitted to an upper computer through a QSFP module, and the sampling data are processed and displayed through the upper computer. The scheme can be effectively applied to application scenes of transient electromagnetic environment online monitoring, fault diagnosis, radiation source accurate positioning and the like of high-voltage power equipment.

A current sensor includes: a printed circuit board (PCB) having a central hole that allows a conductor, which is a measurement target, to pass therethrough; a Rogowski coil part formed to be wound in a predetermined direction while keeping a predetermined distance from the central hole; and a shield part formed outside and inside the Rogowski coil part and configured to perform an electrical shielding function, and the shield part includes a shield bridge formed to connect separate spaces.

The invention discloses an electronic current transformer based on wavelength division multiplexing, which comprises a Rogowski coil, an acquisition module and a merging unit, in the acquisition module, an acquisition processing unit is connected with the Rogowski coil, and the acquisition processing unit is used for acquiring an output signal of the Rogowski coil and converting the output signal into a first optical signal. And the power supply module is connected with the acquisition processing unit and is used for providing energy for the acquisition processing unit by using the second optical signal. The first wavelength division multiplexer is connected with the acquisition processing unit and the power supply module. The first wavelength division multiplexer is used for combining the first optical signal and the second optical signal. In the merging unit, a second wavelength division multiplexer is connected with the first wavelength division multiplexer through an optical fiber, and the second wavelength division multiplexer is used for separating the first optical signal from the second optical signal. The signal processing unit is used for processing the first optical signal. The energy supply unit is used for providing a second optical signal. According to the mutual inductor, the number of connectors and potential fault points are reduced, and the stability of the mutual inductor is improved.