212 results about "Rogowski coil" patented technology

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 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 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 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.

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 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 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.

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.

The utility model provides a current measuring device used for a power module, comprising a PCB board comprising a first shielding structure, a Rogowski coil layer and a second shielding structure, the Rogowski coil layer is arranged between the first shielding structure and the second shielding structure, the Rogowski coil layer is provided with a plurality of Rogowski coils, the plurality of Rogowski coils and the plurality of chips are arranged in a one-to-one correspondence manner, the first shielding structure is provided with a plurality of first shielding layers, and the second shielding structure is provided with a plurality of second shielding layers; the transmission assembly comprises a cable and a signal processing part, the first end of the cable is connected with the PCB, and the second end of the cable is connected with the signal processing part. According to the technical scheme provided by the invention, the problem that the current measurement result is inaccurate due to interference during measurement of the Rogowski coils caused by inductive coupling interference of two adjacent Rogowski coils under the condition that a plurality of Rogowski coils exist in electrostatic shielding in the related technology can be solved.

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 utility model discloses a current sensor housing and a current sensor. The current sensor housing comprises at least two housing units which are detachably connected. The at least two shell units are sequentially overlapped from top to bottom; the shell unit comprises a shell body and a connecting piece; a mounting cavity is formed in the shell body and is used for mounting a Rogowski coil or an expansion coil; one side of the shell body extends outwards to form a bulge, and an operation space is formed between the bulge and the mounting cavity; the connecting piece is mounted on the side, away from the mounting cavity, of the protrusion. The automatic cleaning device can be used for automatically cleaning and saving manpower.

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.

The invention relates to the technical field of motor monitoring and control technologies, and discloses a switched reluctance motor monitoring system and method. According to the switched reluctance motor monitoring system and method, an integrated monitoring system integrating multi-physical-quantity synchronous sensing, high-speed acquisition, edge intelligent diagnosis and active fault tolerance is constructed, so that comprehensive and accurate monitoring is realized; a wide-band and high-precision Rogowski coil, an isolation type voltage sensor and a dual-redundancy position sensor are adopted; by combining distributed temperature and vibration sensing, multi-dimensional synchronous accurate sensing of electrical, mechanical and thermal states is realized, a high-quality data basis is provided for fault diagnosis, the diagnosis is real-time and intelligent, high-speed synchronous acquisition based on the FPGA ensures signal time sequence consistency, wavelet packet decomposition and a lightweight convolutional neural network are fused on the edge side, and the fault diagnosis accuracy is improved. Features can be rapidly extracted locally, faults can be identified, and cloud dependence and diagnosis delay are greatly reduced.

1. Name of the designed product: joint device for electric meter (multi-arch cavity combined Rogowski coil). 2. Use of the designed product: for measuring alternating current. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

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 invention discloses a coaxial dual-coil structure and a dual-channel broadband current measurement system and method, and the structure comprises two sets of PCB Rogowski coils which are coaxially disposed in a same mechanical housing, and the two sets of PCB Rogowski coils are a first Rogowski coil and a second Rogowski coil. The first Rogowski coil is a high-frequency measurement Rogowski coil and is used for detecting lightning impulse signals; the second Rogowski coil is a power frequency measurement Rogowski coil and is used for detecting a power frequency signal; the first Rogowski coil adopts a self-integration working mode, the second Rogowski coil adopts a composite integration working mode, the first Rogowski coil and the second Rogowski coil share the same hole, a high-voltage center conductor penetrates through the hole to provide a measured current, and the first Rogowski coil and the second Rogowski coil suppress electromagnetic coupling through a middle composite shielding partition plate and a preset axial distance. According to the invention, a coaxial double-coil structure, double-channel frequency division processing and intelligent identification fusion are combined, and simultaneous measurement of a power frequency low-frequency signal and a high-frequency transient impact signal is realized.

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 invention discloses a plugboard type Rogowski coil current transformer with a magnetic core, which relates to the technical field of current transformers, and comprises a PCB (Printed Circuit Board), the magnetic core, a forward winding coil and a reverse winding coil, and a first circular ring and a second circular ring on the PCB are fixed on an inner side plate and an outer side plate in an embedded manner, a group of slots on the outer sides of the first circular ring and the second circular ring are used for fixing a signal acquisition board; the adjacent forward winding structures in the forward winding coil are connected end to end, the end point of the previous forward winding structure is the starting point of the next forward winding structure, and the adjacent reverse winding structures in the reverse winding coil are connected end to end. The end point of the previous reverse winding structure is the starting point of the next reverse winding structure; the forward winding coil and the reverse winding coil are used for generating induced electromotive force; and the induced electromotive force is used for detecting the current of the wire to be detected. The winding is wound through the first circular ring and the second circular ring which are spatially isolated, stray capacitance is reduced, and therefore the bandwidth of the current transformer is increased.

The utility model discloses an auxiliary automatic eccentricity adjusting structure for a current transformer, which comprises two semicircular metal shielding cases, the two metal shielding cases are matched to form a complete annular metal shielding case, and the opposite ends of the two metal shielding cases are detachably limited and fixedly matched through a limiting and locking assembly. The other opposite ends of the two metal shielding covers form detachable locking and fixing matching through lock catches, a plurality of eccentric distance self-adjusting assemblies are arranged on the inner side of the complete circular-ring-shaped metal shielding cover at equal intervals around a shaft, and the eccentric distance self-adjusting assemblies are all arranged in the radial direction of the metal shielding cover. And the eccentric distance self-adjusting assembly and the metal shielding cover form elastic limiting fit, so that the eccentric distance can be automatically adjusted, and the auxiliary wire is always located in the middle of the Rogowski ring.

The application provides a closed-loop control integral system with amplitude compensation function, mainly comprising a non-ideal integrator, a gain-variable amplifier and a control signal generator; the non-ideal integrator receives a Rogowski coil output signal and performs integral operation on the signal to suppress integral overflow caused by interference direct current; after receiving a control signal generated by the control signal generator, the gain-variable amplifier performs amplitude gain adjustment on the output signal of the non-ideal integrator based on the control signal to compensate amplitude gain error caused by temperature drift and time drift of the non-ideal integrator; the control signal generator collects various electrical parameters of the Rogowski coil output end and combines various electrical parameters of the output signal of the gain-variable amplifier to generate a control signal for gain adjustment control of the gain-variable amplifier. By implementing the application, errors caused by device temperature drift and aging can be compensated in real time, and the application has the advantages of high measurement accuracy, low cost and more stable performance.

1. The name of the design product: Rogowski coil (for electric energy meter). 2. The use of the design product: The design product is arranged in the electric energy meter, and is used for sampling current. 3. The design points of the design product: The shape of the product. 4. The picture or photo that can best show the design points: perspective view.

A multi-sensor integrated PCB-based electrical measurement apparatus for measuring currents and voltages of electrical power lines. Current is measured using Rogowski coil based current sensors that detect the magnetic field encircling the electric power line. Voltage is measured using patch PCB electric field sensors that detect the electric field emanating from the electric power line.