25results about "Effective value measurements" patented technology

This invention discloses an intelligent data synchronization system and method for voltage monitoring instruments, relating to the field of intelligent data synchronization technology. The method includes the following steps: acquiring the original sampling sequence; constructing a preset step-size sliding window; generating filter coefficients based on the statistical characteristics of sampling points within each window and performing weighted calculations to obtain the filtered output value at the window center point, forming a preprocessed sequence; detecting the sign change of adjacent sampling points in the sequence; marking valid zero-crossing points; extracting an integer number of complete cycle sampling data as a cycle data block; calculating the theoretical number of sampling points based on the rated frequency and sampling rate and setting a tolerance range; comparing the actual number of points to preliminarily determine the synchronization effectiveness; calculating the actual frequency from the preliminarily valid data block; verifying the rated frequency deviation to confirm synchronization; simultaneously calculating its effective value; comparing it with a preset voltage threshold to determine whether the data is valid. This invention achieves intelligent synchronization of sampling data.

This invention discloses a method and system for monitoring residual current of AC power supply in stations, relating to the field of electrical parameter measurement technology. The method includes: performing micro-amplitude reference self-check and acquisition deviation correction based on a time-scale aligned monitoring set; stitching together the spectral domains of low-frequency and high-frequency channels to generate a wideband calibrated residual current set; extracting frequency domain and transient features from the wideband calibrated residual current set; and using gated fusion to perform sparse inversion localization to obtain suspected abnormal feeders and target feature vectors; performing hierarchical cause discrimination based on the target feature vectors and suspected abnormal feeders; quantifying the deviation degree of the target feature vectors; and generating a handling judgment set. This invention generates self-check response records and forms acquisition deviation correction information through micro-amplitude reference self-check, achieving consistent calibration correction between low-frequency and high-frequency channel data to obtain a wideband calibrated residual current set, thereby stabilizing the wideband measurement reference.

A battery defect diagnosis apparatus according to an embodiment of the present invention can calculate a reaction amount of respective batteries stored for a predefined period at a reference temperature, generate a plurality of groups by grouping the batteries on the basis of the reaction amount of the respective batteries, obtain a representative value for each battery group on the basis of a voltage change of each of the batteries within the battery group, and determine, on the basis of the representative value, whether the battery group is defective.

The application discloses a kind of multi-channel adaptive real-time signal processing methods, comprising the following steps: to multiple analog input signals are synchronously sampled, obtain multi-channel digital signal;The multi-channel digital signal is adaptively filtered and processed, and low-pass filtering and median filtering are executed in parallel for the digital signal of the same channel;Signal zero-crossing point is identified based on zero-crossing detection principle, and multi-cycle synchronous measurement strategy is used, and the frequency value of each channel signal is calculated according to the frequency range of multi-channel digital signal;To the filtered multi-channel digital signal, square sum is accumulated to sampling value using time sliding window, and the effective value of each channel signal is calculated by hardware accelerated square root algorithm;The frequency value and effective value calculated by each channel are output through the preset communication interface or analog output channel.

The application provides a visual control-based test method and system for a non-stop spare power automatic switching device, which proposes a visual control-based test method for a non-stop spare power automatic switching device, connects a voltage collection end of a test device to a power supply side voltage transformer secondary output terminal of the spare power automatic switching device, simultaneously acquires a current transformer secondary current signal and inputs the current transformer secondary current signal to the test device, and pre-connects a current output end to a protection side current input terminal. During the test process, actual voltage and current are monitored in real time through a graphical user interface, and the test device synchronously outputs simulated voltage and current. After being started, the test device automatically applies test working conditions to the spare power automatic switching device according to parameters, synchronously collects test data, and finally calculates performance indexes based on the test data and generates a test report. The method realizes comprehensive, accurate and safe testing of the spare power automatic switching device without interrupting power supply.

A battery diagnosis device according to one embodiment disclosed herein comprises: memory for storing at least one instruction; and at least one processor for executing the at least one instruction. The at least one processor can: identify changed capacities during a process in which target battery cells included in a target battery unit change from a first voltage to a second voltage, and the total capacities of the target battery cells; identify differences between predicted total capacities, which are total capacities of the respective target battery cells predicted through a learning model, and total capacities of the target battery cells corresponding to the predicted total capacities; and diagnose the state of the target battery unit on the basis of the differences.

In accordance with a first aspect of the present disclosure, a near field communication (NFC) device is provided, comprising: an NFC transceiver configured to communicate with an external NFC device and to apply at least one transceiver parameter when communicating with the external NFC device; a calibration unit operatively coupled to the NFC transceiver and configured to calibrate the NFC transceiver; wherein the calibration unit is configured to calibrate the NFC transceiver by causing the NFC transceiver to apply different values of the transceiver parameter, measuring a noise level in the NFC transceiver for each applied value of the transceiver parameter, and selecting an optimal value from the applied values of the transceiver parameter in dependence on the noise level measured for each applied value. In accordance with a second aspect of the present disclosure, a corresponding method of operating an NFC device is conceived.

A hardware-based detection system (10) includes, among other things, a signal-generating circuit (22, 38, 54, 58, 62) for generating a signal which is functionally related to current in a motor winding, a reference current, and a duration of time. The system may also include a comparator circuit (66) for comparing the generated signal to a reference signal, and for thereby detecting an over-temperature condition in the motor winding. A method of operating a detection system (10) is also described. If desired, the detection system (10) may be completely implemented in hardware using an analog circuit architecture.

The invention relates to measuring technology, and can be used for measuring the root-mean-square values of electrical quantities of direct current and high-frequency alternating current, such as current, voltage and power. A thermoelectric measuring device comprises a resistive element and a thermoelectric module, wherein the resistive element is designed to be capable of emitting heat when an electrical signal to be measured is supplied thereto, and is in thermal contact with a sensitive side of the thermoelectric module, and the thermoelectric module is designed to be capable of measuring the heat emitted by the resistive element and is disposed on a heat dissipating base. The thermoelectric measuring device is highly sensitive to heat flux and provides highly accurate measurement of electrical quantities.

A power detector for detecting the RMS power of an AC voltage includes a transconductor configured to receive the AC voltage and to provide a first current to a node with a non-linear relation between the first current and the voltage. A current output digital to analog converter is configured to receive a digital signal and to provide a second current to the node. A low pass filter is coupled to the node, and an inverter is coupled to the node and configured to provide a binary signal.

The application discloses a distribution network fault intelligent diagnosis method based on multi-source heterogeneous data fusion and relates to the technical field of distribution network fault diagnosis, and comprises the following steps: a double-section buffer structure containing a forward buffer area and a backward buffer area is established, line electrical quantities are collected in real time, and the forward buffer area is written in cycles; real-time analysis is conducted on the data of the forward buffer area, and suspicious signs of transient disturbance events are detected; when the suspicious signs are detected, the data of the forward buffer area is frozen, and whether the event starting condition is met is judged based on the data; if the event starting condition is met, the backward buffer area is started to record waves, and transient buffer data are obtained; the frozen forward buffer area data and the transient buffer data are time-aligned and corrected, and complete transient waveforms are formed; through the method of establishing double-section transient buffer, micro-amplitude fluctuation detection and forward-backward data splicing and correction, the problems that the intermittent flash-off and flash-on fault process cannot be recorded completely and the precursors are difficult to capture are solved.

A method and system for monitoring an insulation resistance (IR) of an e-machine includes a bridge circuit arrangement. A voltage across the bridge circuit arrangement is detected. The IR is calculated as a resistance in the bridge circuit arrangement associated with the detected voltage.

An apparatus including a first AC-to-DC converter, a first DC-to-AC converter and a second AC-to-DC converter, the first AC-to-DC converter connected with a low voltage arm of a high voltage divider to obtain a voltage measurement signal, the first DC-to-AC converter configured to output a modulated signal of the voltage measurement signal, the second AC-to-DC converter configured to output a demodulated signal of the voltage measurement signal; a high-frequency transformer including a primary coil connected with an output terminal end of the first DC-to-AC converter and a secondary coil connected with an input terminal of the second AC-to-DC converter; and a controller configured to control switching devices of the first DC-to-AC converter to control a turn-on sequence of each switching device, to calculate signal parameters, and to output the calculated signal parameters.

This invention relates to a method and apparatus for calculating the effective values ​​of current and voltage in a smart meter chip, belonging to the field of smart meter metering. The method aims to solve the problems of insufficient calculation accuracy, poor real-time performance, and high hardware resource consumption in existing technologies under conditions of power grid frequency fluctuations and harmonic distortion. The technical solution includes: inputting the voltage or current digital signal obtained from analog-to-digital conversion into a multiplication module for point-by-point squaring; then filtering out high-frequency AC components to extract the DC component using a second-order low-pass filter; finally, performing a square root operation on the DC component to obtain the effective value of voltage or current. The apparatus includes a multiplication module, a second-order low-pass filter, and a square root module. This invention can significantly improve calculation accuracy under non-ideal power grid conditions, greatly reduce hardware resource consumption and chip area, while improving system real-time performance, response speed, and robustness to various power grid disturbances.

The application provides a power distribution box switch cabinet fault detection method based on current effective value and waveform distortion, acquires effective value and distortion rate sequence by synchronously collecting current data in combination with signal processing, and extracts phase difference and amplitude ratio data through correlation analysis, so as to accurately classify the abnormal type as line fault or poor contact; meanwhile, the application constructs a danger level matrix through feature fusion, judges a fault evolution path by using time sequence analysis, dynamically optimizes correlation model parameters, realizes real-time monitoring and early warning on subsequent data, generates an alarm signal and locates a potential fault type when the distortion rate continuously exceeds a threshold value.

The application discloses a kind of system and method for detecting effective value of three-phase voltage of power grid, through three-phase voltage detection circuit, corresponding sinusoidal wave phase voltage detection signal of each phase is taken and input to MCU chip, amplitude is between 0~;Within a cycle, after the negative half wave of sinusoidal wave is reversed, the AD value of sinusoidal wave signal is taken n, the AD value of all sample numbers is added, and then divided by sample number, i.e. average value is calculated, average value is multiplied by 0.9, and then the effective value of each phase voltage is back calculated by AD value, the effective value error of calculated voltage is within 0.5%, high accuracy, calculation only has addition and subtraction, the computing power of MCU is little, time is fast, does not occupy too many MCU resources, and the implementation cost of scheme is low.

The application discloses a mine-used electrical cabinet system based on mechatronics, and relates to the technical field of mine-used electrical equipment. The system constructs a starting parameter data set in a starting window in a starting parameter acquisition module, extracts and calculates features of a starting stage in a starting impact controllability discrimination module, and constructs a starting impact controllability discrimination index CSC, thereby realizing comprehensive quantitative analysis of the starting impact in the amplitude dimension and the time dimension. Compared with the existing mine-used electrical cabinet which only determines protection according to a single current threshold, the application can accurately distinguish non-fault starting impact generated in a normal starting process from a real electrical fault without changing existing protection setting parameters, thereby avoiding misjudgment of tolerable starting behavior as fault tripping, and improving the accuracy and engineering adaptability of starting stage discrimination.

A heat flux sensor (10) and method of using the heat flux sensor (10). The heat flux sensor (10) includes thermoelectric element (12) having an anisotropic thermoelectric material with width, length, and thickness dimensions. The width and length dimensions define opposing first and second flux transceiving surfaces (16). The width and thickness dimensions define opposing first and second electrode surfaces (18). Each of the first and second electrode surfaces (18) are configured to intersect each of the first and second flux transceiving surfaces (16). The thermoelectric element (12) is configured so that a heat flux (32) passing between the first and second flux transceiving surfaces (16) causes a voltage to appear between the first and second electrode surfaces (18), and so that the length dimension is at least two times the thickness dimension.

The application discloses an AC analog signal measurement method and device, a medium and a terminal, relates to the field of electric signal measurement, and mainly aims at improving the problems of single function and slow response speed of the existing hardware direct measurement method and the problem of being unable to simultaneously meet speed and accuracy requirements of the software calculation and analysis method. The signal is sampled at a fixed frequency, and then the original sampling value is corrected by using an expected sampling frequency and a local signal change fitting curve to obtain an actual value corresponding to the expected sampling frequency. The sampling is performed at the fixed frequency, so that the hardware cost is reduced, the response speed is improved, the chip update rate is no longer limited, and the response speed is improved. The effective value and the phase angle can be calculated once per sampling, so that the response speed is improved, and the measurement accuracy is ensured without sacrificing the accuracy for the speed.

The application relates to the technical field of arc detection, and discloses a power distribution cabinet internal arc fault rapid identification method and system. The method comprises the following steps: collecting a dry circuit current signal, branch current signals, an arc light intensity signal and a sound pressure signal, performing harmonic decomposition on the branch current signals to obtain branch harmonic intensity indexes and a dry circuit fundamental wave effective value; performing summation on the branch harmonic intensity indexes and performing division on the dry circuit fundamental wave effective value to obtain a characteristic dilution index D; assigning dynamic weights to each fault indication value according to the size interval of the characteristic dilution index D and performing weighted summation to obtain a comprehensive confidence C; determining a confirmation counter threshold value according to a dilution change rate; when the number of windows in which the comprehensive confidence C continuously exceeds the decision threshold value reaches the confirmation counter threshold value, outputting a stable fault decision result, positioning a fault branch and outputting a tripping instruction. The application improves the accuracy and decision stability of the power distribution cabinet internal arc fault identification under complex load working conditions.

A radiofrequency detector comprises a squarer circuit comprising first and second branches coupled between a voltage supply and ground, the first branch comprising at least a first squarer transistor receiving a RF sinusoidal input voltage, the first squarer transistor being coupled to the voltage supply through a respective load, the second branch comprising a second reference transistor being coupled to the voltage supply through a respective load, an output voltage being formed at an output node of the first branch and a reference voltage being formed at a respective output node coupled to the load of the second branch, a squared voltage being obtained by a difference voltage of the output voltage and reference voltage, wherein the circuit is configured to feed back to a control electrode of the second reference transistor a feedback signal that is a function of the difference voltage.

This application relates to the field of switch fault detection technology, and particularly to a method, device, and storage medium for detecting grid-connected switches in an energy storage system. The method includes controlling the controller to send a grid-connected closing signal to the grid-connected switch; when the battery connected to the inverter meets a first preset battery condition, determining whether a grid-connected switch has experienced a grid-connected closing fault based on the inverter's inverter grid-connected voltage condition, the inverter grid-connected current condition, and the duty cycle change condition of the energy storage system's grid-connected loop output; and when the battery connected to the inverter meets a second preset battery condition, determining whether a grid-connected switch has experienced a grid-connected closing fault based on the inverter grid-connected current condition and the duty cycle change condition of the energy storage system's grid-connected loop output. This application can detect whether the grid-connected switch has successfully engaged in a timely and accurate manner at the moment of switching between grid-connected and off-grid modes.