78results about "Voltage-current phase angle" patented technology

This invention relates to a system and method for calibrating energy meters, designed to enhance the accuracy of electrical power measurements. The system incorporates a computing device with specialized calibration software, interfaced with multiple energy meters via a network switch. Each energy meter is equipped with a CPU and DSP, facilitating precise phase angle measurements. A configurable three-phase reference source, connected via power cables, supplies standard calibration signals to the meters. The DSP measures phase angles based on calibration commands triggered by control signals received by the CPU. These measurements are then transmitted to the computing device, which calculates necessary offset corrections. The corrections are subsequently communicated back to the CPU for adjustment of the energy meters' analog-to-digital converter settings, thereby ensuring the meters' outputs are accurately aligned with calibrated standards. This system provides a robust framework for reliable, high-precision energy meter calibration.

The present application relates to the technical field of power distribution network fault detection, and particularly relates to a power distribution network fault positioning method and system based on consistency constraints, an electronic device and a medium; the method comprises: obtaining operation data of a power distribution network, and constructing a benchmark power flow model based on the operation data; in response to a fault occurring in the power distribution network, collecting measurement data of the current power distribution network; based on the measurement data and the benchmark power flow model, calculating voltage changes of each node in the power distribution network through a first estimation path and a second estimation path respectively, and generating voltage change estimation results of the first estimation path and the second estimation path; based on the voltage change estimation results, calculating a fault positioning result of the power distribution network. In this way, the technical problem of high requirement for the density of measurement device layout existing in the single-phase ground fault positioning technology of the existing power distribution network is solved, and the accuracy, robustness and engineering practicability of fault positioning under limited measurement conditions are improved.

This utility model discloses a comprehensive testing device for high-voltage signal acquisition and testing of instrument transformers, including a chassis, a control unit, a test display unit, a test interface, a power supply unit, and a power supply. The control unit includes a processor. The test display unit includes a phase meter and a ratio / difference meter, which are electrically connected to the processor. The test interface includes a first input terminal, a second input terminal, a first output terminal, a second output terminal, a third output terminal, and a fourth output terminal, which are electrically connected to the processor. The power supply unit includes an isolation transformer and a switching power supply. The primary winding of the isolation transformer is electrically connected to the power supply, and the secondary winding of the isolation transformer is electrically connected to the switching power supply. The processor, phase meter, and ratio / difference meter are all electrically connected to the switching power supply. This utility model has a simple structure and can simultaneously display two parameters, phase and ratio / difference, thus improving production efficiency.

By using a detector and voltmeter that do not require high-speed trigger operation, the present invention provides a phase characteristic measurement device that avoids the need for large-scale equipment used for phase measurement and enables relatively inexpensive phase measurement. [Solution] The system includes a first detector 11 that receives and detects three patterns of three-tone signals: a first three-tone signal obtained by combining three waves with angular frequencies ω1, ω2, and ω3 (where ω2-ω1=ω3-ω2=Δω), a second three-tone signal in which each tone has a phase offset, and a third three-tone signal having a different phase offset from the second three-tone signal; a BPF 12 that passes only the beat component of the signal output from the first detector, where the angular frequency difference Δω is between adjacent waves of the three-tone signals; a second detector 13 that detects the power of the beat component that has passed through the BPF 12; a voltmeter 14 that measures the voltage of the signal output from the second detector; and a phase calculator 15 that calculates the phase based on the measured voltage values ​​of the three patterns.

The application discloses a kind of single-phase power supply network voltage included angle measurement method and system, is specifically related to electronic measurement field.It includes: based on many single-phase electric meters in station area to construct communication network, phase angle request instruction is issued to the first electric meter as reference phase by concentrator, the first electric meter sends phase synchronization data frame carrying target address and synchronization identification to other single-phase electric meters by RS485 bus;Other single-phase electric meters start timer after identifying synchronization data frame, and stop timing when the zero-crossing point of preset direction appears in its access phase line voltage, and the time interval obtained is returned to the first electric meter.The first electric meter synchronously executes zero-crossing detection and obtains reference time interval, calculates the phase angle of each phase voltage relative to reference phase voltage based on multiple time interval difference values and preset power frequency cycle, and uploads phase angle data to concentrator.

Method (100) for testing the functionality of an electrical insulation of phases (20) of an electric machine (14) of an electric drive system (12) for a motor vehicle (10), wherein the method (100) is characterized by the following steps: - Locking (102) a rotor (18) of the electric machine (14) against a rotational movement, - Applying (104) at least two phases (20) of the electric machine (14) with at least one electrical impulse, - Measuring (106) an impulse response between the at least two phases (20) of the electric machine (14) which are subjected to at least one electrical impulse, - Comparing (108) the measured impulse response with at least one predefined impulse value, wherein the at least one predefined impulse value is indicative of the functionality of the electrical insulation of the at least two phases (20) of the electric machine (14), and - Output (110) of a test result of the functionality of the electrical insulation of at least two phases (20) of the electric machine (14) based on the comparison.

The application relates to the technical field of circuit breakers, and discloses a circuit breaker control circuit, a circuit breaker and a power supply system, wherein the circuit breaker control circuit comprises a first metering module, a second metering module, a switch and a controller; the input end of the first metering module is connected with a power grid side power supply; the communication end of the first metering module is connected with the common end of the switch; the input end of the second metering module is connected with a photovoltaic side power supply; the communication end of the second metering module is connected with the first selection end of the switch; the second selection end of the switch is connected with the first communication end of the controller; the first selection end of the switch is connected with the second communication end of the controller; the controller controls the switch to switch when measurement is performed; phase measurement instructions are simultaneously sent to the first metering module and the second metering module through the second communication end; and a phase difference is obtained according to a first measurement signal of the first metering module and a second measurement signal of the second metering module.

This invention relates to the field of in-situ impedance testing technology for energy storage batteries. To address the current difficulties in achieving rapid tracking of wideband excitation signals and the inaccurate identification and measurement of electrochemical parameters, it provides a battery in-situ impedance testing method and system based on adaptive phase compensation. The method includes acquiring the initial reference current and actual sampled current of the battery charging and testing system; iteratively calculating the real-time phase lag angle and generating a corrected reference current command accordingly; predicting the current response in two steps based on a discrete mathematical model of the full-bridge converter in continuous conduction mode; and optimizing the switching state corresponding to the voltage vector that minimizes the composite cost function to drive the switching transistors of the full-bridge converter. This method balances fast dynamic response with zero phase error tracking, meeting the high-precision requirements of in-situ EIS testing of energy storage batteries.

This invention discloses a flexible cable aging state detection system based on electromagnetic feature extraction, comprising: an electromagnetic response acquisition module for acquiring multi-channel electromagnetic response signals; a preprocessing module for performing preprocessing and sliding segmentation; an electromagnetic feature construction module for performing frequency domain transformation and time-frequency transformation to construct a set of electromagnetic state vectors; an evolution trajectory construction module for constructing an electromagnetic state space and generating a set of electromagnetic state evolution trajectories; a trajectory structure representation module for constructing a set of trajectory structure representation vectors; an attraction domain construction module for constructing a stable operating attraction domain model and establishing a degradation evolution attraction domain model; and an aging state determination module for generating an attraction domain structure migration index sequence and outputting the aging state detection results. This invention utilizes electromagnetic feature extraction and attraction domain migration analysis methods to achieve flexible cable aging state detection, possessing the advantages of accurate identification and strong trend determination capabilities.

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.

The present application relates to the technical field of harmonic analysis, in particular to a power signal harmonic detection and suppression method and system based on deep learning, comprising the following steps: power distribution line voltage and current transformer output signal, analog-to-digital conversion sampling and time sorting, convolution frequency activation and harmonic channel screening, harmonic phase difference calculation, matching frequency index to generate harmonic compensation control instruction set.In the present application, the change value of adjacent window frequency activation is compared to identify the stable frequency channel, the influence of transient interference is weakened, the harmonic frequency positioning accuracy is improved, the screening result participates in the frequency domain calculation to form a phase angle sequence, the phase difference of adjacent windows forms a continuous change relationship, the stable phase difference and the disturbance phase difference are distinguished by weight and accumulated to form phase evolution data, the frequency information and the phase evolution relationship jointly participate in the compensation current calculation, the harmonic compensation current and the actual harmonic component maintain a high matching degree, and the power quality regulation stability and response capability are improved.

The application relates to a photovoltaic power station outgoing line voltage diagnosis method and system, and belongs to the technical field of supervisory control and data acquisition systems. The system realizes accurate distinction of transient disturbance and permanent fault and high-precision fault positioning by real-time acquisition of electrical quantity data through a synchronous phasor measurement unit, data preprocessing, multi-time scale feature extraction, transient and steady state identification and fault determination module analysis, and outputs diagnosis instructions based on a dynamic self-adaptive threshold and a closed-loop decision mechanism, thereby improving the accuracy, response speed and operation and maintenance efficiency of photovoltaic outgoing line voltage state diagnosis.

This invention discloses a method for estimating and optimizing the measurement failure state of a power system with location feedback. The method acquires measurement data of the first injected power of the bus and the first branch power of the branches connected to the bus in the power system; it also acquires the second injected power of the bus and the second branch power. Based on the second injected power, a power dissimilarity matrix is ​​constructed to screen out the initial critical bus failure point. After obtaining the density function value corresponding to the initial critical bus failure point using the historical branch power and density function of the initial critical bus failure point, the target critical bus failure point and critical branch failure point are screened from the initial critical bus failure points. Based on the second injected power, the second branch power, and an inertial particle swarm optimization algorithm, the optimal injected power and branch power are obtained and added. The voltage amplitude and voltage phase angle of the bus are estimated using the original measurement data after the addition.

A first detector that receives and detects 3-tone signals of three patterns of a first 3-tone signal obtained by combining three waves of angular frequencies ω1, ω2, and ω3 (here, ω2−ω1=ω3−ω2=Δω is established), a second 3-tone signal in which each tone has a phase offset, and a third 3-tone signal having a phase offset different from the phase offset of the second 3-tone signal, a BPF that allows only a beat component of an angular frequency difference Δω between adjacent waves of the 3-tone signals among signals output from the first detector to pass, a second detector that detects power of the beat component that has passed through the BPF, a voltmeter that measures a voltage of a signal output from the second detector, and a phase calculator that calculates a phase based on the measured voltage values of the three patterns.

The present disclosure relates to a method for controlling a protection system for an electrical power system comprising a transmission line, the method comprising: determining a plurality of phase angle deviations based on network models of the electrical power system during respective faults of at least three faults; determining at least three phase angle ranges based on the plurality of phase angle deviations, wherein a sum of the at least three phase angle ranges is an angle of complete rotation; and controlling the protection system for the electrical power system based on the at least three phase angle ranges.

A system for testing a transformer includes a voltage source configured to apply an input voltage to a secondary winding of the transformer, the input voltage is configured to induce a voltage in a primary winding of the transformer. A primary voltmeter is configured to measure the induced voltage in the primary winding, a plurality of secondary voltmeters configured to measure voltage in a plurality of secondary windings of the transformer, and one or more phase angle meters to simultaneously measure a plurality of phase angles between the primary voltage and each of the plurality of secondary voltages. A controller is connected to the voltage source, the primary voltmeter, the plurality of secondary voltmeters, and the one or more phase angle meters, the controller is configured to calculate a plurality of winding ratios based on the voltage and phase angle measurements, the controller is also configured to identify all secondary taps.

The application provides a digital clock phase measurement method and system based on a direct sampling technology, and a specific embodiment of the method comprises the following steps: triggering a first counter based on the edge of a first to-be-measured clock signal, using a preset sampling clock signal to sample the numerical signal of the first counter as a first timestamp signal, and the first timestamp signal is used to represent the phase of the first to-be-measured clock signal; triggering a second counter based on the edge of a second to-be-measured clock signal, using the sampling clock signal to sample the numerical signal of the second counter as a second timestamp signal; calculating the difference value of the numerical signal of each sampling point based on the first timestamp signal and the second timestamp signal, obtaining the phase difference value of the first to-be-measured clock signal and the second to-be-measured clock signal at each sampling point, and the sign of the phase difference value represents the phase leading relationship; and performing statistical analysis on the calculated phase difference value, and determining the phase difference of the first to-be-measured clock signal and the second to-be-measured clock signal according to the statistical analysis result.

This invention discloses a method and system for self-identifying the phase and polarity of motor voltage and current. The method includes: acquiring three-phase voltage and current signals, performing signal validity detection, and acquiring the fundamental phase angle data when the signal is valid; calculating the phase sequence by determining the adjacent phase difference, and generating instructions to exchange data between channels B and C to restore the positive sequence if the sequence is negative; calculating the original power angle based on the corrected positive sequence voltage and current phases; constructing multiple candidate power angles corresponding to different channel rotation and polarity reversal combinations; comparing each candidate power angle with a preset effective range of power angles, and selecting the optimal adjustment strategy that conforms to physical laws; and outputting the final phase sequence status, channel adjustment, and polarity correction instructions. This method can automatically complete phase identification, phase sequence, and polarity recognition, and is suitable for scenarios such as smart meters, frequency converters, and motor protection. It has the advantages of high reliability, strong robustness, and low resource consumption.

An electrical apparatus forming part of an AC power supply network comprises a conductor, sensors for measuring current and voltage on the conductor and a control unit. The control unit receives, from the sensors, measurements of the current and the voltage at the conductor and calculates a phase angle between them. Whether a short circuit current is occurring in the conductor is determined and a set of predetermined phase angle ranges is selected depending on whether a fault is present. Which of the ranges contains the calculated phase angle is used to determine if the power flow is incoming or outgoing. First and second phase angle ranges are used when no short circuit fault is present; third and fourth ranges are used when a fault is present. The directions of power flow may be measured at different points in the network and the location of a fault determined as lying between two of these points.

A device for checking K phase current sensors for capturing measured values of K corresponding phase currents of an N-phase, electrical load, in particular an electrical machine, with N≥3 and with K<N, is provided. The device is configured to cause the N-phase load to be operated for a test period in a test operating mode in which the sum of the K phase currents, which are captured by the K corresponding phase current sensors, corresponds to a predefined value, in particular zero. Furthermore, the device is configured to determine K measured values from the K corresponding phase current sensors during the test period, and to check at least one of the K phase current sensors on the basis of the K measured values.

This application provides a measurement system and related method for measuring the phase of an IMD3 signal generated by a power amplifier. The method includes: performing a phase estimation operation, including multiple sub-operations, each sub-operation including: generating a first main signal, a second main signal, and a first adjustable signal, wherein the frequencies of the first main signal, the second main signal, and the first adjustable signal are f1, f2, and 2f1-f2, respectively; and correspondingly measuring a first power at the frequency of 2f1-f2; and estimating the phase of the IMD3 signal generated by the first main signal and the second main signal through the power amplifier at the frequency of 2f1-f2 based on the multiple first powers obtained from the multiple sub-operations; wherein the phase of the first adjustable signal in each sub-operation is different from that in the other sub-operations.

This application provides a grid-connected data acquisition circuit, device, and system, including: a first acquisition module, an amplitude detection module, a phase detection module, and a control module; one end of the first acquisition module is connected to the grid side, and the other end of the first acquisition module is connected to the control module; the first input terminal of the amplitude detection module is connected to the grid side, the second input terminal of the amplitude detection module is connected to the load side, the first output terminal of the amplitude detection module is connected to the control module, and the second output terminal of the amplitude detection module is connected to the control module; the first input terminal of the phase detection module is connected to the grid side, the second input terminal of the phase detection module is connected to the load side, and the first output terminal of the phase detection module is connected to the control module, and the second output terminal of the phase detection module is connected to the control module. This improves the accuracy of grid-connected data acquisition.

This invention discloses a power system disturbance source localization method based on energy functions. The method first collects response data of the power system after a disturbance, and then calculates the output energy of each generator unit and the potential energy of each load using energy functions. Next, a statistical model is used to perform preliminary analysis of the energy data to screen candidate disturbance sources. Finally, the labeled energy data is fed into a logistic regression classifier for training and online application, constructing a unified disturbance source localization model. This invention combines energy analysis with machine learning to achieve rapid, accurate, and automated localization of different types of disturbance sources, such as random load fluctuations and forced power oscillations of generators. It avoids the problems of misjudgment and insufficient timeliness caused by reliance on human experience in traditional methods, and is particularly suitable for complex power grid environments with a high proportion of renewable energy integration.

A method for calculating phase information of a local oscillator, LO, signal is provide. The LO signal is generated by a PLL from a reference clock and the LO signal is used in a RF frontend for down-converting a radio signal received by the RF frontend. The method comprises adding a harmonic derived from the reference clock to an input of the RF frontend and down-converting the harmonic using the LO signal; measuring a phase of the down-converted harmonic before a PLL event; measuring the phase of the down-converted harmonic after the PLL event; and calculating the phase information of the LO signal based on the phases measured before and after the PLL event.

The present application relates to the technical field of electrical measurement, and particularly relates to a measurement method and system of a mutual inductor value traceability device, an electronic device and a medium; the method comprises the following steps: firstly, obtaining initial monitoring information of a mutual inductor measurement loop contact point; calculating a drift current interval by using a thermal effect intensity evaluation method; applying a contact pressure adjustment amount to the measurement loop contact point; obtaining compensation monitoring information after the contact pressure adjustment amount is applied; finally, calculating an optimal working current range, a corresponding pressure value interval and a contact resistance stable range according to the compensation monitoring information and a rated measurement current accuracy technical index, so as to serve as an operation basis of the mutual inductor value traceability device in a subsequent measurement process. In this way, the technical problem that the measurement loop stability and the traceability accuracy are difficult to be improved simultaneously in the prior art is solved, and the measurement stability, accuracy and adaptability of the mutual inductor value traceability device are improved.

The application provides a method and system for nuclear phase of GIS substation system arrester, and relates to the technical field of electric power detection. The method comprises the following steps: acquiring voltage signals of multiple low-voltage lines; converting the voltage signals into low-voltage signals through an arrester and a bus; performing digital signal processing on the low-voltage signals through a transmitter; performing filtering processing on the low-voltage signals after digital signal processing through a low-pass filter to obtain filtered signals; calculating phase differences of the filtered signals through a zero-crossing detection algorithm; performing consistency determination on phases of each line according to the phase differences; and transmitting each filtered signal to a monitoring center through a GC433 wireless module. The method solves the nuclear phase problem caused by the closed structure of the GIS substation system by acquiring signals through the grounding point of the arrester, realizes the live nuclear phase, and does not need to power off and disassemble the cable terminal.

The application provides a method for coexistence of ferroelectric and antiferroelectric states in atomic force microscope detection of a multi-state memory, and is suitable for the technical field of characterization of micro / nano scale functional materials. The method comprises: obtaining an amplitude signal and a phase signal for a functional layer with coexistence of ferroelectric and antiferroelectric states; the amplitude signal and the phase signal are collected in the process that an atomic force microscope applies a bias scanning signal to a predetermined region of the functional layer; determining a relationship curve of amplitude and voltage based on the amplitude signal and the bias scanning signal; determining a relationship curve of phase and voltage based on the phase signal and the bias scanning signal; and determining the coexistence relationship of the ferroelectric state and the antiferroelectric state in the multi-state memory to be measured based on the relationship curve of amplitude and voltage and the relationship curve of phase and voltage. The embodiment of the application can deeply analyze the characterization method of the coexistence relationship of the local ferroelectric state and the antiferroelectric state, and provides a key characterization tool for material design, performance optimization and failure analysis of the multi-state memory.

To provide a battery monitoring device, a method for wirelessly transmitting battery-related information, and a program that can suppress the number of wireless transmissions of battery-related information.SOLUTION: A battery monitoring device 40 includes a plurality of monitoring units 44 that acquire battery-related information including at least information indicating the status of a battery, and a wireless communication unit 46. The wireless communication unit 46 wirelessly transmits the battery-related information acquired by the plurality of monitoring units 44 to a control device 50.SELECTED DRAWING: Figure 5