103 results about "Transient waves" patented technology

A system and a method is provided for the detection and capture, and in particular for an ultra high speed detection and capture, of transients in input voltages by an intelligent electronic device. The system and method detects transients for input voltages in either phase to phase or phase to neutral measurements and permits a user to set threshold levels for detecting transients in input voltages. In an embodiment, the system and method further provides a field programmable gate array as a controller for managing transient detection. The field programmable gate array includes a state machine for determining the state of the sampled signal with respect to a threshold level at a specified waveform sample period.

The invention discloses a hydraulic transmission-based method and a hydraulic transmission-based device for storing energy and realizing stabilized voltage and constant frequency in wave power generation. In the device, a floating pendulum is connected with a hydraulic cylinder, high pressure oil outputted by a non-rod cavity of the hydraulic cylinder enters a high pressure energy storing device and an oil inlet of a variable motor through a control integrated valve and through a high pressure oil tube, low pressure oil outputted by an oil outlet of the variable motor enters a low pressure big-capacity energy storing device and returns to the rod cavity of the hydraulic cylinder through the control integrated valve, the main shaft of the variable motor is connected with a permanent magnet synchronous generator, and the permanent magnet synchronous generator is connected to a rectifying module and a direct-current electric energy charging-discharging control module and then connected to a stepless unload adjustable load and a storage battery. The high pressure energy storing device and the low pressure big-capacity energy storing device realize the energy storage by absorbing the fluctuation, caused by the change of transient waves, of pressure and flow rate. A controller realizes the pressure stabilization constant frequency by the stepless unload adjustable load and the displacement of the hydraulic motor respectively. The device has the advantage of making the wave power generating device output more smoothly, more free from influence of the wave impact and have higher efficiency.

The multiple-path on-line transient waveform over-voltage detecting device for electric power system consists of high voltage divider, signal processing unit, industrial control computer and application software. The present invention leads in the voltage signals from different detection points in high voltage buses of different phases, the voltage signals are divided in the high voltage divider and processed in the signal processing unit, the processed voltage signals are fed to corresponding voltage signal inputs while the trigger signal the signal processing unit generates is fed to the trigger signal input of the acquisition unit communicating via PCI bus with the industrial control computer. When over-voltage is detected, the signal processing unit will send trigger signal informing the acquisition unit. The application software in the industrial control computer performs the program control of the whole detection process.

The invention discloses a supercapacitor charging circuit. The supercapacitor charging circuit comprises a reference voltage circuit, a voltage sampling circuit, a subtracter circuit and a switching tube module; a current transformer charges a supercapacitor through the switching tube module; the voltage sampling circuit samples voltage output by the current transformer and inputs the voltage into the subtracter circuit; the subtracter circuit subtracts a reference voltage signal of the reference voltage circuit from a sampling signal to produce a control signal to control work of the switching tube module, so that charging of the supercapacitor is controlled. The invention further discloses a charging method of the supercapacitor charging circuit. The method comprises the following steps: sampling the voltage of the current transformer; judging whether the supercapacitor is needed to be charged according to the voltage sampling value of the current transformer, the voltage sampling value at the supercapacitor end, a first voltage reference value and a second voltage reference value. The invention further discloses a transient wave recording type fault indicator adopting the charging circuit and the charging method. Non-polarized charging of the supercapacitor is realized, charging current is controlled according to the loading capacity of the current transformer, and the charging efficiency is quite high.

The invention relates to a transient wave-recording playback system of a series capacitor compensation device or a fault current limiter device. The system comprises a transient wave-recording playback card and a transient wave-recording playback managing machine. The transient wave-recording playback card comprises a digital signal processor (DSP), an embedded processor, a communication interface and a wave-recording Ethernet. The DSP and the embedded processor are connected through the communication interface. The embedded processor is connected in the wave-recording Ethernet. An embedded operation system is adopted in the transient wave-recording playback card. The transient wave-recording playback managing machine comprises a transient wave-recording managing machine of a spacing layer and a transient wave-recording managing machine of a station control layer. The transient wave-recording managing machine of the spacing layer and the transient wave-recording managing machine of the station control layer are connected with the wave-recording Ethernet respectively. The system disclosed by the invention has a playback function, a strong communication function and a strong distributive wave-recording and storing function and is in conformity with the implement requirements of the modern digital transformer station. The system can be also used for other flexible alternating-current power transmission devices.

The invention relates to the technical field of power supply line fault detection, in particular to a transient wave recording indicator. The transient wave recording indicator comprises an MSP430FR697xPM/RGC, a current and electric field collection unit and an external power taking and internal power supply unit, wherein the current and electric field acquisition unit comprises an electronic current collector, and a rectifier bridge is connected with an overhead line through a high-magnetic conductivity CT power taking sensor. The current and electric field collection unit has a strong online power taking ability, and normal work in the case of power taking current of 5A can be realized; due to the external power taking and internal power supply unit, +/-1% high-precision measurement current can be realized; three-phase synchronous timing precision can reach +/- 50 mus; accurate positioning of grounding fault of a small-current grounding system, particularly, transient grounding fault, complex intermittent grounding fault and high-resistance grounding fault can be realized; backtracking inversion is carried out on a complex fault process through wave recording waveforms, and a strong basis is provided for fault analysis; and early warning is carried out in advance when the line is in an abnormal state.

The invention discloses a stray capacitance acquisition method of an IGBT dynamic parameter test platform. The stray capacitance related to the IGBT dynamic parameter test platform is analyzed and extracted; the current component of the stray capacitance in the turn-off process of the IGBT is calculated according to an equivalent circuit diagram containing the stray capacitance test circuit; according to the current component, a difference between an actually measured current and an ideal current in the IGBT turn-off transient process is obtained; an IGBT turn-off transient process is used toobtain an incidence relations between the difference, between the actually measured current and the ideal current and the stray capacitance as well as between the difference and the voltage change rate of the collector electrode of the IGBT; and thus, the stray capacitance of the IGBT dynamic parameter test platform is calculated according to the incidence relations. On the basis of the turn-off instant waveform of the IGBT, the transient voltage change rate and current change amount are used, the stray capacitance of the dynamical test platform is calculated by an actual measurement method, and bases are provided for accurately evaluating the dynamic performance of a device and providing reliable dynamic data.

The invention relates to an automatic detection system and a method for the compatibility anomaly of a display. The system comprises an industrial PC, a photoelectric signal acquisition unit, a flicker signal processing unit, a Chroma signal source and a burning plate. The burning process of the display is completed through the on-line system programming process, and a related display control instruction is defined in the form of an array. After that, the software control for the OSD menu of the display is realized based on the DDC/CI protocol. Meanwhile, the "handshake" mechanism is added to ensure the reliability of control signals. At the same time, relevant test cases and the test timing are imported in the form of independent text files and excel files. Optical signals are acquired by a photoelectric sensor. The acquired signals are converted through the analog-to-digital conversion process and then a transient waveform is obtained. Furthermore, the transient waveform is subjected to the Fourier transform treatment to be converted into a power spectrum and the power spectrum is subjected to the human visual-sensitive weighted matching treatment. Finally, through the inverse Fourier transform treatment, the flicker degree is calculated. The system is high in degree of flexibility, low in cost, and high in efficiency. The test pressure of the test personnel can be reduced to a greater degree.

The invention provides a wind power generator running fault new type finding method based on transient state recording data. The method comprises the following steps that a multi-side feature vector of side data in transient wave data is constructed; a centroid matrix of the multi-side feature vector is constructed according to rows, and the centroid matrix is averaged according to columns to obtain a super centroid vector; a confidence matrix is initialized; based on K-means, the side surface data is clustered to obtain a clustering result; and a new fault type is judged according to the clustering result. According to the wind power generator running fault new type finding method based on the transient state recording data, the high-quality fault class can be accurately recognized with high performance and higher type quality, and reference implementation for constructing an automatic fault early warning and fault removal system is provided.

The invention relates to a transformer winding deformation online monitoring method and device based on a transient traveling wave. The method comprises the following steps of installing traveling wave measuring sensors on the high voltage side casing pipe and the low voltage side casing pipe of a transformer, and monitoring and collecting the transient traveling wave signals of the input and output ends of a transformer winding in real time; when the transformer winding is normal, identifying and classifying the transient wave signals of the input end, and carrying out wavelet packet decomposition characteristic extraction on the response signal of the output end so as to establish a big data sample library; according to a current real-time measured transient traveling wave signal identification result, calling a response sample under the effect of the same type of transient signals in the sample library to compare with a current response, and calculating a correlation coefficient; and using a correlation coefficient threshold to judge the deformation of the winding. In the invention, transformer winding deformation can be monitored in an online mode, anti-interference performanceis good and accuracy is high.

The invention relates to a smoothing reactor broadband electromagnetic transient analysis model based on transmission line structures, in particular to a smoothing reactor broadband electromagnetic transient analysis equivalent circuit based on transmission line structures which belongs to the field of electromagnetic transient broadband models for power systems. n like smoothing reactor unit length broadband equivalent circuits are sequentially connected in series to form the equivalent circuit provided by the invention, so that a plurality of distributed transmission line structures are formed, and the distributed transmission line structures are utilized to simulate the transmission of the transient wave process in a smoothing reactor. The smoothing reactor broadband electromagnetic transient analysis equivalent circuit takes the changes of parasitic capacitance, stray inductance and winding resistance of distribution parameters of the smoothing reactor under the high-frequency skin effect and the proximity effect into consideration, and can accurately simulate the electromagnetic transient of the smoothing reactor under power frequency characteristics and disturbance characteristics.

The invention discloses a phase sequence adaptive method based on a transient wave recording type fault indicator, and particularly relates to the related field of power equipment, the transient waverecording type fault indicator comprises a collection unit and three acquisition units, and the collection unit needs to network the three acquisition units to perform accurate clock synchronization;wherein obvious phases and current directions need to be marked on the acquisition units, then the acquisition units are installed on A, B and C phases of an overhead line; and after wave recording isstarted, the three-phase acquisition units can synchronously acquire current electric field data. According to the method, current electric field data of each phase are respectively processed and transformed through acquired current electric field data, corresponding polarity and phase sequence are obtained, and then self-calibration and self-adaptation of an acquisition unit are carried out. According to the method, adverse effects caused by an unknown field installation environment can be overcome, a good effect can be achieved in practical application; therefore, the method has important significance in promoting development of an intelligent power grid and ensuring reliable operation of the power grid.

The invention relates to the field of fault type judgment, and particularly relates to a fault type judgment system and method based on transient recording type fault indicators. The fault indicatorsperform wave recording and fault diagnosis on the current state of a line in real time; the attribute information and related action information are sent to a data acquisition communication terminal through wireless radio frequency communication; the data acquisition communication terminal transmits the fault information to a background master station system through 4G communication; and after thebackground master station system receives the fault action information of the multiple groups of transient wave recording fault indicators through the Ethernet, a fault type is finally generated anddisplayed in a web system, and the fault type is pushed to a mobile phone of a maintenance engineer or convenient maintenance equipment to assist the maintenance engineer in determining fault positioning. According to the judgment system and method, a user can quickly locate a fault occurrence point and judge the type to solve the problem, and a new intelligent distribution line monitoring systemcapable of replacing manual monitoring is formed.

The invention discloses an IGBT dynamic parameter test circuit stray capacitance extraction method and system. The method comprises the following steps: measuring an emitter actual measurement voltageand a collector actual measurement current of an IGBT device in a transient switching-on process to obtain a voltage change curve of the emitter actual measurement voltage in the transient switching-on process and a current change curve of the collector actual measurement current in the transient switching-on process; calculating a voltage difference between an end moment and a start moment of the emitter actual measurement voltage in the transient switching-on process by using the voltage change curve; calculating an electric quantity difference between an ideal electric quantity of a collector and an actual measurement electric quantity in the transient switching-on process by utilizing the current change curve; and acquiring the stray capacitance of an IGBT dynamic parameter test circuit by dividing the voltage difference by the electric quantity difference. The stray capacitance of the dynamic test platform is calculated through an actual measurement method based on a switching-ontransient waveform of the IGBT device, accuracy of a measurement result of the dynamic test equipment can be effectively evaluated, and a basis is provided for formulating the standard of the stray capacitance of the equipment.

The invention discloses a power distribution network fault positioning method and device. The method comprises the steps of receiving a fault recording file generated by a fault indicator in responseto a power distribution network fault; analyzing to obtain zero-sequence current waveform data; determining a fault occurrence moment; determining a line topological structure according to a pre-constructed power distribution network model; according to the number of the branch lines connected with a bus and by comparing the zero-sequence current waveform similarity of the fault indicators on thedifferent branch lines connected with the bus, pre-judging the branch lines where the fault is located; for the branch line where each pre-judged fault is located, judging whether the fault exists ornot or judging the position of the fault by comparing the similarity of the zero-sequence current waveforms of the adjacent fault indicators on the branch line. According to the invention, fault positioning discrimination is carried out based on the waveform file of the transient wave recording type fault indicator in combination with the line topology, the fault positioning efficiency and reliability can be improved, and the requirement for the time synchronization precision of the fault indicators is not high.

The invention relates to a method for acquiring a zero-sequence current transient starting point during a single-phase earth fault of a power distribution network. The method comprises the following steps of: alternating-current sampling is made on an outgoing line end and each branch line of a transformer substation at the same sampling frequency by adopting a PMU and a transient recording type fault indicator; when a single-phase earth fault occurs, the PMU and the transient wave recording type fault indicator upload a fault wave recording waveform to a main station; the main station analyzes the bus zero-sequence voltage waveform uploaded by the PMU and finds the position of a zero-sequence voltage sudden change point through a periodic amplitude comparison method; and the transient starting point position of the zero-sequence current of the transient recording type fault indicator is acquired through time conversion. The acquisition of the transient starting point of the zero-sequence current signal of the high-frequency unstable transient recording type fault indicator is converted into the acquisition of the abrupt change point of the zero-sequence voltage signal of the low-frequency stable PMU, so that the error probability is reduced, and the acquisition accuracy is improved.

An installation phase sequence self-identification method for transient wave recording fault indicators comprises: the transient wave recording fault indicators and a bus zero sequence voltage starting device under the same bus periodically reading time service, and all the transient wave recording fault indicators achieving synchronization of system time and sampling point positions; the transient recording fault indicator circularly storing current and electric field data of each phase; the bus zero-sequence voltage starting device starting triggering wave recording, and all transient wave recording fault indicators under the same bus acquiring current and electric field data; calculating respective current initial phases; taking the current initial phase of the ABC three-phase transientrecording indicator at the lower outlet of the bus as a reference, and respectively comparing the phase differences of the currents of all the other indicators; and determining the phase and the current direction coefficient of the transient recording indicator according to the phase difference. The method is simple to implement and high in efficiency, and is automatically implemented in the whole process through the transient wave recording fault indicator and the main station system without human intervention.

The invention discloses a time synchronization method for real-time dynamic tracking, belongs to the field of computer application, and relates to a synchronization method of sampling data, in particular to a time synchronization method for real-time dynamic tracking between master equipment and slave equipment, which is applied to a transient wave recording type fault indicator. The time synchronization master station broadcasts a time synchronization command every T milliseconds, the time synchronization command comprises a current timestamp, the slave equipment receives the time synchronization command, the difference between the current timestamp and the slave equipment is calculated according to the interval between the continuously received timestamps and the local time interval, andthe count value in the local timer is adjusted according to the difference, so that the purpose of real-time dynamic tracking time synchronization is achieved. By adopting the scheme provided by theinvention, the timestamp in the received time synchronization command is used as a reference, the oscillation count of the crystal oscillator within a certain period of time is adjusted, the synchronization of the local clock and the host is finely adjusted, the clock synchronization of a plurality of slave devices is realized, and the time difference between the slave devices is within +/-2 microseconds.

The invention discloses a distribution network line fault detection method based on an integrated distribution box and a high-voltage sensor, and the method comprises the steps: 1, the sensors are installed on an A phase, a B phase and a C phase of a corresponding line, and the collected data are transmitted to a collection module through wireless transmission; 2, a collection module is responsible for operating three phases of sensor data, judging the fault type and the fault point section of an actual line on site, and transmitting a final calculation result or line parameters to the comprehensive distribution box in real time through wireless transmission; 3, the comprehensive distribution box wirelessly transmits a calculation result or line parameters to a main station. The technicalproblems that in the prior art, a fault positioning system based on a fault indicator, especially a transient wave recording type fault indicator, is widely applied, but a fault indicator product cannot achieve on-site accurate judgment of a single-phase grounding fault, and the grounding fault detection accuracy is low are solved.

The invention relates to a dynamic recording device and method for a power system. The device comprises a dynamic recording unit and a managing unit, wherein the dynamic recording unit comprises a message processing module, a transient wave recording module, a continuous wave recording module, a data forwarding module, a 61850 communication module, a time management module, an I/O control module and a daemon module. By constructing a first data bus and a second data bus which are used for data transmission in the dynamic recording unit and between the dynamic recording unit and the managing unit respectively, data in the device can be effectively organized and distributed, high-speed and stable transmission of the data in the device is achieved, and the properties of the device are improved.

The invention discloses a power distribution network transient wave fault tracking method and apparatus based on cloud analysis and identification. The apparatus includes a data acquisition unit installed on a 3-35 kV middle-low voltage power distribution line, the acquisition unit is in data exchange with a monitoring host via a zigbee wireless network, the monitoring host uploads the processed data to a cloud server via a wireless private network, and the cloud server analyzes the data and sends the analyzed data to each terminal device. The power distribution network transient wave fault tracking method and apparatus have the advantages of being capable of rapidly and accurately performing online detection of various power distribution line faults, performing real-time effective monitoring of the power distribution lines, and finding the defects before the failure according to the running character states of the lines.

The invention discloses a wrong start filtering method for a transient wave-recording fault indicator. The method comprises the following steps: firstly, distinguishing a suspected short-circuit failure and a suspected grounding failure occurring at present according to data acquired by each phase of acquisition unit; and further judging whether the failure is a false report or not according to the judgement result. In the method, the failure indicator firstly judges whether wrong start is performed or not on an aggregation unit, thereby avoiding further processing of the wrong start and the resulting power consumption waste, and avoiding the communication interference with a main station. The method has important significance for the application, operation and maintenance as well as healthy development of power distribution automation.

An IGBT residual life prediction and state evaluation realization method comprises the following steps: collecting a turn-off transient curve of collector-emitter voltage Vce of an IGBT module through an aging test platform, extracting features from the turn-off transient curve, filtering the features, carrying out curve trend prediction through a deep auto-regressive recurrent neural network, determining that an IGBT fails when the predicted curve exceeds a threshold value, and obtaining the aging degree and the health state of the IGBT module correspondingly. According to the method, the transient waveform characteristics of the IGBT at the switching moment are used as the IGBT aging index.

The invention discloses a line test system and a test tool based on a transient wave recording type fault indicator, comprising the transient wave recording type fault indicator, a collecting unit, amonitoring platform and a fixing seat, wherein the transient wave recording type fault indicator is connected to the collecting unit by wireless communication, the collecting unit is linearly connected with a power module and an antenna, the collecting unit is connected to the monitoring platform by wireless communication, the monitoring platform is linearly connected with a data storage module, aline fault analysis module, a wave mode data comparison module and an alarm module, a lower fixing groove is formed in an upper end of the fixing seat, the lower fixing groove is connected and provided with an upper fixing groove by a bolt button, the line test system and the test tool disclosed by the invention upload data to the monitoring platform through the wireless communication, and monitor the line fault information and operating conditions of a power distribution network, and the test tool can fix and clamp the transient wave recording type fault indicator, so that the transient waverecording type fault indicator can be conveniently detected.