System and method for measuring transformation ratio polarity of electronic transformer

Abstract

The invention provides an electronic transformer transformation ratio polarity measurement system and method, and belongs to the technical field of electronic transformer measurement. Comprising a signal source unit, a display control unit and a secondary measurement unit, the signal source unit is connected with the primary end of the electronic transformer and is used for outputting primary high voltage and primary large current to the electronic transformer; a multi-channel parallel processing framework for correcting primary high voltage and primary large current is arranged in the signal source unit; the secondary measurement unit is connected with the secondary end of the electronic transformer and is used for measuring the voltage and the current of the secondary end of the electronic transformer; and the display control unit synchronously controls the output of the signal source unit and the measurement state of the secondary measurement unit based on a high-precision synchronous trigger mechanism, and synchronously acquires data in real time for analysis. According to the invention, the accuracy and safety of the measurement of the transformation ratio polarity of the electronic transformer can be ensured on the basis of avoiding multiple times of voltage and current boosting.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic transformer measurement, and particularly relates to a system and method for measuring the transformation ratio and polarity of an electronic transformer. Background Technique

[0002] The statements in this part only provide background technical information related to the present invention, and do not necessarily constitute prior art.

[0003] With the research and development of intelligent electrical equipment, electronic transformers have been widely used in intelligent substations. Compared with traditional transformers, electronic transformers occupy less space, have simple insulation, and have no magnetic saturation phenomenon. At the same time, they can replace traditional analog power quantity acquisition with digital signals, so they have the advantages of analog voltage output or digital output, large measurement range, and high precision. However, the measurement error of electronic transformers is easily affected by on-site installation, so on-site error testing and error adjustment must be carried out after installation to ensure its stability and reliability.

[0004] However, the existing related technologies for testing electronic transformers such as measuring the transformation ratio and polarity generally have some technical problems, for example:

[0005] (1) Electronic transformers usually have high precision. Therefore, in the transformation ratio test, high requirements are placed on the precision of the measuring device. To avoid introducing additional errors, when judging the polarity, it is necessary to design according to the working principle and internal structure of the electronic transformer. Therefore, the analysis of electronic transformers is more complex than that of traditional transformers. In addition, in a substation, a group of electronic transformers are equipped with multiple merging units. If the overall error detection method is used, not only does it require continuous boosting and current increasing of voltage and current transformers multiple times, but also multiple tests are required to obtain accurate test results, resulting in a large amount of detection work and high detection costs.

[0006] (2) Inadequate wiring analysis: When analyzing by the existing methods, more special positions are often ignored, such as positions hidden inside the equipment or difficult to reach, resulting in inadequate wiring analysis.

[0007] (3) There are safety problems: When actually operating, the signal source unit needs to release high voltage and large current, and the existing technologies do not have relevant safety protection designs in this regard, resulting in low safety. Summary of the Invention

[0008] To overcome the above-mentioned deficiencies of the prior art, the present invention provides a system and method for measuring the transformation ratio and polarity of an electronic transformer, which can ensure the accuracy and safety of measuring the transformation ratio and polarity of an electronic transformer on the basis of avoiding multiple boosting and current increasing.

[0009] To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:

[0010] In the first aspect of the present invention, an electronic current transformer ratio and polarity measurement system is provided.

[0011] An electronic current transformer ratio and polarity measurement system includes: a signal source unit, a display control unit, and a secondary measurement unit;

[0012] The signal source unit is connected to the primary end of the electronic current transformer for outputting a primary high voltage and a primary large current to the electronic current transformer; wherein, a multi-channel parallel processing architecture for correcting the primary high voltage and the primary large current is provided in the signal source unit;

[0013] The secondary measurement unit is connected to the secondary end of the electronic current transformer for measuring the voltage and current at the secondary end of the electronic current transformer;

[0014] Based on a high-precision synchronous triggering mechanism, the display control unit synchronously controls the output of the signal source unit and the measurement state of the secondary measurement unit, and synchronously obtains and analyzes data in real time to achieve the ratio and polarity measurement of the electronic current transformer.

[0015] Further, the signal source unit includes a first processing module, a second processing module, a first communication module, a second communication module, a switching power supply module, a measurement component, and a voltage and current output component.

[0016] Further, a signal conditioning circuit is provided in the measurement component, and a parallel processing module is integrated in the first processing module; the signal conditioning circuit and the parallel processing module are connected through a multi-channel ADC module. Among them, the signal conditioning circuit, the parallel processing module, and the multi-channel ADC module together constitute a multi-channel parallel processing architecture.

[0017] Further, the measurement component includes a primary three-phase voltage measurement module and a primary three-phase current measurement module; the voltage and current output component includes an inverter switching output module, a boosting module, a primary three-phase voltage output module, a current boosting module, and a primary three-phase current output module.

[0018] Further, the secondary measurement unit includes a voltage and current acquisition component, a third processing module, a third channel module, and a fourth channel module.

[0019] Further, the voltage and current acquisition component includes a secondary three-phase voltage acquisition module and a secondary three-phase current acquisition module.

[0020] Further, the third channel module in the secondary measurement unit performs signal synchronous transmission with the first communication module in the signal source unit through a clock synchronous triggering mechanism.

[0021] Further, the display control unit includes a fifth communication module, a control module, and a display module.

[0022] Further, the fifth communication module in the display control unit performs signal synchronous transmission with the second communication module in the signal source unit and the fourth channel module in the secondary measurement unit respectively through a synchronous triggering mechanism.

[0023] The second aspect of the present invention provides a method for measuring the transformation ratio and polarity of an electronic current transformer.

[0024] A method for measuring the transformation ratio and polarity of an electronic current transformer, which is used for the electronic current transformer transformation ratio and polarity measurement system described in the first aspect, includes:

[0025] Obtain the fundamental wave quantities of the output and measured voltage and current amplitudes, and perform phase compensation; construct a multi-dimensional feature space including harmonic distortion rate, phase offset, and transient response time, and input it into a quantum convolutional neural network for multi-dimensional non-linear fitting to achieve transformation ratio calculation;

[0026] Use the S transform to extract the time-frequency ridge line of the excitation-response signal, and combine it with the cross-high-order cumulant phase analysis; construct a polarity discrimination matrix and dynamic monitoring for intelligent polarity diagnosis;

[0027] Based on the correlation matrix analysis method, establish a wiring state characteristic matrix according to the single-phase wiring mode, three-phase star wiring mode, and three-phase delta wiring mode of the electronic current transformer wiring system, and automatically identify and locate the incorrect wiring to achieve automatic wiring discrimination;

[0028] Through joint analysis, perform anomaly detection and anomaly alarm prompts;

[0029] Structurally process the measurement results and analysis results, automatically fill in the key parameters, and automatically generate a templated report for export based on the transformation ratio, polarity, and wiring determination results.

[0030] The above one or more technical solutions have the following beneficial effects:

[0031] (1) The present invention uses the signal source unit to output a primary high voltage and a primary large current to the electronic current transformer; among them, a multi-channel parallel processing architecture for correcting the primary high voltage and the primary large current is provided in the signal source unit. Each module in the signal source unit cooperates with the provided parallel processing architecture, and there is no need to continuously boost the voltage and current transformers multiple times; at the same time, with the support of the multi-channel parallel processing architecture, only one test is required to complete accurate testing, which can significantly reduce the workload and testing cost of detection.

[0032] (2) Based on the correlation matrix analysis method, the present invention establishes a wiring state characteristic matrix according to the single-phase wiring mode, three-phase star wiring mode, and three-phase delta wiring mode of the electronic current transformer wiring system, and automatically identifies and locates incorrect wiring to achieve automatic wiring discrimination. Therefore, even for those special parts hidden inside the equipment or in difficult-to-reach positions, the present invention will not overlook them and can analyze the wiring state more accurately.

[0033] (3) In the present invention, the display control unit is used for parameter setting, synchronously controlling the output of the signal source unit, and collecting and measuring by the secondary measurement unit; at the same time, the display control unit has the functions of setting overload protection and emergency stop according to the high voltage and large current ranges output by the signal source unit to avoid exceeding the safety range of the equipment. Therefore, the present invention can dynamically adjust the output parameters according to the real-time feedback of the measurement, the transformation ratio, and the frequency response characteristics of the electronic current transformer to be measured, thereby ensuring the accuracy and safety of the test.

[0034] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0036] Figure 1 It is a structural diagram of a system for measuring the transformation ratio and polarity of an electronic current transformer in Embodiment 1 of the present invention.

[0037] Figure 2 It is a structural diagram of a multi-channel parallel processing architecture in Embodiment 1 of the present invention.

[0038] Figure 3 It is a flowchart of constructing a clock synchronization trigger mechanism in Embodiment 2 of the present invention.

[0039] Figure 4 It is a flowchart of a method for measuring the transformation ratio and polarity of an electronic current transformer in Embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0042] Without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0043] Embodiment 1

[0044] This embodiment discloses an electronic current transformer ratio and polarity measurement system.

[0045] As Figure 1 shown, an electronic current transformer ratio and polarity measurement system includes: a signal source unit, a display control unit, and a secondary measurement unit;

[0046] The signal source unit is connected to the primary end of the electronic current transformer and is used to output a primary high voltage and a primary large current to the electronic current transformer; wherein, a multi-channel parallel processing architecture for correcting the primary high voltage and the primary large current is arranged in the signal source unit;

[0047] The secondary measurement unit is connected to the secondary end of the electronic current transformer and is used to measure the voltage and current at the secondary end of the electronic current transformer;

[0048] Based on a high-precision synchronous triggering mechanism, the display control unit synchronously controls the output of the signal source unit and the measurement state of the secondary measurement unit, and synchronously obtains and analyzes data in real time to realize the ratio and polarity measurement of the electronic current transformer.

[0049] Based on the above design, the present invention can ensure the accuracy and safety of the ratio and polarity measurement of the electronic current transformer on the basis of avoiding multiple step-up of voltage and step-up of current. For the convenience of understanding the technical solution of the present invention, the following further explains and illustrates the specific implementation manners in the technical solution of the present invention.

[0050] An electronic current transformer ratio and polarity measurement system includes a signal source unit, a display control unit, and a secondary measurement unit.

[0051] As Figure 1 shown, the signal source unit is used to output an accurate primary high voltage or a primary large current and inject it into the primary end of the electronic current transformer. Specifically, the signal source unit includes a first processing module, a second processing module, a first communication module, a second communication module, a switching power supply module, a measurement component, and a voltage and current output component.

[0052] To ensure the accuracy of data measurement, the present invention provides a clock synchronization trigger mechanism between the signal source unit and the secondary measurement unit for synchronous transmission. Of course, synchronous transmission is one aspect. In addition, the present invention also designs multi-channel synchronous acquisition measurement for relevant measurement devices to achieve synchronous acquisition of multi-channel data and thus improve the test accuracy. Specifically: A signal conditioning circuit is provided in the measurement component. At the same time, a parallel processing module with a multi-channel parallel processing architecture is integrated in the first processing module; the signal conditioning circuit and the parallel processing module are connected through a multi-channel ADC module. Among them, the signal conditioning circuit, the parallel processing module, and the multi-channel ADC module together constitute a multi-channel parallel processing architecture as shown in Figure 2 shown. In the actual implementation process, the signal conditioning circuit is used to isolate, filter, and amplify the monitored voltage signal and current signal, and then input them into the multi-channel ADC module for synchronous sampling. After synchronous sampling, the ADC data is directly transmitted to the parallel processing module through the DMA channel for parallel processing.

[0053] As Figure 1 shown, the measurement component includes a primary three-phase voltage measurement module and a primary three-phase current measurement module. The voltage and current output component includes an inverter switching output module, a boost module, a primary three-phase voltage output module, a current boost module, and a primary three-phase current output module.

[0054] Furthermore, after the signal source unit outputs high voltage and high current, real-time monitoring of the multi-channel output values is carried out. Specifically: ① For the voltage multi-channel: The signal conditioning circuit uses a precision resistor voltage divider and an isolation type voltage transformer network to isolate and divide the high voltage, and then through stacking filtering and amplification, it is input into the multi-channel ADC module for synchronous sampling; ② For the current multi-channel: The signal conditioning circuit uses a current transformer and a precision operational amplifier conversion network to convert the high current into a current-voltage conversion, and then through filtering and amplification, it is input into the multi-channel ADC module for synchronous sampling. Finally, according to the magnitude of the monitored current value and the magnitude of the output set value, dynamic correction is performed to implement a closed-loop correction system.

[0055] As Figure 1 shown, the secondary measurement unit is used to measure the voltage and current at the secondary end of the electronic current transformer. Specifically, the secondary measurement unit includes a voltage and current acquisition component, a third processing module, a third channel module, and a fourth channel module. Among them, the voltage and current acquisition component includes a secondary three-phase voltage acquisition module and a secondary three-phase current acquisition module. At the same time, the third channel module in the secondary measurement unit performs signal synchronous transmission with the first communication module in the signal source unit through the clock synchronization trigger mechanism.

[0056] Furthermore, the secondary measurement unit performs multi-channel sampling measurements on the secondary voltage and secondary current signals converted by the electronic current transformer. Specifically: ① Voltage channel: The signal conditioning circuit performs operational amplifier sampling, filtering, and amplification processing on the monitored secondary voltage signal and inputs it to the multi-channel ADC module for synchronous sampling; ② Current channel: The signal conditioning circuit performs operational amplifier sampling, filtering, and amplification processing on the monitored secondary current signal and inputs it to the multi-channel ADC module for synchronous sampling. As an optional embodiment, for the multi-channel ADC sampling module, an 8-channel, 16-bit AD7606 processing module can be selected to read the internal status register of the ADC and compensate for the offset between channels; the first processing module including a parallel processing module can select the minimum processing system of the STM32H7 series chip with dual-core Cortex-M7 to calculate the RMS value in real time; where the RMS value represents the root mean square value (effective value).

[0057] As Figure 1 shown, the display control unit is used for parameter setting, synchronously controlling the output of the signal source unit, and collecting and measuring by the secondary measurement unit, synchronously obtaining data in real time for analysis, realizing the discrimination of the transformation ratio, polarity, and wiring of the electronic current transformer; and automatically exporting a report of the measurement results. Specifically, the display control unit includes a fifth communication module, a control module, and a display module.

[0058] When performing transformation ratio testing, polarity testing, and wiring testing through the display control unit, corresponding parameters are automatically selected, including: ① Transformation ratio testing: Set the output of the primary signal with different amplitudes to perform the transformation ratio testing of the electronic current transformer; ② Polarity testing: Set a specific phase relationship input according to requirements for measurement; ③ Wiring testing: Automatically perform wiring discrimination based on the relationship between the input parameters of the transformation ratio and polarity testing and the relationship after test analysis. In the actual implementation process, the display control unit can set overload protection and emergency stop functions according to the high voltage and large current ranges output by the signal source unit to avoid exceeding the safety range of the device, and dynamically adjust the output parameters according to the real-time feedback of the measurement and the transformation ratio and frequency response characteristics of the electronic current transformer to be measured to ensure the accuracy and safety of the test.

[0059] Furthermore, the fifth communication module in the display control unit performs signal synchronous transmission with the second communication module in the signal source unit and the fourth channel module in the secondary measurement unit through a synchronous trigger mechanism.

[0060] Furthermore, the data processing relationships among the signal source unit, the secondary measurement unit, and the display control unit are as follows: The first processing module controls the second processing module to start signal output, and the second processing module outputs a modulation signal to the inverter switching output module; the synchronization first processing module controls the start of the switching power supply module, and the switching power supply module inputs the voltage to be inverted into the inverter switching output module; the inverter output switching module inverts the voltage input through the switching power supply module and then selects to output to the boost module for primary three-phase voltage output, or selects to output to the current boost module for primary three-phase current output.

[0061] Among them, the boost module includes three-way boosting, which are respectively connected to the primary three-phase voltage output module for AC voltage output; the current boost module includes three-way current boosting, which are respectively connected to the primary three-phase current output module for AC current output.

[0062] After the primary three-phase voltage output module and the primary three-phase current output module output voltage and current, they are connected to the electronic current transformer. Synchronously, the primary three-phase voltage measurement module is used to monitor the magnitude of the output voltage, and the primary three-phase current measurement module is used to monitor the magnitude of the output current. A multi-channel parallel processing architecture is constructed for the primary three-phase voltage measurement and the primary three-phase current measurement, that is, the primary three-phase voltage measurement module and the primary three-phase current measurement module include a signal conditioning circuit of the multi-channel parallel processing architecture, and the first processing module includes a parallel processing module of the multi-channel parallel processing architecture; the voltage signal monitored by the primary three-phase voltage measurement module is processed through the signal conditioning circuit, input into the multi-channel ADC module for synchronous sampling, and after synchronous sampling, the ADC data is directly transmitted to the parallel processing module through the DMA channel for parallel processing.

[0063] While controlling the second processing module to start signal output, the first processing module starts the second communication module, connects to the fifth communication module of the display control unit, and transmits the voltage and current data output by the signal source to the display control unit for display.

[0064] The secondary three-phase voltage acquisition module and the secondary three-phase current acquisition module of the secondary measurement unit access and measure the signals on the secondary side of the electronic current transformer, and through data processing by the third processing module, synchronously connect to the fifth communication module through the fourth communication module to display the measurement results.

[0065] Embodiment 2

[0066] This embodiment discloses a method for measuring the transformation ratio and polarity of an electronic current transformer.

[0067] As Figure 4 shown, a method for measuring the transformation ratio and polarity of an electronic current transformer includes:

[0068] Step S1: Obtain the fundamental wave quantities of the output and measured voltage and current amplitudes, and perform phase compensation; construct a multi-dimensional feature space including harmonic distortion rate, phase offset, and transient response time, and input it into a quantum convolutional neural network for multi-dimensional non-linear fitting to achieve ratio calculation.

[0069] Obtain the fundamental wave quantities of the output and measured voltage and current amplitudes through digital signal processing by the display control unit, perform phase compensation, and adopt a dynamic error compensation model to achieve high-precision measurement over the full range; construct a multi-dimensional feature space including harmonic distortion rate, phase offset, and transient response time, input it into a quantum convolutional neural network, and perform multi-dimensional non-linear fitting to achieve ratio calculation.

[0070] Step S2: Use the S transform to extract the time-frequency ridge line of the excitation-response signal, and combine it with the cross-high-order cumulant phase analysis; construct a polarity discrimination matrix and dynamic monitoring for intelligent polarity diagnosis. That is, automatically identify the phase analysis of the high-order cumulant to achieve dynamic monitoring and determine whether the polarity is normal.

[0071] Step S3: Based on the correlation matrix analysis method, establish a wiring state feature matrix according to the single-phase wiring mode, three-phase star wiring mode, and three-phase delta wiring mode of the electronic current transformer wiring system, and automatically identify and locate incorrect wiring to achieve automatic wiring discrimination. Specifically:

[0072] Establish a feature matrix template of the standard wiring mode through the single-phase wiring mode, three-phase star wiring mode, and three-phase delta wiring mode;

[0073] Normalize the voltage and current data collected in real time to eliminate the influence of amplitude, retain the phase and symmetry characteristics, and generate a real-time feature matrix;

[0074] Compare the real-time feature matrix with the feature matrix template to determine the similarity;

[0075] Determine the error type according to the similarity and deviation.

[0076] Among them, the feature of the single-phase wiring mode is that only one phase has an effective signal, and the other phases are close to zero; the feature of the three-phase star wiring mode is that the amplitudes of the three phases are symmetrical and the neutral point current tends to zero; the feature of the three-phase delta wiring mode is that the phase difference between lines is 30° and there is no neutral point current.

[0077] Step S4: Through joint analysis, perform anomaly detection and anomaly alarm prompts;

[0078] Step S5: Structurally process the measurement results and analysis results, automatically fill in the key parameters, and automatically generate a templated report for export based on the ratio, polarity, and wiring determination results.

[0079] Furthermore, the parameter setting, synchronous control, and real-time synchronous acquisition of the display control unit mainly focus on constructing a high-precision synchronous triggering mechanism to improve the synchronous stability in complex electromagnetic environments, including constructing a clock synchronous triggering mechanism between the signal source unit and the secondary measurement unit and constructing a synchronous triggering mechanism between the display control unit, the signal source unit, and the secondary measurement unit.

[0080] (1) As Figure 3 shown, the specific steps for constructing a clock synchronous triggering mechanism between the signal source unit and the secondary measurement unit include:

[0081] Step A1: Construct a dual-redundancy clock source to provide synchronous clocks.

[0082] Use the Beidou satellite clock signal as the main reference clock source, and integrate an anti-jamming antenna to obtain the clock signal; an OCXO temperature-controlled crystal oscillator is built into the system unit as the local timekeeping source.

[0083] As an optional embodiment, the first communication module and the third communication module integrate a Beidou receiving module and a local crystal oscillator timekeeping module; the Beidou receiving module uses the received Beidou satellite clock signal as the main reference clock source; the local crystal oscillator timekeeping module uses an OCXO temperature-controlled crystal oscillator and aligns with the main reference clock source for clock taming.

[0084] Step A2: Construct a dynamic switching mechanism for synchronous communication.

[0085] The signal source unit and the secondary measurement unit adopt a master-slave dual mode, and can directly switch to the master mode to perform dual-mode satellite time synchronization respectively, or after one unit performs time synchronization in the master mode, other units follow the time-synchronized unit to achieve clock alignment; after the system unit is time-synchronized, tame the internal clock and start self-timekeeping; in an environment where dual-mode satellite clock signals cannot be detected, use an improved BGP routing algorithm to achieve dynamic switching from the main reference clock source to the local timekeeping source.

[0086] As an optional embodiment, the first communication module and the third communication module adopt a master-slave dual mode; both modules switch to the master mode to perform Beidou satellite time synchronization respectively; after one module switches to the master mode for time synchronization, the other module follows the time-synchronized module to achieve clock alignment; after time synchronization, tame the internal clock and start self-timekeeping; in an environment where dual-mode satellite clock signals cannot be detected, use an improved BGP routing algorithm to achieve dynamic switching from the main reference clock source to the local timekeeping source. It includes:

[0087] ① Obtain the accuracy, stability, and delay of the main clock source and the local timekeeping source, calculate the multi-attribute weights; evaluate the time drift rate in the local clock source hold mode; in the fast convergence mode, periodically send packets for detection to enhance the state detection of the clock source;

[0088] ②Form routing nodes with the master clock source as the first priority according to the clock quality, and the local holdover clock source as the second priority routing node; dynamically adjust the priority of clock source usage according to clock deviation and status;

[0089] ③Define the switching strategy: The priority of the master clock source is default highest. If the master clock source has three consecutive request timeouts, the time deviation exceeds the threshold of ±100 ns, and the path delay jitter exceeds 1 ms, trigger the switch to the local holdover source; the local holdover clock enters the hold mode. Before switching to the master clock source, pre-synchronize to the master clock source, and use time interpolation to calculate and compensate for the phase jump at the moment of switching; the master clock source and the local clock source run simultaneously in a weighted hybrid mode to prevent instantaneous clock interruption.

[0090] ④Construct an LSTM-Attention network to form a fault detection mechanism for fault early warning: Input the clock deviation and temperature characteristic quantities, extract the time series characteristics, calculate the time step weights of the characteristics, predict the transmitted offset, issue a fault early warning and promptly feedback it to the dynamic switching mechanism for transmission adjustment.

[0091] Step A3: Form a fault detection mechanism.

[0092] LSTM-Attention prediction, input clock deviation, temperature, output voltage, measured voltage, realize early warning of clock system faults, and correct transmission offsets.

[0093] (2) The specific construction of the synchronization trigger mechanism between the display control unit, the signal source unit, and the secondary measurement unit is as follows:

[0094] Step B1: After the signal source unit and the secondary measurement unit are time synchronized based on Beidou, the local clocks form a unified time reference. As an alternative embodiment, the IEEE 1588 PTP precision time protocol is adopted between the display control unit, the signal source unit, and the secondary measurement unit. Using the PPS second pulse, nanosecond-level synchronous triggering can be achieved for multiple signal source units and secondary measurement units at different positions, eliminating asynchronous errors.

[0095] Step B2: The signal source unit and the secondary measurement unit act as the master clock, and the display control unit acts as the slave clock. The master clock sends synchronization information to the slave clock, and the slave clock records the arrival time point after receiving the synchronization information;

[0096] Step B3: Measure the round-trip time between the master and slave clocks by delaying the request and response messages, determine the time delay and offset. The slave clock calculates the time error using the received timestamp and transmission delay, and adjusts its own analysis and comparison time according to this time error to ensure the synchronization of analysis and comparison.

[0097] As an alternative embodiment, after the signal source and the secondary measurement unit are time-synchronized based on Beidou, a unified time reference is formed by the local clock. The IEEE 1588 PTP precision time protocol is adopted between the display control unit, the signal source unit and the secondary measurement unit. By using the PPS second pulse, nanosecond-level synchronous triggering can be achieved for multiple signal source units and secondary measurement units at different positions, eliminating asynchronous errors. The signal source unit and the secondary measurement unit serve as the master clock, and the display control unit serves as the slave clock: the master clock sends synchronization information to the slave clock, and the slave clock records the arrival time point after receiving the synchronization information; the master clock sends accurate clock information to the slave clock, and the slave clock determines the reception time and calculates the single-phase delay; the slave clock sends the delay information to the master clock, and the master clock records the arrival time and replies to the slave clock; the slave clock records the delay request and response messages during the transmission process, determines the time delay and offset, calculates the time error, and adjusts its own analysis and comparison time according to this time error to ensure the synchronization of analysis and comparison.

[0098] The above high-precision synchronous triggering mechanism proposed by the present invention forms a clock synchronous triggering mechanism between the signal source unit and the secondary measurement unit by constructing a dual-redundant clock source, a dynamic switching mechanism and a fault detection mechanism; after time synchronization, the IEEE 1588 PTP precision time protocol is adopted, and by using the PPS second pulse, nanosecond-level synchronous triggering is achieved for multiple signal source units and secondary measurement units at different positions, forming a synchronous triggering mechanism between the display control unit, the signal source unit and the secondary measurement unit; maintaining nanosecond-level synchronization in a strongly interfering environment can ensure the real-time accuracy of output and measurement.

[0099] On this basis, a multi-channel parallel processing architecture is also constructed. The multi-channel parallel processing architecture includes: a signal conditioning circuit, a multi-channel ADC module, and a parallel processing module. Among them, the signal conditioning circuit isolates, filters, and amplifies the monitored voltage signal and current signal, and then inputs them into the multi-channel ADC module for synchronous sampling, and then connects to the parallel processing module, and uses the DMA channel to directly transfer the ADC data for parallel processing; including:

[0100] ① After the signal source unit outputs a large voltage and a large current, real-time monitoring of the multi-channel output value is performed, and the secondary measurement unit performs multi-channel sampling and measurement on the secondary voltage and secondary current signals converted by the electronic current transformer.

[0101] ② The signal conditioning circuit uses a precision resistor voltage divider and an isolation type voltage transformer network to isolate and convert the large voltage, and then through cascade filtering and amplification, it inputs into the multi-channel ADC module for synchronous sampling; the signal conditioning circuit uses a current transformer and a precision operational amplifier conversion network to convert the large current into a current-voltage conversion, and then through filtering and amplification, it inputs into the multi-channel ADC module for synchronous sampling; according to the magnitude of the monitored current value and the magnitude of the output set value, dynamic correction is performed to implement a closed-loop correction system.

[0102] ③ The signal conditioning circuit performs operational amplifier sampling, filtering and amplification processing on the monitored secondary voltage signal and inputs it into the multi-channel ADC module for synchronous sampling; the signal conditioning circuit performs operational amplifier sampling, filtering and amplification processing on the monitored secondary current signal and inputs it into the multi-channel ADC module for synchronous sampling.

[0103] As an optional embodiment, the multi-channel ADC sampling module selects an 8-channel, 16-bit AD7606 processing module, reads the internal status register of the ADC, and compensates for the offset between channels. The parallel processing module selects the minimum processing system of the STM32H7 series chip with a dual-core Cortex-M7 to calculate the RMS value in real time.

[0104] The present invention constructs a multi-channel parallel processing architecture, uses signal processing algorithms to synchronously obtain multi-channel data, and performs dynamic correction according to the magnitude of the monitored current and the magnitude of the output set value to implement a closed-loop correction system, which can improve the test accuracy and test efficiency.

[0105] At the same time, the display control unit is used for parameter setting, synchronously controlling the output of the signal source unit, and collecting and measuring the secondary measurement unit. In the automatic control system, the parameters can be adjusted and output; and according to the high voltage and large current ranges output by the signal source unit, overload protection and emergency stop functions are set to avoid exceeding the safety range of the equipment. According to the real-time feedback situation of the measurement, and the transformation ratio and frequency response characteristics of the electronic current transformer to be measured, the output parameters are dynamically adjusted, which can ensure the accuracy and safety of the test. In addition, the display control unit synchronously obtains and analyzes the data in real time, performs polarity and wiring determination through ratio calculation with phase compensation and joint analysis, and automatically exports a report on the measurement results; automated operation and reduced manual intervention can achieve intelligent diagnosis and greatly reduce the workload.

[0106] Furthermore, when performing phase compensation, a dynamic error compensation model is adopted to achieve high-precision measurement over the full range; a multi-dimensional feature space including harmonic distortion rate, phase offset, and transient response time is constructed, input into a quantum convolutional neural network, and multi-dimensional non-linear fitting is performed to achieve dynamic multi-dimensional compensation, breaking through the limitations of traditional single-factor compensation and suppressing the coupling error of multiple physical fields.

[0107] Further, during phase analysis, the S transform is used to extract the time-frequency ridge line of the excitation-response signal. Combining with the cross high-order cumulant phase analysis, a polarity discrimination matrix is constructed for intelligent polarity diagnosis.

[0108] Further, for automatic wiring discrimination, through improving the associated matrix analysis method, automatic identification and positioning of incorrect wiring are realized.

[0109] Further, a standardized report is generated, which is to automatically generate a templated report for export based on the judgment results of transformation ratio, polarity, and wiring.

[0110] Those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented by a general-purpose computer device. Optionally, they can be implemented by program codes executable by a computing device. Thus, they can be stored in a storage device and executed by the computing device, or they can be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them can be fabricated into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0111] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made without creative efforts by those skilled in the art are still within the protection scope of the present invention.

Claims

1. An electronic transformer ratio polarity measurement system, characterized in that: include: signal source unit, display control unit and secondary measurement unit; The signal source unit is connected to the primary end of the electronic transformer, and is used to output a primary high voltage and a primary high current to the electronic transformer; wherein the signal source unit is provided with a multi-channel parallel processing architecture for correcting the primary high voltage and the primary high current; The secondary measuring unit is connected to the secondary terminal of the electronic transformer and is used to measure the voltage and current of the secondary terminal of the electronic transformer; The display control unit synchronously controls the output of the signal source unit and the measurement state of the secondary measurement unit based on a high-precision synchronous trigger mechanism, and synchronously acquires data in real time for analysis, thereby realizing the transformation ratio polarity measurement of the electronic transformer.

2. The electronic transformer ratio polarity measurement system according to claim 1, characterized in that: The signal source unit includes a first processing module, a second processing module, a first communication module, a second communication module, a switching power supply module, a measuring component and a pressure-flow output component.

3. An electronic transformer ratio polarity measurement system according to any one of claims 1 to 2, characterized in that: A signal conditioning circuit is provided in the measurement component, and a parallel processing module is integrated in the first processing module; the signal conditioning circuit and the parallel processing module are connected through a multi-channel ADC module; wherein the signal conditioning circuit, the parallel processing module and the multi-channel ADC module together constitute a multi-channel parallel processing architecture.

4. The electronic transformer ratio polarity measurement system according to claim 2, characterized in that: The measurement component includes a primary three-phase voltage measurement module and a primary three-phase current measurement module; the voltage and current output component includes an inverter switching output module, a boost module, a primary three-phase voltage output module, a current boost module, and a primary three-phase current output module.

5. The electronic transformer ratio polarity measurement system according to claim 1, characterized in that: The secondary measurement unit includes a pressure flow collection component, a third processing module, a third channel module and a fourth channel module.

6. The electronic transformer ratio polarity measurement system according to claim 5, characterized in that: The voltage-current acquisition component includes a secondary three-phase voltage acquisition module and a secondary three-phase current acquisition module.

7. The electronic transformer ratio polarity measurement system according to claim 5, characterized in that: The third channel module in the secondary measurement unit performs signal synchronization transmission with the first communication module in the signal source unit through a clock synchronization trigger mechanism.

8. The electronic transformer ratio polarity measurement system according to claim 1, characterized in that: The display control unit includes a fifth communication module, a control module and a display module.

9. An electronic transformer ratio polarity measurement system as claimed in claim 8, characterized in that: The fifth communication module in the display control unit performs synchronous signal transmission with the second communication module in the signal source unit and the fourth channel module in the secondary measurement unit respectively through a synchronous trigger mechanism.

10. A method for measuring the polarity of an electronic transformer ratio, used in the electronic transformer ratio polarity measurement system according to any one of claims 1 to 9, characterized in that: include: Obtain the fundamental wave of the output and measured voltage and current amplitudes for phase compensation; construct a multidimensional feature space including harmonic distortion rate, phase offset, and transient response time, and input it into the quantum convolutional neural network for multidimensional nonlinear fitting to achieve ratio calculation; The S transform is used to extract the time-frequency ridges of the excitation-response signal, combined with the phase analysis of the mutual high-order cumulants; a polarity discrimination matrix is ​​constructed, dynamic monitoring is performed, and intelligent polarity diagnosis is performed; Based on the correlation matrix analysis method, a wiring state feature matrix is ​​established according to the single-phase wiring mode, three-phase star wiring mode and three-phase triangle wiring mode of the electronic transformer wiring system to automatically identify and locate the wrong wiring, so as to realize automatic wiring judgment; Through joint analysis, abnormal detection and abnormal alarm prompts are carried out; The measurement and analysis results are structured, key parameters are automatically filled in, and templated reports are automatically generated and exported based on the transformation ratio, polarity, and wiring judgment results.

Images