Device and method for automatically checking polarity of current transformer

Abstract

The invention relates to the field of electric power detection, in particular to a device and a method for automatically verifying the polarity of a current transformer. The device comprises a host unit and a slave unit, the host unit is arranged on the primary side of a current transformer, and the device comprises a pulse voltage generator used for generating forward pulse current on the primary side of the current transformer; the host digital-to-analog conversion module is used for converting an analog signal of the forward pulse current into a digital signal; the logic judgment module is used for judging the polarity of the current transformer according to the data; the host interaction interface is used for displaying a verification result and operation control; the slave unit is arranged on the secondary side of the current transformer and comprises a secondary wire access port used for accessing a secondary wire of the current transformer to collect secondary current; the slave analog-to-digital conversion module is used for converting the secondary current analog current signal into a digital signal; and the host communication module is in communication connection with the slave communication module. The current transformer polarity verification accuracy is high, the operation is simple and convenient, the efficiency is high, and the human error rate is reduced.

Description

Technical Field

[0001] The invention relates to the field of electric power detection, and in particular to a current transformer polarity automatic verification device and method. Background Art

[0002] In power systems, the polarity of current transformers (CTs) is critical to the accuracy of protection and measurement equipment. Incorrect polarity configuration may cause relay protection devices to malfunction, resulting in equipment damage, affecting the safe and stable operation of the power grid, and even power grid oscillation. In addition, polarity errors in metering and measurement loops can lead to inaccurate data, causing economic losses and grid dispatching decision errors. Therefore, ensuring the correct polarity of current transformers is the top priority in power system maintenance. With the continuous expansion of the power grid and the continuous investment of new equipment, the demand for automatic verification of current transformer polarity is becoming increasingly urgent.

[0003] Traditional current transformer polarity verification methods include DC method, AC method and instrument method, each of which has limitations. The DC method relies on a DC source and a pointer meter, and the equipment is simple but the reliability is low. The AC method (single current method) can only verify the polarity relationship between multiple CTs, and cannot determine the polarity correctness of a single CT, and is limited by the non-adjustable AC voltage and voltmeter selection. The instrument method uses a current transformer calibrator, which has a small workload, but is not a special polarity inspection tool and has disadvantages.

[0004] In actual maintenance work, there are still many problems, such as communication difficulties caused by the long distance between equipment, operational errors, and large workload of phase and line switching. These problems seriously restrict the efficiency and accuracy of maintenance. For example, patent CN109143143B describes an intelligent detection device and method for the polarity of the secondary side of the current transformer in a substation. This method improves the test efficiency by using the verification host and the acquisition terminal in coordination. However, this method still relies on wired connections, which limits the flexibility of application. Patent CN112083372B provides a current transformer polarity identification method and system, which identifies the polarity by vector analysis of the main transformer fault recorder, but this method requires repeated testing after equipment modification or replacement, which is inefficient.

[0005] The present application aims to provide a current transformer polarity automatic verification device and method to solve the above-mentioned problems in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a current transformer polarity automatic verification device and method to solve the problems of low accuracy, complex operation, low efficiency and high human error rate in the current transformer polarity verification in the prior art.

[0007] To achieve the above purpose, the following technical solution is adopted.

[0008] A current transformer polarity automatic verification device, comprising:

[0009] The host unit is arranged on the primary side of the current transformer, and the host unit includes:

[0010] A pulse voltage generator is used to generate a forward pulse current on the primary side of the current transformer; a host digital-to-analog conversion module is used to convert the analog signal of the forward pulse current into a digital signal; a host communication module is used to perform wireless data communication with the slave unit; a logic judgment module is used to compare and analyze the data transmitted by the slave unit with the digital signal of the host unit to judge the polarity of the current transformer; a host interaction interface is used to display the verification results and operation control;

[0011] A slave unit is arranged on the secondary side of the current transformer, and the slave unit includes:

[0012] A secondary line access port is used to access the secondary line of the current transformer to collect the secondary current; a slave analog-to-digital conversion module is used to convert the collected secondary current analog current signal into a digital signal; a slave communication module is used to perform wireless data communication with the host unit and transmit the digital signal of the secondary current to the host unit.

[0013] Optionally, there are multiple secondary line access ports, which are respectively used to access secondary lines of different current transformers.

[0014] Optionally, the host unit further includes a host clock synchronization module, and the slave unit further includes a slave clock synchronization module, and the host clock synchronization module and the slave clock synchronization module are used to maintain synchronization of data transmission.

[0015] Optionally, the host further includes an output voltage regulating module for performing polarity verification of current transformers of different types of primary devices by adjusting the output pulse voltage amplitude.

[0016] Optionally, the slave unit further includes a slave interaction interface for synchronizing the polarity check result of the host unit to the slave unit for display.

[0017] A method for automatically checking the polarity of a current transformer comprises the following steps:

[0018] S1, a pulse voltage generator of the host unit generates a positive pulse current, which flows into the primary side P1 terminal of the current transformer and flows out from the P2 terminal;

[0019] S2, using a host digital-to-analog conversion module to convert the analog signal of the forward pulse current into a digital signal;

[0020] S3, the secondary line access port of the slave unit is connected to the secondary line of the current transformer, and the secondary current generated is collected;

[0021] S4, using the slave analog-to-digital conversion module to convert the collected secondary current analog signal into a digital signal;

[0022] S5, wirelessly transmitting the digital signal of the secondary current to the host unit through the slave communication module;

[0023] S6, the logic judgment module receives the secondary current digital signal transmitted by the slave unit, and compares and analyzes it with the digital signal of the forward pulse current generated by the host unit;

[0024] S7. According to the comparison and analysis results, the logic judgment module judges whether the polarity of the current transformer is correct;

[0025] S8. If the judgment result indicates that the polarity is incorrect, the host unit prompts the operator to make corrections through the host interactive interface;

[0026] S9. If the judgment result shows that the polarity is correct, the host unit displays the verification result through the host interactive interface.

[0027] Optionally, the following steps are also included:

[0028] S10, the host unit wirelessly transmits the verification result to the slave unit, and the slave interaction interface of the slave unit synchronously displays the verification result.

[0029] Optionally, the following steps are also included:

[0030] After the pulse voltage generator of the host unit generates a forward pulse current, the host clock synchronization module synchronously records the timestamp of the generated pulse and includes the timestamp information in the digital signal;

[0031] While the secondary line access port of the slave unit collects the secondary current, the slave clock synchronization module synchronously records the collected timestamp and includes the timestamp information in the digital signal;

[0032] During the wireless data communication process, the host communication module and the slave communication module use the timestamp information of their respective modules to synchronize and match the data packets so that the transmitted data correspond;

[0033] When performing comparative analysis, the logic judgment module compares the current amplitude and phase, and also compares the timestamp information, so that the current signals on the primary and secondary sides are consistent in time;

[0034] If the logic judgment module detects that the timestamp information does not match, it will trigger the synchronization correction process, and resynchronize the data by adjusting the trigger time of the pulse voltage generator through the host unit or adjusting the trigger time of the acquisition through the slave unit;

[0035] After completing the polarity check, the master unit wirelessly transmits the check result and synchronization status information to the slave unit;

[0036] After receiving the verification result and synchronization status information, the slave unit displays the verification result and synchronization status information through the slave interactive interface;

[0037] If the slave unit shows the synchronization status as Out of Sync, adjust the device settings or repeat the calibration process.

[0038] Optionally, the following steps are also included:

[0039] The output voltage regulation module of the host unit automatically adjusts the amplitude of the forward pulse current generated by the pulse voltage generator according to the preset parameters or the type of primary equipment automatically detected, so as to meet the polarity verification requirements of the current transformer of different types of primary equipment;

[0040] If the logic judgment module finds that the polarity of the current transformer is incorrect after comparative analysis, and determines that the incorrectness is caused by inappropriate amplitude of the primary side pulse voltage, the output voltage regulation module will adjust the output amplitude of the pulse voltage generator according to the feedback signal of the logic judgment module, and re-execute the verification process.

[0041] Optionally, the specific steps of step S6 and step S7 include:

[0042] The logic judgment module receives the secondary current digital signal transmitted by the slave unit through the slave communication module, and the secondary current digital signal includes the amplitude, frequency, phase and timestamp information of the secondary current;

[0043] The logic judgment module simultaneously obtains the digital signal of the forward pulse current generated by the pulse voltage generator of the host unit, and the digital signal of the forward pulse current also includes the current amplitude, frequency, phase and time stamp information;

[0044] The logic judgment module pre-processes the two digital signals, including filtering, sampling and normalization, eliminating noise and ensuring signal format consistency;

[0045] The logic judgment module extracts the key characteristic parameters of two digital signals, including amplitude ratio, phase difference and time delay;

[0046] The logic judgment module compares the amplitude ratio and phase difference according to the preset polarity verification standard to determine whether the polarity relationship between the primary and secondary currents meets expectations;

[0047] If the amplitude ratio and phase difference are within the preset threshold range, the logic judgment module further checks the time delay to ensure the time correspondence between the primary and secondary currents;

[0048] The logic judgment module combines the comparison results of the amplitude ratio, the phase difference and the time delay to draw a conclusion as to whether the polarity of the current transformer is correct or not as a judgment result.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The present invention adopts 5G to transmit data, reduces delays, improves data accuracy, avoids human errors, and makes the current transformer verification results more accurate; adopts the master-slave mode, can carry out long-distance, split operation, making the operation mode more flexible, and adopts 5G transmission to reduce cable laying, improve work efficiency, and avoid inaccurate data measurement caused by cable grounding, damage, and poor contact; the slave machine contains multiple secondary line access ports, which can verify the polarity of multiple current transformer windings at the same time, and there is no need to plug and unplug the experimental cables one by one, which not only increases work efficiency, but also avoids erroneous results caused by human operating errors; the device is small, portable and light, which is convenient for experimental personnel to transfer operations within the substation, reducing the workload of on-site personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a module schematic diagram of an embodiment of a current transformer polarity automatic verification device according to the present invention.

[0052] Figure 2 The figure is a schematic flow chart of the steps of an embodiment of a method for automatic polarity verification of a current transformer according to the present invention. DETAILED DESCRIPTION

[0053] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0054] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention.

[0055] Example 1

[0056] like Figure 1 As shown, a current transformer polarity automatic verification device is characterized in that the device includes a host unit and a slave unit, wherein:

[0057] The host unit is arranged on the primary side of the current transformer and specifically includes the following components:

[0058] A pulse voltage generator, used for generating a positive pulse current of a specific amplitude and shape, and injecting the pulse current into the primary side of the current transformer, so as to generate a primary current in the current transformer;

[0059] The host digital-to-analog conversion module is used to convert the analog signal of the forward pulse current generated by the pulse voltage generator into a digital signal for subsequent digital processing and analysis;

[0060] The host communication module is used to perform wireless data communication with the slave unit, transmit the digital signal generated by the host unit to the slave unit, and receive the digital signal transmitted by the slave unit;

[0061] The logic judgment module is used to receive the digital signal transmitted by the slave unit, compare and analyze it with the digital signal generated by the master unit, and judge whether the polarity of the current transformer is correct through a preset algorithm;

[0062] The host interactive interface is used to display the verification results and provide operation control, including displaying the verification results of the logic judgment module and allowing the user to input instructions to control the verification process.

[0063] The slave unit is arranged on the secondary side of the current transformer and specifically includes the following components:

[0064] A secondary line access port is used to access the secondary line of the current transformer and collect the secondary current generated thereby;

[0065] A slave analog-to-digital conversion module is used to convert the analog signal of the secondary current collected from the secondary line access port into a digital signal;

[0066] A slave communication module is used to perform wireless data communication with the host unit and transmit the digital signal generated by the slave unit to the host unit;

[0067] The slave unit interactive interface is used to display the verification results transmitted by the master unit and provide intuitive feedback information to the operator.

[0068] The working process of the device is as follows:

[0069] The pulse voltage generator of the host unit generates a positive pulse current, which flows into the primary side P1 terminal of the current transformer and flows out from the P2 terminal;

[0070] The host digital-to-analog conversion module converts the analog signal of the forward pulse current into a digital signal;

[0071] The secondary line access port of the slave unit is connected to the secondary line of the current transformer, and the secondary current generated thereby is collected;

[0072] The slave analog-to-digital conversion module converts the collected secondary current analog signal into a digital signal;

[0073] The slave communication module wirelessly transmits the digital signal of the secondary current to the master unit;

[0074] The logic judgment module of the host unit receives the secondary current digital signal transmitted by the slave unit, and compares and analyzes it with the digital signal of the forward pulse current generated by the host unit;

[0075] The logic judgment module judges whether the polarity of the current transformer is correct based on the comparison and analysis results;

[0076] The host interactive interface of the host unit displays the verification results and provides operation control, allowing the user to perform corresponding operations based on the verification results;

[0077] If necessary, the host unit wirelessly transmits the verification result to the slave unit, and the slave interaction interface of the slave unit synchronously displays the verification result.

[0078] Through the above implementation, the current transformer polarity automatic verification device can automatically and accurately verify the polarity of the current transformer, reduce the complexity and error rate of manual operation, and improve the safety and reliability of the power system.

[0079] As a preferred example, the slave unit has multiple secondary line access ports for respectively accessing the secondary lines of different current transformers to achieve the function of simultaneously verifying multiple current transformers. Specifically, the slave unit is designed with 12 independent secondary line access ports, each of which can independently access the secondary line of a current transformer, thereby allowing the device to perform polarity verification on 12 current transformers at the same time.

[0080] During operation, each secondary line access point will collect the current signal from the secondary side of the corresponding current transformer. The slave analog-to-digital conversion module is responsible for converting these analog current signals into digital signals for subsequent processing. Each digital signal will contain a specific identifier related to the respective current transformer to ensure that the signals from different current transformers can be distinguished during subsequent data processing and analysis.

[0081] The slave communication module wirelessly transmits these digital signals with specific identification to the host unit. The logic judgment module of the host unit receives these digital signals and compares and analyzes them with the digital signals of the forward pulse current generated by the host unit. The logic judgment module uses a preset algorithm to determine whether the polarity of each current transformer is correct based on the amplitude, phase and timestamp information of the primary and secondary current signals.

[0082] The host interactive interface of the host unit is used to display the calibration results of each current transformer and provide operation control. If the polarity of a current transformer is incorrect, the host interactive interface will prompt the operator to make necessary corrections. At the same time, the host unit wirelessly transmits the calibration results to the slave unit, and the slave interactive interface of the slave unit synchronously displays the calibration results of all 12 current transformers, providing intuitive feedback information to the operator.

[0083] Through this design, the current transformer polarity automatic verification device can efficiently and simultaneously verify the polarity of multiple current transformers, greatly improving the efficiency and accuracy of the verification work, reducing the complexity and error rate of manual operation, and improving the safety and reliability of the power system.

[0084] As a preferred example, the host unit and the slave unit are both equipped with a clock synchronization module to maintain the synchronization of data transmission, and the host unit and the slave unit respectively include a host clock synchronization module and a slave clock synchronization module. The purpose of these modules is to ensure that the data transmitted between the host unit and the slave unit can be accurately synchronized, thereby ensuring the accuracy and reliability of the current transformer polarity verification.

[0085] In the host unit, the host clock synchronization module is responsible for generating a precise clock signal, which is used to mark the exact time point when the pulse voltage generator generates a positive pulse current. This time point, or timestamp, is then embedded in the digital signal converted by the host digital-to-analog conversion module. In this way, each digital signal contains the precise time information corresponding to it, ensuring the time synchronization of the signal.

[0086] In the slave unit, the slave clock synchronization module performs a similar function, which provides accurate timestamps for each digital signal converted by the slave analog-to-digital conversion module. These timestamps reflect the exact moment when the slave unit acquires the secondary current signal.

[0087] During the wireless data communication process, the host communication module and the slave communication module use the timestamp information of each module to synchronize and match the data packets. This means that when the slave unit sends the collected digital signals to the host unit, the host unit can accurately match and compare these signals with the digital signals generated by the host unit based on the timestamp information.

[0088] In order to achieve accurate synchronization, the master clock synchronization module and the slave clock synchronization module communicate through a synchronization protocol. This protocol can be based on the Network Time Protocol (NTP) or other high-precision time synchronization technology. In this way, even if there is a delay in wireless transmission, the data packets can be accurately aligned and compared, ensuring the accuracy of the verification process.

[0089] In practical applications, if the logic judgment module detects that the timestamp information does not match or there is a problem with data synchronization, the master clock synchronization module and the slave clock synchronization module can adjust their respective clock signals to resynchronize the data. This may involve adjusting the trigger time of the pulse voltage generator or the acquisition trigger time of the slave unit to ensure the temporal consistency of the current signals on the primary and secondary sides.

[0090] As a preferred example, the host unit includes an output voltage adjustment module, which is used to adjust the amplitude of the output pulse voltage to meet the current transformer polarity verification requirements of different types of primary devices, as follows:

[0091] The output voltage regulation module in the host unit is a key component that allows the operator or automatic control system to adjust the amplitude of the pulse voltage generated by the pulse voltage generator according to the specific requirements of the primary equipment. The module includes a voltage control circuit that is able to receive instructions from user input or automatic control system and adjust the output of the pulse voltage generator accordingly.

[0092] In actual operation, the output voltage regulation module may include a microprocessor or a digital signal processor connected to one or more analog switches and variable resistors to form an adjustable voltage circuit. By changing the state of the analog switch and adjusting the value of the variable resistor, the output voltage regulation module can accurately control the output voltage amplitude of the pulse voltage generator.

[0093] The module also includes a user interface that allows the operator to enter the type of primary device or the desired pulse voltage amplitude. The user interface can be a touch screen display, a set of buttons or knobs, or other form of input device. The operator can use this interface to select a preset voltage setting or manually enter a specific amplitude.

[0094] The output voltage regulation module also has an automatic detection and adjustment function. It can receive device parameters through the communication interface with the primary device and then automatically adjust the pulse voltage amplitude to match these parameters. This automatic adjustment function ensures that the device can adapt to the requirements of different devices without manual intervention.

[0095] During the voltage regulation process, the output voltage regulation module monitors the output of the pulse voltage generator in real time and ensures that the output voltage is within a safe and effective range. If the output voltage exceeds the preset range, the module will adjust the settings to ensure the safety and accuracy of the calibration process.

[0096] Through this output voltage adjustment function, the current transformer polarity automatic verification device can adapt to various primary devices and provide flexible and accurate polarity verification, thereby improving the adaptability and reliability of the verification process.

[0097] As a preferred example, the slave unit includes a slave interaction interface, which is used to display the polarity check result transmitted by the host unit, and the communication between the host unit and the slave unit is realized through a 5G communication module. The specific implementation is as follows:

[0098] The slave unit of the device is equipped with a slave interactive interface, which is a user interface for real-time display of the polarity check result processed by the logic judgment module of the host unit. The slave interactive interface can be implemented in various forms, such as a touch screen display, a liquid crystal display (LCD), a light emitting diode display (LED) or an organic light emitting diode display (OLED), and other display technologies suitable for field operation.

[0099] The slave interactive interface not only displays the results of the polarity check, but may also provide additional information such as check status, error code, timestamp, check history, etc. This information helps the operator quickly understand the status of the current transformer and perform further operations or diagnosis when necessary.

[0100] The communication between the master unit and the slave unit is achieved through 5G communication modules. These 5G communication modules are key components of the device. They use the high speed, low latency and high reliability characteristics of the fifth generation mobile communication technology (5G) to ensure the real-time and accuracy of data transmission. 5G communication modules include but are not limited to 5G wireless modems, antennas, RF front ends, and necessary signal processing hardware.

[0101] In actual applications, the host communication module sends the polarity verification results in the form of digital signals to the slave communication module through the 5G network. The slave communication module receives these signals and transmits them to the slave interaction interface of the slave unit for display. Due to the high-speed data transmission capability of the 5G communication module, the slave interaction interface can update the verification results in real time, maintaining data synchronization and accuracy even in remote or mobile environments.

[0102] In addition, the 5G communication module also supports high-bandwidth data transmission, enabling the host unit to transmit large amounts of data, such as high-definition graphics, videos or other multimedia content, to enhance the user experience of the slave interactive interface. This high-speed communication capability also makes remote troubleshooting and technical support more efficient.

[0103] Example 2

[0104] The host unit generates a positive voltage pulse, causing the current to flow from the primary device P1 terminal to the P2 terminal; the secondary current of the current transformer collected by the slave unit flows from S1 to S2. The slave unit transmits the collected current information to the host unit through the 5G network. After receiving the information, the host unit compares the data and gives the current transformer polarity verification result after comprehensive logical judgment.

[0105] Example 3

[0106] like Figure 2 As shown, a method for automatically checking the polarity of a current transformer includes the following detailed steps:

[0107] First, the operator sets the pulse voltage generator of the host unit to generate a positive pulse current with a specific amplitude and shape. This current flows into the primary side P1 terminal of the current transformer and flows out from the P2 terminal, simulating the flow direction of the actual current.

[0108] The digital-to-analog conversion module of the host unit samples and quantizes the analog signal of the forward pulse current and converts it into a digital signal for subsequent digital processing and analysis.

[0109] The secondary line access ports of the slave units are connected to the secondary lines of the current transformers and collect the secondary current generated thereby. These access ports are designed to simultaneously access the secondary lines of multiple current transformers to achieve polarity verification of multiple current transformers.

[0110] The analog-to-digital conversion module of the slave unit converts the collected secondary current analog signals into digital signals, which are then used to compare with the current signals on the primary side.

[0111] The slave communication module wirelessly transmits the digital signal of the secondary current to the master unit through 5G communication technology. This step takes advantage of the high rate and low latency characteristics of the 5G communication module to ensure the real-time and accuracy of the data.

[0112] The logic judgment module of the master unit receives the secondary current digital signal transmitted by the slave unit and compares and analyzes it with the digital signal of the forward pulse current generated by the master unit. This step involves a detailed comparison of the amplitude, phase and time stamp information of the two digital signals.

[0113] Based on the comparison and analysis results, the logic judgment module determines whether the polarity of the current transformer is correct. If the current signals on the primary and secondary sides match in amplitude, phase and timestamp, the polarity is considered correct.

[0114] As a specific example of the above steps, the logic judgment module first receives the secondary current digital signal transmitted by the slave unit through the slave communication module. These digital signals contain the amplitude, frequency, phase and timestamp information of the secondary current in detail, which are converted from the analog signal by the analog-to-digital conversion module for subsequent polarity verification. At the same time, the logic judgment module obtains the digital signal of the forward pulse current generated by the pulse voltage generator of the host unit. These digital signals also include the amplitude, frequency, phase and timestamp information of the current, which are the results of the conversion of the host digital-to-analog conversion module and are used to compare with the digital signal transmitted by the slave unit. The logic judgment module preprocesses the two digital signals to eliminate noise and ensure the consistency of the signal format. The preprocessing steps include filtering to remove unnecessary frequency components, sampling to obtain discrete data points, and normalization to unify the dimensions and proportions of the signals. The logic judgment module extracts the key characteristic parameters of the two digital signals, including amplitude ratio, phase difference and time delay. The amplitude ratio refers to the ratio of the amplitude of the current on the primary side and the secondary side, the phase difference refers to the angular difference in the phase of the two current signals, and the time delay refers to the time difference between the two signals. The logic judgment module compares the amplitude ratio and phase difference according to the preset polarity verification standards to determine whether the polarity relationship between the primary and secondary currents meets expectations. These standards may be based on the technical specifications of the current transformer and the operating requirements of the power grid. If the amplitude ratio and phase difference are within the preset threshold range, the logic judgment module further checks the time delay to ensure the time correspondence between the primary and secondary currents. This step is to verify whether the two signals are synchronized in time, taking into account the delays that may be introduced by signal transmission and processing. The logic judgment module comprehensively compares the results of the amplitude ratio, phase difference and time delay to conclude whether the polarity of the current transformer is correct. This conclusion is based on the comparative analysis of all key characteristic parameters, ensuring the accuracy and reliability of the verification results. Through these detailed steps, the current transformer polarity automatic verification method can accurately determine the polarity of the current transformer and ensure the safe and stable operation of the power system.

[0115] If the result indicates that the polarity is incorrect, the host unit prompts the operator to make a correction through the host interactive interface. This may involve adjusting the primary or secondary connection, or recalibrating the device.

[0116] If the judgment result indicates that the polarity is correct, the host unit displays the result of the verification through the host interactive interface. This step provides clear feedback to the user, indicating that the polarity of the current transformer is set correctly.

[0117] The automatic polarity verification method for current transformers provides an automated, efficient and accurate verification process, which reduces the errors and complexity of manual operations and improves the safety and reliability of the power system.

[0118] As a preferred example, the method further comprises the following steps:

[0119] After the logic judgment module completes the judgment of the polarity of the current transformer, the host unit transmits the verification result to the slave unit wirelessly through the host communication module. This step uses the 5G communication module built into the host unit to ensure high-speed and stable data transmission.

[0120] The slave unit receives the verification result from the master unit through its slave communication module. The slave communication module processes the received data and transmits it to the slave interaction interface of the slave unit.

[0121] The slave interactive interface is responsible for displaying the received verification results to the operator in real time. This interface can be a touch screen display or other type of display screen, which can clearly display the polarity verification results of each current transformer, including whether the polarity is correct, the verification time, and any relevant diagnostic information.

[0122] The verification results displayed on the slave interactive interface include but are not limited to:

[0123] Polarity verification status (pass or fail) of each current transformer;

[0124] The specific reasons for the verification failure (such as polarity error, signal synchronization problem, etc.);

[0125] Key parameters during the verification process, such as the amplitude and phase difference of the primary and secondary currents;

[0126] Verify the timestamp of the operation for easy recording and tracking;

[0127] Any system warning or error codes, and possible suggestions for solutions.

[0128] The slave interface also allows the operator to perform user interactions, such as confirming calibration results, requesting a repeat calibration, or entering specific calibration parameters. These interactions can be performed via a touch screen, buttons, keyboard, or other input devices.

[0129] The slave unit may also have data logging capabilities, storing detailed results of each calibration in internal memory for subsequent analysis and reporting. The operator can retrieve and export this data as needed.

[0130] As a preferred example, the method further includes the following steps:

[0131] While the pulse voltage generator of the host unit generates a forward pulse current, the host clock synchronization module synchronously records the precise timestamp of the generated pulse. This timestamp reflects the moment when the pulse current is generated and is embedded in the digital signal converted by the host digital-to-analog conversion module.

[0132] When the secondary line access port of the slave unit collects the secondary current, the slave clock synchronization module synchronously records the precise timestamp of the collection. This timestamp reflects the moment of secondary current collection and is embedded in the digital signal converted by the slave analog-to-digital conversion module.

[0133] During the wireless data communication process, the host communication module and the slave communication module use the timestamp information of their respective modules to synchronize and match the data packets. This step ensures the temporal correspondence between the secondary current digital signal transmitted from the slave unit to the host unit and the primary current digital signal generated by the host unit.

[0134] The logic judgment module compares and analyzes the amplitude and phase of the primary and secondary currents, and also compares the timestamp information of both sides. This step ensures the temporal consistency of the primary and secondary current signals, and increases the accuracy of the verification.

[0135] If the logic judgment module detects that the timestamp information does not match, indicating that the current signals on the primary and secondary sides are inconsistent in time, the synchronization correction process will be triggered. This process resynchronizes the data by adjusting the trigger time of the pulse voltage generator of the host unit or the trigger time collected by the slave unit to ensure the consistency of the timestamp.

[0136] After completing the polarity check, the host unit wirelessly transmits the check result and synchronization status information to the slave unit. This step ensures that the slave unit can receive complete verification information, including whether the current polarity is correct and the matching status of the timestamp.

[0137] After receiving the verification result and synchronization status information, the slave unit displays the verification result and synchronization status information through the slave interactive interface. This step provides the operator with an intuitive understanding of the verification process and synchronization status.

[0138] If the slave unit displays the synchronization status as out of sync, the operator can adjust the device settings or re-verify the process according to the prompt. This step ensures that in the event of a timestamp mismatch, timely measures can be taken to resynchronize the data and ensure the accuracy of the verification.

[0139] As a preferred example, the host unit includes an output voltage adjustment module, which is designed to automatically adjust the amplitude of the forward pulse current generated by the pulse voltage generator according to preset parameters or automatically detected primary device types. This step ensures that the verification process can adapt to the specific requirements of different types of primary devices, and improves the flexibility and applicability of the verification.

[0140] The output voltage regulation module can receive preset parameters input by the operator, or automatically detect the type and calibration requirements of the primary equipment through the communication interface with the primary equipment. These parameters and requirements may include the required pulse voltage amplitude range, shape, duration, etc.

[0141] The output voltage regulation module includes a regulation mechanism that can adjust the output amplitude of the pulse voltage generator. The regulation mechanism can include a microprocessor, a digital signal processor, an analog switch, a variable resistor, a voltage control circuit, etc. to achieve accurate voltage regulation.

[0142] If the logic judgment module finds that the polarity of the current transformer is incorrect after comparative analysis, and determines that the incorrectness is caused by inappropriate amplitude of the primary side pulse voltage, the output voltage regulation module will adjust the output amplitude of the pulse voltage generator according to the feedback signal of the logic judgment module.

[0143] After adjusting the pulse voltage amplitude, the output voltage regulation module will trigger the pulse voltage generator to regenerate the adjusted forward pulse current, thereby re-executing the verification process. This step ensures that even if the initial verification fails, the system can automatically adjust and re-verify, improving the accuracy and reliability of the verification.

[0144] During the entire verification process, the output voltage regulation module continuously monitors the amplitude of the primary side pulse voltage and makes necessary adjustments based on the feedback from the logic judgment module. This continuous monitoring and adjustment mechanism ensures the dynamic adaptability of the verification process, especially when facing changing grid conditions.

[0145] The automatic polarity verification method for current transformers not only improves the accuracy of verification, but also enhances the adaptability to different types of primary equipment and grid conditions, ensuring the flexibility and effectiveness of current transformer polarity verification.

[0146] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A current transformer polarity automatic verification device, characterized in that: include, The host unit is arranged on the primary side of the current transformer, and the host unit includes: A pulse voltage generator is used to generate a forward pulse current on the primary side of the current transformer; a host digital-to-analog conversion module is used to convert the analog signal of the forward pulse current into a digital signal; a host communication module is used to perform wireless data communication with the slave unit; a logic judgment module is used to compare and analyze the data transmitted by the slave unit with the digital signal of the host unit to judge the polarity of the current transformer; a host interaction interface is used to display the verification results and operation control; A slave unit is arranged on the secondary side of the current transformer, and the slave unit includes: A secondary line access port is used to access the secondary line of the current transformer to collect the secondary current; a slave analog-to-digital conversion module is used to convert the collected secondary current analog current signal into a digital signal; a slave communication module is used to perform wireless data communication with the host unit and transmit the digital signal of the secondary current to the host unit.

2. The current transformer polarity automatic verification device according to claim 1, characterized in that: There are multiple secondary line access ports, which are respectively used to access the secondary lines of different current transformers.

3. The current transformer polarity automatic verification device according to claim 1, characterized in that: The host unit further includes a host clock synchronization module, and the slave unit further includes a slave clock synchronization module. The host clock synchronization module and the slave clock synchronization module are used to maintain synchronization of data transmission.

4. The current transformer polarity automatic verification device according to claim 1, characterized in that: The host also includes an output voltage adjustment module, which is used to perform polarity verification of current transformers of different types of primary devices by adjusting the output pulse voltage amplitude.

5. The current transformer polarity automatic verification device according to claim 1, characterized in that: The slave unit also includes a slave interaction interface, which is used to synchronize the polarity check result of the host unit to the slave unit for display, and the host communication module and the slave communication module are 5G communication modules.

6. A method for automatically checking the polarity of a current transformer, based on the device for automatically checking the polarity of a current transformer according to any one of claims 1 to 5, characterized in that: The following steps are included: S1, a pulse voltage generator of the host unit generates a positive pulse current, which flows into the primary side P1 terminal of the current transformer and flows out from the P2 terminal; S2, using a host digital-to-analog conversion module to convert the analog signal of the forward pulse current into a digital signal; S3, the secondary line access port of the slave unit is connected to the secondary line of the current transformer, and the secondary current generated is collected; S4, using the slave analog-to-digital conversion module to convert the collected secondary current analog signal into a digital signal; S5, wirelessly transmitting the digital signal of the secondary current to the host unit through the slave communication module; S6, the logic judgment module receives the secondary current digital signal transmitted by the slave unit, and compares and analyzes it with the digital signal of the forward pulse current generated by the host unit; S7. According to the comparison and analysis results, the logic judgment module judges whether the polarity of the current transformer is correct; S8. If the judgment result indicates that the polarity is incorrect, the host unit prompts the operator to make corrections through the host interactive interface; S9. If the judgment result shows that the polarity is correct, the host unit displays the verification result through the host interactive interface.

7. A method for automatically checking polarity of a current transformer according to claim 6, characterized in that: The following steps are also included: S10, the host unit wirelessly transmits the verification result to the slave unit, and the slave interaction interface of the slave unit synchronously displays the verification result.

8. A method for automatically checking polarity of a current transformer according to claim 6, characterized in that: The following steps are also included: After the pulse voltage generator of the host unit generates a forward pulse current, the host clock synchronization module synchronously records the timestamp of the generated pulse and includes the timestamp information in the digital signal; While the secondary line access port of the slave unit collects the secondary current, the slave clock synchronization module synchronously records the collected timestamp and includes the timestamp information in the digital signal; During the wireless data communication process, the host communication module and the slave communication module use the timestamp information of their respective modules to synchronize and match the data packets so that the transmitted data correspond; When performing comparative analysis, the logic judgment module compares the current amplitude and phase, and also compares the timestamp information, so that the current signals on the primary and secondary sides are consistent in time; If the logic judgment module detects that the timestamp information does not match, it will trigger the synchronization correction process, and resynchronize the data by adjusting the trigger time of the pulse voltage generator through the host unit or adjusting the trigger time of the acquisition through the slave unit; After completing the polarity check, the master unit wirelessly transmits the check result and synchronization status information to the slave unit; After receiving the verification result and synchronization status information, the slave unit displays the verification result and synchronization status information through the slave interactive interface; If the slave unit shows the synchronization status as Out of Sync, adjust the device settings or repeat the calibration process.

9. A method for automatically checking polarity of a current transformer according to claim 6, characterized in that: The following steps are also included: The output voltage regulation module of the host unit automatically adjusts the amplitude of the forward pulse current generated by the pulse voltage generator according to the preset parameters or the type of primary equipment automatically detected, so as to meet the polarity verification requirements of the current transformer of different types of primary equipment; If the logic judgment module finds that the polarity of the current transformer is incorrect after comparative analysis, and determines that the incorrectness is caused by inappropriate amplitude of the primary side pulse voltage, the output voltage regulation module will adjust the output amplitude of the pulse voltage generator according to the feedback signal of the logic judgment module, and re-execute the verification process.

10. A method for automatically checking polarity of a current transformer according to claim 6, characterized in that: The specific steps of step S6 and step S7 include: The logic judgment module receives the secondary current digital signal transmitted by the slave unit through the slave communication module, and the secondary current digital signal includes the amplitude, frequency, phase and timestamp information of the secondary current; The logic judgment module simultaneously obtains the digital signal of the forward pulse current generated by the pulse voltage generator of the host unit, and the digital signal of the forward pulse current also includes the current amplitude, frequency, phase and time stamp information; The logic judgment module pre-processes the two digital signals, including filtering, sampling and normalization, eliminating noise and ensuring signal format consistency; The logic judgment module extracts the key characteristic parameters of two digital signals, including amplitude ratio, phase difference and time delay; The logic judgment module compares the amplitude ratio and phase difference according to the preset polarity verification standard to determine whether the polarity relationship between the primary and secondary currents meets expectations; If the amplitude ratio and phase difference are within the preset threshold range, the logic judgment module further checks the time delay to ensure the time correspondence between the primary and secondary currents; The logic judgment module combines the comparison results of the amplitude ratio, the phase difference and the time delay to draw a conclusion as to whether the polarity of the current transformer is correct or not as a judgment result.

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