Digital-analog integrated relay protection testing device

Abstract

The invention discloses a digital-analog integrated relay protection testing device, which comprises a main control core board module, a digital-analog integrated relay protection testing module, a digital-analog integrated relay protection testing module, a digital-analog integrated relay protection testing module and a digital-analog integrated relay protection testing module, the signal chain module is used for converting a calculation result of the microprocessor into an analog quantity according to the digital-to-analog converter and carrying out operational amplification according to the analog quantity; the physical layer network card module is used for data interaction and message transceiving between the digital-analog integrated relay protection testing device and external equipment; the Bluetooth transceiver module is used for carrying out data interaction with external Bluetooth equipment and realizing remote control and data sharing; the storage module is used for storing test programs, configuration files and test data. Based on the technical scheme, the performance of the testing device is improved, the localization autonomous controllable capability is enhanced, the testing device is suitable for various transformer substation testing scenes, and the accuracy and efficiency of relay protection testing are improved.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a digital-analog integrated relay protection test device. Background Art

[0002] Relay protection devices play a vital role in ensuring the safe operation of power systems. Once a fault occurs in the system, the relay protection device must be able to quickly and accurately give an alarm signal, automatically cut off the fault, and minimize or reduce the damage and impact of the fault on the operating equipment in the system.

[0003] In order to ensure the correctness and reliability of the relay protection device during long-term operation, various tests must be carried out in a targeted manner at different stages of the device's research and development, production, installation, and operation. The basic tool used to perform such tests is the relay protection test device.

[0004] However, traditional relay protection test devices have failed to fully tap the potential of the combination of software and hardware. When dealing with relay protection test tasks with high precision and high real-time requirements, the overall performance improvement encounters bottlenecks and it is difficult to achieve an efficient collaborative working mode. As a result, in actual applications, the relay protection test device may not be able to detect fault hazards in the power system in a timely and accurate manner, affecting the safe and stable operation of the power grid. At the same time, the maintenance and upgrade of the equipment also face many difficulties, high costs and low efficiency. Summary of the invention

[0005] The present invention provides a digital-analog integrated relay protection test device to improve the localization level and overall performance of power test equipment and better ensure the safe and stable operation of the power system.

[0006] According to one aspect of the present invention, a digital-analog integrated relay protection test device is provided, wherein the device comprises: a main control core board module, a signal chain module, a physical layer network card module, a Bluetooth transceiver module and a storage module; wherein,

[0007] The main control core board module is composed of a microprocessor and a programmable logic gate array, the microprocessor is used to process non-real-time tasks, and the programmable logic gate array is used for real-time message reception and transmission and switch quantity collection;

[0008] The signal chain module is used to convert the calculation result of the microprocessor into an analog quantity according to the digital-to-analog converter, and perform operational amplification according to the analog quantity;

[0009] The physical layer network card module is used for data interaction and message reception and transmission between the digital-analog integrated relay protection test device and external equipment;

[0010] The Bluetooth transceiver module is used to interact with external Bluetooth devices and realize remote control and data sharing;

[0011] The storage module is used to store test programs, configuration files and test data.

[0012] In one embodiment, the device further comprises: a software system; wherein,

[0013] The software system adopts an asymmetric processing architecture to achieve collaborative work between software and hardware and improve the overall performance of the test device. The software system is composed of a combination of Linux and RTOS operating systems.

[0014] In one embodiment, the device further comprises: a time synchronization module and a human-computer interaction module; wherein,

[0015] The timing module is used to achieve accurate synchronization between the test device and the external clock according to the Beidou timing unit;

[0016] The human-computer interaction module is used to display test parameters, device status and test results to achieve human-computer interaction.

[0017] In one embodiment, the device further includes: a power amplifier module, which uses a deep negative feedback technology to control a power amplifier to output a high-power test signal.

[0018] In one embodiment, the software system of the power amplifier module accurately adjusts the output parameters of the power amplifier module according to the test requirements and monitors the power amplifier status in real time.

[0019] In one embodiment, the software system in the signal chain module sets the conversion parameters of the digital-to-analog converter through a precise control algorithm, monitors the working status of the signal chain module in real time, and adjusts the control algorithm according to hardware feedback to ensure the accuracy and stability of the output signal.

[0020] In one embodiment, the software system of the human-computer interaction module uses the Linux QT development tool to design a graphical user interface to implement test parameter setting, device status display and test result presentation functions.

[0021] In one embodiment, the software system of the storage module is responsible for data storage management, optimal allocation of memory resources, and ensuring data security and smooth operation.

[0022] In one embodiment, the software system includes a test platform layer, a device control layer, and a hardware process layer, and the layers communicate and collaborate through standardized interfaces to achieve a flexible architecture and efficient operation of the software system.

[0023] In one embodiment, the software system of the Bluetooth transceiver module implements data interaction, connection management and security authentication functions with external Bluetooth devices, expanding the wireless communication path of the test device.

[0024] The technical solution of the embodiment of the present invention includes: a main control core board module, a signal chain module, a physical layer network card module, a Bluetooth transceiver module and a storage module. The main control core board module is composed of a microprocessor and a programmable logic gate array. The microprocessor is used to process non-real-time tasks, and the programmable logic gate array is used for real-time message transmission and reception and switch quantity acquisition; the signal chain module is used to convert the calculation result of the microprocessor into an analog quantity according to the digital-to-analog converter, and perform operational amplifier according to the analog quantity; the physical layer network card module is used for data interaction and message transmission and reception between the digital-to-analog integrated relay protection test device and external devices; the Bluetooth transceiver module is used for data interaction with external Bluetooth devices, and realizes remote control and data sharing; the storage module is used to store test programs, configuration files and test data. Based on the above technical solution, the performance of the test device is improved and the domestic independent controllable capability is enhanced. It is suitable for a variety of substation test scenarios and improves the accuracy and efficiency of relay protection testing.

[0025] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a structural diagram of a digital-analog integrated relay protection test device provided by an embodiment of the present invention;

[0028] Figure 2 It is an architecture diagram of Rockchip RK3568 provided by an embodiment of the present invention; DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] Embodiment 1

[0032] Figure 1 The structure diagram of a digital-analog integrated relay protection test device provided by an embodiment of the present invention. Figure 1 As shown, the device includes: a main control core board module, a signal chain module, a physical layer network card module, a Bluetooth transceiver module and a storage module; wherein,

[0033] The main control core board module is composed of a microprocessor and a programmable logic gate array, the microprocessor is used to process non-real-time tasks, and the programmable logic gate array is used for real-time message reception and transmission and switch quantity collection; the signal chain module is used to convert the calculation result of the microprocessor into an analog quantity according to the digital-to-analog converter, and perform operational amplifier according to the analog quantity; the physical layer network card module is used for data interaction and message reception and transmission between the digital-to-analog integrated relay protection test device and external equipment; the Bluetooth transceiver module is used for data interaction with external Bluetooth devices and realize remote control and data sharing; the storage module is used to store test programs, configuration files and test data.

[0034] Among them, the hardware in the physical layer network card module is responsible for the data transmission and reception of the physical layer, and the software is responsible for protocol processing and communication control. It is based on the YT8521 network card and is used for data interaction between external computers and instruments and the transmission and reception of various messages; the network communication module in the software system works together with the network card, and is used for various communication protocols including but not limited to IEC61850-9-1, IEC61850-9-2, and GOOSE. Through precise protocol stacks, stable data transmission is achieved, and network status monitoring and adaptive adjustment are performed at the same time, so that the test device can communicate reliably in a complex network environment, and the software system can also optimize the data transmission strategy according to the network communication situation to improve communication efficiency. The collaboration of software and hardware ensures the stability and efficiency of network communication.

[0035] It should be noted that if Figure 1As shown in the figure, before the smart substation is put into operation, it is necessary to conduct a comprehensive test on the relay protection device in the station to ensure that it can operate accurately under various working conditions and ensure the safe and stable operation of the substation. The test content covers multiple aspects such as the fixed value verification of the protection device, the action characteristic test, the communication function test, the sampling accuracy test, and the anti-interference ability test. The test device is required to accurately simulate various complex fault conditions and output high-precision voltage and current analog signals. Its output range and accuracy must meet the strict requirements of the relay protection device of the smart substation. At the same time, the test device should have a variety of communication protocols to achieve stable communication with protection devices of different manufacturers and models and to accurately monitor and analyze the communication data. In addition, the test device must have efficient data processing capabilities, be able to quickly process a large amount of test data, and accurately judge whether the performance of the protection device meets the standards.

[0036] Specifically, the main control core board module is an ARM processor based on the Rockchip RK3568 architecture and a Unigroup Tongchuang FPGA that works in collaboration. Figure 2 As shown in the figure, RK3568 uses its powerful processing power to run the Linux operating system to process non-real-time tasks such as calculation and analysis of test data, such as calculating accurate voltage and current output parameters according to the type of protection device and test requirements (such as in the three-phase short-circuit fault simulation test, the calculated voltage of phase A is 0V and the current is 10A; the voltage of phase B is 0V and the current is 10A; the voltage of phase C is 0V and the current is 10A). At the same time, another core runs RTOS to be responsible for the control operation of the real-time part, such as real-time monitoring of hardware status and timely response. FPGA is responsible for converting the ARM calculation results into a suitable protocol format, forwarding data, realizing communication with the protection device and accurately collecting the switch signal of the protection device. When testing the action characteristics of the protection device, FPGA converts the simulated fault signal data calculated by ARM into a message format that the protection device can recognize and sends it out, and quickly receives the action signal of the protection device and feeds it back to ARM for judgment. The response time of the whole process is less than 100μs.

[0037] Since traditional substations may have multiple old communication protocols, the YT8521 network card in the physical layer network card module, in collaboration with the network communication module of the software system, achieves compatibility with different communication protocols through a precise protocol stack. When testing the communication with the original equipment in the station, the test device sends and receives messages that comply with traditional communication protocols (such as IEC60044-8, etc.) through the network card to ensure the stability of data transmission. The test device sends test messages to the merging unit in the station and receives the data returned by the merging unit. After multiple tests, the bit error rate of data transmission is less than 1×10 -6, ensuring the reliability of communication. When conducting communication compatibility tests, the test device communicates with devices of different manufacturers and models in the station in turn, and the success rate of successfully establishing connections and stabilizing communications reaches more than 99%. During data transmission, the network communication module of the software system can automatically adjust the transmission rate according to the network load to ensure the stability and efficiency of data transmission.

[0038] During the test, the EMMC FLASH of the storage unit stores a large amount of test data, including voltage and current output values ​​under different test items, feedback signals of protection devices, test time and other information. DDR4 RAM provides sufficient memory space for system operation to ensure that the software system can process data quickly. During a complete protection device test, the storage unit stores nearly 100MB of test data. The software system can quickly read and write data from the storage unit to ensure the smoothness of the test process. After the test, the tester can easily export the test data stored in the EMMC FLASH to an external storage device, such as a USB flash drive, through the human-machine interface. The data export speed can reach more than 10MB / s, which is convenient for subsequent in-depth analysis and archiving of the test data.

[0039] Before the test begins, the tester initializes the test device through the human-machine interface display touch screen module, including selecting the type of protection device to be tested, the communication protocol, etc. Then the test is started, and the main control core board unit module outputs the simulated voltage and current signals according to the setting control signal chain module (such as simulating the three-phase voltage and current signals during normal operation, the three-phase voltage is 100V, and the current is 5A) and establishes a communication connection with other devices in the station through the physical layer network card PHY module. After receiving the analog signal, the new protection device processes it, and its action signal and status information are fed back to the test device through the network card. The main control core board unit module of the test device analyzes and judges the performance of the protection device in combination with the time mark provided by the GPS / Beidou timing unit. During the entire test process, the Bluetooth transceiver module facilitates the test personnel to remotely monitor and operate the test data. After a series of tests, the sampling accuracy of the new protection device reached within 0.1%, the protection logic was correct, and the communication with other equipment in the station was stable and reliable. It cooperated well with the original fault recording equipment and could accurately record when a simulated fault occurred with precise time synchronization. It met the requirements for upgrading and renovation of traditional substations, and the modules of the test device worked well together during the test, providing strong support for the renovation of traditional substations.

[0040] On the basis of the above technical solution, the device also includes: a software system; wherein, the software system adopts an asymmetric processing architecture to achieve collaborative work between software and hardware and improve the overall performance of the test device, and the software system is composed of a combination of Linux and RTOS operating systems.

[0041] Specifically, the main control core board unit module is composed of an ARM processor based on the RK3568 architecture and an FPGA. The RK3568 uses a 22nm advanced process technology and integrates a 4-core ARM architecture A55 processor and a Mali G522EE graphics processor, which are used for including but not limited to 4K decoding, 1080P encoding and a variety of peripheral interfaces. The FPGA is responsible for protocol conversion, data forwarding, real-time message transmission and reception, and switch quantity acquisition. The software system includes the operating system and application programs of all modules. The operating system uses Linux+RTOS. Linux is used to process non-real-time tasks, and RTOS is responsible for the control calculation of the real-time part. The two interact with data through shared memory and message queues. The various functions of the test device and user interaction functions are completed through the application program and work in coordination with the hardware modules. High-precision test signal output, fast data processing and communication, and stable equipment operation are achieved through the coordination of software and hardware.

[0042] The signal chain module uses ZJC2542-18 as DAC, converts the ARM calculation results into analog quantities and cooperates with the ZJA1000Z series precision voltage reference source and ZJA3000 op amp; the application in the software system sets the conversion parameters of the DAC through precise control algorithms, and uses the high precision and low noise characteristics of the reference source to achieve high-precision digital-to-analog conversion. The analog signal is converted and filtered through the op amp, allowing the analog signal to be used in different relay protection devices. At the same time, the software system monitors the working status of the signal chain module in real time and adjusts the control algorithm according to hardware feedback to improve the accuracy and stability of signal processing, thereby achieving close coordination between the software algorithm and the hardware signal chain module.

[0043] For example, the powerful computing power of the RK3568 processor is fully utilized. In the R&D test, the Linux system is responsible for running complex data analysis and processing programs, such as simulation calculations of new protection device algorithms, and processing data exchange tasks with external devices (such as computers, servers, etc.). RTOS focuses on real-time control tasks, such as real-time monitoring of hardware status and close cooperation with FPGA to ensure fast processing and transmission of data. When testing new protection algorithms, the Linux system calculates the theoretical voltage and current output curves based on the algorithm model, and then passes the relevant parameters to RTOS. RTOS controls FPGA to convert these parameters into actual analog output signals and receives feedback signals from the protection device in real time and passes them to the Linux system for comparative analysis. In this process, FPGA undertakes high-speed data conversion and transmission tasks, quickly converting the ARM calculation results into analog outputs for the protection device and transmitting the response signals of the protection device back to the ARM processor in a timely manner.

[0044] And in order to meet the demand for high-precision signals in R&D tests, the ZJC2542-18 DAC of the signal chain module can achieve the output of tiny voltage and current changes under the precise control of the software system (such as the output voltage resolution can reach 0.1mV, and the current resolution can reach 0.1mA). The ZJA1000Z precision voltage reference source provides a stable reference voltage for the DAC, ensuring the high precision of the digital-to-analog conversion. The ZJA3000 op amp finely conditions the analog signal to meet the stringent requirements of the new protection device for the input signal. During the test, the software system dynamically adjusts the conversion parameters of the DAC according to different test scenarios. When testing the protection device's ability to detect weak fault signals, the software system controls the DAC to output tiny analog fault signals (such as outputting a 0.1V voltage change signal) and monitors the quality of the op amp output signal in real time to ensure the accuracy and stability of the signal.

[0045] Researchers interact with the test device through the 10.1-inch LCD screen and touch screen in the human-computer interaction module. Using the graphical user interface, researchers can easily design complex test plans, such as setting different fault type combinations, adjusting the frequency and phase change rules of the test signal, etc. When testing the action characteristics of the protection device under complex fault conditions, researchers use the touch screen to set the three-phase voltage to change according to different function rules (such as the A phase voltage changes according to a sine wave, the B phase voltage changes according to a square wave, and the C phase voltage changes according to a triangle wave). At the same time, they can view the graphical display of the test results in real time (such as the relationship curve between the action time of the protection device and the input signal) to adjust the test parameters and analyze the test results in time.

[0046] In scientific research and testing, it is necessary to communicate with a variety of R&D equipment and test systems. With the support of the network communication module of the software system, the YT8521 network card realizes stable and high-speed data transmission between different devices. The test device is connected to the simulation server through the network card, receives the simulated power grid operation data sent by the server, and then adjusts the output test signal according to these data, and feeds back the test results of the protection device to the server for further analysis. During the data transmission process, the network communication module of the software system optimizes the data transmission strategy to ensure the fast and accurate transmission of large amounts of test data (such as several GB of data generated in each test), and the data transmission rate can reach more than 100Mbps.

[0047] On the basis of the above technical solution, the device also includes: a time synchronization module and a human-computer interaction module; wherein the time synchronization module is used to realize accurate synchronization of the test device with an external clock according to the Beidou time synchronization unit; the human-computer interaction module is used to display test parameters, equipment status and test results to realize human-computer interaction.

[0048] Among them, the timing module is equipped with a SKG172T GPS / Beidou timing unit module, which is used to provide high-precision 1PPS second pulse signal and PVT information output; the clock management module in the software system cooperates with the timing unit to achieve accurate synchronization between the test device and the external clock, and uses software algorithms combined with hardware clock resources to maintain high-precision timekeeping when the synchronization signal is lost, so that the time of the relay protection test remains accurate. At the same time, the software system can time-mark the test data according to the timing information to facilitate data analysis and processing.

[0049] Specifically, the SKG172T timing unit in the timing module provides an accurate time reference for the test device, and the clock management module of the software system uses this time reference to accurately mark the time of each event in the test process. When testing the action time of the protection device, the test device records the time interval from the protection device receiving the simulated fault signal to issuing the action command, and compares it with the precise time provided by the GPS / Beidou timing unit to ensure that the accuracy of the action time measurement is within ±1ms. In a phase-to-phase short circuit simulation test, the time from the protection device receiving the fault signal to the tripping action was accurately recorded as 35ms, meeting the performance requirements of the protection device. When conducting collaborative testing with the original fault recording equipment in the station, the GPS / Beidou timing unit ensures that the time of the test device and the fault recording equipment is synchronized, with an error of less than 10μs, so that when the simulated fault occurs, the recording data of the new protection device and the record of the fault recording equipment can accurately correspond in time, which is convenient for the subsequent analysis of the fault process and the search for the cause of the fault.

[0050] On the basis of the above technical solution, the device further comprises: a power amplifier module, which uses deep negative feedback technology to control the power amplifier to output a high-power test signal.

[0051] The software system of the power amplifier module accurately adjusts the output parameters of the power amplifier module according to the test requirements and monitors the power amplifier status in real time.

[0052] Among them, the hardware in the power amplifier module performs power amplification tasks, and the software is responsible for control and monitoring. Specifically: a Class AB power amplifier combined with deep negative feedback technology is used, the output frequency range is DC to 2500Hz, and the 50Hz industrial frequency output accuracy can reach within 0.1%; the power control application in the software system accurately adjusts the output parameters of the power amplifier module according to test requirements, including but not limited to power, frequency, and phase; at the same time, the power amplifier status is monitored in real time and abnormal conditions such as overload and overheating are prevented through a software protection mechanism, so that the power amplifier module can work stably and efficiently, and the software system can optimize the power output algorithm according to the performance characteristics of the power amplifier module, improve the power conversion efficiency, and achieve efficient and accurate power amplification through the collaboration of software and hardware.

[0053] Specifically, the class AB power amplifier in the power amplifier module outputs a stable power signal according to the test requirements under the power control of the software system. When the test needs to simulate a high-power fault current (such as simulating a 10A current output during a three-phase short circuit), the software system accurately adjusts the output parameters of the power amplifier module while monitoring the temperature, current and other states of the power amplifier module. If the temperature of the power amplifier module rises above the set value (such as 70°C), the software system will automatically reduce the output power or start the cooling fan to prevent damage to the power amplifier module, ensuring the stable operation of the power amplifier module during the test. When conducting a long-term high-power output test, such as continuously outputting a 10A current for 30 minutes, the temperature of the power amplifier module is always kept within a safe range, and the stability of the output current is better than ±0.5%, meeting the test requirements.

[0054] Based on the above technical solution, the software system in the signal chain module sets the conversion parameters of the digital-to-analog converter through a precise control algorithm, monitors the working status of the signal chain module in real time, and adjusts the control algorithm according to hardware feedback to ensure the accuracy and stability of the output signal.

[0055] Among them, the signal chain module uses ZJC2542-18 as DAC, converts the ARM calculation results into analog quantities and cooperates with the ZJA1000Z series precision voltage reference source and ZJA3000 op amp; the application in the software system sets the conversion parameters of the DAC through a precise control algorithm, and uses the high precision and low noise characteristics of the reference source to achieve high-precision digital-to-analog conversion. The analog signal is converted and filtered through the op amp, so that the analog signal can be used in different relay protection devices. At the same time, the software system monitors the working status of the signal chain module in real time and adjusts the control algorithm according to hardware feedback to improve the accuracy and stability of signal processing, and realize the close coordination of the software algorithm and the hardware signal chain module.

[0056] Specifically, when the signal chain module tests the sampling accuracy of the protection device, the ZJC2542-18 DAC converts the digital quantity into an analog voltage signal (such as outputting different voltage values ​​in the range of 0-100V) under the precise control of the software system. The ZJA1000Z reference source ensures the high accuracy of the voltage reference, and the ZJA3000 op amp conditions the signal so that the total harmonic distortion rate of the output signal is less than 0.2%. The software system monitors the quality of the output signal of the signal chain module in real time. If the signal distortion exceeds the set threshold (such as 0.3%), the op amp parameters are adjusted or the DAC conversion settings are checked to ensure that the output signal meets the test requirements. When performing a small signal output test, the software system precisely controls the conversion parameters of the DAC to ensure that the output voltage signal is accurate within ±2mV in the range of 0-2V. During the test, when simulating voltage signals of different amplitudes, the software system dynamically adjusts the output of the DAC according to the target amplitude. For example, when switching from outputting 5V voltage to outputting 50V voltage, the adjustment time is less than 10ms, and the accuracy of the output voltage is always maintained within ±0.2%.

[0057] On the basis of the above technical solution, the software system of the human-computer interaction module uses the Linux QT development tool to design a graphical user interface to realize the test parameter setting, equipment status display and test result presentation functions.

[0058] Specifically, the human-computer interaction module allows the tester to view the status information of the test equipment (such as the current output voltage and current value, device temperature, etc.) and operation prompts through the 10.1-inch LCD screen and touch screen. Using the graphical user interface, the tester can easily select different test functions (such as simulating different types of faults, such as phase-to-phase short circuit, ground fault, etc.) and adjust the test parameters according to the test requirements (such as changing the frequency and phase of the output current). When performing a ground fault simulation test, the tester sets the fault type to single-phase grounding through the touch screen, and then adjusts the grounding resistance value (such as setting it to 10Ω). The interface will display the set parameters in real time and prompt the tester to proceed to the next step. At the same time, if there is an abnormality in the communication between the test device and the protection device during the test, the interface will display the communication fault information and possible causes, which is convenient for the tester to troubleshoot the problem. When the communication between the test device and the new protection device is interrupted, the interface will immediately prompt "Communication interruption, please check the connection line or device settings", and give common reasons that may cause communication interruption, such as loose communication interface, mismatch of communication protocol, etc.

[0059] Exemplarily, in the human-computer interaction module, the hardware is responsible for the physical presentation of the display content, and the software is responsible for the interface logic and data interaction, specifically: a 10.1-inch LCD screen and a domestic touch screen are used with a wide operating temperature range; the software system uses the Linux QT development tool to design a graphical user interface, and collaborates with the display touch screen for human-computer interaction, including but not limited to test parameter setting, equipment status display, and test result presentation functions. The interface layout and operation process are optimized and designed according to the user experience. At the same time, the software system controls the hardware module to perform corresponding actions according to the user's operating instructions and updates the display content in real time, providing users with a convenient and efficient operation experience through the collaboration of software and hardware.

[0060] On the basis of the above technical solution, the software system of the storage module is responsible for data storage management and optimal allocation of memory resources to ensure data security and smooth operation.

[0061] Specifically, the hardware in the storage module provides physical storage media, and the software is responsible for storage management and data read and write control, including: 2 EMMC FLASH chips integrated on the core board and 2 standard replaceable domestic DDR4 chips as RAM; during the startup process of the software system, the U-Boot boot program is responsible for initializing the hardware and loading the kernel, and loading the file system and application after the kernel is started, so that the entire process is optimized to ensure fast and stable startup. At the same time, the software system manages, updates and backs up FLASH data, and efficiently manages and optimizes the allocation of RAM memory resources to ensure system data security and smooth operation, and the storage system operates efficiently and reliably through the collaboration of software and hardware.

[0062] On the basis of the above technical solution, the software system includes a test platform layer, a device control layer and a hardware process layer. The layers communicate and collaborate through standardized interfaces to achieve a flexible architecture and efficient operation of the software system.

[0063] Specifically, the software system adopts a three-layer architecture design, and each layer communicates and collaborates through standardized interfaces: the test platform layer includes test template development and automatic test operation platform, the device control layer drives peripheral hardware devices, and the hardware process layer directly operates the hardware; the software system is modularly designed according to hardware resources and test requirements and flexibly expands functional modules according to actual operating conditions, so as to customize test plans for different relay protection devices and improve the versatility and adaptability of the test device; at the same time, the software system monitors the usage of hardware resources in real time during operation, dynamically adjusts task allocation and execution strategies according to resource occupancy, and improves the overall performance of the system; the flexible architecture and efficient operation of the system are achieved through the collaboration of software and hardware. The hardware provides basic computing and operation capabilities, and the software is responsible for the system System logic and function realization; during the operation of the digital-analog integrated relay protection test device, the software system and the hardware system continuously exchange data and work together; when the status of the hardware module changes, including but not limited to temperature increase and abnormal signal changes, the hardware notifies the software system through interrupts and status registers, and the software system responds in a timely manner and takes corresponding measures, including but not limited to adjusting working parameters and issuing alarm information. At the same time, when the software system executes the test task, it sends control instructions to the hardware module according to the test requirements. The hardware module accurately executes the instructions and feeds back the execution results to the software system. Through the above process, close cooperation and efficient collaboration between software and hardware are achieved, so that the test device can operate stably and reliably under various working conditions, and the accuracy and efficiency of relay protection testing are improved.

[0064] On the basis of the above technical solution, the software system of the Bluetooth transceiver module realizes data interaction, connection management and security authentication functions with external Bluetooth devices, and expands the wireless communication path of the test device.

[0065] Among them, the hardware in the Bluetooth transceiver module is responsible for sending and receiving wireless signals, and the software is responsible for the Bluetooth protocol stack and application logic. It has a Bluetooth transceiver module SWYL-BT12 with a built-in Arm Cortex core for master-slave integration and custom protocols; the Bluetooth communication application program in the software system implements functions including but not limited to data interaction with external Bluetooth devices, connection management and security authentication functions, expands the wireless communication channels of the test equipment, and facilitates users to perform remote control and data sharing operations. At the same time, the software system also optimizes Bluetooth communication parameters according to the connection status and data transmission requirements of the Bluetooth device to ensure communication quality, and realizes stable and reliable operation of the Bluetooth function through the collaboration of software and hardware.

[0066] Specifically, during the test of the Bluetooth transceiver module, the Bluetooth transceiver module SWYL-BT12 can be connected to the tester's mobile device (such as a tablet computer). The Bluetooth communication application in the software system realizes data interaction with the tablet computer. The tester can view detailed test data reports on the tablet computer (such as voltage and current waveform records under different test items, protection device action times statistics, etc.), and can also remotely control some functions of the test device through the tablet computer (such as starting or pausing the test, adjusting the amplitude of the output signal, etc.). The tester remotely started a new protection logic verification test through the tablet computer at a distance of 10 meters from the test device, and viewed various data during the test in real time. During the test, the Bluetooth connection was stable, and the data transmission delay was less than 500ms. The tester could smoothly operate the tablet computer to control the test device and obtain accurate test data in a timely manner.

[0067] The technical solution of the embodiment of the present invention includes: a main control core board module, a signal chain module, a physical layer network card module, a Bluetooth transceiver module and a storage module. The main control core board module is composed of a microprocessor and a programmable logic gate array. The microprocessor is used to process non-real-time tasks, and the programmable logic gate array is used for real-time message transmission and reception and switch quantity acquisition; the signal chain module is used to convert the calculation result of the microprocessor into an analog quantity according to the digital-to-analog converter, and perform operational amplifier according to the analog quantity; the physical layer network card module is used for data interaction and message transmission and reception between the digital-to-analog integrated relay protection test device and external devices; the Bluetooth transceiver module is used for data interaction with external Bluetooth devices, and realizes remote control and data sharing; the storage module is used to store test programs, configuration files and test data. Based on the above technical solution, the performance of the test device is improved, which is suitable for a variety of substation test scenarios and improves the accuracy and efficiency of relay protection testing.

[0068] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0069] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A digital-analog integrated relay protection test device, characterized in that: The device comprises: a main control core board module, a signal chain module, a physical layer network card module, a Bluetooth transceiver module and a storage module; wherein, The main control core board module is composed of a microprocessor and a programmable logic gate array, the microprocessor is used to process non-real-time tasks, and the programmable logic gate array is used for real-time message reception and transmission and switch quantity collection; The signal chain module is used to convert the calculation result of the microprocessor into an analog quantity according to the digital-to-analog converter, and perform operational amplification according to the analog quantity; The physical layer network card module is used for data interaction and message reception and transmission between the digital-analog integrated relay protection test device and external equipment; The Bluetooth transceiver module is used to interact with external Bluetooth devices and realize remote control and data sharing; The storage module is used to store test programs, configuration files and test data.

2. The device according to claim 1, characterized in that Also includes: Software system; among which, The software system adopts an asymmetric processing architecture to achieve collaborative work between software and hardware and improve the overall performance of the test device. The software system is composed of a combination of Linux and RTOS operating systems.

3. The device according to claim 1, characterized in that Also includes: Timing module and human-computer interaction module; among them, The timing module is used to achieve accurate synchronization between the test device and the external clock according to the Beidou timing unit; The human-computer interaction module is used to display test parameters, device status and test results to achieve human-computer interaction.

4. The device according to claim 1, characterized in that Also includes: The power amplifier module uses deep negative feedback technology to control the power amplifier and is used to output high-power test signals.

5. The device according to claim 4, characterized in that The software system of the power amplifier module accurately adjusts the output parameters of the power amplifier module according to the test requirements and monitors the power amplifier status in real time.

6. The device according to claim 1, characterized in that The software system in the signal chain module sets the conversion parameters of the digital-to-analog converter through a precise control algorithm, monitors the working status of the signal chain module in real time, and adjusts the control algorithm according to hardware feedback to ensure the accuracy and stability of the output signal.

7. The device according to claim 3, characterized in that The software system of the human-computer interaction module uses the LinuxQT development tool to design a graphical user interface to achieve test parameter setting, device status display and test result presentation functions.

8. The device according to claim 1, characterized in that The software system of the storage module is responsible for data storage management, optimal allocation of memory resources, and ensuring data security and smooth operation.

9. The device according to claim 1, characterized in that The software system includes a test platform layer, a device control layer and a hardware process layer. The layers communicate and collaborate through standardized interfaces to achieve a flexible architecture and efficient operation of the software system.

10. The device according to claim 1, characterized in that The software system of the Bluetooth transceiver module realizes data interaction, connection management and security authentication functions with external Bluetooth devices, and expands the wireless communication path of the test device.

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