Test device and test method for load control terminal

Abstract

The invention discloses a test device and a test method for a load control terminal, and the test device comprises a processing unit which comprises a microprocessor and a field programmable gate array (FPGA) device, and the microprocessor and the FPGA device are in communication through a high-speed bus or are integrated into a system-on-chip (SOC) form; the three-phase voltage and current power amplification module is used for receiving the control signal of the processing unit and outputting a high-voltage voltage signal and a constant current signal; the control and remote signaling interface is provided with a relay output node and an optocoupler switching value input node; the communication module comprises a plurality of interfaces communicated with a load control terminal; the display module comprises an LED display screen and a capacitive touch screen and is used for displaying a graphical interface of an operation system and an operation and display interface of an application program and receiving click or input operation of a user; and the power supply module is used for supplying power to the processing unit and the three-phase voltage and current power amplifier module. According to the invention, comprehensive and accurate detection and function verification of the load control terminal can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a test device and a test method for a load control terminal. Background Art

[0002] With the continuous advancement of power technology and the continuous improvement of industrial automation level, the application of load control management systems and their control terminal equipment in industrial and mining enterprises is becoming more and more extensive, and the proportion of load control systems configured with special transformers has shown a significant growth trend. However, in the current technical field, there is no professional equipment that can comprehensively and accurately detect and verify the functions of load control systems and control terminals.

[0003] Traditional relay protection testers, due to their original design and application scenario limitations, have exposed many deficiencies when facing the detection needs of load control terminal equipment. For example, their AC voltage output capacity is usually only around 130V, which is far from meeting the standard 220V input requirements of load control devices. Even if 57.7V input is used in some specific applications of high-speed measurement, the functional test items that can be carried out are greatly restricted due to the limitations of their output voltage, making it difficult to conduct a comprehensive and effective evaluation and verification of the various performance indicators of the load control device.

[0004] In recent years, although some test instruments have been developed for load control terminals, the functions of these instruments are relatively simple and are often limited to testing the protocol, but they are unable to accurately measure the key performance indicator of the voltage and current sampling accuracy of the load control terminal. As an important basis for power calculation and control of the load control terminal, if the voltage and current sampling accuracy cannot be accurately tested, it will lead to a large deviation in the power error calculation of the terminal itself. In the actual load control process, this power error may cause malfunction during power removal, which will cause serious losses to the production activities of industrial and mining enterprises, such as unexpected shutdown of production equipment, interruption of production processes, and waste of raw materials, which greatly affects the normal production order and economic benefits of the enterprise. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a test device and a test method for a load control terminal to avoid power removal malfunction and production loss and to achieve accurate detection and function verification.

[0006] In order to solve the above technical problems, the present invention provides a test device for a load control terminal, comprising:

[0007] The processing unit includes a microprocessor and a field programmable gate array (FPGA) device, wherein the microprocessor and the FPGA device communicate via a high-speed bus or are integrated into a system-on-chip (SOC) form;

[0008] A three-phase voltage and current amplifier module, used for receiving the control signal of the processing unit and outputting a high voltage signal and a constant current signal;

[0009] Control and remote signaling interface, which has relay output nodes and optocoupler switch input nodes;

[0010] A communication module, which includes a plurality of interfaces for communicating with a load control terminal;

[0011] The display module includes an LED display screen and a capacitive touch screen, which is used to display the graphical interface of the operating system and the operation and display interface of the application program, and receive user clicks or input operations;

[0012] A power supply module is used to supply power to the processing unit and the three-phase voltage and current amplifier module.

[0013] Preferably, the microprocessor comprises an operating memory, a storage device and a peripheral circuit, the operating memory is of DDR3 or DDR4 specification, and the storage device is an EMMC memory.

[0014] Preferably, the control signal output by the processing unit is converted into an analog signal by a digital signal isolation device and a digital-to-analog converter, and then input into the three-phase voltage and current power amplifier module.

[0015] Preferably, the three-phase voltage and current power amplifier module includes a voltage power amplifier circuit and a current power amplifier circuit. The voltage power amplifier circuit uses an operational amplifier to drive a high-voltage MOSFET to achieve voltage signal output, and the feedback loop uses voltage negative feedback; the feedback signal of the current power amplifier circuit is passed through a sampling resistor connected in series in the output loop for current negative feedback to achieve constant current output.

[0016] Preferably, the power supply module includes a charging management unit, and the adapter outputs power to the charging management unit via a power interface. The charging management unit is used to automatically replenish the power of the lithium battery when the power of the lithium battery is insufficient.

[0017] Preferably, the relay output node is used to output control instructions to the load control terminal, and the optocoupler switch input node is used to collect status information of the load control terminal.

[0018] Preferably, the communication module includes at least one of an RS485 interface, an infrared interface, a Bluetooth interface, a wireless public network interface, a USB interface and an Ethernet interface.

[0019] The present invention also provides a method for testing a load control terminal, comprising the following steps:

[0020] Connecting the test device as claimed in claim 1 to a load control terminal to establish a communication link, a telesignaling link, a telemetering link and a voltage and current transmission link between the two;

[0021] Setting output parameters on the operation interface of the test equipment, wherein the output parameters include three-phase rated voltage and current signals or directly set power values;

[0022] The test equipment reads the current transformer ratio information and the primary sampled voltage, current and power values ​​of the load control terminal through the communication interface, converts them into secondary values ​​and compares them with the set output parameters;

[0023] Determine whether the voltage and current sampling of the load control terminal is normal based on the comparison result;

[0024] Monitor the remote control output signal of the load control terminal to determine whether the load control terminal performs the tripping action correctly.

[0025] Preferably, judging whether the voltage and current sampling of the load control terminal are normal based on the comparison result specifically includes:

[0026] If the error is within the preset range, it is judged as normal, otherwise it is judged as abnormal and the wiring condition is checked;

[0027] When the sampling is normal, the test equipment outputs the set load control terminal tripping threshold power or the corresponding voltage and current values.

[0028] Preferably, the determining whether the load control terminal correctly performs the tripping action specifically includes:

[0029] If the tripping action is executed, the load control function is judged to be normal, otherwise check the load control value setting of the load control terminal.

[0030] The implementation of the present invention has the following beneficial effects: the flexible combination of the microprocessor and the FPGA device in the processing unit improves the data processing capability and the accuracy and speed of signal control, and can efficiently simulate a variety of power signal conditions. The three-phase voltage and current amplifier module can accurately output high voltage and constant current signals, provide stable and reliable power output for testing, and meet the testing requirements of different load control terminals. The rich communication interface ensures stable connection and data interaction with the terminal, comprehensively reads and analyzes various parameter information of the terminal, accurately determines whether the voltage, current sampling and load control functions of the terminal are normal, and effectively checks the wiring and control value settings. The accuracy and comprehensiveness of the test are greatly improved, which helps to improve the product quality and performance stability of the load control terminal, ensure the reliable operation of the load control link in the power system, and reduce the risk of power system operation caused by terminal failure. It has important practical value and broad application prospects in the field of power detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

[0032] Figure 1 This is a logic block diagram of a test device for a load control terminal according to an embodiment of the present invention.

[0033] Figure 2 Schematic diagram of the control architecture of the processing unit and the three-phase voltage and current amplifier module in an embodiment of the present invention.

[0034] Figure 3 Schematic diagram of a power supply circuit in an embodiment of the present invention.

[0035] Figure 4 The present invention is a schematic diagram of a test flow of a test device for a load control terminal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following descriptions of the embodiments are with reference to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented. In the description of the present invention, it should be understood that the terms "longitudinal", "length", "circumferential", "front", "rear", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] Please refer to Figure 1 As shown, an embodiment of the present invention provides a test device for a load control terminal, including:

[0038] The processing unit includes a microprocessor and a field programmable gate array (FPGA) device, wherein the microprocessor and the FPGA device communicate via a high-speed bus or are integrated into a system-on-chip (SOC) form;

[0039] A three-phase voltage and current amplifier module, used for receiving the control signal of the processing unit and outputting a high voltage signal and a constant current signal;

[0040] Control and remote signaling interface, which has relay output nodes and optocoupler switch input nodes;

[0041] A communication module, which includes a plurality of interfaces for communicating with a load control terminal;

[0042] The display module includes an LED display screen and a capacitive touch screen, which is used to display the graphical interface of the operating system and the operation and display interface of the application program, and receive user clicks or input operations;

[0043] A power supply module is used to supply power to the processing unit and the three-phase voltage and current amplifier module.

[0044] Specifically, in the embodiment of the present invention, the microprocessor of the processing unit is specifically a high-performance ARM processor, and the ARM processor also includes necessary operation RAM (DDR3 / DDR4) and EMMC memory and necessary peripheral circuits. The EMMC memory is mainly used to store data, etc., such as the data generated and needed to be saved during the operation of the operating system, application program and equipment can be stored therein, and they jointly ensure that the ARM processor can stably and effectively execute various instructions and perform operations such as data processing. From a functional perspective, the operation RAM quickly provides data temporary storage space for the ARM processor during operation, so that the ARM processor can efficiently read and write data to execute program logic. The peripheral circuit is built around the ARM processor, which plays a role in assisting the ARM processor to interact with other modules and external devices, coordinate work, etc. For example, the clock circuit is used to provide a stable clock signal to ensure that the processor works according to a predetermined timing, and the reset circuit is used to reset the processor when necessary to restore it to its initial state.

[0045] ARM processor and FPGA device can be relatively independent chips and peripheral circuits of the two, and ARM and FPGA communicate through high-speed bus. In this case, they are independent individuals on the circuit board, and each is connected and communicated with other circuit modules through its own pins. For example, the ARM processor is connected to the running RAM, EMMC memory and other related control and data lines through its specific pins; FPGA is also connected to the modules that need to interact with it through its own pins, such as data transmission with some input and output interfaces. They communicate with each other through high-speed bus, so that data, instructions and other information can be transmitted quickly, so that the two can work together. For example, the ARM processor can pass some control instructions or data to the FPGA through the high-speed bus, and the FPGA will pass the results or feedback information back to the ARM processor after processing.

[0046] ARM processors and FPGA devices can also be integrated together in the form of SOC. SOC (System on Chip) is a design method that integrates multiple functional modules on a chip. In this way, the ARM processor and FPGA device are integrated into the same SOC chip, such as XILINX's ZYNQ series SOC. In this integrated form, the two have a closer connection and interaction method inside the chip. Compared with the independent chip form, the internal data transmission and collaborative work will be more efficient and convenient, because the communication link between them is optimized and designed inside the chip, which can better meet the needs of some application scenarios with high requirements for real-time and data processing speed. In the entire test equipment, functions such as signal processing and control logic implementation can be completed more efficiently, and together help to realize various test operations on the load control device.

[0047] For example Figure 2 As shown, the processing unit outputs signals for controlling the three-phase voltage and current amplifier module. First, these signals pass through a high-speed digital signal isolation device similar to the principle of photoelectric coupling to effectively electrically isolate the front and rear circuits to avoid electrical interference between each other, such as preventing noise and interference pulses in the front circuit from affecting the rear circuit. At the same time, it can also ensure the safety of the equipment to a certain extent and prevent damage or malfunction caused by electrical faults and other problems.

[0048] The signal after signal isolation is input to the digital-to-analog converter (DAC). The function of the digital-to-analog converter is to convert the control signal in digital form output by the processing unit into the analog signal required by the three-phase voltage and current amplifier module. The analog signal obtained by digital-to-analog conversion is input to the three-phase voltage and current amplifier module. The main function of the three-phase voltage and current amplifier module is to amplify the input analog signal, amplify it to a high-voltage voltage signal and a constant current signal that can meet the test requirements, and then output the high-voltage voltage signal and the constant current signal to act on the object such as the load control terminal being tested, for example, it can provide a suitable high-voltage analog voltage input and constant current input for the load control terminal, so as to detect its various performance indicators under the corresponding voltage and current conditions. It can be understood that when testing the load control terminal, some test items or detection indicators need to provide stable current input conditions. The output of the constant current signal can accurately simulate the current situation under actual working conditions, and then accurately detect the response characteristics, accuracy and other related performance indicators of the load control terminal under different constant current environments, so as to comprehensively evaluate whether the load control terminal meets the requirements.

[0049] More specifically, FPGA devices can generate simulated AC waveform signals according to preset logic, and these signals are first transmitted through digital isolation devices. Digital isolation devices can prevent electrical interference during signal transmission, ensure the purity and stability of the signal, and avoid mutual influence between the previous and next stage circuits. The isolated signal directly controls the digital-to-analog converter (DAC) to convert the digital signal into an analog signal. The amplitude of the signal is controlled by the ARM controller. The FPGA is responsible for generating the basic characteristics of the waveform (such as frequency, phase, etc.), while the ARM controller accurately adjusts the amplitude of the signal according to the system requirements and settings to meet different test scenarios and specific requirements for high-voltage voltage signals.

[0050] The converted analog signal then enters a dedicated high-voltage power amplifier, which uses an operational amplifier to drive a high-voltage MOSFET to achieve the output of a high-voltage signal, which can effectively increase the power of the voltage signal to a high-voltage level that can be used to test the load control terminal. In this process, there is a voltage negative feedback loop, which is used to feed back part of the output high-voltage signal to the input of the amplifier for comparison and adjustment with the input signal. Through continuous monitoring and adjustment, the output high-voltage simulation voltage signal can be more stable and accurate, reduce distortion and errors, ensure the quality and reliability of the test signal, and accurately simulate the high-voltage situation in the actual power system, thereby effectively testing the performance of the load control device under high-voltage environment.

[0051] In addition, the control signal of the power amplifier will also complete the control of the power amplifier output, and the status signals of the power amplifier such as overcurrent, overheating, and voltage imbalance will be fed back to the FPGA. According to these feedback signals, the FPGA adjusts the control strategy of the power amplifier in real time to protect the operation of the power amplifier, prevent damage to the power amplifier components due to abnormal conditions such as overcurrent and overheating, and ensure the safety and stability of the entire test process. Moreover, these status signals will be transmitted to the ARM processor through the FPGA, and the ARM processor will display the alarm information on the display interface after processing, so that the operator can understand the working status of the power amplifier in time and take corresponding measures.

[0052] The preliminary process of the current power amplifier generating analog signals is consistent with that of the voltage power amplifier, that is, the relevant signals are also generated by the FPGA, and the digital-to-analog converter is controlled to output analog signals after passing through the digital isolation device. This ensures the consistency and accuracy of signal generation and facilitates overall control and management.

[0053] In the current power amplifier, the feedback signal is negatively fed back through the sampling resistor connected in series in the output loop. In this way, the amplifier can monitor the output current in real time and compare it with the set current value, and automatically adjust the output signal according to the comparison result to achieve constant current output. This constant current output is very important for testing the performance of the load control device under different constant current conditions. It can simulate the stable current input in actual working conditions, accurately detect the various parameters and response characteristics of the load control device under the constant current environment, and ensure that the test results can truly reflect the current control ability and stability of the load control device in actual applications.

[0054] The control and telesignaling interface is an important channel for interacting, controlling and obtaining relevant status information with the load control terminal. The relay output node is mainly used to output control signals to the outside. When testing the load control terminal, the test equipment needs to simulate various control scenarios in actual operation, such as controlling the switch state of the load control terminal, switching between different functional modes, and the relay output node can provide corresponding electrical control signals to realize these functions. For example, by closing or disconnecting the corresponding circuit through the relay output node, sending instructions such as starting or stopping a functional module or changing its working parameter settings to the load control terminal, the response of the load control terminal to these control instructions and the effect after execution are detected, so as to judge whether the load control terminal meets the requirements in terms of control function. The optocoupler switch input node is mainly responsible for collecting signals in the form of switch quantity from the outside (that is, related equipment such as the load control terminal). The switch quantity signal is a digital signal with only two states (such as open and close, high level and low level). The optocoupler plays the role of isolation and signal conversion here. It can electrically isolate the switch quantity signal from the outside and then transmit it to the inside of the test equipment to ensure the quality of the input signal and avoid external interference from affecting the internal circuit of the test equipment. For example, some status indications of the load control terminal (such as whether it is in a fault state, whether a certain functional module is operating normally, and other information that can be represented by switch quantity) will be collected into the test equipment through the optocoupler switch quantity input node, so that the test equipment can know the real-time operating status of the load control terminal. In general, the relay output node and the optocoupler switch quantity input node in the control and remote signaling interface cooperate with each other, one is used to output control instructions to the load control terminal, and the other is used to collect the status information of the load control terminal, together building an effective information exchange bridge for the test of the load control terminal.

[0055] The communication interface includes interfaces required to communicate with the load control terminal, such as RS485 interface, infrared interface, Bluetooth interface, wireless public network (CDMA / GPRS / 4G) interface, as well as USB interface and Ethernet interface.

[0056] The display module includes an LED display and a capacitive touch screen. The LED display is used to display the graphical interface of the operating system and the operation and display interface of the application. The capacitive touch screen is generally used in handheld devices to replace the keyboard and mouse to complete the user's necessary click or input operations on the displayed content.

[0057] The test equipment of the embodiment of the present invention is powered by a battery, and the power supply module includes a battery charging management circuit to complete the battery charging and discharging management. It also includes 5V and 3.3V power supplies for the processing unit, as well as high-voltage power supplies +400V and -400V required by the three-phase voltage and current amplifier module, and +8V and -8V power supplies required by the current amplifier.

[0058] like Figure 3 As shown, the adapter is an external power supply device, and the power output by it is transmitted to the charging management unit inside the power supply module through the power interface on the test equipment. The adapter outputs the power supply to the charging management unit through the power interface. The charging management unit has an intelligent charging control function and monitors the power status of the lithium battery in real time. When it is detected that the lithium battery is low in power, the charging process will be automatically started, and the power obtained from the adapter will be added to the lithium battery to ensure that the lithium battery can store enough power to maintain the normal use of the detection device in the future. When the power of the lithium battery reaches a relatively sufficient state (that is, the power is greater than 90%), in order to avoid damage to the lithium battery caused by overcharging and affect its service life and performance, the charging management unit will stop charging the lithium battery to ensure that the lithium battery is at a reasonable and safe power level. At the same time, when the power interface is connected to the adapter, the power supply selection is controlled by the charging management unit, and the system V_BUS power supply (V_BUS refers to a power supply bus or power supply line node used for power transmission in the test equipment) is provided by the adapter. The advantage is that as long as the adapter is connected to an external power source, external stable power can be used first to ensure the normal operation of all parts of the system, reducing the consumption of lithium battery power. In addition, the external power source can generally provide a relatively more stable and continuous power supply, which is conducive to the stable operation of the detection device.

[0059] When the test device is not connected to an external adapter, the charging management unit will perform corresponding control switching, so that the power source of the system power supply V_BUS is converted to lithium battery power, so that the lithium battery discharges to provide power for the entire system. In this way, even in the absence of an external adapter, the detection device can still rely on the power stored in its own lithium battery to maintain operation, ensuring that the device has the ability to continue working in different usage scenarios (with or without external power access), improving the flexibility and reliability of the device.

[0060] Through the coordinated working mode between the adapter, charging management unit and lithium battery in different situations, reasonable power supply selection control and charge and discharge management are achieved, ensuring that the detection device can obtain stable power supply regardless of whether it is connected to an external adapter, thereby ensuring the normal operation of the equipment and the rational use of the lithium battery.

[0061] Please refer to Figure 4 As shown, the process of the test equipment of the embodiment of the present invention testing the load control terminal is as follows:

[0062] (1) Equipment connection preparation stage:

[0063] The test equipment of the embodiment of the present invention is physically connected to the load control terminal to be tested to ensure that the communication lines, telesignaling lines, telemetry lines and voltage and current lines between the two are correctly and firmly connected, thereby establishing a reliable physical link foundation for subsequent signal transmission and data interaction.

[0064] (2) Output signal setting stage:

[0065] By setting parameters on the operating software interface of the test equipment, you can choose to output three-phase rated voltage and current signals. This operation is based on the signal generation module inside the test equipment. The module can generate stable and accurate three-phase AC signals according to the preset algorithm and accuracy requirements. The amplitude, frequency and other parameters of these signals can be accurately adjusted to simulate the rated working conditions in the actual power system. At the same time, the software interface also has the function of directly switching to the power output mode. The operator can directly set the power value according to the test requirements. The test equipment will convert the set power value into the corresponding voltage and current signal combination through the internal power calculation and conversion module to achieve the signal output requirements in different test scenarios.

[0066] (3) Data reading and conversion stage:

[0067] The test equipment uses the RS485 communication interface or other compatible communication methods to establish a data communication link with the load control terminal, and reads the ratio information of the current transformer in the load control terminal, as well as the voltage, current and power values ​​sampled once. Subsequently, the test equipment uses the internal high-precision data conversion algorithm based on the acquired current transformer ratio data to convert the primary sampling value into a secondary value, so as to accurately compare it with the output value set by the test equipment itself. During this process, the data processing unit of the test equipment will verify, analyze and convert the read data to ensure the accuracy and consistency of the data. At the same time, data caching and synchronization technology are used to ensure the real-time and integrity of the data, and avoid affecting the accuracy of the test results due to data transmission delays or losses.

[0068] (4) Sampling accuracy judgment stage:

[0069] The error calculation and analysis of the output value set by the test equipment and the converted secondary value of the load control terminal are performed, and the judgment is made through the preset error threshold range. If the error between the two is within the specified allowable range, the voltage and current value sampling function of the load control terminal is determined to be normal, which indicates that the sampling circuit, sensor and related data acquisition and processing module of the load control terminal can accurately collect and transmit power parameter information, meeting the accuracy requirements of normal operation. On the contrary, if the error exceeds the allowable range, the sampling of the load control terminal is considered abnormal. At this time, it is necessary to further check the line connection, including checking whether there are problems such as poor contact, short circuit, open circuit, etc. in the voltage and current lines, and whether the signal transmission of the telemetry line is interfered, etc., to determine whether the sampling error is too large due to abnormal wiring. When the rated value detection is completed and the result is normal, the test equipment will enter the next step, that is, output the set load control terminal tripping threshold power or the corresponding voltage and current value, to prepare for the subsequent load control function test.

[0070] (5) Load control function test phase:

[0071] The test equipment outputs the preset trip threshold power or the corresponding voltage and current values ​​to the load control terminal, and starts the monitoring program for the remote control outlet signal of the load control terminal at the same time. This monitoring program is based on the high-speed signal acquisition and analysis module of the test equipment, which can capture the state changes of the remote control outlet signal of the load control terminal in real time and accurately determine whether it has taken action. In this process, the test equipment will use high-frequency sampling technology and signal filtering algorithms to improve the sensitivity and accuracy of remote control outlet signal monitoring and avoid misjudgment due to signal interference or noise.

[0072] (6) Load control function determination stage:

[0073] According to the monitoring results of the remote control exit signal of the load control terminal, determine whether the load control function of the load control terminal is normal. If the load control terminal correctly implements the tripping action, that is, the remote control exit signal responds and acts in time after receiving the threshold signal output by the test equipment, this indicates that the load control logic, actuators and related control circuits of the load control terminal can work effectively, realize accurate control of the load, and meet the functional requirements of normal operation. Otherwise, it is necessary to further check whether the load control value setting inside the load control terminal is correct, including the setting of the tripping threshold, the configuration of the control parameters, etc., in order to find out the reasons for the abnormal load control function, which may involve software algorithm errors, hardware failures or improper parameter settings, etc., and further diagnosis and debugging methods are needed for in-depth analysis and repair.

[0074] Therefore, corresponding to the test device of a load control terminal in the first embodiment of the present invention, the second embodiment of the present invention provides a test method of a load control terminal, comprising the following steps:

[0075] Connecting the test equipment to the load control terminal to establish a communication link, a telesignaling link, a telemetering link, and a voltage and current transmission link between the two;

[0076] Setting output parameters on the operation interface of the test equipment, wherein the output parameters include three-phase rated voltage and current signals or directly set power values;

[0077] The test equipment reads the current transformer ratio information and the primary sampled voltage, current and power values ​​of the load control terminal through the communication interface, converts them into secondary values ​​and compares them with the set output parameters;

[0078] Determine whether the voltage and current sampling of the load control terminal is normal based on the comparison result;

[0079] Monitor the remote control output signal of the load control terminal to determine whether the load control terminal performs the tripping action correctly.

[0080] Preferably, judging whether the voltage and current sampling of the load control terminal are normal based on the comparison result specifically includes:

[0081] If the error is within the preset range, it is judged as normal, otherwise it is judged as abnormal and the wiring condition is checked;

[0082] When the sampling is normal, the test equipment outputs the set load control terminal tripping threshold power or the corresponding voltage and current values.

[0083] Preferably, the determining whether the load control terminal correctly performs the tripping action specifically includes:

[0084] If the tripping action is executed, the load control function is judged to be normal, otherwise check the load control value setting of the load control terminal.

[0085] For the working principle of this embodiment, please refer to the description of the first embodiment of the present invention, which will not be repeated here.

[0086] Compared with the prior art, the beneficial effect brought by the embodiment of the present invention is that the flexible combination of the microprocessor and the FPGA device in the processing unit improves the data processing capability and the accuracy and speed of signal control, and can efficiently simulate a variety of power signal conditions. The three-phase voltage and current amplifier module can accurately output high voltage and constant current signals, provide stable and reliable power output for testing, and meet the testing requirements of different load control terminals. The rich communication interface ensures stable connection and data interaction with the terminal, comprehensively reads and analyzes various parameter information of the terminal, accurately judges whether the voltage, current sampling and load control functions of the terminal are normal, and effectively checks the wiring and control value settings. The problems greatly improve the accuracy and comprehensiveness of the test, which helps to improve the product quality and performance stability of the load control terminal, ensure the reliable operation of the load control link in the power system, and reduce the risk of power system operation caused by terminal failures. It has important practical value and broad application prospects in the field of power detection.

[0087] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A test device for a load control terminal, characterized in that: include: The processing unit includes a microprocessor and a field programmable gate array (FPGA) device, wherein the microprocessor and the FPGA device communicate via a high-speed bus or are integrated into a system-on-chip (SOC) form; A three-phase voltage and current amplifier module, used for receiving the control signal of the processing unit and outputting a high voltage signal and a constant current signal; Control and remote signaling interface, which has relay output nodes and optocoupler switch input nodes; A communication module, which includes a plurality of interfaces for communicating with a load control terminal; The display module includes an LED display screen and a capacitive touch screen, which is used to display the graphical interface of the operating system and the operation and display interface of the application program, and receive user clicks or input operations; A power supply module is used to supply power to the processing unit and the three-phase voltage and current amplifier module.

2. The test device according to claim 1, characterized in that The microprocessor comprises an operating memory, a storage device and a peripheral circuit, the operating memory is of DDR3 or DDR4 specification, and the storage device is an EMMC memory.

3. The testing device according to claim 1, characterized in that The control signal output by the processing unit is converted into an analog signal by a digital signal isolation device and a digital-to-analog converter, and then input into the three-phase voltage and current power amplifier module.

4. The testing device according to claim 3, characterized in that The three-phase voltage and current power amplifier module includes a voltage power amplifier circuit and a current power amplifier circuit. The voltage power amplifier circuit uses an operational amplifier to drive a high-voltage MOSFET to achieve voltage signal output, and the feedback loop uses voltage negative feedback; the feedback signal of the current power amplifier circuit is passed through a sampling resistor connected in series in the output loop for current negative feedback to achieve constant current output.

5. The testing device according to claim 1, characterized in that The power supply module includes a charging management unit. The adapter outputs power to the charging management unit via a power interface. The charging management unit is used to automatically replenish the power of the lithium battery when the lithium battery is low on power.

6. The testing device according to claim 1, characterized in that The relay output node is used to output control instructions to the load control terminal, and the optocoupler switch input node is used to collect status information of the load control terminal.

7. The testing device according to claim 1, characterized in that The communication module includes at least one of an RS485 interface, an infrared interface, a Bluetooth interface, a wireless public network interface, a USB interface and an Ethernet interface.

8. A method for testing a load control terminal, characterized in that: The following steps are involved: Connecting the test device as claimed in claim 1 to a load control terminal to establish a communication link, a telesignaling link, a telemetering link and a voltage and current transmission link between the two; Setting output parameters on the operation interface of the test equipment, wherein the output parameters include three-phase rated voltage and current signals or directly set power values; The test equipment reads the current transformer ratio information and the primary sampled voltage, current and power values ​​of the load control terminal through the communication interface, converts them into secondary values ​​and compares them with the set output parameters; Determine whether the voltage and current sampling of the load control terminal is normal based on the comparison result; Monitor the remote control output signal of the load control terminal to determine whether the load control terminal performs the tripping action correctly.

9. The testing method according to claim 8, characterized in that: The step of judging whether the voltage and current sampling of the load control terminal are normal based on the comparison result specifically includes: If the error is within the preset range, it is judged as normal, otherwise it is judged as abnormal and the wiring condition is checked; When the sampling is normal, the test equipment outputs the set load control terminal tripping threshold power or the corresponding voltage and current values.

10. The testing method according to claim 8, characterized in that: The step of judging whether the load control terminal correctly performs the tripping action specifically includes: If the tripping action is executed, the load control function is judged to be normal, otherwise check the load control value setting of the load control terminal.

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