A power distribution automation terminal checking device and method

Abstract

The application relates to a power distribution automation terminal checking device and method. The device comprises a trigger display module, which triggers and generates a trigger signal according to test requirements; an analog switch module, which simulates the switching of the closing position state and the opening position state of the analog switch to perform remote signaling, remote measurement and remote control test on the terminal; a relay protection module, which is used for performing protection checking on the terminal according to the current analog quantity; a battery detection module, which is used for detecting the internal resistance, capacity and output current and voltage of the battery of the terminal; a control module, which receives the trigger signal and generates a test instruction, and sends the test instruction to the analog switch module, the relay protection module and the battery detection module, and receives the response test information; and an analysis module, which is connected with the control module, analyzes the expected test result of the test instruction, compares and analyzes the expected test result with the test information to obtain a checking result, and outputs the checking result to the trigger display module for display.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power distribution automation, and in particular to a power distribution automation terminal checking device and method. BACKGROUND

[0002] Power distribution automation refers to the use of modern electronics, computers, communication and network technology to integrate online data and offline data of power distribution networks, power distribution network data and user data, power grid structure and geographic graphics to form a complete automation system. With the comprehensive construction of power distribution automation, the number of power distribution automation equipment has increased dramatically. However, due to the long time span, the types and models of the equipment are various, which brings difficulties to the detection and debugging work.

[0003] Whether the FTU (Feeder Terminal Unit, power distribution automation feeder terminal) can work efficiently is an important factor to determine whether the entire regional power grid can be safely and efficiently powered. In order to ensure that the FTU can normally cooperate with the power distribution network to realize comprehensive monitoring and control functions, the FTU needs to be tested before it is formally put into use.

[0004] The traditional test of the power distribution feeder terminal FTU is to apply a test voltage and current on the primary side to make the FTU execute the on and off commands, and to observe whether the body can correctly act to test the FTU. Although this method is accurate and intuitive, it must be operated with power off when testing with the switch body, which affects the normal operation of the line, and many switches need to be tested one by one, which is difficult to operate, time-consuming and complicated.

[0005] Currently, a single terminal can be detected by a variety of detection equipment, and a current signal is sent by a multifunctional signal generator to test and debug the power distribution feeder terminal FTU. This method has high testing accuracy, but it also requires power-off operation. However, the line power-off opportunity is rare, and the pull handle line is not usually completely stopped, so the tie-in switch and its terminal cannot be debugged.

[0006] In addition, the current testing device has a single function, and the remote control, remote signaling and remote measurement functions must be tested separately. The signal acceptance work currently still needs to be checked by telephone by the cooperation of the control personnel and the power distribution personnel, which is time-consuming and costly. SUMMARY

[0007] In order to solve the problem of single function and complicated testing process of the current testing device, the present application provides a power distribution automation terminal checking device and method.

[0008] In the first aspect, the present application provides a power distribution automation terminal checking device, which adopts the following technical scheme:

[0009] A power distribution automation terminal checking device, comprising:

[0010] The trigger display module triggers and generates a trigger signal according to the test requirement;

[0011] The analog switch module is connected with the terminal, and the on position state or the off position state of the analog switch is switched according to the on position state and the off position state to perform the remote signaling, the remote measurement and the remote control test of the terminal;

[0012] The relay protection module is connected with the terminal, and is used for outputting the current analog quantity to perform the protection verification of the terminal according to the current analog quantity;

[0013] The battery detection module is connected with the terminal, and is used for detecting the battery internal resistance, the battery capacity and the output current and voltage of the battery of the terminal;

[0014] The control module is connected with the trigger display module, receives the trigger signal and generates a test instruction, is connected with the analog switch module, the relay protection module and the battery detection module through the CAN bus, and sends the test instruction to the analog switch module, the relay protection module and the battery detection module, and receives the test information responded by the analog switch module, the relay protection module, the battery detection module and the terminal;

[0015] The analysis module is connected with the control module, receives the test instruction and the test information, analyzes the expected test result of the test instruction, compares and analyzes the expected test result with the test information to obtain a verification result, and outputs the verification result to the trigger display module for display.

[0016] By adopting the above technical scheme, the centralized control module generates a test instruction after receiving the trigger signal, then controls the three test modules to perform the test respectively, and returns the test information of the three modules and the test information of the terminal in the test process, the final terminal verification result is obtained through the analysis and judgment of the test information, the function of the test device is diversified, and various detections of the terminal can be completed through the test device only, the test process is simple, and the test efficiency is improved.

[0017] Optionally, the analog switch module comprises:

[0018] The off position input unit is connected with the centralized control module to receive the off position instruction;

[0019] The on position input unit is connected with the centralized control module to receive the on position instruction;

[0020] Two optoelectronic couplers, including a light emitting diode and a photosensitive triode, one optoelectronic coupler is connected with the off position input unit to receive the off position instruction and convert it into an off position execution electric signal, and the other optoelectronic coupler is connected with the on position input unit to receive the on position instruction and convert it into an on position execution electric signal;

[0021] The double-position self-holding relay is connected with a terminal, connected with two photoelectric couplers, receives an opening execution electric signal or a closing execution electric signal and changes a relay state to generate test information, and connected with a centralized control module and returns the test information.

[0022] By adopting the technical scheme, after the opening input unit receives an opening instruction or the closing input unit receives a closing instruction, the double-position self-holding relay is not easily disturbed by the isolation of the photoelectric coupler.

[0023] Optionally, the double-position self-holding relay includes two common contacts, two normally open contacts and two normally closed contacts, in the opening state, the common contacts are connected with the normally closed contacts and disconnected with the normally open contacts, and in the closing state, the common contacts are connected with the normally open contacts and disconnected with the normally closed contacts.

[0024] Optionally, the double-position self-holding relay further includes:

[0025] The opening operation switch unit is connected with the photoelectric coupler and connected in parallel with the opening input unit, generates an opening instruction after being triggered, and sends the opening instruction to the photoelectric coupler.

[0026] The closing operation switch unit is connected with the photoelectric coupler and connected in parallel with the closing input unit, generates a closing instruction after being triggered, and sends the closing instruction to the photoelectric coupler.

[0027] Optionally, the current analog quantity generated by the relay protection module using the current analog adjusting circuit is a 50Hz sine wave current signal, and the pulse intensity of the current signal is 0-10A.

[0028] By adopting the technical scheme, the use of a 50Hz sine wave signal can more truly simulate the working environment of the power grid, so as to more accurately test the performance of the terminal under actual operating conditions, and according to different models of the terminal, the pulse intensity of the current signal is adjusted, so that the test is more accurate and more in line with the actual situation.

[0029] Optionally, the current analog adjusting circuit includes two half-bridge drivers IR2104S respectively driving two pairs of MOS tubes to form a full-bridge switching circuit.

[0030] The generation of the 50Hz sine wave current signal includes:

[0031] The centralized control module outputs two groups of SPWM pulse trigger signals with a frequency of 50Hz, a duty ratio and an adjustable dead time.

[0032] The half-bridge driver IR2104S distributes the two groups of pulse trigger signals to the corresponding MOS tubes respectively to form a 50Hz quasi-sine wave, and then the 50Hz sine wave is output by low-pass filter shaping and filtering.

[0033] Optionally, a temperature detection control circuit composed of a double operational amplifier LM258DR is used on each of the two pairs of MOS transistors to detect the temperature of the two pairs of MOS transistors respectively, and when the temperature of at least one MOS transistor is detected to be too high, the centralized control module stops outputting, and the double operational amplifier LM258DR specifically includes:

[0034] The in-phase input pin IN1+ is connected with the drain of the MOS transistor and receives the voltage signal of the MOS transistor;

[0035] The output pin OUT1 is used for outputting the processed first voltage signal;

[0036] The inverting input pin IN1- is connected with the output pin OUT1 and receives the first voltage signal as the inverting input;

[0037] The ground pin GND provides the zero potential reference point of the circuit;

[0038] The in-phase input pin IN2+ is connected with the power supply and is used for inputting the reference voltage signal;

[0039] The output pin OUT2 is connected with the centralized control module and outputs the second voltage signal used for controlling the output function of the centralized control module;

[0040] The inverting input pin IN2- is connected with the output pin OUT1 and the output pin OUT2 and is used for receiving part of the first voltage signal and part of the second voltage signal as the inverting input;

[0041] The power supply pin VCC provides the positive power supply voltage.

[0042] By adopting the above technical solution, the MOS transistor is protected, and the service life of the verification device is prolonged.

[0043] Optionally, the analysis module further has an alarm unit, and when the battery voltage returned by the battery detection module is not higher than the voltage threshold, the alarm unit is controlled to alarm.

[0044] By adopting the above technical solution, when the battery voltage is not higher than the voltage threshold, it indicates that the battery voltage is too low, and at this time, the battery needs to be charged, and the alarm unit alarms to remind the staff to charge or replace, etc.

[0045] In a second aspect, the present application provides a power distribution automation terminal verification method, which is used for the above device and includes the following steps:

[0046] S1, generating a test instruction according to a test requirement;

[0047] S2, based on the test instruction, the analog switch module simulates the terminal closing and opening position state to carry out remote signaling, remote measurement, remote sensing test, and / or the relay protection module obtains the analog current to carry out terminal protection verification, and / or the battery detection module detects the battery internal resistance, capacity and output current voltage, and returns the test information;

[0048] S3, analyzing the expected test result of the test instruction, and comparing and analyzing the expected test result with the test information to obtain a verification result;

[0049] S4, outputting the verification result to the trigger display module for display.

[0050] In summary, the present application has the following beneficial technical effects:

[0051] The plurality of detection devices are integrated into one verification device, which facilitates the operator to carry out multiple detections, adopts the simulated closing and opening operation, improves the detection accuracy, and the test process is simple, without the need for the staff to cooperate with the remote test, thereby improving the test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 is a structure schematic view of a power distribution automation terminal verification device of an embodiment of the present application.

[0053] Figure 2 is a structure schematic view of an analog switch module of an embodiment of the present application.

[0054] Figure 3 is a structure schematic view of a current analog adjusting circuit of an embodiment of the present application.

[0055] Figure 4 is a structure schematic view of a temperature detection control circuit of an embodiment of the present application.

[0056] Figure 5 is a flow schematic view of a power distribution automation terminal verification method of an embodiment of the present application. DETAILED DESCRIPTION

[0057] The following will be described in combination with the accompanying Figures 1-4 The present application will be further described in detail.

[0058] Embodiment 1

[0059] Referring to Figure 1 The power distribution automation terminal verification device of the embodiment comprises a trigger display module, an analog switch module, a relay protection module, a battery detection module, a centralized control module and a warning module.

[0060] The trigger display module triggers and generates a trigger signal according to test requirements; the trigger display module comprises a one-key test button, a plurality of single-item test buttons and a display screen; the display screen is a touch screen; the one-key test button and the plurality of single-item test buttons are arranged on the display screen; the display screen displays terminal verification results; a test program is pre-written in the centralized control module; when a button trigger signal is detected, specific test instructions are generated according to the program settings;

[0061] The one-key test button generates a one-key test trigger signal after being triggered; the centralized control module receives the one-key test trigger signal, generates corresponding one-key test instructions and sends the one-key test instructions to the control analog switch module, the relay protection module and the storage battery detection module for testing, and returns test information of the analog switch module, the relay protection module, the storage battery detection module and the terminal;

[0062] The plurality of single-item test buttons generate specified item test trigger signals after being triggered; the centralized control module receives the specified item test trigger signals, generates corresponding specified item test instructions, tests the specified analog switch module or the relay protection module or the storage battery detection module, and returns analog switch module test information and terminal test information, or relay protection module test information and terminal test information, or storage battery detection module test information;

[0063] The analog switch module is connected with corresponding input ports of the terminal by using a double-position self-holding relay; specifically, the closing position contact is connected to a port for detecting the closing state, and the opening position contact is connected to a port for detecting the opening state; the closing state or the opening state of the analog switch is used to test the remote signaling, the remote sensing and the remote control of the terminal according to the switching of the closing state and the opening state;

[0064] The double-position self-holding relay is a relay with two stable positions, usually closing and opening, and can maintain its position after power-off. When the relay receives a trigger signal, it will switch to the corresponding closing or opening position, and can maintain the position after the trigger signal disappears until the opposite trigger signal is received. It can stably work between the closing and opening positions, and will not change the position due to external interference or temporary signal changes. Therefore, it is used to simulate the closing and opening operations.

[0065] The remote signaling, the remote sensing and the remote control test performed by the analog switch module include:

[0066] The double-position self-holding relay is switched to the closing position, and the closing is kept for a period of time to ensure that the terminal stably receives the signal, and then the double-position self-holding relay is switched to the opening position. The centralized control module receives the analog remote signaling returned by the analog switch module and the actual remote signaling returned by the terminal, compares and analyzes the analog remote signaling and the actual remote signaling, and obtains a remote signaling detection result. The analog remote signaling includes closing information and opening information of the double-position self-holding relay operation, and the actual remote signaling includes closing and opening information actually detected by the terminal. When the analog remote signaling is inconsistent with the actual remote signaling, it indicates that there is a problem with the terminal, and the result is output to the display screen, and the staff can repair the terminal according to the result.

[0067] When the closing or opening state is switched, the centralized control module receives the closing or opening state switching signal returned by the analog switch module and the remote measurement signal reflecting the change of the electrical parameter returned by the terminal, and obtains a remote measurement detection result through remote measurement signal analysis when the closing or opening state is switched. When the closing is switched to the opening, the electrical parameter should continuously decrease to 0, and when the opening is switched to the closing, the electrical parameter should continuously increase from 0 to a certain degree. The actual electrical parameter change reflected by the remote measurement signal is compared with the theoretical electrical parameter change. When there is inconsistency, it indicates that there is a problem with the terminal, and the result is output to the display screen, and the staff can repair the terminal according to the result.

[0068] The remote control closing or opening instruction is sent to the terminal, the terminal controls the analog switch module to close or open according to the instruction, the centralized control module receives the remote control signal reflecting the closing or opening returned by the analog switch module, and obtains a remote control detection result through comparison and analysis of the remote control instruction and the remote control signal. When the terminal receives the remote control closing instruction, the analog switch module should be controlled to perform the closing operation, and when the terminal receives the remote control opening instruction, the analog switch module should be controlled to perform the opening operation. When the reflected remote control signal is inconsistent with the operation that the terminal should perform according to the remote control instruction, it indicates that there is a problem with the terminal, and the result is output to the display screen, and the staff can repair the terminal according to the result.

[0069] Reference Figure 2 The analog switch module comprises:

[0070] The opening input unit is connected with the centralized control module to accept the opening instruction;

[0071] The closing input unit is connected with the centralized control module to accept the closing instruction;

[0072] Two optocouplers, including a light-emitting diode and a photosensitive triode, one optocoupler is connected with the opening input unit to accept the opening instruction and convert it into an opening execution electrical signal, and the other optocoupler is connected with the closing input unit to accept the closing instruction and convert it into a closing execution electrical signal.

[0073] The opening operation switch unit is connected with the photocoupler and is connected in parallel with the opening input unit, generates an opening instruction after triggering, and delivers the opening instruction to the photocoupler.

[0074] The closing operation switch unit is connected with the photocoupler and is connected in parallel with the closing input unit, generates a closing instruction after triggering, and delivers the closing instruction to the photocoupler.

[0075] The double-position self-holding relay is connected with the terminal, is connected with the two photocouplers, receives the opening execution electric signal or the closing execution electric signal and changes the relay state to generate test information, and is connected with the centralized control module and returns the test information; the double-position self-holding relay includes two common contacts, two normally open contacts, and two normally closed contacts, in the opening state, the common contacts are connected with the normally closed contacts and disconnected with the normally open contacts, and in the closing state, the common contacts are connected with the normally open contacts and disconnected with the normally closed contacts.

[0076] The relay protection module is connected with the current input port of the terminal and outputs a current analog quantity by using a current analog adjusting circuit, the current analog quantity generated by the relay protection module is a 50Hz sine wave current signal, the pulse strength of the current signal is 0-10A, and the pulse strength of the current signal is adjustable. A voltage analog quantity output by a voltage stabilizer can also be used for protection verification of the terminal. The terminal is protected and verified according to the current analog quantity; the reaction of the terminal to the current analog quantity is returned to the centralized control module as test information and compared with a preset threshold value to determine whether the terminal has a problem. For example, theoretically, the current analog quantity will cause tripping, the terminal is checked to determine whether the terminal trips in time when the current exceeds the set threshold value and the tripping time, and the tripping position of the terminal is compared with a preset result and a preset tripping time to determine whether the tripping position of the terminal has a problem and whether the terminal needs to be repaired.

[0077] Reference Figure 3 The current analog adjusting circuit includes two half-bridge drivers IR2104S that respectively drive two pairs of MOS tubes to form a full-bridge switching circuit; in an actual power grid, the frequency of alternating current is usually 50Hz or 60Hz. Using a 50Hz sine wave signal can more truly simulate the working environment of the power grid, so that the performance of the FTU and the DTU under actual operating conditions can be more accurately tested, and the pulse strength of the current signal is determined according to the design requirements and performance standards of the FTU to ensure that the action reliability and sensitivity of the FTU can be comprehensively tested.

[0078] The generation of the 50Hz sine wave current signal includes:

[0079] The two groups of SPWM pulse trigger signals with adjustable duty ratio and dead time are outputted by the centralized control module, and the two groups of pulse signals have the same frequency and opposite phase.

[0080] The two groups of pulse trigger signals are respectively distributed to the corresponding MOS transistors by the half-bridge driver IR2104S, the on-off of the MOS transistors is controlled, a 50Hz quasi-sine wave is formed, and then the 50Hz sine wave is outputted by the low-pass filter.

[0081] The pins of the half-bridge driver IR2104S are represented as:

[0082] VCC: power supply pin, usually connected to the positive power supply voltage.

[0083] IN: input pin, used for receiving the PWM signal for controlling the MOS;

[0084] SD: shutdown pin, used for controlling the shutdown function of the chip;

[0085] COM: common pin, connected to the power supply ground;

[0086] VB: bootstrap power supply pin, providing power supply for the driving of the MOS transistor through the bootstrap capacitor;

[0087] HO: high-side output pin, connected to the gate of the high-side MOS transistor;

[0088] LO: low-side output pin, connected to the gate of the low-side MOS transistor.

[0089] Referring to Figure 4 A temperature detection control circuit composed of a dual operational amplifier LM258DR is used on each of the two pairs of MOS transistors to detect the temperature of each pair of MOS transistors. When the temperature of at least one MOS transistor is detected to be too high, the AD conversion output is sent to the centralized control module, so that the centralized control module stops outputting the SPWM pulse trigger signal.

[0090] The specific pin connection of the dual operational amplifier LM258DR includes:

[0091] The in-phase input pin IN1+ is connected to the drain of a MOS transistor and receives the voltage signal of the MOS transistor;

[0092] The output pin OUT1 is used for outputting the processed first voltage signal;

[0093] The anti-phase input pin IN1- is connected to the output pin OUT1 and receives the first voltage signal as the anti-phase input,

[0094] Ground pin GND: provides a zero potential reference point for the circuit; ensures that the current of the entire circuit can form a complete loop, stabilizing the circuit operation.

[0095] In-phase input pin IN2+: connected to the power supply, the power supply is divided by resistors R3, R4 and R5 to obtain a reference voltage signal, and input to IN2+;

[0096] Output pin OUT2: connected to the centralized control module, outputs a second voltage signal for controlling the output function of the centralized control module;

[0097] Anti-phase input pin IN2-: connected to output pin OUT1 through resistor R1, and connected to output pin OUT2 through resistor R2, used to receive part of the first voltage signal and part of the second voltage signal as anti-phase input;

[0098] Power supply pin VCC: provides a positive power supply voltage.

[0099] The battery detection module is connected with the battery using an internal resistance detector to detect the internal resistance of the battery. The internal resistance is an important indicator of battery performance, and the size of the internal resistance can reflect the health status and remaining capacity of the battery. The constant current discharge method is used to detect the capacity of the battery. During detection, the battery is discharged at a constant current, and the centralized control module records the discharge time. According to the product of the discharge current and the discharge time, the amount of electricity discharged by the battery can be calculated, thereby evaluating the capacity of the battery. The Hall sensor is connected with the battery to detect the output current and voltage of the battery.

[0100] The alarm unit is set in the analysis module and is set as an alarm lamp in this embodiment. It is fixedly installed on the verification device. The analysis module adjusts the analysis of the battery according to the needs and different battery conditions. When the battery voltage returned by the battery detection module is not higher than the voltage threshold, the alarm lamp of the alarm module is controlled to sound and light alarm, reminding the staff to charge the battery or replace the battery in time.

[0101] The centralized control module includes a key module signal connection, receives a trigger signal and generates a test instruction, and is connected with the analog switch module, the relay protection module and the battery detection module using the CAN bus, and sends the test instruction to the analog switch module, the relay protection module and the battery detection module. The analog switch module, the relay protection module, the battery detection module and the terminal respond to the test information received by the centralized control module.

[0102] In the centralized control module, the DC 24V lithium ion battery converts DC 24V into DC 12V through the voltage regulator LM2596S, and then converts DC 12V into DC 5V through the three-terminal voltage regulator LM7805. The B-0505S is used to isolate the DC 5V voltage and then supply power to the centralized control module. The influence of the peripheral circuit on the centralized control module is eliminated.

[0103] The analysis module is connected with the control module, receives the test instruction and the test information, analyzes the expected test result of the test instruction, compares and analyzes the expected test result with the test information to obtain a verification result, and outputs the verification result to the trigger display module for display.

[0104] Embodiment 2

[0105] The difference between this embodiment and embodiment 1 is that this embodiment provides a power distribution automation terminal verification method, which refers to Figure 5 The method is used for the device described above, and includes the following steps:

[0106] S1, generating a test instruction according to a test requirement;

[0107] S2, based on the test instruction, the switch module simulates the terminal closing and opening position state to perform remote signaling, remote measurement, and remote sensing test, and / or the relay protection module acquires simulated current to perform terminal protection verification, and / or the battery detection module detects the internal resistance, capacity, and output current and voltage of the battery, and returns test information;

[0108] S3, analyzing the expected test result of the test instruction, and comparing and analyzing the expected test result with the test information to obtain a verification result;

[0109] S4, outputting the verification result to the trigger display module for display.

[0110] The test instruction includes a one-key test instruction and a specified item test instruction;

[0111] Based on the one-key test instruction, the remote signaling, remote measurement, remote sensing test, terminal protection verification, and battery detection are performed in sequence;

[0112] Based on the specified item test instruction, the specified remote signaling, remote measurement, remote sensing test, terminal protection verification, or battery detection is performed.

[0113] When the power distribution automation terminal is checked, the worker clicks the one-key test button to perform remote signaling, remote measurement, remote sensing test, terminal protection check and battery test in turn, or the worker clicks the specified item test button to perform the test of the specified item. After the test is completed, the checking device analyzes and processes the test information, and outputs the performance of the terminal in each test to the display screen. The worker understands the current status of the terminal by checking the display screen, and repairs the terminal when there is a problem.

[0114] The various embodiments are described in the present specification in progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the various embodiments can be mutually referred to. For the method disclosed by the embodiments, since it corresponds to the system disclosed by the embodiments, the description is relatively simple, and the relevant part can be referred to the method part.

[0115] The skilled person can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present specification can be realized by electronic hardware, computer software or combination of both. In order to clearly show the interchangeability of hardware and software, the composition and steps of each example have been described in general in the above description. Whether the functions are realized by hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0116] The above disclosure is only the preferred embodiment of the present application, but the present application is not limited thereto. Any non-creative changes and several improvements and refinements made by those skilled in the art without departing from the principles of the present application should fall within the scope of protection of the present application.

Claims

1. A power distribution automation terminal verification device, characterized in that, include: The trigger display module generates a trigger signal based on test requirements. The analog switch module uses a dual-position self-holding relay connected to the corresponding input port of the terminal to simulate the closed or open position of the switch. Based on the switching between the closed and open position states, the terminal performs remote signaling, telemetry, and remote control tests. The relay protection module uses a current analog regulation circuit to connect to the current input port of the terminal and outputs a current analog quantity. The terminal is then protected based on the current analog quantity. The battery detection module is connected to the terminal and is used to detect the battery's internal resistance, battery capacity, and battery output current and voltage. The centralized control module is connected to the trigger display module, receives trigger signals and generates test commands. It uses a CAN bus to connect with the analog switch module, relay protection module and battery detection module, and sends test commands to the analog switch module, relay protection module and battery detection module, and receives test information from the analog switch module, relay protection module and battery detection module and the terminal response. The analysis module, connected to the centralized control module, receives test commands and test information, analyzes the expected test results of the test commands, compares and analyzes the expected test results with the test information to obtain the verification results, and outputs the verification results to the trigger display module for display. The analog switch module includes: The tripping input unit is connected to the centralized control module to receive tripping commands. The closing input unit is connected to the centralized control module to receive closing commands. Two optocouplers, including a light-emitting diode and a phototransistor, are used. One optocoupler is connected to the tripping input unit, receives the tripping command and converts it into a tripping execution electrical signal, and the other optocoupler is connected to the closing input unit, receives the closing command and converts it into a closing execution electrical signal. A dual-position self-holding relay, connected to the terminal; connected to both optocouplers, receiving opening or closing execution signals and changing the relay state to generate test information; connected to the centralized control module and returning test information; The tripping operation switch unit is connected to the optocoupler and in parallel with the tripping input unit. After being triggered, it generates a tripping command and sends the tripping command to the optocoupler. The closing operation switch unit is connected to the optocoupler and in parallel with the closing input unit. After being triggered, it generates a closing command and sends the closing command to the optocoupler. The dual-position self-holding relay includes two common contacts, two normally open contacts, and two normally closed contacts. In the open state, the common contacts are connected to the normally closed contacts and disconnected from the normally open contacts. In the closed state, the common contacts are connected to the normally open contacts and disconnected from the normally closed contacts. The relay protection module uses a current analog regulation circuit to generate a 50Hz sinusoidal current signal with a pulse intensity of 0~10A.

2. The power distribution automation terminal verification device according to claim 1, characterized in that, The current analog regulation circuit includes two half-bridge drivers IR2104S, which respectively drive a full-bridge switching circuit composed of two pairs of MOSFETs; The generation of a 50Hz sinusoidal current signal includes: The centralized control module outputs two sets of SPWM pulse trigger signals with an adjustable frequency of 50Hz, duty cycle, and dead time. The half-bridge driver IR2104S distributes two sets of pulse trigger signals to the corresponding MOS transistors to form a 50Hz quasi-sine wave, which is then shaped and filtered by a low-pass filter to output a 50Hz sine wave.

3. The power distribution automation terminal verification device according to claim 2, characterized in that, A temperature detection and control circuit using a dual operational amplifier LM258DR is employed on each of the two pairs of MOSFETs to detect the temperature of each pair. When at least one MOSFET is detected to be overheated, the centralized control module stops outputting. The dual operational amplifier LM258DR specifically includes: The non-inverting input pin IN1+ is connected to the drain of a MOSFET to receive the voltage signal from the MOSFET. The output pin OUT1 is used to output the processed first voltage signal; Inverting input pin IN1-: Connected to output pin OUT1, it receives the first voltage signal as an inverting input; Ground pin GND: Provides the zero potential reference point for the circuit; Non-inverting input pin IN2+: Connected to the power supply and used to input a reference voltage signal; Output pin OUT2: Connected to the centralized control module, it outputs a second voltage signal used to control the output function of the centralized control module; Inverting input pin IN2-: Connected to both output pins OUT1 and OUT2, used to receive a portion of the first voltage signal and a portion of the second voltage signal as an inverting input; Power supply pin VCC: Provides positive power supply voltage.

4. The power distribution automation terminal verification device according to claim 1, characterized in that, The analysis module also includes an alarm unit. When the battery voltage returned by the battery detection module is not higher than the voltage threshold, the alarm unit is activated to sound an alarm.

5. A method for verifying distribution automation terminals, characterized in that, The method, used in the apparatus according to any one of claims 1-4, includes the following steps: S1, test instructions generated based on test requirements; S2, based on test commands, simulates the terminal closing and opening position states of the switch module to perform remote signaling, remote measurement, and remote sensing tests, and / or the relay protection module obtains the simulated current to perform terminal protection verification, and / or the battery detection module detects the battery internal resistance, capacity, and output current and voltage, and returns test information; S3, analyze the expected test results of the test instructions, and compare the expected test results with the test information to obtain the verification results; S4 outputs the verification result to the trigger display module for display.

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