Power distribution automation terminal verification device and method

Abstract

The invention relates to a power distribution automation terminal verification device and method, and the device comprises a trigger display module which triggers and generates a trigger signal according to a test demand; the analog switch module is used for simulating switching between the switching-on position state and the switching-off position state of a switch to carry out remote signaling, remote measurement and remote control tests of the terminal; the relay protection module is used for performing protection verification on the terminal according to the current analog quantity; the storage battery detection module is used for detecting the storage battery internal resistance, the storage battery capacity and the output current and voltage of the storage battery of the terminal; the control module receives the trigger signal, generates a test instruction, sends the test instruction to the analog switch module, the relay protection module and the storage battery detection module, and receives response test information; and the analysis module is connected with the control module, analyzes an 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.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution automation, and in particular to a power distribution automation terminal calibration device and method. Background Art

[0002] Distribution automation refers to the use of modern electronics, computers, communications and network technologies to integrate online and offline data of the distribution network, distribution network data and user data, grid structure and geographic graphics to form a complete automation system. With the comprehensive construction of distribution automation, the number of distribution automation equipment has increased dramatically, but due to the long time span and the variety of equipment types and models, it has brought difficulties to the detection and debugging work.

[0003] Whether the FTU (Feeder Terminal Unit) can work efficiently is one of the important factors that determine whether the power grid in the entire area can supply power safely and efficiently. In order to ensure that the FTU can normally cooperate with the distribution network to achieve comprehensive monitoring and control functions, it is necessary to test the FTU before it is officially put into use.

[0004] The traditional distribution feeder terminal FTU test applies a test voltage and current on the primary side to make the FTU execute the opening and closing commands, and observe whether the main body can operate correctly to test the FTU. Although this method is highly accurate and intuitive, it is necessary to shut down the power supply when testing the switch body, which affects the normal operation of the line. In addition, many switches need to be tested one by one, the equipment is large, the operation is difficult, the time is long, and the process is cumbersome.

[0005] Currently, a single terminal can be tested through a variety of detection equipment. A multi-function signal generator is used to send out current signals to test and debug the distribution feeder terminal FTU. This method has high testing accuracy, but it also requires power outage operations. However, there are few opportunities for line power outages, and the handle line is generally not completely stopped, so the contact switch and its terminal cannot be debugged.

[0006] In addition, the current test equipment has a single function, and the remote control, remote signaling and telemetering functions must be tested separately. The signal acceptance work currently requires the cooperation of control personnel and distribution personnel to verify the signal by phone, which is time-consuming and costly. Summary of the invention

[0007] In order to solve the problem that the current testing device has a single function and a complicated testing process, the present invention provides a distribution automation terminal calibration device and method.

[0008] In the first aspect, the present invention provides a distribution automation terminal verification device, which adopts the following technical solution: A distribution automation terminal calibration device, comprising: Trigger display module, trigger and generate trigger signal according to test requirements; The simulation switch module is connected to the terminal to simulate the closing position state or the opening position state of the switch, and performs the remote signaling, remote measurement and remote control test of the terminal according to the switching of the closing position state and the opening position state; The relay protection module is connected to the terminal and is used to output the current analog quantity and perform protection verification on the terminal according to the current analog quantity; A battery detection module is connected to the terminal and is used to detect the battery internal resistance, battery capacity and output current and voltage of the battery of the terminal; The control module is connected with the trigger display module, receives the trigger signal and generates a test instruction, uses the CAN bus to connect with the analog switch module, the relay protection module and the battery detection module, 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; The analysis module is connected to the control module, receives the test instructions and test information, analyzes the expected test results of the test instructions, compares 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.

[0009] By adopting the above technical scheme, the centralized control module generates a test instruction after receiving the trigger signal, and then controls the three test modules to perform tests respectively, and returns the test information of the three modules and the test information of the terminal during the test process. The final terminal verification result is obtained by analyzing and judging the test information. The functions of the test device are diversified, and various detections of the terminal can be completed only through the test device. The test process is simple and the test efficiency is improved.

[0010] Optionally, the analog switch module includes: The opening input unit is connected to the centralized control module to receive the opening command; The closing input unit is connected to the centralized control module to receive the closing command; Two photoelectric couplers, including a light emitting diode and a phototransistor, one photoelectric coupler is connected to the opening input unit, receives an opening instruction and converts it into an opening execution electrical signal, and the other photoelectric coupler is connected to the closing input unit, receives a closing instruction and converts it into a closing execution electrical signal; A two-position self-holding relay is connected to the terminal; connected to both photoelectric couplers, receives an opening execution electrical signal or a closing execution electrical signal and changes the relay state to generate test information; connected to a centralized control module and returns the test information.

[0011] By adopting the above technical solution, after the opening input unit receives an opening command or the closing input unit receives a closing command, the dual-position self-holding relay is not easily disturbed through the isolation of the photoelectric coupler.

[0012] Optionally, 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.

[0013] Optionally, it also includes: The opening operation switch unit is connected to the photoelectric coupler and connected in parallel with the opening input unit, generates an opening command after being triggered, and transmits the opening command to the photoelectric coupler; The closing operation switch unit is connected to the photoelectric coupler and in parallel with the closing input unit. After being triggered, a closing command is generated and the closing command is transmitted to the photoelectric coupler.

[0014] Optionally, the current analog quantity generated by the current analog regulation circuit of the relay protection module is a 50Hz sinusoidal current signal, and the pulse intensity of the current signal is 0~10A.

[0015] By adopting the above technical solution, a 50Hz sine wave signal can be used to more realistically simulate the working environment of the power grid, thereby more accurately testing the performance of the terminal under actual operating conditions. According to the different models of the terminal, the pulse intensity of the current signal is adjusted to make the test more accurate and more practical.

[0016] Optionally, the current analog regulation circuit includes two half-bridge drivers IR2104S respectively driving a full-bridge switch circuit composed of two pairs of MOS tubes; The generation of a 50Hz sinusoidal current signal includes: The centralized control module outputs two sets of SPWM pulse trigger signals with a frequency of 50Hz, adjustable duty cycle and dead time; The half-bridge driver IR2104S distributes the two sets of pulse trigger signals to the corresponding MOS tubes to form a 50Hz quasi-sine wave, which is then shaped and filtered by a low-pass filter to output a 50Hz sine wave.

[0017] Optionally, a temperature detection control circuit composed of a dual operational amplifier LM258DR is used on each of the two pairs of MOS tubes to detect the temperature of the two pairs of MOS tubes respectively. When it is detected that the temperature of at least one MOS tube is too high, the centralized control module stops the output. The dual operational amplifier LM258DR specifically includes: The in-phase input pin IN1+ is connected to the drain of the MOS tube and receives the voltage signal of the MOS tube; The output pin OUT1 is used to output the processed first voltage signal; Inverting input pin IN1-: connected to the output pin OUT1, receiving the first voltage signal as an inverting input; Ground pin GND: provides the zero potential reference point of the circuit; In-phase input pin IN2+: connected to the power supply, used to input the reference voltage signal; Output pin OUT2: connected to the centralized control module, outputting a second voltage signal for controlling the output function of the centralized control module; Inverting input pin IN2-: connected to both output pin OUT1 and output pin OUT2, used for receiving part of the first voltage signal and part of the second voltage signal as inverting input; Power supply pin VCC: provides positive power supply voltage.

[0018] By adopting the above technical solution, the MOS tube is protected and the service life of the calibration equipment is extended.

[0019] Optionally, an alarm unit is further provided in the analysis module, and when the battery voltage returned by the battery detection module is not higher than a voltage threshold, the alarm unit is controlled to sound an alarm.

[0020] By adopting the above technical solution, when the battery voltage is not higher than the voltage threshold, it indicates that the battery voltage is low. At this time, the battery needs to be charged, and an alarm is sounded through the alarm unit to remind the staff to perform charging or replacement operations.

[0021] In a second aspect, the present invention provides a distribution automation terminal verification method, which is used in the above-mentioned device and comprises the following steps: S1, test instructions generated according to test requirements; S2, based on the test instruction, the analog switch module simulates the closing and opening position states of the terminal to perform telesignaling, telemetering, and telesensing tests, and / or the relay protection module obtains the analog 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 the test information; 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; S4, output the verification result to the trigger display module for display.

[0022] In summary, the present invention has the following beneficial technical effects: Integrating multiple detection equipment into one verification device makes it easier for operators to conduct multiple tests. The simulated closing and opening operations are used to improve the accuracy of the detection. The testing process is simple and does not require the cooperation of staff for remote testing, which improves the testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a distribution automation terminal verification device according to an embodiment of the present invention.

[0024] Figure 2 Schematic diagram of the structure of the analog switch module according to the embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the structure of the current simulation regulation circuit according to an embodiment of the present invention.

[0026] Figure 4 Schematic diagram of the structure of the temperature detection control circuit of the embodiment of the present invention.

[0027] Figure 5 It is a flow chart of a distribution automation terminal verification method according to an embodiment of the invention. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-4 The present invention is described in further detail.

[0029] Example 1 Reference Figure 1 A distribution automation terminal verification device of this embodiment includes: a trigger display module, an analog switch module, a relay protection module, a battery detection module, a centralized control module and a warning module.

[0030] The trigger display module is triggered and generates a trigger signal according to the test requirements; it includes: a one-touch test button, multiple single-item test buttons and a display screen. The display screen adopts a touch screen. The one-touch test button and multiple single-item test buttons are all set on the display screen. The display screen displays the terminal verification results; the pre-written test program is stored inside the centralized control module. When a button trigger signal is detected, a specific test instruction will be generated according to the program settings; After the one-key test button is triggered, a one-key test trigger signal is generated; the centralized control module receives the one-key test trigger signal, generates a corresponding one-key test instruction and sends it to the control analog switch module, relay protection module, and battery detection module for testing, and returns the test information of the analog switch module, relay protection module, battery detection module and terminal; After the multiple single-item test buttons are triggered, designated item test trigger signals are generated respectively; the centralized control module receives the designated item test trigger signal, generates corresponding designated item test instructions, tests the designated analog switch module or relay protection module or battery detection module, and returns the analog switch module test information and terminal test information, or the relay protection module test information and terminal test information, or the battery detection module test information; The analog switch module adopts a dual-position self-holding relay to connect with the corresponding input port of the terminal. Specifically, the closing position contact is connected to the port for detecting the closing state, and the opening position contact is connected to the port for detecting the opening state; the closing position state or the opening position state of the analog switch is switched, and the remote signaling, telemetry and remote control test of the terminal are performed according to the switching of the closing position state and the opening position state; A two-position self-holding relay is a relay that has two stable positions, usually closed and open, and can maintain its position after power failure. When the relay receives a trigger signal, it will switch to the corresponding closed or open position, and after the trigger signal disappears, it can remain in this position until it receives the opposite trigger signal. It can work stably between the closed and open positions and will not change position due to external interference or short-term signal changes. Therefore, it is used to simulate the operation of closing and opening.

[0031] The remote signaling, remote sensing and remote control tests performed by the analog switch module include: The two-position self-holding relay switches to the closed position and remains closed for a period of time to ensure that the terminal receives the signal stably, and then switches the two-position self-holding relay to the open position. The centralized control module receives the analog telesignaling signal returned by the analog switch module and the actual telesignaling signal returned by the terminal, and compares and analyzes the analog telesignaling signal and the actual telesignaling signal to obtain the telesignaling detection result; the analog telesignaling signal contains the closing and opening information of the two-position self-holding relay operation, and the actual telesignaling signal contains the actual closing and opening information detected by the terminal. When the analog telesignaling signal is inconsistent with the actual telesignaling signal, it means that there is a problem with the terminal. The result is output to the display screen, and the staff will repair the terminal according to the result.

[0032] 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 telemetry signal reflecting the change of electrical parameters returned by the terminal, and obtains the telemetry detection result by analyzing the telemetry signal when the closing or opening state is switched; when the closing state is switched to the opening state, the electrical parameters should continue to drop to 0, and when the opening state is switched to the closing state, the electrical parameters should continue to rise from zero to a certain level. The actual electrical parameter changes reflected by the telemetry signal are compared with the theoretical electrical parameter changes. When there is an inconsistency, it means that there is a problem with the terminal. The result is output to the display screen, and the staff will perform terminal maintenance based on the result.

[0033] Send a remote control closing or opening command to the terminal, and the terminal controls the analog switch module to close or open according to the command. The centralized control module receives the remote control signal reflecting the closing or opening returned by the analog switch module, and obtains the remote control detection result by comparing and analyzing the remote control command and the remote control signal. When the terminal receives the remote control closing command, it should control the analog switch module to close the switch. When the terminal receives the remote control opening command, it should control the analog switch module to open the switch. When the reflected remote control signal does not match the operation that the terminal should perform according to the remote control command, it indicates that there is a problem with the terminal. The result is output to the display screen, and the staff will perform terminal maintenance based on the result.

[0034] Reference Figure 2 , the analog switch module includes: The opening input unit is connected to the centralized control module to receive the opening command; The closing input unit is connected to the centralized control module to receive the closing command; Two photoelectric couplers, including a light emitting diode and a phototransistor, one photoelectric coupler is connected to the opening input unit, receives an opening instruction and converts it into an opening execution electrical signal, and the other photoelectric coupler is connected to the closing input unit, receives a closing instruction and converts it into a closing execution electrical signal; The opening operation switch unit is connected to the photoelectric coupler and connected in parallel with the opening input unit, generates an opening command after being triggered, and transmits the opening command to the photoelectric coupler; The closing operation switch unit is connected to the photoelectric coupler and connected in parallel with the closing input unit, generates a closing command after being triggered, and transmits the closing command to the photoelectric coupler; A two-position self-holding relay is connected to the terminal; connected to both photoelectric couplers, receives an opening execution electrical signal or a closing execution electrical signal and changes the relay state to generate test information; connected to a centralized control module and returns test information; wherein the two-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 to the normally closed contacts and disconnected from the normally open contacts. In the closing state, the common contacts are connected to the normally open contacts and disconnected from the normally closed contacts.

[0035] The relay protection module uses a current analog regulation circuit to connect to the current input port of the terminal and output the current analog quantity. 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. The voltage regulator can also be used to output the voltage analog quantity to perform terminal protection verification. The terminal is protected according to the current analog quantity; the terminal's response to the current analog quantity is returned to the centralized control module as test information to compare and judge with the preset threshold to determine whether there is a problem with the terminal. For example, in theory, the current current analog quantity will cause tripping. Check the terminal to make the terminal return whether it trips in time when the current exceeds the set threshold, as well as the tripping time, and compare with the preset result and the preset tripping time to determine whether there is a problem with the tripping position of the terminal and whether it needs to be repaired.

[0036] Reference Figure 3 The current simulation regulation circuit includes two half-bridge drivers IR2104S that drive two pairs of MOS tubes to form a full-bridge switch circuit. In the actual power grid, the frequency of AC power is usually 50Hz or 60Hz. Using a 50Hz sine wave signal can more realistically simulate the working environment of the power grid, so as to more accurately test the performance of FTU and DTU under actual operating conditions. The pulse intensity 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 fully tested.

[0037] The generation of a 50Hz sinusoidal current signal includes: The centralized control module outputs two sets of SPWM pulse trigger signals with a frequency of 50Hz, adjustable duty cycle and dead time. The two sets of pulse signals have the same frequency and opposite phases. The half-bridge driver IR2104S distributes the two sets of pulse trigger signals to the corresponding MOS tubes, controls the on and off of the MOS tubes, forms a 50Hz quasi-sine wave, which is then shaped and filtered by a low-pass filter to output a 50Hz sine wave.

[0038] Among them, the pins of the half-bridge driver IR2104S are represented as: VCC: Power supply pin, usually connected to the positive supply voltage.

[0039] IN: Input pin, used to receive the PWM signal to control MOS; SD: shutdown pin, used to control the shutdown function of the chip; COM: common pin, connected to the power ground; VB: Bootstrap power supply pin, providing power for the MOS tube driver through the bootstrap capacitor; HO: high-side output pin, connected to the gate of the high-side MOS tube; LO: Low-side output pin, connected to the gate of the low-side MOS tube.

[0040] Reference Figure 4 A temperature detection control circuit composed of a dual operational amplifier LM258DR is used on each of the two pairs of MOS tubes to detect the temperature of the two pairs of MOS tubes. When it is detected that the temperature of at least one MOS tube is too high, it is output to the centralized control module through AD conversion, so that the centralized control module stops outputting the SPWM pulse trigger signal.

[0041] The specific pin connections of the dual operational amplifier LM258DR include: The in-phase input pin IN1+ is connected to the drain of a MOS tube and receives the voltage signal of the MOS tube; The output pin OUT1 is used to output the processed first voltage signal; Inverting input pin IN1-: connected to output pin OUT1, receiving the first voltage signal as inverting input, Ground pin GND: provides the zero potential reference point of the circuit; ensures that the current of the entire circuit can form a complete loop and stabilize the circuit operation.

[0042] The non-inverting input pin IN2+ is connected to the power supply. The power supply is divided by resistors R3, R4 and R5 to obtain a reference voltage signal, which is then input to IN2+. Output pin OUT2: connected to the centralized control module, outputting a second voltage signal for controlling the output function of the centralized control module; Inverting input pin IN2-: connected to the output pin OUT1 through the resistor R1, and connected to the output pin OUT2 through the resistor R2, for receiving part of the first voltage signal and part of the second voltage signal as an inverting input; Power supply pin VCC: provides positive power supply voltage.

[0043] The battery detection module uses an internal resistance tester connected to the battery to detect the internal resistance of the battery. The internal resistance is an important indicator of battery performance. 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 battery capacity. During the detection, the battery is discharged at a constant current. At the same time, the centralized control module records the discharge time, and the product of the discharge current and the discharge time can be used to calculate the amount of electricity discharged by the battery, thereby evaluating the battery capacity. A Hall sensor is connected to the battery to detect the output current and voltage of the battery. The alarm unit is arranged in the analysis module, and is arranged as an alarm light in the present embodiment, which is fixedly mounted on the calibration device. The analysis module adjusts the analysis of the battery according to the demand and different battery conditions. When the battery voltage returned by the battery detection module is not higher than the voltage threshold, the alarm light of the alarm module is controlled to give an audible and visual alarm, reminding the staff to charge the battery or replace the battery in time.

[0044] The centralized control module includes connecting with the button module signal, receiving the trigger signal and generating the test instruction, connecting with the analog switch module, the relay protection module and the battery detection module by the CAN bus, sending the test instruction to the analog switch module, the relay protection module and the battery detection module, and receiving the test information of the analog switch module, the relay protection module, the battery detection module and the terminal response.

[0045] In the centralized control module, the DC24V lithium-ion battery converts the DC24V into DC12V through the voltage regulator LM2596S, and then converts it into DC5V through the three-terminal regulator LM7805. The DC5V voltage is isolated by B-0505S and then powered to the centralized control module. The influence of peripheral circuits on the centralized control module is eliminated.

[0046] The analysis module is connected to the control module, receives the test instructions and test information, analyzes the expected test results of the test instructions, compares 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.

[0047] Example 2 The difference between this embodiment and embodiment 1 is that this embodiment provides a distribution automation terminal verification method, referring to Figure 5 , the method is used for the above-mentioned device, comprising the following steps: S1, test instructions generated according to test requirements; S2, based on the test instruction, the analog switch module simulates the closing and opening position states of the terminal to perform telesignaling, telemetering, and telesensing tests, and / or the relay protection module obtains the analog 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 the test information; 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; S4, output the verification result to the trigger display module for display.

[0048] Test instructions include one-key test instructions and specified item test instructions; Based on one-button test command, remote signaling, telemetry, remote sensing test, terminal protection verification and battery detection are carried out in sequence; Based on the specified test instructions, perform the specified telesignaling, telemetering, telesensing test or terminal protection verification or battery detection.

[0049] When performing distribution automation terminal calibration, the staff clicks a one-touch test button to perform telesignaling, telemetering, telesensing tests, terminal protection calibration and battery tests in sequence, or the staff clicks a designated test button to perform designated test. After the test is completed, the calibration device analyzes and processes the test information and outputs the terminal's performance in each test to the display screen. The staff can understand the current status of the terminal by checking the display screen and perform maintenance if there is a problem with the terminal.

[0050] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. As for the method disclosed in the embodiment, since it corresponds to the system disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0051] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0052] The above disclosure is only a preferred embodiment of the present invention, but the present invention is not limited thereto. Any non-creative changes that can be thought of by a person skilled in the art, as well as several improvements and modifications made without departing from the principle of the present invention, should fall within the protection scope of the present invention.

Claims

1. A distribution automation terminal calibration device, characterized in that: include: Trigger display module, trigger and generate trigger signal according to test requirements; The simulation switch module is connected to the terminal to simulate the closing position state or the opening position state of the switch, and performs the remote signaling, remote measurement and remote control test of the terminal according to the switching of the closing position state and the opening position state; The relay protection module is connected to the terminal and is used to output the current analog quantity and perform protection verification on the terminal according to the current analog quantity; A battery detection module is connected to the terminal and is used to detect the battery internal resistance, battery capacity and output current and voltage of the battery of the terminal; The control module is connected with the trigger display module, receives the trigger signal and generates a test instruction, uses the CAN bus to connect with the analog switch module, the relay protection module and the battery detection module, 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; The analysis module is connected to the control module, receives the test instructions and test information, analyzes the expected test results of the test instructions, compares 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.

2. The distribution automation terminal verification device according to claim 1, characterized in that: The analog switch module includes: The opening input unit is connected to the centralized control module to receive the opening command; The closing input unit is connected to the centralized control module to receive the closing command; Two photoelectric couplers, including a light emitting diode and a phototransistor, one photoelectric coupler is connected to the opening input unit, receives an opening instruction and converts it into an opening execution electrical signal, and the other photoelectric coupler is connected to the closing input unit, receives a closing instruction and converts it into a closing execution electrical signal; A two-position self-holding relay is connected to the terminal; connected to both photoelectric couplers, receives an opening execution electrical signal or a closing execution electrical signal and changes the relay state to generate test information; connected to a centralized control module and returns the test information.

3. The distribution automation terminal verification device according to claim 2, characterized in that: 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.

4. The distribution automation terminal verification device according to claim 2, characterized in that: Also includes: The opening operation switch unit is connected to the photoelectric coupler and connected in parallel with the opening input unit, generates an opening command after being triggered, and transmits the opening command to the photoelectric coupler; The closing operation switch unit is connected to the photoelectric coupler and in parallel with the closing input unit. After being triggered, a closing command is generated and the closing command is transmitted to the photoelectric coupler.

5. The distribution automation terminal verification device according to claim 1, characterized in that: The current analog quantity generated by the current analog regulation circuit of the relay protection module is a 50Hz sinusoidal current signal, and the pulse intensity of the current signal is 0~10A.

6. The distribution automation terminal verification device according to claim 5, characterized in that: The current analog regulation circuit includes two half-bridge drivers IR2104S that respectively drive the full-bridge switch circuit composed of two pairs of MOS tubes; The generation of a 50Hz sinusoidal current signal includes: The centralized control module outputs two sets of SPWM pulse trigger signals with a frequency of 50Hz, adjustable duty cycle and dead time; The half-bridge driver IR2104S distributes the two sets of pulse trigger signals to the corresponding MOS tubes to form a 50Hz quasi-sine wave, which is then shaped and filtered by a low-pass filter to output a 50Hz sine wave.

7. The distribution automation terminal verification device according to claim 6, characterized in that: A temperature detection control circuit composed of a dual operational amplifier LM258DR is used on each of the two pairs of MOS tubes to detect the temperature of the two pairs of MOS tubes. When it is detected that the temperature of at least one MOS tube is too high, the centralized control module stops the output. The dual operational amplifier LM258DR specifically includes: The in-phase input pin IN1+ is connected to the drain of a MOS tube to receive the voltage signal of the MOS tube; The output pin OUT1 is used to output the processed first voltage signal; Inverting input pin IN1-: connected to the output pin OUT1, receiving the first voltage signal as an inverting input; Ground pin GND: provides the zero potential reference point of the circuit; In-phase input pin IN2+: connected to the power supply, used to input the reference voltage signal; Output pin OUT2: connected to the centralized control module, outputting a second voltage signal for controlling the output function of the centralized control module; Inverting input pin IN2-: connected to both output pin OUT1 and output pin OUT2, used for receiving part of the first voltage signal and part of the second voltage signal as inverting input; Power supply pin VCC: provides positive power supply voltage.

8. The distribution automation terminal verification device according to claim 1, characterized in that: The analysis module is also provided with 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 give an alarm.

9. A distribution automation terminal verification method, characterized in that: The method is used for the device according to claims 1-8, comprising the following steps: S1, test instructions generated according to test requirements; S2, based on the test instruction, the analog switch module simulates the closing and opening position states of the terminal to perform telesignaling, telemetering, and telesensing tests, and / or the relay protection module obtains the analog 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 the test information; 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; S4, output the verification result to the trigger display module for display.

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