A test device and a checking method for intelligent substation backup power automatic switching

Abstract

The application discloses a kind of test device and test method for intelligent substation backup power automatic switching, test device includes test component and simulation power source component, test component includes main control board, network interface expansion board and man-machine interaction unit, main control board is connected by the optical network interface of network interface expansion board and the backup power automatic switching equipment to be tested, main control board is also connected with man-machine interaction unit, simulation power source component includes current power amplifier board and voltage power amplifier board, current power amplifier board and voltage power amplifier board are connected by signal backplane and main control board, main control board receives external data by man-machine interaction unit, generates corresponding SV message data according to the simulation control instruction therein and sends to backup power automatic switching device by the optical network interface of network interface expansion board, also generates main wiring diagram according to the backup power automatic switching main wiring diagram parameter, after obtaining and analyzing SCD file, the association of backup power automatic switching and circuit breaker in main wiring diagram is established to be checked by operator.The application effectively overcomes the defects of existing tester.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of backup power automatic switching test, in particular to a test device and a checking method for backup power automatic switching of a smart substation. BACKGROUND

[0002] The backup power automatic switching device of a smart substation involves charging, discharging and action process, as shown in the following table, the existing backup power automatic switching modes include: incoming line backup power automatic switching, bridge backup power automatic switching, remote backup power automatic switching. Figure 1

[0003] The incoming line backup power automatic switching includes 1DL, 3DL combined position, 2DL separated position, and 2DL, 3DL combined position, 1DL separated position, the bridge backup power automatic switching includes 1DL, 2DL combined position, 3DL separated position, and the remote backup power automatic switching includes 1DL, 2DL, 3DL combined position.

[0004] In order to ensure the correctness of the protection logic, SCD configuration file and related link of the backup power automatic switching device of a smart substation, test instruments need to be used for checking. At present, the backup power automatic switching device of a smart substation needs to be equipped with three SV point-to-point optical ports to obtain corresponding power supply 1, power supply 2 and bus voltage data, three GOOSE point-to-point optical ports to interact with corresponding power supply 1, power supply 2 and bus coupler, and one GOOSE networking optical port to control the action of the internal bridge connection main transformer protection and bus protection.

[0005] Therefore, the optical ports equipped in the existing optical digital tester cannot meet the test requirements, and at least two optical digital testers are needed to complete the backup power automatic switching checking, which requires high cooperation between the two instruments, thereby causing complicated use and incomplete checking items. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a test device and a checking method for backup power automatic switching of a smart substation, thereby effectively solving the existing problems.

[0007] To solve the above technical problems, the technical solution provided by the present application is as follows:

[0008] A test device for backup power automatic switching of a smart substation, comprising a test component and a simulated power source component, the test component comprising a main control board, a network port expansion board and a man-machine interaction unit, the main control board being connected with the backup power automatic switching device to be tested through the optical network port of the network port expansion board, the main control board also being connected with the man-machine interaction unit, the simulated power source component comprising a current power amplifier board and a voltage power amplifier board, the current power amplifier board and the voltage power amplifier board being connected with the main control board through a signal backboard, the main control board being configured to perform the following functions:

[0009] ​Wait for and acquire external data from the human-computer interaction unit;

[0010] If it is a backup power transfer main wiring diagram parameter, generate a main wiring diagram according to the backup power transfer main wiring diagram parameter and send it to the human-computer interaction unit;

[0011] If it is an SCD file, parse the SCD file to obtain the connection relationship of each device of the smart substation, wait for a backup IED selection instruction, and according to the backup IED selection instruction, establish an association between the selected backup and the corresponding circuit breaker of the main wiring diagram;

[0012] If it is an analog control instruction, generate a corresponding analog quantity according to the analog control instruction, generate a corresponding SV message according to the analog quantity, and then send it to the backup device to be tested through the corresponding optical network port of the network port expansion board;

[0013] Wait for and acquire SV messages and / or GOOSE messages from the network port expansion board, and generate corresponding reports after parsing the SV messages and / or GOOSE messages.

[0014] Further, the main control board comprises a CPU and a FPGA connected to each other, the FPGA is connected to the current power amplifier board and the voltage power amplifier board through an AD converter, and the FPGA is further connected to the backup device to be tested through the optical network port of the network port expansion board; when generating a corresponding SV message according to the analog quantity:

[0015] The FPGA waits for and acquires data from the AD converter, and after data preprocessing, sends it to the CPU;

[0016] The CPU waits for and acquires data from the FPGA, generates an SV message after compressing and packaging the data, and updates the SV message data in the storage area at a preset time interval;

[0017] The CPU sends the data packet information of the SV message to the FPGA, and the FPGA transfers the corresponding message data from the storage area to the internal cache of the FPGA through the PCIE channel according to the data packet information, and then sends the message data in the internal cache of the FPGA to the backup device to be tested through the optical network port of the network port expansion board.

[0018] Further, the FPGA comprises an SV message sending port corresponding to the optical network port of the network port expansion board one by one, and each SV message sending port corresponds to two sending cache areas in the internal cache of the FPGA, and the message data in the two sending cache areas is sent to the corresponding SV message sending port in a ping-pong mode.

[0019] Further, when waiting for and acquiring SV messages and / or GOOSE messages from the network port expansion board:

[0020] The FPGA waits and acquires SV messages and / or GOOSE messages from the network port expansion board, and caches the SV messages and / or GOOSE messages in the internal cache of the FPGA, and then sends the SV messages and / or GOOSE message data in the internal cache of the FPGA to the CPU through the uplink network port.

[0021] Further, the human-computer interaction unit comprises a touch screen, a key board and an industrial control board, the touch screen and the key board are connected with the industrial control board, and the industrial control board is connected with the main control board.

[0022] Further, the analog power source assembly further comprises a current power amplifier main power supply board and a rectification filter board, the current power amplifier main power supply board is connected with the rectification filter board through the first channel of the signal backboard, and the rectification filter board is connected with the power supply end of the current power amplifier board and the voltage power amplifier board through the second channel of the signal backboard.

[0023] Further, the network port expansion board is further provided with a GPS module.

[0024] The application further provides a test method of the backup power supply automatic switching device of the intelligent transformer substation, which is applied to any test device for the backup power supply automatic switching device of the intelligent transformer substation and comprises the following steps:

[0025] 1) setting backup power supply automatic switching device main wiring diagram parameters through the interface of the human-computer interaction unit and waiting for displaying the main wiring diagram;

[0026] 2) importing an SCD file into the test device, selecting a backup power supply automatic switching device IED to be tested through the interface of the human-computer interaction unit, and waiting for the selected backup power supply automatic switching device to be associated with the corresponding circuit breaker of the main wiring diagram;

[0027] 3) selecting analog objects and switch quantities or analog quantities of the analog objects through the interface of the human-computer interaction unit;

[0028] 4) connecting the optical network port of the test device with the optical fiber of the backup power supply automatic switching device, triggering the test through the set switch quantities and analog quantities, and recording the bus voltage loss and the circuit breaker action time according to the test report generated by the test device after the test is completed.

[0029] Further, the switch quantities or analog quantities in step 3) specifically comprise: circuit breaker trip position monitoring of each interval intelligent terminal, bus voltage of a merging unit, incoming line voltage and incoming line current.

[0030] Further, triggering the test through the set switch quantities and analog quantities in step 4) specifically comprises: waiting for the backup power supply automatic switching device to be fully charged, issuing analog control instructions of target main transformer actions in the main wiring diagram through the interface of the human-computer interaction unit, and waiting for the test device to acquire feedback data of the selected backup power supply automatic switching device and generate a test report.

[0031] Compared with the prior art, the application has the advantages that:

[0032] In the test device of the application, the main control board is connected with the man-machine interaction unit and the network port expansion board, and the main control board is connected with the backup power automatic throw-in device through the network port expansion board, so that external data can be received through the man-machine interaction unit, corresponding SV message data is generated according to analog control instructions in the external data, and the SV message data is sent to the backup power automatic throw-in device through the optical network port of the network port expansion board, and corresponding main wiring diagram can be generated according to backup power automatic throw-in main wiring diagram parameters, after the SCD file is acquired and parsed, the association between the backup power automatic throw-in device and circuit breakers in the main wiring diagram is established for the operator to check, the integration is high, compared with the use of multiple optical digital testers, manpower is saved, errors are avoided, and the application is more economical and simple. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a substation bridge wiring topology diagram.

[0034] Figure 2 is a functional board connection diagram of an embodiment of the application.

[0035] Figure 3 is a hardware system block diagram of the main control board of an embodiment of the application.

[0036] Figure 4 is a check method flowchart of an embodiment of the application.

[0037] Figure 5 is an interface diagram of the man-machine interaction unit of an embodiment of the application.

[0038] Figure 6 is a report interface diagram of the man-machine interaction unit of an embodiment of the application.

[0039] Legend: 1-main control board, 2-network port expansion board, 3-man-machine interaction unit, 4-current power amplifier board, 5-voltage power amplifier board, 6-signal backboard, 7-current power amplifier main power supply board, 8-rectifier filter board. DETAILED DESCRIPTION

[0040] The application will be further described below in combination with the drawings of the specification and specific preferred embodiments, but the protection scope of the application is not limited by this.

[0041] The substation bridge wiring topology diagram is as follows Figure 1As shown, according to the charging logic of the automatic transfer switch, the automatic transfer switch needs to collect the following analog and input signals when charging:

[0042] 1. Current and line voltage (SV) of power supply 1, and closed and tripped positions (GOOSE) of power supply 1 circuit breaker (1DL).

[0043] 2. Current and line voltage (SV) of power supply 2; closed and tripped positions (GOOSE) of power supply 2 circuit breaker (2DL);

[0044] 3. 3DL combined position, skip position (GOOSE);

[0045] 4. Bus voltages (SV) of I and II.

[0046] Due to the special wiring method, in substations with internal bridge wiring and busbar protection, the operation of the main transformer protection and the bus differential protection will cause the automatic transfer switch to discharge, thus blocking the automatic transfer switch. The input method uses GOOSE networking.

[0047] Based on the charging and discharging modes of automatic transfer switch (ATS) devices, this embodiment proposes a test device for ATS devices in smart substations. This device meets the testing requirements of the IEC 61850 standard for optical digital ATS devices in smart substations, and also satisfies the testing requirements of traditional conventional substation ATS devices. It can be used for testing ATS devices in various types of substations, protecting manufacturers' factory inspection tests of ATS devices, and for verification tests of ATS devices, thus broadly serving various ATS testing scenarios. Figure 2 As shown, the system includes a test assembly and an analog power source assembly installed in a housing. The test assembly includes a main control board 1, a network port expansion board 2, and a human-machine interface unit 3. The main control board 1 is connected to the automatic transfer switch under test via the optical network port of the network port expansion board 2. The main control board 1 is also connected to the human-machine interface unit 3. The analog power source assembly includes a current amplifier board 4 and a voltage amplifier board 5. Both the current amplifier board 4 and the voltage amplifier board 5 are connected to the main control board 1 via a signal backplane 6. The main control board is configured to perform the following functions:

[0048] Waiting for and acquiring external data from human-computer interaction unit 3;

[0049] If the acquired external data is the main wiring diagram parameters for automatic transfer switch, the main wiring diagram is generated based on the automatic transfer switch main wiring diagram parameters and sent to the human-machine interaction unit 3;

[0050] If the acquired external data is an SCD file, the connection relationship of each device in the smart substation is obtained by parsing the SCD file, waiting for the backup automatic transfer IED selection command, and establishing an association between the selected backup automatic transfer and the corresponding circuit breaker in the main wiring diagram according to the backup automatic transfer IED selection command.

[0051] If the acquired external data is an analog control command, the current amplifier board 4 and / or voltage amplifier board 5 are controlled to generate the corresponding analog quantity according to the analog control command. The corresponding SV message is generated according to the analog quantity and then sent to the backup automatic transfer device under test through the corresponding optical network port of the network port expansion board 2.

[0052] Wait for and receive SV and / or GOOSE packets from network port expansion board 2, parse the SV and / or GOOSE packets and generate the corresponding report.

[0053] like Figure 3 As shown, the main control board 1 in this embodiment includes a CPU and an FPGA connected to each other. In this embodiment, a PCIe channel and a gigabit network channel are provided between the CPU and the FPGA. The FPGA is connected to the AD converter, the current amplifier board 4, and the voltage amplifier board 5 through an AD converter. The FPGA is also connected to the backup automatic transfer device under test through the optical network port of the network port expansion board 2. When generating the corresponding SV message according to the analog signal, the CPU and FPGA inside the main control board 1 perform the following data processing:

[0054] The FPGA waits for and acquires data from the AD converter. After data preprocessing, it sends the data to the CPU. Data preprocessing generally includes four steps: data cleaning, data integration, data transformation, and data reduction, in order to remove impurities and ensure the accuracy of the final result. These four steps are the conventional methods used in this field, and their specific processes will not be described in detail here.

[0055] The CPU waits for and receives data from the FPGA, compresses and packages the data to generate SV messages, and updates the SV message data in the storage area at preset time intervals. In this embodiment, the time interval is 250us.

[0056] The CPU sends the SV message data packet information to the FPGA via the EMA BUS. The FPGA transfers the corresponding message data from the storage area to the FPGA's internal cache via the PCIe channel according to the data packet information. Then, the message data in the FPGA's internal cache is sent to the backup automatic transfer device under test through the optical network port of the network port expansion board 2. Specifically, in this embodiment, the FPGA includes SV message sending ports that correspond one-to-one with the optical network ports of the network port expansion board 2. Each SV message sending port corresponds to two sending buffer areas in the FPGA's internal cache. The message data in these two sending buffer areas is sent to the corresponding SV message sending port in a ping-pong mode.

[0057] Correspondingly, while waiting for and receiving SV and / or GOOSE messages from network port expansion board 2, the CPU and FPGA inside main control board 1 perform the following data processing:

[0058] The FPGA waits for and receives SV and / or GOOSE messages from the network port expansion board 2, caches them in the FPGA's internal cache, and then sends the SV and / or GOOSE message data in the FPGA's internal cache to the CPU through the uplink network port via the gigabit network channel.

[0059] Based on the aforementioned working principle of the automatic transfer switch, testing it requires at least 7 different data transmission interfaces. In this embodiment, the network port expansion board 2 is equipped with 8 optical network port channels and corresponding LC optical Ethernet ports to meet the requirements. In addition, the network port expansion board 2 is also equipped with 4 FT3 output interfaces and a GPS module to meet the needs of future functional expansion.

[0060] like Figure 3 As shown, in this embodiment, the human-machine interaction unit 3 includes a touch screen, a keypad, and an industrial control board. Both the touch screen and the keypad are connected to the industrial control board, which is also connected to the main control board. The touch screen uses an LCD panel. The industrial control board controls the touch screen to display the interface and perform human-machine interaction functions. The keypad converts display signals, transferring LVDS signals to the LCD panel to perform button functions and to display the device's operating status indicator lights. The hardware used to implement these functions is all existing technology; therefore, the principles and specific implementation processes for achieving these functions will not be elaborated upon here.

[0061] To facilitate interaction between the experimental device and other equipment, a base plate is provided on the casing of the experimental device in this embodiment. The main control board 1, the network port expansion board 2, and the human-machine interface unit 3 are all connected to the corresponding external interfaces on the base plate. The external interfaces on the base plate include 8 optical network port circuits, 1 optical B-code receiver, 1 optical B-code transmitter, 1 485 interface electrical B-code transmitter, 1 FT3 transmitter, 1 FT3 receiver, 1 100M communication network port, 1 100M communication optical network port, 3 USB interfaces, and 1 debugging serial port. This greatly improves the applicability of the experimental device.

[0062] In this embodiment, the current amplifier board 4 includes 6 current power sources, and the voltage amplifier board 5 includes 8 voltage amplitude and power amplification circuits, two of which are used for auxiliary DC power. To realize the functions of the current amplifier board 4 and the voltage amplifier board 5, as follows... Figure 2As shown, in this embodiment, the analog power source component also includes a current amplifier main power supply board 7 and a rectifier filter board 8. The current amplifier main power supply board 7 is equipped with a high power density DC-DC circuit, and the output main power supply voltage is ±12.0V, serving as the positive and negative main power supply for the current amplifier on the current amplifier board 4. The rectifier filter board 8 rectifies and filters the power supply, and distinguishes between AC and DC input power. When DC voltage is input, the main circuit path is cut off to protect the transformer in the subsequent circuit. The circuits that implement the relevant functions are common solutions in the art, such as using a filter circuit for rectification and filtering, and using an LC circuit to isolate the DC power supply, etc. The structure of the relevant circuits will not be described in detail here.

[0063] In this embodiment, the main power supply board 7 of the current amplifier is connected to the rectifier filter board 8 through the first channel of the signal backplane 6, and the rectifier filter board 8 is connected to the power supply terminals of the current amplifier board 4 and the voltage amplifier board 5 through the second channel of the signal backplane 6. Thus, the power supply of the main power supply board 7 of the current amplifier provides power to the current amplifier board 4 and the voltage amplifier board 5 after power processing, thereby improving the working effect of the current amplifier board 4 and the voltage amplifier board 5.

[0064] like Figure 2 As shown in this embodiment, the analog power source component further includes an input board and an output board, which are connected to the main control board 1 via a signal backplane 6. The input and output boards specifically refer to the input board and the output board. The input board receives the automatic transfer switch (ATS) operation signal, and the output board outputs the switch position signal to the ATS. The structure of the input and output boards is known to those skilled in the art and will not be described further here.

[0065] like Figure 4 As shown, this embodiment also proposes a test method for automatic transfer switching in intelligent substations, applied to the test device for automatic transfer switching in intelligent substations in this embodiment, including the following steps:

[0066] 1) Set the backup automatic transfer main wiring diagram parameters through the interface of the human-machine interaction unit 3, and wait for the main wiring diagram to be displayed. For example, input the single bus section internal bridge wiring, with one incoming line per bus section, and name the equipment. After the human-machine interaction unit 3 sends the relevant backup automatic transfer main wiring diagram parameters to the main control board, the main control board 1 generates the main wiring diagram based on these backup automatic transfer main wiring diagram parameters and sends it to the human-machine interaction unit 3. The main wiring diagram displayed on the interface of the human-machine interaction unit 3 is as follows: Figure 5 As shown;

[0067] 2) Import the SCD file into the test device, select the standby automatic transfer IED to be tested through the interface of the human-machine interaction unit 3, and wait for the selected standby automatic transfer IED to establish an association with the corresponding circuit breaker in the main wiring diagram. After the SCD file is imported, the main control board 1 parses the SCD file to obtain the connection relationship of each device in the smart substation, and searches for associated IEDs with virtual terminal connection relationships with the standby automatic transfer IED to be tested according to the connection relationship of each device in the smart substation, and establishes an association relationship between the search results and the circuit breaker in the main wiring diagram.

[0068] 3) Select the backup automatic transfer logic, the simulated object, and the switch or analog quantity of each simulated object through the interface of the human-machine interaction unit 3; the main control board 1 generates the corresponding SV message according to the selected backup automatic transfer logic and the switch or analog quantity of each simulated object, and prepares to send it to the backup automatic transfer device under test.

[0069] 4) Connect the optical network port of the test device to the optical fiber of the backup automatic transfer device, trigger the test through the set switch quantity and analog quantity, and record the bus undervoltage and circuit breaker action time according to the test report generated by the test device after the test is completed.

[0070] In step 3), taking the selection of automatic transfer switch (ATS) logic as incoming line ATS as an example, power supply 1, power supply 2, bus tie, bus I, and bus II can be selected as simulation objects on the main wiring diagram. The circuit breaker tripping monitoring, closing position, and the bus voltage, incoming line voltage, and incoming line current of each bay's intelligent terminal are associated with the status output signals of the simulated circuit breaker. The status definitions and associated signal data definitions for each object are as follows:

[0071] Power Supply 1: IA = IB = IC = 1A, Input Voltage UL = 57V, TWJ = 0, KKJ = 1

[0072] Power Supply 2: IA = IB = IC = 0, Input Voltage UL = 57V, TWJ = 1, KKJ = 0

[0073] Mother 3DL: TWJ=0, KKJ=1

[0074] Busbar I, Busbar II: UA = UB = UC = 57.7V

[0075] Step 4) involves triggering the test using pre-set switch and analog quantities, specifically: waiting for the backup automatic transfer device to complete charging; and, once the backup automatic transfer device is fully charged, for bus I and bus II, the backup automatic transfer device will perform a short-delay transfer (1DL) and a long-delay transfer (2DL). Therefore, by clicking on the I and II busbars of the interface of the human-machine interaction unit 3, simulated control commands for the target main transformer action in the main wiring diagram are issued. Specifically, when clicking on the I busbar, the main control board 1 controls the current and voltage in the corresponding channels of the current amplifier board 4 and the voltage amplifier board 5 to change, thereby generating the corresponding SV message indicating #1 main transformer action, which is short-delay standby automatic transfer switch 1DL and 3DL, and long-delay combined 2DL. When clicking on the II busbar, the main control board 1 controls the current and voltage in the corresponding channels of the current amplifier board 4 and the voltage amplifier board 5 to change, thereby generating the corresponding SV message indicating #2 main transformer action, standby automatic transfer switch discharge. After clicking on the I and II busbars of the interface of the human-machine interaction unit 3, the test device waits for the selected standby automatic transfer switch to obtain feedback data and generate a test report. Specifically, the main control board 1 parses the SV message and / or GOOSE message of the standby automatic transfer switch being tested, extracts the information in the SV message and / or GOOSE message, and generates a test report based on this information. The content is as follows: Figure 5 As shown, it includes fault types, voltage and current conditions of different lines, and the switching status of each switch.

[0076] In summary, this invention provides all the optical ports required by the automatic transfer switch (ATS) device, making it more economical and convenient compared to the traditional method of using multiple optical digital testers. Furthermore, it can record ATS feedback information and generate test reports, eliminating the need for multiple operators, thus saving manpower and improving the success rate and accuracy of the test.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A test device for automatic switching on standby in intelligent substations, characterized in that, The system includes a test component and an analog power source component. The test component includes a main control board (1), a network port expansion board (2), and a human-machine interaction unit (3). The main control board (1) is connected to the backup automatic transfer device under test through the optical network port of the network port expansion board (2). The main control board (1) is also connected to the human-machine interaction unit (3). The analog power source component includes a current amplifier board (4) and a voltage amplifier board (5). The current amplifier board (4) and the voltage amplifier board (5) are both connected to the main control board (1) through a signal backplane (6). The main control board (1) includes an FPGA. The FPGA is connected to the backup automatic transfer device under test through the optical network port of the network port expansion board (2). The FPGA includes SV message sending ports that correspond one-to-one with the optical network ports of the network port expansion board (2). Each SV message sending port corresponds to two sending buffers in the internal buffer of the FPGA. The message data in the two sending buffers is sent to the corresponding SV message sending port in ping-pong mode. The main control board is configured to perform the following functions: Waiting for and acquiring external data from the human-computer interaction unit (3); If the main wiring diagram parameters are for standby automatic transfer, generate the main wiring diagram based on the standby automatic transfer main wiring diagram parameters and send it to the human-machine interaction unit (3); If it is an SCD file, the connection relationship of each device in the smart substation is obtained by parsing the SCD file, waiting for the backup automatic transfer IED selection instruction, and establishing an association between the selected backup automatic transfer and the corresponding circuit breaker in the main wiring diagram according to the backup automatic transfer IED selection instruction; If it is an analog control command, the current power amplifier board (4) and / or voltage power amplifier board (5) are controlled to generate the corresponding analog quantity according to the analog control command, and the corresponding SV message is generated according to the analog quantity, and then sent to the backup automatic transfer device under test through the corresponding optical network port of the network port expansion board (2). Wait for and receive SV and / or GOOSE messages from the network port expansion board (2), parse the SV and / or GOOSE messages and generate the corresponding report.

2. The test device for automatic switching of backup power in intelligent substations according to claim 1, characterized in that, The main control board (1) also includes a CPU connected to the FPGA. The FPGA is connected via an AD converter, a current amplifier board (4), and a voltage amplifier board (5). When generating the corresponding SV message based on the analog quantity: The FPGA waits for and receives data from the AD converter, and after data preprocessing, sends it to the CPU; The CPU waits for and receives data from the FPGA, compresses and packages the data to generate SV messages, and updates the SV message data in the storage area at preset time intervals. The CPU sends the data packet information of the SV message to the FPGA. The FPGA transfers the corresponding message data from the storage area to the internal cache of the FPGA through the PCIE channel according to the data packet information. Then, the message data in the internal cache of the FPGA is sent to the backup automatic transfer device under test through the optical network port of the network expansion board (2).

3. The test device for automatic switching of backup power in intelligent substations according to claim 2, characterized in that, While waiting for and receiving SV and / or GOOSE messages from the network port expansion board (2): The FPGA waits for and receives SV messages and / or GOOSE messages from the network port expansion board (2), caches them in the FPGA's internal cache, and then sends the SV message and / or GOOSE message data in the FPGA's internal cache to the CPU through the uplink network port.

4. The test device for automatic switching of backup power in intelligent substations according to claim 1, characterized in that, The human-computer interaction unit (3) includes a touch screen, a button board and an industrial control board. The touch screen and the button board are both connected to the industrial control board, and the industrial control board is connected to the main control board.

5. The test device for automatic switching of backup power in intelligent substations according to claim 1, characterized in that, The analog power source assembly also includes a current amplifier main power supply board (7) and a rectifier filter board (8). The current amplifier main power supply board (7) is connected to the rectifier filter board (8) through the first channel of the signal backplane (6), and the rectifier filter board (8) is connected to the power supply terminals of the current amplifier board (4) and the voltage amplifier board (5) through the second channel of the signal backplane (6).

6. The test device for automatic switching of backup power in intelligent substations according to claim 1, characterized in that, The network port expansion board (2) is also equipped with a GPS module.

7. A test method for automatic transfer switching in a smart substation, applied to the test apparatus for automatic transfer switching in a smart substation as described in any one of claims 1 to 6, characterized in that, Includes the following steps: 1) Set the main wiring diagram parameters for automatic transfer switch via the interface of the human-computer interaction unit (3) and wait for the main wiring diagram to be displayed; 2) Import the SCD file into the test device, select the standby automatic transfer IED to be tested through the interface of the human-machine interaction unit (3), and wait for the selected standby automatic transfer to establish an association with the corresponding circuit breaker in the main wiring diagram. 3) Select the simulated object and the switch or analog quantity of each simulated object through the interface of the human-computer interaction unit (3); 4) Connect the optical network port of the test device to the optical fiber of the backup automatic transfer device, trigger the test through the set switch quantity and analog quantity, and record the bus undervoltage and circuit breaker action time according to the test report generated by the test device after the test is completed.

8. The test method for automatic switching of backup power in a smart substation according to claim 7, characterized in that, The switching or analog quantities in step 3) specifically include: the circuit breaker tripping monitoring and closing position of each bay's intelligent terminal, as well as the bus voltage, incoming line voltage, and incoming line current of the merging unit.

9. The test method for automatic switching of backup power in a smart substation according to claim 7, characterized in that, Step 4) involves triggering the test using pre-set switch and analog quantities, specifically including: waiting for the automatic transfer switch to finish charging, sending the simulated control command of the target main transformer action in the main wiring diagram through the interface of the human-machine interaction unit (3), and waiting for the test device to obtain the feedback data of the selected automatic transfer switch and generate a test report.

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