A replacement maintenance test device and method based on local protection

Abstract

The present invention provides a replaceable maintenance test device and method based on local protection, the device includes a tested line protection device, a tested main transformer sub-machine, and a tested busbar sub-machine; and also includes a replaceable maintenance trolley and a test device. The tested line protection device, the tested main transformer sub-machine, and the tested busbar sub-machine are horizontally installed in sequence on the upper part of the replaceable maintenance trolley, and the test device is installed on the lower part of the replaceable maintenance trolley. The test device is connected to the tested line protection device, the tested main transformer sub-machine, and the tested busbar sub-machine through signal lines. It is used for replaceable maintenance of substation equipment. According to the test requirements of "replaceable maintenance" of local protection devices, the detection platform can perform connection tests on local line protection, local main transformer protection, and local busbar protection.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent substations, and in particular to a replacement maintenance and testing device and method based on local protection. Background Art

[0002] The concept of local relay protection devices is a new technology and new direction for the power industry organized and developed by the State Grid Dispatching Center in recent years. The local protection installation method of smart substations has changed the operation and maintenance mode of relay protection. When there is a failure or abnormality in the on-site equipment, the replacement maintenance center will be notified, and after the spare equipment is selected and inspected and qualified, it will be replaced on-site. The equipment inspection work is completed at the replacement maintenance center, and only loop inspection and whole group inspection are carried out on-site.

[0003] The implementation form of the local protection device also puts forward new requirements for the local protection detection equipment. The protection detection equipment of the smart substation can no longer fully meet the detection requirements of the local protection device.

[0004] In traditional substations, the protection device test equipment outputs analog voltage and current and receives hard contact switch information. In smart substations, the protection device test equipment outputs digital information and receives digital information. After the protection device is localized, the transformer protection sub-machine and busbar protection sub-machine receive local analog signals and digital ring network protocol signals of other interval protections, requiring simultaneous output testing of analog and digital quantities.

[0005] The existing test equipment for busbars cannot conduct a comprehensive and integrated test on the local protection device. In view of the test requirements for the "replacement maintenance" of the local protection device, combined with the technical characteristics of the local protection, the test analysis is carried out, and a technical solution for replacement maintenance is proposed. The local device is tested on-site to restore the local device, and the local device is fully tested and automated. The quality of the local relay protection device is accurately evaluated to ensure the safe and stable operation of the power system. In view of the operating characteristics of the local protection device, the quality of the local protection device is strictly controlled, and the maintenance configuration management of the replaceable local protection device is improved. Therefore, to complete the test of the local protection device, an integrated local device-specific detection device is required.

[0006] The local secondary equipment is a combination of technology and standards, which will open up a new model for substation design, construction, operation and maintenance. The local protection devices mainly include three types: local line protection devices, local main transformer protection sub-machines, and local busbar protection sub-machines. The implementation form of the local protection device also puts forward new requirements for the local protection detection equipment. The protection detection equipment of the smart substation can no longer fully meet the local protection device detection requirements. A hardware platform with analog quantity, digital quantity, ring network protocol, time synchronization and other functions is required, and a software platform with automatic testing and other functions is required. It is a dedicated detection system for local devices. Summary of the invention

[0007] In order to solve the technical problems in the background technology, the present invention provides a replaceable maintenance test device and method based on local protection, which is used for replaceable maintenance of substation equipment. According to the testing requirements of "replaceable maintenance" of local protection devices, the detection platform can perform connection tests on local line protection, local main transformer protection and local busbar protection.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A replaceable maintenance test device based on local protection comprises a tested line protection device, a tested main transformer sub-machine, and a tested busbar sub-machine; it also comprises a replaceable maintenance trolley and a test device.

[0010] The line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test are horizontally installed in sequence on the upper part of the replaceable maintenance trolley, and the test device is installed on the lower part of the replaceable maintenance trolley. The test device is connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test through signal lines.

[0011] Furthermore, the replaceable maintenance trolley is a box-type structure, divided into two layers, with multiple running wheels at the bottom, the upper layer is placed with the tested line protection device, the tested main transformer sub-machine, and the tested busbar sub-machine, and the lower layer is placed with the test device.

[0012] Furthermore, the testing device includes a testing component, a relay switching device, an optoelectronic switch and a computer, and the testing component includes a mainboard module, a current detection module, a voltage detection module, a digital communication module and a switch input and output module, and the current detection module, the voltage detection module, the digital communication module and the switch input and output module are all connected to the mainboard module through a communication method.

[0013] Furthermore, the external ports of the current detection module and the voltage detection module are connected to the relay switching device, and the output ports of the relay switching device are respectively connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test through aviation plugs.

[0014] Furthermore, the external optical port of the digital communication module is connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test respectively through the ring network protocol and the 9-2\Goose protocol.

[0015] Furthermore, the external port of the switch input and output module is a trip contact signal point, which is respectively connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test through signal lines.

[0016] A replacement maintenance test method based on local protection includes the following:

[0017] 1) The mainboard module includes FPGA and ARM to form the mainboard system. ARM communicates with the computer through the Ethernet communication protocol to obtain the instructions and data information sent by the computer. ARM sends the received instructions to the mainboard FPGA, and sends the received data information to the mainboard FPGA after logical calculation. The mainboard FPGA performs command operations such as data processing and allocation and optical port data configuration, and sends them to the FPGA of each module through the mainboard FPGA. The FPGA of each module receives the data information and clock information provided by the mainboard FPGA, and converts the data information into a sampling rate of 2000 points, a maximum of 8000 points, and a sine wave output or a switch output;

[0018] 2) At the same time, the mainboard module has a timing receiving circuit to receive external timing signals, and send the timing signals to the FPGAs of other modules through FPGA to ensure that each module references the same clock source. The analog module and the digital module reference the same clock source. For each second pulse information, FGPA will output the analog voltage and current phase and the digital voltage and current phase to ensure that the analog output and digital output phase are synchronized;

[0019] The initial phase of analog output is a1, the initial phase of digital output is b1, and the ring network protocol delay is c1 us;

[0020] a1=b1-(c1 / 20000)x360

[0021] 3) Similarly, each module FGPA will timestamp the received 9-2, Goose, ring network protocol, and switch input information, parse and extract it, and send the information to the mainboard FPGA, which will provide it to ARM for logic processing and form a closed-loop test, record the action time of the protection device, etc., and feed back the real-time data or measurement results to the computer;

[0022] Mainboard FPGA sends instructions:

[0023] 9-2 Transmission and optical port, group number configuration;

[0024] 9-2 Receiving and optical port, group number configuration;

[0025] Goose transmission and optical port, group number configuration;

[0026] Goose receiving and optical port, group number configuration;

[0027] Ring network protocol transmission and optical port configuration;

[0028] 9-2 and Goose at the same time;

[0029] Operation on switch quantity;

[0030] Operations on analog quantities;

[0031] Simultaneous analog and digital quantity mode: Digital quantity includes: 9-2, Goose, and ring network protocols.

[0032] The replacement maintenance test method based on local protection comprises the following steps:

[0033] Step 1: Classify the equipment in the warehouse and mark the QR code information;

[0034] Step 2: Take the equipment from the warehouse and place it on the local testing platform for automatic connection and fixation;

[0035] Step 3: Automatically load the device model test template from the test template library by scanning the QR code information. The test template library should be a full range of test item templates customized according to the maintenance procedures;

[0036] Step 4: Download the file, read the device information through MMS, and perform verification and comparison, including: fixed value verification, configuration file verification, and model verification;

[0037] Step 5: One-button automatic test: SV point-to-point, GOOSE point-to-point, open-in and open-out transmission; Send analog quantity to read remote signal to realize closed-loop point-to-point, and realize closed-loop point-to-point test of switch quantity information by sending remote control command and receiving telemetry information; Protect logic verification, read fixed value pressure plate information for one-button automatic test;

[0038] Step 6: Automatically generate test reports and statistical analysis.

[0039] In described step 4, file comparison is by hash table method, and the key code value of backup file is mapped to a position in table to access record, to accelerate the speed of search. Utilize hash table method principle that GOOSE releases, GOOSE subscribes, SV releases, SV subscribes and the flag bit of CRC element in backup file 1 are stored in array respectively, and GOOSE releases, GOOSE subscribes, SV releases, SV subscribes and the flag bit of CRC element consistent with backup file 1 in backup file 2 file are stored in another array respectively simultaneously. Compare the corresponding elements in the corresponding flag bit array in two files respectively, thereby judge whether backup file is consistent.

[0040] In the local protection logic test, the component protection needs to output analog quantity and ring network protocol / special protocol synchronously for logic testing, and the analog quantity and digital quantity are output synchronously. The mainboard module that realizes parameter control sends parameters to the analog quantity office and the digital quantity office at the same time. The analog quantity board and the digital quantity board have independent FGPA programs, and independently perform sine wave calculations. The analog quantity output board FPGA and the digital quantity output board FPGA reference the same clock source. FGPA controls the analog quantity phase and digital quantity phase output. Every time a second pulse information is received, the analog quantity and digital quantity initial phase are reset. The hardware inherent delay of the analog quantity output board and the digital quantity output board is compensated by hardware to ensure the phase synchronization of the analog quantity output and the digital quantity output. The initial phase of the analog quantity output is a1, the initial phase of the digital quantity output is b1, and the ring network protocol delay is c1 us; a1=b1-(c1 / 20000)x360.

[0041] The local protection private network test is a test of SV uniformity, abnormal statistics, SV consistency, GOOSE real-time performance, and GOOSE consistency. The present invention adopts synchronization method and interpolation recursion method to achieve it.

[0042] It also includes network anomaly simulation technology. The system adds ring network protocol output, realizes ring network protocol anomaly simulation output according to SV / GOOSE anomaly simulation mechanism, performs sequence number control when packaging messages to realize ring network message frame loss and sequence error anomaly simulation, realizes ring network message sending interval test by sending timing control, and simulates ring network delay anomaly by changing delay parameters and associated phase values.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The local protection installation mode of the smart substation changes the operation and maintenance mode of the relay protection. If the on-site equipment fails or is abnormal, the spare equipment is selected. After the replacement maintenance and testing device based on the local protection of the present invention is inspected and qualified, the replacement operation can be carried out on site. After the replacement, only the loop detection and the whole group detection need to be carried out on site;

[0045] 2. This test system adopts a movable trolley-type test platform for integrated testing, which is convenient for equipment movement;

[0046] 3. By means of relay switching, the same test device is used to switch the three devices under test according to the needs;

[0047] 4. This test system uses a high-precision core processing unit to realize digital message transmission, complete data transmission and reception processing in parallel, realize zero-delay processing between multiple channels, ensure reliable data transmission and reception, and thus ensure reliable detection of secondary equipment. This test system can realize ring network protocol analog output and realize analog and digital synchronous output function.

[0048] 5. This test system can realize the analog output of the ring network protocol and the synchronous output of analog and digital quantities; this test system realizes a variety of synchronization methods, including GPS, IRIGB, and IEEE1588 timing schemes. Among them, the IEEE1588 master-slave clock synchronization accuracy can reach hundreds of nanoseconds. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a trolley-type structural diagram of the replacement maintenance and testing device based on local protection of the present invention;

[0050] Figure 2 is an electrical structure diagram of the test device of the present invention;

[0051] Figure 3 is a system connection structure diagram of the test device of the present invention;

[0052] Figure 4 It is an electrical structure diagram of the mainboard module of the test assembly of the present invention;

[0053] Figure 5 It is an electrical structure diagram of the current detection module and the voltage detection module of the test assembly of the present invention;

[0054] Figure 6 is an electrical structure diagram of a digital communication module of a test assembly of the present invention;

[0055] Figure 7 It is an electrical structure diagram of the switch input and output module of the test assembly of the present invention;

[0056] Figure 8 is an electrical structure diagram of a relay switching device of a test assembly of the present invention;

[0057] Fig. 9 It is a replacement inspection flow chart based on local protection of the present invention;

[0058] Fig.10 The present invention is based on the local protection replacement maintenance test method process Figure 1 ;

[0059] Fig.11 The present invention is based on the local protection replacement maintenance test method process Figure 2 .

[0060] In the figure: 1-replaceable maintenance trolley 2-tested line protection device 3-tested main transformer sub-machine 4-tested busbar sub-machine 5-testing device 6-traveling wheel. DETAILED DESCRIPTION

[0061] The specific implementation modes provided by the present invention are described in detail below with reference to the accompanying drawings.

[0062] like Figure 1 As shown, a replaceable maintenance and testing device based on local protection includes a replaceable maintenance trolley 1, a tested line protection device 2, a tested main transformer sub-machine 3, a tested busbar sub-machine 4 and a testing device 5. The tested line protection device 2, the tested main transformer sub-machine 3 and the tested busbar sub-machine 4 are all equipment of the original intelligent substation.

[0063] The replaceable maintenance trolley 1 is a box-type structure, divided into two layers, with multiple running wheels 6 at the bottom. The upper layer is placed with the line protection device 2, the main transformer sub-machine 3, and the busbar sub-machine 4 under test, and the lower layer is placed with the test device 5. The line protection device 2, the main transformer sub-machine 3, and the busbar sub-machine 4 under test are horizontally installed in sequence on the upper part of the replaceable maintenance trolley 1, and the test device 5 is installed on the lower part of the replaceable maintenance trolley 1. The test device 5 is connected to the line protection device 2, the main transformer sub-machine 3, and the busbar sub-machine 4 under test through signal lines.

[0064] like Figure 2-3 As shown, the test device 5 includes a shell and electrical components inside the shell, the electrical components include a test component, a relay switching device, an optoelectronic switch and a computer, the test component includes a main board module, a current detection module, a voltage detection module, a digital communication module and a switch input and output module, the current detection module, the voltage detection module, the digital communication module and the switch input and output module are all connected to the main board module via a bus communication method.

[0065] The external ports of the current detection module and the voltage detection module are connected to the relay switching device, and the output ports of the relay switching device are respectively connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test through aviation plugs.

[0066] The external optical port of the digital communication module is connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test through the ring network protocol and the 9-2\Goose protocol.

[0067] The external port of the switch quantity input and output module is a trip contact signal point, which is respectively connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test through signal lines.

[0068] like Figure 4 As shown, the mainboard module includes a SOC on-chip CPU module (including FPGA+ARM) and an Ethernet module connected thereto. The mainboard module is connected to a computer via the TCP / IP protocol of an Ethernet port. The computer is connected to an optical fiber via an optoelectronic switch, and is connected to the line protection device under test, the main transformer sub-machine under test, and the bus sub-machine under test via optical fiber.

[0069] like Figure 5 As shown in the figure, it is the internal circuit structure diagram of the current detection module and the voltage detection module. The internal circuit structure of the current detection module and the voltage detection module is the same. The voltage or current signal enters the power amplifier through the external port, and then enters the FPGA for processing after analog-to-digital conversion, and then sends the signal to the main board module through the communication port.

[0070] like Figure 6 As shown, it is the internal circuit structure diagram of the digital communication module, including the FPGA chip and the optical communication interface connected thereto, the 100Mbps optical transceiver module, and the 1000Mbps optical transceiver module. The digital quantity interface of the tested line protection device, the tested main transformer sub-machine, and the tested busbar sub-machine is tested through the optical communication interface.

[0071] like Figure 7 As shown, it is the internal circuit structure diagram of the switch quantity input and output module, including an FPGA chip. The FPGA chip is connected to the external switch quantity input interface and switch quantity output interface through optical coupling isolation. The switch quantity input interface and the switch quantity output interface are used for connection testing of the tripping contact signals of the tested line protection device, the tested main transformer sub-machine, and the tested busbar sub-machine.

[0072] like Figure 8 The figure shows the electrical connection structure diagram of the relay switching device. The relay switching device is a universal relay, which utilizes the normally open or normally closed contacts of the relay to perform switching tests on the voltage or current detection signals of the tested line protection device, the tested main transformer sub-machine, and the tested busbar sub-machine.

[0073] The local replacement maintenance test system adopts a movable detection platform with pulleys. The detection platform can perform connection tests on local line protection, local main transformer protection, and local busbar protection. Only one protection device can be tested at a time, and simultaneous testing of multiple devices is not supported.

[0074] The test system uses prefabricated aviation plug connections. The aviation plug wiring and protection device adopt automatic connection method. The automatic connection is compatible with a variety of aviation plug connectors and has high connection efficiency, reflecting the advantages of automatic connection.

[0075] The test system includes output components, optoelectronic switches, relay switching devices, computers, optical cables, electrical cables and other components.

[0076] Output components, the core part of the test system:

[0077] Equipped with 6-channel 20A high-precision analog current output and 6-channel 120V high-precision analog voltage output;

[0078] Equipped with 4 pairs of 100M optical fiber interfaces, capable of sending and receiving 61850-9-2 messages and Goose messages;

[0079] Equipped with 4 pairs of Gigabit optical fiber interfaces, capable of sending and receiving ring network protocol messages;

[0080] Equipped with 8-way switch input interface and 8 pairs of switch output interface, used to test the action time of protection device;

[0081] It also has optical IRIG-B, GPS, and IEEE1588 timing interfaces.

[0082] The relay switching device is a switching device used for switching between the output component and the local protection device under test. When the device under test is selected, the relay switching device switches the analog voltage and current wiring of the output component to the corresponding interface of the device under test. The relay switching device and the device under test are connected through an aviation plug.

[0083] The photoelectric switch is a communication conversion device used between the output component and the computer, and is also used for communication conversion between the local protection device under test and the computer.

[0084] The computer is the software carrier of the local replaceable maintenance platform. The test software system runs in the computer, controlling the output components to output analog or digital messages according to the test logic, and also performs MMS communication with the local device under test.

[0085] A replacement maintenance test method based on local protection includes the following:

[0086] 1) The mainboard module includes FPGA and ARM to form the mainboard system. ARM communicates with the computer through the Ethernet communication protocol to obtain the instructions and data information sent by the computer. ARM sends the received instructions to the mainboard FPGA, and sends the received data information to the mainboard FPGA after logical calculation. The mainboard FPGA performs command operations such as data processing and allocation and optical port data configuration, and sends them to the FPGA of each module through the mainboard FPGA. The FPGA of each module receives the data information and clock information provided by the mainboard FPGA, and converts the data information into a sampling rate of 2000 points, a maximum of 8000 points, and a sine wave output or a switch output;

[0087] 2) At the same time, the mainboard module has a timing receiving circuit to receive external timing signals, and send the timing signals to the FPGAs of other modules through FPGA to ensure that each module references the same clock source. The analog module and the digital module reference the same clock source. For each second pulse information, FGPA will output the analog voltage and current phase and the digital voltage and current phase to ensure that the analog output and digital output phase are synchronized;

[0088] The initial phase of analog output is a1, the initial phase of digital output is b1, and the ring network protocol delay is c1 us;

[0089] a1=b1-(c1 / 20000)x360

[0090] 3) Similarly, each module FGPA will timestamp the received 9-2, Goose, ring network protocol, and switch input information, parse and extract it, and send the information to the mainboard FPGA, which will provide it to ARM for logic processing and form a closed-loop test, record the action time of the protection device, etc., and feed back the real-time data or measurement results to the computer;

[0091] Mainboard FPGA sends instructions:

[0092] 9-2 Transmission and optical port, group number configuration;

[0093] 9-2 Receiving and optical port, group number configuration;

[0094] Goose transmission and optical port, group number configuration;

[0095] Goose receiving and optical port, group number configuration;

[0096] Ring network protocol transmission and optical port configuration;

[0097] 9-2 and Goose at the same time;

[0098] Operation on switch quantity;

[0099] Operations on analog quantities;

[0100] Simultaneous analog and digital quantity mode: Digital quantity includes: 9-2, Goose, and ring network protocols.

[0101] like Figure 9-11 As shown, the replacement maintenance test method based on local protection includes the following steps:

[0102] Step 1: Classify the equipment in the warehouse and mark the QR code information;

[0103] Step 2: Take the equipment from the warehouse and place it on the local testing platform for automatic connection and fixation;

[0104] Step 3: Automatically load the device model test template from the test template library by scanning the QR code information. The test template library should be a full range of test item templates customized according to the maintenance procedures;

[0105] Step 4: File download, read device information through MMS, and perform verification and comparison, including: fixed value verification, configuration file verification, and model verification;

[0106] Step 5: One-button automatic test: SV point-to-point, GOOSE point-to-point, open-in and open-out transmission; Send analog quantity to read remote signal to realize closed-loop point-to-point, and realize closed-loop point-to-point test of switch quantity information by sending remote control command and receiving telemetry information; Protect logic verification, read fixed value pressure plate information for one-button automatic test;

[0107] Step 6: Automatically generate test reports and statistical analysis.

[0108] In described step 4, file comparison is by hash table method, and the key code value of backup file is mapped to a position in table to access record, to accelerate the speed of search. Utilize hash table method principle that GOOSE releases, GOOSE subscribes, SV releases, SV subscribes and the flag bit of CRC element in backup file 1 are stored in array respectively, and GOOSE releases, GOOSE subscribes, SV releases, SV subscribes and the flag bit of CRC element consistent with backup file 1 in backup file 2 file are stored in another array respectively simultaneously. Compare the corresponding elements in the corresponding flag bit array in two files respectively, thereby judge whether backup file is consistent.

[0109] In the local protection logic test, the component protection needs to output analog quantity and ring network protocol / special protocol synchronously for logic testing, and the analog quantity and digital quantity are output synchronously. The mainboard module that realizes parameter control sends parameters to the analog quantity office and the digital quantity office at the same time. The analog quantity board and the digital quantity board have independent FGPA programs, and independently perform sine wave calculations. The analog quantity output board FPGA and the digital quantity output board FPGA reference the same clock source. FGPA controls the analog quantity phase and digital quantity phase output. Every time a second pulse information is received, the analog quantity and digital quantity initial phase are reset. The hardware inherent delay of the analog quantity output board and the digital quantity output board is compensated by hardware to ensure the phase synchronization of the analog quantity output and the digital quantity output. The initial phase of the analog quantity output is a1, the initial phase of the digital quantity output is b1, and the ring network protocol delay is c1 us; a1=b1-(c1 / 20000)x360.

[0110] The local protection private network test is a test of SV uniformity, abnormal statistics, SV consistency, GOOSE real-time performance, and GOOSE consistency. The present invention adopts synchronization method and interpolation recursion method to achieve it.

[0111] It also includes network anomaly simulation technology. The system adds ring network protocol output, realizes ring network protocol anomaly simulation output according to SV / GOOSE anomaly simulation mechanism, performs sequence number control when packaging messages to realize ring network message frame loss and sequence error anomaly simulation, realizes ring network message sending interval test by sending timing control, and simulates ring network delay anomaly by changing delay parameters and associated phase values.

[0112] As an overall system management and testing software, the on-site replacement maintenance software includes warehouse spare parts management records, system authority access restrictions, template database management system, protection test system, point test system, file comparison test system and test report database management system.

[0113] The software architecture includes:

[0114] Toolbar;

[0115] Test item list column;

[0116] Test interface bar or test progress display bar;

[0117] Real-time data display area;

[0118] Equipment status display area;

[0119] Test result display area;

[0120] Software features include:

[0121] Enter the test system according to the access rights;

[0122] Test template management, test report management, automatic generation of test cases through QR code scanning, automatic testing, automatic generation of test reports, report management system;

[0123] File comparison test, fixed value file comparison test, configuration file comparison test, model file comparison test;

[0124] Single device one-button automatic test system (local protection device action logic test);

[0125] Install SV point-to-point, Goose point-to-point, and input-output point-to-point test systems;

[0126] Report management, forming a test acceptance report that includes all test items of replacement maintenance and complies with on-site acceptance.

[0127] The above embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above embodiments are conventional methods unless otherwise specified.

Claims

1. A test method for a replaceable maintenance test device based on local protection, the device comprising a line protection device to be tested, a main transformer sub-machine to be tested, and a busbar sub-machine to be tested; and also comprising a replaceable maintenance trolley and a test device; The line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test are horizontally installed in sequence on the upper part of the replaceable maintenance trolley, and the test device is installed on the lower part of the replaceable maintenance trolley. The test device is connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test through signal lines. It is characterized in that The testing method of the device includes the following: 1) The mainboard module of the test device includes a mainboard system composed of FPGA and ARM. ARM communicates with the computer through the Ethernet communication protocol to obtain the instructions and data information sent by the computer. ARM sends the received instructions to the mainboard FPGA, and sends the received data information to the mainboard FPGA after logical calculation. The mainboard FPGA performs data processing and distribution and command operations for optical port data configuration, and sends them to the FPGA of each module through the mainboard FPGA. The FPGA of each module receives the data information and clock information provided by the mainboard FPGA, and converts the data information into a sampling rate of 2000 points, a maximum of 8000 points, and a sine wave output or a switch output; 2) At the same time, the mainboard module is equipped with a timing receiving circuit to receive external timing signals, and send the timing signals to the FPGAs of other modules through FPGA to ensure that each module references the same clock source; the analog module and the digital module reference the same clock source, and for each second pulse information, the FGPA will output the analog voltage and current phase and the digital voltage and current phase to ensure the phase synchronization of the analog output and the digital output; The initial phase of analog output is a1, the initial phase of digital output is b1, and the ring network protocol delay is c1 us; a1= b1-(c1 / 20000)×360 3) Similarly, each module FGPA will timestamp the received 9-2, Goose, ring network protocol, and switch input information, parse and extract it, and send the information to the mainboard FPGA, which will provide it to ARM for logic processing and form a closed-loop test, record the action time of the protection device, and feed back the real-time data or measurement results to the computer; Mainboard FPGA sends instructions: 9-2 Transmission and optical port, group number configuration; 9-2 Receiving and optical port, group number configuration; Goose transmission and optical port, group number configuration; Goose receiving and optical port, group number configuration; Ring network protocol transmission and optical port configuration; 9-2 and Goose synchronization method; Operation on switch quantity; Operations on analog quantities; Analog and digital synchronization methods: Digital quantities include: 9-2, Goose, and ring network protocols; The testing method of the device comprises the following steps: Step 1: Classify the equipment in the warehouse and mark the QR code information; Step 2: Take the equipment from the warehouse and place it on the local testing platform for automatic connection and fixation; Step 3: Scan the QR code to automatically load the test template for the device model from the test template library. The test template library is a full range of test item templates customized according to the maintenance procedures; Step 4: Download the file, read the device information through MMS, and perform verification and comparison, including: fixed value verification, configuration file verification, and model verification; Step 5: One-button automatic test: SV point-to-point, GOOSE point-to-point, open-in and open-out transmission; Send analog quantity to read remote signal to realize closed-loop point-to-point, and realize closed-loop point-to-point test of switch quantity information by sending remote control command and receiving telemetry information; Protect logic verification, read fixed value pressure plate information for one-button automatic test; Step 6: Automatically generate test reports and statistical analysis; In the step 4, the file comparison uses a hash table method to map the key code value of the backup file to a position in the table to access the record to speed up the search; the hash table principle is used to store the flag bits of GOOSE release, GOOSE subscription, SV release, SV subscription and CRC elements in backup file 1 in an array, and the flag bits of GOOSE release, GOOSE subscription, SV release, SV subscription and CRC elements in backup file 2 that are consistent with backup file 1 are stored in another array; the corresponding elements in the corresponding flag bit arrays of the two files are compared in turn, so as to determine whether the backup files are consistent.

2. The testing method of a replacement maintenance test device based on local protection according to claim 1 is characterized in that: The test device includes a test component, a relay switching device, an optoelectronic switch and a computer. The test component includes a mainboard module, a current detection module, a voltage detection module, a digital communication module and a switch input and output module. The current detection module, the voltage detection module, the digital communication module and the switch input and output module are all connected to the mainboard module through a communication method.

3. A testing method for a replacement maintenance and testing device based on local protection according to claim 2, characterized in that: The external ports of the current detection module and the voltage detection module are connected to the relay switching device, and the output ports of the relay switching device are respectively connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test through aviation plugs.

4. The testing method of a replacement maintenance test device based on local protection according to claim 2 is characterized in that: The external optical port of the digital communication module is connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test through the ring network protocol and the 9-2\Goose protocol.

5. The testing method of a replacement maintenance and testing device based on local protection according to claim 2 is characterized in that: The external port of the switch quantity input and output module is a trip contact signal point, which is respectively connected to the line protection device under test, the main transformer sub-machine under test, and the busbar sub-machine under test through signal lines.

6. The testing method of a replacement maintenance test device based on local protection according to claim 1 is characterized in that: In the local protection logic test, the component protection requires the synchronous output of analog quantity and ring network protocol / special protocol for logic testing, and the synchronous output of analog quantity and digital quantity. The mainboard module that realizes parameter control sends parameters to the analog output board and the digital output board at the same time. The analog output board and the digital output board have independent FGPA programs and perform sine wave calculations independently. The FPGA of the analog output board and the FPGA of the digital output board reference the same clock source. FGPA controls the analog phase and digital phase output. Every time a second pulse information is received, the analog and digital initial phases are reset. The hardware inherent delay of the analog output board and the digital output board is compensated by hardware to ensure the phase synchronization of the analog output and the digital output. The initial phase of the analog output is a1, the initial phase of the digital output is b1, and the ring network protocol delay is c1 us; a1= b1-(c1 / 20000)×360.

7. The testing method of a replacement maintenance and testing device based on local protection according to claim 1 is characterized in that: It also includes network anomaly simulation technology. The system adds ring network protocol output, realizes ring network protocol anomaly simulation output according to SV / GOOSE anomaly simulation mechanism, performs sequence control on message group timing to realize ring network message frame loss and sequence error anomaly simulation, realizes ring network message sending interval test through sending timing control, and simulates ring network delay anomaly by changing delay parameters and associated phase values.

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