Security isolation detection method and device before testing of relay protection device

Abstract

The invention discloses a security isolation detection method and device before a relay protection device test, and aims to ensure effective security isolation of the relay protection device before the test so as to prevent power grid accidents caused by improper isolation, thereby improving the security and stability of a power grid. According to the method, a transformer substation configuration file is imported, a relay protection device is automatically identified and locked, a secondary safety measure isolation measure is generated, and a safety isolation detection strategy is formed according to a process layer and a station control layer information sequence. The device comprises a man-machine interaction module, a data interaction module, a logical operation module, a result evaluation module and a signal interface module, and can obtain and analyze SMV, GOOSE and MMS messages in real time, automatically evaluate the isolation state and provide a visual user interface. According to the method, the operation efficiency and the detection accuracy are improved, and the method has wide applicability and flexibility.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of intelligent substation relay protection automatic testing, and particularly relates to a safety isolation detection method and device for a relay protection device before testing. BACKGROUND

[0002] The relay protection device of a substation plays a crucial role in the power grid, as a key barrier for the safe and stable operation of the power grid, its performance directly affects the reliability and safety of the entire power grid. Before these devices are put into use, they must be tested in detail to ensure the accuracy and reliability of their configuration, circuit and functional logic. These tests are not limited to the initial installation stage, but also include routine tests during regular maintenance, periodic inspection and troubleshooting. However, during these operations, there are occasional misoperations, such as incorrectly accessing test intervals or incorrectly testing devices, which can cause the device to fail to perform its protection function. More seriously, if the device under test is not properly safety isolated before being directly tested for functionality, it can cause serious power grid accidents and thus pose a threat to the safe operation of the power grid. Therefore, it is an important technical requirement in the current power grid operation management to ensure that maintenance personnel can correctly connect and test the relay protection devices that need to be maintained and inspected, while automatically identifying and issuing warning prompts when attempting to connect devices in non-inspection intervals.

[0003] Although there are some solutions in the prior art that aim to improve the safety and accuracy of relay protection device testing, these solutions still have some deficiencies in certain aspects. For example, Chinese patent application file CN110829595B proposes a method and system for implementing safety isolation measures for the maintenance of relay protection equipment in intelligent substations. This invention provides an automated means to manage the safety isolation measures for the maintenance of relay protection equipment, however, this system may have limitations in certain key areas or specific application scenarios. For example, it may not achieve the best results in terms of real-time performance and comprehensiveness, or there is still room for improvement in the convenience of user operations. In addition, this system may have dependencies on specific hardware or network environments, limiting its applicability and flexibility in different substation environments. Therefore, further technological innovation is still needed to improve the functionality of these systems, to ensure more effective safety isolation detection before relay protection device testing, and thus to ensure the safe and stable operation of the power grid. SUMMARY

[0004] The application provides a safety isolation detection method and device before relay protection device testing, which aims to ensure effective safety isolation before relay protection device testing, thereby preventing power grid accidents caused by improper isolation and improving the safety and stability of the power grid.

[0005] The method comprises the following steps: importing a substation configuration file, determining a relay protection device object to be tested, and extracting relay protection device parameters; automatically identifying and locking the relay protection device; obtaining secondary safety isolation measures according to the device parameter information of the relay protection device; generating a process layer information sequence and a station control layer information sequence according to the secondary safety isolation measures; combining an AND-OR-NOT logic queue according to the process layer information sequence and the station control layer information sequence; connecting the relay protection device to be tested; and performing secondary safety isolation detection.

[0006] Preferably, the method automatically identifies and locks the relay protection device according to the IP address of the relay protection device and process layer information configuration.

[0007] Preferably, the method obtains a secondary safety isolation measure sequence according to the substation relay protection specification.

[0008] Preferably, the method provides corresponding requirements for the GOOSE message, SMV message and MMS message state of the relay protection device according to the secondary safety isolation measure sequence.

[0009] Preferably, the method generates a logic expression according to the state of the relay protection device, combines the logic expression, generates an AND-OR-NOT logic queue, and forms a safety isolation detection strategy.

[0010] The device executes the above method, and the device comprises: a man-machine interaction module that imports or displays parameters; a data interaction module that provides device parameter information; a logic operation module that generates a safety isolation detection strategy; a result evaluation module that evaluates a safety isolation state and generates a diagnosis result; a test control module that sends an excitation signal and receives a feedback signal; and a signal interface module that is communicatively connected to a device to be tested; wherein the logic operation module calculates signal data obtained from the data interaction module, feeds back state data after calculation to the test control module, and feeds back result data after calculation to the result evaluation module.

[0011] Preferably, the data interaction module sends a control command of the test control module to the signal interface module; receives a signal of the signal interface module, feeds back result data to the result evaluation module, and feeds back test data to the logic operation module.

[0012] Preferably, the signal interface module comprises a first signal interface module, a second signal interface module and a third signal interface module; wherein the first signal interface module is an optical Ethernet interface, accesses the process layer network of the relay protection device, and interacts with the process layer SMV data of the relay protection device; wherein the second signal interface module is an optical Ethernet interface, accesses the process layer network of the relay protection device, and interacts with the process layer GOOSE data of the relay protection device; wherein the third signal interface module is an electrical Ethernet interface, accesses the station control layer network of the relay protection device, and interacts with the station control layer MMS data of the relay protection device.

[0013] Preferably, the result evaluation module combines the safety isolation detection strategy, completes the diagnosis of the safety isolation state of the relay protection device, and feeds back the diagnosis result to the man-machine interaction module.

[0014] Preferably, the man-machine interaction module displays the diagnosis result.

[0015] The present application has the following beneficial effects:

[0016] 1. By automatically analyzing the substation configuration file and generating a detection strategy, manual operation is reduced, and the accuracy and efficiency of testing are improved.

[0017] 2. The SMV, GOOSE and MMS messages of the relay protection device can be acquired and analyzed in real time, ensuring the timeliness and reliability of the detection result.

[0018] 3. Through the logic operation and result evaluation module, the safety isolation state is automatically evaluated and diagnosed, effectively preventing misoperation and potential power grid accidents.

[0019] 4. The man-machine interaction module provides an intuitive interface, facilitating operation and monitoring, and improving user experience.

[0020] 5. Multiple network interfaces and configurations are supported, suitable for different relay protection devices and substation environments, enhancing the flexibility of the system. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a flowchart of the method of the present application;

[0022] Figure 2 is a system architecture diagram of the device of the present application. DETAILED DESCRIPTION

[0023] In order to facilitate those skilled in the art to understand and implement the present application, the present application will be further described in detail below in conjunction with examples, and it should be understood that the examples described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0024] Implementation 1

[0025] according to Figure 1 As shown, the safety isolation testing method for relay protection devices proposed in this invention includes the following steps:

[0026] 1. Import the substation configuration file, identify the relay protection device to be tested, and extract the relay protection device parameters:

[0027] The configuration files include SCD, CCD, and CID files. The SCD file describes the configuration information of all relay protection devices in the entire substation. After importing the SCD file of the substation, the test object can be determined according to the test requirements. Alternatively, the configuration information of the relay protection device can be obtained by importing its CCD and CID files.

[0028] In this implementation example, the relay protection device parameters include equipment parameter information, process layer configuration information, and station control layer configuration information. Therefore, the device parameters of the relay protection device under test can be extracted by importing and parsing an SCD file; alternatively, an CCD file can be imported to obtain the equipment parameter information and process layer configuration information of the relay protection device under test; and a CID file can also be imported to obtain the equipment parameter information and station control layer configuration information of the relay protection device under test. The equipment parameter information is used to identify and lock the relay protection test device; the process layer configuration information and station control layer configuration information are used to diagnose the safety isolation status of the relay protection device; and the device parameter information of the relay protection device is the basis for the safety isolation detection of the relay protection device.

[0029] The equipment parameter information of relay protection devices includes IEDName, the bay it belongs to, the voltage level, and the device type; among which:

[0030] The IEDName identifies the equipment name of the relay protection device. It is a unique identifier for all relay protection devices in the entire station and also serves as the key for communication with the station control layer MMS with the relay protection device.

[0031] The bay designation indicates the bay attribute of the relay protection device. Different bay types have different safety isolation measures before testing, which is a crucial basis for the automatic generation of safety isolation detection strategies by the safety isolation device. Generally, relay protection device types include line bays, bus bays, main transformer bays, circuit breaker bays, and automatic transfer switch bays.

[0032] The voltage level indicates the voltage class to which the relay protection device belongs. The safety isolation measures before testing differ for relay protection devices at different voltage levels, and this is an important basis for the automatic generation of safety isolation detection strategies by the safety isolation device. Generally, the voltage levels of relay protection devices include 10kV, 35kV, 110kV, 220kV, 330kV, 500kV, and 750kV.

[0033] The device category indicates the category attribute of the relay protection device. The process layer information and station control layer information corresponding to relay protection devices of different categories are inconsistent. It is an important credential for the safety isolation detection device to automatically identify and lock the relay protection device.

[0034] In this implementation example, the process layer configuration information includes GOOSE message information sent by the relay protection device, received GOOSE message information, sent SMV message information, and received SMV message information. By parsing the SCD or CCD file, the GOOSE and SMV interaction messages between the relay protection device and its associated IED devices are searched. The GOOSE messages sent by the relay protection device to other IED devices are taken as GOOSE sending messages; the GOOSE messages sent by other IEDs to the relay protection device are taken as GOOSE receiving messages; the SMV messages sent by the relay protection device to other IEDs are taken as SMV sending messages; and the SMV messages sent by other IEDs to the relay protection device are taken as SMV receiving messages. GOOSE and SMV messages are essential information for the locking of the relay protection device and the assessment of its safety isolation status.

[0035] In this implementation example, the station control layer configuration information includes the MMS network communication address and MMS network interaction information of the relay protection device. The MMS communication address is used for station control layer network communication between the safety isolation detection device and the relay protection device, and is also used to identify and lock the relay protection device. The MMS messages of the relay protection device are categorized by information type, including setting values, pressure plates, remote signaling, remote measurement, equipment parameters, device status, alarms, and action events. Different types of MMS information reflect the operating conditions of the relay protection device and are important bases for detecting whether the relay protection device is in a safe isolation state.

[0036] 2. Relay protection device automatically identifies and locks:

[0037] Automatic identification and locking of relay protection devices are achieved through the configuration of the relay protection device's IP address and process layer information. The IP address of the relay protection device is the station control layer IP address, obtained from the SCD or CID file. The station control layer IP address includes the station control layer A network address and the station control layer B network address; the IP address used depends on the network port of the actual connected relay protection device. The process layer information configuration of the relay protection device includes the GOOSE messages and SMV protection sent by the relay protection device, obtained from the SCD or CCD file.

[0038] 3. Based on the equipment parameter information of the relay protection device, obtain the secondary safety isolation measures:

[0039] The equipment parameter information includes the interval attributes and voltage level information of the relay protection device. According to the substation relay protection specification, the secondary safety measures isolation sequence is obtained. The secondary safety measures isolation sequence provides corresponding requirements for the status of the GOOSE message, SMV message, and MMS message of the relay protection device.

[0040] Taking 220kV line protection as an example, the bay attribute of this device is line bay, the voltage level is 220kV, and its corresponding safety isolation measures include the protection device maintenance status, telemetry information status, trip output pressure plate status, and three-phase circuit breaker position status, etc. Among them, the device maintenance status can be obtained from the corresponding MMS message; the telemetry information can be obtained from the corresponding SMV message and MMS message; the trip output pressure plate status can be obtained from the corresponding MMS message; and the three-phase circuit breaker position status can be obtained from the corresponding GOOSE message and MMS message.

[0041] 4. Based on the aforementioned secondary safety measures and isolation procedures, generate process-level information sequences and station control-level information sequences:

[0042] The process layer information sequence includes the GOOSE message information sequence and the SMV message information sequence of the relay protection device; the sequence defines the status of the GOOSE message and the corresponding data information of the GOOSE message; the sequence defines the status of the SMV message and the corresponding data information of the SMV message.

[0043] The station control layer information sequence includes the MMS message information sequence of relay protection devices; the sequence defines different types of MMS message information of relay protection devices, such as remote signaling, telemetry, pressure plate, status information, and alarms.

[0044] 5. Based on the process layer information sequence and the station control layer information sequence, combine AND, OR, and NOT logic queues:

[0045] The IP address information, process layer information sequence, and station control layer information sequence and their status requirements in the above steps are logically organized into a security isolation detection logic queue, which is used to compare and analyze the feedback signals collected from the relay protection device to evaluate the security isolation status in real time.

[0046] In this implementation example, the security isolation detection strategy is a NAND gate queue composed of multiple logical expressions. Based on the status of the relay protection device, relevant logical expressions are generated, including IP address identification logical expressions, device locking logical expressions, maintenance status judgment logical expressions, pressure plate status judgment logical expressions, telemetry information judgment logical expressions, status information judgment logical expressions, alarm status judgment logical expressions, etc. All these logical expressions are ANDed together to form the security isolation detection strategy.

[0047] 6. Connect the relay protection device under test:

[0048] In this implementation example, the safety isolation detection device needs to be connected to the station control layer communication port of the relay protection device. When the safety isolation detection device is connected to the station control layer A port of the relay protection device, it is necessary to set an IP address in the same network segment as the station control layer network A IP address of the relay protection device on the safety isolation detection device side, and then send a network PING packet to the relay protection device. By analyzing the response message of the network PING packet, the safety isolation detection device can correctly detect the correctness of the station control layer network communication with the relay protection device, thereby identifying the connected relay protection device.

[0049] In addition, the safety isolation detection device is connected to the process layer communication port of the relay protection device. The process layer communication messages include GOOSE and SMV messages. By extracting the key relay protection parameters after parsing the configuration file in step 2, the GOOSE and SMV messages sent by the relay protection device can be clearly identified. In this embodiment, the safety isolation detection device collects the GOOSE messages sent by the relay protection device, parses the GOOSE message parameters, and compares the GOOSE message information with the GOOSE message parameters in the relay protection device's configuration file to detect the correctness of the relay protection device's GOOSE messages. Similarly, the safety isolation detection device collects the SMV messages sent by the relay protection device, parses the SMV message parameters, and compares the SMV message information with the SMV message parameters in the relay protection device's configuration file to detect the correctness of the relay protection device's SMV messages.

[0050] For GOOSE messages, the communication parameters include "Destination LAN Address" (Destination Mac-Address), "Modification Event Control Block Identifier" (goID), "Control Block Application Identifier" (APPID), "Configuration Version Number" (ConfRev), "Virtual LAN Identifier" (VLAN-ID), "Virtual LAN Priority" (VLAN-Priority), "Minimum Interval Time" (MinTime), and "Maximum Interval Time" (MaxTime); among them, "Destination Mac-Address", "goID", and "APPID" should be unique across the entire site.

[0051] The communication parameters for SMV messages include "Destination LAN Address" (Destination Mac-Address), "Sampling Control Block Identifier" (smvID), "Control Block Application Identifier" (APPID), "Configuration Version Number" (ConfRev), "Virtual LAN Identifier" (VLAN-ID), and "Virtual LAN Priority" (VLAN-Priority); among them, "Destination Mac-Address", "smvID", and "APPID" should be unique across the entire site.

[0052] In this implementation example, when the "Destination Mac-Address", "goID", and "APPID" of the GOOSE message are all the same, the GOOSE message is consistent; when the "Destination Mac-Address", "smvID", and "APPID" of the SMV message are all the same, the SMV message is consistent.

[0053] 7. Conduct secondary safety isolation testing:

[0054] The safety isolation detection device acquires SMV messages, GOOSE messages, and MMS messages from the relay protection device's process layer and station control layer in real time. It then compares and analyzes the acquired message information with the safety isolation detection strategy to automatically assess the safety isolation status of the relay protection device.

[0055] In this implementation example, all GOOSE, SMV, and MMS messages received by the safety isolation testing device should be in the "TEST" state, i.e., the maintenance state. If any message does not meet the "TEST" state, the safety isolation testing device should assess that the safety isolation requirement is not met, lock the safety isolation testing device, and stop any test excitation output.

[0056] For GOOSE messages, parse the GOOSE message, obtain the GOOSE message channel list value, compare the GOOSE message channel value with the corresponding GOOSE channel value in the security isolation policy, and if they are inconsistent, the security isolation detection device should assess that the security isolation requirements are not met.

[0057] For SMV messages, parse GOOSE messages, obtain the GOOSE message channel list value, compare the GOOSE message channel value with the corresponding GOOSE channel value in the security isolation policy, and if they are inconsistent, the security isolation detection device should assess that the security isolation requirements are not met.

[0058] For MMS messages, the security isolation policy is compared based on the different types of MMS messages read in real time.

[0059] In this implementation example, the security isolation detection strategy in step 2.

[0060] For device identification, the logical expression is "station control layer A network PING == 1", and the evaluation result is obtained through the network identification method in step 3.

[0061] For device locking, the logical expression is "GOOSE1==1&&GOOSE2==1&&SMV1==1". The evaluation result is obtained through the GOOSE and SMV messages received in step 3.

[0062] For telemetry information, the logical expression is "Protection A phase voltage telemetry < 0.1 && Protection B phase voltage telemetry < 0.1 && Protection C phase voltage telemetry < 0.1 && Protection A phase current telemetry < 0.1 && Protection B phase current telemetry < 0.1 && Protection C phase current telemetry < 0.1"; the safety isolation detection device reads the protection telemetry information from the relay protection device, substitutes it into the expression to participate in the calculation, and obtains the evaluation result of the telemetry status.

[0063] For the maintenance status, the logical expression is "protect maintenance status == 1". The safety isolation detection device reads the maintenance status from the relay protection device, substitutes it into the expression to participate in the calculation, and obtains the evaluation result of the maintenance status.

[0064] For the pressure plate status, its logical expression is "remote operation == 1 && trip output == 1". The safety isolation detection device reads the pressure plate status from the relay protection device, substitutes it into the expression to participate in the calculation, and obtains the evaluation result of the pressure plate status.

[0065] For the remote signaling status, its logical expression is "A-phase circuit breaker position == 0 && B-phase circuit breaker position == 0 && C-phase circuit breaker position == 0". The safety isolation detection device takes the remote signaling information status of the relay protection device and substitutes it into the expression to participate in the calculation, and obtains the evaluation result of the remote signaling status.

[0066] For equipment status information, the logical expression is "GOOSE total chain break alarm == 1 && SMV sampling invalid == 1". The safety isolation detection device takes the equipment status information of the relay protection device, inputs it into the expression to participate in the calculation, and obtains the evaluation result of the equipment status information.

[0067] For alarm information, the logical expression is "direct sampling port light intensity exceeds lower limit == 1 && direct trip port light intensity exceeds lower limit == 1". The safety isolation detection device takes the alarm information from the relay protection device, substitutes it into the expression to participate in the calculation, and obtains the evaluation result of the alarm information.

[0068] If all the above logical expressions result in correct values, the security isolation policy is satisfied; otherwise, the security isolation policy is not satisfied.

[0069] The safety isolation detection device and the relay protection device are in a state of continuous connection. During the test, the process layer information and station control layer information of the device are pushed to the safety isolation detection device side in real time. By analyzing SMV messages, GOOSE messages, and MMS messages and comparing them with the safety isolation detection strategy, the safety isolation status of the relay protection device can be detected in real time. When the safety isolation conditions are not met, the relay protection device can be locked to ensure the safe and stable operation of the relay protection device.

[0070] This invention extracts key parameters of relay protection from the relay protection configuration file, and then automatically generates a safety isolation detection strategy based on these parameters. The relay protection safety isolation detection device compares and analyzes the SMV, GOOSE, and MMS messages obtained in real time from the relay protection device with the safety isolation detection strategy, automatically completing the assessment of the isolation status of the relay protection device and ensuring the effectiveness of the isolation measures. This method effectively avoids problems caused by the lack of safety isolation detection during relay protection device testing, ensuring the safe and stable operation of the power grid.

[0071] Example 2

[0072] according to Figure 2 As shown, the safety isolation testing device for relay protection devices proposed in this invention includes the following modules:

[0073] The human-machine interaction module is used to obtain substation configuration file information; it is also used to select relay protection devices and display the detailed parameters of the devices; it is also used to edit and display safety isolation detection strategies; it is also used to display feedback signals obtained from relay protection devices and display the diagnostic results of safety isolation detection strategies, providing intuitive operation feedback.

[0074] In this implementation example, the substation configuration file includes SCD, CCD, and CID files. The SCD file contains configuration information for all IEDs (Intelligent Electronic Devices) within the substation, including device model, parameter settings, process-level interaction information, and station control-level interaction information. It describes in detail the connection relationships and communication methods between IEDs, ensuring that the devices can exchange information correctly. Through the SCD file, the device parameter information of any IED within the substation can be obtained.

[0075] The CCD file describes the process layer configuration information of the IED, including the device model and process layer interaction information; the process layer device parameter information of a certain IED can be obtained through the CCD file.

[0076] The CID file describes the station control layer configuration information of the IED, including the device model and station control layer interaction information; through the CID file, the station control layer device parameter information of a certain IED can be obtained.

[0077] Through the human-machine testing module, testers can import SCD, CCD, and CID files to configure and monitor the parameters of the relay protection device under test; they can also flexibly edit the safety isolation detection strategy according to the test requirements to ensure the transparency of the test strategy.

[0078] The test control module is used to control the safety isolation detection device to send excitation signals through the first signal interface module, the second signal interface module, and the third signal interface; it is also used to receive status data from the logic operation module.

[0079] In this implementation example, the test control module receives GOOSE, SMV, and MMS messages through the first, second, and third signal interface modules for security isolation detection. Specifically, the first signal interface module processes process-layer GOOSE messages, the second signal interface module processes process-layer SMV messages, and the third signal interface module processes station control-layer MMS messages. The test control module obtains status data from the logic processing module and adjusts the test procedure based on the current status to monitor the detection process and results.

[0080] The logic operation module is used to calculate the signal data obtained from the data interaction module and feed back the calculated status data to the test control module; it is also used to feed back the calculated result data to the result evaluation module, providing necessary data support for automatic diagnosis.

[0081] In this implementation example, the logic operation module parses the received GOOSE message to obtain GOOSE message parameter information; it also parses the received SMV message to obtain SMV message parameter information; it also parses the received MMS message to obtain message parameter information; and it is also used to send MMS message commands to the relay protection device.

[0082] The result evaluation module is used to acquire the result data from the data interaction module and the logic operation module, and, in conjunction with the safety isolation detection strategy, to complete the diagnosis of the safety isolation status of the relay protection device; it is also used to feed back the diagnostic results to the human-machine interaction module so that operators can understand the test results in a timely manner.

[0083] The results evaluation module compares the parsed GOOSE packet parameters with the GOOSE packet parameters in the security isolation detection strategy. In this implementation example, it compares whether parameters such as the destination LAN address, move event control block identifier (goID), and control block application identifier (APPID) in the GOOSE packet are consistent.

[0084] The parsed SMV packet parameters are compared with the SMV packet parameters in the security isolation detection strategy. In this implementation example, the parameters such as the destination LAN address (Destination Mac-Address), sampling control block identifier (smvID), and control block application identifier (APPID) in the SMV packet are compared to see if they are consistent.

[0085] Compare the parsed MMS message channel value with the MMS message channel value in the security isolation detection strategy.

[0086] The data interaction module is used to send control commands from the test control module to the first signal interface module, the second signal interface module, and the third signal module; it is also used to receive signals from the first signal interface module, the second signal interface module, and the third signal interface module, and to feed back the result data to the result evaluation module and the test data to the logic operation module.

[0087] In this embodiment, the first signal interface module of the safety isolation detection device is an optical Ethernet interface, used to access the process layer network of the relay protection device and interact with the process layer SMV data of the relay protection device. The second signal interface module of the safety isolation detection device is an optical Ethernet interface, used to access the process layer network of the relay protection device and interact with the process layer GOOSE data of the relay protection device. The third signal interface module of the safety isolation detection device is an electrical Ethernet interface, used to access the station control layer network of the relay protection device and interact with the station control layer MMS data of the relay protection device, real-time reading of the telemetry, remote signaling, and pressure plate status of the relay protection device, and sending the data to the logic operation module, result evaluation module, and human-machine interaction module via the data interaction module.

[0088] It should be noted that the specific embodiments described in this invention are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains can make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A safety isolation testing method before testing a relay protection device, characterized in that, The method includes: Import the substation configuration file, identify the relay protection device to be tested, and extract the relay protection device parameters; The relay protection device automatically identifies and locks; Based on the equipment parameter information of the relay protection device, secondary safety isolation measures are obtained; Based on the aforementioned secondary safety and isolation measures, process-level information sequences and station control-level information sequences are generated; Based on the process layer information sequence and the station control layer information sequence, combine AND, OR, and NOT logic queues; Connect the relay protection device under test; A second safety isolation test will be conducted.

2. The safety isolation testing method for a relay protection device before testing, as described in claim 1, is characterized in that... The method automatically identifies and locks the relay protection device based on its IP address and process layer information configuration.

3. The safety isolation testing method for a relay protection device before testing, as described in claim 1, is characterized in that... The method obtains a sequence of secondary safety isolation measures based on the substation relay protection specifications.

4. A safety isolation testing method for relay protection devices before testing, as described in claim 1 or 3, characterized in that, The method provides corresponding requirements for the status of GOOSE, SMV, and MMS messages of the relay protection device based on the sequence of secondary safety isolation measures.

5. The safety isolation testing method for a relay protection device before testing, as described in claim 4, is characterized in that... The method generates logical expressions based on the status of the GOOSE, SMV, and MMS messages of the relay protection device, combines the logical expressions to generate AND, OR, and NOT logic queues, and forms a safety isolation detection strategy.

6. A safety isolation testing device for relay protection devices before testing, characterized in that, The device performs the method according to any one of claims 1 to 5, the device comprising: a human-machine interaction module for importing or displaying parameters; a data interaction module for providing device parameter information; a logic operation module for generating a security isolation detection strategy; a result evaluation module for evaluating the security isolation status and generating diagnostic results; a test control module for sending excitation signals and receiving feedback signals; and a signal interface module for communicating with the device under test. The logic operation module calculates the signal data obtained from the data interaction module, feeds back the calculated state data to the test control module, and feeds back the calculated result data to the result evaluation module.

7. A safety isolation testing device for relay protection devices before testing, as described in claim 6, is characterized in that, The data interaction module sends control commands from the test control module to the signal interface module; receives signals from the signal interface module and feeds back the result data to the result evaluation module, and feeds back the test data to the logic operation module.

8. A safety isolation testing device for relay protection devices before testing, as described in claim 6 or 7, characterized in that, The signal interface module includes a first signal interface module, a second signal interface module, and a third signal interface module; wherein, the first signal interface module is an optical Ethernet interface, connected to the process layer network of the relay protection device, and interacts with the process layer SMV data of the relay protection device; wherein, the second signal interface module is an optical Ethernet interface, connected to the process layer network of the relay protection device, and interacts with the process layer GOOSE data of the relay protection device; wherein, the third signal interface module is an electrical Ethernet interface, connected to the station control layer network of the relay protection device, and interacts with the station control layer MMS data of the relay protection device.

9. A safety isolation testing device for relay protection devices before testing, as described in claim 6, characterized in that, The result evaluation module, in conjunction with the safety isolation detection strategy, completes the diagnosis of the safety isolation status of the relay protection device and feeds back the diagnosis results to the human-machine interaction module.

10. A safety isolation testing device for relay protection devices before testing, as described in claim 6 or 9, characterized in that, The human-computer interaction module displays the diagnostic results.

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