Monitoring system and method for power distribution automation terminal

Abstract

The invention discloses a monitoring system and method for a power distribution automation terminal. The system comprises an encryption module, a terminal offline monitoring module, a power distribution automation terminal, a data storage module and a controller module, the encryption module communicates with the power distribution automation terminal through a target communication link, and the terminal offline monitoring module is connected to the target communication link in series; the encryption module and the terminal off-line monitoring module send a self-checking message to each other, and the controller module judges the sent self-checking message based on a preset message interaction logic to determine the fault of the distribution automation terminal. According to the technical scheme, the terminal off-line monitoring module is connected in series to the communication link between the original power distribution automation terminal and the encryption module, so that the fault of the power distribution automation terminal is monitored in time based on the message interaction logic, and the operation and maintenance efficiency and accuracy of the power distribution automation terminal are improved.

Description

Technical Field

[0001] The present application relates to the field of distribution automation operation and maintenance, and in particular to a monitoring system and method for distribution automation terminals. Background Art

[0002] The distribution automation terminal is a key component for the communication between the automatic switch and the distribution network master station. However, due to the communication logic between the distribution automation terminal and the distribution network master station, the distribution network master station cannot conduct real-time online monitoring of the distribution network automation terminal and the encryption module. In addition, the encryption module is also affected by factors such as outdoor operating conditions, the strength of the wireless public network signal of the communication service provider, or the loosening of the communication cable, causing it to go offline during the detection cycle of the distribution network master station and unable to remain stable. The above situation will also cause abnormal communication of the distribution automation terminal, thereby affecting the "four remote" functions of the automatic switch, and have an adverse impact on the reliability and practicality of the distribution network automation switch.

[0003] At present, the distribution network master station usually sends a heartbeat packet to the encryption module to verify whether the encryption module is offline, but it is impossible to identify whether the link between the encryption module and the distribution automation terminal is disconnected and whether the message interaction is normal. At the same time, it is also impossible to analyze the link failure and inform the operation and maintenance personnel in time. Therefore, how to monitor the communication problem between the distribution automation terminal and the distribution network master station is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The present application provides a monitoring system and method for a distribution automation terminal, which improves the operation and maintenance efficiency and accuracy of the distribution automation terminal by serially connecting a terminal offline monitoring module to the communication link between the original distribution automation terminal and the encryption module, so as to realize timely monitoring of distribution automation terminal faults based on message interaction logic.

[0005] According to one aspect of the present application, a monitoring system for a distribution automation terminal is provided, the system comprising an encryption module, a terminal offline monitoring module, a distribution automation terminal, a data storage module and a controller module, wherein the encryption module communicates with the distribution automation terminal via a target communication link, and the terminal offline monitoring module is connected in series to the target communication link; wherein,

[0006] The encryption module is used to send a first self-test message to the terminal offline monitoring module based on the target communication link, and store the first self-test message in the first port of the data storage module;

[0007] The terminal offline monitoring module is used to send a second self-test message to the encryption module based on the target communication link, receive a first self-test message sent by the encryption module, and store the second self-test message to the second port of the data storage module; wherein the first self-test message corresponds to the second self-test message content;

[0008] The encryption module is further used to receive a second self-test message sent by the terminal offline monitoring module;

[0009] The controller module is used to judge the first self-test message and the second self-test message stored in the data storage module based on a preset message interaction logic to determine the fault of the distribution automation terminal.

[0010] According to another aspect of the present application, a method for monitoring a distribution automation terminal is provided, which is applied to a monitoring system of the distribution automation terminal, and the method comprises:

[0011] Sending a first self-test message to the terminal offline monitoring module based on the target communication link through the encryption module, and storing the first self-test message in the first port of the data storage module;

[0012] Sending a second self-test message to the encryption module based on the target communication link through the terminal offline monitoring module, receiving a first self-test message sent by the encryption module, and storing the second self-test message in the second port of the data storage module; wherein the first self-test message corresponds to the second self-test message content;

[0013] Receiving, through the encryption module, a second self-test message sent by the terminal offline monitoring module;

[0014] The controller module judges the first self-test message and the second self-test message stored in the data storage module based on a preset message interaction logic to determine the fault of the distribution automation terminal.

[0015] The technical solution provided in the present application, by serially connecting a terminal offline monitoring module to the communication link between the original distribution automation terminal and the encryption module, realizes timely monitoring of distribution automation terminal faults based on message interaction logic, thereby improving the operation and maintenance efficiency and accuracy of the distribution automation terminal.

[0016] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the structure of a monitoring system for a distribution automation terminal provided in an embodiment of the present application.

[0019] Figure 2 A schematic diagram of the structure of a signal conversion module provided in an embodiment of the present application.

[0020] Figure 3 A control flow chart of the first control unit provided in an embodiment of the present application.

[0021] Figure 4 A control flow chart of the second control unit provided in an embodiment of the present application.

[0022] Figure 5 A flow chart of a method for monitoring a distribution automation terminal provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "target", "first", "second", "third", "fourth", "preset", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] Embodiment 1

[0026] Figure 1 This is a schematic diagram of the structure of a monitoring system for a distribution automation terminal provided in an embodiment of the present application. This embodiment can be applied to the case where the communication status of the distribution automation terminal is monitored. Figure 1 As shown, the monitoring system of the distribution automation terminal provided in the embodiment of the present invention includes an encryption module, a terminal offline monitoring module, a distribution automation terminal, a data storage module and a controller module, wherein the encryption module communicates with the distribution automation terminal via a target communication link, and the terminal offline monitoring module is connected in series to the target communication link; wherein,

[0027] The encryption module is used to send a first self-test message to the terminal offline monitoring module based on the target communication link, and store the first self-test message in the first port of the data storage module;

[0028] The terminal offline monitoring module is used to send a second self-test message to the encryption module based on the target communication link, receive a first self-test message sent by the encryption module, and store the second self-test message to the second port of the data storage module; wherein the first self-test message corresponds to the second self-test message content;

[0029] The encryption module is further used to receive a second self-test message sent by the terminal offline monitoring module;

[0030] The controller module is used to judge the first self-test message and the second self-test message stored in the data storage module based on a preset message interaction logic to determine the fault of the distribution automation terminal.

[0031] It should be noted that after the monitoring system of the distribution automation terminal is started, the configuration parameters will be read and the system self-check will be performed to determine the communication relationship between the distribution automation terminal and the distribution network master station.

[0032] The encryption module 110 is connected to the distribution network master station and is used to encrypt the message of the distribution network master station and forward it to the distribution automation terminal. The terminal offline monitoring module 140 is connected to the distribution automation terminal 150 and is used to monitor and analyze the message of the distribution automation terminal 150.

[0033] For ease of description, the present invention describes the communication between the distribution network master station and the distribution automation terminal 150 as the communication between the encryption module 110 and the terminal offline monitoring module 140 .

[0034] Specifically, the encryption module 110 and the terminal offline monitoring module 140 communicate with each other through a target communication link, which may be a 232 link.

[0035] Optionally, the system further includes a signal conversion module; the signal conversion module is used to convert the communication signal passing through the target communication link.

[0036] like Figure 2 FIG. 1 is a schematic diagram of a signal conversion module provided in an embodiment of the present application. The signal conversion module includes a signal relay and a 232 to TTL module.

[0037] Among them, the signal relay is used to check whether the device circuit is normal; the 232 to TTL module is used to convert 232 signals and TTL signals; the MCU module is a controller module, which is used for data processing, signal acquisition and module control.

[0038] Based on Figure 2 The signal conversion module shown in the figure takes the example of the terminal offline monitoring module sending data to the encryption module to explain the principle of the signal conversion module. First, the data is sent from the terminal offline monitoring module to the normally closed terminal nc on the signal relay corresponding to the terminal offline monitoring module; then it is sent from the common terminal com on the signal relay corresponding to the terminal offline monitoring module to the 232 to TTL module to convert the data format; then the converted data is sent to the MCU module; then the data is sent to the 232 to TTL module on the other side for data format conversion; then the converted data is sent to the common terminal com on the signal relay corresponding to the encryption module; then it is sent from the normally closed terminal nc on the signal relay corresponding to the encryption module to the encryption module.

[0039] Furthermore, based on the self-test circuit, data is sent to both ends respectively to test whether the other end has correctly received the sent message. If it cannot be received, an alarm will be issued to notify the operation and maintenance personnel that the device has a fault. If both can be received normally, the control signal relay will be reset to restore the circuits at both ends to a normal state.

[0040] The beneficial effect of the above technical solution is that by switching the 232-to-TTL module circuit through the signal relay, a loop is generated to achieve self-checking of the monitoring system of the distribution automation terminal.

[0041] In order to avoid conflicts caused by the encryption module 110 and the terminal offline monitoring module 140 sending or receiving messages at the same time, the present application also provides a data buffer to temporarily store message data, determine the receiving order of the message data, and then control the sending order of the messages at both ends.

[0042] Optionally, the encryption module is used to send a first self-test message to a first buffer based on the target communication link; the terminal offline monitoring module is used to send a second self-test message to a second buffer based on the target communication link; the controller module is used to send the data stored in the first buffer to the terminal offline monitoring module and stored in the first port of the data storage module if data is first detected in the first buffer, and suspend the message forwarding operation of the terminal offline monitoring module until the message forwarding operation of the encryption module is completed; or, if data is first detected in the second buffer, send the data stored in the first buffer to the encryption module and stored in the second port of the data storage module, and suspend the message forwarding operation of the encryption module until the message forwarding operation of the terminal offline monitoring module is completed.

[0043] Specifically, when a message from a certain end is received in the buffer, the message forwarding operation of the end will be stopped until the message is forwarded to the other end and then resumed, so as to avoid the conflict of messages at the two ends.

[0044] The controller module 120 may be a microprocessor MPU, a microcontroller MCU or a digital signal processor DSP, etc., which is not limited in the embodiment of the present application.

[0045] The controller module 120 can judge the first self-test message and the second self-test message stored in the data storage module based on the preset message interaction logic to determine the fault of the distribution automation terminal. The preset message interaction logic can be the rules and processes for sending, receiving and processing messages preset by the system. For example, the frame header, data segment, check code, frame tail, etc. of the message can be limited.

[0046] Specifically, the frame header, data segment, check code and frame tail of the first self-test message and the second self-test message may be verified to determine whether the message is correctly sent or received.

[0047] In addition, optionally, the controller module is also used to detect the data stored in the data storage module; if the first self-test message is not detected within the first preset time, it is determined that the encryption module has timed out and is disconnected; if the second self-test message is not detected within the second preset time, it is determined that the terminal offline monitoring module has timed out and is disconnected.

[0048] After the monitoring system of the distribution automation terminal starts self-checking, the timer will be started to determine whether the encryption module or the terminal offline monitoring module receives or forwards the message within the configured message vacuum time. If the message is not received or forwarded, it will be judged as a timeout and the link will be disconnected. The communication abnormality indicator light will be turned on and a fault message will be sent to the operation and maintenance personnel.

[0049] The data storage module 130 is used to receive and store data and provide data reading service when needed. Optionally, the data storage module 130 may be an EMMC module.

[0050] In the present application, the data storage module 130 may be used to store the first self-test message and the second self-test message, and provide the controller module 120 with a function of reading the stored first self-test message and the second self-test message.

[0051] The embodiment of the present application connects a terminal offline monitoring module in series on the communication link between the original distribution automation terminal and the encryption module to achieve timely monitoring of distribution automation terminal faults based on message interaction logic, thereby improving the operation and maintenance efficiency and accuracy of the distribution automation terminal.

[0052] On the basis of the above embodiment, optionally, the controller module includes: a first control unit, used to determine whether the data of the first port is the first self-test message based on a preset message interaction logic; if so, determine whether the data of the second port is the second self-test message; if not, determine that the fault of the distribution automation terminal is no response; a second control unit, used to determine whether the message of the second port is the second self-test message based on a preset message interaction logic; if so, determine whether the data of the first port is the first self-test message; if not, determine that the fault of the distribution automation terminal is a communication abnormality.

[0053] Specifically, the data port of the data storage module can be judged first. If the data port is the first port, it can be determined whether the data of the first port is the first self-test message; if it is not the first self-test message, it is determined that the fault of the distribution automation terminal is no response; if it is the first self-test message, it is determined whether the data of the second port is the second self-test message; if it is the second self-test message, it is determined that the distribution automation terminal has no fault; if it is not the second self-test message, it is determined that the fault of the distribution automation terminal is no response.

[0054] If the data port is the second port, it can be determined first whether the data of the second port is the second self-test message; if it is not the second self-test message, it is determined that the fault of the distribution automation terminal is a communication abnormality; if it is the second self-test message, it is determined whether the data of the first port is the first self-test message; if it is the first self-test message, it is determined that the distribution automation terminal has no fault; if it is not the first self-test message, it is determined that the fault of the distribution automation terminal is a communication abnormality.

[0055] Optionally, the first self-test message includes a first frame header message and a second frame header message; wherein, the first frame header message is a message requesting data test sent by the distribution network master station to the terminal offline monitoring module through the encryption module, and the second frame header message is a message requesting link status sent by the distribution network master station to the terminal offline monitoring module through the encryption module; the second self-test message includes a third frame header message and a fourth frame header message; wherein, the third frame header message is a message carrying the status information of the terminal offline monitoring module sent by the terminal offline monitoring module to the distribution network master station, and the fourth frame header message is a message confirming the link status information sent by the terminal offline monitoring module to the distribution network master station.

[0056] Among them, the first frame header message corresponds to the third frame header message, and the second frame header message corresponds to the fourth frame header message.

[0057] The advantage of the above technical solution is that the accuracy of identifying distribution automation terminal faults is improved by detecting both data call detection and link status message data.

[0058] Based on the above embodiment, the first control unit is specifically used for:

[0059] A1. Determine whether the data of the first port is the first frame header message based on a preset message interaction logic;

[0060] A2: If yes, go to step A3; if no, go to step A5;

[0061] A3, determining whether the data of the second port is the third frame header message;

[0062] A4. If yes, determine that the distribution automation terminal has no fault; if no, jump to step A5;

[0063] A5. Determine whether the data of the first port is the second frame header message;

[0064] A6. If yes, jump to step A7; if no, determine that the fault of the distribution automation terminal is no response;

[0065] A7. Determine whether the data of the second port is the fourth frame header message;

[0066] A8. If yes, it is determined that the distribution automation terminal has no fault; if no, it is determined that the fault of the distribution automation terminal is no response.

[0067] In order to more accurately analyze the messages of each port in the data storage module, the embodiment of the present application may also set a timer and a counter. Figure 3A control flow chart of the first control unit provided in the embodiment of the present application, such as Figure 3 shown.

[0068] Assume that the first frame header message is a 107a frame header message, the second frame header message is a 1049 frame header message, the third frame header message is a 68 frame header message, and the fourth frame header message is a 100b frame header message.

[0069] After determining that the data of the first port does not contain the 10 7a frame header message and the 10 49 frame header message, it can be determined whether there is a 10 frame header message in the first port to determine whether it is caused by an error in the message frame header sent by the encryption module.

[0070] It should be noted that the first frame header message may be detected first, and then the second frame header message may be detected, and this embodiment of the present application does not limit this.

[0071] Based on the above embodiment, the second control unit is specifically used for:

[0072] B1. Determine whether the data of the second port is the fourth frame header message based on a preset message interaction logic;

[0073] B2, if yes, jump to step B3; if no, jump to step B5;

[0074] B3, determining whether the data of the first port is the second frame header message;

[0075] B4. If yes, it is determined that the distribution automation terminal has no fault; if no, it is determined that the fault of the distribution automation terminal is a communication abnormality;

[0076] B5. Determine whether the data of the second port is the third frame header message;

[0077] B6. If yes, jump to step B7; if no, determine that the fault of the distribution automation terminal is no response;

[0078] B7. Determine whether the data of the first port is the first frame header message;

[0079] B8. If yes, it is determined that the distribution automation terminal has no fault; if no, it is determined that the fault of the distribution automation terminal is a communication abnormality.

[0080] In order to more accurately analyze the messages of each port in the data storage module, the embodiment of the present application may also set a timer and a counter. Figure 4 A control flow chart of the second control unit provided in the embodiment of the present application, such as Figure 4 shown.

[0081] Assume that the first frame header message is a 107a frame header message, the second frame header message is a 1049 frame header message, the third frame header message is a 68 frame header message, and the fourth frame header message is a 100b frame header message.

[0082] It should be noted that the third frame header message may be detected first, and then the fourth frame header message may be detected, and this embodiment of the present application does not limit this.

[0083] Figure 5 The present invention provides a flow chart of a method for monitoring a distribution automation terminal. Figure 5 As shown, the method of this embodiment specifically includes the following steps.

[0084] S510. Send a first self-test message to the terminal offline monitoring module based on the target communication link through the encryption module, and store the first self-test message in the first port of the data storage module.

[0085] S520, sending a second self-test message to the encryption module based on the target communication link through the terminal offline monitoring module, receiving a first self-test message sent by the encryption module, and storing the second self-test message to the second port of the data storage module.

[0086] S530: Receive, through the encryption module, a second self-test message sent by the terminal offline monitoring module.

[0087] S540. Using the controller module, based on a preset message interaction logic, judge the first self-test message and the second self-test message stored in the data storage module to determine the fault of the distribution automation terminal.

[0088] Optionally, judging the first self-test message and the second self-test message stored in the data storage module based on a preset message interaction logic by the controller module to determine the fault of the distribution automation terminal includes:

[0089] Based on the preset message interaction logic, determine whether the data of the first port is the first self-test message; if so, determine whether the data of the second port is the second self-test message; if not, determine that the fault of the distribution automation terminal is no response;

[0090] Based on the preset message interaction logic, determine whether the message of the second port is the second self-test message; if so, determine whether the data of the first port is the first self-test message; if not, determine that the fault of the distribution automation terminal is a communication abnormality.

[0091] An embodiment of the present invention provides a monitoring method for a distribution automation terminal. The method connects a terminal offline monitoring module in series on the communication link between the original distribution automation terminal and the encryption module to realize timely monitoring of distribution automation terminal faults based on message interaction logic, thereby improving the operation and maintenance efficiency and accuracy of the distribution automation terminal.

[0092] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0093] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A monitoring system for distribution automation terminals, characterized in that: The system includes an encryption module, a terminal offline monitoring module, a distribution automation terminal, a data storage module and a controller module. The encryption module communicates with the distribution automation terminal via a target communication link, and the terminal offline monitoring module is connected in series to the target communication link; wherein, The encryption module is used to send a first self-test message to the terminal offline monitoring module based on the target communication link, and store the first self-test message in the first port of the data storage module; The terminal offline monitoring module is used to send a second self-test message to the encryption module based on the target communication link, receive a first self-test message sent by the encryption module, and store the second self-test message to the second port of the data storage module; wherein the first self-test message corresponds to the second self-test message content; The encryption module is further used to receive a second self-test message sent by the terminal offline monitoring module; The controller module is used to judge the first self-test message and the second self-test message stored in the data storage module based on a preset message interaction logic to determine the fault of the distribution automation terminal.

2. The system according to claim 1, characterized in that The encryption module is used to send the first self-test message to the first buffer based on the target communication link; The terminal offline monitoring module is used to send the second self-test message to the second buffer based on the target communication link; The controller module is configured to, if data is detected to exist in the first buffer first, send the data stored in the first buffer to the terminal offline monitoring module and store it in the first port of the data storage module, and suspend the message forwarding operation of the terminal offline monitoring module until the message forwarding operation of the encryption module is completed; Alternatively, if data is detected in the second buffer first, the data stored in the first buffer is sent to the encryption module and stored in the second port of the data storage module, and the message forwarding operation of the encryption module is suspended until the message forwarding operation of the terminal offline monitoring module is completed.

3. The system according to claim 1, characterized in that The controller module comprises: A first control unit, configured to determine, based on a preset message interaction logic, whether the data of the first port is the first self-test message; if so, determine whether the data of the second port is the second self-test message; if not, determine that the fault of the distribution automation terminal is no response; The second control unit is used to determine whether the message of the second port is the second self-test message based on the preset message interaction logic; if so, determine whether the data of the first port is the first self-test message; if not, determine that the fault of the distribution automation terminal is a communication abnormality.

4. The system according to claim 3, characterized in that The first self-test message includes a first frame header message and a second frame header message; wherein the first frame header message is a message for requesting data test sent by the distribution network master station to the terminal offline monitoring module through the encryption module, and the second frame header message is a message for requesting link status sent by the distribution network master station to the terminal offline monitoring module through the encryption module; The second self-test message includes a third frame header message and a fourth frame header message; wherein the third frame header message is a message sent by the terminal offline monitoring module to the distribution network master station carrying the status information of the terminal offline monitoring module, and the fourth frame header message is a message sent by the terminal offline monitoring module to the distribution network master station to confirm the link status information.

5. The system according to claim 4, characterized in that The first control unit is specifically used for: A1. Determine whether the data of the first port is the first frame header message based on a preset message interaction logic; A2: If yes, go to step A3; if no, go to step A5; A3, determining whether the data of the second port is the third frame header message; A4. If yes, it is determined that the distribution automation terminal has no faults; If not, jump to step A5; A5. Determine whether the data of the first port is the second frame header message; A6: If yes, go to step A7; If not, determining that the fault of the distribution automation terminal is no response; A7. Determine whether the data of the second port is the fourth frame header message; A8. If yes, it is determined that the distribution automation terminal has no fault; if no, it is determined that the fault of the distribution automation terminal is no response.

6. The system according to claim 4, characterized in that The second control unit is specifically used for: B1. Determine whether the data of the second port is the fourth frame header message based on a preset message interaction logic; B2, if yes, jump to step B3; If not, jump to step B5; B3, determining whether the data of the first port is the second frame header message; B4. If yes, it is determined that the distribution automation terminal has no faults; If not, it is determined that the fault of the distribution automation terminal is a communication abnormality; B5. Determine whether the data of the second port is the third frame header message; B6. If yes, jump to step B7; if no, determine that the fault of the distribution automation terminal is no response; B7. Determine whether the data of the first port is the first frame header message; B8. If yes, it is determined that the distribution automation terminal has no fault; if no, it is determined that the fault of the distribution automation terminal is a communication abnormality.

7. The system according to claim 1, characterized in that The system also includes a signal conversion module; The signal conversion module is used to convert the communication signal passing through the target communication link.

8. The system according to claim 1, characterized in that The controller module is further used to detect the data stored in the data storage module; If the first self-test message is not detected within the first preset time, it is determined that the encryption module has timed out and is disconnected; If the second self-test message is not detected within the second preset time, it is determined that the terminal offline monitoring module has timed out and is disconnected.

9. A method for monitoring a distribution automation terminal, characterized in that: A monitoring system applied to the distribution automation terminal, the system comprising an encryption module, a terminal offline monitoring module, a distribution automation terminal, a data storage module and a controller module, the encryption module and the distribution automation terminal communicate via a target communication link, the terminal offline monitoring module is connected in series to the target communication link; wherein the method comprises: Sending a first self-test message to the terminal offline monitoring module based on the target communication link through the encryption module, and storing the first self-test message in the first port of the data storage module; Sending a second self-test message to the encryption module based on the target communication link through the terminal offline monitoring module, receiving a first self-test message sent by the encryption module, and storing the second self-test message in the second port of the data storage module; wherein the first self-test message corresponds to the second self-test message content; Receiving, through the encryption module, a second self-test message sent by the terminal offline monitoring module; The controller module judges the first self-test message and the second self-test message stored in the data storage module based on a preset message interaction logic to determine the fault of the distribution automation terminal.

10. The method according to claim 9, characterized in that The controller module determines the first self-test message and the second self-test message stored in the data storage module based on a preset message interaction logic to determine the fault of the distribution automation terminal, including: Based on the preset message interaction logic, determine whether the data of the first port is the first self-test message; if so, determine whether the data of the second port is the second self-test message; if not, determine that the fault of the distribution automation terminal is no response; Based on the preset message interaction logic, determine whether the message of the second port is the second self-test message; if so, determine whether the data of the first port is the first self-test message; if not, determine that the fault of the distribution automation terminal is a communication abnormality.

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