A monitoring system and method for a power distribution automation terminal

Abstract

The application discloses a kind of power distribution automation terminal monitoring system and method.Therein, the system includes encryption module, terminal offline monitoring module, power distribution automation terminal, data storage module and controller module, encryption module and power distribution automation terminal are communicated by target communication link, and terminal offline monitoring module is connected in series on target communication link;Encryption module and terminal offline monitoring module send and receive self-checking message, and judge the self-checking message sent based on preset message interaction logic by controller module, to determine the fault of power distribution automation terminal.The technical scheme, by connecting in series into terminal offline monitoring module between original power distribution automation terminal and encryption module communication link, to realize the timely monitoring of power distribution automation terminal fault based on message interaction logic, improve the operation and maintenance efficiency and accuracy of power distribution automation terminal.

Description

TECHNICAL FIELD

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

[0002] The power distribution automation terminal is a key component for communication between an automatic switch and a power distribution network master station. However, the power distribution network master station cannot perform real-time online monitoring on the power distribution automation terminal and the encryption module in real time due to the communication logic between the power distribution automation terminal and the power distribution network master station. Moreover, the encryption module is also affected by factors such as outdoor operating conditions, wireless public network signal strength of a communication service provider, or communication cable loosening, which causes it to be offline during the detection period of the power distribution network master station and unable to maintain stability. The above situations also cause communication abnormalities of the power distribution automation terminal, thereby affecting the "four remote" functions of the automatic switch and adversely affecting the reliability and practicability of the power distribution network automation switch.

[0003] Currently, the power distribution network master station usually sends a heartbeat packet to the encryption module to verify whether the encryption module is offline. However, the power distribution network master station cannot identify whether the link between the encryption module and the power distribution automation terminal is disconnected and whether the message interaction is normal, and also cannot analyze the link failure situation to inform the operation and maintenance personnel in time. Therefore, how to monitor the communication problems between the power distribution automation terminal and the power distribution network master station is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0004] The present application provides a monitoring system and method for a power distribution automation terminal. By connecting a terminal offline monitoring module in series on the communication link between the original power distribution automation terminal and the encryption module, the timely monitoring of the power distribution automation terminal failure is realized based on the message interaction logic, thereby improving the operation and maintenance efficiency and accuracy of the power distribution automation terminal.

[0005] According to an aspect of the present application, a monitoring system for a power distribution automation terminal is provided. The system includes 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 in series on the target communication link. Wherein,

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

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

[0008] The encryption module is further configured to receive the second self-check message sent by the terminal offline monitoring module.

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

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

[0011] The encryption module is configured to send a first self-check message to the terminal offline monitoring module based on the target communication link, and store the first self-check message in a first port of the data storage module.

[0012] The terminal offline monitoring module is configured to send a second self-check message to the encryption module based on the target communication link, receive the first self-check message sent by the encryption module, and store the second self-check message in a second port of the data storage module; wherein the first self-check message corresponds to the content of the second self-check message.

[0013] The encryption module is configured to receive the second self-check message sent by the terminal offline monitoring module.

[0014] The controller module is configured to judge the first self-check message and the second self-check message stored in the data storage module based on a preset message interaction logic, and determine the fault of the power distribution automation terminal.

[0015] The technical scheme provided by the present application realizes the timely monitoring of the fault of the power distribution automation terminal based on the message interaction logic by connecting the terminal offline monitoring module in series on the communication link between the original power distribution automation terminal and the encryption module, and improves the operation and maintenance efficiency and accuracy of the power distribution automation terminal.

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

[0017] In order to make the technical solutions in the embodiments of the present application clearer, the accompanying drawings needed in the embodiment description will be briefly introduced. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the accompanying drawings.

[0018] Figure 1 A structural schematic diagram of a monitoring system of a power distribution automation terminal provided by the embodiment of the present application.

[0019] Figure 2 A structural schematic diagram of a signal conversion module provided by the embodiment of the present application.

[0020] Figure 3 A control flowchart of a first control unit provided by the embodiment of the present application.

[0021] Figure 4 A control flowchart of a second control unit provided by the embodiment of the present application.

[0022] Figure 5 A flowchart of a monitoring method of a power distribution automation terminal provided by the embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the technical solutions in the embodiments of the present application clearer, the accompanying drawings needed in the embodiment description will be briefly introduced. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the accompanying drawings.

[0024] It should be noted that the terms "target", "first", "second", "third", "fourth", "preset" and the like in the description, claims and accompanying drawings of the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0025] Embodiment one

[0026] Figure 1 A structural diagram of a power distribution automation terminal monitoring system provided by an embodiment of the present application, which can be applied to the case of monitoring the communication state of a power distribution automation terminal. Figure 1 As shown in the figure, the power distribution automation terminal monitoring system provided by the embodiment of the present application includes 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 in series on the target communication link. Wherein,

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

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

[0029] The encryption module is further configured to receive the second self-check message sent by the terminal offline monitoring module.

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

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

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

[0033] For the convenience of description, the communication between the power grid master station and the power distribution automation terminal 150 is described 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 both communicate through a target communication link. The target communication link can be a 232 link.

[0035] Optionally, the system further comprises a signal conversion module; the signal conversion module is configured to convert the communication signal transmitted through the target communication link.

[0036] As shown in Figure 2 , a structural schematic diagram of a signal conversion module provided by an embodiment of the present application. The signal conversion module comprises a signal relay and a 232-to-TTL module.

[0037] The signal relay is configured to check whether the device loop is normal; the 232-to-TTL module is configured to convert the 232 signal and the TTL signal; and the MCU module is a controller module, configured to perform data processing, signal acquisition and module control.

[0038] Based on the signal conversion module as shown in Figure 2 , the principle of the signal conversion module is explained by taking the terminal offline monitoring module sending data to the encryption module as an example. First, the data is sent by the terminal offline monitoring module to the normally closed end nc corresponding to the terminal offline monitoring module on the signal relay; then the data is sent by the common end com corresponding to the terminal offline monitoring module on the signal relay to the 232-to-TTL module for conversion of 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 end com corresponding to the encryption module on the signal relay; and then the data is sent by the normally closed end nc corresponding to the encryption module on the signal relay to the encryption module.

[0039] Further, after the self-checking loop sends data to both ends respectively, it is tested whether the opposite end correctly receives the sent message. If the message cannot be received, an alarm is given to notify the operation and maintenance personnel that the device is malfunctioning. If both ends can normally receive the message, the signal relay is reset to restore the loop to the normal state.

[0040] The above technical solution has the beneficial effect that the 232-to-TTL module loop is switched by the signal relay to generate a loop, thereby achieving self-checking of the monitoring system of the power distribution automation terminal.

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

[0042] Optionally, the encryption module is configured to send a first self-check message to a first buffer based on the target communication link; the terminal offline monitoring module is configured to send a second self-check message to a second buffer based on the target communication link; and the controller module is configured to send the data stored in the first buffer to the terminal offline monitoring module and store the data in a first port of the data storage module if the first buffer is detected to have data first, and pause the message forwarding operation of the terminal offline monitoring module until the message forwarding operation of the encryption module is completed; or send the data stored in the first buffer to the encryption module and store the data in a second port of the data storage module if the second buffer is detected to have data first, and pause 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 of one end is received in the buffer, the message forwarding operation of the one end is stopped until the message is forwarded to the other end, and then the message forwarding operation is resumed, so as to avoid the conflict of messages of the two ends.

[0044] The controller module 120 can be a microprocessor MPU, a microcontroller MCU, or a digital signal processor DSP, and the embodiments of the present application do not limit this.

[0045] The controller module 120 can determine the fault of the power distribution automation terminal by judging the first self-check message and the second self-check message stored in the data storage module based on a preset message interaction logic. The preset message interaction logic can be a rule and a process of message sending, receiving, and processing preset by the system. For example, the frame header, the data segment, the check code, and the frame tail of the message can be limited.

[0046] Specifically, whether the message is correctly sent or received can be determined by verifying the frame header, the data segment, the check code, and the frame tail of the first self-check message and the second self-check message.

[0047] In addition, the controller module can further be configured to detect the data stored in the data storage module; if the first self-check message is not detected within a first preset time, it is determined that the encryption module is in a timeout disconnection state; and if the second self-check message is not detected within a second preset time, it is determined that the terminal offline monitoring module is in a timeout disconnection state.

[0048] After the monitoring system of the power distribution automation terminal starts self-checking, a timer is started to determine whether the encryption module or the terminal offline monitoring module receives or forwards a message within a configured message vacuum time. If no message is received or forwarded, it is determined that the timeout disconnection state occurs, the communication abnormality indicator light is lit, and the fault information is sent to the operation and maintenance personnel.

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

[0050] In the present application, the data storage module 130 is configured to store the first self-check message and the second self-check message and provide reading function of the stored first self-check message and the second self-check message for the controller module 120.

[0051] In the present application, the terminal offline monitoring module is connected in series on the communication link between the original power distribution automation terminal and the encryption module to realize timely monitoring of the power distribution automation terminal failure based on message interaction logic, thereby improving the operation and maintenance efficiency and accuracy of the power distribution automation terminal.

[0052] In the above embodiment, the controller module can further include a first control unit configured to determine whether the data of the first port is the first self-check message based on the preset message interaction logic, and if yes, determine whether the data of the second port is the second self-check message, and if no, determine that the failure of the power distribution automation terminal is non-response; and a second control unit configured to determine whether the message of the second port is the second self-check message based on the preset message interaction logic, and if yes, determine whether the data of the first port is the first self-check message, and if no, determine that the failure of the power distribution automation terminal is communication abnormality.

[0053] Specifically, the data port of the data storage module can be determined first. If the data port is the first port, it can be determined first whether the data of the first port is the first self-check message. If no, it is determined that the failure of the power distribution automation terminal is non-response. If yes, it is determined whether the data of the second port is the second self-check message. If yes, it is determined that the power distribution automation terminal is fault-free. If no, it is determined that the failure of the power distribution automation terminal is non-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-check message. If no, it is determined that the failure of the power distribution automation terminal is communication abnormality. If yes, it is determined whether the data of the first port is the first self-check message. If yes, it is determined that the power distribution automation terminal is fault-free. If no, it is determined that the failure of the power distribution automation terminal is communication abnormality.

[0055] Optionally, the first self-check message comprises a first frame header message and a second frame header message; wherein the first frame header message is a message sent by the network configuration master station to the terminal offline monitoring module through the encryption module to request data polling, and the second frame header message is a message sent by the network configuration master station to the terminal offline monitoring module through the encryption module to request link state; the second self-check message comprises 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 network configuration master station and carrying state 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 network configuration master station and confirming link state information.

[0056] 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 above technical solution has the advantage that the identification accuracy of the power distribution automation terminal fault is improved through detection of the data polling and link state message data.

[0058] On the basis of the above embodiment, the first control unit is specifically configured to:

[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, jump to step A3; if no, jump to step A5;

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

[0062] A4, if yes, determine that the power 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 power distribution automation terminal is non-response;

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

[0066] A8, if yes, determine that the power distribution automation terminal has no fault; if no, determine that the fault of the power distribution automation terminal is non-response.

[0067] In order to more accurately analyze the messages of each port in the data storage module, the embodiments of the application can further set a timer and a counter. Figure 3A control flowchart of the first control unit provided in the embodiment of the present application is shown in Figure 3

[0068] It is assumed that the first frame header message is 10 7a frame header message, the second frame header message is 10 49 frame header message, the third frame header message is 68 frame header message, and the fourth frame header message is 10 0b frame header message.

[0069] After it is determined that the data of the first port does not include 10 7a frame header message and 10 49 frame header message, it can be determined whether the first port includes 10 frame header message, so as to determine whether the frame header error is caused by the encryption module.

[0070] It should be noted that the first frame header message can be detected first, and then the second frame header message is detected, which is not limited in the embodiment of the present application.

[0071] On the basis of the above embodiment, the second control unit is specifically used for:

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

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

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

[0075] B4, if yes, determining that the power distribution automation terminal is fault-free; if no, determining that the fault of the power distribution automation terminal is communication abnormality;

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

[0077] B6, if yes, jumping to step B7; if no, determining that the fault of the power distribution automation terminal is non-response;

[0078] B7, determining whether the data of the first port is the first frame header message;

[0079] B8, if yes, determining that the power distribution automation terminal is fault-free; if no, determining that the fault of the power distribution automation terminal is 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 can further set a timer and a counter. Figure 4 A control flowchart of the second control unit provided in the embodiment of the present application is shown in Figure 4

[0081] ​​Assuming that the first frame header message is 10 7a frame header message, the second frame header message is 10 49 frame header message, the third frame header message is 68 frame header message, and the fourth frame header message is 10 0b frame header message.

[0082] It should be noted that the third frame header message can also be detected first, and then the fourth frame header message is detected, which is not limited by the embodiment of the application.

[0083] Figure 5 A flowchart of a monitoring method of a power distribution automation terminal provided by the embodiment of the application is shown in FIG. 1. Figure 5 As shown in the figure, the method of the embodiment specifically includes the following steps.

[0084] S510, sending, by the encryption module, a first self-check message to the terminal offline monitoring module based on the target communication link, and storing the first self-check message to a first port of the data storage module.

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

[0086] S530, receiving, by the encryption module, the second self-check message sent by the terminal offline monitoring module.

[0087] S540, determining, by the controller module, a fault of the power distribution automation terminal based on a preset message interaction logic, judging the first self-check message and the second self-check message stored in the data storage module.

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

[0089] determining, based on the preset message interaction logic, whether the data of the first port is the first self-check message; if yes, determining whether the data of the second port is the second self-check message; if no, determining that the fault of the power distribution automation terminal is no response;

[0090] determining, based on the preset message interaction logic, whether the message of the second port is the second self-check message; if yes, determining whether the data of the first port is the first self-check message; if no, determining that the fault of the power distribution automation terminal is communication abnormality.

[0091] The embodiment of the application provides a kind of power distribution automation terminal monitoring method, this method is by in terminal offline monitoring module in series between original power distribution automation terminal and encryption module communication link, to realize timely monitoring to power distribution automation terminal fault based on message interaction logic, improve the operation and maintenance efficiency and accuracy of power distribution automation terminal.

[0092] It should be understood that the steps can be reordered, added, or deleted using the various forms of flow shown above. For example, the steps described in the present application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which are not limited herein.

[0093] The above detailed description does not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand 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 the present application shall be included in the scope of protection of the present application.

Claims

1. A monitoring system for a power distribution automation terminal, characterized in that, The system includes 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 via a target communication link, and the terminal offline monitoring module is connected in series on the target communication link. 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, and to receive a first self-test message sent by the encryption module, and to store the second self-test message in the second port of the data storage module; wherein, the content of the first self-test message corresponds to that of the second self-test message; The encryption module is also 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 the preset message interaction logic, and determine the fault of the power distribution automation terminal. The controller module includes: The first control unit is 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, whether the data of the second port is the second self-test message; if not, whether the fault of the power distribution automation terminal is no response. The second control unit is used to determine, based on a preset message interaction logic, whether the message of the second port is the second self-test message; if so, whether the data of the first port is the first self-test message; if not, whether the fault of the power distribution automation terminal is a communication abnormality. 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 retrieval 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.

2. The system according to claim 1, characterized in that, 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 the second self-test message to the second buffer based on the target communication link; The controller module is configured to, if it detects that data exists in the first buffer, send the data stored in the first buffer to the terminal offline monitoring module and the first port of the data storage module, and pause 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 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 first control unit is specifically used for: A1. Based on the preset message interaction logic, determine whether the data of the first port is the first frame header message; A2. If yes, proceed to step A3; if no, proceed to step A5. A3. Determine whether the data at the second port is the third frame header message; A4. If so, then the power distribution automation terminal is determined to be fault-free; If not, proceed to step A5; A5. Determine whether the data at the first port is the second frame header message; A6. If yes, then proceed to step A7; If not, then the fault of the power distribution automation terminal is determined to be no response; A7. Determine whether the data at the second port is the fourth frame header message; A8. If yes, then the power distribution automation terminal is determined to be fault-free; if no, then the fault of the power distribution automation terminal is determined to be no response.

4. The system according to claim 1, characterized in that, The second control unit is specifically used for: B1. Based on the preset message interaction logic, determine whether the data of the second port is the fourth frame header message; B2. If yes, then proceed to step B3; If not, proceed to step B5; B3. Determine whether the data at the first port is the second frame header message; B4. If so, then the power distribution automation terminal is determined to be fault-free; If not, then the fault of the power distribution automation terminal is determined to be a communication abnormality; B5. Determine whether the data at the second port is the third frame header message; B6. If yes, proceed to step B7; if no, determine that the fault of the power distribution automation terminal is no response. B7. Determine whether the data at the first port is the first frame header message; B8. If yes, then the power distribution automation terminal is determined to be fault-free; if no, then the fault of the power distribution automation terminal is determined to be a communication abnormality.

5. 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 communication signals passing through the target communication link.

6. The system according to claim 1, characterized in that, 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 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 disconnected.

7. A monitoring method for a power 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, 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 on the target communication link; wherein the method includes: The encryption module sends a first self-test message to the terminal offline monitoring module based on the target communication link, and stores the first self-test message in the first port of the data storage module. The terminal offline monitoring module sends a second self-test message to the encryption module based on the target communication link, and receives a first self-test message sent by the encryption module, and stores the second self-test message in the second port of the data storage module; wherein the content of the first self-test message corresponds to that of the second self-test message. The encryption module receives the second self-test message sent by the terminal offline monitoring module. The controller module, based on preset message interaction logic, judges the first self-test message and the second self-test message stored in the data storage module to determine the fault of the power distribution automation terminal. The step of determining the fault of the power distribution automation terminal by judging the first self-test message and the second self-test message stored in the data storage module based on the preset message interaction logic through the controller module includes: Based on the preset message interaction logic, it is determined whether the data of the first port is the first self-test message; if so, it is determined whether the data of the second port is the second self-test message; if not, it is determined that the fault of the power distribution automation terminal is no response. Based on preset message interaction logic, it is determined whether the message of the second port is the second self-test message; if so, it is determined whether the data of the first port is the first self-test message; if not, it is determined that the fault of the distribution automation terminal is a communication abnormality; wherein, 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 recall 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.

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