Electric power tunnel monitoring system and monitoring data secure transmission method

Abstract

The invention discloses an electric power tunnel monitoring system and a monitoring data secure transmission method, and relates to the technical field of electric power tunnel monitoring, the system comprises a remote monitoring platform, and a plurality of access gateways and tunnel monitoring equipment arranged in an electric power tunnel; the plurality of tunnel monitoring devices are electrically connected with the plurality of access gateways in a one-to-one correspondence manner, and the plurality of access gateways communicate with the remote monitoring platform; the tunnel monitoring equipment is used for monitoring the environment information and the cable state information of the power tunnel in real time and storing the monitoring information by adopting a local nonvolatile FIFO (First In First Out) storage mechanism; the access gateway is used for carrying out data transmission by adopting a user-defined DMA (Direct Memory Access) multi-frame transmission protocol and transmitting the data stored in the tunnel monitoring equipment to the remote monitoring platform; and the remote monitoring platform is used for receiving the monitoring data of the tunnel monitoring equipment and visually displaying the monitoring data. Through non-volatile FIFO storage, power supply redundancy and a reliable transmission protocol, the security of storage and transmission of key node data of power tunnel monitoring is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of power tunnel monitoring, and in particular to a power tunnel monitoring system and a method for securely transmitting monitoring data. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, in order to meet the growing demand for electricity load, underground power transmission networks based on power cable tunnels have been widely developed and constructed. In order to ensure the safe and stable operation of the trunk cables in the power tunnel, it is usually necessary to monitor and inspect the operating conditions of the cables (such as cable grounding current, cable fault current, etc.) and environmental information (such as toxic and harmful gases in the tunnel, air oxygen content, water level, etc.). The existing monitoring methods in power tunnel cable management include manual inspection methods, but the current manual inspection methods have the defects of large investment in manpower and material costs and the inability to monitor in real time. With the development of intelligence, it is currently proposed to deploy intelligent tunnel monitoring devices at the corresponding positions of the power tunnel for real-time monitoring, and transmit the monitoring information to the remote monitoring platform for visual display. This method can avoid the disadvantages of manual inspection methods, improve efficiency and reduce costs.

[0004] However, the power tunnel environment is complex, and the working environment of the monitoring equipment in the power tunnel is complex. When an emergency occurs, there is often strong electromagnetic interference, which will affect the data monitoring and remote transmission of the monitoring equipment, causing data loss and making it impossible to achieve reliable data storage and transmission. Moreover, the data when the fault occurs is key data for analyzing the operating status of the power cable. The loss of this important data will lead to difficulties in subsequent fault analysis and other disadvantages. Summary of the invention

[0005] In order to address the deficiencies of the above-mentioned prior art, the present invention provides a power tunnel monitoring system and a method for secure transmission of monitoring data, and designs redundant protection methods from aspects such as software and hardware. Through non-ferroelectric FIFO storage, power supply redundancy, and reliable transmission protocols, the security of data transmission at key nodes of power tunnel monitoring equipment is ensured, and the safe, stable, and reliable recording, storage, and transmission of power tunnel monitoring data are ensured, thereby solving the problems of poor data security and easy loss in existing power tunnel monitoring systems.

[0006] In a first aspect, the present invention provides a power tunnel monitoring system.

[0007] A power tunnel monitoring system includes a remote monitoring platform and a plurality of access gateways and tunnel monitoring devices arranged in a power tunnel; wherein the plurality of tunnel monitoring devices are electrically connected to the plurality of access gateways in a one-to-one correspondence, and the plurality of access gateways communicate with the remote monitoring platform;

[0008] The tunnel monitoring device is used to monitor the environmental information and cable status information of the power tunnel in real time, and uses a local non-volatile FIFO storage mechanism to store the monitoring information;

[0009] The access gateway is used to transmit the monitoring data stored in the tunnel monitoring device to the remote monitoring platform by adopting a custom DMA multi-frame transmission protocol for data transmission;

[0010] The remote monitoring platform is used to receive monitoring data from tunnel monitoring equipment and display it visually.

[0011] A further technical solution is that the access gateway has a built-in power supply control unit and an energy storage unit;

[0012] The energy storage unit is used to provide auxiliary power supply for the access gateway itself and the corresponding tunnel monitoring equipment;

[0013] The power supply control unit is used to control the energy storage unit to provide auxiliary power supply according to the detected external normal power supply output condition.

[0014] A further technical solution is to transmit data between the tunnel monitoring device and the monitoring platform based on the access gateway through a custom DMA multi-frame transmission protocol, and the custom DMA multi-frame transmission protocol supports retransmission, breakpoint resumption, and timeout reset mechanisms.

[0015] A further technical solution is that the custom DMA multi-frame transmission protocol includes a protocol header, a protocol version, a protocol length, a protocol type, a transmission time stamp, frame information, data content, and a protocol check; wherein the frame information includes the total number of frames and the current frame sequence number, and the transmission time stamp is used to feedback the time required for the next frame of data transmission.

[0016] In a further technical solution, the data transmission process is as follows:

[0017] Regular inspection of the monitoring platform;

[0018] The tunnel monitoring device initiates a DMA upload request for data transmission; wherein the DMA upload request includes the total number of frames of this data transmission, the current frame sequence number, and the transmission time stamp;

[0019] The monitoring platform receives the DMA upload request, and counts according to the transmission time stamp in the DMA upload request. After the timing exceeds the transmission time stamp, it sends a current frame data acquisition instruction to the tunnel monitoring device;

[0020] The tunnel monitoring device responds and feeds back the current frame data;

[0021] The monitoring platform receives the feedback of the current frame data and times it again. After the timing exceeds the transmission time mark, it sends a request for the next frame of data to the tunnel monitoring device, and the cycle continues until the data transmission is completed.

[0022] In a further technical solution, the retransmitted data transmission process is as follows:

[0023] When the monitoring platform sends a next frame data acquisition instruction to the tunnel monitoring device and the tunnel monitoring device does not respond, the monitoring platform will send the next frame data acquisition instruction to the tunnel monitoring device again after the timing exceeds the transmission time mark;

[0024] The tunnel monitoring device responds and re-feeds back the current frame data.

[0025] In a further technical solution, the data transmission process of the breakpoint-resume transmission is as follows:

[0026] When the monitoring platform sends a next frame data acquisition instruction to the tunnel monitoring device and the tunnel monitoring device does not respond, the monitoring platform will send the next frame data acquisition instruction to the tunnel monitoring device again after the timing exceeds the transmission time mark;

[0027] If the tunnel monitoring device does not respond, the next frame data acquisition instruction is repeatedly sent to the tunnel monitoring device until the set number of times is reached or the tunnel monitoring device responds.

[0028] In a further technical solution, the data transmission process of the timeout reset is as follows:

[0029] When the monitoring platform sends a next frame data acquisition instruction to the tunnel monitoring device and the tunnel monitoring device does not respond, the monitoring platform will send the next frame data acquisition instruction to the tunnel monitoring device again after the timing exceeds the transmission time mark;

[0030] After repeating the set number of times, if the tunnel monitoring device still does not respond, the monitoring platform will enter the scheduled inspection again, the tunnel monitoring device will initiate the DMA upload request for data transmission again, and the monitoring platform will re-enter the DMA data retrieval process.

[0031] In a second aspect, the present invention provides a method for securely transmitting power tunnel monitoring data.

[0032] A method for securely transmitting power tunnel monitoring data is implemented based on the above-mentioned power tunnel monitoring system, and the method comprises:

[0033] Use tunnel monitoring equipment to monitor the environment information and cable status information of the power tunnel in real time, and use a local non-volatile FIFO storage mechanism to store the monitoring information;

[0034] By accessing the gateway, a custom DMA multi-frame transmission protocol is used to transmit the monitoring data to the remote monitoring platform.

[0035] Further technical solution, the custom DMA multi-frame transmission protocol supports retransmission, breakpoint resume, and timeout reset mechanism; the data transmission process is:

[0036] Regular inspection of the monitoring platform;

[0037] The tunnel monitoring device initiates a DMA upload request for data transmission; wherein the DMA upload request includes the total number of frames of this data transmission, the current frame sequence number, and the transmission time stamp;

[0038] The monitoring platform receives the DMA upload request, and counts according to the transmission time stamp in the DMA upload request. After the timing exceeds the transmission time stamp, it sends a current frame data acquisition instruction to the tunnel monitoring device;

[0039] The tunnel monitoring device responds and feeds back the current frame data;

[0040] The monitoring platform receives the feedback of the current frame data and times it again. After the timing exceeds the transmission time mark, it sends a request for the next frame of data to the tunnel monitoring device, and the cycle continues until the data transmission is completed.

[0041] One or more of the above technical solutions have the following beneficial effects:

[0042] 1. The present invention provides a power tunnel monitoring system and a method for secure transmission of monitoring data. Redundancy protection methods are designed from aspects such as software and hardware. Through non-ferroelectric FIFO storage, power supply redundancy, and reliable transmission protocols, the security of data transmission at key nodes of power tunnel monitoring equipment is ensured, and the safe, stable, and reliable recording, storage, and transmission of power tunnel monitoring data are ensured, thereby solving the problems of poor data security and easy loss in existing power tunnel monitoring systems.

[0043] 2. The present invention proposes a reliable custom DMA transmission protocol. Through the designed retransmission, power-off resume transmission, and timeout reset mechanisms, it ensures that the monitoring data is reliably transmitted to the remote monitoring platform, ensures the security and integrity of the monitoring information uploaded in the power tunnel monitoring system, and while ensuring the data upload efficiency of the device terminal, it can also prevent the timeliness of reporting other key status information of the terminal caused by the blocking of DMA multi-frame information.

[0044] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0046] Figure 1 A schematic diagram of a power tunnel monitoring system according to an embodiment of the present invention;

[0047] Figure 2 A schematic diagram of the connection between various devices in the power tunnel monitoring system according to an embodiment of the present invention;

[0048] Figure 3 A schematic diagram of a power supply redundancy design in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] It should be noted that the following detailed descriptions are exemplary only, are intended to describe specific embodiments, are intended to provide further explanation of the present invention, and are not intended to limit exemplary embodiments according to the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] Embodiment 1

[0051] This embodiment provides a power tunnel monitoring system that can achieve reliable recording, storage, and transmission of effective monitoring data. Figure 1 As shown, the system includes a remote monitoring platform and multiple access gateways and tunnel monitoring devices deployed in the power tunnel; wherein the multiple tunnel monitoring devices are deployed according to the specific required monitoring positions, and the multiple tunnel monitoring devices are electrically connected and communicated with the multiple access gateways one by one. In this embodiment, the tunnel monitoring devices and the access gateways communicate using RS485 bus; and the multiple access gateways are interconnected through the optical fiber ring network switch to realize the data link layer switching architecture. At the application layer, each access gateway is directly connected to the monitoring platform through TCP for data communication transmission, such as Figure 2 As shown, multiple access gateways communicate with the remote monitoring platform, specifically using Ethernet for communication and data transmission.

[0052] Furthermore, the power tunnel monitoring system proposed in this embodiment is improved mainly in the following three aspects:

[0053] (1) Improve the storage mechanism of the tunnel monitoring device and adopt a local non-volatile FIFO storage mechanism. In this embodiment, the tunnel monitoring device is used to monitor the environmental information and cable status information of the power tunnel in real time, and adopts a local non-volatile FIFO storage mechanism to store the monitoring information.

[0054] Specifically, the tunnel monitoring equipment stores the monitoring data in the local ferroelectric memory. By using the parallel interface ferroelectric memory for storage, it not only ensures the storage speed, but also ensures that the data will not be lost when the equipment loses power due to problems such as failure. Moreover, the data is stored in FIFO storage mode, and the FIFO depth can be flexibly configured according to the data length.

[0055] In addition, the frame information of data transmission is also stored in the ferroelectric memory. After power is restored, the data can be resumed and the data can be quickly and reliably uploaded to the remote monitoring platform.

[0056] (2) Power supply redundancy design. In this embodiment, in addition to being used for communication transmission, the access gateway also has a power supply control unit and an energy storage unit built into the access gateway. Figure 3 As shown, under normal circumstances, the tunnel monitoring equipment is powered by an external normal power supply. Taking into account the problem of suddenness of a single power supply method, this embodiment introduces an energy storage unit in the access gateway, which is output together with the normal power supply. The power supply control unit can be used to control the energy storage unit to perform auxiliary power supply according to the detected external normal power supply output, so as to achieve switching between the energy storage unit and the normal power supply, and then the energy storage unit can be used to provide auxiliary power supply (i.e., short-term power supply) for the access gateway itself and the corresponding tunnel monitoring equipment, so that the tunnel monitoring equipment can have sufficient time to save the data locally, thereby preventing data loss caused by power outages in the tunnel and direct power outages of the tunnel monitoring equipment in the event of an emergency.

[0057] (3) Design a reliable output transmission protocol. In this embodiment, the access gateway uses a custom DMA multi-frame transmission protocol for data transmission, thereby transmitting the monitoring data stored in the tunnel monitoring device to the remote monitoring platform, which receives the monitoring data of the tunnel monitoring device and displays it visually.

[0058] Specifically, based on the access gateway, data is transmitted between the tunnel monitoring device and the monitoring platform through a custom DMA multi-frame transmission protocol. The custom DMA multi-frame transmission protocol includes a protocol header, protocol version, protocol length, protocol type, transmission time stamp, frame information, data content, protocol check, etc., where the frame information includes the total number of frames and the current frame sequence number; moreover, the protocol supports mechanisms such as retransmission, breakpoint resume, and timeout reset. Data transmission through this protocol can automatically resume transmission according to the frame sequence number after power-on in the event of a power outage in the monitoring device, thereby ensuring the security and integrity of monitoring data transmission.

[0059] Furthermore, the access gateway has a built-in real-time operating system that can perform precise timing control; the custom DMA transmission protocol can be used exclusively for large data frame transmission between the platform and the device terminal. In this embodiment, the monitoring platform and the access gateway are transparently transmitted, and the platform can perform RS485 data link transmission through the host.

[0060] Specifically, the transmission timestamp is used by the tunnel monitoring device to feedback to the monitoring platform the time required for the next frame of data transmission. After this time period has passed, the platform can request subsequent data. That is, since the frame information contains the total number of frames and the current frame sequence number, when the terminal device does not respond, the platform can repeatedly request data from the terminal based on the frame information after a timeout (the timeout period is the time marked by the transmission timestamp). The reliable transmission and arrival of data is ensured through retransmission, power-off resumption, and timeout reset mechanisms.

[0061] In this embodiment, the process of using the custom DMA multi-frame transmission protocol to perform data transmission is as follows:

[0062] Regular inspection of the monitoring platform;

[0063] The tunnel monitoring device initiates a DMA upload request for data transmission; wherein the DMA upload request includes the total number of frames of this data transmission, the current frame sequence number (such as the first frame), and the transmission time stamp;

[0064] The monitoring platform receives the DMA upload request, and according to the transmission time stamp in the DMA upload request (this is the transmission time stamp of the first frame, and the first frame transmission time stamp is the default value), after the timing exceeds the transmission time stamp, it sends the current frame (i.e., the first frame) data acquisition instruction to the tunnel monitoring device;

[0065] The tunnel monitoring device responds and feeds back the current frame data;

[0066] The monitoring platform receives the feedback of the current frame data and starts timing again. After the timing exceeds the transmission time mark (this is the transmission time mark of the next frame), it sends the next frame data acquisition instruction to the tunnel monitoring device. The cycle continues, and the monitoring platform can continue to request the subsequent N-th frame data until the data transmission is completed.

[0067] Furthermore, within the above transmission time scale (i.e., transmission duration), the device terminal can transmit other information that does not use the DMA transmission protocol to the platform, which can not only ensure the data upload efficiency of the device terminal, but also prevent the timeliness of reporting other key status information of the terminal caused by the blocking of DMA multi-frame information. In addition, within each transmission time scale, the terminal that shares the data link with the terminal device is silent through the transmission time scale to prevent bus data conflicts.

[0068] The custom DMA transmission protocol proposed in this embodiment supports mechanisms such as retransmission, breakpoint resume, and timeout reset, among which:

[0069] (3.1) The data transmission process of retransmission is:

[0070] When the monitoring platform sends a next frame data acquisition instruction to the tunnel monitoring device and the tunnel monitoring device does not respond, the monitoring platform will send the next frame data acquisition instruction to the tunnel monitoring device again after the timing exceeds the transmission time mark;

[0071] The tunnel monitoring device responds and re-feeds back the current frame data.

[0072] (3.2) The data transmission process of breakpoint resume is as follows:

[0073] When the monitoring platform sends a next frame data acquisition instruction to the tunnel monitoring device and the tunnel monitoring device does not respond, the monitoring platform will send the next frame data acquisition instruction to the tunnel monitoring device again after the timing exceeds the transmission time mark;

[0074] If the tunnel monitoring device does not respond, the next frame data acquisition instruction is repeatedly sent to the tunnel monitoring device until the set number of times is reached or the tunnel monitoring device responds.

[0075] (3.3) The data transmission process of timeout reset is:

[0076] When the monitoring platform sends a next frame data acquisition instruction to the tunnel monitoring device and the tunnel monitoring device does not respond, the monitoring platform will send the next frame data acquisition instruction to the tunnel monitoring device again after the timing exceeds the transmission time mark;

[0077] After repeating the set number of times, if the tunnel monitoring device still does not respond, the monitoring platform will enter the scheduled inspection again, the tunnel monitoring device will initiate the DMA upload request for data transmission again, and the monitoring platform will re-enter the DMA data retrieval process.

[0078] Specifically, the data transmission process under the above-mentioned various mechanisms is as follows:

[0079] Regular inspection of the monitoring platform;

[0080] The tunnel monitoring device initiates a DMA upload request for data transmission; wherein the DMA upload request includes the total number of frames of this data transmission, the current frame sequence number (the Nth frame), and the transmission time stamp (i.e., the time required for the next frame transmission);

[0081] The monitoring platform receives the DMA upload request, and counts according to the transmission time stamp in the DMA upload request. After the timing exceeds the transmission time stamp, it sends a current frame (Nth frame) data acquisition instruction to the tunnel monitoring device;

[0082] The tunnel monitoring device responds and feeds back the current frame (Nth frame) data;

[0083] The monitoring platform receives the current frame data fed back and times it again. After the timing exceeds the transmission time mark, it sends a request instruction for the next frame (N+1 frame) of data to the tunnel monitoring device.

[0084] The tunnel monitoring device does not respond to the next frame (N+1 frame) data;

[0085] After the monitoring platform timing exceeds the transmission time mark, it sends the next frame of data acquisition instruction to the tunnel monitoring equipment again;

[0086] If the tunnel monitoring device still does not respond, the next frame data acquisition instruction is repeatedly sent to the tunnel monitoring device until the set number of times is reached or the tunnel monitoring device responds; the set number of times in this embodiment is 3 times;

[0087] After repeating the set number of times, if the tunnel monitoring equipment still does not respond, the monitoring platform will enter the scheduled inspection again;

[0088] The tunnel monitoring device initiates a DMA upload request for data transmission again, wherein the DMA upload request includes the total number of frames of this data transmission, the current frame sequence number (the N+1th frame), and the transmission time stamp;

[0089] The monitoring platform re-enters the DMA data retrieval process.

[0090] This embodiment adopts the above-mentioned custom DMA transmission protocol, which can ensure the reliable transmission of monitoring data to the remote monitoring platform through retransmission, power-off resumption, and timeout reset mechanisms, thereby ensuring the security and integrity of the monitoring information uploaded in the power tunnel monitoring system, and while ensuring the data upload efficiency of the device terminal, it can also prevent the timeliness of reporting other key status information of the terminal caused by the blocking of DMA multi-frame information.

[0091] Embodiment 2

[0092] This embodiment provides a method for securely transmitting monitoring data of a power tunnel, which is implemented based on the power tunnel monitoring system proposed in Embodiment 1. The method includes:

[0093] Use tunnel monitoring equipment to monitor the environment information and cable status information of the power tunnel in real time, and use a local non-volatile FIFO storage mechanism to store the monitoring information;

[0094] By accessing the gateway, a custom DMA multi-frame transmission protocol is used to transmit the monitoring data to the remote monitoring platform.

[0095] Furthermore, the process of using the custom DMA multi-frame transmission protocol for data transmission is as follows:

[0096] Regular inspection of the monitoring platform;

[0097] The tunnel monitoring device initiates a DMA upload request for data transmission; wherein the DMA upload request includes the total number of frames of this data transmission, the current frame sequence number (such as the first frame), and the transmission time stamp;

[0098] The monitoring platform receives the DMA upload request, and according to the transmission time stamp in the DMA upload request (this is the transmission time stamp of the first frame, and the first frame transmission time stamp is the default value), after the timing exceeds the transmission time stamp, it sends the current frame (i.e., the first frame) data acquisition instruction to the tunnel monitoring device;

[0099] The tunnel monitoring device responds and feeds back the current frame data;

[0100] The monitoring platform receives the feedback of the current frame data and starts timing again. After the timing exceeds the transmission time mark (this is the transmission time mark of the next frame), it sends the next frame data acquisition instruction to the tunnel monitoring device. The cycle continues, and the monitoring platform can continue to request the subsequent N-th frame data until the data transmission is completed.

[0101] In addition, the above-mentioned custom DMA multi-frame transmission protocol supports retransmission, breakpoint resume, and timeout reset mechanisms. Through this protocol, the monitoring data can be reliably transmitted to the remote monitoring platform, ensuring the security and integrity of the monitoring information uploaded in the power tunnel monitoring system. The steps involved in the above embodiment 2 correspond to the method embodiment 1. The specific implementation method can be found in the relevant description part of embodiment 1, which will not be repeated here.

[0102] Those skilled in the art should understand that the modules or steps of the present invention described above can be implemented by a general-purpose computer device, or alternatively, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0103] The above description is only a preferred embodiment of the present invention. Although the specific implementation mode of the present invention is described in conjunction with the accompanying drawings, it is not a limitation of the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the protection scope of the present invention.

Claims

1. A power tunnel monitoring system, characterized in that: It includes a remote monitoring platform and multiple access gateways and tunnel monitoring devices arranged in the power tunnel; wherein the multiple tunnel monitoring devices are electrically connected to the multiple access gateways in a one-to-one correspondence, and the multiple access gateways communicate with the remote monitoring platform; The tunnel monitoring device is used to monitor the environmental information and cable status information of the power tunnel in real time, and uses a local non-volatile FIFO storage mechanism to store the monitoring information; The access gateway is used to transmit the monitoring data stored in the tunnel monitoring device to the remote monitoring platform by adopting a custom DMA multi-frame transmission protocol for data transmission; The remote monitoring platform is used to receive monitoring data from tunnel monitoring equipment and display it visually.

2. A power tunnel monitoring system as claimed in claim 1, characterized in that: The access gateway has a built-in power supply control unit and an energy storage unit; The energy storage unit is used to provide auxiliary power supply for the access gateway itself and the corresponding tunnel monitoring equipment; The power supply control unit is used to control the energy storage unit to provide auxiliary power supply according to the detected external normal power supply output condition.

3. A power tunnel monitoring system as claimed in claim 1, characterized in that: Based on the access gateway, data is transmitted between the tunnel monitoring device and the monitoring platform through a custom DMA multi-frame transmission protocol, and the custom DMA multi-frame transmission protocol supports retransmission, breakpoint resumption, and timeout reset mechanisms.

4. A power tunnel monitoring system as claimed in claim 3, characterized in that: The custom DMA multi-frame transmission protocol includes a protocol header, a protocol version, a protocol length, a protocol type, a transmission time stamp, frame information, data content, and a protocol check; wherein the frame information includes the total number of frames and the current frame sequence number, and the transmission time stamp is used to feedback the time required for the next frame of data transmission.

5. A power tunnel monitoring system as claimed in claim 3, characterized in that: The process of data transmission using a custom DMA multi-frame transmission protocol is as follows: Regular inspection of the monitoring platform; The tunnel monitoring device initiates a DMA upload request for data transmission; wherein the DMA upload request includes the total number of frames of this data transmission, the current frame sequence number, and the transmission time stamp; The monitoring platform receives the DMA upload request, and counts according to the transmission time stamp in the DMA upload request. After the timing exceeds the transmission time stamp, it sends a current frame data acquisition instruction to the tunnel monitoring device; The tunnel monitoring device responds and feeds back the current frame data; The monitoring platform receives the feedback of the current frame data and times it again. After the timing exceeds the transmission time mark, it sends a request for the next frame of data to the tunnel monitoring device, and the cycle continues until the data transmission is completed.

6. A power tunnel monitoring system as claimed in claim 5, characterized in that: The retransmitted data transmission process is as follows: When the monitoring platform sends a next frame data acquisition instruction to the tunnel monitoring device and the tunnel monitoring device does not respond, the monitoring platform will send the next frame data acquisition instruction to the tunnel monitoring device again after the timing exceeds the transmission time mark; The tunnel monitoring device responds and re-feeds back the current frame data.

7. A power tunnel monitoring system as claimed in claim 5, characterized in that: The data transmission process of the breakpoint-resume transmission is as follows: When the monitoring platform sends a next frame data acquisition instruction to the tunnel monitoring device and the tunnel monitoring device does not respond, the monitoring platform will send the next frame data acquisition instruction to the tunnel monitoring device again after the timing exceeds the transmission time mark; If the tunnel monitoring device does not respond, the next frame data acquisition instruction is repeatedly sent to the tunnel monitoring device until the set number of times is reached or the tunnel monitoring device responds.

8. A power tunnel monitoring system as claimed in claim 5, characterized in that: The data transmission process of the timeout reset is as follows: When the monitoring platform sends a next frame data acquisition instruction to the tunnel monitoring device and the tunnel monitoring device does not respond, the monitoring platform will send the next frame data acquisition instruction to the tunnel monitoring device again after the timing exceeds the transmission time mark; After repeating the set number of times, if the tunnel monitoring device still does not respond, the monitoring platform will enter the scheduled inspection again, the tunnel monitoring device will initiate the DMA upload request for data transmission again, and the monitoring platform will re-enter the DMA data retrieval process.

9. A method for secure transmission of power tunnel monitoring data, characterized in that: Based on the implementation of the power tunnel monitoring system according to any one of claims 1 to 8, the method comprises: Use tunnel monitoring equipment to monitor the environment information and cable status information of the power tunnel in real time, and use a local non-volatile FIFO storage mechanism to store the monitoring information; By accessing the gateway, a custom DMA multi-frame transmission protocol is used to transmit the monitoring data to the remote monitoring platform.

10. A method for secure transmission of power tunnel monitoring data according to claim 9, characterized in that: The custom DMA multi-frame transmission protocol supports retransmission, breakpoint resume, and timeout reset mechanisms; the process of using the custom DMA multi-frame transmission protocol for data transmission is as follows: Regular inspection of the monitoring platform; The tunnel monitoring device initiates a DMA upload request for data transmission; wherein the DMA upload request includes the total number of frames of this data transmission, the current frame sequence number, and the transmission time stamp; The monitoring platform receives the DMA upload request, and counts according to the transmission time stamp in the DMA upload request. After the timing exceeds the transmission time stamp, it sends a current frame data acquisition instruction to the tunnel monitoring device; The tunnel monitoring device responds and feeds back the current frame data; The monitoring platform receives the feedback of the current frame data and times it again. After the timing exceeds the transmission time mark, it sends a request for the next frame of data to the tunnel monitoring device, and the cycle continues until the data transmission is completed.

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