Remote operation and maintenance method and system for secondary equipment of intelligent substation

Abstract

The invention discloses an intelligent substation secondary equipment remote operation and maintenance method and system, and relates to the technical field of power system automation. According to the method, an integrated remote operation and maintenance system is constructed by deploying an intelligent remote operation platform at a master station end and deploying a secondary equipment intelligent terminal at a station end. The system automatically configures communication based on an SCD file, and acquires operation data of secondary equipment of the whole station; and the master station subscribes data as required, so that hierarchical and scenarized panoramic monitoring is realized. Three independent channels of operation and maintenance management, remote operation and maintenance and data acquisition are set, and white list, work order approval and SM2 / SM4 encryption authentication strategies are adopted, so that four types of remote operation of pressing plate operation, fixed value operation, device resetting and equipment emergency operation are safely realized. According to the method, the problems of low efficiency and high safety risk of a traditional on-site operation and maintenance mode are solved, the operation and maintenance quality is improved, and digital transformation of operation and maintenance of the secondary equipment of the transformer substation is promoted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power system automation, in particular to a method and system for remote operation and maintenance of secondary equipment in an intelligent substation. BACKGROUND

[0002] The construction of smart grid is also accompanied by the construction of a new type of power system with new energy as the main body. The grid structure will become more and more complex, and the total amount of secondary equipment to be maintained will further increase, and the operation risk will become greater and greater. The traditional (on-site) maintenance mode has low efficiency, and the maintenance operation needs to go back and forth to the site, which consumes time and energy, and the maintenance quality needs to be improved. The maintenance is difficult, the risk pre-control ability is insufficient, and all levels in the network are promoting the optimization of production organization mode.

[0003] Virtualization of secondary circuits brings new challenges to substation maintenance. Li Yudun et al. proposed a secondary equipment intelligent maintenance technology scheme and intelligent application in view of the current smart substation field operation and maintenance requirements, including automatic inspection of pressure plate state, sequential execution of secondary safety measures and other functions. Luo Fei, Zheng Mingzhong, et al. carried out research on efficient operation and maintenance of substation secondary equipment based on general service protocol (GSP) of power system. For the first time, the integrated operation and maintenance architecture of substation secondary equipment was designed, and the integrated operation and maintenance information modeling method of substation secondary equipment based on substation operation and maintenance capability language (SOMCL) was proposed. Guo Lijun of XJ Group designed and developed an online management and control system. The overall architecture design scheme of the system is elaborated, and the implementation process of each main function module is discussed from the perspective of system function. The trial application effect in the smart substation shows that the system can compress the operation time to less than 20% of the original, greatly improving the work efficiency, standardizing the operation process, effectively reducing the probability of manual operation error, and reducing the operation risk during the operation and maintenance of secondary equipment. Single monitoring and inspection can no longer meet the needs of complex secondary systems. The technical problem to be solved by the present application is to overcome the existing technical defects and provide a rational structure, convenient and efficient integrated remote operation mode.

[0004] With the grid network will become increasingly complex, the total amount of secondary equipment to be operated and maintained will further increase, the operation risk will be greater and greater, the intelligent substation secondary equipment operation and maintenance system based on remote operation is proposed. The paper innovatively forms the "intelligent remote operation platform" of the master station and the "secondary equipment intelligent terminal" of the substation to form the "substation secondary equipment integrated remote operation system". By deploying the substation secondary equipment integrated remote operation system, the operation and maintenance quality of the substation secondary equipment is improved, the operation and maintenance means is enriched, the remote monitoring, remote patrol, remote operation, remote maintenance and intensive management of the substation secondary equipment are realized, and the digital transformation of the substation secondary equipment from "local operation to remote operation" and "dispersed management to intensive management" is supported.

[0005] In the prior art, the Chinese authorized patent CN 118232524 A provides a substation remote operation and maintenance system and method, the system comprises: a local acquisition device for accessing and acquiring video and audio signals of a substation monitoring background, and simultaneously accessing a USB peripheral of a simulated keyboard and mouse to the substation monitoring background, the local acquisition device transmits the video, audio and keyboard and mouse signals to a substation safety remote operation and maintenance terminal through an optical fiber signal; and a substation safety remote operation and maintenance terminal for encoding the audio and video signals and transmitting them to a remote operation and maintenance master station. The hybrid panoramic remote operation and maintenance system and method solve the problems in the prior art, such as the inability to collect substation alarm audio, the high requirement for the substation monitoring background operating system, the inability to realize the whole-process monitoring of the substation monitoring background, and the difficulty in accurately positioning the operation and maintenance abnormalities, and provide an efficient and flexible solution for substation remote operation and maintenance. SUMMARY

[0006] The technical problem to be solved by the present application is to solve the problems of low efficiency, high risk and high cost of the traditional local operation and maintenance mode.

[0007] To achieve the above object, the present application is implemented by the following technical scheme: an intelligent substation secondary equipment remote operation and maintenance method and system, comprising the following steps:

[0008] Step S1: collecting the operation data of the secondary equipment of the whole station through the secondary equipment intelligent terminal deployed in the intelligent substation;

[0009] Step S2: deploying the intelligent remote operation platform at the control master station end, subscribing and receiving the operation data as needed, realizing panoramic monitoring and display of the equipment operation condition;

[0010] Step S3: in response to the remote operation instruction, establishing a remote operation and maintenance channel after security authentication, and executing remote operation on the secondary equipment in the station based on the operation data.

[0011] Further, the method further comprises:

[0012] In the step S1, collecting the operation data of the secondary equipment of the whole station comprises: collecting the device parameters, setting value information, pressure plate state, internal working condition, time synchronization state, operation resource, process resource, fault event and fault file of at least one of the protection device, the measurement and control device, the remote device, the monitoring host, the five-prevention workstation, the PMU and the switch through the IEC 61850 protocol.

[0013] Further, the method further comprises:

[0014] Before the step S1, the method further comprises:

[0015] The secondary equipment intelligent terminal is automatically configured based on the substation configuration description file, and realizes the communication access with the secondary equipment of the whole station.

[0016] The automatic configuration is based on the SCD file, comprising: performing the normative inspection and the visual analysis on the SCD file, inspecting the IED connection and the GOOSE virtual terminal connection, and extracting the data set, the information point table and the setting point table for the MMS communication.

[0017] Further, the method further comprises:

[0018] The method further comprises:

[0019] The operation results of the remote operation are counted, and the operation results at least comprise the total number and the success rate of each of the four operation types of the pressure plate operation, the setting operation, the device reset and the equipment emergency operation.

[0020] Further, the method further comprises:

[0021] The panoramic monitoring and display in the step S2 comprise:

[0022] In a hierarchical and scenario-based manner, the real-time operation conditions of various secondary equipment are displayed in layers and grades.

[0023] It is determined whether there is abnormal secondary equipment operation and maintenance information and an alarm is given;

[0024] The GOOSE communication message, the SV sampling value message and the related event between the associated IEDs are displayed in a time sequence manner.

[0025] Further, the method further comprises:

[0026] In the step S3, the remote operation on the secondary equipment in the station comprises at least one of the following operation types:

[0027] Pressure plate operation: switching on or off the soft pressure plate of the protection device or the measurement and control device;

[0028] Setting operation: Calling or modifying the settings of protection devices, measurement and control devices, or waveform recording devices;

[0029] Device reset: Remotely reset the device status;

[0030] Emergency equipment operation: In emergency scenarios, after verifying the dedicated permissions, the operation can be performed without a work order process, and the entire operation process is recorded and audited.

[0031] Furthermore:

[0032] In step S3, establishing a remote operation and maintenance channel specifically includes:

[0033] Three logically independent channels are established between the main station and the substation;

[0034] The three logically independent channels include: the operation and maintenance management channel, the data acquisition channel, and the remote operation and maintenance channel;

[0035] The operation and maintenance management channel is used for starting and stopping remote operation and maintenance channels, managing terminal devices, and approving work orders;

[0036] The data acquisition channel is used to acquire operating data of substation secondary equipment according to the IEC 61850 protocol;

[0037] The remote operation and maintenance channel is used to enable remote login and remote operation of the substation monitoring backend;

[0038] The remote operation and maintenance channel is closed by default and is only opened by the operation and maintenance management channel based on a whitelist, password, or public / private key authentication policy after the operation and maintenance work order is approved.

[0039] Furthermore:

[0040] The operation and maintenance method also includes a security encryption step:

[0041] The operation and maintenance management channel uses SM2 and SM4 algorithms for encrypted transmission;

[0042] The remote operation and maintenance channel uses a secure tunnel for encrypted transmission.

[0043] A remote operation and maintenance system for secondary equipment in an intelligent substation includes: intelligent terminals for secondary equipment, an intelligent remote operation platform, and a communication network and security channel;

[0044] The secondary equipment intelligent terminal is deployed in the secondary equipment intelligent terminal of the intelligent substation, and the secondary equipment intelligent terminal is used to collect the operating data of all secondary equipment in the station;

[0045] The intelligent remote operation platform is deployed on the control master station terminal. The intelligent remote operation platform is used to subscribe to the operation data on demand to realize panoramic monitoring and remote operation.

[0046] The communication network and security channel are connected between the master station and the substation.

[0047] Compared with the prior art, the present invention has the following advantages:

[0048] This invention completely changes the traditional on-site operation and maintenance model that relies on manual on-site visits by constructing an integrated remote operation and maintenance system of "main station platform + station terminal". It realizes the transformation of "operation and maintenance from on-site to remote, and management from decentralized to intensive", which greatly reduces the time consumption and labor costs of operation and maintenance and improves the speed of emergency response.

[0049] By establishing a logically isolated three-channel architecture, and combining it with multiple security strategies such as whitelisting, work order approval, public and private key authentication, and encryption using national cryptographic algorithms (SM2 / SM4), a defense-in-depth system was constructed, effectively preventing accidental operations and unauthorized access, and significantly reducing security risks. Full-process screen recording and auditing of emergency operations also strengthens the supervision and traceability of the operation process.

[0050] Based on the automatic parsing and configuration of SCD files, plug-and-play and rapid access to all secondary devices in the station are achieved, avoiding tedious manual configuration. The operation and maintenance master station can subscribe to data on demand, perform hierarchical and scenario-based panoramic monitoring, and display GOOSE / SV message correlation events in a time-series manner, making fault location and equipment status assessment more accurate and intuitive.

[0051] The system categorizes remote operations into four standard types: pressure plate, setpoint, reset, and emergency, and statistically analyzes their total number of operations and success rate. This shifts the operation and maintenance work from "experience-driven" to "data-driven," providing reliable data support for optimizing operation and maintenance strategies and evaluating operation and maintenance quality, thereby improving the level of management refinement. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the architecture and main equipment of the intelligent substation secondary equipment remote operation and maintenance system provided by the present invention.

[0053] Figure 2 This is a flowchart of the remote operation and maintenance method of the present invention;

[0054] Figure 3 This is a flowchart of the automatic configuration and data analysis based on SCD files in this invention;

[0055] Figure 4 This is a detailed operation sequence diagram of remote operations (such as setting value modification, pressure plate activation / deactivation) in this invention. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0057] Example 1

[0058] A method for remote operation and maintenance of secondary equipment in an intelligent substation includes the following steps:

[0059] Step S1: Collect the operating data of all secondary equipment in the smart substation through the intelligent terminals of the secondary equipment deployed in the smart substation;

[0060] Step S2: The intelligent remote operation platform deployed on the control master station subscribes to and receives the operation data as needed, realizing panoramic monitoring and display of the equipment's operating status;

[0061] Step S3: In response to the remote operation command, after passing the security authentication, a remote operation and maintenance channel is established, and based on the operation data, remote operation is performed on the secondary equipment in the station.

[0062] Specifically, in step S1, collecting the operating data of all secondary equipment in the station includes: collecting device parameters, setting information, pressure plate status, internal operating conditions, time synchronization status, operating resources, process resources, fault events and fault files of at least one of the protection devices, measurement and control devices, remote control devices, monitoring host, five-prevention workstation, PMU and switch through the IEC 61850 protocol.

[0063] Specifically, the procedure before step S1 includes:

[0064] The intelligent terminal for secondary equipment is automatically configured based on the substation configuration description file to achieve communication access with all secondary equipment in the station.

[0065] The automatic configuration is based on the SCD file and includes: performing standardization checks and visual analysis on the SCD file, checking the IED connection and GOOSE virtual terminal connection, and extracting the dataset, information point table and fixed value point table for MMS communication.

[0066] Specifically, the method further includes:

[0067] The operation results of the remote operation are statistically analyzed, and the operation results include at least the total number and success rate of each of the four operation types: pressure plate operation, set value operation, device reset, and equipment emergency operation.

[0068] Specifically, the panoramic monitoring and display in step S2 includes:

[0069] The real-time operating status of various secondary equipment is displayed in a hierarchical and scenario-based manner, with different levels and grades.

[0070] Determine if there is any abnormal secondary equipment maintenance information and issue an alarm;

[0071] Display the GOOSE communication messages, SV sample value messages, and related events between associated IEDs in a chronological manner.

[0072] Specifically, in step S3, performing remote operations on the secondary equipment within the station includes at least one of the following operation types:

[0073] Pressure plate operation: Soft pressure plate of the activation / deactivation protection device or monitoring and control device;

[0074] Setting operation: Calling or modifying the settings of protection devices, measurement and control devices, or waveform recording devices;

[0075] Device reset: Remotely reset the device status;

[0076] Emergency equipment operation: In emergency scenarios, after verifying the dedicated permissions, the operation can be performed without a work order process, and the entire operation process is recorded and audited.

[0077] Specifically, in step S3, establishing a remote operation and maintenance channel includes:

[0078] Three logically independent channels are established between the main station and the substation;

[0079] The three logically independent channels include: the operation and maintenance management channel, the data acquisition channel, and the remote operation and maintenance channel;

[0080] The operation and maintenance management channel is used for starting and stopping remote operation and maintenance channels, managing terminal devices, and approving work orders;

[0081] The data acquisition channel is used to acquire operating data of substation secondary equipment according to the IEC 61850 protocol;

[0082] The remote operation and maintenance channel is used to enable remote login and remote operation of the substation monitoring backend;

[0083] The remote operation and maintenance channel is closed by default and is only opened by the operation and maintenance management channel based on a whitelist, password, or public / private key authentication policy after the operation and maintenance work order is approved.

[0084] Specifically, the operation and maintenance method also includes a security encryption step:

[0085] The operation and maintenance management channel uses SM2 and SM4 algorithms for encrypted transmission;

[0086] The remote operation and maintenance channel uses a secure tunnel for encrypted transmission.

[0087] A remote operation and maintenance system for secondary equipment in an intelligent substation includes: intelligent terminals for secondary equipment, an intelligent remote operation platform, and a communication network and security channel;

[0088] The secondary equipment intelligent terminal is deployed in the secondary equipment intelligent terminal of the intelligent substation, and the secondary equipment intelligent terminal is used to collect the operating data of all secondary equipment in the station;

[0089] The intelligent remote operation platform is deployed on the control master station terminal. The intelligent remote operation platform is used to subscribe to the operation data on demand to realize panoramic monitoring and remote operation.

[0090] The communication network and security channel are connected between the master station and the substation.

[0091] Example 2

[0092] like Figure 1 As shown, the overall system architecture includes an intelligent remote operation platform deployed at the control master station and intelligent terminals for secondary equipment deployed at intelligent substations. The master station platform further includes a data server, application server, remote operation and maintenance server, and workstations, forming an integrated remote operation and maintenance system. The substation-side intelligent terminals communicate with all secondary equipment, such as protection devices, measurement and control devices, and remote control devices, through the IEC 61850 protocol, collecting comprehensive data on their operating resources, internal conditions, pressure plate status, and setting information. In practical applications, the system can simultaneously connect to substations of multiple voltage levels, such as 220kV hub stations and 500kV important sites, to achieve centralized management of the regional power grid.

[0093] When implementing panoramic monitoring, the main station platform subscribes to data on demand and displays the real-time operating status of equipment in a hierarchical and scenario-based manner on workstations. Specific examples include: maintenance personnel can drill down from the primary wiring diagram of the power grid to a detailed view of a specific 220kV line protection cabinet, viewing in real time the sampling accuracy of the protection device, GOOSE link status, and the activation / deactivation status of protection function panels. The system uses intelligent analysis algorithms to perform real-time diagnosis and alarms for device timing deviations, communication interruptions, and sampling anomalies, and correlates alarm information with the timing of GOOSE / SV messages from associated IEDs. For example, when an anomaly in the sampling data of a certain bay merging unit is detected, the system automatically retrieves and compares the sampling messages from relevant protection and control devices, assisting maintenance personnel in quickly locating the fault in the merging unit, fiber optic link, or receiving device.

[0094] Example 3

[0095] This embodiment demonstrates an implementation based on SCD automatic configuration and remote modification of fixed values. In terms of specific operational implementation, it combines... Figure 3 and Figure 4 The process shown involves the system first automatically configuring devices via SCD files for rapid connection. After importing the SCD file into the station's intelligent terminal, its built-in parsing module performs syntax checks, model verification, and visual analysis, automatically extracting the dataset, information point table, and setpoint table for MMS communication. For example, when a new station is put into operation, maintenance personnel only need to import the final SCD file, and the system can automatically identify the configuration for the entire station's protection, generating a standardized device information database and communication parameter table, reducing the on-site configuration work that originally required 2-3 days to be completed within 2 hours.

[0096] When performing remote modification of a fixed value, the system provides a complete operational safeguard mechanism;

[0097] Specific example: When changes in the power grid operation mode require adjustments to the distance protection settings of a 500kV line, maintenance personnel initiate a setting modification work order on the main station platform. After online approval by the on-duty dispatcher, the system opens a remote maintenance channel through the security authentication mechanism of the maintenance management channel. The main station first summons and displays the current setting group of the line's protection device through the data acquisition channel. The system automatically performs a standardization check on the setting items and provides a recommended value range. After the maintenance personnel modify the setting, the system requires secondary confirmation, and then the instruction is sent to the station for execution via an SM4-encrypted security tunnel. After the device returns to calibration and passes, the system automatically summons the new setting for verification and records the entire operation process. This standardized process reduces the setting modification time from more than 4 hours in the traditional mode to within 30 minutes, and completely avoids the risk of human error.

[0098] Example 4

[0099] This embodiment demonstrates the emergency operation and safety auditing capabilities of the device of the present invention; the system provides a comprehensive emergency operation solution for power grid emergencies. Specific application scenarios include: when a DC grounding fault occurs in a substation and an emergency circuit needs to be tested, maintenance personnel with emergency authorization can directly log in to the system through a dedicated authentication channel (such as dual-factor authentication using USB-KEY + dynamic password), bypassing lengthy work order approval processes, and immediately perform remote reset operations on the measurement and control devices of the target circuit. During typhoon emergency response, maintenance personnel can remotely activate the automatic backup power supply switching devices for critical lines in batches, greatly improving emergency response efficiency.

[0100] To ensure the safety and controllability of emergency operations, the system employs a multi-layered auditing mechanism. All emergency operations begin with full screen recording upon authorization, capturing all operator commands, screen transitions, and device responses. The system generates an immutable operation log containing digital signatures and timestamps, detailing the operational context. For example, in a real-world busbar fault handling incident, the system fully recorded the entire process from login, viewing fault waveforms, resetting relevant devices, to restoring power, providing comprehensive technical data for subsequent incident analysis and effectively monitoring the standardization of emergency operations.

[0101] Example 5

[0102] This embodiment demonstrates the operational statistics and refined management of the present invention. The system's statistical analysis function provides data support for operation and maintenance management. In actual operation, the system automatically generates multi-dimensional operation and maintenance reports: statistics by operation type show that 156 setting modifications, 89 pressure plate activation / deactivation, and 203 device resets were performed across the company last month, with a setting modification success rate of 98.7%; statistics by site show that the proportion of remote operations at a certain 220kV smart substation has increased to 85% of the total number of operations; statistics by shift show a comparison of the operation efficiency and success rate of each operation and maintenance shift.

[0103] These statistical data are centrally displayed on the main platform through visualization, forming a "digital cockpit" for operation and maintenance management. Specific application examples: A power supply company, by analyzing the monthly reports provided by the system, discovered that the long average time for modifying relay protection settings was mainly due to low efficiency in the on-site verification process. Therefore, they optimized the on-site operation procedures. By comparing the success rates of remote operations at various substations, they found that the communication interruption rate at one station was significantly high. They promptly arranged for the communication equipment to be repaired, eliminating the potential hazard. This data-driven management model significantly improves the targeting and effectiveness of operation and maintenance work.

[0104] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for remote operation and maintenance of secondary equipment in an intelligent substation. Its features are, Includes the following steps: Step S1: Collect the operating data of all secondary equipment in the smart substation through the intelligent terminals of the secondary equipment deployed in the smart substation; Step S2: The intelligent remote operation platform deployed on the control master station subscribes to and receives the operation data as needed, realizing panoramic monitoring and display of the equipment's operating status; Step S3: In response to the remote operation command, after passing the security authentication, a remote operation and maintenance channel is established, and based on the operation data, remote operation is performed on the secondary equipment in the station.

2. The method for remote operation and maintenance of secondary equipment in an intelligent substation according to claim 1. Its features are, In step S1, the collection of operating data of all secondary equipment in the station specifically includes: collecting device parameters, setting information, pressure plate status, internal operating conditions, time synchronization status, operating resources, process resources, fault events and fault files of at least one of the protection devices, measurement and control devices, remote control devices, monitoring host, five-prevention workstation, PMU and switch according to the IEC 61850 protocol.

3. The method for remote operation and maintenance of secondary equipment in an intelligent substation according to claim 1. Its features are, The procedure before step S1 also includes: The intelligent terminal for secondary equipment is automatically configured based on the substation configuration description file to achieve communication access with all secondary equipment in the station. The automatic configuration is based on the SCD file and includes: performing standardization checks and visual analysis on the SCD file, checking the IED connection and GOOSE virtual terminal connection, and extracting the dataset, information point table and fixed value point table for MMS communication.

4. A remote operation and maintenance method for secondary equipment in an intelligent substation according to claim 1. Its features are, The method further includes: The operation results of the remote operation are statistically analyzed, and the operation results include at least the total number and success rate of each of the four operation types: pressure plate operation, set value operation, device reset, and equipment emergency operation.

5. A method for remote operation and maintenance of secondary equipment in an intelligent substation according to claim 1. Its features are, The panoramic monitoring and display in step S2 includes: The real-time operating status of various secondary equipment is displayed in a hierarchical and scenario-based manner, with different levels and grades. Determine if there is any abnormal secondary equipment maintenance information and issue an alarm; Display the GOOSE communication messages, SV sample value messages, and related events between associated IEDs in a chronological manner.

6. A method for remote operation and maintenance of secondary equipment in an intelligent substation according to claim 1. Its features are, In step S3, performing remote operations on the secondary equipment within the station includes at least one of the following operation types: Pressure plate operation: Soft pressure plate of the activation / deactivation protection device or monitoring and control device; Setting operation: Calling or modifying the settings of protection devices, measurement and control devices, or waveform recording devices; Device reset: Remotely reset the device status; Emergency equipment operation: In emergency scenarios, after verifying the dedicated permissions, the operation can be performed without a work order process, and the entire operation process is recorded and audited.

7. A method for remote operation and maintenance of secondary equipment in an intelligent substation according to claim 1. Its features are, In step S3, establishing a remote operation and maintenance channel specifically includes: Three logically independent channels are established between the main station and the substation; The three logically independent channels include: the operation and maintenance management channel, the data acquisition channel, and the remote operation and maintenance channel; The operation and maintenance management channel is used for starting and stopping remote operation and maintenance channels, managing terminal devices, and approving work orders; The data acquisition channel is used to acquire operating data of substation secondary equipment according to the IEC 61850 protocol; The remote operation and maintenance channel is used to enable remote login and remote operation of the substation monitoring backend; The remote operation and maintenance channel is closed by default and is only opened by the operation and maintenance management channel based on a whitelist, password, or public / private key authentication policy after the operation and maintenance work order is approved.

8. A method for remote operation and maintenance of secondary equipment in an intelligent substation according to claim 7. Its features are, The operation and maintenance method also includes a security encryption step: The operation and maintenance management channel uses SM2 and SM4 algorithms for encrypted transmission; The remote operation and maintenance channel uses a secure tunnel for encrypted transmission.

9. A remote operation and maintenance system for secondary equipment in an intelligent substation. This method is used to implement a remote operation and maintenance method for secondary equipment in an intelligent substation as described in any one of claims 1 to 8. Its features are, This includes: intelligent terminals for secondary equipment, intelligent remote operation platforms, and communication networks and security channels; The secondary equipment intelligent terminal is deployed in the secondary equipment intelligent terminal of the intelligent substation, and the secondary equipment intelligent terminal is used to collect the operating data of all secondary equipment in the station; The intelligent remote operation platform is deployed on the control master station terminal. The intelligent remote operation platform is used to subscribe to the operation data on demand to realize panoramic monitoring and remote operation. The communication network and security channel are connected between the master station and the substation.

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