Phase standby system of gas-insulated metal-enclosed power transmission line

Abstract

The invention relates to a phase standby system of a gas-insulated metal-enclosed power transmission line. The phase standby system comprises a gas-insulated metal-enclosed power transmission line main loop and a phase standby loop, and the phase standby loop is used for replacing the faulted phase loop in the main loop through switching of a circuit breaker when the phase loop in the main loop breaks down. According to the technical scheme, the phase standby loop is arranged and used for replacing the faulted phase loop in the main loop when the phase loop in the main loop breaks down, switching can be achieved through operation of some circuit breakers, and the labor cost and the time cost are reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of electric power technology, and in particular to a phase backup system for a gas-insulated metal-enclosed transmission line. Background Art

[0002] In related technologies, the spare phase of the Gas-Insulated Metal-Enclosed Transmission Line (GIL) is used to deal with possible faults and provide additional protection for the system. After a fault occurs in any phase of the main circuit, the spare phase is put into use by spatially unplugging the wires and adding connecting wires to ensure the stable operation of the system. On-site operation and maintenance personnel are required to unplug the wires and add connecting wires after the fault occurs. The workload of on-site operation and maintenance is large, and removing the wires and adding connecting wires requires high-altitude operations, which wastes a lot of manpower and time costs. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention provides a phase backup system for a gas-insulated metal-enclosed transmission line to solve the problems of high labor and time costs.

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a phase backup system for a gas-insulated metal-enclosed transmission line, comprising:

[0005] Main circuits and phase standby circuits of gas-insulated metal-enclosed transmission lines;

[0006] The phase backup circuit is used to replace the faulty phase circuit in the main circuit by switching the circuit breaker when a phase circuit in the main circuit fails.

[0007] In one embodiment, the first output end of the standby phase circuit is connected to the first end of the A-phase standby first circuit breaker and the first end of the A-phase standby second circuit breaker respectively;

[0008] The second end of the A-phase standby first circuit breaker is connected to the A-phase first busbar;

[0009] The second end of the A-phase standby second circuit breaker is connected to the A-phase second busbar;

[0010] The A-phase first standby circuit breaker and the A-phase second standby circuit breaker are connected in series;

[0011] The second output end of the standby phase circuit is connected to the first end of the B-phase standby first circuit breaker and the first end of the B-phase standby second circuit breaker respectively;

[0012] The second end of the B-phase standby first circuit breaker is connected to the B-phase first busbar;

[0013] The second end of the B-phase standby second circuit breaker is connected to the B-phase second busbar;

[0014] The B-phase first circuit breaker and the B-phase second circuit breaker are connected in series;

[0015] The second output end of the standby phase circuit is connected to the first end of the C-phase standby first circuit breaker and the first end of the C-phase standby second circuit breaker respectively;

[0016] The second end of the C-phase standby first circuit breaker is connected to the C-phase first busbar;

[0017] The second end of the C-phase standby second circuit breaker is connected to the C-phase second busbar;

[0018] The C-phase first standby circuit breaker and the C-phase second standby circuit breaker are connected in series;

[0019] Isolating switch; the input end of the isolating switch is connected to a three-phase power supply, and the output end is connected to the A-phase action protection circuit, the B-phase action protection circuit and the C-phase action protection circuit respectively;

[0020] The A-phase action protection circuit includes: an A-phase double busbar and three A-phase circuit breakers connected in series;

[0021] The B-phase action protection circuit includes: a B-phase double busbar and three B-phase circuit breakers connected in series;

[0022] The C-phase action protection circuit includes: a C-phase double busbar and three C-phase circuit breakers connected in series;

[0023] The first end of the first circuit breaker of phase A is connected to the first busbar of phase A;

[0024] The second end of the A-phase first circuit breaker and the first end of the A-phase second circuit breaker are respectively connected to the A-phase output end of the disconnector;

[0025] The second end of the second A-phase circuit breaker and the first end of the third A-phase circuit breaker are connected to the A-phase power supply;

[0026] The second end of the A-phase third circuit breaker is connected to the A-phase second busbar;

[0027] The first end of the B-phase first circuit breaker is connected to the B-phase first busbar;

[0028] The second end of the B-phase first circuit breaker and the first end of the B-phase second circuit breaker are respectively connected to the B-phase output end of the disconnector;

[0029] The second end of the B-phase second circuit breaker and the first end of the B-phase third circuit breaker are connected to the B-phase power supply;

[0030] The second end of the B-phase third circuit breaker is connected to the B-phase second busbar;

[0031] The first end of the C-phase first circuit breaker is connected to the C-phase first busbar;

[0032] The second end of the C-phase first circuit breaker and the first end of the C-phase second circuit breaker are respectively connected to the C-phase output end of the disconnector;

[0033] The second end of the C-phase second circuit breaker and the first end of the C-phase third circuit breaker are connected to the C-phase power supply;

[0034] The second end of the C-phase third circuit breaker is connected to the C-phase second busbar.

[0035] In one embodiment, when a phase A fault occurs, the phase A first circuit breaker and the phase A second circuit breaker in the phase A action protection circuit are disconnected;

[0036] The isolating switch switches from a closed state to an open state;

[0037] The A-phase standby first circuit breaker and the A-phase standby second circuit breaker are switched from an open state to a closed state, so that the standby A-phase busbar enters a use state.

[0038] In one embodiment, when a phase B fault occurs, the phase B first circuit breaker and the phase B second circuit breaker in the phase B action protection circuit are disconnected;

[0039] The isolating switch switches from a closed state to an open state;

[0040] The B-phase standby first circuit breaker and the B-phase standby second circuit breaker are switched from an open state to a closed state, so that the standby B-phase busbar enters a use state.

[0041] In one embodiment, when a C-phase fault occurs, the C-phase first circuit breaker and the C-phase second circuit breaker in the C-phase action protection circuit are disconnected;

[0042] The isolating switch switches from a closed state to an open state;

[0043] The C-phase backup first circuit breaker and the C-phase backup second circuit breaker are switched from an open state to a closed state, so that the backup C-phase busbar enters a use state.

[0044] In one embodiment, when the phase A fault is eliminated, the phase A backup first circuit breaker and the phase A backup second circuit breaker are switched from a closed state to an open state to cut off the backup phase A busbar;

[0045] The A-phase first circuit breaker and the A-phase second circuit breaker in the A-phase action protection circuit are closed;

[0046] The disconnector switches from the open state to the closed state.

[0047] In one embodiment, when the B-phase fault is eliminated, the B-phase backup first circuit breaker and the B-phase backup second circuit breaker are switched from a closed state to an open state to cut off the backup B-phase busbar;

[0048] The B-phase first circuit breaker and the B-phase second circuit breaker in the B-phase action protection circuit are closed;

[0049] The disconnector switches from the open state to the closed state.

[0050] In one embodiment, when the C-phase fault is eliminated, the C-phase backup first circuit breaker and the C-phase backup second circuit breaker are switched from a closed state to an open state to cut off the backup C-phase busbar;

[0051] The C-phase first circuit breaker and the C-phase second circuit breaker in the C-phase action protection circuit are closed;

[0052] The disconnector switches from the open state to the closed state.

[0053] In one embodiment, it also includes a controller, which is respectively connected to the A-phase standby first circuit breaker, the A-phase standby second circuit breaker, the B-phase standby first circuit breaker, the B-phase standby second circuit breaker, the C-phase standby first circuit breaker, the C-phase standby second circuit breaker, the A-phase first circuit breaker, the A-phase second circuit breaker, the A-phase third circuit breaker, the B-phase first circuit breaker, the B-phase second circuit breaker, the B-phase third circuit breaker, the C-phase first circuit breaker, the C-phase second circuit breaker and the C-phase third circuit breaker.

[0054] In one embodiment, the controller controls the on and off of any one of the circuit breakers based on a pre-trained decision tree model.

[0055] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0056] The technical solution of the present application sets up a phase backup circuit, which is used to replace the faulty phase circuit in the main circuit when a phase circuit in the main circuit fails. Switching can be achieved through the operation of some circuit breakers, reducing labor costs and time costs.

[0057] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0059] Figure 1 A phase backup system for a gas-insulated metal-enclosed transmission line is shown according to an exemplary embodiment;

[0060] Figure 2 FIG. 1 is a schematic diagram showing a six-phase to four-phase conversion according to an exemplary embodiment. DETAILED DESCRIPTION

[0061] The present invention will be further described below with reference to the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application.

[0062] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0063] It should be noted that all actions of acquiring signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0064] Based on this, the present application proposes a phase backup system for gas-insulated metal-enclosed transmission lines, see the attached Figure 1 , the phase backup system of the gas-insulated metal-enclosed transmission line includes:

[0065] Main circuit and phase standby circuit of gas-insulated metal-enclosed transmission line.

[0066] The phase backup circuit is used to replace the faulty phase circuit in the main circuit by switching the circuit breaker when a phase circuit in the main circuit fails.

[0067] The technical solution of the present application sets up a phase backup circuit, which is used to replace the faulty phase circuit in the main circuit when a phase circuit in the main circuit fails. Switching can be achieved through the operation of some circuit breakers, reducing labor costs and time costs.

[0068] In some embodiments, see Appendix Figure 1 The rectangular box in the figure represents a circuit breaker. The first output end of the standby phase circuit is connected to the first end of the A-phase standby first circuit breaker and the first end of the A-phase standby second circuit breaker respectively.

[0069] The second end of the A-phase standby first circuit breaker is connected to the A-phase first busbar.

[0070] The second end of the A-phase standby second circuit breaker is connected to the A-phase second busbar.

[0071] The A-phase first backup circuit breaker and the A-phase second backup circuit breaker are connected in series.

[0072] The second output end of the standby phase loop is connected to the first end of the B-phase standby first circuit breaker and the first end of the B-phase standby second circuit breaker respectively.

[0073] The second end of the B-phase standby first circuit breaker is connected to the B-phase first busbar.

[0074] The second end of the B-phase standby second circuit breaker is connected to the B-phase second busbar.

[0075] The B-phase first circuit breaker and the B-phase second circuit breaker are connected in series.

[0076] The second output end of the standby phase loop is connected to the first end of the C-phase standby first circuit breaker and the first end of the C-phase standby second circuit breaker respectively.

[0077] The second end of the C-phase standby first circuit breaker is connected to the C-phase first busbar.

[0078] The second end of the C-phase standby second circuit breaker is connected to the C-phase second busbar.

[0079] The C-phase first backup circuit breaker and the C-phase second backup circuit breaker are connected in series.

[0080] The isolating switch has an input end connected to a three-phase power supply, and an output end connected to a phase A action protection circuit, a phase B action protection circuit, and a phase C action protection circuit.

[0081] The A-phase action protection circuit includes: an A-phase double busbar and three A-phase circuit breakers connected in series.

[0082] The B-phase action protection circuit includes: a B-phase double busbar and three B-phase circuit breakers connected in series.

[0083] The C-phase action protection circuit includes: a C-phase double busbar and three C-phase circuit breakers connected in series.

[0084] The first end of the A-phase first circuit breaker is connected to the A-phase first busbar.

[0085] The second end of the A-phase first circuit breaker and the first end of the A-phase second circuit breaker are respectively connected to the A-phase output end of the disconnector.

[0086] The second end of the second A-phase circuit breaker and the first end of the third A-phase circuit breaker are connected to the A-phase power supply;

[0087] The second end of the A-phase third circuit breaker is connected to the A-phase second busbar.

[0088] The first end of the B-phase first circuit breaker is connected to the B-phase first busbar.

[0089] The second end of the B-phase first circuit breaker and the first end of the B-phase second circuit breaker are respectively connected to the B-phase output end of the disconnector.

[0090] The second end of the B-phase second circuit breaker and the first end of the B-phase third circuit breaker are connected to the B-phase power supply.

[0091] The second end of the B-phase third circuit breaker is connected to the B-phase second busbar.

[0092] The first end of the C-phase first circuit breaker is connected to the C-phase first busbar.

[0093] The second end of the C-phase first circuit breaker and the first end of the C-phase second circuit breaker are respectively connected to the C-phase output end of the disconnector.

[0094] The second end of the C-phase second circuit breaker and the first end of the C-phase third circuit breaker are connected to the C-phase power supply.

[0095] The second end of the C-phase third circuit breaker is connected to the C-phase second busbar.

[0096] In some embodiments, when a phase A fault occurs, the phase A first circuit breaker and the phase A second circuit breaker in the phase A protection circuit are disconnected.

[0097] The disconnector switches from the closed state to the open state.

[0098] The A-phase standby first circuit breaker and the A-phase standby second circuit breaker are switched from an open state to a closed state, so that the standby A-phase busbar enters a use state.

[0099] The time from fault removal to the switching on of the backup phase is completed within 200ms, which is much shorter than the 900ms time required for single-phase reclosing.

[0100] In some embodiments, when a B-phase fault occurs, the B-phase first circuit breaker and the B-phase second circuit breaker in the B-phase action protection circuit are disconnected.

[0101] The disconnector switches from the closed state to the open state.

[0102] The B-phase standby first circuit breaker and the B-phase standby second circuit breaker are switched from an open state to a closed state, so that the standby B-phase busbar enters a use state.

[0103] In some embodiments, when a C-phase fault occurs, the C-phase first circuit breaker and the C-phase second circuit breaker in the C-phase action protection circuit are disconnected.

[0104] The disconnector switches from the closed state to the open state.

[0105] The C-phase backup first circuit breaker and the C-phase backup second circuit breaker are switched from an open state to a closed state, so that the backup C-phase busbar enters a use state.

[0106] In some embodiments, when the phase A fault is eliminated, the phase A backup first circuit breaker and the phase A backup second circuit breaker are switched from a closed state to an open state to cut off the backup phase A bus;

[0107] The A-phase first circuit breaker and the A-phase second circuit breaker in the A-phase action protection circuit are closed.

[0108] The disconnector switches from the open state to the closed state.

[0109] In some embodiments, when the B-phase fault is eliminated, the B-phase backup first circuit breaker and the B-phase backup second circuit breaker are switched from a closed state to an open state to cut off the backup B-phase bus.

[0110] The B-phase first circuit breaker and the B-phase second circuit breaker in the B-phase action protection circuit are closed;

[0111] The disconnector switches from the open state to the closed state.

[0112] In some embodiments, when the C-phase fault is eliminated, the C-phase backup first circuit breaker and the C-phase backup second circuit breaker are switched from a closed state to an open state to cut off the backup C-phase bus.

[0113] The C-phase first circuit breaker and the C-phase second circuit breaker in the C-phase action protection circuit are closed;

[0114] The disconnector switches from the open state to the closed state.

[0115] In some embodiments, a controller is also included, which is respectively connected to the A-phase standby first circuit breaker, the A-phase standby second circuit breaker, the B-phase standby first circuit breaker, the B-phase standby second circuit breaker, the C-phase standby first circuit breaker, the C-phase standby second circuit breaker, the A-phase first circuit breaker, the A-phase second circuit breaker, the A-phase third circuit breaker, the B-phase first circuit breaker, the B-phase second circuit breaker, the B-phase third circuit breaker, the C-phase first circuit breaker, the C-phase second circuit breaker and the C-phase third circuit breaker.

[0116] In some embodiments, the controller controls any one of the above-mentioned circuit breakers and the on and off of the disconnecting switch based on a pre-trained decision tree model.

[0117] In this embodiment, the following is an embodiment based on machine learning (taking a decision tree model as an example) to allow the controller to control the on and off of the switch according to the phase loop conditions, so that the switch is closed when it should be closed and opened when it should be opened.

[0118] A voltage sensor, a current sensor, and a sensor for detecting the switch status (closed or open) are installed in each phase circuit. Voltage (V), current (I), and actual switch status information are collected in real time, with a sampling frequency of five times per second.

[0119] The collected voltage and current data, along with the actual switch status and timestamp, is stored in a database for a predetermined period of time, such as a year or a month. The correct switch status (determined according to the circuit's normal operating logic and design requirements) is also manually annotated in the historical data.

[0120] Calculate some derived features related to the switch state, such as the average voltage, average current, and voltage and current fluctuation range over a period of time (such as 1 minute).

[0121] Normalize numerical data such as voltage and current and map them to the range [0, 1]. For switch state data, "closed" is represented by 1 and "open" is represented by 0.

[0122] Use a tool or platform that can build and train decision tree models.

[0123] The preprocessed data is divided into a training set (accounting for 70%) and a test set (accounting for 30%).

[0124] The decision tree model is trained using the training set data to allow the model to learn the relationship between voltage, current, derived features, etc. and the correct state of the switch.

[0125] Use the test set to evaluate the trained model and calculate metrics such as accuracy and recall to ensure that the model can accurately predict the correct switch state. If the model performance does not meet the requirements, adjust the model parameters or re-perform data preprocessing.

[0126] The controller obtains the voltage and current data collected by the phase circuit sensors and the actual status information of the switch in real time through the communication interface, and calculates the derived features and performs normalization according to the method of the preprocessing stage.

[0127] The real-time processed data is input into the trained decision tree model to obtain the predicted correct switch state.

[0128] The predicted switch state is compared with the actual state of the current switch.

[0129] If the predicted state is closed and the actual state is open, the controller sends a closing command to the corresponding switch.

[0130] If the predicted state is open and the actual state is closed, the controller sends an opening command to the corresponding switch.

[0131] The controller records each decision-making process, real-time data, and switch actions. This information can be used to optimize and update the model later. It also provides feedback to operators via the display or communication interface, facilitating system monitoring and maintenance.

[0132] Through the above embodiments, the controller can use the decision tree model trained based on historical data to predict the correct state of the switch according to the real-time situation of the phase loop, and promptly control the switch to perform corresponding on-off operations.

[0133] The technical solution of this application has the following potential applications: 1) Long-distance GIL transmission scenarios, crossing mountains, rivers, lakes, and other areas. These projects require huge investment per project, and adjusting the number of GIL circuits has a significant impact on project investment; 2) Urban power supply, which has a large number of such projects and great potential. It is worth noting that since GIL is mixed with overhead lines, the overhead lines are prone to two-phase faults and three-phase grounding. Therefore, this solution is not suitable for scenarios where GIL is mixed with overhead lines.

[0134] See attached Figure 2 , technical and economic analysis, taking the original 500kV solution using two 4000A GIL pipelines (6 phases) as an example, after adopting the hot standby topology proposed by this invention, the substations on both sides adopt Figure 2 The GIL is optimized to a four-phase wiring pattern. This increases substation investment by 5 million RMB on both sides, saves 20 million RMB per km for GIL equipment, and approximately 40 million RMB per km for tunneling. For example, using a 10 km GIL, this solution can save approximately 600 million RMB in project investment.

[0135] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0136] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A phase backup system for a gas-insulated metal-enclosed transmission line, characterized in that: include: Main circuits and phase standby circuits of gas-insulated metal-enclosed transmission lines; The phase backup circuit is used to replace the faulty phase circuit in the main circuit by switching the circuit breaker when a phase circuit in the main circuit fails.

2. The phase backup system for a gas-insulated metal-enclosed transmission line according to claim 1, characterized in that: The first output end of the standby phase circuit is connected to the first end of the A-phase standby first circuit breaker and the first end of the A-phase standby second circuit breaker respectively; The second end of the A-phase standby first circuit breaker is connected to the A-phase first busbar; The second end of the A-phase standby second circuit breaker is connected to the A-phase second busbar; The A-phase first standby circuit breaker and the A-phase second standby circuit breaker are connected in series; The second output end of the standby phase circuit is connected to the first end of the B-phase standby first circuit breaker and the first end of the B-phase standby second circuit breaker respectively; The second end of the B-phase standby first circuit breaker is connected to the B-phase first busbar; The second end of the B-phase standby second circuit breaker is connected to the B-phase second busbar; The B-phase first circuit breaker and the B-phase second circuit breaker are connected in series; The second output end of the standby phase circuit is connected to the first end of the C-phase standby first circuit breaker and the first end of the C-phase standby second circuit breaker respectively; The second end of the C-phase standby first circuit breaker is connected to the C-phase first busbar; The second end of the C-phase standby second circuit breaker is connected to the C-phase second busbar; The C-phase first standby circuit breaker and the C-phase second standby circuit breaker are connected in series; Isolating switches; The input end of the isolating switch is connected to a three-phase power supply, and the output end is connected to an A-phase action protection circuit, a B-phase action protection circuit, and a C-phase action protection circuit respectively; The A-phase action protection circuit includes: an A-phase double busbar and three A-phase circuit breakers connected in series; The B-phase action protection circuit includes: a B-phase double busbar and three B-phase circuit breakers connected in series; The C-phase action protection circuit includes: a C-phase double busbar and three C-phase circuit breakers connected in series; The first end of the first circuit breaker of phase A is connected to the first busbar of phase A; The second end of the A-phase first circuit breaker and the first end of the A-phase second circuit breaker are respectively connected to the A-phase output end of the disconnector; The second end of the second A-phase circuit breaker and the first end of the third A-phase circuit breaker are connected to the A-phase power supply; The second end of the A-phase third circuit breaker is connected to the A-phase second busbar; The first end of the B-phase first circuit breaker is connected to the B-phase first busbar; The second end of the B-phase first circuit breaker and the first end of the B-phase second circuit breaker are respectively connected to the B-phase output end of the disconnector; The second end of the B-phase second circuit breaker and the first end of the B-phase third circuit breaker are connected to the B-phase power supply; The second end of the B-phase third circuit breaker is connected to the B-phase second busbar; The first end of the C-phase first circuit breaker is connected to the C-phase first busbar; The second end of the C-phase first circuit breaker and the first end of the C-phase second circuit breaker are respectively connected to the C-phase output end of the disconnector; The second end of the C-phase second circuit breaker and the first end of the C-phase third circuit breaker are connected to the C-phase power supply; The second end of the C-phase third circuit breaker is connected to the C-phase second busbar.

3. The phase backup system for a gas-insulated metal-enclosed transmission line according to claim 2, characterized in that: When a phase A fault occurs, the phase A first circuit breaker and the phase A second circuit breaker in the phase A action protection circuit are disconnected; The isolating switch switches from a closed state to an open state; The A-phase standby first circuit breaker and the A-phase standby second circuit breaker are switched from an open state to a closed state, so that the standby A-phase busbar enters a use state.

4. The phase backup system for a gas-insulated metal-enclosed transmission line according to claim 2, characterized in that: When a phase B fault occurs, the phase B first circuit breaker and the phase B second circuit breaker in the phase B action protection circuit are disconnected; The isolating switch switches from a closed state to an open state; The B-phase standby first circuit breaker and the B-phase standby second circuit breaker are switched from an open state to a closed state, so that the standby B-phase busbar enters a use state.

5. The phase backup system for a gas-insulated metal-enclosed transmission line according to claim 2, characterized in that: When a C-phase fault occurs, the C-phase first circuit breaker and the C-phase second circuit breaker in the C-phase action protection circuit are disconnected; The isolating switch switches from a closed state to an open state; The C-phase backup first circuit breaker and the C-phase backup second circuit breaker are switched from an open state to a closed state, so that the backup C-phase busbar enters a use state.

6. The phase backup system for a gas-insulated metal-enclosed transmission line according to claim 3, characterized in that: When the A-phase fault is eliminated, the A-phase standby first circuit breaker and the A-phase standby second circuit breaker are switched from the open closed state to the open state to cut off the standby A-phase busbar; The A-phase first circuit breaker and the A-phase second circuit breaker in the A-phase action protection circuit are closed; The disconnector switches from the open state to the closed state.

7. The phase backup system for a gas-insulated metal-enclosed transmission line according to claim 4, characterized in that: When the B-phase fault is eliminated, the B-phase standby first circuit breaker and the B-phase standby second circuit breaker are switched from the open closed state to the open state to cut off the standby B-phase busbar; The B-phase first circuit breaker and the B-phase second circuit breaker in the B-phase action protection circuit are closed; The disconnector switches from the open state to the closed state.

8. The phase backup system for a gas-insulated metal-enclosed transmission line according to claim 5, characterized in that: When the C-phase fault is eliminated, the C-phase standby first circuit breaker and the C-phase standby second circuit breaker are switched from the open state to the open state to cut off the standby C-phase busbar; The C-phase first circuit breaker and the C-phase second circuit breaker in the C-phase action protection circuit are closed; The disconnector switches from the open state to the closed state.

9. The phase backup system for a gas-insulated metal-enclosed transmission line according to claim 2, characterized in that: It also includes a controller, which is respectively connected to the A-phase standby first circuit breaker, the A-phase standby second circuit breaker, the B-phase standby first circuit breaker, the B-phase standby second circuit breaker, the C-phase standby first circuit breaker, the C-phase standby second circuit breaker, the A-phase first circuit breaker, the A-phase second circuit breaker, the A-phase third circuit breaker, the B-phase first circuit breaker, the B-phase second circuit breaker, the B-phase third circuit breaker, the C-phase first circuit breaker, the C-phase second circuit breaker and the C-phase third circuit breaker.

10. The phase backup system for a gas-insulated metal-enclosed transmission line according to claim 9, characterized in that: The controller controls the on and off of any one of the above circuit breakers based on a pre-trained decision tree model.

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