A method and system for non-stop maintenance of main power lines using a bypass shelter

Abstract

The present invention relates to a method and system for non-stop maintenance of a main power line using a bypass cabin, comprising: S1, preparing a bypass cabin, connecting a bypass cable of the bypass cabin to the main power line, wherein: the main power line carries a first load and the bypass cable is in a standby state; S2, preparing the bypass cable to carry a second load that is the same as the first load; S3, taking a portion of the first load from the main power line and loading it onto the bypass cable, and synchronously reducing the second load according to the increased load on the bypass cable, so that the total load carried by the bypass cable remains unchanged; S4, until the first load is completely loaded from the main power line onto the bypass cable, the second load carried by the bypass cable is zero, thereby realizing load switching between the bypass cable and the main power line. During the load switching process, the present invention ensures the stability and safety of load transfer, can prevent the occurrence of sudden changes, and avoids damage to electrical equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of bypass shelters, and in particular to a method and system for performing non-stop maintenance on a main power line by utilizing a bypass shelter. Background Art

[0002] A bypass shelter is a specially designed mobile integrated service facility, mainly used for live operations in power systems. It integrates multiple functions such as electric deployment and storage of bypass cables, real-time current monitoring of the bypass system, temperature monitoring of the bypass system connections, and insulation resistance monitoring of the bypass system.

[0003] Existing bypass shelters are mainly used for non-stop maintenance of power lines to ensure the continuity and stability of power supply. Without power outages, a temporary bypass circuit is built to isolate the part that needs maintenance from the main power grid, thereby enabling maintenance or replacement of equipment without affecting the power supply to users.

[0004] For example, the Chinese invention patent publication number CN113346409A, entitled "Method for Load Transfer and Maintenance without Power Outages in 10kV Outgoing Line Intervals of Substations," discloses a method for load transfer using a bypass cable, enabling maintenance of main power lines without power outages. However, when switching between the bypass cable and the main power line cable, this prior art only considers whether the bypass cable's allowable load and current meet the requirements, and only switches if they do.

[0005] In the actual process of circuit load switching, even if the load and current allowed to be carried by the bypass cable meet the requirements, there will still be sudden changes during the switching process, which can easily cause circuit instability and thus damage the electrical equipment. Summary of the Invention

[0006] To this end, the technical problem to be solved by the present invention is to overcome the problem in the prior art that when a bypass cabin is used to connect to the main power line to achieve load switching, sudden changes are prone to occur, resulting in circuit instability. A method and system for non-stop maintenance of the main power line using a bypass cabin are provided, which can switch the load on the main power line to the bypass cable of the bypass cabin. Through the use of the bypass cabin, the main power line can be repaired without affecting the normal power consumption of the user. In addition, during the load switching process, the stability and safety of the load transfer are ensured, and the occurrence of sudden changes can be prevented, thereby avoiding damage to electrical equipment.

[0007] To solve the above technical problems, the present invention provides a method for performing non-stop maintenance on a main power line using a bypass shelter, comprising:

[0008] S1. Prepare a bypass shelter and connect the bypass cable of the bypass shelter to the main power line, wherein: the main power line carries the first load and the bypass cable is in a standby state;

[0009] S2. Prepare a bypass cable to carry a second load that is the same as the first load;

[0010] S3. Load part of the first load from the main power line onto the bypass cable, and according to the increased load on the bypass cable, simultaneously reduce the second load so that the total load carried by the bypass cable remains unchanged;

[0011] S4, until the first load is completely loaded from the main power line to the bypass cable, and the second load carried by the bypass cable is zero, load switching between the bypass cable and the main power line is achieved;

[0012] S5. After the bypass cable and the main power line are switched, the main power line is isolated and the isolated part of the main power line is inspected or replaced.

[0013] In one embodiment of the present invention, in step S2, configuring the bypass cable to carry a second load that is the same as the first load includes:

[0014] Use a step-by-step load increase method, starting from zero and gradually increasing the load;

[0015] During the load increase process, the electrical parameters of the bypass cable are monitored, including current, voltage, frequency and temperature;

[0016] Construct a load change model by using a reinforcement learning network. Based on the historical data of load transfer, the load transfer speed is used as the input parameter and the stability change of the electrical parameters is used as the output parameter to train the load change model.

[0017] With the goal of transferring load as quickly as possible, the speed of load transfer is continuously adjusted, the variables of the load change model are optimized, and the optimal load increase strategy is solved within the constraints.

[0018] In one embodiment of the present invention, in step S2, after the bypass cable is configured to carry a second load that is the same as the first load, electrical parameters on the bypass cable and the main power line are monitored and compared, wherein the electrical parameters include current, voltage, frequency, and temperature. The electrical parameters are monitored and compared until the electrical parameters of the bypass cable and the main power line are consistent, and then step S3 is executed.

[0019] In one embodiment of the present invention, loading a portion of the first load from the main power line to the bypass cable includes:

[0020] Obtain real-time power system parameter information, including real-time data on current, voltage, frequency and temperature of bypass cables and main power lines;

[0021] Set load adjustment thresholds to establish upper and lower limits for load migration;

[0022] Input the acquired electrical system parameter information and the set load adjustment threshold into the algorithm model to calculate the load required to be transferred from the main power line to the bypass cable;

[0023] Based on the load migration requirements output by the algorithm model, the load on the main power line is gradually adjusted, while the load on the bypass cable is increased;

[0024] Continuously monitor the load on the bypass cables and main power lines to ensure that the total load is maintained at the set value and dynamically adjust it based on real-time data.

[0025] In one embodiment of the present invention, when setting the load adjustment threshold, it is determined that the upper threshold limit of each load adjustment does not exceed 10% of the total load.

[0026] In one embodiment of the present invention, in step S3, according to the increased load on the bypass cable, the second load is synchronously reduced so that the total load carried by the bypass cable remains unchanged, and the PID controller is used to adjust the second load, including:

[0027] Obtaining the increased load on the bypass cable and the total load carried by the bypass cable to calculate a second load change;

[0028] Obtaining real-time second load change;

[0029] An error is calculated according to the second load variation obtained in real time and the calculated second load variation, and the second load variation is readjusted until the second load variation obtained in real time and the calculated second load variation are zero.

[0030] In one embodiment of the present invention, in step S3, while a portion of the first load is loaded from the main power line onto the bypass cable, and the second load is synchronously reduced according to the increased load on the bypass cable so that the total load carried by the bypass cable remains unchanged, the state of the bypass cable is monitored, including:

[0031] Monitor current and voltage: Use ammeters and voltmeters to monitor the current and voltage changes of the bypass cable and main power line in real time to ensure smooth transition of current and voltage without sudden changes;

[0032] Temperature monitoring: Use a temperature sensor to monitor the temperature of the bypass cable connection point to ensure that the temperature does not exceed the safe range;

[0033] Monitor insulation resistance: Use an insulation resistance tester to monitor the insulation resistance of the bypass cable to ensure good insulation performance.

[0034] In one embodiment of the present invention, it further comprises:

[0035] S6-1. After the main power line is overhauled, configure the main power line to carry a third load that is the same as the first load;

[0036] S6-2. Load a portion of the first load from the bypass cable onto the main power line. Based on the increased load on the main power line, reduce the third load simultaneously, so that the total load on the main power line remains unchanged.

[0037] S6-3, until the first load is completely loaded from the bypass cable to the main power line, and the third load carried by the main power line is zero, load switching between the main power line and the bypass cable is achieved.

[0038] In order to solve the above technical problems, the present invention also provides a system for performing non-stop maintenance on the main power line using a bypass shelter, comprising:

[0039] A bypass cabin, wherein a bypass cable is provided in the bypass cabin and the bypass cable can be connected to the main power line;

[0040] a first load monitoring unit capable of monitoring electrical parameters of a first load on the main power line, including current, voltage, frequency, and temperature;

[0041] a first load distribution unit capable of distributing a first load between the main power line and the bypass cable;

[0042] a second load applying unit capable of configuring the bypass cable to carry a second load that is the same as the first load;

[0043] a second load monitoring unit capable of monitoring electrical parameters of the second load on the bypass cable, including current, voltage, frequency and temperature;

[0044] The second load regulating unit reduces the second load synchronously according to the increased load on the bypass cable, so that the total amount of load carried by the bypass cable remains unchanged.

[0045] The above technical solution of the present invention has the following advantages over the prior art:

[0046] The present invention discloses a method and system for performing non-stop maintenance on a main power line by utilizing a bypass cabin. Before executing load switching, a bypass cable in the bypass cabin is pre-loaded so that the second load first loaded on the bypass cable is the same as the first load on the main power line, and can achieve the same usage state. Then the load is switched. In this way, it can be ensured that after the bypass cable is connected, the load can be the same as the original main power line, and the same power transmission state as the main power line can be achieved.

[0047] Moreover, when performing load switching, compared to the prior art of directly loading all loads onto the bypass cable, the present invention, when performing switching, since the bypass cable is loaded with a second load, adopts a gradual loading method when switching the first load to the bypass cable, and then reduces the second load synchronously according to the increased load on the bypass cable, so that the total load carried by the bypass cable remains unchanged. This ensures that the bypass cable always operates under the first load state, ensures that the power output state of the bypass cable remains unchanged, prevents sudden load changes during circuit switching, and ensures a stable and safe power transmission state until the first load is fully loaded onto the bypass cable, thereby achieving seamless load switching. At this time, the main power line can be used as a backup line for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0049] Figure 1 This is a flowchart of the steps of the method for non-stop maintenance of the main power line using the bypass shelter of the present invention;

[0050] Figure 2 It is a structural schematic diagram of the bypass shelter of the present invention;

[0051] Explanation of the reference numerals in the specification: 1. Mounting frame; 2. Cable reel; 3. ATS cabinet; 4. Universal wheel; 5. Insulating cross arm. DETAILED DESCRIPTION

[0052] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0053] As previously mentioned, during actual circuit switching, even if the load and current allowed by the bypass cable used in the prior art meet the requirements, sudden changes may still occur during the switching process. Such sudden changes can easily cause circuit instability and damage electrical equipment. The inventors of this application have studied sudden changes and concluded that they are mainly caused by the following two reasons:

[0054] 1. Although the bypass cable can carry the same load as the main power line, the temperature of the bypass cable when it is not in use will be very different from the temperature when it is loaded, which will affect its transmission status to a certain extent.

[0055] 2. Before switching, the bypass cable is in a zero-load state. If the load is switched directly, the load will increase from zero to full load in an instant. Even if the load-bearing capacity of the bypass cable can meet the requirements, it is easy to cause fluctuations in the transmission performance of the bypass cable, and may even cause the bypass cable to break down. Example 1

[0056] Based on the above analysis, in order to solve the above two problems, the present invention provides a method for non-stop maintenance of the main power line using a bypass shelter, referring to Figure 1 As shown, the following steps are included:

[0057] S1. Prepare a bypass shelter and connect the bypass cable of the bypass shelter to the main power line, wherein: the main power line carries the first load and the bypass cable is in a standby state;

[0058] It should be noted that the bypass cable is disconnected at this time by the controller or switch. At this time, the first load in the circuit is all loads, which are all loaded into the main power line, and the main power line is in a working state.

[0059] Specifically, when setting up the connection between the bypass cable and the main power line, it is necessary to ensure that all connection points of the bypass cable are correctly and firmly connected and have good insulation performance; ensure that all monitoring equipment (such as ammeters, temperature sensors, insulation resistance testers, etc.) are ready and can monitor the status of the bypass cable in real time.

[0060] S2. Prepare a bypass cable to carry a second load that is the same as the first load;

[0061] As described in the above analysis, the first reason for the sudden change of the bypass cable is that the temperature of the bypass cable when it is not in use is very different from the temperature when it is loaded, which will cause its transmission state to be affected to a certain extent. In the present invention, in order to solve this problem, before performing load switching, the bypass cable in the bypass cabin is pre-loaded so that the second load loaded on the bypass cable is the same as the first load on the main power line, and can achieve the same usage state. Then the load is switched. In this way, it can be ensured that after the bypass cable is connected, it can be the same as the original main power line load and achieve the same power transmission state as the main power line.

[0062] S3. Load part of the first load from the main power line onto the bypass cable, and according to the increased load on the bypass cable, simultaneously reduce the second load so that the total load carried by the bypass cable remains unchanged;

[0063] Specifically, when performing load switching, compared to the existing technology of directly loading all loads onto the bypass cable, the present invention, when performing switching, since the bypass cable is loaded with a second load, adopts a gradual loading method when switching the first load to the bypass cable, and then reduces the second load synchronously according to the increased load on the bypass cable, so that the total load carried by the bypass cable remains unchanged. In this way, it can be ensured that the bypass cable always works under the state of the first load, and the power output state of the bypass cable remains unchanged, and it can prevent sudden load changes during circuit switching, and can ensure a stable and safe power transmission state until the first load is fully loaded onto the bypass cable, thereby achieving seamless load switching. At this time, the main power line can be used as a backup line and can be repaired.

[0064] S4. Until the first load is completely loaded from the main power line to the bypass cable, the second load carried by the bypass cable is zero, and the load switching between the bypass cable and the main power line is realized. When the bypass cable completely bears all the first loads, the main power line is relatively in a standby state. At this time, the skylight can be opened for maintenance or replacement according to actual needs.

[0065] An analysis of the above method of this embodiment shows that there are five key points when executing the above steps. These five key points are the key control processes that determine whether the method of this embodiment can be implemented and ensure that it can achieve the preset technical effects. These five key points are explained below.

[0066] Key point 1

[0067] In step S2, when configuring the bypass cable to carry a second load equal to the first load, an external load needs to be applied to the bypass cable. During this process, although there are no external electrical devices connected, it is necessary to ensure that the load can be smoothly loaded onto the bypass cable to prevent the bypass cable from being instantly broken down. To address this issue, a load loading strategy is formulated, including the following:

[0068] Use a step-by-step load increase method, starting from zero and gradually increasing the load;

[0069] During the load increase process, the electrical parameters of the bypass cable are monitored, including current, voltage, frequency and temperature;

[0070] Construct a load change model by using a reinforcement learning network. Based on the historical data of load transfer, the load transfer speed is used as the input parameter and the stability change of the electrical parameters is used as the output parameter to train the load change model.

[0071] With the goal of transferring load as quickly as possible, the speed of load transfer is continuously adjusted, the variables of the load change model are optimized, and the optimal load increase strategy is solved within the constraints.

[0072] Through the above-mentioned load loading strategy, according to the actual load loading requirements and the performance of different bypass cables, while satisfying the stable changes in the electrical parameters of the bypass cables, the fastest load loading plan can be formulated, so that a second load equal to the first load can be quickly applied to the bypass cable.

[0073] Key point 2

[0074] In step S2, after the bypass cable is configured to carry a second load identical to the first load, step S3 cannot be directly executed in this case because, even if the load carried by the bypass cable is identical to the load carried by the main power line, the operating states of a cable that has been operating under a certain load for a long time and a cable that has just been carrying a certain load are different.

[0075] Therefore, before executing step S3, it is necessary to monitor and compare the electrical parameters of the bypass cable and the main power line. The electrical parameters include current, voltage, frequency, and temperature. Step S3 is not executed until the electrical parameters of the bypass cable and the main power line are consistent.

[0076] Specifically, in some cases, when all electrical parameters cannot be completely consistent, a certain threshold range can be set according to actual needs, and step S3 is executed when the threshold range is reached.

[0077] Key point three

[0078] In step S3, a portion of the first load is transferred from the main power line to the bypass cable. The amount of the first load taken each time determines whether a sudden change will occur during the switching process. If the first load taken each time is too large, the probability of a sudden change will increase. If the first load taken each time is too small, although the probability of a sudden change will be reduced, the overall speed of load switching will also be affected. Therefore, a strategy is needed to explore the threshold of load adjustment, determine the upper and lower limits of load migration, and construct a load migration model, including:

[0079] Obtain real-time power system parameter information, including real-time data on current, voltage, frequency and temperature of bypass cables and main power lines;

[0080] Set load adjustment thresholds to establish upper and lower limits for load migration;

[0081] Input the acquired electrical system parameter information and the set load adjustment threshold into the algorithm model to calculate the load required to be transferred from the main power line to the bypass cable;

[0082] Based on the load migration requirements output by the algorithm model, the load on the main power line is gradually adjusted, while the load on the bypass cable is increased;

[0083] Continuously monitor the load on the bypass cables and main power lines to ensure that the total load is maintained at the set value and dynamically adjust it based on real-time data.

[0084] The load migration model provided in this embodiment can continuously explore the upper and lower limits of load migration while ensuring the stability of the bypass cable and the main power line, realize load migration within the upper and lower limits of the load migration, and obtain the optimal load migration amount.

[0085] Specifically, in order to ensure the safety of load migration, when the load migration model is used to execute the load migration strategy, the upper limit of the load adjustment threshold must be controlled. In the process of continuous iterative optimization of the load migration model, the upper limit of the load migration may be gradually adjusted according to demand. However, in actual construction safety, when the total amount of load migration is large and the amount of load migration each time is too large, safety hazards are likely to occur. Therefore, in this embodiment, considering the safety of actual construction, when setting the load adjustment threshold, it is determined that the upper limit of the threshold for each load adjustment does not exceed 10% of the total load. This threshold serves as the safety threshold for load adjustment.

[0086] Key Point Four

[0087] In step S3, the second load is reduced synchronously according to the increased load on the bypass cable, so that the total load carried by the bypass cable remains unchanged. In this process, the two loads need to change synchronously, otherwise overload or underload will occur, which will affect the stable transmission of power. In this embodiment, in order to achieve the synchronization effect, a PID controller is used to adjust the second load, including the following steps:

[0088] The increased load on the bypass cable is obtained as an independent variable, which is the input of the PID controller;

[0089] Obtain the total load carried by the bypass cable and use it to calculate the second load change, that is, the adjustment amount, which is the output of the PID controller;

[0090] Obtaining real-time second load change;

[0091] An error is calculated according to the second load variation obtained in real time and the calculated second load variation, and the second load variation is readjusted until the second load variation obtained in real time and the calculated second load variation are zero.

[0092] Through the above steps, the output of the PID controller is directly or indirectly used to adjust the second load, which can ensure that when two loads are loaded simultaneously on the same cable, the independent variable and the adjustment amount can be adjusted synchronously, ensuring that the total amount of the two loads loaded on the cable remains unchanged.

[0093] Key Point Five

[0094] In step S3, a portion of the first load is loaded from the main power line onto the bypass cable, and the second load is reduced synchronously according to the increased load on the bypass cable, so that the total load carried by the bypass cable remains unchanged. In this process, the normal operation of the bypass cable needs to be ensured. Therefore, the status of the bypass cable needs to be monitored, including:

[0095] Monitor current and voltage: Use ammeters and voltmeters to monitor the current and voltage changes of the bypass cable and main power line in real time to ensure smooth transition of current and voltage without sudden changes;

[0096] Temperature monitoring: Use a temperature sensor to monitor the temperature of the bypass cable connection point to ensure that the temperature does not exceed the safe range;

[0097] Monitor insulation resistance: Use an insulation resistance tester to monitor the insulation resistance of the bypass cable to ensure good insulation performance

[0098] Specifically, during the use of the bypass cable, it is also necessary to ensure the normal operation of the bypass cable. The integrated current, voltage, and temperature monitoring functions can monitor the current, voltage, and temperature changes in real time during operation, making the operation safer. The integrated insulation resistance test function improves the efficiency of the bypass system insulation resistance test and shortens the operation time.

[0099] Specifically, the above method of this embodiment is improved to further include:

[0100] S5. After the bypass cable is switched to the main power line, the main power line is isolated and the isolated part of the main power line is repaired or replaced. After isolation, the main power line is ensured to be completely disconnected. When the main power line is opened for repair or the entire section is replaced, the safety of the construction workers can be guaranteed.

[0101] Specifically, after the maintenance is completed, the main power line is reconnected, which also includes:

[0102] S6-1. After the main power line is overhauled, configure the main power line to carry a third load that is the same as the first load;

[0103] S6-2. Load a portion of the first load from the bypass cable onto the main power line. Based on the increased load on the main power line, reduce the third load simultaneously, so that the total load on the main power line remains unchanged.

[0104] S6-3, until the first load is completely loaded from the bypass cable to the main power line, and the third load carried by the main power line is zero, load switching between the main power line and the bypass cable is achieved.

[0105] Among them: the strategy of configuring the main power line to carry a third load that is the same as the first load in step S6-1 is the same as the strategy of configuring the bypass cable to carry a second load that is the same as the first load in step S2. Step S6-2, taking part of the first load from the bypass cable and loading it onto the main power line, and synchronously reducing the third load according to the increased load on the main power line so that the total load carried on the main power line remains unchanged, is the same as the strategy of taking part of the first load from the main power line and loading it onto the bypass cable, and synchronously reducing the second load according to the increased load on the bypass cable so that the total load carried on the bypass cable remains unchanged in step S3. For specific strategies, please refer to the above content and will not be repeated here. Example 2

[0106] In order to implement the method of the above-mentioned embodiment 1, the present invention further provides a system for performing non-stop maintenance on the main power line using a bypass shelter, comprising:

[0107] A bypass cabin, wherein a bypass cable is provided in the bypass cabin and the bypass cable can be connected to the main power line;

[0108] a first load monitoring unit capable of monitoring electrical parameters of a first load on the main power line, including current, voltage, frequency, and temperature;

[0109] a first load distribution unit capable of distributing a first load between the main power line and the bypass cable;

[0110] a second load applying unit capable of configuring the bypass cable to carry a second load that is the same as the first load;

[0111] a second load monitoring unit capable of monitoring electrical parameters of the second load on the bypass cable, including current, voltage, frequency and temperature;

[0112] The second load regulating unit reduces the second load synchronously according to the increased load on the bypass cable, so that the total amount of load carried by the bypass cable remains unchanged.

[0113] Reference Figure 2 As shown, the bypass shelter includes:

[0114] The mounting frame 1 has a multi-layer bearing structure. The sides of the mounting frame 1 are provided with openable mounting doors. When the bypass shelter is moved, the mounting frame 1 is closed through the mounting doors. When the bypass shelter is in use, the mounting doors are opened;

[0115] a cable reel 2, provided in the mounting frame 1, comprising a manual reel and an automatic reel, the cable reel 2 being capable of reeling in a bypass cable connected to the main power cable;

[0116] An ATS cabinet 3 is slidably disposed in the mounting frame 1 and can be pulled out of the bypass shelter when the bypass shelter is deployed. The first load monitoring unit, the first load distribution unit, the second load application unit, the second load monitoring unit, and the second load adjustment unit are all integrated in the ATS cabinet 3. The ATS cabinet 3 serves as the control center of the entire bypass shelter.

[0117] Universal wheels 4 are provided at the bottom of the mounting frame 1 to support the mounting frame 1 and facilitate the movement of the mounting frame 1;

[0118] An insulating cross arm 5 is hinged at one end in the mounting frame 1. When the bypass cabin is not in use, the insulating cross arm 5 can be rotated and retracted into the mounting frame 1. When the bypass cabin is in use, the insulating cross arm 5 can be rotated and protrude from the mounting frame 1. A plurality of insulating clamps are provided on the insulating cross arm 5 to clamp and fix the bypass cable.

[0119] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for non-stop maintenance of main power lines using a bypass shelter, characterized in that: include: S1. Prepare a bypass shelter and connect the bypass cable of the bypass shelter to the main power line, wherein: the main power line carries the first load and the bypass cable is in a standby state; S2. Prepare a bypass cable to carry a second load that is the same as the first load; S3. Loading a portion of the first load from the main power line onto the bypass cable, and synchronously reducing the second load according to the increased load on the bypass cable, so that the total load carried by the bypass cable remains unchanged; including: Obtain real-time power system parameter information, including real-time data on current, voltage, frequency and temperature of bypass cables and main power lines; Set load adjustment thresholds to establish upper and lower limits for load migration; Input the acquired electrical system parameter information and the set load adjustment threshold into the algorithm model to calculate the load required to be transferred from the main power line to the bypass cable; Based on the load migration requirements output by the algorithm model, the load on the main power line is gradually adjusted, while the load on the bypass cable is increased; Continuously monitor the load on the bypass cables and main power lines to ensure the total load remains at the set value and make dynamic adjustments based on real-time data; S4, until the first load is completely loaded from the main power line to the bypass cable, and the second load carried by the bypass cable is zero, load switching between the bypass cable and the main power line is achieved; S5. After the bypass cable and the main power line are switched, the main power line is isolated and the isolated part of the main power line is inspected or replaced.

2. The method for non-stop maintenance of main power lines using a bypass shelter according to claim 1 is characterized in that: In step S2, the bypass cable is configured to carry a second load that is the same as the first load, including: Use a step-by-step load increase method, starting from zero and gradually increasing the load; During the load increase process, the electrical parameters of the bypass cable are monitored, including current, voltage, frequency and temperature; Construct a load change model by using a reinforcement learning network. Based on the historical data of load transfer, the load transfer speed is used as the input parameter and the stability change of the electrical parameters is used as the output parameter to train the load change model. With the goal of transferring load as quickly as possible, the speed of load transfer is continuously adjusted, the variables of the load change model are optimized, and the optimal load increase strategy is solved within the constraints.

3. The method for non-stop maintenance of main power lines using a bypass shelter according to claim 1 is characterized in that: In step S2, after the bypass cable is configured to carry a second load that is the same as the first load, the electrical parameters on the bypass cable and the main power line are monitored and compared. The electrical parameters include: current, voltage, frequency and temperature. The electrical parameters of the bypass cable and the main power line are consistent, and then step S3 is executed.

4. The method for non-stop maintenance of main power lines using a bypass shelter according to claim 1 is characterized in that: When setting the load adjustment threshold, it is determined that the upper limit of the threshold for each load adjustment does not exceed 10% of the total load.

5. The method for non-stop maintenance of main power lines using a bypass shelter according to claim 1 is characterized in that: In step S3, according to the increased load on the bypass cable, the second load is synchronously reduced so that the total load carried by the bypass cable remains unchanged, and the second load is adjusted using a PID controller, including: Obtaining the increased load on the bypass cable and the total load carried by the bypass cable to calculate a second load change; Obtaining real-time second load change; An error is calculated according to the second load variation obtained in real time and the calculated second load variation, and the second load variation is readjusted until the second load variation obtained in real time and the calculated second load variation are zero.

6. The method for non-stop maintenance of main power lines using a bypass shelter according to claim 1 is characterized in that: In step S3, while a portion of the first load is loaded from the main power line onto the bypass cable, and the second load is synchronously reduced according to the increased load on the bypass cable so that the total load carried by the bypass cable remains unchanged, the state of the bypass cable is monitored, including: Monitor current and voltage: Use ammeters and voltmeters to monitor the current and voltage changes of the bypass cable and main power line in real time to ensure smooth transition of current and voltage without sudden changes; Temperature monitoring: Use a temperature sensor to monitor the temperature of the bypass cable connection point to ensure that the temperature does not exceed the safe range; Monitor insulation resistance: Use an insulation resistance tester to monitor the insulation resistance of the bypass cable to ensure good insulation performance.

7. The method for non-stop maintenance of main power lines using a bypass shelter according to claim 1, characterized in that: Also includes: S6-1. After the main power line is overhauled, configure the main power line to carry a third load that is the same as the first load; S6-2. Load a portion of the first load from the bypass cable onto the main power line. Based on the increased load on the main power line, reduce the third load simultaneously, so that the total load on the main power line remains unchanged. S6-3, until the first load is completely loaded from the bypass cable to the main power line, and the third load carried by the main power line is zero, load switching between the main power line and the bypass cable is achieved.

8. A system for performing non-stop maintenance on a main power line using a bypass shelter, for implementing the method described in any one of claims 1 to 7, characterized in that: include: A bypass cabin, wherein a bypass cable is provided in the bypass cabin and the bypass cable can be connected to the main power line; a first load monitoring unit capable of monitoring electrical parameters of a first load on the main power line, including current, voltage, frequency, and temperature; a first load distribution unit capable of distributing a first load between the main power line and the bypass cable; a second load applying unit capable of configuring the bypass cable to carry a second load that is the same as the first load; a second load monitoring unit capable of monitoring electrical parameters of the second load on the bypass cable, including current, voltage, frequency and temperature; The second load regulating unit reduces the second load synchronously according to the increased load on the bypass cable, so that the total amount of load carried by the bypass cable remains unchanged.

Images