SF6 circuit breaker arc extinguishing medium anti-liquefaction device, method and system and storage medium

Abstract

The invention discloses an SF6 circuit breaker arc extinguishing medium anti-liquefaction device, method and system and a storage medium, and the device comprises a temperature measurement unit which is used for monitoring the environment temperature and the air chamber housing temperature; and the gas taking and heating recharging unit is used for heating and pressurizing the gas flowing into the heating recharging unit from the gas chamber according to the measured temperature so as to charge the heated gas into the gas chamber. The method comprises the steps that an environment temperature threshold value and a shell temperature threshold value are preset; environment temperature data are obtained, and when the environment temperature value is smaller than or equal to a preset environment temperature threshold value, an anti-liquefaction device is started; air chamber shell temperature data are obtained, when the shell temperature value is smaller than or equal to a preset shell temperature threshold value, the anti-liquefaction device is kept running, the next step is executed, and otherwise, running of the anti-liquefaction device is suspended; acquiring environment temperature data, and executing the previous step when an environment temperature value is smaller than or equal to a preset environment temperature threshold value; otherwise, stopping the anti-liquefaction device. On the premise that the structure of the circuit breaker is not changed, preventive control over low-temperature liquefaction of the arc extinguishing medium is achieved.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage electrical equipment technology, specifically relating to a device, method, system, and storage medium for preventing the liquefaction of SF6 gas inside a sulfur hexafluoride circuit breaker in cold regions. Background Technology

[0002] SF6 gas is a commonly used insulating and arc-quenching medium in high-voltage circuit breakers. However, it is prone to liquefaction at low temperatures, especially in extremely cold regions where ambient temperatures can drop below -40°C. This leads to a decrease in the pressure and density of SF6 gas in the circuit breaker chamber, resulting in a loss of insulation and breaking capacity, which seriously threatens the safety of electrical equipment and, consequently, the safety of the power grid.

[0003] Numerous domestic publications have reported on cryogenic liquefaction prevention control, such as the cryogenic liquefaction prevention device for a porcelain-column circuit breaker with patent number 202210971366.8, which belongs to the field of high-voltage circuit breaker technology. Its technical means for preventing cryogenic liquefaction involves installing electric heating elements, temperature sensors, and a mixing device for gas flow inside the arc-extinguishing chamber. Specifically, a transmission beam is fixed to the upper end of the base frame, an electrical control device is fixed to the side wall of the base frame, an insulating support is fixed to the upper end of the transmission beam, and the arc-extinguishing chamber is fixed to the upper end of the insulating support. Multiple electric heating elements are evenly spaced and fixed along the circumference of the inner wall of the arc-extinguishing chamber, and a temperature sensor is fixed to the inner wall of the arc-extinguishing chamber. Both the electric heating elements and the temperature sensor are electrically connected to the electrical control device. The arc-extinguishing chamber contains a mixing device for generating flow of sulfur hexafluoride gas, which can prevent the equipment from experiencing abnormal liquefaction of sulfur hexafluoride gas. Its drawbacks include the need to modify the internal structure of the circuit breaker or redesign the structure of the newly commissioned circuit breaker, which involves the modification of relevant standards and reliability testing of the circuit breaker.

[0004] For horizontal circuit breakers, the common approach is to install electric heating cables or insulated boxes outside the circuit breaker's gas chamber. These methods have the following drawbacks: 1) Low thermal efficiency, as heat must be conducted through the tank, with most of it lost to the environment; 2) Slow response, unable to quickly cope with sudden temperature drops; 3) Uneven heating, easily leading to temperature gradients inside the gas chamber, posing a risk of localized liquefaction. For column-type circuit breakers, there is currently no suitable method to prevent liquefaction in low-temperature environments.

[0005] For circuit breakers in operation, especially column-type circuit breakers, due to structural limitations or sealing requirements, achieving precise and reliable liquefaction prevention control by installing temperature and pressure sensors and heating components inside the gas chamber involves more difficult engineering modifications and too many unreliable factors. Therefore, there is an urgent need for a solution that can effectively prevent SF6 gas liquefaction by monitoring and heating external factors of the circuit breaker gas chamber. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention provides a device, method, system, and storage medium that can effectively prevent SF6 gas liquefaction by monitoring the external temperature of the circuit breaker gas chamber. It features high thermal efficiency, fast response, and wide applicability, and is particularly suitable for the anti-liquefaction technology transformation of circuit breakers in high-altitude and cold regions.

[0007] The technical solution adopted in this invention is as follows: An SF6 circuit breaker arc-extinguishing medium anti-liquefaction device, comprising: The temperature measurement unit includes an ambient temperature sensor that monitors the ambient temperature and a housing temperature sensor that monitors the temperature of the circuit breaker chamber housing. The gas extraction unit is connected to the circuit breaker gas chamber via a gas extraction pipeline and is used to extract arc-extinguishing gas from the gas chamber. The heating and recharging unit heats and pressurizes the extracted gas according to the ambient temperature and the temperature of the gas chamber shell, and then fills the circuit breaker gas chamber with the heated gas to prevent the medium inside the gas chamber from liquefying.

[0008] Furthermore, the gas intake unit includes a gas intake pipeline and several valves. One end of the gas intake pipeline is connected to the gas intake port of the circuit breaker gas chamber, and the other end of the gas intake pipeline is connected to the inlet of the heating and recharging unit. At least an inlet valve and an outlet valve are provided on the gas intake pipeline.

[0009] Furthermore, the heating and recharging unit includes a heating chamber and a booster pump. The heating chamber housing is provided with an air outlet and an air inlet that communicate with the chamber. The air inlet is the inlet of the heating and recharging unit. The inlet and outlet of the pump are respectively connected to the air outlet of the chamber and the air return port of the circuit breaker chamber through pipelines. An electric heating rod is installed in the heating chamber, and a temperature sensor for detecting the heating temperature of the gas in the chamber is also installed in the chamber. An insulation layer is installed on the outside of the heating chamber shell to prevent heat loss from the chamber.

[0010] Furthermore, the housing temperature sensor is installed on the outer wall surface of the circuit breaker chamber.

[0011] Furthermore, the housing temperature sensor is installed in close contact with the outer wall of the circuit breaker gas chamber using thermally conductive adhesive and metal clamps. An anti-radiation shield is installed on the outside of the housing temperature sensor to accurately sense the housing temperature, which represents the lowest temperature of the gas inside the gas chamber.

[0012] A method for preventing liquefaction of the arc-extinguishing medium in an SF6 circuit breaker, based on any of the aforementioned SF6 circuit breaker arc-extinguishing medium liquefaction prevention devices, includes the following steps: S1: Preset ambient temperature threshold, preset housing temperature threshold, preset ambient temperature threshold > preset housing temperature threshold; S2: Obtain ambient temperature data. When the ambient temperature value is less than or equal to the preset ambient temperature threshold, start the anti-liquefaction device. S3: Obtain the shell temperature data. If the shell temperature value is less than or equal to the preset shell temperature threshold, proceed to step S4; otherwise, suspend the operation of the anti-liquefaction device. S4: Obtain ambient temperature data. If the ambient temperature value is less than or equal to the preset ambient temperature threshold, proceed to step S3; otherwise, stop the operation of the anti-liquefaction device.

[0013] Before step S1 is executed, start the entire system and start the temperature measurement unit; The step S2 described above involves starting the anti-liquefaction device by activating the gas intake unit and the heating and recharging unit, opening the relevant valves, allowing the insulating medium gas in the circuit breaker gas chamber to flow into the heating chamber of the heating and recharging unit, activating the heating rod to heat the gas, and once the heating target is achieved, activating the booster pump to pressurize the heated gas into the gas chamber. The step S3 mentioned in "pausing the operation of the anti-liquefaction device" means shutting down the gas intake unit and the heating recharge unit while keeping the temperature measuring unit running. The step of stopping the operation of the anti-liquefaction device in step S4 means shutting down the entire device after the anti-liquefaction device has been suspended.

[0014] The methods described above assume that the system is running online. In certain appropriate circumstances, the system can also be shut down.

[0015] The shell temperature threshold T_s1 is the liquefaction temperature T_l of SF6 gas at the rated pressure of the circuit breaker, plus the empirical temperature difference ΔT between the circuit breaker chamber shell and the internal gas, plus the safety margin M. The formula is T_s1=T_l+ΔT+M.

[0016] This application also provides an SF6 circuit breaker arc-extinguishing medium anti-liquefaction system, including the anti-liquefaction device as described above and an electronic device; the electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the steps of any of the SF6 circuit breaker arc-extinguishing medium anti-liquefaction methods described above.

[0017] This application also provides a storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of any of the above-described methods for preventing the liquefaction of arc-extinguishing media in SF6 circuit breakers.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention perfectly solves the engineering problem of needing to modify the internal structure of the circuit breaker or redesign the structure of the circuit breaker to be put into operation when installing heating components and temperature and pressure sensors inside the gas chamber. It creatively uses the measurable temperature parameters on the outside of the circuit breaker gas chamber shell as the control basis and adopts the method of gas intake heating and recharging. Under the premise of not changing the circuit breaker structure as much as possible, it realizes the low-temperature anti-liquefaction control of the circuit breaker insulation medium. It is especially suitable for the low-temperature anti-liquefaction retrofit of existing circuit breakers in high-altitude and cold regions.

[0019] The anti-liquefaction method of this invention utilizes the difference between the ambient temperature and the gas chamber shell temperature and their respective expected targets to achieve intelligent control of the anti-liquefaction device, improving energy efficiency while ensuring equipment safety. Setting a conservative threshold with a safety margin for the gas chamber shell temperature achieves "preventative" control, ensuring that the gas inside the circuit breaker intervenes in advance before any potential liquefaction occurs, ensuring reliable and safe control.

[0020] The heating method of this invention adopts active gas circulation heating in the gas chamber, which has a much higher thermal efficiency than external heating. Furthermore, the gas flow makes the temperature field inside the gas chamber more uniform, avoiding local liquefaction. Attached Figure Description

[0021] Figure 1 This is one of the structural schematic diagrams of the SF6 circuit breaker arc-extinguishing medium anti-liquefaction device of the present invention; Figure 2 This is the second schematic diagram of the structure of the SF6 circuit breaker arc-extinguishing medium anti-liquefaction device of the present invention; Figure 3 This is a flowchart of the anti-liquefaction method of the present invention; Figure 4 This is a logic control flowchart of the anti-liquefaction method of the present invention.

[0022] Figure 1 In the middle, 1-gas intake pipeline, 2-heating chamber, 3-heating rod; 4-boost pump, 5-shell temperature sensor; 9-circuit breaker gas chamber. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. The circuit breaker referred to in this application is a high-voltage switching electrical device that needs to prevent liquefaction.

[0024] An SF6 circuit breaker arc-extinguishing medium anti-liquefaction device, comprising: The temperature measurement unit includes an ambient temperature sensor that monitors the ambient temperature and a housing temperature sensor that monitors the temperature of the circuit breaker chamber housing. The gas extraction unit is connected to the circuit breaker gas chamber via a gas extraction pipeline and is used to extract arc-extinguishing gas from the gas chamber. The heating and recharge unit heats and pressurizes the gas taken in, based on the ambient temperature and the temperature of the gas chamber shell, and fills the circuit breaker gas chamber with the heated gas to prevent the medium inside the gas chamber from liquefying.

[0025] The housing temperature sensor is installed on the outer wall of the circuit breaker's gas chamber.

[0026] Preferably, the housing temperature sensor is installed on the lower part of the outer wall of the circuit breaker's gas chamber.

[0027] Preferably, the housing temperature sensor is installed in close contact with the outer wall of the circuit breaker gas chamber using thermally conductive adhesive and metal clamps. A radiation shield can also be installed on the outside of the housing temperature sensor to accurately sense the housing temperature, which represents the lowest temperature of the gas inside the gas chamber.

[0028] Specifically, the housing temperature sensor uses a PT100 platinum resistance thermometer.

[0029] Preferably, the ambient temperature sensor is installed in the shade of the circuit breaker to avoid the influence of sunlight on the temperature.

[0030] The gas intake unit includes a gas intake pipeline and several valves. One end of the gas intake pipeline is connected to the gas intake port of the circuit breaker gas chamber, and the other end of the gas intake pipeline is connected to the inlet of the heating and recharging unit. At least an inlet valve and an outlet valve are provided on the gas intake pipeline. The heating and recharging unit includes a heating chamber and a booster pump. The heating chamber housing is provided with an air outlet and an air inlet that communicate with the chamber. The air inlet is the inlet of the heating and recharging unit. The inlet and outlet of the booster pump are respectively connected to the air outlet of the chamber and the air return port of the circuit breaker chamber through pipelines. A heating rod is installed inside the heating chamber, and a temperature sensor for detecting the heating temperature of the gas inside the chamber is also installed inside the chamber. An insulation layer is installed on the outside of the heating chamber shell to prevent heat loss from the chamber.

[0031] The heating rod is an armored electric heating rod.

[0032] In one embodiment, such as Figure 2 As shown, the return air port and the air intake port of the circuit breaker air chamber are the same port, which is the reserved air intake port, air replenishment port, or detection port of the circuit breaker.

[0033] The gas extraction unit extracts a portion of the arc-extinguishing medium gas from the circuit breaker gas chamber, and the heating and recharging unit heats the extracted gas in a heating chamber before pressurizing and recharging it into the circuit breaker gas chamber. Both processes can be continuous or intermittent.

[0034] In one embodiment, the gas sampling unit and the heating and recharging unit are continuously cyclical. The gas sampling unit extracts a portion of gas from the circuit breaker gas chamber, and the heating and recharging unit heats the extracted arc-extinguishing medium gas and then pressurizes it before recharging it back into the circuit breaker gas chamber. Figure 1 As shown, the gas taken from the gas intake unit enters the heating and recharging unit, and after being heated, it is recharged into the circuit breaker gas chamber.

[0035] In one embodiment, the gas extraction unit and the heating and recharging unit adopt an open-loop mode, that is, a portion of gas is periodically extracted from the gas chamber, heated, and then pressurized and recharged, rather than in a continuous cycle. Figure 2 The embodiments shown must employ a vacuuming and refilling reuse mode, i.e., a non-continuous cycle mode.

[0036] In one embodiment, such as Figure 1 As shown, the gas intake unit includes a gas intake pipeline and several valves. One end of the gas intake pipeline is connected to the gas intake port of the circuit breaker gas chamber, and the other end is connected to the inlet of the heating and recharging unit. Valves V1 and V2 are respectively located at the gas intake port of the circuit breaker gas chamber and the inlet of the heating and recharging unit. They can be solenoid valves for convenient electrical control or manual valves. When the gas pressure in the circuit breaker gas chamber is higher than the pressure in the gas intake pipeline, the SF6 insulating medium in the gas chamber will flow to the heating and recharging unit. Figure 1 In the image, the arrow indicates the direction of airflow in the insulating medium.

[0037] In one embodiment, such as Figure 1 As shown, the heating and recharging unit includes a heating chamber and a booster pump. The heating chamber housing has an outlet and an inlet communicating with the chamber; the inlet serves as the inlet for the heating and recharging unit. The inlet and outlet of the booster pump are connected to the outlet of the chamber and the return port of the circuit breaker gas chamber via pipelines, respectively. An electric heating rod is installed inside the heating chamber, along with a temperature sensor to detect the heating temperature of the gas within the chamber. An insulation layer is installed on the outside of the heating chamber housing to prevent heat loss. The electric heating rod is an armored electric heating rod. When the arc-extinguishing medium inside the circuit breaker is SF6 gas, the pump is a miniature magnetic pump resistant to SF6 gas. Figure 1 In the diagram, the arrows indicate the direction of the insulating medium airflow. Valves V3 and V4 are respectively located at the outlet of the heating recharge unit and the return port of the circuit breaker gas chamber. Similarly, they can be solenoid valves for convenient electrical control, or they can be manual valves.

[0038] For methods of preventing liquefaction, see [link to relevant documentation]. Figure 3 Get the ambient temperature value T_env and the shell temperature value T_shell.

[0039] In one embodiment, step S1: preset ambient temperature threshold, preset housing temperature threshold, preset ambient temperature threshold > preset housing temperature threshold; In step S2, the preset environmental threshold is -10℃. When the detected environmental temperature value T_env ≤ -10℃, the anti-liquefaction device is activated. Step S3: Obtain the circuit breaker's casing temperature data. If the casing temperature value T_shell ≤ the preset casing temperature threshold (-20℃), keep the anti-liquefaction device running and proceed to step S4; otherwise, suspend the operation of the anti-liquefaction device. Step S4: Obtain ambient temperature data. If the ambient temperature value T_env ≤ preset ambient temperature threshold (-10℃), proceed to step S3; otherwise, stop the operation of the anti-liquefaction device.

[0040] Before step S1, start the entire system and start the temperature measurement unit.

[0041] In step S2, the anti-liquefaction device is activated, and the gas extraction unit and heating and recharging unit are started. Specifically, as follows... Figure 1 and Figure 2 As shown, the gas inlet valve V1 of the gas intake unit and the gas inlet valve V2 of the heating and recharging unit are opened, and the insulating medium gas in the circuit breaker gas chamber flows into the heating chamber of the heating and recharging unit, starting the heating function. When the heating target is reached, the gas outlet valve V3 of the heating chamber and the gas outlet valve V4 of the booster pump connected to the gas chamber are opened, and the booster pump is started to pressurize the heated gas into the circuit breaker gas chamber. The heating target can be a preset heating time or a preset heating temperature value.

[0042] In step S3, the operation of the anti-liquefaction device is paused, the gas intake unit and the heating and recharging unit are shut down, while the temperature measuring unit remains operational. Specifically, as follows... Figure 1 and Figure 2 As shown, close the air intake valve V1 of the air intake unit and the air intake valve V2 of the heating and recharging unit, turn off the heating function of the heating chamber of the heating and recharging unit, close the air outlet valve V3 of the heating chamber and the air outlet valve V4 of the booster pump connected to the air chamber, and turn off the booster pump; however, keep the temperature measuring unit running to monitor the ambient temperature and the temperature of the air chamber shell.

[0043] In step S4, the anti-liquefaction device is stopped from operating, and the entire device is shut down after the anti-liquefaction device is suspended.

[0044] The above-described liquefaction prevention methods assume the system is running online. Of course, the entire system can be shut down under certain appropriate circumstances. No restrictions are placed on this.

[0045] For circuit breakers of different voltage levels, the temperature threshold value for the circuit breaker chamber shell is set differently. This shell temperature threshold, T_s1, is equal to the liquefaction temperature T_l of SF6 gas at the circuit breaker's rated pressure, plus the empirical temperature difference ΔT between the circuit breaker chamber shell and the internal gas, plus a safety margin M. The formula is T_s1 = T_l + ΔT + M. The safety margin M ranges from 3℃ to 10℃. The temperature difference ΔT is empirical data.

[0046] This application also provides an SF6 circuit breaker arc-extinguishing medium anti-liquefaction system, including the anti-liquefaction device as described above and an electronic device; the electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the steps of the SF6 circuit breaker arc-extinguishing medium anti-liquefaction method as described above.

[0047] This application also provides a storage medium storing a computer program, which, when executed by a processor, implements the steps of any of the SF6 circuit breaker arc-extinguishing medium anti-liquefaction methods described above.

[0048] The SF6 circuit breaker arc-extinguishing medium liquefaction prevention method described above clearly relies on electronic equipment to achieve control. This electronic equipment can be a PLC controller with built-in logic control program; it can also be an MCU containing an embedded controller. The embedded controller has a small processor (such as a microcontroller) and memory, executes preset programs, and controls the liquefaction prevention device. A typical PLC controller includes: a processor (CPU module): responsible for executing programs, logic operations, control instructions, etc.; memory: including program memory (such as ROM, Flash, used to store user-written control programs) and data memory (such as RAM, used to temporarily store calculation data, intermediate results, etc.); and a computer program: the control program written by the user using programming software (such as ladder diagrams, instruction lists), stored in memory and executable by the processor.

[0049] The memory may include one or more storage media, which may be non-transitory. The memory may also include high-speed random access memory and non-volatile memory, such as one or more read-only memory devices or flash memory devices. In some embodiments, the non-transitory readable storage medium in the memory is used to store the aforementioned computer program, which is executed by a processor to implement the steps of the SF6 circuit breaker arc-extinguishing medium anti-liquefaction method provided in the method embodiments of this application.

[0050] The aforementioned electronic devices may also include display and human-machine interface devices. These devices may be integrated with or separate from the display and human-machine interface devices. The display and human-machine interface devices may be integrated, such as a touchscreen, or they may be separate, consisting of a display and a keyboard or other input devices.

[0051] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0052] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for preventing liquefaction of arc-extinguishing medium in an SF6 circuit breaker, characterized in that, include: The temperature measurement unit includes an ambient temperature sensor that monitors the ambient temperature and a housing temperature sensor that monitors the temperature of the circuit breaker chamber housing. The gas extraction unit is connected to the circuit breaker gas chamber via a gas extraction pipeline and is used to extract arc-extinguishing gas from the gas chamber. The heating and recharging unit heats and pressurizes the extracted gas according to the ambient temperature and the temperature of the gas chamber shell, and then fills the circuit breaker gas chamber with the heated gas to prevent the medium inside the gas chamber from liquefying.

2. The SF6 circuit breaker arc-extinguishing medium anti-liquefaction device according to claim 1, characterized in that: The gas intake unit includes a gas intake pipeline and several valves. One end of the gas intake pipeline is connected to the gas intake port of the circuit breaker gas chamber, and the other end of the gas intake pipeline is connected to the inlet of the heating and recharging unit. At least an inlet valve and an outlet valve are provided on the gas intake pipeline.

3. The SF6 circuit breaker arc-extinguishing medium anti-liquefaction device according to claim 1, characterized in that: The heating and recharging unit includes a heating chamber and a booster pump. The heating chamber housing is provided with an air outlet and an air inlet that communicate with the chamber. The air inlet is the inlet of the heating and recharging unit. The inlet and outlet of the pump are respectively connected to the air outlet of the chamber and the air return port of the circuit breaker chamber through pipelines. An electric heating rod is installed in the heating chamber, and a temperature sensor for detecting the heating temperature of the gas in the chamber is also installed in the chamber. An insulation layer is installed on the outside of the heating chamber shell to prevent heat loss from the chamber.

4. The SF6 circuit breaker arc-extinguishing medium anti-liquefaction device according to claim 1, characterized in that: The housing temperature sensor is installed on the outer wall of the circuit breaker's gas chamber.

5. The SF6 circuit breaker arc-extinguishing medium anti-liquefaction device according to claim 1, characterized in that: The housing temperature sensor is installed in close contact with the outer wall of the circuit breaker's gas chamber using thermally conductive adhesive and metal clamps. The housing temperature sensor is equipped with an anti-radiation shield to accurately sense the housing temperature, which represents the lowest temperature of the gas inside the gas chamber.

6. A method for preventing liquefaction of the arc-extinguishing medium in an SF6 circuit breaker, implemented using the SF6 circuit breaker arc-extinguishing medium liquefaction prevention device according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1: Preset ambient temperature threshold, preset housing temperature threshold, preset ambient temperature threshold > preset housing temperature threshold; S2: Obtain ambient temperature data. When the ambient temperature value is less than or equal to the preset ambient temperature threshold, start the anti-liquefaction device. S3: Obtain the shell temperature data. If the shell temperature value is less than or equal to the preset shell temperature threshold, proceed to step S4; otherwise, suspend the operation of the anti-liquefaction device. S4: Obtain ambient temperature data. If the ambient temperature value is less than or equal to the preset ambient temperature threshold, proceed to step S3. Otherwise, stop the operation of the anti-liquefaction device.

7. A method for preventing liquefaction of the arc-extinguishing medium in an SF6 circuit breaker according to claim 6, characterized in that: Before step S1 is executed, start the entire system and start the temperature measurement unit; The step S2 described above involves starting the anti-liquefaction device by activating the gas intake unit and the heating and recharging unit, opening the relevant valves, allowing the insulating medium gas in the circuit breaker gas chamber to flow into the heating chamber of the heating and recharging unit, activating the heating rod to heat the gas, and once the heating target is achieved, activating the booster pump to pressurize the heated gas into the gas chamber. The step S3 mentioned in "pausing the operation of the anti-liquefaction device" means shutting down the gas intake unit and the heating recharge unit while keeping the temperature measuring unit running. The step of stopping the operation of the anti-liquefaction device in step S4 means shutting down the entire device after the anti-liquefaction device has been suspended.

8. The method for preventing liquefaction of the arc-extinguishing medium in an SF6 circuit breaker according to any one of claims 6, characterized in that: The shell temperature threshold T_s1 is the liquefaction temperature T_l of SF6 gas at the rated pressure of the circuit breaker, plus the empirical temperature difference ΔT between the circuit breaker chamber shell and the internal gas, plus the safety margin M. The formula is T_s1=T_l+ΔT + M.

9. An SF6 circuit breaker arc-extinguishing medium anti-liquefaction system, characterized in that, include: The SF6 circuit breaker arc-extinguishing medium anti-liquefaction device according to any one of claims 1 to 5; It also includes an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the SF6 circuit breaker arc-extinguishing medium anti-liquefaction method as described in any one of claims 6 to 8.

10. A storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the steps of the SF6 circuit breaker arc-extinguishing medium anti-liquefaction method as described in any one of claims 6 to 8.

Images