Environment-friendly insulating gas non-equilibrium arc efficient breaking device and method
By combining multi-stage nozzles, heat dissipation devices, and catalytic composite units, the decomposition and recombination of environmentally friendly insulating gases under non-equilibrium arc conditions were solved, achieving efficient arc breaking and dielectric recovery, and improving the equipment's breaking capacity and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA ELECTRIC POWER RESEARCH INSTITUTE CO LTD
- Filing Date
- 2026-01-07
- Publication Date
- 2026-04-10
AI Technical Summary
Existing environmentally friendly insulating gases have problems such as easy decomposition, poor recombination performance, and serious non-equilibrium phenomena under non-equilibrium arc conditions, resulting in insufficient breaking capacity and poor equipment stability.
A combination device and method employing a multi-stage nozzle, a heat dissipation device, an excitation electrode, and a catalytic composite unit is used to dissipate arc energy in stages through the multi-stage nozzle, create a low-temperature environment using the heat dissipation device, actively intervene in the current zero-crossing process using the excitation electrode, and promote the recombination of decomposition products using the catalytic composite unit to achieve efficient switching.
It significantly improves the breaking capacity and dielectric recovery speed of environmentally friendly insulating gases, enhances the operational reliability and lifespan of the equipment, and approaches or reaches the level of SF6 circuit breakers.
Smart Images
Figure CN121839501A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of environmentally friendly gas-insulated power transmission and distribution equipment, and in particular to an environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device and method. Background Technology
[0002] Sulfur hexafluoride (SF6) gas is widely used in circuit breakers and gas-insulated switchgear (GIS) due to its excellent insulation and arc-quenching properties. However, SF6 is a potent greenhouse gas with a global warming potential (GWP) 24,300 times that of CO2 and an atmospheric lifetime of 1,000 years. With increasing global environmental awareness, finding and promoting the application of environmentally friendly alternative gases has become an urgent need for the power industry.
[0003] Currently, the most promising environmentally friendly insulating gases are mainly fluorine-containing gases (such as C4F7N, CF3SO2F, etc.), but these gases have many inherent defects when used as arc-quenching media in practical applications: (1) Easily decomposed: Under the high temperature of electric arc, the chemical bonds of these gases are easily broken, decomposing into a variety of low-fluoride compounds, carbon elements, etc. These decomposition products will reduce the insulation strength of the medium and may be toxic or corrosive, affecting the long-term stable operation of the equipment. (2) Poor recombination performance: After the arc is extinguished, the process of recombination and regeneration of the original gas by the decomposition products is slow and incomplete, resulting in insufficient insulation recovery performance of the gas medium, affecting the stability after the current is interrupted, and may even cause re-breakdown. (3) Severe non-equilibrium phenomena: Before and after the current crosses zero, the arc plasma is in a strong thermodynamic and chemical non-equilibrium state. The molecular structure of environmentally friendly gases is complex, and the variation law of their physical parameters such as thermal conductivity and electrical conductivity under non-equilibrium state is significantly different from that of SF6. As a result, the arc-extinguishing chamber structure and airflow field organization method designed based on SF6 gas cannot achieve efficient dissipation and cooling of arc energy, which seriously restricts the improvement of breaking capacity; Existing technologies mostly focus on optimizing gas configuration parameters or making simple improvements to the traditional arc-extinguishing chamber structure, failing to fundamentally solve the core physical problems of environmentally friendly gases under non-equilibrium electric arcs. For example, simply increasing the pressure of the compressor chamber or the nozzle size can enhance gas blowing, but may exacerbate the disordered decomposition of gases and has limited effect on promoting gas recombination. Summary of the Invention
[0004] To address the above problems, this invention proposes an environmentally friendly insulating gas non-equilibrium state high-efficiency arc breaking device and method. It can actively regulate the arc ignition and post-arc recovery process during short-circuit breaking based on the arc extinguishing performance of the environmentally friendly insulating gas, and particularly optimize the energy dissipation and dielectric recovery process of the arc in the non-equilibrium state, thereby achieving efficient, reliable, and high-capacity breaking.
[0005] This application proposes an environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device and method, characterized in that it includes: An arc-extinguishing chamber is used to house the stationary and moving contacts that generate the electric arc when the power is turned off. A multi-stage nozzle, including an upstream nozzle and a downstream nozzle, is arranged around the outside of the stationary contact and the moving contact, and uses environmentally friendly insulating gas to extinguish the electric arc. A heat dissipation device is connected to the interior of the multi-stage nozzle to provide a low-temperature environment; The compressor chamber, connected to the multi-stage nozzle, is used to provide compressed environmentally friendly insulating gas; An excitation electrode, connected to the stationary contact, applies a reverse high-voltage pulse when the current inside the arc approaches zero, in order to suppress arc reignition. A catalytic composite unit is located inside the arc-extinguishing chamber, downstream of the multi-stage nozzle, and is used to composite the environmentally friendly insulating gas.
[0006] Furthermore, the upstream nozzle and the downstream nozzle are respectively disposed outside the stationary contact and the moving contact, and the upstream nozzle and the downstream nozzle are connected in series along the airflow direction of the compressor chamber, and the upstream nozzle and the downstream nozzle are connected by a spiral channel.
[0007] Furthermore, the helical angle of the helical channel is within a certain range.
[0008] Furthermore, the upstream nozzle is made of high-temperature resistant ceramic or metal-ceramic composite material, and the inner wall of the downstream nozzle is smooth and made of high thermal conductivity metal.
[0009] Furthermore, a cooling wall is provided in a ring at the bottom of the stationary contact, and the cooling wall is connected to the bottom of the stationary contact to wrap around the bottom of the stationary contact, forming a cavity-structured cooling chamber.
[0010] Furthermore, the heat dissipation device is located outside the arc-extinguishing chamber, and the environmentally friendly insulating gas non-equilibrium arc high-efficiency breaking device is provided with a cooling channel. One end of the cooling channel is connected to the cooling chamber, and the other end of the cooling channel is connected to the heat dissipation device. The heat dissipation device provides a cooling medium to the cooling chamber through the cooling channel, and uses the cooling medium to accelerate the heat dissipation at the bottom of the stationary contact.
[0011] Furthermore, the downstream nozzle is opposite to the opening of the cooling chamber, and is connected to the heat dissipation device through the cooling chamber to receive the cooling medium from the heat dissipation device.
[0012] Furthermore, the excitation electrode is connected to a pulse power source, which provides a high-voltage pulse to the excitation electrode and transmits it to the stationary contact.
[0013] Furthermore, the catalytic composite unit is internally equipped with porous materials and catalysts to promote the recombination of the decomposition products of the environmentally friendly insulating gas during the arc extinguishing process.
[0014] A method for efficiently interrupting non-equilibrium arcs in environmentally friendly insulating gases, characterized by comprising the following steps: When the circuit is broken, an electric arc is generated between the moving and stationary contacts. The air chamber compresses the environmentally friendly insulating gas, generating a high-speed airflow that passes through a multi-stage nozzle to extinguish the electric arc. High-speed airflow drives the electric arc into the upstream nozzle, achieving initial cooling and confinement of the electric arc, reducing the ablation of the multi-stage nozzle, stationary contact and moving contact by the electric arc, and suppressing the disorderly decomposition of environmentally friendly insulating gas; The arc gas flow enters the downstream nozzle and is kept at a low temperature by the heat dissipation device, creating a low-temperature environment for the compounding of the decomposition products of the environmentally friendly insulating gas; and it greatly increases the airflow velocity, effectively increasing the pressure difference, which is beneficial for breaking. When the current inside the arc approaches zero, the excitation electrode is activated to inject a high-frequency pulse into the arc remnant, thereby improving the thermal recovery characteristics of the environmentally friendly insulating gas and suppressing the risk of current cutoff and reignition. After the current crosses zero, the decomposition products of the environmentally friendly insulating gas rapidly recombine at a lower temperature through the catalytic recombination unit.
[0015] The beneficial effects of this invention are as follows: By using a multi-stage nozzle to dissipate arc energy in stages and efficiently, while simultaneously utilizing a low-temperature environment created by a heat dissipation device to promote the recombination of decomposition products, the breaking capacity and dielectric recovery speed are simultaneously improved. By actively intervening in the current zero-crossing process through a high-frequency excitation electrode, the recovery process of the environmentally friendly gas dielectric strength better meets the requirements of circuit breaker breaking, fundamentally solving the problem of easy reignition caused by its poor non-equilibrium characteristics. The catalytic recombination unit solves the problem of poor recombination performance after environmentally friendly gas decomposition at the system level, reducing the gas degradation rate and improving the reliability and lifespan of the equipment. This invention can significantly improve the short-circuit current breaking capacity of circuit breakers using environmentally friendly insulating gases, enabling them to reach or approach the level of SF6 circuit breakers under the same conditions, and powerfully promoting the large-scale application of environmentally friendly gas high-voltage switchgear. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1A schematic flowchart illustrating an environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device and method provided in this application embodiment; Figure 2 This is a schematic diagram of the structure of an environmentally friendly insulating gas non-equilibrium state electric arc high-efficiency interruption device and method provided in the embodiments of this application; 1. Stationary contact; 10. Cooling chamber; 11. Cooling wall; 12. Cooling cover; 2. Moving contact; 3. Arc extinguishing chamber; 31. Cooling channel; 4. Multi-stage nozzle; 41. Upstream nozzle; 42. Downstream nozzle; 43. Spiral channel; 5. Heat dissipation device; 6. Compressor chamber; 7. Excitation electrode; 71. Pulse power source; 8. Catalytic composite unit. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other implementations obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. In the various drawings, the same elements are represented by the same or similar reference numerals, and for clarity, the various parts in the drawings are not drawn to scale.
[0019] See Figure 1 , 2As shown, this invention proposes an environmentally friendly insulating gas non-equilibrium state high-efficiency arc breaking device, characterized by comprising: an arc-extinguishing chamber 3 for accommodating a stationary contact 1 and a moving contact 2 that generate the arc when the power is turned off; a multi-stage nozzle 4, including an upstream nozzle 41 and a downstream nozzle 42, arranged around the arc of the stationary contact 1 and the moving contact 2, for extinguishing the arc; a heat dissipation device 5, connected to the interior of the multi-stage nozzle 4, for providing a low-temperature environment; a compression chamber 6, located inside the arc-extinguishing chamber 3 and connected to the multi-stage nozzle 4, for providing compressed environmentally friendly insulating gas; an excitation electrode 7, connected to the stationary contact 1, for applying a reverse high-voltage pulse when the current inside the arc approaches zero, for suppressing arc reignition; and a catalytic recombination unit 6, located inside the arc-extinguishing chamber 3 downstream of the multi-stage nozzle, for recombinating the environmentally friendly insulating gas. In this embodiment, the stationary contact 1, the moving contact 2, the multi-stage nozzle 4, the compression chamber 6, and the catalytic composite unit 8 are all disposed inside the arc-extinguishing chamber 3; the arc-extinguishing chamber 3 is made of high-strength insulating material. The compression chamber 6 is equipped with a highly efficient compression mechanism, capable of providing a large quantity of compressed environmentally friendly insulating gas in a short time, which is then ejected through the multi-stage nozzle 4. The catalytic composite unit 8 combines the decomposition products of the insulating gas generated during the breaking process to regenerate the environmentally friendly insulating gas, achieving gas recycling and reducing environmental impact.
[0020] See Figure 2 As shown, specifically, the upstream nozzle 41 and the downstream nozzle 42 are respectively disposed outside the stationary contact 1 and the moving contact 2. The upstream nozzle 41 and the downstream nozzle 42 are connected in series along the airflow direction of the compressor chamber 6, and are connected by a spiral channel 43. Specifically, the spiral angle of the spiral channel 43 is within a certain range. Preferably, the spiral angle is between 30-60°; in this embodiment, the spiral angle is 45°. Specifically, in this embodiment, the upstream nozzle 41 is made of high-temperature resistant ceramic or metal-ceramic composite material; the inner wall of the downstream nozzle 42 is smooth and made of a metal with high thermal conductivity.
[0021] See Figure 2As shown, specifically, the bottom of the stationary contact 1 is provided with a cooling chamber 10, and the bottom of the stationary contact 1 is provided with a cooling wall 11 in an annular shape. The cooling wall 11 is connected to the bottom of the stationary contact 1 and encloses the bottom of the stationary contact 1, forming a cavity structure cooling chamber 10. In this embodiment, the port of the cooling wall 11 is provided with a cooling cover 12. The cooling cover 12 is fixed to the cooling wall 11 and is perpendicular to the direction of the cooling wall 11 and the stationary contact 1. The bottom of the stationary contact 1 is located within the cooling chamber 10 and the cooling cover 12, which is used to maintain the low temperature of the bottom of the stationary contact 1 and prevent heat backflow and external impurities from entering the cooling chamber 10. Preferably, a gap is left between the cooling cover 21 and the stationary contact 1.
[0022] See Figure 2 As shown, specifically, the environmentally friendly insulating gas non-equilibrium arc high-efficiency interrupting device is equipped with a cooling channel 31. One end of the cooling channel 31 is connected to the cooling chamber 10, and the other end of the cooling channel 31 is connected to the heat dissipation device 5. The heat dissipation device 5 provides a cooling medium to the cooling chamber 10 through the cooling channel 31, thereby accelerating heat dissipation from the bottom of the stationary contact. Specifically, the heat dissipation device 5 is located outside the arc-extinguishing chamber 3. In this embodiment, the cooling wall 11 has a heat-insulating function and is made of a material with low thermal conductivity. The connection between the heat dissipation device 5 and the cooling chamber 10 ensures that the bottom of the stationary contact 1 maintains a stable low temperature during long-term operation.
[0023] See Figure 2 As shown, specifically, the downstream nozzle 42 is opposite to the opening of the cooling chamber 10, and is connected to the heat dissipation device 5 through the cooling chamber 10, receiving the cooling medium from the heat dissipation device 5. Specifically, the heat dissipation device 5 is an air-cooled radiator. In this embodiment, the cooling cover 12 introduces the cooling medium from the heat dissipation device 5 into the interior of the downstream nozzle 42, actively cooling the inner wall of the downstream nozzle 42; intensely cooling the gas boundary layer tightly adhering to the wall surface, forming a low-temperature, high-density "cold sheath"; providing favorable conditions for the rapid recombination and regeneration of the original gas from the arc decomposition products, accelerating the recovery and recombination of the thermal decomposition products of the environmentally friendly insulating gas.
[0024] See Figure 2As shown, specifically, the excitation electrode 7 is connected to a pulsed power source 71, which provides a high-voltage pulse to the excitation electrode 7 and transmits it to the stationary contact 1. In this embodiment, the excitation electrode 7 is embedded at the end of the stationary contact 1; it is used to inject a high-frequency pulsed current or a high-voltage pulsed electric field with specific parameters into the arc about to be extinguished within hundreds of microseconds before the current crosses zero, maintaining a moderate degree of ionization of the arc plasma during the current zero-crossing period, and avoiding the instability caused by its direct drop from the "thermal equilibrium state" to the "completely insulating state" due to the poor recombination of the environmentally friendly insulating gas. Through active control and adjustment, the recovery process of the gas medium strength after the arc is extinguished is made smoother and more controllable, thereby effectively preventing arc reignition.
[0025] See Figure 2 As shown, specifically, the catalytic composite unit 8 contains porous materials and a catalyst to promote the recombination of decomposition products of the environmentally friendly insulating gas during the arc extinguishing process. In this embodiment, the porous material uses honeycomb ceramics, foamed metal, etc., as a carrier, and the catalyst is mainly targeted at CF. x COF2 or specific transition metal oxides can be used to load the decomposition products of the environmentally friendly gas; these products are used to capture and catalyze the rapid recombination of the decomposition products of the environmentally friendly gas at lower temperatures, reduce the loss rate of the main insulating gas, purify the gas medium, restore its insulating properties, and create conditions for the recycling of the gas.
[0026] A method for efficiently interrupting non-equilibrium arcs in environmentally friendly insulating gases, characterized by comprising the following steps: S001. When the circuit is broken, an electric arc is generated between the moving contact and the stationary contact. The air chamber compresses the environmentally friendly insulating gas and generates a high-speed airflow that passes through a multi-stage nozzle to extinguish the electric arc. S002. High-speed airflow drives the electric arc into the upstream nozzle, achieving initial cooling and confinement of the electric arc, reducing the ablation of the multi-stage nozzle, stationary contact and moving contact by the electric arc, and suppressing the disorderly decomposition of environmentally friendly insulating gas. S003. The arc gas flow enters the downstream nozzle and is kept at a low temperature by the heat dissipation device, creating a low-temperature environment for the compounding of the decomposition products of the environmentally friendly insulating gas; and greatly increases the airflow velocity, effectively increasing the pressure difference, which is beneficial for breaking. S004. When the current inside the arc approaches zero, the excitation electrode is activated to inject a high-frequency pulse into the arc remnant, thereby improving the thermal recovery characteristics of the environmentally friendly insulating gas and suppressing the risk of current cutoff and reignition. S005. After the current crosses zero, the decomposition products of the environmentally friendly insulating gas are rapidly recombined at a lower temperature through the catalytic recombination unit.
[0027] The beneficial effects of this invention are as follows: By using a multi-stage nozzle to dissipate arc energy in stages and efficiently, while simultaneously utilizing a low-temperature environment created by a heat dissipation device to promote the recombination of decomposition products, the breaking capacity and dielectric recovery speed are simultaneously improved. By actively intervening in the current zero-crossing process through a high-frequency excitation electrode, the recovery process of the environmentally friendly gas dielectric strength better meets the requirements of circuit breaker breaking, fundamentally solving the problem of easy reignition caused by its poor non-equilibrium characteristics. The catalytic recombination unit solves the problem of poor recombination performance after environmentally friendly gas decomposition at the system level, reducing the gas degradation rate and improving the reliability and lifespan of the equipment. This invention can significantly improve the short-circuit current breaking capacity of circuit breakers using environmentally friendly insulating gases, enabling them to reach or approach the level of SF6 circuit breakers under the same conditions, and powerfully promoting the large-scale application of environmentally friendly gas high-voltage switchgear.
[0028] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be noted that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0029] It should be noted that the above embodiments are illustrative of this disclosure and not restrictive, and that alternative embodiments can be devised by those skilled in the art without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This disclosure can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems can be embodied by the same item of hardware.
[0030] Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose. The step numbers used in this specification are for distinguishing steps only and are not intended to limit the temporal or logical relationship between steps, and the relationship between steps includes a wide range of possibilities unless expressly defined herein.
[0031] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. An environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device, characterized in that, include: An arc-extinguishing chamber is used to house the stationary and moving contacts that generate the electric arc when the power is turned off. Multi-stage nozzles are arranged around the outside of the stationary contact and the moving contact to extinguish the electric arc using environmentally friendly insulating gas; A heat dissipation device is connected to the interior of the multi-stage nozzle to provide a low-temperature environment; The compressor chamber, connected to the multi-stage nozzle, is used to provide compressed environmentally friendly insulating gas; An excitation electrode, connected to the stationary contact, applies a reverse high-voltage pulse when the current inside the arc approaches zero, in order to suppress arc reignition. A catalytic composite unit is located inside the arc-extinguishing chamber, downstream of the multi-stage nozzle, and is used to composite the environmentally friendly insulating gas.
2. The environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device according to claim 1, characterized in that, The multi-stage nozzle includes an upstream nozzle and a downstream nozzle, which are respectively disposed outside the stationary contact and the moving contact. The upstream nozzle and the downstream nozzle are connected in series along the airflow direction of the compressor chamber, and are connected by a spiral channel.
3. The environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption method according to claim 2, characterized in that, The helical angle of the spiral channel is within a certain range.
4. The environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device according to claim 2, characterized in that, The upstream nozzle is made of high-temperature resistant ceramic or metal-ceramic composite material, and the inner wall of the downstream nozzle is smooth and made of high thermal conductivity metal.
5. The environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device according to claim 2, characterized in that, The bottom of the stationary contact is provided with a cooling wall in an annular shape. The cooling wall is connected to the bottom of the stationary contact and wraps the bottom of the stationary contact inside, forming a cavity-structured cooling chamber.
6. The environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device according to claim 5, characterized in that, The heat dissipation device is located outside the arc-extinguishing chamber. The environmentally friendly insulating gas non-equilibrium arc high-efficiency breaking device is equipped with a cooling channel. One end of the cooling channel is connected to the cooling chamber, and the other end of the cooling channel is connected to the heat dissipation device. The heat dissipation device provides a cooling medium to the cooling chamber through the cooling channel, and uses the cooling medium to accelerate the heat dissipation at the bottom of the stationary contact.
7. The environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device according to claim 6, characterized in that, The downstream nozzle is opposite to the opening of the cooling chamber, and is connected to the heat dissipation device through the cooling chamber to receive the cooling medium from the heat dissipation device.
8. The environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device according to claim 1, characterized in that, The excitation electrode is connected to a pulse power source, which provides a high-voltage pulse to the excitation electrode and transmits it to the stationary contact.
9. The environmentally friendly insulating gas non-equilibrium state arc high-efficiency interruption device according to claim 1, characterized in that, The catalytic composite unit is internally filled with porous materials and catalysts to promote the recombination of the decomposition products of the environmentally friendly insulating gas during the arc extinguishing process.
10. A method for efficient interruption of non-equilibrium arc in environmentally friendly insulating gas according to any one of claims 1-9, characterized in that, Includes the following steps, When the circuit is broken, an electric arc is generated between the moving and stationary contacts. The air chamber compresses the environmentally friendly insulating gas, generating a high-speed airflow that passes through a multi-stage nozzle to extinguish the electric arc. High-speed airflow drives the electric arc into the upstream nozzle, achieving initial cooling and confinement of the electric arc, reducing the ablation of the multi-stage nozzle, stationary contact and moving contact by the electric arc, and suppressing the disorderly decomposition of environmentally friendly insulating gas; The arc gas flow enters the downstream nozzle and is kept at a low temperature by the heat dissipation device, creating a low-temperature environment for the compounding of the decomposition products of the environmentally friendly insulating gas; and it greatly increases the airflow velocity, effectively increasing the pressure difference, which is beneficial for breaking. When the current inside the arc approaches zero, the excitation electrode is activated to inject a high-frequency pulse into the arc remnant, thereby improving the thermal recovery characteristics of the environmentally friendly insulating gas and suppressing the risk of current cutoff and reignition. After the current crosses zero, the decomposition products of the environmentally friendly insulating gas rapidly recombine at a lower temperature through the catalytic recombination unit.