CN112283578A - Recovery method and system based on sulfur hexafluoride gas recovery device - Google Patents
Recovery method and system based on sulfur hexafluoride gas recovery device Download PDFInfo
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- CN112283578A CN112283578A CN202011271172.4A CN202011271172A CN112283578A CN 112283578 A CN112283578 A CN 112283578A CN 202011271172 A CN202011271172 A CN 202011271172A CN 112283578 A CN112283578 A CN 112283578A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/002—Automated filling apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/023—Special adaptations of indicating, measuring, or monitoring equipment having the mass as the parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
- F17C13/045—Automatic change-over switching assembly for bottled gas systems with two (or more) gas containers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
- F17C13/123—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures for gas bottles, cylinders or reservoirs for tank vehicles or for railway tank wagons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/02—Improving properties related to fluid or fluid transfer
- F17C2260/022—Avoiding overfilling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/035—Dealing with losses of fluid
- F17C2260/036—Avoiding leaks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/04—Reducing risks and environmental impact
- F17C2260/044—Avoiding pollution or contamination
Abstract
The invention discloses a recovery method and a recovery system based on a sulfur hexafluoride gas recovery device, wherein the recovery method comprises the following steps: sending a starting signal to an air compressor to form directional air flow in a loop; after the directional gas flows through the first gas electromagnetic valve, the loop spring safety valve, the loop storage bag, the second gas electromagnetic valve and the air compressor, the directional gas flows into a sulfur hexafluoride recovery steel cylinder based on the designation of the electronic control valve through the electronic control valve; receiving weight signals fed back by more than two weight sensors in real time; and if the weight signal fed back by one of the weight sensors is greater than the preset weight, sending a switching signal to the electric control valve to adjust a communication channel of the electric control valve, so that an output port of the communication channel is communicated to the sulfur hexafluoride recovery steel cylinder corresponding to the weight sensor of which the weight signal does not exceed the preset weight. According to the recovery method, when the storage capacity of the sulfur hexafluoride recovery steel cylinder reaches a certain value, the storage position of sulfur hexafluoride gas is automatically switched, and the recovery safety of the sulfur hexafluoride gas is improved.
Description
Technical Field
The invention relates to the field of electrician tools, in particular to a recovery method and a recovery system based on a sulfur hexafluoride gas recovery device.
Background
The pure sulfur hexafluoride gas is colorless, tasteless, non-combustible, good in chemical stability, free of influence on ecology, 2.5 times of electric strength of air, more than 100 times of arc extinguishing capacity of air, and widely applied to power distribution systems since the sixties of the twentieth century; however, sulfur hexafluoride gas is decomposed under the action of high-voltage electric arc, the decomposition product of the sulfur hexafluoride gas can become corrosive electrolyte after meeting water, and can cause damage and operation faults to certain materials in the electrical equipment, the power standard DL/T941-2005 sulfur hexafluoride quality standard for transformers in operation stipulates the sulfur hexafluoride gas use standard, and the detection of the sulfur hexafluoride gas quality is a necessary measure for maintaining the safe and stable operation of the sulfur hexafluoride equipment; in the process of sulfur hexafluoride gas detection test, the emission of sulfur hexafluoride gas is easy to pollute the environment, and even seriously threatens the potential safety hazard of the health of field workers.
In the process of a sulfur hexafluoride gas test experiment, because the discharge amount of sulfur hexafluoride gas is unclear, in the process of an actual test experiment, if the recovery amount of sulfur hexafluoride gas exceeds the storage amount of a sulfur hexafluoride recovery steel cylinder, overflow is generated, and potential safety hazards are generated.
Disclosure of Invention
In order to avoid overflow leakage caused by excessive recovered sulfur hexafluoride gas, the invention provides a recovery method based on a sulfur hexafluoride gas recovery device.
Correspondingly, the invention provides a recovery method based on a sulfur hexafluoride gas recovery device, which comprises the following steps:
sending a starting signal to an air compressor to form directional air flow in a loop;
after the directional gas flows through the first gas electromagnetic valve, the loop spring safety valve, the loop storage bag, the second gas electromagnetic valve and the air compressor, the directional gas flows into a sulfur hexafluoride recovery steel cylinder specified based on the electric control valve through the electric control valve;
receiving weight signals fed back by more than two weight sensors in real time;
and if the weight signal fed back by one of the weight sensors is greater than the preset weight, sending a switching signal to the electric control valve to adjust a communication channel of the electric control valve, so that an output port of the communication channel is communicated to the sulfur hexafluoride recovery steel cylinder corresponding to the weight sensor of which the weight signal does not exceed the preset weight.
In an alternative embodiment, the pressure relief port of the circuit spring relief valve is connected to an overflow reservoir bag based on an overflow spring relief valve, the overflow reservoir bag is connected to the circuit reservoir bag based on a third gas solenoid valve, and the recovery method further comprises:
when the first gas electromagnetic valve and the second gas electromagnetic valve are in a conducting state, the third gas electromagnetic valve is in a conducting state;
and when the first gas electromagnetic valve or the second gas electromagnetic valve is in a cut-off state, the third gas electromagnetic valve is in a cut-off state.
In an optional embodiment, a pressure sensor is arranged outside the overflow storage bag;
and when the pressure value of the pressure sensor is greater than a certain value, the third gas electromagnetic valve is switched from a cut-off state to a conducting state.
In an alternative embodiment, the first gas solenoid valve is switched from the on state to the off state at the same time as the third gas solenoid valve is switched from the off state to the on state.
In an alternative embodiment, the recovery unit further comprises a filter interposed between the recovery unit inlet port and the return spring relief valve.
In an alternative embodiment, the second gas solenoid valve is switched from the on state to the off state when the weight signals fed back by all the weight sensors exceed a preset weight.
In an optional implementation manner, a flow sensor is further connected between the air compressor and the machine interface of the compression unit;
and when the flow of the flow sensor is lower than a preset flow value, the air compressor stops running.
Correspondingly, the invention provides a recovery system based on a sulfur hexafluoride gas recovery device, which is used for realizing any recovery method based on the sulfur hexafluoride gas recovery device.
In conclusion, the invention provides the sulfur hexafluoride gas recovery device, which can effectively recover sulfur hexafluoride gas and ensure the safety of workers.
The invention provides a recovery method and a recovery system based on a sulfur hexafluoride gas recovery device, which can automatically switch the storage position of sulfur hexafluoride gas when the storage amount of a sulfur hexafluoride recovery steel cylinder reaches a certain value, thereby improving the recovery safety of sulfur hexafluoride gas.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of a sulfur hexafluoride gas recovery device according to an embodiment of the present invention;
fig. 2 shows a recovery method based on a sulfur hexafluoride gas recovery device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Fig. 1 shows a schematic structural diagram of a sulfur hexafluoride gas recovery device according to an embodiment of the present invention. Correspondingly, the invention provides a sulfur hexafluoride gas recovery device, which comprises a recovery unit, a compression unit and a collection unit;
the recovery unit comprises a recovery unit air inlet interface, a loop spring safety valve and a loop storage bag;
the compression unit comprises a compression unit air inlet interface, an air compressor and a compression unit air outlet interface;
the collecting unit comprises a sulfur hexafluoride recovery steel cylinder;
the recovery unit air inlet interface, the loop spring safety valve, the loop storage bag, the compression unit air inlet interface, the air compressor, the compression unit air outlet interface and the sulfur hexafluoride recovery steel cylinder are sequentially connected.
The sulfur hexafluoride gas recovery device actively absorbs the waste containing sulfur hexafluoride gas under the driving of the air compressor, and then recovers the waste into a sulfur hexafluoride recovery steel cylinder after temporary storage (improving the stability of suction pressure) is carried out through the loop storage bag.
In an optional implementation mode, the sulfur hexafluoride gas recovery device further comprises a main control panel and a touch screen; the main control panel is electrically connected with the touch screen. The main control board and the touch screen are arranged, and the sulfur hexafluoride gas recovery device can be controlled and monitored by corresponding matched electronic equipment and monitoring equipment.
In an alternative embodiment, the recovery unit further comprises a filter interposed between the recovery unit inlet port and the return spring relief valve. The filter can filter out large-particle-size particles mixed in the gas, so that pipelines are prevented from being blocked and sulfur hexafluoride gas recovery is prevented from being influenced.
In an optional embodiment, the recovery unit further comprises a first gas solenoid valve interposed between the filter and the spring relief valve; the first gas solenoid valve is electrically connected with the main control board. The first gas solenoid valve is mainly used for controlling the introduction of waste gas into the recovery unit.
In an optional embodiment, the recycling unit further comprises a second gas solenoid valve, and the second gas solenoid valve is connected between the loop storage bag and the compression unit gas outlet interface; the second gas solenoid valve is electrically connected with the main control board. The second gas solenoid valve is mainly used for controlling the exhaust and recovery unit of the waste gas.
In an alternative embodiment, the circuit spring relief valve has a pressure relief port; the sulfur hexafluoride gas recovery device further comprises an overflow spring safety valve and an overflow storage bag, and the overflow storage bag is connected with the pressure relief opening based on the spring safety valve. When the air pressure of the loop storage bag is too high, in order to prevent the loop storage bag from being broken, the pressure is released through a loop spring safety valve. Specifically, after the pressure relief, the storage bag is overflowed to carry out secondary storage, so that leakage is prevented.
In an optional implementation manner, a pressure sensor is arranged outside the overflow storage bag, and the pressure sensor is connected with the main control board. Specifically, the pressure sensor is used for sensing the expansion condition of the overflowing storage bag and judging whether active pressure relief is needed or not.
In an alternative embodiment, the spill reservoir bag is connected to the return reservoir bag based on a third gas solenoid valve. Specifically, the active pressure relief mode is controlled by a third gas solenoid valve, and when the pressure of the loop storage bag is normal, the waste overflowing the storage bag can be sent back to the main loop by opening the third gas solenoid valve.
In an alternative embodiment, the overflow spring safety valve has a pressure relief opening, the pressure relief opening of the overflow spring safety valve opening into the absorption solution. Further, when overflowing the storage bag and being full-load, carry out the pressure release through overflowing the spring relief valve, abandonment directly gets into absorption solution and reacts after the pressure release, no longer reuse.
In an optional implementation mode, the number of the sulfur hexafluoride recovery steel cylinders is more than two, and the more than two sulfur hexafluoride recovery steel cylinders are switched based on an electric control valve; in the same time, one sulfur hexafluoride recovery steel cylinder of more than two sulfur hexafluoride recovery steel cylinders is connected with the gas outlet interface of the compression unit based on the electric control valve; any one of the sulfur hexafluoride recovery steel cylinders is correspondingly provided with a weight sensor, and all the weight sensors and the electric control valves are respectively connected with the main control board. Specifically, based on the feedback of the weight sensor, when the weight of the sulfur hexafluoride recovery steel cylinder reaches a certain value, the control of the electric control valve can be switched through the main control board.
Furthermore, in the switching of the on state and the off state of the first gas solenoid valve, the second gas solenoid valve and the third gas solenoid valve, there may be a case that the loop is off, and in order to avoid the failure of the air compressor under the condition that the loop is off, in the embodiment of the present invention, a flow sensor is connected between the air compressor and the air inlet interface of the compressor unit, and the flow sensor is connected with the main control board. When the feedback flow of the flow sensor is lower than the preset flow value, the air compressor stops running until the main control board restarts the air compressor.
Fig. 2 shows a recovery method based on a sulfur hexafluoride gas recovery device in an embodiment of the present invention, and correspondingly, an embodiment of the present invention further provides a recovery method based on a sulfur hexafluoride gas recovery device, which is implemented based on the sulfur hexafluoride gas recovery device, and includes:
s101, sending a starting signal to an air compressor to form directional airflow in a loop;
specifically, after flowing through a first gas electromagnetic valve, a loop spring safety valve, a loop storage bag, a second gas electromagnetic valve and an air compressor, directional gas flows into a sulfur hexafluoride recovery steel cylinder specified based on the electronic control valve through the electronic control valve;
specifically, the circuit refers to a main circuit for recovering exhaust gas.
S102: receiving weight signals fed back by more than two weight sensors in real time;
specifically, the weight sensors and the sulfur hexafluoride recovery steel cylinders are arranged in a one-to-one correspondence manner, and the recovery condition of the sulfur hexafluoride recovery steel cylinders to sulfur hexafluoride gas can be determined based on the weight sensors.
S103, if the weight signal fed back by one of the weight sensors is larger than the preset weight, sending a switching signal to the electric control valve to adjust a communicating channel of the electric control valve, so that an output port of the communicating channel is communicated to a sulfur hexafluoride recovery steel cylinder corresponding to the weight sensor of which the weight signal does not exceed the preset weight.
Through the control to the electric control valve, the communicating channel inside the electric control valve is switched, so that the sulfur hexafluoride recovery steel cylinder used in the process of recovering gas is switched, and the phenomenon that the sulfur hexafluoride gas overflows due to the fact that the storage capacity of the sulfur hexafluoride recovery steel cylinder is full is avoided.
Furthermore, the on-off control of the first gas electromagnetic valve, the second gas electromagnetic valve and the third gas electromagnetic valve is involved in the recovery process of the sulfur hexafluoride gas.
Specifically, when the sulfur hexafluoride gas recovery device operates normally, the first gas solenoid valve and the second gas solenoid valve are in a conducting state, and the loop is conducted.
When the weight signals of all the weight sensors are larger than the preset weight, in order to avoid continuously sucking waste, closing the second gas electromagnetic valve, and switching the second gas electromagnetic valve into a cut-off state; waste gas (without the action of an air compressor, the flow rate is slow) slowly fills the loop storage bag and overflows to the overflow storage bag until the overflow storage bag is fully loaded and then is decompressed to the absorption solution.
If the weight signal of at least one weight sensor is lower than the preset weight, the second gas electromagnetic valve is switched to the conduction state again, and the loop is conducted again; and under the condition that the loop is conducted, judging the storage condition of the overflow storage bag based on the pressure sensor, switching the third gas electromagnetic valve to a conducting state if the pressure value of the pressure sensor is greater than a certain value, and extruding the gas into the loop through the third gas electromagnetic valve by the contraction characteristic of the overflow storage bag.
When absorption solution needs to be supplemented, the first gas electromagnetic valve needs to be closed, so that waste gas is prevented from entering the recovery device, and the waste gas pollution to the device is avoided.
Correspondingly, the embodiment of the invention also provides a recovery system based on the sulfur hexafluoride gas recovery device, which is used for realizing any recovery method based on the sulfur hexafluoride gas recovery device.
In summary, the embodiment of the invention provides a recovery method and a recovery system based on a sulfur hexafluoride gas recovery device, and the recovery method and the recovery system automatically switch the storage position of sulfur hexafluoride gas when the storage capacity of a sulfur hexafluoride recovery steel cylinder reaches a certain value, so as to improve the recovery safety of sulfur hexafluoride gas.
The recovery method and system based on the sulfur hexafluoride gas recovery device provided by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A recovery method based on a sulfur hexafluoride gas recovery device is characterized by comprising the following steps:
sending a starting signal to an air compressor to form directional air flow in a loop;
after the directional gas flows through the first gas electromagnetic valve, the loop spring safety valve, the loop storage bag, the second gas electromagnetic valve and the air compressor, the directional gas flows into a sulfur hexafluoride recovery steel cylinder specified based on the electric control valve through the electric control valve;
receiving weight signals fed back by more than two weight sensors in real time;
and if the weight signal fed back by one of the weight sensors is greater than the preset weight, sending a switching signal to the electric control valve to adjust a communication channel of the electric control valve, so that an output port of the communication channel is communicated to the sulfur hexafluoride recovery steel cylinder corresponding to the weight sensor of which the weight signal does not exceed the preset weight.
2. The recovery method for sulfur hexafluoride gas based recovery apparatus of claim 1, wherein said pressure relief port of said circuit spring relief valve is connected to an overflow storage bag based on an overflow spring relief valve, said overflow storage bag is connected to said circuit storage bag based on a third gas solenoid valve, said recovery method further comprising:
when the first gas electromagnetic valve and the second gas electromagnetic valve are in a conducting state, the third gas electromagnetic valve is in a conducting state;
and when the first gas electromagnetic valve or the second gas electromagnetic valve is in a cut-off state, the third gas electromagnetic valve is in a cut-off state.
3. The recovery method based on sulfur hexafluoride gas recovery device according to claim 2, wherein a pressure sensor is provided outside the overflow storage bag;
and when the pressure value of the pressure sensor is greater than a certain value, the third gas electromagnetic valve is switched from a cut-off state to a conducting state.
4. The recovery method based on sulfur hexafluoride gas recovery device according to claim 3, wherein said first gas solenoid valve is switched from an on state to an off state at the same time as said third gas solenoid valve is switched from an off state to an on state.
5. The sulfur hexafluoride gas recovery device-based recovery method of claim 2, wherein said recovery unit further includes a filter interposed between said recovery unit gas inlet port and a return spring relief valve.
6. The recovery method based on sulfur hexafluoride gas recovery apparatus as claimed in claim 1, wherein said second gas solenoid valve is switched from an on state to an off state when the weight signals fed back from all the weight sensors exceed a preset weight.
7. The recovery method based on sulfur hexafluoride gas recovery device according to claim 1, wherein a flow sensor is further connected between the air compressor and the compression unit machine interface;
and when the flow of the flow sensor is lower than a preset flow value, the air compressor stops running.
8. A recovery system based on a sulfur hexafluoride gas recovery device, characterized by being used for implementing the recovery method based on the sulfur hexafluoride gas recovery device as claimed in any one of claims 1 to 7.
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| CN202011271172.4A CN112283578A (en) | 2020-11-13 | 2020-11-13 | Recovery method and system based on sulfur hexafluoride gas recovery device |
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| CN202011271172.4A CN112283578A (en) | 2020-11-13 | 2020-11-13 | Recovery method and system based on sulfur hexafluoride gas recovery device |
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| CN112283578A true CN112283578A (en) | 2021-01-29 |
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Cited By (1)
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| CN114719182A (en) * | 2022-04-24 | 2022-07-08 | 国家电网有限公司 | Air supplementing device and method for sulfur hexafluoride electrical equipment |
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