CN208477412U - A kind of making-up air device of SF6 electrical equipment - Google Patents
A kind of making-up air device of SF6 electrical equipment Download PDFInfo
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- CN208477412U CN208477412U CN201821017803.8U CN201821017803U CN208477412U CN 208477412 U CN208477412 U CN 208477412U CN 201821017803 U CN201821017803 U CN 201821017803U CN 208477412 U CN208477412 U CN 208477412U
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Abstract
The utility model discloses a kind of making-up air device of SF6 electrical equipment, and the making-up air device includes: SF6 gas cylinder, connection tracheae, control valve, first pressure sensor, temperature sensor and control processing unit；One end of connection tracheae is sealedly attached on the gas supplementing opening of SF6 electrical equipment, and the other end for connecting tracheae is sealedly attached on the inflating port of making-up air device；First pressure sensor is set between gas supplementing opening and control valve, and for measuring gas temperature, control valve is set between inflating port and SF6 gas cylinder temperature sensor, and control processing unit is connect with first pressure sensor, temperature sensor and control valve respectively.The temperature value of pressure value and temperature sensor acquisition that the utility model is acquired according to first pressure sensor, obtain the gas density value of SF6 electrical equipment, and according to the opening and closing of gas density value and the relationship of preset value control control valve, without having a power failure or online tonifying Qi can be carried out to high-tension switch gear to scene.
Description
Technical field
The utility model relates to electrical equipments, more particularly to a kind of making-up air device of SF6 electrical equipment.
Background technique
SF6 gas is obtained extensively as insulation and arc-extinguishing medium in the electrical apparatus due to brilliant insulation and arc extinction performance
General application.Currently, SF6 electrical equipment is widely applied in power department, industrial and mining enterprises, the fast development of power industry is promoted.
With rapid economic development, China's power system capacity sharply expands, and in recent years, SF6 electrical equipment consumption further increases.
The effect of SF6 gas in the electrical apparatus is arc extinguishing and insulation, and still, in high voltage electric equipment density, which reduces, (such as leaks and draw
Rise) electric property that will seriously affect SF6 high-tension apparatus, causes hidden trouble to safe operation.In order to guarantee SF6 electrical equipment
Reliability service, improve the continuous reliability service ability of electric system, it is necessary in time to SF6 electrical equipment carry out tonifying Qi.Work as
We monitor or find the slight gas leakage of certain SF6 electrical equipment when detecting, and do not have interruption maintenance plan at this time, or not
It can have a power failure immediately and be overhauled, then we must carry out tonifying Qi to the SF6 electrical equipment of the slight gas leakage of this, keep its gas close
Degree is maintained at certain level, reaches safe operating conditions, we can not arrange immediately interruption maintenance, and be able to extend
The reliable continuous operation ability of SF6 electrical equipment, can also especially make equipment safety operation when cannot have a power failure.And it is right
For SF6 electrical equipment, insulation or arc extinction performance of the density value of SF6 gas concerning SF6 electrical equipment, to SF6 gas
Density value horizontal processing, is of great significance.Tonifying Qi, mesh are carried out to the SF6 electrical equipment for the slight gas leakage that cannot have a power failure immediately
Preceding substation be much it is unwatched, this just needs personnel to go field conduct tonifying Qi, but due to substation be all outdoors,
Operations staff frequently goes to be unpractical, furthermore just needs more personnel that scene is gone to need vehicle first, undoubtedly can in this way
Increase very big operating cost.
Utility model content
The purpose of the utility model is to provide a kind of making-up air device of SF6 electrical equipment, realize to SF6 electrical equipment from
Dynamic, timely tonifying Qi guarantees that the safe operation of SF6 electrical equipment can substantially reduce operation expense again simultaneously.Especially realize
Online tonifying Qi improves power grid reliably working.
To achieve the above object, the utility model provides following scheme:
A kind of making-up air device of SF6 electrical equipment, the making-up air device include:
SF6 gas cylinder, connection tracheae, control valve, first pressure sensor, temperature sensor and control processing unit；
One end of the connection tracheae is sealedly attached on the gas supplementing opening of SF6 electrical equipment, described to connect the another of tracheae
End is sealedly attached on the inflating port of the making-up air device, and the first pressure sensor is set to the gas supplementing opening and the control
Between valve processed, for the temperature sensor for measuring gas temperature, the control valve is set to the inflating port and the SF6 gas
Between bottle, the control processing unit connects with the first pressure sensor, the temperature sensor and the control valve respectively
It connects；
The pressure value and the temperature sensor that the control processing unit is acquired according to the first pressure sensor are adopted
The temperature value of collection obtains the gas density value of SF6 electrical equipment, described when the gas density value is less than the first preset value
It controls processing unit and controls the control valve unlatching, when the gas density value is greater than the second preset value, the control processing
Device controls the control valve and closes, and second preset value is greater than first preset value.
Optionally, the making-up air device includes: second pressure sensor, and the second pressure sensor is set to described
Between SF6 gas cylinder and the control valve, and the second pressure sensor is connect with the control processing unit.
Optionally, the making-up air device further include: flow controller, the flow controller are set to the SF6 gas cylinder
Between the control valve, the control processing unit indirectly controls flow of air supply by controlling the flow controller.
Optionally, the connection tracheae contains Self-sealing valve.
Optionally, the making-up air device further include: exhaust gear, the exhaust gear are set to the inflating port and described
On tracheae between control valve, for discharging the air in making-up air device, the pressure adjustable of the exhaust gear.
Optionally, the exhaust gear is to adjust cylinder, and the adjusting cylinder is provided with piston, and piston is connected with an adjusting
Bar, adjusting rod outer end are equipped with handwheel, drive the adjusting rod to drive the piston in the tune by rotating the handwheel
It is moved in section cylinder, realizes the discharge of air.
Optionally, the exhaust gear includes: vacuum pump, vacuum valve and safety valve, the vacuum pump, the vacuum valve and
The safety valve is sequentially connected with, wherein one end of the safety valve is connected to the gas between the inflating port and the control valve
Guan Shang, the other end of the safety valve connect one end of the vacuum valve, and the other end of the vacuum valve and the vacuum pump connect
It connects.
Optionally, the making-up air device further include: heater, the heater are mounted on SF6 gas cylinder bottom or week
It encloses.
Optionally, the making-up air device further include: pressure reducing valve, the pressure reducing valve are connected to the gas outlet of the SF6 gas cylinder
On.
Optionally, the control valve is the valve of solenoid valve or Electronic control.
According to specific embodiment provided by the utility model, the utility model discloses following technical effects:
The temperature value that the utility model can be acquired according to the pressure value and temperature sensor that first pressure sensor acquires,
Obtain the gas density value of SF6 electrical equipment, and according to the unlatching of gas density value and the relationship of preset value control control valve and
It closes, without having a power failure or online tonifying Qi can be carried out to high-tension switch gear to scene.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without any creative labor, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structure connection figure of the making-up air device of the utility model SF6 electrical equipment；
Fig. 2 is the connection figure that the utility model controls processing unit and other structures.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
The purpose of the utility model is to provide a kind of making-up air device of SF6 electrical equipment, realize to SF6 electrical equipment from
Dynamic, timely tonifying Qi guarantees that the safe operation of SF6 electrical equipment can substantially reduce operation expense again simultaneously.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
Fig. 1 is the structure connection figure of the making-up air device of the utility model SF6 electrical equipment, as shown in Figure 1, the SF6 is electric
The making-up air device of gas equipment includes shell 4, SF6 gas cylinder 3, connection tracheae 19, control valve 10, inflating port 18, first pressure sensing
Device 21, second pressure sensor 9, the first temperature sensor 20, second temperature sensor 8, control processing unit 25.
Described 19 one end of connection tracheae is sealedly connected on the gas supplementing opening of SF6 electrical equipment 24, and connection tracheae 19 is another
End is sealedly connected on the inflating port 18 of making-up air device.First pressure sensor 21, second pressure sensor 9, the first temperature pass
Sensor 20, second temperature sensor 8 are connected with control processing unit 25.Processing unit 25 is controlled according to first pressure sensor
21 and first temperature sensor 20 pressure value and the pressure-temperature characteristic relation of temperature value and SF6 gas carry out at data
Reason, obtain corresponding 20 DEG C of pressure values, i.e. gas density value, it is specific as follows: the measurement of 20 DEG C of pressure values (density value) mainly by
Pressure sensor and temperature sensor utilize the mathematics of relationship between SF6 gas pressure and temperature by controlling processing unit 25
Model, using the method for hard measurement, the calculation process by controlling processing unit 25 obtains the density value of SF6 gas.Specifically
Process is to be solved according to SF6 gas density is curvilinear equation (BETTY BOOP-Bridgeman equation), the equation is:
Wherein, ρ is density, and unit is kg/m3, and T is temperature, and unit K (Kelvin), P is absolute pressure, unit MPa.
After measurement obtains temperature and pressure value, using above-mentioned relation formula, density, the unique solution of ρ, it can know it can be obtained
Corresponding 20 DEG C of pressure values (density value).
The gas density value of SF6 electrical equipment can be constantly monitored in this way.When SF6 electrical equipment leaks air, gas
When volume density drops to certain value P1, control processing unit 25 is switched on control valve 10, and the SF6 gas on SF6 gas cylinder 3 will
By connecting in 19 tonifying Qi of tracheae to the inner plenum of SF6 electrical equipment 24, when the gas density of SF6 electrical equipment 24 reaches institute
It is required that setting density value P2 when, control processing unit 25 be shut off control valve 10, the SF6 gas on gas cylinder 3 just stops to SF6
24 tonifying Qi of electrical equipment.Thus online tonifying Qi can be realized automatically to SF6 electrical equipment 24, it is ensured that the gas of SF6 electrical equipment
Volume density is on level of security.First temperature sensor 20 is arranged in inside the gas circuit on making-up air device, or setting is even
Inside the gas circuit of trachea 19, or it is arranged on making-up air device；Gas temperature can be measured, or is measured in practical engineering application
Environment temperature is equal to gas temperature.
The utility model also sets up second pressure sensor 9, second temperature sensor 8, is set to SF6 gas cylinder 3 and control
Between valve 10, it is used for acquisition control valve rear end pressure and temperature, thus the density of SF6 gas cylinder 3.Second temperature sensor 8 is arranged
Inside gas circuit on making-up air device, or it is arranged on making-up air device；It is also possible to measure gas temperature, or in Practical Project
It is equal to gas temperature using upper measurement environment temperature.
In order to more accurately carry out gas flow control, the utility model is also additionally arranged a flow controller 7, flows
Amount controller 7 with control processing unit 25 be connected, can control the flow of tonifying Qi, require supplementation with gas it is more when, Ke Yizeng
Add flow, and require supplementation with gas it is a small amount of when, it is possible to reduce gas flow.
Exhaust gear on the intellectual online making-up air device of SF6 electrical equipment is connected on valve 12.Exhaust gear setting
On tracheae between inflating port and control valve 10, for discharging the air in making-up air device, the pressure adjustable of exhaust gear.
As shown in Figure 1, exhaust gear includes vacuum pump 16, vacuum valve 15, vacuum sensor 13, safety valve 14, realize
Discharge to the air inside connection tracheae 19 etc., it is ensured that no impurity, moisture enter inside SF6 electrical equipment 24.Vacuum degree
Sensor 13, safety valve 14 can also be substituted directly by vacuum meter.In addition the exhaust gear may be the exhaust of pressure adjustable
Mechanism, it can including an adjusting cylinder, adjust cylinder and be provided with piston, piston is connected with an adjusting rod, adjusting rod outer end dress
There is handwheel, drives adjusting rod to move in adjusting cylinder with piston by rotation handwheel, realize to online making-up air device gas
The discharge of the internal air such as pipe.Wherein, vacuum valve 15 can not also use；Even safety valve 14 can also save.
Making-up air device provided by the utility model further includes heater 2, and heater 2 is mounted on 3 bottom of SF6 gas cylinder, low
When temperature or gas surplus are a small amount of, 3 pressure rise of SF6 gas cylinder can be made with heater 2, so that gas is more easier to add to
In equipment, while also not wasting gas.Pressure reducing valve 5 is connected on the gas outlet of SF6 gas cylinder 3, can control the flow of gas.
The utility model adds built-in power 17, and built-in power 17 can control the operation of making-up air device.Device can also be with
External connection power supply.The setting of filtration core 22 is on connection tracheae 19, it is ensured that it is clean for covering to the gas of SF6 electrical equipment.
In addition it can also go out gas side in SF6 gas cylinder 3 and increase filtration core 6.Connecting 19 both ends of tracheae contains Self-sealing valve simultaneously, it is ensured that connection gas
The seal of tube guarantees that gas is clean.Contain several wheels 1 on the shell 4 of the intellectual online making-up air device of SF6 electrical equipment, it can be with
It is moved easily.Rain shade 26 is also set up on shell.
Control valve 10 is the valve of solenoid valve, Electronic control.Such as the various valves of manipulator control can be passed through.
Fig. 2 is the connection figure that the utility model controls processing unit and other structures.As shown in Fig. 2, control processing unit
25 respectively with first pressure sensor 21, second pressure sensor 9, the first temperature sensor 20, second temperature sensor 8, control
Valve 10 processed, flow controller 7, vacuum sensor 13, vacuum pump 16, heater 2 connect.
In addition to this, control processing unit 25 also contains signal communication unit functional module and human-machine interface function module,
It can mutually be communicated with specified mobile phone or computer, operations staff can grasp tonifying Qi information, gas cylinder in time by mobile phone
Gas pressure information, SF6 inside electric appliance density value information.Operations staff can modify online making-up air device by mobile phone and set
Fixed parameter.
In addition, the utility model further includes micro- water sensor, micro- water sensor is connected with control processing unit 25, can be with
The gas micro water content for monitoring SF6 electrical equipment or online making-up air device can alarm when water content is exceeded.It further include point
Object sensor is solved, decomposition product sensor is connected with control processing unit 25, can monitor SF6 electrical equipment or online tonifying Qi dress
The gas decomposition product content set can alarm when content is exceeded.It controls processing unit 25 and passes through display (man-machine interface) just
Ground directly displays dew point value (micro-water content), density value, temperature value, meanwhile, it is linked by data communication methods such as RS-485
In comprehensive automation system of transformer substation, and teletransmission is to unattended station central monitoring station, at the center of substation locality and a distant place
Monitoring station carries out real-time monitoring, realizes the on-line monitoring of SF6 gas density is and micro- water in SF6 electrical equipment.
The application method of the making-up air device of the SF6 electrical equipment of the utility model is as follows:
Step 1: opening the valve 12 being connected with vacuum pump 16, and then by opening vacuum pump 16, connection tracheae is taken out
It is vacuum-treated.
Step 2: after the completion of connecting 19 vacuumize process of tracheae, valve 12 is closed, then connection tracheae 19 is sealed and is connected
It connects on the gas supplementing opening 23 of SF6 electrical equipment 24, Open valve 11.
Step 3: processing unit 25 is controlled according to the pressure value of first pressure sensor 21 and the first temperature sensor 20
And the pressure-temperature characteristic relation progress data processing of temperature value and SF6 gas, obtain corresponding 20 DEG C of pressure value (density
Value), constantly monitor the gas density value of SF6 electrical equipment 24.
Step 4: when SF6 electrical equipment leaks air, when gas density drops to certain value P1, control processing dress
It sets 25 and is switched on control valve 10, the SF6 gas on SF6 gas cylinder 3 will pass through connection 19 tonifying Qi of tracheae to SF6 electrical equipment 24
In inner plenum.
Step 5: when the gas density of SF6 electrical equipment 24 reaches required setting density value P2, control processing dress
It sets 25 and is shut off control valve, the SF6 gas on SF6 gas cylinder just stops to SF6 electrical equipment tonifying Qi.It thus can be to SF6 electricity
Gas equipment realizes online tonifying Qi automatically, it is ensured that the gas density of SF6 electrical equipment is on level of security.
Step 6: operations staff can be grasped in time by mobile phone or computer tonifying Qi information, cylinder gas pressure information,
SF6 inside electric appliance density value information.Or operations staff can modify online making-up air device setting by mobile phone or computer
Parameter.
In short, when SF6 electrical equipment leaks air, when gas density drops to certain value P1, online making-up air device
Just give the tonifying Qi of SF6 electrical equipment.And when the gas density of SF6 electrical equipment reaches required setting density value P2, it is described
Making-up air device just stops to SF6 electrical equipment tonifying Qi.So recycled repeatedly, it thus can be automatic to SF6 electrical equipment
Realize online tonifying Qi, it is ensured that the gas density of SF6 electrical equipment is on level of security.
At the scene in use, being connected on one end of SF6 gas connection tracheae 19 and the gas supplementing opening of SF6 electrical equipment 24
It connects, the other end of SF6 gas connection tracheae 19 is connected with the equipment connection port outside the valve 11 on online making-up air device.
It is inflated after hours when online, closes valve 11, while valve 12 is also to close, and disengages and connects tracheae 19 just
It can be with.Online making-up air device can be moved to other place.
Following positive effect will be generated by the utility model technical application:
1) without having a power failure or can the online tonifying Qi of carry out to high-tension switch gear to scene.
2) the online tonifying Qi for realizing SF6 electrical equipment, meets the needs of grid automation and equipment state overhauling, to raising
The safe operation of system and operation and management level carry out expected diagnosis and trend analysis, reduce and play weight without scheduled outage maintenance
It acts on.And the time between overhauls(TBO) for extending corresponding SF6 electrical equipment is pushed, it, can to improve the continuous reliability service ability of electric system
To greatly improve the safe operation of power grid.
3) power off time is reduced, is improved service quality.
4) accomplish planned interruption maintenance, reduce and surprisingly need interruption maintenance event, maintenance, dimension can be substantially reduced in this way
Shield expense.The passive work for reducing work about electric power personnel, accomplishes planned work, improves efficiency, and improves initiative, can save
A large amount of human and material resources improve operation of power networks efficiency, thus both directly and indirectly generate good economic benefit.
5) ensureing can need on power supply quality, especially material time node (such as during two Conferences) to avoid because of excessive water content
Have a power failure, there is good social benefit.
The technology of the present invention can improve the operating maintenance period of high-tension switch gear in time in a word, while can also be a large amount of
It reduces using artificial, regular inspection expense, reduces previous power off time, workload, reduce the operation of maintenance bring and old work
Program bring insecurity factor saves human and material resources, financial resources, achievees the purpose that volume increase, synergy, safety, improves power quality
And the reliability of power supply, to obtain good economic benefit and social benefit.In addition power supply quality is ensured, it is especially important
It can need to have a power failure to avoid because of the decline of gas leakage density (such as during two Conferences) on timing node, reduce power off time, improve service
Quality has important social benefit.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Specific case used herein is expounded the principles of the present invention and embodiment, above embodiments
Explanation be merely used to help understand the method and its core concept of the utility model；Meanwhile for the general technology of this field
Personnel, based on the idea of the present invention, there will be changes in the specific implementation manner and application range.In conclusion
The content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. a kind of making-up air device of SF6 electrical equipment, which is characterized in that the making-up air device includes:
SF6 gas cylinder, connection tracheae, control valve, first pressure sensor, temperature sensor and control processing unit；
One end of the connection tracheae is sealedly attached on the gas supplementing opening of SF6 electrical equipment, and the other end of the connection tracheae is close
Envelope is connected on the inflating port of the making-up air device；The first pressure sensor is set to the gas supplementing opening and the control valve
Between, the temperature sensor for measuring gas temperature, the control valve be set to the inflating port and the SF6 gas cylinder it
Between, the control processing unit is connect with the first pressure sensor, the temperature sensor and the control valve respectively；
What the pressure value and the temperature sensor that the control processing unit is acquired according to the first pressure sensor acquired
Temperature value obtains the gas density value of SF6 electrical equipment, when the gas density value is less than the first preset value, the control
Processing unit controls the control valve and opens, when the gas density value is greater than the second preset value, the control processing unit
It controls the control valve to close, second preset value is greater than first preset value.
2. making-up air device according to claim 1, which is characterized in that the making-up air device includes: second pressure sensor,
The second pressure sensor is set between the SF6 gas cylinder and the control valve, and the second pressure sensor is distinguished
It is connect with the control processing unit.
3. making-up air device according to claim 1, which is characterized in that the making-up air device further include: flow controller, institute
It states flow controller to be set between the SF6 gas cylinder and the control valve, the control processing unit is by controlling the stream
Amount controller indirectly controls flow of air supply.
4. making-up air device according to claim 1, which is characterized in that the connection tracheae contains Self-sealing valve.
5. making-up air device according to claim 1, which is characterized in that the making-up air device further include: exhaust gear, it is described
Exhaust gear is set on the tracheae between the inflating port and the control valve, for discharging the air in making-up air device, institute
State the pressure adjustable of exhaust gear.
6. making-up air device according to claim 5, which is characterized in that the exhaust gear is to adjust cylinder, the adjusting cylinder
It is provided with piston, piston is connected with an adjusting rod, and adjusting rod outer end is equipped with handwheel, drives the tune by rotating the handwheel
Pole drives the piston to move in the adjusting cylinder in turn, realizes the discharge of air.
7. making-up air device according to claim 5, which is characterized in that the exhaust gear include: vacuum pump, vacuum valve and
Safety valve, the vacuum pump, the vacuum valve and the safety valve are sequentially connected with, wherein one end of the safety valve is connected to
On tracheae between the inflating port and the control valve, the other end of the safety valve connects one end of the vacuum valve, institute
The other end for stating vacuum valve is connect with the vacuum pump.
8. making-up air device according to claim 1, which is characterized in that the making-up air device further include: heater, it is described to add
Hot device is mounted on SF6 gas cylinder bottom or surrounding.
9. making-up air device according to claim 1, which is characterized in that the making-up air device further include: pressure reducing valve, it is described to subtract
Pressure valve is connected on the gas outlet of the SF6 gas cylinder.
10. making-up air device according to claim 1, which is characterized in that the control valve is solenoid valve or Electronic control
Valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821017803.8U CN208477412U (en) | 2018-06-29 | 2018-06-29 | A kind of making-up air device of SF6 electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821017803.8U CN208477412U (en) | 2018-06-29 | 2018-06-29 | A kind of making-up air device of SF6 electrical equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594916A (en) * | 2018-06-29 | 2018-09-28 | 上海乐研电气有限公司 | A kind of making-up air device and supplementing method for air of SF6 electrical equipments |
| CN111359367A (en) * | 2020-03-16 | 2020-07-03 | 中北大学 | SF (sulfur hexafluoride)6Gas micro-water treatment device |
| CN112303488A (en) * | 2020-10-26 | 2021-02-02 | 广西电网有限责任公司电力科学研究院 | Novel constant-temperature electric heating quick inflation device for environment-friendly insulating medium |
| CN112652501A (en) * | 2020-11-26 | 2021-04-13 | 广西电网有限责任公司桂林供电局 | Sulfur hexafluoride air interchanger |
-
2018
- 2018-06-29 CN CN201821017803.8U patent/CN208477412U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594916A (en) * | 2018-06-29 | 2018-09-28 | 上海乐研电气有限公司 | A kind of making-up air device and supplementing method for air of SF6 electrical equipments |
| CN111359367A (en) * | 2020-03-16 | 2020-07-03 | 中北大学 | SF (sulfur hexafluoride)6Gas micro-water treatment device |
| CN112303488A (en) * | 2020-10-26 | 2021-02-02 | 广西电网有限责任公司电力科学研究院 | Novel constant-temperature electric heating quick inflation device for environment-friendly insulating medium |
| CN112652501A (en) * | 2020-11-26 | 2021-04-13 | 广西电网有限责任公司桂林供电局 | Sulfur hexafluoride air interchanger |
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