CN108594916A - A kind of making-up air device and supplementing method for air of SF6 electrical equipments - Google Patents
A kind of making-up air device and supplementing method for air of SF6 electrical equipments Download PDFInfo
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- CN108594916A CN108594916A CN201810694972.3A CN201810694972A CN108594916A CN 108594916 A CN108594916 A CN 108594916A CN 201810694972 A CN201810694972 A CN 201810694972A CN 108594916 A CN108594916 A CN 108594916A
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- 238000000034 method Methods 0.000 title claims abstract description 54
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 36
- 239000007789 gas Substances 0.000 claims description 117
- 238000007599 discharging Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000009469 supplementation Effects 0.000 description 2
- 206010067472 Organising pneumonia Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 208000023367 bronchiolitis obliterans with obstructive pulmonary disease Diseases 0.000 description 1
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- 201000009805 cryptogenic organizing pneumonia Diseases 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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Abstract
The present invention discloses a kind of making-up air device and supplementing method for air of SF6 electrical equipments, and the making-up air device includes：SF6 gas cylinders, connection tracheae, control valve, first pressure sensor, the first temperature sensor and control process device；One end of connection tracheae is sealedly attached on the gas supplementing opening of SF6 electrical equipments, and the other end for connecting tracheae is sealedly attached on the inflating port of making-up air device；First pressure sensor and the first temperature sensor are set between the gas supplementing opening and the inflating port, and control valve is set between inflating port and SF6 gas cylinders, and control process device is connect with first pressure sensor, the first temperature sensor and control valve respectively.The temperature value for the pressure value and the acquisition of the first temperature sensor that the present invention is acquired according to first pressure sensor, obtain the gas density value of SF6 electrical equipments, and the opening and closing of control valve are controlled according to gas density value and the relationship of preset value, without having a power failure or can carry out online tonifying Qi to high-tension switch gear to scene.
Description
Technical field
The present invention relates to electrical equipments, more particularly to a kind of making-up air device and supplementing method for air of SF6 electrical equipments.
Background technology
SF6 gases are obtained extensively as insulation and arc-extinguishing medium in the electrical apparatus due to remarkable insulation and arc extinction performance
General application.Currently, SF6 electrical equipments are 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 drastically expands, and in recent years, SF6 electrical equipment consumptions further increase.
The effect of SF6 gases in the electrical apparatus is arc extinguishing and insulation, and still, in high voltage electric equipment density, which reduces, (such as reveals and draw
Rise) electric property that will seriously affect SF6 high-tension apparatuses, hidden trouble is caused to safe operation.In order to ensure SF6 electrical equipments
Reliability service, improve the continuous reliability service ability of electric system, it is necessary in time to SF6 electrical equipments 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 equipments 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 interruption maintenance immediately, and can extend
The reliable continuous operation ability of SF6 electrical equipments, can also especially make equipment safety operation when cannot have a power failure.And it is right
For SF6 electrical equipments, the insulation or arc extinction performance of the density values of SF6 gases concerning SF6 electrical equipments, to SF6 gases
Density value horizontal processing, is of great significance.Tonifying Qi, mesh are carried out to the SF6 electrical equipments for the slight gas leakage that cannot have a power failure immediately
Preceding substation is much 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.
Invention content
The object of the present invention is to provide a kind of making-up air devices and supplementing method for air of SF6 electrical equipments, realize electrical to SF6
Automatic, the timely tonifying Qi of equipment ensures that the safe operation of SF6 electrical equipments can substantially reduce operation expense again simultaneously.
It especially realizes online tonifying Qi, ensures power grid reliably working.
To achieve the above object, the present invention provides following schemes：
A kind of making-up air device of SF6 electrical equipments, the making-up air device include：
SF6 gas cylinders, connection tracheae, control valve, first pressure sensor, temperature sensor and control process device；
One end of the connection tracheae is sealedly attached on the gas supplementing opening of SF6 electrical equipments, described to connect the another of tracheae
End is sealedly attached on the inflating port of the making-up air device；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 process device 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 process device is acquired according to the first pressure sensor are adopted
The temperature value of collection obtains the gas density value of SF6 electrical equipments, described when the gas density value is less than the first preset value
Control process device controls the control valve and opens, when the gas density value is more than the second preset value, the control process
Device controls the control valve and closes, and second preset value is more than first preset value.
Optionally, the making-up air device includes：Second pressure sensor, the second pressure sensor are set to described
Between SF6 gas cylinders and the control valve, and the second pressure sensor is connect with the control process device.
Optionally, the making-up air device further includes：Flow controller, the flow controller are set to the SF6 gas cylinders
Between the control valve, the control process device is by controlling the flow controller indirect control flow of air supply.
Optionally, the making-up air device further includes：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, piston is housed, there are one adjust for piston connection in the adjusting cylinder
Bar, adjusting rod outer end are equipped with handwheel, drive the piston in the tune by rotating the handwheel and driving the adjusting rod
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 and the vacuum pump of the vacuum valve connect
It connects.
Optionally, the making-up air device further includes：Heater, the heater are mounted on SF6 gas cylinders bottom or week
It encloses.
Optionally, the making-up air device further includes：Pressure reducing valve, the pressure reducing valve are connected to the gas outlet of the SF6 gas cylinders
On.
The present invention also provides a kind of supplementing method for air of SF6 electrical equipments, include the following steps：
Obtain the pressure and temperature of the gas of SF6 electrical equipments；
The first density of gas is determined according to the pressure-temperature characteristic relation of SF6 gases, the pressure and the temperature
Value；
When first density value is more than the first preset value, controls the control valve and open, SF6 electrical equipments are carried out
Tonifying Qi；
The second density value of SF6 electrical equipments is obtained, second density value is close after the progress tonifying Qi of SF6 electrical equipments
Angle value；
When second density value is more than the second preset value, controls the control valve and close, stopping electrically setting SF6
Standby to carry out tonifying Qi, second preset value is more than first preset value.
Optionally, described that gas is determined according to the pressure-temperature characteristic relation of SF6 gases, the pressure and the temperature
The first density value, specifically include：
First density value is calculated using following formula；
Wherein, ρ is density, and unit is kg/m3, and T is temperature, and unit K, P is pressure, and unit MPa, A and B are centre
Variable.
According to specific embodiment provided by the invention, the invention discloses following technique effects：
1, the present invention can be obtained according to the temperature value of pressure value and temperature sensor acquisition that first pressure sensor acquires
To the gas density value of SF6 electrical equipments, and according to the unlatching of gas density value and the relationship of preset value control control valve and pass
It closes, without having a power failure or can carry out online tonifying Qi to high-tension switch gear to scene.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structure connection figure of the making-up air device of SF6 electrical equipments of the present invention；
Fig. 2 is the connection figure of control process device and other structures of the present invention；
Fig. 3 is the flow chart of the supplementing method for air of SF6 electrical equipments of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of making-up air devices and supplementing method for air of SF6 electrical equipments, realize electrical to SF6
Automatic, the timely tonifying Qi of equipment ensures that the safe operation of SF6 electrical equipments can substantially reduce operation expense again simultaneously.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the structure connection figure of the making-up air device of SF6 electrical equipments of the present invention, as shown in Figure 1, the SF6 is electrically set
Standby making-up air device include shell 4, SF6 gas cylinders 3, connection tracheae 19, control valve 10, inflating port 18, first pressure sensor 21,
Second pressure sensor 9, the first temperature sensor 20, second temperature sensor 8, control process device 25.
Described 19 one end of connection tracheae is sealedly connected on the gas supplementing opening of SF6 electrical equipments 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 process device 25.Control process device 25 is according to first pressure sensor
21 and first temperature sensor 20 pressure value and the pressure-temperature characteristic relation of temperature value and SF6 gases carry out data at
Reason, obtains corresponding 20 DEG C of pressure values, i.e. gas density value, 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 pressures and temperature by control process device 25
Model obtains the density value of SF6 gases using the method for hard measurement by the calculation process of control process device 25.Specifically
Process is solved according to SF6 gas density is curvilinear equation (BETTY BOOP-Bridgeman equation), and 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, above-mentioned relation formula is utilized, you can obtain density, the unique solution of ρ, you can to know it
Corresponding 20 DEG C of pressure values (density value).
The gas density value of SF6 electrical equipments can be constantly monitored in this way.When SF6 electrical equipments leak air, gas
When volume density drops to certain value P1, control process device 25 is switched on control valve 10, and the SF6 gases on SF6 gas cylinders 3 will
By connecting in 19 tonifying Qi of tracheae to the inner plenum of SF6 electrical equipments 24, when the gas density of SF6 electrical equipments 24 reaches institute
It is required that setting density value P2 when, control process device 25 is shut off control valve 10, the SF6 gases on SF6 gas cylinders 3 just stop to
24 tonifying Qi of SF6 electrical equipments.Thus online tonifying Qi can be realized automatically to SF6 electrical equipments 24, it is ensured that SF6 electrical equipments
Gas density be on level of security.First temperature sensor 20 is arranged inside the gas circuit on making-up air device, or setting
Inside the gas circuit of connection tracheae 19, or it is arranged on making-up air device；Gas temperature can be measured, or in practical engineering application
Measuring environment temperature is equal to gas temperature.
The present invention also sets up second pressure sensor 9, second temperature sensor 8, is set to SF6 gas cylinders 3 and control valve 10
Between, it is used for acquisition control valve rear end pressure and temperature, to the density of SF6 gas cylinders 3.The setting of second temperature sensor 8 is being mended
Inside gas circuit on device of air, or it is arranged on making-up air device；It is also possible to gas temperature is measured, or in practical engineering application
Upper measuring environment temperature is equal to gas temperature.
In order to more accurately carry out gas flow control, the present invention is also additionally arranged a flow controller 7, flow control
Device 7 is connected with control process device 25, can control the flow of tonifying Qi, require supplementation with gas it is more when, flow can be increased,
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 equipments is connected on valve 12.Exhaust gear is arranged
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 equipments 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, you can to include an adjusting cylinder, adjust and piston is housed in cylinder, there are one adjusting rod, adjusting rod outer end dresses for piston connection
There is handwheel, is moved, realized to online making-up air device gas in adjusting cylinder with piston by rotating handwheel and driving adjusting rod
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 invention further includes heater 2, and heater 2 is mounted on 3 bottom of SF6 gas cylinders, in low temperature or
When gas surplus is a small amount of, 3 pressure rise of SF6 gas cylinders can be made with heater 2, so that gas is more prone to add to equipment
In, while also not wasting gas.Pressure reducing valve 5 is connected on the gas outlet of SF6 gas cylinders 3, can control the flow of gas.
The present invention adds built-in power 17, and built-in power 17 can control the operation of making-up air device.Device can also be external
Connect power supply.The setting of filtration core 22 is on connection tracheae 19, it is ensured that it is clean to cover to the gas of SF6 electrical equipments.In addition
Gas side can also be gone out in SF6 gas cylinders 3 and increase filtration core 6.Connecting 19 both ends of tracheae contains Self-sealing valve simultaneously, it is ensured that connection tracheae is close
Envelope ensures that gas is clean.Contain several wheels 1 on the shell 4 of the intellectual online making-up air device of SF6 electrical equipments, can facilitate
It is mobile.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 of control process device and other structures of the present invention.As shown in Fig. 2, control process device 25 divides
Not with first pressure sensor 21, second pressure sensor 9, the first temperature sensor 20, second temperature sensor 8, control valve
10, flow controller 7, vacuum sensor 13, vacuum pump 16, heater 2 connect.
In addition to this, control process device 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 informations.Operations staff can be changed online making-up air device by mobile phone and be set
Fixed parameter.
In addition, the invention also includes micro- water sensor, micro- water sensor is connected with control process device 25, can monitor
The gas micro water content of SF6 electrical equipments or online making-up air device can alarm when water content is exceeded.It further include decomposition product
Sensor, decomposition product sensor are connected with control process device 25, can monitor SF6 electrical equipments or online making-up air device
Gas decomposition product content can alarm when content is exceeded.Control process device 25 is straight on the spot by display (man-machine interface)
Display dew point value (micro-water content), density value, temperature value are connect, meanwhile, it is linked into power transformation by data communication methods such as RS-485
In complex automatic system of standing, and teletransmission is to unattended station central monitoring station, the center monitoring in substation locality and a distant place
It stands and is monitored in real time, realize the on-line monitoring of SF6 gas density is and micro- water in SF6 electrical equipments.
Fig. 3 is the flow chart of the supplementing method for air of SF6 electrical equipments of the present invention.As shown in figure 3, the supplementing method for air include with
Lower step：
Step 301：Obtain the pressure and temperature of the gas of SF6 electrical equipments；
Step 302：The of gas is determined according to the pressure-temperature characteristic relation of SF6 gases, the pressure and the temperature
One density value；First density value is calculated using following formula；
Wherein, ρ is density, and unit is kg/m3, and T is temperature, and unit K, P is pressure, and unit MPa, A and B are centre
Variable.
Step 303：When first density value is more than the first preset value, controls the control valve and open, it is electrical to SF6
Equipment carries out tonifying Qi；
Step 304：The second density value of SF6 electrical equipments is obtained, second density value is that SF6 electrical equipments are mended
Density value after gas；
Step 305：When second density value is more than the second preset value, controls the control valve and close, stop to SF6
Electrical equipment carries out tonifying Qi, and second preset value is more than first preset value.
Specifically, the application method of the making-up air device of SF6 electrical equipments of the invention is as follows：
Step 1：The valve 12 being connected with vacuum pump 16 is opened, 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 is connected on the gas supplementing opening 23 of SF6 electrical equipments 24, Open valve 11.
Step 3：Control process device 25 is according to the pressure value of first pressure sensor 21 and the first temperature sensor 20
And the pressure-temperature characteristic relation of temperature value and SF6 gases carries out data processing, obtains corresponding 20 DEG C of pressure value (density
Value), constantly monitor the gas density value of SF6 electrical equipments 24.
Step 4：When SF6 electrical equipments leak air, when gas density drops to certain value P1, control process dress
It sets 25 and is switched on control valve 10, the SF6 gases on SF6 gas cylinders 3 will be by connecting 19 tonifying Qi of tracheae to SF6 electrical equipments 24
In inner plenum.
Step 5：When the gas density of SF6 electrical equipments 24 reaches required setting density value P2, control process dress
It sets 25 and is shut off control valve, the SF6 gases on SF6 gas cylinders just stop 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 equipments 24 is on level of security.
Step 6：Operations staff can in time be grasped by mobile phone or computer tonifying Qi information, cylinder gas pressure information,
SF6 inside electric appliance density value informations.Or operations staff can change online making-up air device setting by mobile phone or computer
Parameter.
In short, when SF6 electrical equipments leak air, when gas density drops to certain value P1, online making-up air device
Just give SF6 electrical equipment tonifying Qi.And when the gas density of SF6 electrical equipments 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 equipments
Realize online tonifying Qi, it is ensured that the gas density of SF6 electrical equipments is on level of security.
At the scene in use, the one end for SF6 gases being connected tracheae 19 is connected on the gas supplementing opening of SF6 electrical equipments 24
It connects, the other end of SF6 gases 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 inventive technique application：
1) be not necessarily to have a power failure or to scene can be to the online tonifying Qi of carry out of high-tension switch gear.
2) the online tonifying Qi for realizing SF6 electrical equipments, meets the needs of grid automation and equipment state overhauling, to improving
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 equipments 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, repair, dimension can be substantially reduced in this way
Shield expense.Planned work is accomplished in the passive work for reducing work about electric power personnel, improves efficiency, 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 to have a power failure on power supply quality, especially material time node to avoid because of excessive water content, have
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 operation and old work that maintenance is brought
The insecurity that program tape comes 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 gas leakage density declines on timing node, reduce power off time, improve service quality, have important
Social benefit.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
Principle and implementation of the present invention are described for specific case used herein, and above example is said
The bright method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (10)
1. a kind of making-up air device of SF6 electrical equipments, which is characterized in that the making-up air device includes：
SF6 gas cylinders, connection tracheae, control valve, first pressure sensor, temperature sensor and control process device；
One end of the connection tracheae is sealedly attached on the gas supplementing opening of SF6 electrical equipments, 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 cylinders it
Between, the control process device 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 process device is acquired according to the first pressure sensor acquired
Temperature value obtains the gas density value of SF6 electrical equipments, 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 more than the second preset value, the control process device
It controls the control valve to close, second preset value is more than first preset value.
2. making-up air device according to claim 1, which is characterized in that the making-up air device further includes：Second pressure senses
Device, the second pressure sensor are set between the SF6 gas cylinders and the control valve, and the second pressure sensor with
The control process device connection.
3. making-up air device according to claim 1, which is characterized in that the making-up air device further includes：Flow controller, institute
It states flow controller to be set between the SF6 gas cylinders and the control valve, the control process device is by controlling the stream
Amount controller indirect control flow of air supply.
4. making-up air device according to claim 1, which is characterized in that the making-up air device further includes：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.
5. making-up air device according to claim 4, which is characterized in that the exhaust gear is to adjust cylinder, the adjusting cylinder
Interior that piston is housed, there are one adjusting rod, adjusting rod outer ends, and handwheel is housed for piston connection, and the tune is driven by rotating the handwheel
Pole drives the piston to be moved in the adjusting cylinder in turn, realizes the discharge of air.
6. making-up air device according to claim 4, which is characterized in that the exhaust gear includes：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.
7. making-up air device according to claim 1, which is characterized in that the making-up air device further includes：Heater, it is described to add
Hot device is mounted on SF6 gas cylinders bottom or surrounding.
8. making-up air device according to claim 1, which is characterized in that the making-up air device further includes：Pressure reducing valve, it is described to subtract
Pressure valve is connected on the gas outlet of the SF6 gas cylinders.
9. a kind of supplementing method for air of SF6 electrical equipments, which is characterized in that include the following steps：
Obtain the pressure and temperature of the gas of SF6 electrical equipments；
The first density value of gas is determined according to the pressure-temperature characteristic relation of SF6 gases, the pressure and the temperature；
When first density value is more than the first preset value, controls the control valve and open, SF6 electrical equipments are mended
Gas；
The second density value of SF6 electrical equipments is obtained, second density value is that SF6 electrical equipments carry out the density after tonifying Qi
Value；
It when second density value is more than the second preset value, controls the control valve and closes, stop carrying out SF6 electrical equipments
Tonifying Qi, second preset value are more than first preset value.
10. supplementing method for air according to claim 9, which is characterized in that the pressure-temperature characteristic according to SF6 gases
Relationship, the pressure and the temperature determine the first density value of gas, specifically include：
First density value is calculated using following formula；
Wherein, ρ is density, and unit is kg/m3, and T is temperature, and unit K, P is pressure, and unit MPa, A and B are intermediate variable.
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