CN108107355A - A kind of SF6And SF6Mixed gas density monitor calibration equipment and method - Google Patents
A kind of SF6And SF6Mixed gas density monitor calibration equipment and method Download PDFInfo
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- CN108107355A CN108107355A CN201711381518.4A CN201711381518A CN108107355A CN 108107355 A CN108107355 A CN 108107355A CN 201711381518 A CN201711381518 A CN 201711381518A CN 108107355 A CN108107355 A CN 108107355A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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Abstract
The present invention relates to a kind of SF6And SF6Mixed gas density monitor calibration equipment and method, device include inlet duct, exhaust apparatus, calibrating installation and host；Inlet duct is set up in parallel and is connected with exhaust apparatus, and inlet duct and exhaust apparatus are connected by gas piping with calibrating installation；The output terminal of calibrating installation and the input terminal of host connect；SF6And SF6Mixed gas density monitor method of calibration step, the present invention are realized in full operating temperature, full working pressure range to SF6And SF6The density monitor of mixed gas is verified, and finds SF in time6And SF6The density monitor of mixed gas there are the defects of, avoid makes power equipment break down due to the damage of density monitor, and replacement SF is carried out with compressed air6Gas avoids SF6The discharge of greenhouse gases, environmental protection.
Description
Technical field
The invention belongs to gas density relays to verify field, is related to a kind of SF6And SF6Mixed gas density monitor school
Experiment device and method.
Background technology
Pure SF6(sulfur hexafluoride) gas is at normal temperatures and pressures colourless, odorless, nontoxic, incombustible gas, tool
There are excellent insulation characterisitic and arc extinguishing ability, be a kind of preferable dielectric.Rapid development and technology with power industry
The raising of equipment, substantial amounts of sulfur hexafluoride breaker and fully closed combined electric unit constantly put into construction and operation, hexafluoro
It is increasing to change sulphur dosage.
But SF6Gas also has its shortcoming in the application：(1) it is more sensitive to electric fields uniform degree, only equal
Its advantage can be just shown in even or slightly uneven electric field；(2) SF of discharge in an atmosphere6Gas is difficult to degrade, in the presence of
Between it is long, to global warming have cumulative effect；(3)SF6The price of gas is higher, improves cost.
In recent years, reduction greenhouse gas emission, environmental protection work are increasingly paid attention to both at home and abroad, it will for response environmental protection
It asks, major relevant industries are reducing the discharge of sulfur hexafluoride greenhouse gases；Also six are being reduced in high-voltage switch gear electrical equipment
Sulfur fluoride gas usage promotes mix insulation gas especially to promote SF in the application of electrical equipment6And N2Mix insulation gas
Use, in use, need to be to SF6And N2Mix insulation gas carries out purity detecting.
SF6Gas or SF6Mixed gas density monitor is SF6One of key element of electrical equipment, it is used for detecting
SF6SF in electrical equipment body6Gas or SF6The variation of mixed gas density, its performance quality directly influence SF6Electrically
The reliable and secure operation of equipment.SF at present6Gas or SF6The method of calibration of mixed gas density monitor, mainly have in engineering with
Under it is several：
(1) SF is utilized6Equipment gas replenishment process verifies density monitor.This method is mainly used for scene, but deposits
In problems with：(1) temperature influences big, it is difficult to ensure that accuracy；(2) SF is utilized6Meter, that is, relative pressure table on gas cylinder
Reading, accuracy is very poor, cannot guarantee that accuracy, in addition to (absolute with the density monitor of measurement absolute pressure value method
Pressure switch), it may directly generate larger error in the area of height above sea level；(3)SF6Density monitor is applied to
Pressure reduction, and verified with gas replenishment process, it is not consistent with practical situations, also influences verification accuracy.
(2) SF is utilized6Equipment deflation course verifies density monitor, and there are (1) in above-mentioned (one) in this way
With (2) it is similary the problem of, and while deflating, will be to SF6Gas is recycled, it is necessary to use special SF6Gas concentration unit, it is very not square
Just.
(3) verified in thermostatic chamber, this method of calibration carries out in isoperibol, eliminates what temperature brought verification
Error, therefore the accuracy verified is higher, but checking time is long, it is necessary to establish special constant temperature laboratory in this way, and
Full-time worker is added, increases the work difficulty at scene, it is both uneconomical or inconvenient.In fact, it verifies at the scene
It is unrealistic.Equally, to density monitor, that is, absolute pressure relay with measurement absolute pressure value method, in the area of height above sea level
Larger error may directly be generated.
(4) current used SF6Gas density relay checking instrument, there is it is similary the defects of or mistake：It can only be
To SF under normal temperature state6Gas density relay is tested, and can not achieve in full operating temperature range to SF6Gas density
Relay is verified, particularly to SF under limit low temperature or the condition of high temperature6Gas density relay is verified.
(5) most SF6Gas density relay checking instrument or method of calibration, such as Chinese patent
201210347820.9 and 201220477478.X, technical solution can only verify pure SF6Gas density relay, and cannot school
Test SF6Mixed gas density monitor.
(6) current used various SF6Gas or SF6Mixed gas density monitor method of calibration, such as Chinese patent
201310641562.X, 201210023988.4 and 201210347820.9, technical solution there is it is similary the defects of or mistake
By mistake：These SF6Gas or SF6Mixed gas density monitor method of calibration all employs SF6Gas is tested, and has been inspected
SF afterwards6Gas has to be discharged in air, causes environmental pollution.
The content of the invention
The technical problems to be solved by the invention are to provide one kind and avoid SF6Full operating temperature and complete is realized in gas discharge
SF under operating pressure6And SF6Mixed gas density monitor calibration equipment and method.
The present invention adopts the following technical scheme that：
SF of the present invention6And SF6Mixed gas density monitor calibration equipment includes inlet duct, exhaust apparatus, calibrating installation
And host；The inlet duct is set up in parallel and is connected with exhaust apparatus, inlet duct and exhaust apparatus by gas piping with
Calibrating installation connects；The output terminal of the calibrating installation and the input terminal of host connect；The SF6Mixed gas is SF6And N2It is mixed
Close gas or SF6And CF4Mixed gas.
SF of the present invention6And SF6Mixed gas density monitor calibration equipment, the pipeline between exhaust apparatus and calibrating installation
The 5th solenoid valve of upper installation；The inlet duct include the first gas-tpe fitting set gradually by pipeline according to gas flow,
First screws valve, compressor and the first solenoid valve；The exhaust apparatus includes what is set gradually according to gas flow by pipeline
Second solenoid valve, vacuum pump, second screw valve and the second gas-tpe fitting.
SF of the present invention6And SF6Mixed gas density monitor calibration equipment, the model Z-0.12/7 of the compressor；Institute
State the model VAA6005 of vacuum pump.
SF of the present invention6And SF6Mixed gas density monitor calibration equipment, the calibrating installation include closed insulating box,
Be arranged on the air accumulator and surge tank being connected side by side with the 5th solenoid valve by pipeline in insulating box, with air accumulator and surge tank
3rd solenoid valve and the 4th solenoid valve surge tank are installed respectively respectively on the pipeline of connection by pipeline and pressure sensor and close
Relay connection is spent, pressure gauge, the mounting temperature sensor in the insulating box, institute are installed by pipeline on the air accumulator
The output terminal for stating pressure sensor and density monitor and temperature sensor is connected respectively with the respective input of host.
SF of the present invention6And SF6Mixed gas density monitor calibration equipment, the model LRHS-101- of the insulating box
LH；The model Pt20 of the temperature sensing；The model PTG500 of the pressure sensor；The model IPC- of host
620H。
SF of the present invention6The method of calibration of density monitor, it is characterised in that using following steps：
Step 1: closing the first solenoid valve, second solenoid valve, the 3rd solenoid valve, the 4th solenoid valve, the 5th solenoid valve are opened
Valve is screwed with second, starts vacuum pump, air accumulator, surge tank and gas piping is vacuumized, when vacuum degree is not more than
Vacuum pump is closed during 133Pa；
Step 2：Second solenoid valve, the 4th solenoid valve are closed, first is opened and screws valve, the first solenoid valve, the 3rd solenoid valve
With the 5th solenoid valve, start compressor, compress air in air accumulator, when reservoir pressure is 2 times of density relays to be measured
Close compressor during device specified duty pressure, while the first solenoid valve, first are screwed into valve again and the 5th solenoid valve is closed；
Step 3：The 4th solenoid valve is opened, the compressed air of air accumulator is slowly introducing surge tank with 0.005MPa/min
In, the pressure of surge tank reaches SF6Density monitor verification object value when close the 3rd solenoid valve and the 4th solenoid valve；
Step 4：The temperature that temperature sensor measures insulating box is T1, it is P that pressure sensor, which measures buffer tank pressure,1, root
According to Beattie-Bridgeman equation：
P=(RTB-A) d2+RTd
A=73.882 × 10-5-5.132105×10-7d
B=2.50695 × 10-3-2.12283×10-6d
R=56.9502 × 10-5
Draw gas density d in surge tank1Value,
In formula：P is pressure, unit：MPa；D is density, unit：kg/m3；T is temperature, unit K；
Step 5：By d in step 41Value and reference temperature(TR) 293K, substitute into Beattie-Bridgeman equation again, calculate
Temperature is T1When correspond to gas pressure P under reference temperature(TR) 293K11, P11Value be SF6Gas density；
Step 6：Compare P11Value and SF to be measured6Density monitor value P10, judge temperature for T1When SF to be measured6
Density monitor it is whether qualified；
Step 7：Oven heat is cooled to temperature T2, temperature holding stablize 10 minutes, pressure sensor measures buffering
Pressure tank is P2, step 4 is repeated to step 6, judges temperature for T2When SF to be measured6Density monitor it is whether qualified；
Verification at a temperature of other any operative pressure target values and any operative repeats step 1 to step 7.
SF of the present invention6Mixed gas density monitor method of calibration, using following steps：
Step 1: closing the first solenoid valve, second solenoid valve, the 3rd solenoid valve, the 4th solenoid valve, the 5th solenoid valve are opened
Valve is screwed with second, starts vacuum pump, air accumulator, surge tank and gas piping is vacuumized, when vacuum degree is not more than
Vacuum pump is closed during 133Pa；
Step 2：Second solenoid valve, the 4th solenoid valve are closed, first is opened and screws valve, the first solenoid valve, the 3rd solenoid valve
With the 5th solenoid valve, start compressor, compress air in air accumulator, when reservoir pressure is 2 times of density relays to be measured
Close compressor during device specified duty pressure, while the first solenoid valve, first are screwed into valve again and the 5th solenoid valve is closed；
Step 3：The 4th solenoid valve is opened, the compressed air of air accumulator is slowly introducing surge tank with 0.005MPa/min
In, the pressure of surge tank reaches SF6The 3rd solenoid valve and the 4th is closed during the verification object value of the density monitor of mixed gas
Solenoid valve；
Step 4：The temperature that temperature sensor measures insulating box is T3, it is P that pressure sensor, which measures buffer tank pressure,3, SF6
The applicable mixing ratio of the density monitor of mixed gas is C；The applicable mixing ratio is SF6The density monitor of mixed gas is fitted
SF6Gas is in SF6Shared volume ratio in mixed gas；
Step 5：According to Dalton's law (of partial pressures), by formula：
P31=P3C
Draw simulation SF6Gas partial pressure P31Value, by formula：
P32=P3(1-C)
Draw simulation SF6Another simple substance CF in mixed gas4Or N2Gas partial pressure P32Value；
Step 6：Calorstat temperature is measured as T by temperature sensor3, simulate SF6Gas partial pressure P31Value, according to
Beattie-Bridgeman equation：
P=(RTB-A) d2+RTd
A=73.882 × 10-5-5.132105×10-7d
B=2.50695 × 10-3-2.12283×10-6d
R=56.9502 × 10-5
Draw simulation SF6Gas divides density d31Value,
In formula：P is pressure, unit：MPa；D is density, unit：kg/m3；T is temperature, unit K；
Step 7：Known analog CF4Or N2Gas partial pressure P32With temperature T3, according to the state equation of perfect gas：
PM=kTd
Draw simulation CF4Or N2Gas divides density d32Value,
In formula, p is pressure, unit：MPa；M is CF4Or N2The molal weight of gas, unit:kg/mol；K is perfect gas
Constant, unit：J/(mol*K)；D is density, unit：kg/m3；T is temperature, unit K；
Step 8：Known analog SF6Gas divides density d31Value and reference temperature(TR) 293K, substitute into beattie-Bridgeman equation again
Graceful equation calculates temperature T3When correspond to simulation SF under reference temperature(TR) 293K6Gas partial pressure P311Value；
Known analog CF4Or N2Divide density d32Value and reference temperature(TR) 293K, again substitute into perfect gas state equation,
Calculate temperature T3When correspond to simulation CF under reference temperature(TR) 293K4Or N2Gas partial pressure P321Value；
Step 9：According to Dalton's law (of partial pressures), by formula：
P301=P311+P321
It is T to draw temperature3When, correspond to the simulation SF under reference temperature(TR) 293K6Mixed gas density P301Value；
Step 10：Compare P301Value and SF6The density monitor P of mixed gas30Value, carry out judging temperature for T3When
SF6Whether the density monitor of mixed gas is qualified；
Step 11：Oven heat is cooled to temperature T4, temperature holding stablize 10 minutes, pressure sensor measures slow
The pressure for rushing tank is P4, step 5 is repeated to step 10, judges temperature for T4When SF to be measured6The density monitor of mixed gas is
No qualification；
Method of calibration at a temperature of other any pressure target values, any operative repeats step 1 to step 11.
Good effect of the present invention is as follows：
1st, SF of the present invention6And SF6Mixed gas density monitor calibration equipment, can both verify pure SF6The density of gas after
Electric appliance can also verify SF6And N2Mixed gas or SF6And CF4The density monitor of mixed gas, while SF6Mixed gas is close
The mixing ratio for spending relay is unrestricted.
2nd, the present invention is realized in full operating temperature, full working pressure range to SF6And SF6The density relay of mixed gas
Device is verified, and finds SF in time6And SF6The density monitor of mixed gas there are the defects of, avoid because of density monitor
It damages and power equipment is made to break down.
3rd, method of calibration of the invention carries out replacement SF with compressed air6Gas avoids SF6The discharge of greenhouse gases is protected
Retaining ring border.
4th, method of calibration of the invention is converted compensation method automatically using computer, is improved work efficiency.
Description of the drawings
Attached drawing 1 is SF of the present invention6And SF6Mixed gas density monitor calibration equipment structure diagram.
Specific embodiment
As shown in Figure 1, SF of the present invention6And SF6Mixed gas density monitor calibration equipment, including inlet duct, exhaust
Device, calibrating installation and host 19；The inlet duct is set up in parallel and is connected with exhaust apparatus, inlet duct and exhaust apparatus
It is connected by gas piping with calibrating installation；The output terminal of the calibrating installation and the input terminal of host connect；The SF6Mixing
Gas is SF6And N2Mixed gas or SF6And CF4Mixed gas.The 5th is installed on pipeline between exhaust apparatus and calibrating installation
Solenoid valve 9；The inlet duct includes the first gas-tpe fitting 1 set gradually according to gas flow by pipeline, first screws
Valve 2,3 and first solenoid valve 4 of compressor；The exhaust apparatus includes the second electricity set gradually according to gas flow by pipeline
Magnet valve 5, vacuum pump 6, second screw 7 and second gas-tpe fitting 8 of valve；The model Z-0.12/7 of the compressor 3；The vacuum
Pump the model VAA6005 of (6).
The calibrating installation includes closed insulating box 10, is arranged in insulating box 10 through pipeline and the 5th solenoid valve 9
The air accumulator 11 and surge tank 12 connected side by side installs the 3rd electricity respectively on the pipeline being connected with air accumulator 11 and surge tank 12
13 and the 4th solenoid valve 14 of magnet valve, surge tank 12 are connected respectively by pipeline with pressure sensor 15 and density monitor 16,
Pressure gauge 17, the mounting temperature sensor 18 in the insulating box 10, the pressure are installed by pipeline on the air accumulator 11
The respective input of sensor 15 and the output terminal of density monitor 16 and temperature sensor 18 respectively with host 19 is connected.It is described
The model LRHS-101-LH of insulating box 10；The model Pt20 of the temperature sensing 18；The type of the pressure sensor (15)
Number be PTG500；The model IPC-620H of host.The air accumulator 11 be stainless steel, thickness 5mm, capacity 10L；
The surge tank 12 be stainless steel, thickness 5mm, capacity 10L.Host 19 is for data processing, output control instruction
With display check results data.
As shown in Figure 1, embodiment one：SF of the present invention6The method of calibration of density monitor, using following steps：
Step 1: closing the first solenoid valve 4, second solenoid valve 5, the 3rd solenoid valve 13, the 4th solenoid valve the 14, the 5th are opened
Solenoid valve 9 and second screws valve 7, starts vacuum pump 6, air accumulator 11, surge tank 12 and gas piping are vacuumized, and takes seriously
Reciprocal of duty cycle closes vacuum pump 6 when being not more than 133Pa；
Step 2：Second solenoid valve 5, the 4th solenoid valve 14 are closed, first is opened and screws valve 2, the first solenoid valve the 4, the 3rd
13 and the 5th solenoid valve 9 of solenoid valve starts compressor 3, compresses air in air accumulator 11, when 11 pressure of air accumulator is 2 times
Close compressor 3 during 16 specified duty pressure of density monitor to be measured, while the first solenoid valve 4, first are screwed into valve 2 and again
Five solenoid valves 9 are closed；
Step 3：The 4th solenoid valve 14 is opened, the compressed air of air accumulator 11 is slowly introducing with 0.005MPa/min slow
It rushes in tank 12, the pressure of surge tank 12 reaches SF6Density monitor 16 verification object value when close 13 He of the 3rd solenoid valve
4th solenoid valve 14；
Step 4：The temperature that temperature sensor 18 measures insulating box 10 is T1, pressure sensor 15 measures surge tank 12 and presses
Power is P1, according to Beattie-Bridgeman equation：
P=(RTB-A) d2+RTd
A=73.882 × 10-5-5.132105×10-7d
B=2.50695 × 10-3-2.12283×10-6d
R=56.9502 × 10-5
Draw gas density d in surge tank 121Value,
In formula：P is pressure, unit：MPa；D is density, unit：kg/m3；T is temperature, unit K；
Step 5：By d in step 41Value and reference temperature(TR) 293K, substitute into Beattie-Bridgeman equation again, calculate
Temperature is T1When correspond to gas pressure P under reference temperature(TR) 293K11, P11Value be SF6Gas density；
Step 6：Compare P11Value and SF to be measured6Density monitor 16 value P10, judge temperature for T1When it is to be measured
SF6Density monitor 16 it is whether qualified；
Step 7：Insulating box 10 heats or is cooled to temperature T2, temperature holding stablize 10 minutes, pressure sensor 15 measures
12 pressure of surge tank is P2, step 4 is repeated to step 6, judges temperature for T2When SF to be measured6Density monitor 16 whether close
Lattice；
The error of indication of density monitor 16, hysterisis error are judged in step 7, and whether qualified foundation is DL/T 259-
2012《Sulfur hexafluoride gas density relay verifies regulation》, the instruction class of accuracy and allowable error pair of density monitor 16
It is shown in Table 1 according to table.
The instruction class of accuracy and the allowable error table of comparisons of 1 density monitor 16 of table
Verification at a temperature of other any operative pressure target values and any operative repeats step 1 to step 7.
As shown in Figure 1, embodiment two：SF6Mixed gas density monitor method of calibration, using following steps：Step
First, the first solenoid valve 4 is closed, opens second solenoid valve 5, the 3rd solenoid valve 13, the 4th solenoid valve 14, the 5th solenoid valve 9 and the
Two screw valve 7, start vacuum pump 6, air accumulator 11, surge tank 12 and gas piping are vacuumized, when vacuum degree is not more than
Vacuum pump (6) is closed during 133Pa；
Step 2：Second solenoid valve 5, the 4th solenoid valve 14 are closed, first is opened and screws valve 2, the first solenoid valve the 4, the 3rd
13 and the 5th solenoid valve 9 of solenoid valve starts compressor 3, compresses air in air accumulator 11, when 11 pressure of air accumulator is 2 times
Close compressor 3 during 16 specified duty pressure of density monitor to be measured, while the first solenoid valve 4, first are screwed into valve 2 and again
Five solenoid valves 9 are closed；
Step 3：The 4th solenoid valve 14 is opened, the compressed air of air accumulator 11 is slowly introducing with 0.005MPa/min slow
It rushes in tank 12, the pressure of surge tank 12 reaches SF6The 3rd electricity is closed during the verification object value of the density monitor 16 of mixed gas
13 and the 4th solenoid valve 14 of magnet valve；
Step 4：The temperature that temperature sensor 18 measures insulating box 10 is T3, pressure sensor 15 measures surge tank 12 and presses
Power is P3, SF6The applicable mixing ratio of the density monitor 16 of mixed gas is C；The applicable mixing ratio is SF6Mixed gas
The applicable SF of density monitor 166Gas is in SF6Shared volume ratio in mixed gas；
Step 5：According to Dalton's law (of partial pressures), by formula：
P31=P3C
Draw simulation SF6Gas partial pressure P31Value, by formula：
P32=P3(1-C)
Draw simulation SF6Another simple substance CF in mixed gas4Or N2Gas partial pressure P32Value；
Step 6：10 temperature of insulating box is measured as T by temperature sensor 183, simulate SF6Gas partial pressure P31Value,
According to Beattie-Bridgeman equation：
P=(RTB-A) d2+RTd
A=73.882 × 10-5-5.132105×10-7d
B=2.50695 × 10-3-2.12283×10-6d
R=56.9502 × 10-5
Draw simulation SF6Gas divides density d31Value,
In formula：P is pressure, unit：MPa；D is density, unit：kg/m3；T is temperature, unit K；
Step 7：Known analog CF4Or N2Gas partial pressure P32With temperature T3, according to the state equation of perfect gas：
PM=kTd
Draw simulation CF4Or N2Gas divides density d32Value,
In formula, p is pressure, unit：MPa；M is CF4Or N2The molal weight of gas, unit:kg/mol；K is perfect gas
Constant, unit：J/(mol*K)；D is density, unit：kg/m3；T is temperature, unit K；
Step 8：Known analog SF6Gas divides density d31Value and reference temperature(TR) 293K, substitute into beattie-Bridgeman equation again
Graceful equation calculates temperature T3When correspond to simulation SF under reference temperature(TR) 293K6Gas partial pressure P311Value；
Known analog CF4Or N2Divide density d32Value and reference temperature(TR) 293K, again substitute into perfect gas state equation,
Calculate temperature T3When correspond to simulation CF under reference temperature(TR) 293K4Or N2Gas partial pressure P321Value；
Step 9：According to Dalton's law (of partial pressures), by formula：
P301=P311+P321
It is T to draw temperature3When, correspond to the simulation SF under reference temperature(TR) 293K6Mixed gas density P301Value；
Step 10：Compare P301Value and SF6The density monitor 16P of mixed gas30Value, carry out judging temperature for T3
When SF6Whether the density monitor 16 of mixed gas is qualified；
Step 11：Insulating box 10 heats or is cooled to temperature T4, temperature holding stablize 10 minutes, pressure sensor 15 is surveyed
The pressure for obtaining surge tank 12 is P4, step 5 is repeated to step 10, judges temperature for T4When SF to be measured6The density of mixed gas after
Whether electric appliance 16 is qualified；
The error of indication of density monitor 16, hysterisis error are judged in step 10, and whether qualified foundation is DL/T 259-
2012《Sulfur hexafluoride gas density relay verifies regulation》, instruction class of accuracy and the allowable error control of density monitor
Table is shown in Table 1.
The instruction class of accuracy of 1 density monitor of table and the allowable error table of comparisons
Method of calibration at a temperature of other any pressure target values, any operative repeats step 1 to step 11.
SF of the present invention6And SF6Mixed gas density monitor calibration equipment, can both verify pure SF6The density relay of gas
Device can also verify SF6And N2Mixed gas or SF6And CF4The density monitor of mixed gas, while SF6Mixed gas density
The mixing ratio of relay is unrestricted.The present invention is realized in full operating temperature, full working pressure range to SF6And SF6Gaseous mixture
The density monitor of body is verified, and finds SF in time6And SF6The density monitor of mixed gas there are the defects of, avoid because
The damage of density monitor and power equipment is made to break down.The method of calibration of the present invention carries out replacement SF with compressed air6Gas
Body avoids SF6The discharge of greenhouse gases, environmental protection.The method of calibration of the present invention is converted compensation side automatically using computer
Method improves work efficiency.
Claims (7)
1. a kind of SF6And SF6Mixed gas density monitor calibration equipment, it is characterised in that it includes inlet duct, exhaust dress
It puts, calibrating installation and host (19)；The inlet duct is set up in parallel and is connected with exhaust apparatus, inlet duct and exhaust apparatus
It is connected by gas piping with calibrating installation；The output terminal of the calibrating installation and the input terminal of host connect；
The SF6Mixed gas is SF6And N2Mixed gas or SF6And CF4Mixed gas.
2. a kind of SF according to claim 16And SF6Mixed gas density monitor calibration equipment, it is characterised in that exhaust
5th solenoid valve (9) is installed on the pipeline between device and calibrating installation；
The inlet duct includes the first gas-tpe fitting (1) set gradually according to gas flow by pipeline, first screws valve
(2), compressor (3) and the first solenoid valve (4)；The exhaust apparatus includes set gradually according to gas flow by pipeline the
Two solenoid valves (5), vacuum pump (6), second screw valve (7) and the second gas-tpe fitting (8).
3. a kind of SF according to claim 26And SF6Mixed gas density monitor calibration equipment, it is characterised in that described
The model Z-0.12/7 of compressor；The model VAA6005 of the vacuum pump.
4. a kind of SF according to claim 16And SF6Mixed gas density monitor calibration equipment, it is characterised in that described
Calibrating installation includes closed insulating box (10), is arranged in insulating box (10) and is connected side by side by pipeline and the 5th solenoid valve (9)
The air accumulator (11) and surge tank (12) connect, the 3rd is installed on the pipeline being connected with air accumulator (11) and surge tank (12) respectively
Solenoid valve (13) and the 4th solenoid valve (14), surge tank (12) pass through pipeline and pressure sensor (15) and density monitor respectively
(16) connect, pressure gauge (17) is installed by pipeline on the air accumulator (11)；
In the insulating box (10) interior mounting temperature sensor (18), the pressure sensor (15), density monitor (16) and
Respective input of the output terminal of temperature sensor (18) respectively with host (19) is connected.
5. a kind of SF according to claim 46And SF6Mixed gas density monitor calibration equipment, it is characterised in that described
The model LRHS-101-LH of insulating box (10)；The model Pt20 of the temperature sensing (18)；The pressure sensor (15)
Model PTG500；The model IPC-620H of host.
6. a kind of SF6Density monitor method of calibration, it is characterised in that using following steps：
Step 1: close the first solenoid valve (4), open second solenoid valve (5), the 3rd solenoid valve (13), the 4th solenoid valve (14),
5th solenoid valve (9) and second screws valve (7), starts vacuum pump (6), to air accumulator (11), surge tank (12) and gas piping
It is vacuumized, vacuum pump (6) is closed when vacuum degree is not more than 133Pa；
Step 2：Close second solenoid valve (5), the 4th solenoid valve (14), open first screw valve (2), the first solenoid valve (4),
3rd solenoid valve (13) and the 5th solenoid valve (9) start compressor (3), compress air in air accumulator (11), work as air accumulator
(11) close compressor (3) when pressure is 2 times of density monitor to be measured (16) specified duty pressures, while again by the first solenoid valve
(4), first valve (2) and the closing of the 5th solenoid valve (9) are screwed；
Step 3：The 4th solenoid valve (14) is opened, the compressed air of air accumulator (11) is slowly introducing with 0.005MPa/min slow
It rushes in tank (12), the pressure of surge tank (12) reaches SF6Density monitor (16) verification object value when close the 3rd electromagnetism
Valve (13) and the 4th solenoid valve (14)；
Step 4：The temperature that temperature sensor (18) measures insulating box (10) is T1, pressure sensor (15) measures surge tank (12)
Pressure is P1, according to Beattie-Bridgeman equation：
P=(RTB-A) d2+RTd
A=73.882 × 10-5-5.132105×10-7d
B=2.50695 × 10-3-2.12283×10-6d
R=56.9502 × 10-5
Draw gas density d in surge tank (12)1Value,
In formula：P is pressure, unit：MPa；D is density, unit：kg/m3；T is temperature, unit K；
Step 5：By d in step 41Value and reference temperature(TR) 293K, substitute into Beattie-Bridgeman equation again, calculating temperature is
T1When correspond to gas pressure P under reference temperature(TR) 293K11, P11Value be SF6Gas density；
Step 6：Compare P11Value and SF to be measured6Density monitor (16) value P10, judge temperature for T1When SF to be measured6's
Whether density monitor (16) is qualified；
Step 7：Insulating box (10) heats or is cooled to temperature T2, temperature holding stablize 10 minutes, pressure sensor (15) measures
Surge tank (12) pressure is P2, step 4 is repeated to step 6, judges temperature for T2When SF to be measured6Density monitor (16) be
No qualification；
Verification at a temperature of other any operative pressure target values and any operative repeats step 1 to step 7.
7. a kind of SF6Mixed gas density monitor method of calibration, it is characterised in that using following steps：
Step 1: close the first solenoid valve (4), open second solenoid valve (5), the 3rd solenoid valve (13), the 4th solenoid valve (14),
5th solenoid valve (9) and second screws valve (7), starts vacuum pump (6), to air accumulator (11), surge tank (12) and gas piping
It is vacuumized, vacuum pump (6) is closed when vacuum degree is not more than 133Pa；
Step 2：Close second solenoid valve (5), the 4th solenoid valve (14), open first screw valve (2), the first solenoid valve (4),
3rd solenoid valve (13) and the 5th solenoid valve (9) start compressor (3), compress air in air accumulator (11), work as air accumulator
(11) close compressor (3) when pressure is 2 times of density monitor to be measured (16) specified duty pressures, while again by the first solenoid valve
(4), first valve (2) and the closing of the 5th solenoid valve (9) are screwed；
Step 3：The 4th solenoid valve (14) is opened, the compressed air of air accumulator (11) is slowly introducing with 0.005MPa/min slow
It rushes in tank (12), the pressure of surge tank (12) reaches SF6It is closed during the verification object value of the density monitor (16) of mixed gas
3rd solenoid valve (13) and the 4th solenoid valve (14)；
Step 4：The temperature that temperature sensor (18) measures insulating box (10) is T3, pressure sensor (15) measures surge tank (12)
Pressure is P3, SF6The applicable mixing ratio of the density monitor (16) of mixed gas is C；The applicable mixing ratio is SF6Gaseous mixture
The applicable SF of the density monitor (16) of body6Gas is in SF6Shared volume ratio in mixed gas；
Step 5：According to Dalton's law (of partial pressures), by formula：
P31=P3C
Draw simulation SF6Gas partial pressure P31Value, by formula：
P32=P3(1-C)
Draw simulation SF6Another simple substance CF in mixed gas4Or N2Gas partial pressure P32Value；
Step 6：Insulating box (10) temperature is measured as T by temperature sensor (18)3, simulate SF6Gas partial pressure P31Value, root
According to Beattie-Bridgeman equation：
P=(RTB-A) d2+RTd
A=73.882 × 10-5-5.132105×10-7d
B=2.50695 × 10-3-2.12283×10-6d
R=56.9502 × 10-5
Draw simulation SF6Gas divides density d31Value,
In formula：P is pressure, unit：MPa；D is density, unit：kg/m3；T is temperature, unit K；
Step 7：Known analog CF4Or N2Gas partial pressure P32With temperature T3, according to the state equation of perfect gas：
PM=kTd
Draw simulation CF4Or N2Gas divides density d32Value,
In formula, p is pressure, unit：MPa；M is CF4Or N2The molal weight of gas, unit:kg/mol；K is normal for perfect gas
Number, unit：J/(mol*K)；D is density, unit：kg/m3；T is temperature, unit K；
Step 8：Known analog SF6Gas divides density d31Value and reference temperature(TR) 293K, again substitute into the graceful side of beattie-Bridgeman equation
Journey calculates temperature T3When correspond to simulation SF under reference temperature(TR) 293K6Gas partial pressure P311Value；
Known analog CF4Or N2Divide density d32Value and reference temperature(TR) 293K, again substitute into perfect gas state equation, calculate
Temperature T3When correspond to simulation CF under reference temperature(TR) 293K4Or N2Gas partial pressure P321Value；
Step 9：According to Dalton's law (of partial pressures), by formula：
P301=P311+P321
It is T to draw temperature3When, correspond to the simulation SF under reference temperature(TR) 293K6Mixed gas density P301Value；
Step 10：Compare P301Value and SF6Density monitor (16) P of mixed gas30Value, carry out judging temperature for T3When
SF6Whether the density monitor (16) of mixed gas is qualified；
Step 11：Insulating box (10) heats or is cooled to temperature T4, temperature holding stablize 10 minutes, pressure sensor (15) survey
The pressure for obtaining surge tank (12) is P4, step 5 is repeated to step 10, judges temperature for T4When SF to be measured6The density of mixed gas
Whether relay (16) is qualified；
Method of calibration at a temperature of other any pressure target values, any operative repeats step 1 to step 11.
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| CN201711381518.4A CN108107355B (en) | 2017-12-20 | 2017-12-20 | SF (sulfur hexafluoride)6And SF6Device and method for checking mixed gas density relay |
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