CN110332458B - Gas supplementing device and method for environment-friendly insulating electrical equipment - Google Patents
Gas supplementing device and method for environment-friendly insulating electrical equipment Download PDFInfo
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- CN110332458B CN110332458B CN201910692470.1A CN201910692470A CN110332458B CN 110332458 B CN110332458 B CN 110332458B CN 201910692470 A CN201910692470 A CN 201910692470A CN 110332458 B CN110332458 B CN 110332458B
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- 230000001502 supplementing effect Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 36
- 239000007789 gas Substances 0.000 claims description 274
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000009413 insulation Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 230000003993 interaction Effects 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- 238000010292 electrical insulation Methods 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 8
- 238000010792 warming Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention provides a gas supplementing device and a method for environment-friendly insulated electrical equipment, wherein the device comprises C 4 F 7 N gas cylinder, buffer gas cylinder, inflation gas pipe, ball valve, one-way solenoid valve, temperature sensor, pressure sensor and density sensor, gas mixing jar and control processing apparatus are the intelligent aerating device when using to novel environmental protection gas. The invention can solve the problem of the gas quantity required in the process of inflating and supplementing the equipment, a temperature sensor, a pressure sensor and a density sensor are set in the gas insulated power equipment, and C is determined according to the temperature, the pressure and the gas density parameters respectively acquired by the three sensors 4 F 7 N and buffer gas need supplementary volume respectively, open corresponding ball valve and accomplish the air supplementing operation, can remote control, reduce running cost when guaranteeing its safe operation.
Description
Technical Field
The invention belongs to the technical field of electrical engineering gas insulation, and particularly relates to a gas supplementing device and method for environment-friendly insulated electrical equipment.
Background
SF 6 Insulation and arc extinguishing medium is widely used in gas insulated switchgear (Gas Insulated Switchgear, GIS) and gas insulated transmission lines (Gas Insulated Lines, GIL) and other electrical power equipment, but has global warming potential of about CO 2 The life in the atmosphere is as long as 3200 years, which is harmful to the environment. Thus, seek anNovel SF 6 Environmentally friendly substitute gases are a hotspot problem in the power industry.
C 4 F 7 N has a global warming potential of about CO 2 2100 times lower than SF 6 The gas is nontoxic and noncorrosive, and has a dielectric constant of about SF 6 Is 2 times as large as the above. The liquefaction temperature is high, the liquefaction temperature is about-4.7 ℃ under one atmosphere, and the liquefied temperature is mixed with CO 2 Or N 2 Mixing to reduce the liquefaction temperature to acceptable range, and CO 2 Or N 2 The mixing of the catalyst also reduces the global warming potential of the mixed gas, reduces the harm to the environment, and has better application prospect.
In recent years, with C 4 F 7 N-related experimental studies have been largely developed and it is believed that C4F7N will occupy a place in the insulation of electrical equipment in the near future. However, the inflation and air-supplementing scheme used in the current experiment process is mostly based on the value of the pressure gauge as the basis of the amount of the inflated air, which can cause the insufficient accuracy of the experimental air consumption. In addition, in a certain gas pressure range, the insulation and arc extinguishing performance of the gas and the gas pressure are in positive linear relation, the gas pressure is reduced due to gas leakage, the gas insulation and arc extinguishing performance is reduced, and the normal use of the equipment is seriously affected. In order to ensure reliable operation of gas-insulated power equipment, to improve continuous and reliable operation of a power system, it is necessary to timely inflate equipment with gas leakage.
When the gas leakage equipment is inflated, the manual operation switch is complex in inflation operation process, and errors are easy to generate. In addition, the gas-insulated power equipment applied at present is mostly unattended, if the remote control can be realized to finish the inflation operation, the manpower and material resources can be saved to a great extent, the operation cost is reduced, and the gas-insulated power equipment is used for C 4 F 7 The detection result of the decomposition products of N shows that harmful gases exist, so that workers are prevented from approaching the inflator as much as possible.
Thus, there is a need for a device that can be used for C 4 F 7 N and the mixed gas thereof can be accurately inflated and can be remotely controlled, and the safe operation of the N and the mixed gas thereof is ensuredThe running cost is reduced while the rows are simultaneously.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a gas supplementing device and a gas supplementing method for environment-friendly insulated electrical equipment, which can be used for C 4 F 7 N and the related power equipment of the mixed gas are accurately inflated, can be remotely controlled, and can reduce the operation cost while ensuring the safe operation of the power equipment.
A gas make-up device for an environmentally friendly insulated electrical apparatus, comprising: c (C) 4 F 7 The device comprises an N gas cylinder, a buffer gas cylinder, a gas charging pipe, a ball valve, a one-way electromagnetic valve, a temperature sensor, a pressure sensor, a density sensor, a gas mixing tank and a control processing device;
C 4 F 7 the gas output port of the N gas cylinder is sequentially connected with a first ball valve (9-1), a first one-way electromagnetic valve (10-1), an automatic temperature control heating belt (2), a first mass flowmeter (4-1) and a third one-way electromagnetic valve (10-3) through an inflation gas pipe, and finally is connected with a gas mixing tank; the C is 4 F 7 A first pressure sensor (1-1) is arranged between the gas output port of the N gas cylinder and the first ball valve (9-1), and a first temperature sensor (3-1) and a third pressure sensor (1-3) are arranged between the self-temperature control heating belt (2) and the first mass flowmeter (4-1);
the gas output port of the buffer gas cylinder is connected to the gas mixing tank through a second ball valve (9-2), a second one-way electromagnetic valve (10-2), a second mass flowmeter (4-2) and a fourth one-way electromagnetic valve (10-4) in sequence, a second pressure sensor (1-2) is arranged between the gas output port of the buffer gas cylinder and the second ball valve (9-2), and a fourth pressure sensor (1-4) is arranged between the second one-way electromagnetic valve (10-2) and the second mass flowmeter (4-2);
the gas mixing tank is provided with a fifth pressure sensor (1-5), the output end of the gas mixing tank is connected with the gas input end of a gas booster pump (5) through a fifth one-way electromagnetic valve (10-5), the fifth one-way electromagnetic valve (10-5) is connected with a vacuum pump (6) through a third ball valve (9-3) and a seventh one-way electromagnetic valve (10-7), a seventh pressure sensor (1-7) is arranged between the fifth one-way electromagnetic valve (10-5) connected with the output end of the gas mixing tank and the third ball valve (9-3) connected with the vacuum pump (6), the gas output end of the gas booster pump (5) is connected with the gas input end of a gas insulated power device of mixed gas through a fourth ball valve (9-4) and a sixth one-way electromagnetic valve (10-6), and a second temperature sensor (3-2), a sixth pressure sensor (1-6) and a density sensor (8) are arranged on the gas insulated power device;
the control processing device (7) comprises a signal communication processing module and a man-machine interaction functional module, and is respectively and electrically connected with the gas booster pump (5), the vacuum pump (6), the self-temperature control heating belt (2), all ball valves, the one-way electromagnetic valve and the sensor.
The self-temperature-control heating belt (2) is wound on the gas pipe, is convenient to install and detach, has the power of 20W/m and can be heated to 105 ℃ at most.
The first mass flowmeter (4-1) and the second mass flowmeter (4-2) measure the mass of the flowing gas, and the measurement units are g/min.
C 4 F 7 And N, buffer gas respectively enters the gas mixing tank through two gas input ports of the gas mixing tank, and the structure of the gas mixing tank enables the two gases to be mixed through convection.
The air supplementing method of the air supplementing device for the environment-friendly insulated electrical equipment comprises the following steps of:
step one: firstly, obtaining a density preset value of gas under preset pressure and temperature and the mass of the gas to be filled through calculation, then controlling a processing device (7) to receive signals of a density sensor (8), a second temperature sensor (3-2) and a sixth pressure sensor (1-6), and when the measured density value is lower than the preset value, obtaining the gas filling quantity according to C 4 F 7 N and the relation among the pressure, the temperature and the density of the mixed gas thereof, processing the received signals, calculating the molar volume of the gas in the gas insulated power equipment at the moment, obtaining the mass of the required supplementary gas according to the obtained molar volume, the pressure and the temperature data, and then controlling a processing device (7) to send out signals to start to charge;
step two: closing the first ball valve (9-1), opening the second ball valve (9-2) and opening the third ball valve (9-3),starting a vacuum pump (6) to mix the gas tank and C 4 F 7 The N and the buffer gas are connected with a part of the gas charging pipe of the gas mixing tank to carry out vacuumizing, and a fifth pressure sensor (1-5) on the gas mixing tank is used for transmitting a pressure signal to the control processing device;
step three: stopping vacuumizing when the fifth pressure sensor (1-5) detects that the pressure value is smaller than 1Pa, closing the third ball valve (9-3) at the moment, simultaneously opening the first ball valve (9-1), the self-temperature-control heating belt (2) and the second ball valve (9-2), and opening C 4 F 7 The valve on the gas bottle of N gas and buffer gas, the pressure signal fed back to the control processing device through the first pressure sensor (1-1) and the second pressure sensor (1-2) respectively adjusts the sizes of the first ball valve (9-1) and the second ball valve (9-2), and the gas pressure at the input ends of the first mass flowmeter (4-1) and the second mass flowmeter (4-2) is controlled to be C after heating according to the pressure signal fed back by the third pressure sensor (1-3) 4 F 7 N compression factor is greater than 0.9;
step four: c is respectively closed when the gas mass measured by the first mass flowmeter (4-1) and the second mass flowmeter (4-2) reaches the quantity of the gas required to be supplemented 4 F 7 The first ball valve (9-1) and the second ball valve (9-2) of the valve gas and the output port on the gas cylinder of the N gas and the buffer gas stop inflating;
step five: and closing the first ball valve (9-1) and the second ball valve (9-2) and simultaneously opening the fourth ball valve (9-4), starting the gas booster pump (5) to inflate the electrical insulation power equipment, and when the gas density in the gas insulation power equipment monitored in real time reaches a preset density value, controlling the processing device (7) to send out an instruction to close all the equipment to complete the inflation operation.
A method for supplementing air of an air supplementing device for environment-friendly insulated electrical equipment comprises the following specific related calculation steps:
the C is 4 F 7 N and buffer gas filled mass and C 4 F 7 The N compression factor calculation method is as follows:
α＝[1+k(1-T r 0.5 )] 2 (4)
k＝0.3746+1.5423ω-0.2699ω 2 (5)
wherein: p is the gas pressure; t is the gas temperature; r is a universal gas constant; v is the molar volume; a is a parameter considering intermolecular attraction; b is a parameter that takes into account the volume of the molecule itself; t (T) c Is the critical temperature; p (P) c Is the critical pressure; t (T) r Is the comparison temperature; omega is an eccentric factor; k is an empirical parameter related to an eccentricity factor omega obtained by utilizing vapor pressure data of hydrocarbon substances from a normal boiling point to a critical point; z is a compression factor;
the mixing rule of the P-R state equation is as follows:
a ij ＝(a i a j ) 0.5 (1-k ij ) (8)
wherein: a, a i 、b i State equation constants of the i components respectively; y is i 、y j The mole fractions of the components are respectively; k (k) ij Is the interaction coefficient;
and (3) calculating the density of the mixed gas:
M m ＝y i M i +y j M j (10)
mass calculation of the mixed gas:
m i ＝n m y i M i (13)
m j ＝n m y j M j (14)
wherein: m is M i 、M j The molecular weight of the components i and j; m is M m Is the relative molecular mass of the mixed gas; v (V) m For the molar volume of the mixed gas, the mixed gas state equation constant a obtained by the formulas (7) - (9) m 、b m Carrying out equation solving to obtain the formula (1); ρ m Is the density of the mixed gas; v (V) g Is the total volume of the inflatable tank body; n is n m The amount of the substance that is the mixed gas.
The beneficial effects of the invention are as follows: the invention provides a C 4 F 7 N and its mixed gas electrical apparatus aerate the apparatus and method of air supplement, can aerate the electrical apparatus automatically, can monitor the state of the internal insulating gas of the electrical apparatus in real time, and can upload the apparatus information to the control processing unit and deal with in time; the unidirectional electromagnetic valves are arranged at a plurality of positions in the equipment, so that the condition of gas backflow when the equipment fails is avoided; simultaneously, the theoretical model can accurately calculate the amount of the gas required in the equipment; the operation monitoring personnel can grasp the gas density in the equipment, the gas pressure in the gas cylinder and the information of the completion of gas supplement in real time through the computer and the mobile terminal equipment.
Drawings
FIG. 1 is a schematic diagram showing the structural connection of a gas make-up device for an environment-friendly insulated electrical apparatus according to the present invention;
FIG. 2 is a schematic diagram showing the connection of a control processing device to other structures according to the present invention;
wherein,
1-1 first pressure sensor, 1-2 second pressure sensor, 1-3 third pressure sensor, 1-4 fourth pressure sensor, 1-5 fifth pressure sensor, 1-6 sixth pressure sensor, 1-7 seventh pressure sensor, 2 automatic temperature control heating zone, 3-1 first temperature sensor, 3-2 second temperature sensor, 4-1 first mass flowmeter, 4-2 second mass flowmeter, 5 gas booster pump, 6 vacuum pump, 7 control processing device, 8 density sensor, 9-1 first ball valve, 9-2 second ball valve, 9-3 third ball valve, 9-4 fourth ball valve, 10-1 first one-way solenoid valve, 10-2 second one-way solenoid valve, 10-3 third one-way solenoid valve, 10-4 fourth one-way solenoid valve, 10-5 fifth one-way solenoid valve, 10-6 sixth one-way solenoid valve, 10-7 seventh one-way solenoid valve.
Detailed Description
For better explanation of the present invention, for easy understanding, the technical solution and effects of the present invention will be described in detail below by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, a gas supply device for an environment-friendly insulated electrical apparatus, comprising: c (C) 4 F 7 The device comprises an N gas cylinder, a buffer gas cylinder, a gas charging pipe, a ball valve, a one-way electromagnetic valve, a temperature sensor, a pressure sensor, a density sensor, a gas mixing tank and a control processing device;
C 4 F 7 the gas output port of the N gas cylinder is sequentially connected with a first ball valve 9-1, a first one-way electromagnetic valve 10-1, an automatic temperature control heating belt 2, a first mass flowmeter 4-1 and a third one-way electromagnetic valve 10-3 through an inflation gas pipe, and finally is connected with a gas mixing tank; the C is 4 F 7 A first pressure sensor 1-1 is arranged between the gas output port of the N gas bottle and the first ball valve 9-1, and a first temperature sensor 3-1 and a third pressure sensor 1-3 are arranged between the self-temperature-control heating belt 2 and the first mass flowmeter 4-1; the self-temperature-control heating belt 2 can be wound on the gas pipe, is convenient to install and detach and has the power of20W/m, and the bearing temperature is 105 ℃.
The gas output port of the buffer gas cylinder is connected to the gas mixing tank through a second ball valve 9-2, a second one-way electromagnetic valve 10-2, a second mass flowmeter 4-2 and a fourth one-way electromagnetic valve 10-4 in sequence, a second pressure sensor 1-2 is arranged between the gas output port of the buffer gas cylinder and the second ball valve 9-2, and a fourth pressure sensor 1-4 is arranged between the second one-way electromagnetic valve 10-2 and the second mass flowmeter 4-2;
the first mass flowmeter (4-1) and the second mass flowmeter (4-2) can measure the mass of the flowing gas, the measurement units are g/min, and the flow rate is set according to the set C 4 F 7 The mole fraction ratio of N to the buffer gas and the charging pressure of the gas-insulated power equipment are calculated by controlling the processing device 7 to calculate C 4 F 7 N and buffer gas respectively correspond to the mass, and the corresponding mass information is compared with the first mass flowmeter 4-1 and the second mass flowmeter 4-2 in real time.
C 4 F 7 N, buffer gas respectively enters the gas mixing tank through two gas input ports of the gas mixing tank, and the structure of the gas mixing tank can enable two gases to be mixed through convection.
The output end of the gas mixing tank is connected with the gas input end of a gas booster pump 5 through a fifth one-way electromagnetic valve 10-5, the fifth one-way electromagnetic valve 10-5 is connected with a vacuum pump 6 through a third ball valve 9-3 and a seventh one-way electromagnetic valve 10-7, a seventh pressure sensor 1-7 is arranged between the fifth one-way electromagnetic valve 10-5 connected with the output end of the gas mixing tank and the third ball valve 9-3 connected with the vacuum pump 6, the gas output end of the gas booster pump 5 is connected with the gas input end of a gas insulation power device of mixed gas through a fourth ball valve 9-4 and a sixth one-way electromagnetic valve 10-6, and a second temperature sensor 3-2, a sixth pressure sensor 1-6 and a density sensor 8 are arranged on the gas insulation power device;
as shown in fig. 2, the control processing device 7 is electrically connected with the gas booster pump 5, the vacuum pump 6, the self-temperature-control heating belt 2, all ball valves, one-way solenoid valves and sensors, respectively, and the control processing device 7 is used for receiving the gas mass signals detected by all the mass flowmeters, the pressure signals detected by all the pressure sensors, the temperature signals detected by all the temperature sensors and the density signals of the density sensors, and controlling the operation of the gas booster pump 5 and the vacuum pump 6 through information processing. The control processing device comprises a signal communication processing module and a man-machine interaction function module, wherein the signal communication processing module is composed of Siemens S7-300 communication processing modules, and the man-machine interaction function is realized through self-programming of a singlechip and RS485, so that the temperature, pressure and density of gas in the gas-insulated power equipment can be monitored in real time through a computer and mobile communication equipment, and remote operation can be realized.
In the embodiment, the temperature sensor is an LM35DZ precision temperature sensor, the pressure sensor is a YD-322 universal sensor of a Langchao pressure transmitter, the mass flowmeter is an SLD miniature mass flowmeter, and the density sensor is an Alaba E+H/MEMS coriolis force gas density tester.
The air supplementing method of the air supplementing device for the environment-friendly insulated electrical equipment comprises the following steps of:
step one: firstly, calculating the preset density value of the gas under preset pressure and temperature and the mass of the gas to be filled through formulas (1) - (11), then controlling a processing device 7 to receive signals of a density sensor (8), a second temperature sensor (3-2) and a sixth pressure sensor (1-6), when the measured density value is lower than the preset value, processing the received signals according to the relation among the pressure, the temperature and the density of C4F7N and the mixed gas thereof, calculating the mole fractions yi and yj of each component in the gas insulation power equipment at the moment through formulas (1), (4), (5) and (7) - (11), substituting the obtained mole fractions and the mixed gas density into formulas (10) - (11), obtaining the mole volume of the mixed gas, finally obtaining the required supplementary gas through formulas (11) - (14) and temperature data, and controlling the processing device (7) to start to charge the signals sent by the related devices, wherein the specific calculation formulas are as follows:
the C is 4 F 7 N and buffer gas filled mass and C 4 F 7 N compression factor calculation:
α＝[1+k(1-T r 0.5 )] 2 (4)
k＝0.3746+1.5423ω-0.2699ω 2 (5)
wherein: p is the gas pressure; t is the gas temperature; r is a universal gas constant; v is the molar volume; a is a parameter considering intermolecular attraction; b is a parameter that takes into account the volume of the molecule itself; t (T) c Is the critical temperature; p (P) c Is the critical pressure; t (T) r Is the comparison temperature; omega is an eccentric factor; k is an empirical parameter related to an eccentricity factor omega obtained by utilizing vapor pressure data of hydrocarbon substances from a normal boiling point to a critical point; z is a compression factor;
the mixing rule of the P-R state equation is as follows:
a ij ＝(a i a j ) 0.5 (1-k ij ) (8)
wherein: a, a i 、b i State equation constants of the i components respectively; y is i 、y j The mole fractions of the components are respectively; k (k) ij Is the interaction coefficient;
and (3) calculating the density of the mixed gas:
M m ＝y i M i +y j M j (10)
mass calculation of the mixed gas:
m i ＝n m y i M i (13)
m j ＝n m y j M j (14)
wherein: m is M i 、M j The molecular weight of the components i and j; m is M m Is the relative molecular mass of the mixed gas; v (V) m For the molar volume of the mixed gas, the mixed gas state equation constant a obtained by the formulas (7) - (9) m 、b m Carrying out equation solving to obtain the formula (1); ρ m Is the density of the mixed gas; v (V) g Is the total volume of the inflatable tank body; n is n m The amount of the substance that is the mixed gas.
Assuming that the volume of the electric equipment tank is Vg, the required inflation pressure is P, the temperature is T, and C is regulated 4 F 7 The mole fraction of N is 10% and the buffer gas CO 2 The molar fraction of (2) was 90%. The molar volume Vm of the mixed gas can be calculated by combining the formulas (1) - (9), and then the mixed gas density ρ at a predetermined ratio can be calculated by the formulas (10) and (11) m 。
When the device leaks, the pressure inside the electrical device can changes. Assuming that the gas pressure becomes P1 and the temperature is still T, the mixing can be measured by the density sensorThe density of the mixed gas is ρ m 1. This is what we assume that the mole fraction of C4F7N is y i Then the relative molecular mass M of the mixed gas m Then a reference to y can be used i Expressed by the expression of (2), M m Substitution into (11) to obtain the molar volume V of the mixed gas m Also in relation to y i So we will V m Substitution into equation (1) yields a correlation y i Is obtained by substituting the temperature T and the gas pressure P1 measured by the pressure sensor into equations and solving the equations 4 F 7 Mole fraction y of N i At the same time get CO 2 Molar fraction y of (2) j . The molar volume V of the mixture gas after the air leakage can be obtained by the molar fractions of the components through the formulas (10) and (11) m And then V is arranged m Substituting into the formula (12) to obtain the amount of the gas mixture after gas leakage, and then obtaining C by the formulas (13) and (14) 4 F 7 N and CO 2 And respectively remaining mass, and comparing with a preset value to obtain the mass required to be supplemented by the two gases respectively.
Step two: closing the first ball valve (9-1), opening the second ball valve (9-2) and opening the third ball valve (9-3), and starting the vacuum pump (6) to mix the gas tank and C 4 F 7 The N and the buffer gas are connected with a part of the gas charging pipe of the gas mixing tank to carry out vacuumizing, and a fifth pressure sensor (1-5) on the gas mixing tank is used for transmitting a pressure signal to the control processing device;
step three: stopping vacuumizing when the fifth pressure sensor (1-5) detects that the pressure value is smaller than 1Pa, closing the third ball valve (9-3) at the moment, simultaneously opening the first ball valve (9-1), the self-temperature-control heating belt (2) and the second ball valve (9-2), and opening C 4 F 7 The valve on the gas bottle of N gas and buffer gas, the pressure signal fed back to the control processing device through the first pressure sensor (1-1) and the second pressure sensor (1-2) respectively adjusts the sizes of the first ball valve (9-1) and the second ball valve (9-2), and the gas pressure at the input ends of the first mass flowmeter (4-1) and the second mass flowmeter (4-2) is controlled to be C after heating according to the pressure signal fed back by the third pressure sensor (1-3) 4 F 7 The N compression factor is greater than 0.9 range;
step four: c is respectively closed when the gas mass measured by the first mass flowmeter (4-1) and the second mass flowmeter (4-2) reaches the quantity of the gas required to be supplemented 4 F 7 The first ball valve (9-1) and the second ball valve (9-2) of the valve gas and the output port on the gas cylinder of the N gas and the buffer gas stop inflating;
step five: and closing the first ball valve (9-1) and the second ball valve (9-2) and simultaneously opening the fourth ball valve (9-4), starting the gas booster pump (5) to inflate the electrical insulation power equipment, and when the gas density in the gas insulation power equipment monitored in real time reaches a preset density value, controlling the processing device (7) to send out an instruction to close all the equipment to complete the inflation operation.
Claims (5)
1. A gas supplementing method for a gas supplementing device of an environment-friendly insulated electric apparatus, wherein the gas supplementing device for an environment-friendly insulated electric apparatus comprises: c (C) 4 F 7 The device comprises an N gas cylinder, a buffer gas cylinder, a gas charging pipe, a ball valve, a one-way electromagnetic valve, a temperature sensor, a pressure sensor, a density sensor, a gas mixing tank and a control processing device;
C 4 F 7 the gas output port of the N gas cylinder is sequentially connected with a first ball valve (9-1), a first one-way electromagnetic valve (10-1), an automatic temperature control heating belt (2), a first mass flowmeter (4-1) and a third one-way electromagnetic valve (10-3) through an inflation gas pipe, and finally is connected with a gas mixing tank; the C is 4 F 7 A first pressure sensor (1-1) is arranged between the gas output port of the N gas cylinder and the first ball valve (9-1), and a first temperature sensor (3-1) and a third pressure sensor (1-3) are arranged between the self-temperature control heating belt (2) and the first mass flowmeter (4-1);
the gas output port of the buffer gas cylinder is connected to the gas mixing tank through a second ball valve (9-2), a second one-way electromagnetic valve (10-2), a second mass flowmeter (4-2) and a fourth one-way electromagnetic valve (10-4) in sequence, a second pressure sensor (1-2) is arranged between the gas output port of the buffer gas cylinder and the second ball valve (9-2), and a fourth pressure sensor (1-4) is arranged between the second one-way electromagnetic valve (10-2) and the second mass flowmeter (4-2);
the gas mixing tank is provided with a fifth pressure sensor (1-5), the output end of the gas mixing tank is connected with the gas input end of a gas booster pump (5) through a fifth one-way electromagnetic valve (10-5), the fifth one-way electromagnetic valve (10-5) is connected with a vacuum pump (6) through a third ball valve (9-3) and a seventh one-way electromagnetic valve (10-7), a seventh pressure sensor (1-7) is arranged between the fifth one-way electromagnetic valve (10-5) connected with the output end of the gas mixing tank and the third ball valve (9-3) connected with the vacuum pump (6), the gas output end of the gas booster pump (5) is connected with the gas input end of a gas insulated power device of mixed gas through a fourth ball valve (9-4) and a sixth one-way electromagnetic valve (10-6), and a second temperature sensor (3-2), a sixth pressure sensor (1-6) and a density sensor (8) are arranged on the gas insulated power device;
the control processing device (7) comprises a signal communication processing module and a man-machine interaction functional module, and is respectively and electrically connected with the gas booster pump (5), the vacuum pump (6), the self-temperature control heating belt (2), all ball valves, the one-way electromagnetic valve and the sensor;
the method is characterized by comprising the following steps of:
step one: firstly, obtaining a density preset value of gas under preset pressure and temperature and the mass of the gas to be filled through calculation, then controlling a processing device (7) to receive signals of a density sensor (8), a second temperature sensor (3-2) and a sixth pressure sensor (1-6), and when the measured density value is lower than the preset value, obtaining the gas filling quantity according to C 4 F 7 N and the relation among the pressure, the temperature and the density of the mixed gas thereof, processing the received signals, calculating the molar volume of the gas in the gas insulated power equipment at the moment, obtaining the mass of the required supplementary gas according to the obtained molar volume, the pressure and the temperature data, and then controlling a processing device (7) to send out signals to start to charge;
step two: closing the first ball valve (9-1), opening the second ball valve (9-2) and opening the third ball valve (9-3), and starting the vacuum pump (6) to mix the gas tank and C 4 F 7 N and buffer gas are connected with a part of the gas charging pipe of the gas mixing tank to carry out vacuum pumping, and a fifth pressure sensor (1-5) on the gas mixing tank is used for controlling the processing deviceTransmitting a pressure signal;
step three: stopping vacuumizing when the fifth pressure sensor (1-5) detects that the pressure value is smaller than 1Pa, closing the third ball valve (9-3) at the moment, simultaneously opening the first ball valve (9-1), the self-temperature-control heating belt (2) and the second ball valve (9-2), and opening C 4 F 7 The valve on the gas bottle of N gas and buffer gas, the pressure signal fed back to the control processing device through the first pressure sensor (1-1) and the second pressure sensor (1-2) respectively adjusts the sizes of the first ball valve (9-1) and the second ball valve (9-2), and the gas pressure at the input ends of the first mass flowmeter (4-1) and the second mass flowmeter (4-2) is controlled to be C after heating according to the pressure signal fed back by the third pressure sensor (1-3) 4 F 7 N compression factor is greater than 0.9;
step four: c is respectively closed when the gas mass measured by the first mass flowmeter (4-1) and the second mass flowmeter (4-2) reaches the quantity of the gas required to be supplemented 4 F 7 The first ball valve (9-1) and the second ball valve (9-2) of the valve gas and the output port on the gas cylinder of the N gas and the buffer gas stop inflating;
step five: and closing the first ball valve (9-1) and the second ball valve (9-2) and simultaneously opening the fourth ball valve (9-4), starting the gas booster pump (5) to inflate the electrical insulation power equipment, and when the gas density in the gas insulation power equipment monitored in real time reaches a preset density value, controlling the processing device (7) to send out an instruction to close all the equipment to complete the inflation operation.
2. A gas supplementing method for a gas supplementing device of an environment-friendly insulated electric apparatus according to claim 1, wherein: the self-temperature-control heating belt (2) is wound on the gas pipe, is convenient to install and detach, has the power of 20W/m and can be heated to 105 ℃ at most.
3. A gas supplementing method for a gas supplementing device of an environment-friendly insulated electric apparatus according to claim 1, wherein: the first mass flowmeter (4-1) and the second mass flowmeter (4-2) measure the mass of the flowing gas, and the measurement units are g/min.
4. A gas supplementing method for a gas supplementing device of an environment-friendly insulated electric apparatus according to claim 1, wherein: c (C) 4 F 7 And N, buffer gas respectively enters the gas mixing tank through two gas input ports of the gas mixing tank, and the structure of the gas mixing tank enables the two gases to be mixed through convection.
5. The method for air make-up of an air make-up device for an environmentally friendly insulated electrical apparatus of claim 1, wherein the specific correlation is calculated as follows:
the C is 4 F 7 N and buffer gas filled mass and C 4 F 7 The N compression factor calculation method is as follows:
α＝[1+k(1-T r 0.5 )] 2 (4)
k＝0.3746+1.5423ω-0.2699ω 2 (5)
wherein: p is the gas pressure; t is the gas temperature; r is a universal gas constant; v is the molar volume; a is a parameter considering intermolecular attraction; b is a parameter that takes into account the volume of the molecule itself; t (T) c Is the critical temperature; p (P) c Is the critical pressure; t (T) r Is the comparison temperature; omega is an eccentric factor; k is an empirical parameter related to an eccentricity factor omega obtained by utilizing vapor pressure data of hydrocarbon substances from a normal boiling point to a critical point; z is a compression factor;
the mixing rule of the P-R state equation is as follows:
a ij ＝(a i a j ) 0.5 (1-k ij ) (8)
wherein: a, a i 、b i State equation constants of the i components respectively; y is i 、y j The mole fractions of the components are respectively; k (k) ij Is the interaction coefficient;
and (3) calculating the density of the mixed gas:
M m ＝y i M i +y j M j (10)
mass calculation of the mixed gas:
m i ＝n m y i M i (13)
m j ＝n m y j M j (14)
wherein: m is M i 、M j The molecular weight of the components i and j; m is M m Is relatively divided into mixed gasSub-mass; v (V) m For the molar volume of the mixed gas, the mixed gas state equation constant a obtained by the formulas (7) - (9) m 、b m Carrying out equation solving to obtain the formula (1); ρ m Is the density of the mixed gas; v (V) g Is the total volume of the inflatable tank body; n is n m The amount of the substance that is the mixed gas.
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| CN111059462B (en) * | 2019-10-31 | 2022-03-15 | 湖北工业大学 | Air supplementing method and device for environment-friendly gas insulation equipment |
| CN113090933B (en) * | 2020-01-08 | 2022-12-09 | 国家能源投资集团有限责任公司 | Control method of hydrogen filling station |
| CN112870999B (en) * | 2020-12-29 | 2022-08-26 | 国网浙江省电力有限公司电力科学研究院 | Judge C in air chamber 4 F 7 N and CO 2 Method for producing impurity gas in mixed gas |
| CN113983349B (en) * | 2021-09-22 | 2023-04-11 | 云南电网有限责任公司保山供电局 | Method and system for determining gas supplementing gas of mixed gas insulation equipment |
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