CN210375530U - SF (sulfur hexafluoride)6Micro constant pressure leakage simulation device - Google Patents
SF (sulfur hexafluoride)6Micro constant pressure leakage simulation device Download PDFInfo
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Abstract
The utility model discloses a SF6The trace constant-pressure leakage simulation device comprises a cylinder, a piston arranged in the cylinder in a matched mode and a driving device used for driving the piston to move, wherein a pressure reducing valve and an air supplementing valve are arranged on an air inlet pipeline of the cylinder, an experiment box body is arranged at the tail end of an air outlet pipeline of the cylinder, a leakage hole and a release valve used for controlling the leakage hole to release air are arranged on the experiment box body, and a temperature sensor used for measuring the temperature of the air in the cylinder and the pipeline of the cylinder is arranged on the pipeline of the cylinder or the pipeline of the cylinder. The utility model provides an SF6The micro constant-pressure leakage simulation device realizes SF with different pressures6Trace leakage of pure gas and SF6Micro constant pressure leakageThe simulation has the advantages of simple structure, simple and convenient control, small error, good repeatability and capability of outputting quantifiable leakage rate. The utility model also provides a SF6Micro constant pressure leakage simulation method using SF6The micro constant-pressure leakage simulation device realizes SF with different pressures6Simulation of trace leakage of pure gas and SF6And (5) simulating micro constant-pressure leakage.
Description
Technical Field
The utility model relates to a power equipment technical field especially relates to a SF6A micro constant pressure leakage simulation device.
Background
Sulfur hexafluoride (SF)6) The leakage detection work plays an important role in maintaining the insulation performance of electrical equipment, and ensuring the safe, stable and green operation of the equipment and a power grid. GB 50150 and 2016 Electrical Equipment transfer test Standard 12.0.14 Specification: "sensitivity is not less than 1X 10-6When the leak detector (volume ratio) detects the sealing parts of the circuit breaker, the pipeline joint and the like, the leak detector does not give an alarm. SF6Gas quantitative leak detector and SF6The lack of a viable laboratory calibration method for gas imaging leak detectors is mainly due to the lack of a guaranteed SF6A method for simulating constant pressure leakage of a micro leakage simulation device.
The existing trace gas leakage method comprises the following steps: mass flow control methods, positive pressure leak methods, and the like. The mass flow control method is to control SF6Dilution ratio of standard gas and air, and output of SF with different flow rates6The mixed gas with air is leaked under normal pressure, and cannot simulate high-voltage electrical equipment SF6The pressurized leakage of pure gas. The positive pressure leak hole method releases the raw material gas after passing through a standard leak hole under a certain pressure, and controls the leakage amount of the raw material gas by controlling the pressure of the raw material gas, the volume of the gas controlled by the method is obviously influenced by pressure change, and the requirement on the precision of pressure control is higher; and the pressure is regulated by adopting a multi-stage pressure regulating valve, so that the automation degree is low, the control is complex, the manual operation error is inevitably generated, the repeatability is poor, and the quantized leakage rate cannot be output.
SUMMERY OF THE UTILITY MODEL
To above deficiency, the utility model provides a SF6The micro constant pressure leakage simulator can simulate SF with different pressures6Trace leakage of pure gas and realization of SF6And (5) simulating micro constant-pressure leakage.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
SF (sulfur hexafluoride)6Micro constant voltage leaks emulation device, including the cylinder, form a complete set up in piston in the cylinder and be used for the drive arrangement of piston motion, be equipped with relief pressure valve and gulp valve on the air inlet pipe way of cylinder, the end of the air outlet pipe way of cylinder is equipped with the experiment box, be equipped with on the experiment box and let out the leak source and be used for controlling the release valve that lets out the leak source release gas, the cylinder perhaps be equipped with on the pipeline of cylinder be used for measuring the cylinder with the temperature sensor of the gaseous temperature in the pipeline of cylinder.
Furthermore, the leakage holes on the experiment box body are multiple, and the aperture of each leakage hole is different.
Preferably, the number of the leakage holes on the experiment box body is 3, and the hole diameters are 1.2mm, 2.5mm and 4.6mm respectively.
Further, the cylinder or the pipeline of the cylinder is provided with a pressure sensor for measuring the pressure of the cylinder and the gas in the pipeline of the cylinder.
Further, the driving device is a linear stepping motor or a hydraulic cylinder or a pneumatic cylinder.
Further, SF6The micro constant-pressure leakage simulation device further comprises a single-chip microcomputer control system, and the single-chip microcomputer control system is connected with the temperature sensor, the pressure sensor and the driving device respectively.
The utility model adopts a SF6The simulation method of micro constant pressure leakage is used in cooperation with the SF6The micro constant-pressure leakage simulation device comprises the following steps:
s1 air supplementing stage: connecting the air inlet pipeline of the cylinder with an external air source, adjusting the pressure reducing valve to a preset outlet pressure, closing the release valve, opening the air compensating valve and driving the deviceThe piston is driven to move towards the outer side until the air cylinder is filled with SF6Closing the air supply valve by using air;
s2 pressure regulating stage: measuring gas temperature with a temperature sensor according to SF at a certain temperature6The relationship between the pressure and the density of the gas is calculated, the distance of the piston required by the adjustment to the target pressure is calculated, and the driving device pushes the piston to move in the cylinder so as to adjust SF6The gas pressure reaches a target value;
s3 constant pressure leakage stage: opening the relief valve, SF6The gas is released by the leakage hole, and the driving device pushes the piston at a constant speed to keep the pressure in the cylinder stable at a target pressure value, so that constant-pressure leakage is realized.
Further, SF at a certain temperature6The pressure versus density relationship for a gas is obtained by:
P＝56.2×10-6γT(1+B)-γ2A
in the formula: a is 74.9 multiplied by 10-6(1-0.727×10-3γ)；
B＝2.51×10-3γ(1-0.846×10-3γ)；
P-gas pressure, in MPa (absolute);
gamma-gas density in kg/m3；
T-the thermodynamic temperature of the gas, in K.
Further, the driving device propels the piston at a constant speed through different speeds to realize constant pressure leakage under different pressures.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model provides an SF6The micro constant-pressure leakage simulation device realizes SF with different pressures6Trace leakage of pure gas and SF6The micro constant-pressure leakage simulation has the advantages of simple structure, simple and convenient control, small error and good repeatability, and can output quantifiable leakage rate;
2. the utility model provides an SF6The micro constant pressure leakage simulation device can also be used as a test standard generating source of various gas leakage detection instruments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
FIG. 1 shows the SF of the present invention6The structure schematic diagram of the micro constant-pressure leakage simulation device;
FIG. 2 shows SF at a certain temperature6A pressure versus density graph of the gas;
FIG. 3 is adopted under different leakage hole apertures the utility model discloses SF6The relationship curve chart of each set pressure and the leakage rate is obtained by the micro constant pressure leakage simulation device and the method.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to FIG. 1, the present invention provides an SF6Micro constant voltage leaks emulation device, including cylinder 3, the supporting piston 2 that sets up in cylinder 3 and be used for driving the drive arrangement 1 of piston 2 motion, be equipped with relief pressure valve 4 and gulp valve 5 on the inlet line 31 of cylinder 3, the end of the gas outlet line 32 of cylinder 3 is equipped with experiment box 8, be equipped with the leakage hole on the experiment box 8 and be used for controlling the release valve 6 that the leakage hole released gas, be equipped with the temperature sensor 7 that is used for measuring the gaseous temperature in the pipeline of cylinder 3 and cylinder 3 on the pipeline of cylinder 3 or cylinder 3.
In the preferred embodiment, the driving device 1 can preferably use a linear stepping motor or a hydraulic or pneumatic cylinder, and in the preferred embodiment, the driving device 1 preferably uses a linear stepping motor, and the linear stepping motor is operated to drive the piston 2 of the cylinder 3 to make a linear reciprocating motion.
In the preferred embodiment, the gulp valve 5 is located between the pressure reducing valve 4 and the inlet of the cylinder 3, and is located close to the inlet of the cylinder 3. Experiment box 8 also is very close from 3 entrys of cylinder, is equipped with the leakage hole on the experiment box 8, and the outlet pipe way 32 of cylinder 3 gets into experiment box 8 to the lug connection leaks the leakage hole, and release valve 6 is installed in experiment box 8, is located cylinder 3's outlet pipe way 32, can control leakage hole release gas through opening of release valve 6. In a preferred embodiment, the number of the leakage holes on the experimental box body 8 is multiple, and the diameter of each leakage hole is different, specifically, the number of the leakage holes on the experimental box body 8 is 3, the diameters of the leakage holes are respectively 1.2mm, 2.5mm and 4.6mm, and each leakage hole is provided with a release valve 6 so that the control of the release of the gas of each leakage hole can be independent. The pressure reducing valve 4, the air compensating valve 5 and the release valve 6 are electromagnetic valves or electric valves.
The temperature sensor 7 is arranged on the pipeline of the cylinder 3 and used for measuring the temperature of the gas in the pipeline of the cylinder 3 and the cylinder 3, and the temperature sensor 7 preferably adopts a square-shell patch type PT100 platinum thermal resistance temperature sensor.
In the preferred embodiment, the cylinder 3 is provided with a pressure sensor 9 in the conduit for measuring the pressure of the gas in the conduit for the cylinder 3 and the cylinder 3, the pressure sensor 9 preferably being a gas pressure sensor of the type SETech PMS. In the case of charging the cylinder 3 with the pressure reducing valve 4, the initial gas pressure at the time of filling the cylinder 3 with gas is theoretically equal to the preset outlet pressure of the pressure reducing valve 4, but in order to enable real-time monitoring and real-time acquisition and correction of the gas pressure in the cylinder 3 in the subsequent operation, it is preferable to provide a pressure sensor 9 for real-time monitoring of the gas pressure in each stage in the cylinder 3.
In some preferred embodiments, a single chip microcomputer control system may be introduced to implement automatic control, and the single chip microcomputer control system may be a single chip microcomputer control system commonly used in the prior art, and is connected to the temperature sensor 7, the pressure sensor 9, and the driving device 1, respectively. After the singlechip control system is introduced, the gas temperature detected by the temperature sensor 7 and the gas pressure detected by the pressure sensor 9 can be transmitted to the singlechip control system, the singlechip control system controls the driving device 1 according to the received information and by combining with a preset relevant program, and the air pressure in the air cylinder 3 is changed by controlling the driving device 1 and changing the speed of the driving device 1 for driving the piston 2 to move.
Using the above SF6SF (sulfur hexafluoride) by trace constant-pressure leakage simulation device6The method for simulating the micro constant-pressure leakage comprises the following steps:
s1 air supplementing stage: connecting an air inlet pipeline 31 of the cylinder 3 with an external air source, adjusting a pressure reducing valve 4 to preset outlet pressure, closing a release valve 6, opening an air compensating valve 5, and driving a piston 2 to move towards the outside by a driving device 1 until the cylinder is filled with SF6And (5) closing the air supply valve 5.
In the preferred embodiment, the air intake line 31 is connected to SF6The pressure reducing valve 4 outputs SF with the initial pressure of 0.2MPa (absolute pressure)6Gas, open the gulp valve 5, the linear stepping motor pulls back the piston 2 through the reverse rotation until the cylinder 3 is full of SF6Gas, at this time, the initial pressure of the cylinder is set to P0Setting the cylinder volume as the initial volume V0。
S2 pressure regulating stage: the gas temperature is measured by a temperature sensor 7 according to SF at a certain temperature6The relationship between the pressure and the density of the gas is calculated, the distance of the piston 2 required by the adjustment to the target pressure is calculated, and the driving device 1 pushes the piston 2 to move in the cylinder 3 for adjusting SF6The gas pressure reaches the target value.
In this embodiment, SF6Gas temperature sensor measurement. The gas pressure in the common GIS electrical equipment is usually 0.4-0.8 MPa, and the SF in the pressure regulating stage6The pressure range in the relation between the pressure and the density of the gas is selected from the range of 0.4MPa to 0.8MPa (simulating the pressure of the gas in the GIS electrical equipment).
SF at a certain temperature6The pressure versus density relationship for a gas is obtained by:
P＝56.2×10-6γT(1+B)-γ2A (1)
in the formula: a is 74.9 multiplied by 10-6(1-0.727×10-3γ)；
B＝2.51×10-3γ(1-0.846×10-3γ)；
P-gas pressure, in MPa (absolute);
gamma-gas density in kg/m3；
T-the thermodynamic temperature of the gas, in K.
From equation (1), the relationship between gas pressure and density at different temperatures in this pressure range is obtained, as shown in FIG. 2. As can be seen from fig. 2, the gas pressure and density are linear with a linear correlation coefficient higher than 0.999 at a certain temperature.
Taking a gas pressure and density relation curve at 20 ℃ as an example, a straight line equation (2) is obtained by fitting, and the linear correlation coefficient is 0.9996.
P＝0.0139γ+0.0479 (2)
The relationship between the gas density and the volume is shown in the formula (3),
γ＝m/V (3)
in the formula: m is gas mass in kg;
v-gas volume in m3。
The formula (3) is taken into the formula (2) to obtain a relational expression (4) of gas pressure and volume at the same temperature.
P＝0.0139m/V+0.0479 (4)
The initial pressure after charging in the cylinder 3 is P0Volume is V0. The gas mass is not changed, when the pressure in the cylinder 3 is regulated to the set pressure P1At this time, the volume V of gas in the cylinder 31Obtained by the formula (5).
V1＝V0(P0-0.0479)/(P1-0.0479) (5)
At this time, the driving device 1 (linear stepping motor in the preferred embodiment) advances the piston 2 by a distance l1Obtained by the formula (6).
l1＝(V0-V1)/(πr2) (6)
In the formula: r-radius of the inner wall of the cylinder 3, in m.
S3 constant pressure leakage stage: opening the relief valve 6, SF6The gas is released from the leakage hole, the driving device 1 pushes the piston 2 at a constant speed to keep the pressure in the cylinder 3 stable at a target pressure value, and therefore constant pressure leakage is achieved.
The gas leakage rate can be calibrated by a leakage rate calibration device, the leakage rate calibration device generally comprises a calibration tool, a standard glass metering pipette (metering mark, measuring range 0.2mL, 2mL and the like), a stopwatch and the like, and the leakage rate range can be calibrated: 0.001mL/s to 1 mL/s. Soap solution and soap film formation, SF, in a standard glass metering pipette6SF released by micro constant-pressure leakage simulation device6When gas flows into the glass metering pipette, the soap film is pushed to move in the glass metering pipette, the moving distance is the volume of the leaked gas, the volume of the leaked gas in a certain time is measured, and the formula (7) is carried in, so that the leakage rate value can be obtained.
V＝L·t·10-6(7)
In the formula: v-volume of gas leaked in m3；
L is leakage rate, and the unit is mL/s;
t-leak time in units of s.
At SF6In the gas leakage process, if the driving device 1 stops moving, that is, the piston 2 stops moving into the cylinder 3, the pressure in the cylinder 3 decreases along with the gas leakage. In order to keep the pressure in the cylinder 3 stable at the set pressure P1The driving device 1 needs to continuously push the piston 2 to move forward.
The leakage volume measured by the leakage rate calibration device is the leakage volume under the atmospheric pressure, and the reference formula (5) can be converted into the set pressure P1The leak volume at that time, equation (8) was obtained.
V1＝V(Pa-0.0479)/(P1-0.0479) (8)
In the formula: paAtmospheric pressure in MPa.
At this time, the distance l that the driving device 1 needs to push the piston 2 to advance is obtained2Comprises the following steps:
l2＝L·t·10-6(Pa-0.0479)/(P1-0.0479)/(πr2) (9)
from the equation (9), the advancing rate (L/t, L means the advancing distance of the piston) of the piston 2, the leakage rate (L) and the set pressure (P)1) It is related. When the pressure in the cylinder 3 is constant, the leakage rate of the gas released from the fixed leakage hole is constant, so that the propulsion rate of the driving device 1 driving the piston 2 is also constant. That is, when the driving device 1 pushes the piston 2 at a constant speed, the pressure in the cylinder 3 can be kept constant, and at this time, a certain gas leakage rate is corresponded, so that the driving device 1 pushes the piston 2 at a constant speed, the pressure in the cylinder 3 can be kept stable at a target pressure value, and constant pressure leakage is realized. The pressure in the cylinder 3 can be changed by changing the propelling speed of the driving device 1 for driving the piston 2, namely when the driving device 1 propels the piston 2 at a constant speed at different speeds, constant pressure leakage under different pressures can be realized.
In a specific embodiment, the drive unit 1 pushes the piston 2 at a constant speed, releasing SF from the leakage hole6Gas, under the condition of normal temperature, adopting leakage rate calibration device to test SF6The leakage rate of the micro constant pressure leakage simulation device under the pressure of 0.8MPa is 1.2mm, and the test result is shown in Table 1.
Table 1 leak rate calibration device test results
As can be seen from Table 1, the leakage rate results of 6 measurements are basically consistent, and it is verified that the driving device 1 can keep the pressure in the cylinder 3 stable at the target pressure by uniformly propelling the piston 2, so as to realize constant-pressure leakage. SF6The micro constant pressure leakage simulation device can also change the propelling speed of the piston 2Simulating SF of insulating air chambers with different pressures by uniform speed propulsion6The pure gas is leaked in a micro constant pressure mode.
In a preferred embodiment, SF6 Three release valves 6 are arranged on an air outlet pipeline of the micro constant-pressure leakage simulation device, each release valve 6 controls the release of one leakage hole, one path or multiple paths of sulfur hexafluoride gas can be released, and therefore SF in the field electrical equipment of the transformer substation is simulated6A gas leakage condition.
As can be seen from equation (9), the faster the piston advances, the greater the in-cylinder pressure, and the greater the leak rate through the same leak hole. The size of the leakage rate is also related to the aperture of the leakage hole, and theoretically, the larger the aperture is, the larger the leakage rate is.
SF mentioned above6The micro constant pressure leakage simulation method is used for carrying out leakage rate tests of different leakage holes under different pressures. Under the condition of 20 ℃, firstly, the set pressure is adjusted to be 0.4MPa, three release valves 6 are opened one by one (only one release valve 6 is opened each time), the aperture sizes of the leakage holes A, B, C corresponding to the release valves 6 are 1.2mm, 2.5mm and 4.6mm in sequence, and the leakage rate of the leakage hole A, B, C is tested by a leakage rate calibration device respectively; then, the pushing speed of the driving device 1 is changed to adjust the pushing speed of the piston 2, so that the set pressure is sequentially increased to 0.5MPa, 0.6MPa, 0.7MPa and 0.8MPa, the previous step is repeated to perform constant-pressure leakage under the pressure of 0.5MPa, 0.6MPa, 0.7MPa and 0.8MPa on the three leakage holes respectively, the leakage rate change of each leakage hole is tested, and the test result is shown in fig. 3.
Fig. 3 shows that the leak rate increases with increasing set pressure for a fixed bore diameter leak hole. Under the same pressure, the leakage rate of the leakage holes with different apertures is different, and the positive correlation trend is presented. By the combined application of the propelling speed and the leakage holes with different apertures, the continuously adjustable leakage rate can be obtained.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. SF (sulfur hexafluoride)6Micro constant voltage leaks analogue means, its characterized in that: including cylinder (3), supporting set up in piston (2) in cylinder (3) and be used for the drive arrangement (1) of piston (2) motion, be equipped with relief pressure valve (4) and gulp valve (5) on air inlet pipeline (31) of cylinder (3), the end of gas outlet pipeline (32) of cylinder (3) is equipped with experiment box (8), be equipped with the leakage hole on experiment box (8) and be used for controlling release valve (6) of leakage hole release gas, cylinder (3) perhaps be equipped with on the pipeline of cylinder (3) and be used for measuring cylinder (3) with temperature sensor (7) of the temperature of the gas in the pipeline of cylinder (3).
2. SF according to claim 16Micro constant voltage leaks analogue means, its characterized in that: the leakage holes in the experiment box body (8) are multiple, and the aperture of each leakage hole is different.
3. SF according to claim 26Micro constant voltage leaks analogue means, its characterized in that: the number of the leakage holes in the experiment box body (8) is 3, and the hole diameters are 1.2mm, 2.5mm and 4.6mm respectively.
4. SF according to claim 16Micro constant voltage leaks analogue means, its characterized in that: the cylinder (3) or the pipeline of the cylinder (3) is provided with a pressure sensor (9) used for measuring the pressure of the cylinder (3) and the gas in the pipeline of the cylinder (3).
5. SF according to claim 16Micro constant voltage leaks analogue means, its characterized in that: the driving device (1) is a linear stepping motor or a hydraulic cylinder or a pneumatic cylinder.
6. SF according to claim 46Micro constant voltage leaks analogue means, its characterized in that: the device is characterized by further comprising a single chip microcomputer control system, wherein the single chip microcomputer control system is respectively connected with the temperature sensor (7), the pressure sensor (9) and the driving device (1).
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| CN110411663A (en) * | 2019-08-21 | 2019-11-05 | 广西电网有限责任公司电力科学研究院 | A kind of SF6Micro constant pressure Leaking Simulation devices and methods therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110411663A (en) * | 2019-08-21 | 2019-11-05 | 广西电网有限责任公司电力科学研究院 | A kind of SF6Micro constant pressure Leaking Simulation devices and methods therefor |
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