CN110631772A - GIS electrical equipment SF6Gas leakage fault simulation device and method - Google Patents
GIS electrical equipment SF6Gas leakage fault simulation device and method Download PDFInfo
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- CN110631772A CN110631772A CN201911053654.XA CN201911053654A CN110631772A CN 110631772 A CN110631772 A CN 110631772A CN 201911053654 A CN201911053654 A CN 201911053654A CN 110631772 A CN110631772 A CN 110631772A
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- 238000004088 simulation Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 14
- 239000007789 gas Substances 0.000 claims abstract description 239
- 238000003860 storage Methods 0.000 claims abstract description 27
- 229910052573 porcelain Inorganic materials 0.000 claims abstract description 25
- 230000015556 catabolic process Effects 0.000 claims description 37
- 238000012360 testing method Methods 0.000 claims description 24
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000010616 electrical installation Methods 0.000 claims 2
- 241000208340 Araliaceae Species 0.000 abstract description 4
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 abstract description 4
- 235000003140 Panax quinquefolius Nutrition 0.000 abstract description 4
- 235000008434 ginseng Nutrition 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract 2
- 229910018503 SF6 Inorganic materials 0.000 description 59
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000003331 infrared imaging Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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Abstract
The invention discloses a GIS electrical equipment SF6The device comprises a base, a GIS simulation pipeline, a gas storage tank, a mixed gas tank and an electrical control system; a plurality of porcelain sleeves are welded on the GIS simulation pipeline, and small leakage holes are formed in the GIS pipeline and the porcelain sleeves; each gas storage tank is respectively arranged on the base; be equipped with pressure sensor, gas leakage hole and inlet port on the gas mixture jar, gas leakage pipe outside the gas leakage hole, the inlet port is equipped with the intake pipe outward, the other end and the gas holder intercommunication that corresponds of intake pipe all establish the solenoid valve of control pipeline switching on gas leakage pipe and the intake pipe, the gas mixture jar is arranged in GIS simulation pipeline. Simultaneously injecting SF into the mixed gas tank6And N2And then overflows from the leakage hole after mixing; by using SF6And N2The mixed gas of the gases is economical and practical, and can ensure the safety of ginseng cultivation personnel. Can artificially control the air leakage position, adjust the air leakage rate and monitor the air pressure of the mixed gas tank, the colorful LED touch screen carries out operation and monitoring data display, and the operation is intuitive and man-machine interface is friendlyGood results are obtained.
Description
Technical Field
The invention belongs to the technical field of gas leakage detection of high-voltage electrical equipment, and particularly relates to SF (sulfur hexafluoride) electrical equipment of GIS (gas insulated switchgear)6A simulation device and method for gas leakage fault.
Background
The infrared imaging leak detection is a gas leak detection technology which is mature before projects and is more common than common SF6The leak detector has lower detection limit, can accurately detect the gas micro-leakage points of the electrical equipment, and is widely applied to SF (sulfur hexafluoride) in the power production field6And (4) detecting gas leakage. Currently validated SF6An infrared imaging leak detector and a training for carrying out production operation leak detection technology mainly use SF6The steel cylinder is used as a test device, and the steel cylinder is opened and closed to simulate the air leakage of electrical equipment, so that the following problems are caused:
1、SF6the shape of the steel cylinder is greatly different from that of the GIS equipment, and the prior SF6The gas leakage part of the steel cylinder is only provided with a valve, and the conventional gas leakage part of the GIS electrical equipment cannot be accurately simulated;
2. due to SF6The gas leakage of a steel cylinder valve switch is large, and the gas leakage rate of conventional GIS equipment cannot be accurately simulated (the gas leakage rate is low), so that the actual condition comes in and goes out with the actual condition on site;
3. the gas currently used is pure SF6Gas, high price, and SF6The gas density is higher than that of air, and the gas is easy to gather at a low-lying position to cause suffocation of people, so that potential safety hazards exist.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the GIS electrical equipment SF which can realize the artificial control of air leakage, reduce the cost and improve the safety performance6A simulation device and method for gas leakage fault.
The invention provides the GIS electrical equipment SF6The simulation device of the gas leakage fault comprises a base, a GIS simulation pipeline, a gas storage tank, a mixed gas tank and an electrical control system; a plurality of porcelain sleeves are welded on the GIS simulation pipeline, and leakage holes are formed in the GIS simulation pipeline and the porcelain sleeves; each gas storage tank is respectively arranged on the base; the mixed gas tank is provided with a pressure sensor, a gas leakage hole and a gas inlet hole, a gas leakage pipe is arranged outside the gas leakage hole, a gas inlet pipe is arranged outside the gas inlet hole, the other end of the gas inlet pipe is communicated with a corresponding gas storage tank, the gas leakage pipe and the gas inlet pipe are both provided with electromagnetic valves for controlling the opening and closing of the pipeline, and the mixed gas tank is arranged in the GIS simulation pipeline; the electric control system comprises a power supply, a power supply voltage stabilizing assembly, a main control processor, a control panel and relays, wherein the relays are arranged in one-to-one correspondence with the electromagnetic valves, and the electric control system controls the electromagnetic valves to be opened and closed independently through the relays.
In order to facilitate the movement, a pulley is arranged at the bottom of the base to facilitate the movement.
In a specific embodiment, the GIS simulation pipeline is a cylindrical pipeline, three porcelain bushing fixing seats are welded on the upper portion of the cylindrical pipeline, air leakage holes are formed in welding seams, end portions of two ends of the cylindrical pipeline are locked through cover plates, a movable door is arranged on one end of each cover plate, the control panel is arranged outside the movable door, and the main control processor is arranged inside the movable door.
In order to improve the simulation effect, a sealing ring is arranged between the cover plate and the GIS simulation pipeline, and a small hole is formed in the sealing ring to form a gas leakage hole at the threaded connection part.
In one embodiment, the gas storage tank is of two types, one type is SF6Air storage tank, another type is N2An air storage tank.
The invention also provides GIS electrical equipment SF6A method for simulating a gas leakage fault using the simulation apparatus of claim 1 as a tool, comprising the steps of:
step one, controlling all electromagnetic valves to be in a closed state, and injecting SF into a first-class gas storage tank6Injecting N into another gas storage tank2；
Step two, opening an electromagnetic valve on the air inlet pipe, and simultaneously injecting SF into the mixed gas tank6And N2(ii) a The pressure in the mixed gas tank is controlled to be 0.35-0.7 MPa.
And step three, controlling an electromagnetic valve on the gas leakage pipe to be opened, and simulating the mixed gas overflowing from the leakage hole.
Further, in the second step, SF in the mixed gas6The proportion of (A) is 20-30%.
In the second step, the SF in the mixed gas is confirmed6The content method comprises the following steps:
a. calculating SF6And N2The theoretical value of the power frequency breakdown voltage of the mixed gas,
a.1, calculation of 10% SF6The theoretical value of the mixed gas under different gas pressures,
a.2, calculated 20% SF6The theoretical value of the mixed gas under different gas pressures,
a.3, calculating 30% SF6The theoretical value of the mixed gas under different gas pressures,
a.4, calculated to contain 50% SF6The theoretical value of the mixed gas under different gas pressures,
a.5, calculating the SF content of 80%6The theoretical value of the mixed gas under different gas pressures,
a.6, calculating the SF content of 100%6Theoretical values of the mixed gas under different air pressures;
b. determination of SF6And N2The test value of the power frequency breakdown voltage of the mixed gas,
b.1, manufacturing a testing device, wherein the testing device comprises a closed tank, an inflation valve, a pressure gauge, an insulating porcelain bushing, a discharge electrode and a conducting rod, the inflation valve and the pressure gauge are respectively communicated with the closed tank, a pair of conducting rods are symmetrically arranged at two ends of the closed tank, the discharge electrode is connected to the inner end of the conducting rod, the insulating porcelain bushing is sleeved at the outer end of the conducting rod, and the inner end of the conducting rod extends into the closed tank;
b.2, injecting 10% SF into the closed tank6Applying power frequency voltage to the mixed gas from 0kV, starting to slowly increase the voltage until the discharge electrode breaks down when the voltage increases to 75% of the expected breakdown voltage, and determining the breakdown voltage of the mixed gas at the current gas pressureThe values of the tests were as follows,
b.3, continuously injecting the SF solution containing 10 percent of SF into the closed tank6Changing the gas pressure of the mixed gas, repeating b.2 to obtain the SF content of 10% under different gas pressures6The test value of the breakdown voltage of the mixed gas,
b.4, repeating b.2 and b.3, and sequentially injecting the SF containing 20 percent of SF into the closed tank630% SF6Mixed gas of (1), 50% SF6Mixed gas of (1), 80% SF6Mixed gas of (1), 100% SF6The test values of the breakdown voltages of the mixed gases with different proportions under the corresponding air pressure can be obtained;
c. from the theoretical value and the experimental value, the equivalent SF is known6When the gas content ratio is 20-30%, the power frequency breakdown voltage of the mixed gas can reach pure SF675% -80% of the power frequency breakdown voltage of the gas;
d. and (4) adjusting the distance between a pair of discharge electrodes, repeating the steps a and b, and demonstrating the conclusion in the step c.
Further, in said a, the first step of the method,
pure SF6The empirical formula of the gap power frequency breakdown voltage of the gas as the insulating medium is as follows:
SF6and N2The formula of the gap power frequency breakdown voltage of the mixed gas as the insulating medium is as follows:
Eafis the power frequency breakdown voltage, f is the non-uniform coefficient, p is the gas absolute pressure, d is the electrode spacing (cm), x is SF6The proportion of the mixed gas is occupied.
When the invention is used, all the electromagnetic valves are controlled to be in a closed state, and SF is respectively injected into different gas storage tanks6And N2And the corresponding electromagnetic valve on the control pipeline is opened, and the mixed gas overflows from the leakage hole to perform gas leakageAnd (3) simulating. By using SF6And N2The mixed gas of the gas is economical and practical, and can ensure the safety of personnel. And the air leakage position can be manually controlled, the air leakage rate can be adjusted, the air pressure of the mixed gas tank can be monitored through a program, the operation and the monitoring data display are carried out through the color LED touch screen, and the operation is intuitive, and the human-computer interface is friendly.
Drawings
Fig. 1 is a schematic structural diagram of a simulation apparatus according to a preferred embodiment of the present invention.
Fig. 2 is a control block diagram of the present preferred embodiment.
FIG. 3 is a circuit schematic of the master processor in the preferred embodiment.
FIG. 4 is a schematic structural view of the test apparatus in the preferred embodiment.
Sequence numbers of the drawings:
1-base, 11-pulley;
2-GIS simulation pipeline, 21-porcelain bushing fixing seat, 22-cover plate, 23-movable door;
3, a gas storage tank;
4-mixed gas tank;
5, a porcelain bushing;
6, an air inlet pipe;
7-a pressure sensor;
81-main control processor, 82-control panel;
a-test device, A1-closed tank, A2-inflation valve, A3-insulating porcelain bushing, A4-discharge electrode, A5-conducting rod.
Detailed Description
As shown in fig. 1, the GIS electrical device SF disclosed in the present embodiment6The simulator for gas leakage faults comprises a base 1, a GIS simulation pipeline 2, a gas storage tank 3, a mixed gas tank 4 and an electrical control system.
Wherein the base 1 is a rectangular base with a cavity inside, and the bottom of the base is provided with a pulley 11 so as to facilitate the movement of the whole device; the GIS simulation pipeline 2 is fixedly connected to the base 1.
The structure of the GIS simulation pipeline 2 is consistent with that of an actual tank body of GIS electrical equipment, the GIS simulation pipeline is made of a metal pipe with the diameter of 50CM, and the upper left part of the pipeline isThree porcelain bushing fixing seats 21 are welded, during welding, welding is accurately controlled, and the remaining size is proper and meets the conventional SF6Forming a metal tank body welding seam air leakage hole through an air leakage hole of the air inflation equipment; the porcelain sleeve fixing seats 21 are respectively provided with porcelain sleeves 5, and after the porcelain sleeves are formed in a mud blank, air leakage holes (simulating the flange of the porcelain sleeve and the crack and air leakage of the porcelain sleeve) are finely engraved on the upper part, the middle part and the lower part of the porcelain sleeve respectively and then the porcelain sleeve is fired; both ends are tightly covered by adopting a cover plate 22 and a bolt, a sealing ring is arranged between the cover plate and the simulation pipeline, and a small hole is arranged on the sealing ring to form a leakage hole at the threaded connection part; and a movable door 23 is arranged on the right end cover plate and is used for installing relevant parts of an electric control system.
The gas storage tank 3 is provided with two gas storage tanks which are arranged in parallel, wherein one gas storage tank is filled with SF6The other is filled with N2And the two gas storage tanks are respectively arranged in the base and are communicated with the mixed gas tank 4 through a gas inlet pipe 6.
The mixed gas tank 4 is arranged in the GIS simulation pipeline 2, eight electromagnetic valves are connected on the mixed gas tank, six of the eight electromagnetic valves are gas outlet valves for controlling gas outlet of six leakage points, two of the eight electromagnetic valves are gas inlet valves, and the gas inlet valves are communicated with the gas inlet pipe 6 and used for controlling SF6And N2The gas is fed into the gas mixing tank 4, and a pressure sensor 7 is connected outside the gas mixing tank in parallel and used for monitoring the gas pressure of the gas mixing tank.
The electric control system comprises a power supply, a power supply voltage stabilizing component, a main control processor 81, a control panel 82 and relays, wherein the main control processor is arranged in the movable door, the control panel is arranged outside the movable door, the relays and the electromagnetic valves are arranged in a one-to-one correspondence manner, the electric control system independently controls the on and off of the electromagnetic valves through the relays, and a control block diagram is shown in fig. 2.
The main control processor adopts STM32F103R8T6, the processor is positioned as a 32-bit ARM industrial control processor, the temperature application range is-40 to +85 ℃, the antistatic capability is 2000V of a human body discharge model, and 400V of an inter-device discharge model; completely meets the requirements of industrial control grade.
The power supply adopts 12V direct current power supply input, is connected into a common mode rejection and filter circuit after TVS electrostatic protection, and is connected into a DC-DC conversion voltage reduction to be a 5V direct current power supply.
One path of the 5V direct current power supply is subjected to voltage reduction and stabilization through a linear low dropout regulator (LDO) to obtain 3.3V voltage for the main control ARM processor and the peripheral digital circuit power supply.
The other path of the 5V direct current power supply passes through a precision reference voltage chip to obtain a precision voltage source of 3.3V (+/-0.1%) to supply power for an analog-to-digital converter (ADC) of the ARM chip so as to ensure the precision and stability of data collected by the pressure sensor.
The gas pressure transmitter is powered by a 12V voltage series magnetic bead parallel capacitor and is led out after being filtered, the other pin of the pressure transmitter is connected with a reference voltage ground end through a series precision resistor for sampling, and the sampling end is provided with a TVS overvoltage protection circuit and then is sent to an analog acquisition pin of an ARM chip for digital sampling.
The main control ARM processor is connected with the 10-inch LCD touch screen through the RS232 serial interface, all control instructions are sent out through the touch screen, and all states and collected data are visually displayed through the LCD display screen.
The ARM processor outputs control signals of all relays through the IO data buffer, and pushes the relays to control the alternating current electromagnetic valve to perform switching action through the large-current driving chip. The schematic diagram of the circuit is shown in FIG. 3
When the device is used for simulating the gas leakage fault, the method specifically comprises the following steps:
1. controlling each electromagnetic valve to be in a closed state, and injecting SF into a first-class gas storage tank6Injecting N into another gas storage tank2；
2. Opening the electromagnetic valve on the air inlet pipe and simultaneously injecting SF into the mixed gas tank6And N2，SF6The proportion of the mixed gas is 20-30%, the air pressure in the mixed gas tank is controlled to be 0.35-0.7 MPa, and the mixed gas tank is filled with pure SF61.4 times of the back air pressure;
N2as SF6The mixed gas mainly has the following advantages: n is a radical of2The coating is widely available in air, easy to obtain and low in cost; n is a radical of2The liquefaction temperature is low, so that the liquefaction temperature of the mixed gas can be improved; n is a radical of2Is inert gas, and can reduce the oxidative decomposition reaction of SF6 under the action of an electric field. From the theoretical point of viewAnalyzing the power frequency breakdown characteristic of the mixed gas in two aspects of analysis and test, and displaying the result when SF is6When the gas content is 20%, the power frequency breakdown voltage of the mixed gas can reach 75% of that of the pure SF6 gas, and the SF6When the gas content is 30%, the power frequency breakdown voltage rises to 80%, and then along with SF6The gas content is increased, the power frequency breakdown voltage is slowly increased, but SF6The gas cost and the pollution level will increase significantly. The specific process comprises the following steps:
a. calculating SF6And N2The theoretical value of the power frequency breakdown voltage of the mixed gas,
due to pure SF6The empirical formula of the gap power frequency breakdown voltage of the gas as the insulating medium is as follows:
SF6and N2The formula of the gap power frequency breakdown voltage of the mixed gas as the insulating medium is as follows:
Eafis the power frequency breakdown voltage, f is the non-uniform coefficient, p is the gas absolute pressure, d is the electrode spacing (cm), x is SF6The proportion of the mixed gas is increased, when d is 2CM,
a.1, calculation of 10% SF6The theoretical value of the mixed gas under different gas pressures,
a.2, calculated 20% SF6The theoretical value of the mixed gas under different gas pressures,
a.3, calculating 30% SF6The theoretical value of the mixed gas under different gas pressures,
a.4, calculated to contain 50% SF6The theoretical value of the mixed gas under different gas pressures,
a.5, calculating the SF content of 80%6The theoretical value of the mixed gas under different gas pressures,
a.6, calculating the SF content of 100%6Mixed gas inTheoretical value under the same air pressure;
the theoretical values are shown in table 1,
TABLE 1b determination of SF6And N2The test value of the power frequency breakdown voltage of the mixed gas,
b.1, manufacturing a testing device A shown in a figure 3, wherein the testing device A comprises a closed tank A1, an inflation valve A2, a pressure gauge, an insulating porcelain bushing A3, a discharge electrode A4 and a conducting rod A5, the inflation valve and the pressure gauge are respectively communicated with the closed tank, a pair of conducting rods are symmetrically arranged at two ends of the closed tank, the discharge electrode is connected to the inner end of the conducting rod, the insulating porcelain bushing is sleeved at the outer end of the conducting rod, the inner end of the conducting rod extends into the closed tank, and the conducting rod is in threaded connection with the closed tank and can move relatively along the length direction of the closed tank;
b.2, injecting 10% SF into the closed tank6Applying power frequency voltage to the mixed gas from 0kV, starting to slowly increase the voltage until the discharge electrode breaks down when the voltage increases to 75% of the expected breakdown voltage, determining the breakdown voltage test value of the mixed gas under the current gas pressure,
b.3, continuously injecting the SF solution containing 10 percent of SF into the closed tank6Changing the gas pressure of the mixed gas, repeating b.2 to obtain the SF content of 10% under different gas pressures6The test value of the breakdown voltage of the mixed gas,
b.4, repeating b.2 and b.3, and sequentially injecting the SF containing 20 percent of SF into the closed tank630% SF6Mixed gas of (1), 50% SF6Mixed gas of (1), 80% SF6Mixed gas of (1), 100% SF6The test values of the breakdown voltages of the mixed gases with different proportions under the corresponding air pressure can be obtained;
the test values obtained when d is 2CM are shown in table 2,
table 2c, from the theoretical and experimental values, the equivalent SF6When the gas content ratio is 20-30%, the power frequency breakdown voltage of the mixed gas can reach pure SF675% -80% of the power frequency breakdown voltage of the gas;
d. adjusting the distance between a pair of discharge electrodes to d being 1.5CM, repeating the step b, obtaining test values as shown in table 3,
TABLE 3
Thereby demonstrating the conclusion in c. Determination of SF6The optimal proportion in the mixed gas is 20-30%.
3. And controlling the opening of the electromagnetic valve on the gas leakage pipe, and simulating the overflow of the mixed gas from the leakage hole.
The device structure of the invention is consistent with GIS electrical equipment, can manually control the air leakage part, and adopts SF6And N2The mixed gas of the gases is economical and practical, and can ensure the safety of ginseng cultivation personnel. Can accurately simulate the air leakage of common key parts of GIS electrical equipment, can artificially control the air leakage parts and the air leakage rate, and adopts N2And SF6The mixed gas of the gases is economical and practical, and can ensure the safety of ginseng cultivation personnel. The set of SF6Gas leakage fault simulator capable of accurately simulating GIS electrical equipment SF6And the leakage provides safe, accurate and efficient professional training which is in line with field production for ginseng culture personnel. The air leakage position can be manually controlled, the air leakage rate can be adjusted, the air pressure of the mixed gas tank can be monitored through a program, the operation and the monitoring data display are carried out through the color LED touch screen, and the operation is intuitive and the human-computer interface is friendly.
Claims (9)
1. GIS electrical devicePreparation of SF6The simulator for gas leakage faults is characterized in that: the device comprises a base, a GIS simulation pipeline, a gas storage tank, a mixed gas tank and an electric control system;
a plurality of porcelain sleeves are welded on the GIS simulation pipeline, and leakage holes are formed in the GIS simulation pipeline and the porcelain sleeves;
each gas storage tank is respectively arranged on the base;
the mixed gas tank is provided with a pressure sensor, a gas leakage hole and a gas inlet hole, a gas leakage pipe is arranged outside the gas leakage hole, a gas inlet pipe is arranged outside the gas inlet hole, the other end of the gas inlet pipe is communicated with a corresponding gas storage tank, the gas leakage pipe and the gas inlet pipe are both provided with electromagnetic valves for controlling the opening and closing of the pipeline, and the mixed gas tank is arranged in the GIS simulation pipeline;
the electric control system comprises a power supply, a power supply voltage stabilizing assembly, a main control processor, a control panel and relays, wherein the relays are arranged in one-to-one correspondence with the electromagnetic valves, and the electric control system controls the electromagnetic valves to be opened and closed independently through the relays.
2. GIS electrical device SF according to claim 16The simulator for gas leakage faults is characterized in that: the bottom of the base is provided with a pulley so as to move.
3. GIS electrical device SF according to claim 16The simulator for gas leakage faults is characterized in that: the GIS simulation pipeline is a cylindrical pipeline, three porcelain bushing fixing seats are welded at the upper part of the GIS simulation pipeline, air leakage holes are formed in welding seams, the end parts of the two ends of the GIS simulation pipeline are locked through cover plates, a movable door is arranged on one end of each cover plate, the control panel is arranged outside the movable door, and the main control processor is arranged in the movable door.
4. GIS electrical device SF according to claim 16The simulator for gas leakage faults is characterized in that: and a sealing ring is arranged between the cover plate and the GIS simulation pipeline, and a small hole is formed in the sealing ring to form a gas leakage hole at the threaded connection part.
5. The GIS electrical installation of claim 1Preparation of SF6The simulator for gas leakage faults is characterized in that: the gas storage tank has two types, one type is SF6Air storage tank, another type is N2An air storage tank.
6. GIS electrical equipment SF6A method for simulating a gas leakage fault, which is a tool using the simulation apparatus according to claim 1, comprising the steps of:
step one, controlling all electromagnetic valves to be in a closed state, and injecting SF into a first-class gas storage tank6Injecting N into another gas storage tank2；
Step two, opening an electromagnetic valve on the air inlet pipe, and simultaneously injecting SF into the mixed gas tank6And N2(ii) a The pressure in the mixed gas tank is controlled to be 0.35-0.7 MPa.
And step three, controlling an electromagnetic valve on the gas leakage pipe to be opened, and simulating the mixed gas overflowing from the leakage hole.
7. GIS electrical device SF according to claim 66The simulation method of gas leakage fault is characterized in that in the second step, SF in the mixed gas6The proportion of (A) is 20-30%.
8. GIS electrical device SF according to claim 76The simulation method of gas leakage failure is characterized in that in the second step, SF in the mixed gas is confirmed6The content method comprises the following steps:
a. calculating SF6And N2The theoretical value of the power frequency breakdown voltage of the mixed gas,
a.1, calculation of 10% SF6The theoretical value of the mixed gas under different gas pressures,
a.2, calculated 20% SF6The theoretical value of the mixed gas under different gas pressures,
a.3, calculating 30% SF6The theoretical value of the mixed gas under different gas pressures,
a.4, calculated to contain 50% SF6The theoretical value of the mixed gas under different gas pressures,
a.5, calculating the SF content of 80%6The theoretical value of the mixed gas under different gas pressures,
a.6, calculating the SF content of 100%6Theoretical values of the mixed gas under different air pressures;
b. determination of SF6And N2The test value of the power frequency breakdown voltage of the mixed gas,
b.1, manufacturing a testing device, wherein the testing device comprises a closed tank, an inflation valve, a pressure gauge, an insulating porcelain bushing, a discharge electrode and a conducting rod, the inflation valve and the pressure gauge are respectively communicated with the closed tank, a pair of conducting rods are symmetrically arranged at two ends of the closed tank, the discharge electrode is connected to the inner end of the conducting rod, the insulating porcelain bushing is sleeved at the outer end of the conducting rod, and the inner end of the conducting rod extends into the closed tank;
b.2, injecting 10% SF into the closed tank6Applying power frequency voltage to the mixed gas from 0kV, starting to slowly increase the voltage until the discharge electrode breaks down when the voltage increases to 75% of the expected breakdown voltage, determining the breakdown voltage test value of the mixed gas under the current gas pressure,
b.3, continuously injecting the SF solution containing 10 percent of SF into the closed tank6Changing the gas pressure of the mixed gas, repeating b.2 to obtain the SF content of 10% under different gas pressures6The test value of the breakdown voltage of the mixed gas,
b.4, repeating b.2 and b.3, and sequentially injecting the SF containing 20 percent of SF into the closed tank630% SF6Mixed gas of (1), 50% SF6Mixed gas of (1), 80% SF6Mixed gas of (1), 100% SF6The test values of the breakdown voltages of the mixed gases with different proportions under the corresponding air pressure can be obtained;
c. from the theoretical value and the experimental value, the equivalent SF is known6When the gas content ratio is 20-30%, the power frequency breakdown voltage of the mixed gas can reach pure SF675% -80% of the power frequency breakdown voltage of the gas;
d. and (4) adjusting the distance between a pair of discharge electrodes, repeating the steps a and b, and demonstrating the conclusion in the step c.
9. The GIS electrical installation of claim 8Preparation of SF6A simulation method of a gas leakage fault, characterized in that, in said a,
pure SF6The empirical formula of the gap power frequency breakdown voltage of the gas as the insulating medium is as follows:
SF6and N2The formula of the gap power frequency breakdown voltage of the mixed gas as the insulating medium is as follows:
Eafis the power frequency breakdown voltage, f is the non-uniform coefficient, p is the gas absolute pressure, d is the electrode spacing (cm), x is SF6The proportion of the mixed gas is occupied.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295343A (en) * | 2021-04-21 | 2021-08-24 | 国核电站运行服务技术有限公司 | Container leak detection process test device and method |
| CN113586965A (en) * | 2021-06-04 | 2021-11-02 | 南方电网科学研究院有限责任公司 | SF in GIS pipeline6Mixed gas on-line inflating device |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295343A (en) * | 2021-04-21 | 2021-08-24 | 国核电站运行服务技术有限公司 | Container leak detection process test device and method |
| CN113295343B (en) * | 2021-04-21 | 2024-02-20 | 国核电站运行服务技术有限公司 | Container leak detection process test device and method |
| CN113586965A (en) * | 2021-06-04 | 2021-11-02 | 南方电网科学研究院有限责任公司 | SF in GIS pipeline6Mixed gas on-line inflating device |
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