CN111175193A - SF6 mixed insulating gas test device and test method - Google Patents
SF6 mixed insulating gas test device and test method Download PDFInfo
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- CN111175193A CN111175193A CN201911329141.7A CN201911329141A CN111175193A CN 111175193 A CN111175193 A CN 111175193A CN 201911329141 A CN201911329141 A CN 201911329141A CN 111175193 A CN111175193 A CN 111175193A
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- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 238000010998 test method Methods 0.000 title claims description 21
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 75
- 238000001514 detection method Methods 0.000 claims abstract description 66
- 238000009792 diffusion process Methods 0.000 claims abstract description 28
- 238000011160 research Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 321
- 238000002156 mixing Methods 0.000 claims description 76
- 238000000034 method Methods 0.000 claims description 25
- 238000005057 refrigeration Methods 0.000 claims description 23
- 239000003463 adsorbent Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 15
- 238000010586 diagram Methods 0.000 claims description 13
- 238000010835 comparative analysis Methods 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 229910018503 SF6 Inorganic materials 0.000 description 93
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 93
- 238000009413 insulation Methods 0.000 description 10
- 238000012544 monitoring process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
Abstract
The invention discloses an SF6 mixed insulating gas test device, which comprises a supporting platform, and a gas test system, a temperature control system and an intelligent detection control system which are fixed on the supporting platform, wherein the gas test system is connected with the temperature control system and the intelligent detection control system; the gas test system comprises a sealing tank, a temperature control pipeline, a vacuum meter and a plurality of sensors, wherein the sensors comprise a temperature sensor, a pressure sensor and a humidity sensor. The device has the advantages that the device realizes the research on the influence of different temperatures, gas pressures and gas types on the gas state of the mixed insulating gas and the diffusion of decomposition products.
Description
Technical Field
The invention relates to the technical field of electrical equipment insulation tests, in particular to a SF6 mixed insulating gas test device and a test method.
Background
Gas insulation is one of important insulation modes of electrical equipment, the most widely used insulation gas at present is SF6 (sulfur hexafluoride), and the excellent insulation performance of the gas insulation can effectively reduce the volume of the electrical equipment, reduce the weight of the equipment, reduce the floor area of the equipment and prolong the overhaul period of the equipment.
The insulation performance of SF6 in electrical equipment is related to the state of gas, the insulation performance of SF6 gas is in positive correlation with the pressure of gas within a certain range, the liquefaction temperature of SF6 gas (when the gas pressure is 0.23 MPa) is-50.8 ℃, the pressure of SF6 gas in a common breaker gas chamber is 0.6-0.7 MPa, and the corresponding liquefaction temperature is about-30 ℃, so that the extremely low temperature in winter in northeast, Xinjiang, inner Mongolia, Qinghai-Tibet plateau and other areas of China can cause the liquefaction of SF6 gas in the equipment, and the insulation performance of the equipment is reduced. Meanwhile, SF6 is a strong greenhouse effect gas, the greenhouse effect potential of the SF6 is about 23900 times of that of CO2, and with the increasing use amount of SF6 gas, the greenhouse effect brought by the SF is increasingly concerned by society. The use of other gases such as N2, CF4, etc. mixed with SF6 to form SF6 mixed insulating gas instead of pure SF6 in electrical equipment is used to reduce the usage amount of SF6 and reduce the influence of SF6 gas on the environment, and is a hot spot in insulation gas research at present. However, the physical and chemical properties of the mixed insulating gas formed by mixing the gases such as N2 or CF4 with SF6 are obviously different from those of the pure SF6 gas, and it is necessary to thoroughly and thoroughly study the mixed insulating gas and apply the gas to equipment.
The existing devices for researching the performance of the SF6 mixed insulating gas are designed based on the electrical performance of the gas, and the emphasis is to research the relationship between the type of equipment failure (discharge, heat generation, and the like) and the gas properties (such as gas pressure, mixed gas mixing ratio, and the like). However, these devices are not designed specifically for the study of the state parameters and physical and chemical properties of the SF6 mixed insulating gas, and cannot systematically and scientifically study the influence of factors such as temperature, pressure, gas type, gas leakage, adsorbent and the like on the processes such as the distribution state of the mixed gas, the diffusion process of decomposition products, the change in gas humidity, and the liquefaction of the gas.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a can simulate different temperature, gas pressure and gas type and to mix, the test device of the gas state influence of decomposition product diffusion to solve the problem that different temperature, gas pressure, gas type can't be studied to the gas state influence that mixes, decomposition product diffusion of mixed insulating gas in the current device.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides a SF6 mixes insulating gas test device, includes supporting platform and fixes gas test system, temperature control system and the intellectual detection system control system on supporting platform, temperature control system and intellectual detection system control system are all connected to gas test system.
Gas test system includes seal pot, accuse temperature pipeline, vacuum gauge and a plurality of sensor, be equipped with accuse temperature pipeline in the seal pot, accuse temperature pipeline's access & exit all connects temperature control system, be equipped with vacuum gauge and a plurality of sensor on the seal pot, the intelligent detection control system is all connected to the sensor, still be equipped with a plurality of air inlets on the seal pot, be used for connecting evacuating device's first interface and a plurality of second interface that are used for connecting mixing ratio detector or SF6 decomposition product detector, air inlet, first interface and second interface all set up the different positions on the seal pot.
The sensor includes temperature sensor, pressure sensor and humidity transducer, temperature sensor, pressure sensor and humidity transducer all set up the different positions on the seal pot and all are connected with the intellectual detection system electricity.
Preferably, temperature control system is including heating branch road, refrigeration branch road, circulating pump and control cabinet, it is parallelly connected with the refrigeration branch road to heat the branch road, the input and the temperature control pipeline entry intercommunication of branch road and refrigeration branch road heat, and the output passes through circulating pump and temperature control pipeline export intercommunication and forms the return circuit, it all connects the control cabinet to heat branch road, refrigeration branch road and circulating pump, the control cabinet is fixed in the supporting platform side.
Preferably, the heating branch comprises a first electromagnetic valve, a heating device and a second electromagnetic valve, the first electromagnetic valve, the heating device and the second electromagnetic valve are all connected with the console and are communicated through a pipeline in sequence, the input end of the first electromagnetic valve is connected with the inlet of the temperature control pipeline, and the output end of the second electromagnetic valve is connected with the circulating pump.
Preferably, the refrigeration branch comprises a third electromagnetic valve, a first-stage refrigeration device, a second-stage refrigeration device and a fourth electromagnetic valve, the third electromagnetic valve, the first-stage refrigeration device, the second-stage refrigeration device and the fourth electromagnetic valve are all connected with the console and are communicated through a pipeline in sequence, the input end of the third electromagnetic valve is connected with the inlet of the temperature control pipeline, and the output end of the fourth electromagnetic valve is connected with the circulating pump.
Preferably, the invention also provides a test method for simulating gas mixing and diffusion by using the SF6 mixed insulating gas test device, which comprises the following steps:
1) vacuumizing the inside of the sealed tank by a vacuumizing device;
2) after vacuum pumping is finished, determining that SF6 gas is filled into the sealed tank from one of the gas inlets to a set pressure value through a vacuum meter, and starting a temperature control system to control the temperature of the gas in the sealed tank to a set value;
3) filling another gas into the sealed tank from other gas inlets at different positions to a set pressure value, and keeping the temperature and the pressure in the sealed tank unchanged;
4) detecting the mixing ratio of the SF6 and another gas in real time by using mixing ratio detectors on second interfaces at different positions until the mixing ratio detected by the mixing ratio detectors at each position is the same;
5) and drawing a three-dimensional model diagram of the SF6 and the gas concentration of another gas in the sealed tank along with the change of time according to the detection result, and the three-dimensional model diagram is used for simulating the diffusion and distribution of the gases when the equipment is filled with the mixed insulating gas and supplemented with the insulating gas.
6) The above steps were repeated, keeping the other conditions unchanged, and the gas temperatures tested in steps 2 and 3 were varied to study the effect of temperature on the mixed insulating gas mixing process.
Preferably, the invention also provides a test method for simulating the diffusion of SF6 decomposition products by using the SF6 mixed insulating gas test device, which comprises the following steps:
1) vacuumizing the inside of the sealed tank by a vacuumizing device;
2) after vacuum pumping is finished, filling SF6 mixed insulating gas with certain pressure and mixing ratio into the sealed tank from one of the air inlets through a vacuum meter, and controlling the temperature of the gas in the sealed tank to a set value through a temperature control system;
3) filling a certain amount of SF6 decomposition products into the sealed tank from air inlets at other different positions, and keeping the temperature and the pressure in the sealed tank unchanged;
4) detecting the concentration of SF6 decomposition products in the mixed insulating gas in real time by SF6 decomposition product detectors on second interfaces at different positions until the SF6 decomposition product detectors at each position detect that the data are not changed any more;
5) and calculating the diffusion rate and the diffusion path of the decomposition product of SF6 in the mixed gas according to the measured result, and simultaneously drawing a three-dimensional model diagram of the concentration of the decomposition product of SF6 in the sealed tank along with the change of time according to the measured result, wherein the three-dimensional model diagram is used for simulating the relationship between the diffusion rate of the decomposition product of SF6 in the mixed insulating gas and the detection time and the distance between the detection concentration of the decomposition product of the simulated fault point and the detection port when equipment fails to generate the decomposition product of SF 6.
6) The above steps were repeated, keeping the other conditions unchanged, and the gas temperatures tested in steps 2 and 3 were varied to study the effect of temperature on the diffusion process of SF6 decomposition products.
Preferably, the invention also provides a test method for simulating gas leakage of the SF6 mixed insulating gas test device, wherein a third interface for connecting a gas taking device is further arranged on the seal tank, and the test method comprises the following steps:
1) vacuumizing the inside of the sealed tank by a vacuumizing device;
2) after the vacuum pumping is finished, mixed insulating gas with certain pressure and mixing ratio is filled into the sealed tank from the air inlet through the vacuum meter, and the temperature of the gas in the sealed tank is controlled to a set value through the temperature control system;
3) respectively measuring the humidity and the gas mixing ratio of the gas in the sealed tank by a humidity sensor and a mixing ratio detector;
4) and (3) taking gas from the sealed tank at a certain flow rate through a gas taking device on the third interface, simulating that the sealed tank leaks gas outwards at a certain leakage rate, and then periodically detecting the gas mixing ratio in the sealed tank through a mixing ratio detector on the second interface at different positions, detecting the gas humidity in the sealed tank through a humidity sensor and detecting the gas pressure in the sealed tank through a pressure sensor until the gas pressure in the sealed tank is reduced to half of the original pressure, and stopping gas taking.
5) Comparing and analyzing the detection result in the step 4 and the detection result in the step 3 to obtain the influence of gas leakage on gas humidity and gas mixing ratio;
6) and (4) repeating the steps, changing the flow rate of gas taking of the gas taking device in the step (4), and simulating leakage of the sealed tank at different leakage rates, wherein the leakage rates are used for simulating the relationship among the leakage rate of the gas in the equipment, the gas humidity and the gas mixing ratio, so that the research on the influence of the gas leakage on the performance parameters of the SF6 mixed insulating gas is realized.
Preferably, the invention also provides a test method for simulating gas liquefaction by using the SF6 mixed insulating gas test device, wherein a liquid observation window for observing gas liquefaction in the sealed tank is further arranged at the bottom end of the sealed tank, and the temperature control system can control the temperature in the sealed tank to be-80-50 ℃ and comprises the following steps:
1) vacuumizing the inside of the sealed tank by a vacuumizing device;
2) after the vacuum pumping is finished, mixed insulating gas with certain pressure and mixing ratio is filled into the sealed tank from the air inlet through the vacuum meter, and the temperature of the gas in the sealed tank is controlled to a set value through the temperature control system;
3) cooling the sealed tank through a temperature control system, observing the liquefaction process of gas in a liquid observation window, detecting the temperature, the gas pressure, the gas mixing ratio and the gas concentration in the mixed insulating gas through a temperature sensor, a pressure sensor and a mixing ratio detector after the gas in the mixed insulating gas is liquefied, and then continuously cooling until the temperature cannot be reduced;
4) analyzing the gas liquefaction detection result to obtain the influence of gas liquefaction on gas pressure and gas mixing ratio;
5) and (3) repeating the steps, respectively changing the pressure or the mixing ratio of the mixed insulating gas in the step (2), and carrying out comparative analysis on the liquefied detection result of each gas, wherein the comparative analysis is used for simulating different mixing ratios of gases in equipment and the relation between different gas pressures and the liquefied temperature of the gases, so that the research on the influence of liquefaction on the performance parameters of the SF6 mixed insulating gas is realized.
6) And (3) repeating the steps, changing the cooling rate of the gas in the sealed tank by the temperature control system in the step (3), and simulating the influence of the rapid liquefaction of the gas on the performance parameters of the mixed insulating gas at different cooling rates.
Preferably, the invention also provides a test method for simulating adsorption of an adsorbent to gas of decomposition products of SF6 by using the SF6 mixed insulating gas test device, wherein an adsorbent window is further arranged on the sealed tank, and the test method comprises the following steps:
1) filling the adsorbent into the sealed tank from the adsorbent window;
2) vacuumizing the inside of the sealed tank by a vacuumizing device;
3) after the vacuum pumping is finished, mixed insulating gas with certain pressure and mixing ratio is filled into the sealed tank from the air inlet through the vacuum meter, and the temperature of the gas in the sealed tank is controlled to a set value through the temperature control system;
4) filling SF6 gas containing SF6 decomposition products with certain concentration into the sealed tank from one of the air inlets, simulating a failure point of equipment by using the air inlet, and detecting the SF6 decomposition products in the sealed tank regularly by using SF6 decomposition product detectors on second interfaces at different positions until the concentration of the SF6 decomposition products is not changed or the SF6 decomposition products cannot be detected, and finishing the detection;
5) analyzing the concentration detection result to obtain the relation of the concentration of the decomposition product of SF6 along with the change of time under the action of the adsorbent;
6) and (4) repeating the steps, changing the gas inlets filled with SF6 of the decomposition product of SF6 in the step (4), and then carrying out comparative analysis on the concentration detection result of each gas inlet after being filled with gas, wherein the comparative analysis is used for simulating the influence of the fault point, the detection point and the position of the adsorbent on the detection result of the decomposition product gas of SF 6.
Compared with the prior art, the invention has the beneficial effects that:
1. the research on the influence of different temperatures, gas pressures and gas types on the gas state of the mixed insulating gas and the diffusion of decomposition products is realized through a gas test system; the real-time temperature in the gas test system is controlled by the temperature control system, so that the temperature in the test process can be controlled and flexibly adjusted, temperature variables are provided for various simulations and researches, and the influence of the temperature on the test result is finally obtained; meanwhile, the intelligent detection control system can detect real-time data in the gas test system, and continuous monitoring of the test process is realized.
2. Through arranging the second interfaces connected with the mixing ratio detector or the SF6 decomposition product detector at different positions of the seal tank, the test process can be detected in a three-dimensional manner, and the spatial distribution condition of the required detection elements in the test system can be obtained.
3. Through the setting of adsorbent window, guarantee that the device can simulate the influence of equipment fault point, check point and adsorbent position to SF6 decomposition product gas detection result.
Drawings
Fig. 1 is a front view of an SF6 hybrid insulating gas testing apparatus according to a first embodiment of the present invention;
FIG. 2 is a rear view of a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a temperature control system according to an embodiment of the present invention;
fig. 4 is a rear view of a sixth embodiment of the present invention.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention for those skilled in the art, the technical solutions of the present invention will be further described with reference to the drawings attached to the specification.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless explicitly stated or limited otherwise, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Example one
Referring to fig. 1 and fig. 2, the embodiment discloses an SF6 mixed insulating gas testing apparatus, which includes a supporting platform 1, and a gas testing system 2, a temperature control system 3 and an intelligent detection control system 4 which are fixed on the supporting platform 1 through a bracket 5, wherein the gas testing system 2 is connected with the temperature control system 3 and the intelligent detection control system 4; the research on the influence of different temperatures, gas pressures and gas types on the gas state of the mixed insulating gas and the diffusion of decomposition products is realized through the gas test system 2; the real-time temperature in the gas test system 2 is controlled by the temperature control system 3, so that the temperature in the test process can be controlled and flexibly adjusted, temperature variables are provided for various simulations and researches, and the influence of the temperature on the test result is finally obtained; meanwhile, the intelligent detection control system 4 can detect real-time data in the gas test system 2, and continuous monitoring of the test process is achieved.
The gas test system 2 comprises a sealed tank 21, a temperature control pipeline 22, a vacuum meter 23, a liquid observation window 24 and a plurality of sensors, wherein the sealed tank 21 is fixed on the supporting platform 1 through a support 5, the temperature control pipeline 22 is arranged in the sealed tank 21, the inlet and the outlet of the temperature control pipeline 22 are connected with a temperature control system 3, the temperature of the temperature control pipeline 22 is changed through the temperature control system 3, and therefore the temperature of the sealed tank 21 is changed, and in the embodiment, the temperature control pipeline 22 is a spiral oil guide pipeline; the utility model discloses a gas mixing ratio detector or SF6 decomposition product detector (not shown) is including sealed jar 21, sealed jar 21 upper end is equipped with vacuum gauge 23, and the lower extreme is equipped with liquid observation window 24 that is arranged in observing the liquefaction of gas in sealed jar 21, the upper end of sealed jar 21, lower extreme and the front all are equipped with a plurality of sensors, the intelligent detection control system 4 is all connected to the sensor, still be equipped with a plurality of air inlets 211 on the sealed jar 21, be used for connecting the first interface 212 of evacuating device (not shown) and a plurality of second interface 213 that are used for connecting mixing ratio detector or SF6 decomposition product detector (not shown), air inlet 211, first interface 212 and second interface 213 all set up the different positions at sealed jar 21, simulate different gaseous mixing process from different positions through the air inlet 211 of a. The mixing ratio detector or the SF6 decomposition product detector is connected through the second interfaces 213 at different positions, so that the mixing ratio of the gas at different positions in the sealed tank 21 or the concentration of the SF6 decomposition product can be detected, and the comprehensiveness of the test is ensured; in addition, when the air inlet 211, the first interface 212 and the second interface 213 do not work, the air inlet is blocked by a thimble (not shown), so that the sealing performance and the operation convenience of each interface are kept; by providing the second interface 213 connected to the mixing ratio detector or the SF6 decomposition product detector at different positions of the sealed tank 21, the test process can be three-dimensionally tested, and the spatial distribution of the desired test elements in the test system 2 can be obtained.
The sensor includes a plurality of temperature sensor 25, pressure sensor 26 and humidity transducer 27, temperature sensor 25, pressure sensor 26 and humidity transducer 27 all set up the different positions on seal pot 21 and all are connected with intellectual detection system 4 electricity, not only can receive the signal that temperature sensor 25, pressure sensor 26 and humidity transducer 27 transmitted through intellectual detection system 4 and handle and obtain the testing result, can also control temperature sensor 25, pressure sensor 26 and humidity transducer 27's detection action, not only can detect the real-time data in the gas test system 2, can also realize the continuous monitoring to the experimentation.
Further, refer to fig. 3, temperature control system 3 includes heating branch 31, refrigeration branch 32, circulating pump 33 and control cabinet 34, heating branch 31 and refrigeration branch 32 are parallelly connected, the input and the temperature control pipeline 22 entry 221 intercommunication of heating branch 31 and refrigeration branch 32, the output is through circulating pump 33 and temperature control pipeline 22 export 222 intercommunication and form the return circuit, heating branch 31, refrigeration branch 32 and circulating pump 33 all connect control cabinet 34, control cabinet 34 is fixed in supporting platform 1 side, comes operation control temperature control system 3's heating or refrigeration through control cabinet 34.
Specifically, the heating branch 31 includes a first electromagnetic valve 311, a heating device 312 and a second electromagnetic valve 313, the first electromagnetic valve 311, the heating device 312 and the second electromagnetic valve 313 are all connected to a console 34 and sequentially communicated with one another through a pipeline (not labeled in the figure), an input end of the first electromagnetic valve 311 is connected to an inlet 221 of the temperature control pipeline 22, an output end of the second electromagnetic valve 313 is connected to a circulation pump 33, the refrigerating branch 32 includes a third electromagnetic valve 321, a primary refrigerating device 322, a secondary refrigerating device 323 and a fourth electromagnetic valve 324, the third electromagnetic valve 321, the primary refrigerating device 322, the secondary refrigerating device 323 and the fourth electromagnetic valve 324 are all connected to the console 34 and sequentially communicated with one another through a pipeline, an input end of the third electromagnetic valve 321 is connected to an inlet 221 of the temperature control pipeline 22, and an output end of the fourth electromagnetic valve 324 is connected to the circulation pump; the specific implementation process, the circulation pump 33 is started, through opening first solenoid valve 311 and second solenoid valve 313, close third solenoid valve 321 and fourth solenoid valve 324, utilize heating device 312 to realize the fluid heating and temperature rising in temperature-controlled pipeline 22, thereby realize the intensification to seal pot 21, it is same, through opening third solenoid valve 321 and fourth solenoid valve 324, close first solenoid valve 311 and second solenoid valve 313, utilize one-level refrigerating plant 322 and second grade refrigerating plant 323 to the fluid cooling in temperature-controlled pipeline 22, thereby realize the cooling to seal pot 21, and then realize adjusting the temperature in seal pot 21 in real time through temperature control system 3, provide temperature control and study the influence of temperature to the mist test for each experiment.
Further, liquid observation window 24 bottom still is equipped with drain 214 for carry out the blowdown to the sealed tank 21 after the experiment, the both ends and the top of sealed tank 21 all are equipped with the lug 215 that is used for lifting by crane, make things convenient for later stage hoist and mount.
Still further, the lower end of the supporting platform 1 is provided with idler wheels 11 used for moving along the directions of the four corner ends, so that the test device can be conveniently moved.
Example two
The embodiment discloses a test method for simulating gas mixing and diffusion by using the SF6 mixed insulating gas test device in the first embodiment, specifically taking SF6/N2 mixed gas as an example, the method comprises the following steps:
1) the inside of the airtight can 21 is evacuated by a vacuum evacuation device (not shown).
2) After the vacuum gauge 23 determines that the vacuum is completely pumped, SF6 gas is filled into the sealed tank 21 from one of the gas inlets 211 to a set pressure value, the temperature control system 3 is started to control the temperature of the gas in the sealed tank 21 to a set value, and the specific pressure and temperature are respectively transmitted to the intelligent detection control system 4 through the pressure sensor 26 and the temperature sensor 25 to be detected in real time, so that the set values of the pressure and the temperature are determined.
3) N2 is filled into the sealed tank 211 from the air inlets 211 at different positions to a set pressure value, and the temperature and the pressure in the sealed tank 211 are kept unchanged.
4) The mixing ratio of SF6 and N2 is detected in real time by the mixing ratio detectors on the second interface 213 at different positions, and the detection is finished until the mixing ratio detected by the mixing ratio detectors at each position is the same.
5) Drawing a three-dimensional model diagram of SF6 and N2 gas concentration changing with time in the seal tank 21 according to the detection result, and using the three-dimensional model diagram to simulate the diffusion and distribution conditions of the gas when the equipment is filled with mixed insulating gas and supplemented with the insulating gas, and determining the time required by the uniform mixing of the gas according to the diffusion and distribution conditions, thereby realizing the research on the gas mixing process in the new equipment after the gas filling of the new equipment or the gas supplementation.
6) The above steps were repeated, keeping the other conditions unchanged, and the gas temperatures tested in steps 2 and 3 were varied to study the effect of temperature on the mixed insulating gas mixing process.
EXAMPLE III
The embodiment discloses a test method for simulating diffusion of SF6 decomposition products by using the SF6 mixed insulating gas test device in the first embodiment, which is characterized in that: the method comprises the following steps:
1) the inside of the airtight can 21 is evacuated by a vacuum evacuation device.
2) Determining that SF6 mixed insulating gas with certain pressure and mixing ratio is filled into the sealed tank 21 from one of the air inlets 211 after vacuum pumping is finished through the vacuum meter 23, and controlling the temperature of the gas in the sealed tank 21 to a set value through the temperature control system 3; likewise, the specific pressure and temperature are respectively transmitted to the intelligent detection control system 4 through the pressure sensor 26 and the temperature sensor 25 to be detected in real time, so as to determine the set values of the pressure and the temperature.
3) The inside of the sealed tank is filled with a certain amount of decomposition products of SF6 from the air inlet 211 at other different positions, and the temperature and pressure inside the sealed tank 21 are kept constant.
4) The concentration of the SF6 decomposition product in the mixed insulating gas is detected in real time by the SF6 decomposition product detectors on the second interfaces 213 at different positions until the SF6 decomposition product detectors at each position detect that the data are not changed any more.
5) And calculating the diffusion rate and the diffusion path of the decomposition product of SF6 in the mixed gas according to the measured result, and simultaneously drawing a three-dimensional model diagram of the concentration of the decomposition product of SF6 in the sealed tank 21 along with the change of time according to the measured result, wherein the three-dimensional model diagram is used for simulating the relationship among the diffusion rate of the decomposition product of SF6 in the mixed insulating gas, the detection concentration of the decomposition product at the simulated fault point, the distance between detection ports and the detection time when the equipment fails to generate the decomposition product of SF 6.
6) The above steps were repeated, keeping the other conditions unchanged, and the gas temperatures tested in steps 2 and 3 were varied to study the effect of temperature on the diffusion process of SF6 decomposition products.
Example four
The embodiment discloses a test method for simulating gas leakage by using an SF6 mixed insulating gas test device, which is characterized in that: the sealed tank 21 is further provided with a third interface 214 for connecting a gas taking device (not shown), and the method comprises the following steps:
1) the inside of the airtight can 21 is evacuated by a vacuum evacuation device.
2) After the vacuum is completely pumped, the vacuum meter 23 determines that mixed insulating gas with certain pressure and mixing ratio is filled into the sealed tank 21 from one of the air inlets 211, and the temperature of the gas in the sealed tank 21 is controlled to a set value through the temperature control system 3; likewise, the specific pressure and temperature are respectively transmitted to the intelligent detection control system 4 through the pressure sensor 26 and the temperature sensor 25 to be detected in real time, so as to determine the set values of the pressure and the temperature.
3) The humidity of the gas in the sealed tank 21 is detected by the humidity sensor 27 sending a signal to the smart detection control system 4, and the gas mixing ratio in the sealed tank 21 is detected by the mixing ratio detector.
4) The gas is taken from the sealed tank 21 through the gas taking device on the third interface 214 at a certain flow rate, the gas leakage of the sealed tank 21 outwards at a certain leakage rate is simulated, then the gas mixing ratio in the sealed tank 21 is periodically detected through the mixing ratio detector on the second interface 213 at different positions, the humidity of the gas in the sealed tank 21 is detected through the humidity sensor 27, the gas pressure in the sealed tank 21 is detected through the pressure sensor 26, and the gas taking is stopped until the gas pressure in the sealed tank 21 is reduced to half of the original pressure.
5) Comparing and analyzing the detection result in the step 4 and the detection result in the step 3 to obtain the influence of gas leakage on gas humidity and gas mixing ratio;
6) and repeating the steps, changing the flow rate of gas taking of the gas taking device in the step 4, simulating leakage of the sealed tank 21 at different leakage rates, and simulating the relationship between the leakage rate of the gas in the equipment and the humidity and the mixing ratio of the gas to realize the research on the influence of the gas leakage on the performance parameters of the SF6 mixed insulating gas.
EXAMPLE five
The embodiment discloses a test method for simulating gas liquefaction by using the SF6 mixed insulating gas test device in the first embodiment, which is characterized in that: the temperature control system can control the temperature in the sealed tank to be-80-50 ℃ and is used for simulating the temperature range which can be met by equipment in use, and the method comprises the following steps:
1) the inside of the airtight can 21 is evacuated by a vacuum evacuation device.
2) After the vacuum is exhausted, mixed insulating gas with certain pressure and mixing ratio is filled into the sealed tank 21 from one of the air inlets 211 through the vacuum meter 23, and the temperature of the gas in the sealed tank is controlled to a set value through the temperature control system 3; likewise, the specific pressure and temperature are respectively transmitted to the intelligent detection control system 4 through the pressure sensor 26 and the temperature sensor 25 to be detected in real time, so as to determine the set values of the pressure and the temperature.
3) The temperature control system 3 is used for cooling the inside of the sealed tank 21, the liquefaction process of the gas is observed in the liquid observation window 24, after the gas in the mixed insulating gas is liquefied, the temperature sensor 25, the pressure sensor 26 and the mixing ratio detector are used for respectively detecting the gas temperature, the gas pressure and the gas mixing ratio at the moment, and then the temperature is continuously reduced until the temperature cannot be reduced.
4) Analyzing the gas liquefaction detection result to obtain the influence of gas liquefaction on gas pressure and gas mixing ratio;
5) and (3) repeating the steps, respectively changing the pressure or the mixing ratio of the mixed insulating gas in the step (2), and carrying out comparative analysis on the liquefied detection result of each gas, wherein the comparative analysis is used for simulating different mixing ratios of gases in equipment and the relation between different gas pressures and the liquefied temperature of the gases, so that the research on the influence of liquefaction on the performance parameters of the SF6 mixed insulating gas is realized.
6) And repeating the steps, changing the cooling rate of the gas in the sealed tank 21 by the temperature control system 3 in the step 3, simulating the influence of the rapid liquefaction of the gas on the performance parameters of the mixed insulating gas under different cooling rates, particularly under the condition of rapid cooling, and obtaining the reserved time for taking emergency treatment measures on the mixed insulating gas electrical equipment under the condition of rapid cooling from the detection result.
EXAMPLE six
Referring to fig. 4, the present embodiment discloses a test method for simulating adsorption of an adsorbent on a SF6 decomposition product gas by using the SF6 mixed insulating gas test apparatus described in the first embodiment, wherein the test method comprises the following steps: the back of the seal pot 21 is also provided with an adsorbent window 28 for placing an adsorbent, and the method comprises the following steps:
1) the adsorbent window 28 is filled with the adsorbent into the hermetic vessel 21.
2) The inside of the airtight can 21 is evacuated by a vacuum evacuation device.
3) After the vacuum is completely pumped, the vacuum meter 23 determines that mixed insulating gas with certain pressure and mixing ratio is filled into the sealed tank 21 from one of the air inlets 211, and the temperature of the gas in the sealed tank 21 is controlled to a set value through the temperature control system 3; likewise, the specific pressure and temperature are respectively transmitted to the intelligent detection control system 4 through the pressure sensor 26 and the temperature sensor 25 to be detected in real time, so as to determine the set values of the pressure and the temperature.
4) Filling SF6 gas containing a decomposition product of SF6 with a certain concentration into the sealed tank 21 from one of the gas inlets 211, simulating an equipment failure point by using the gas inlet 211, and detecting the decomposition product of SF6 in the sealed tank 21 regularly by using SF6 decomposition product detectors on second interfaces 213 at different positions until the concentration of the decomposition product of SF6 is not changed or the decomposition product of SF6 cannot be detected, and ending the detection;
5) analyzing the concentration detection result to obtain the relation of the concentration of the decomposition product of SF6 along with the change of time under the action of the adsorbent;
6) and (3) repeating the steps, changing the gas inlets 211 filled with SF6 of the decomposition product of SF6 in the step (4), and then carrying out comparative analysis on the concentration detection result of each gas inlet 211 after being filled with gas, wherein the comparative analysis is used for simulating the influence of the fault point, the detection point and the position of the adsorbent of equipment on the detection result of the decomposition product of SF 6.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The above-mentioned embodiments only represent embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the concept of the present invention, and these embodiments are all within the protection scope of the present invention.
Claims (9)
1. The utility model provides a SF6 mixed insulating gas test device which characterized in that: the gas testing system is connected with the temperature control system and the intelligent detection control system;
the gas test system comprises a seal tank, a temperature control pipeline, a vacuum meter and a plurality of sensors, wherein the temperature control pipeline is arranged in the seal tank, the inlet and outlet of the temperature control pipeline are connected with the temperature control system, the seal tank is provided with the vacuum meter and the sensors, the sensors are connected with an intelligent detection control system, the seal tank is also provided with a plurality of gas inlets, a first interface used for connecting a vacuumizing device and a plurality of second interfaces used for connecting a mixing ratio detector or an SF6 decomposition product detector, and the gas inlets, the first interface and the second interface are arranged at different positions on the seal tank;
the sensor includes temperature sensor, pressure sensor and humidity transducer, temperature sensor, pressure sensor and humidity transducer all set up the different positions on the seal pot and all are connected with the intellectual detection system electricity.
2. An SF6 hybrid insulating gas testing device as in claim 1, further comprising: temperature control system is including heating branch road, refrigeration branch road, circulating pump and control cabinet, it is parallelly connected with the refrigeration branch road to heat the branch road, the input and the temperature control pipeline entry intercommunication of branch road and refrigeration branch road heat, and the output passes through circulating pump and temperature control pipeline export intercommunication and forms the return circuit, it all connects the control cabinet to heat branch road, refrigeration branch road and circulating pump, the control cabinet is fixed in the supporting platform side.
3. An SF6 hybrid insulating gas testing device as in claim 2, wherein: the heating branch comprises a first electromagnetic valve, a heating device and a second electromagnetic valve, the first electromagnetic valve, the heating device and the second electromagnetic valve are all connected with a control console and are communicated through a pipeline in sequence, the input end of the first electromagnetic valve is connected with the inlet of a temperature control pipeline, and the output end of the second electromagnetic valve is connected with a circulating pump.
4. An SF6 hybrid insulating gas testing device as claimed in claim 3, wherein: the refrigeration branch comprises a third electromagnetic valve, a first-stage refrigeration device, a second-stage refrigeration device and a fourth electromagnetic valve, the third electromagnetic valve, the first-stage refrigeration device, the second-stage refrigeration device and the fourth electromagnetic valve are all connected with a control console and are communicated through a pipeline in sequence, the input end of the third electromagnetic valve is connected with the inlet of a temperature control pipeline, and the output end of the fourth electromagnetic valve is connected with a circulating pump.
5. A test method for simulating gas mixing and diffusion by using the SF6 hybrid insulating gas test apparatus of any of claims 1 to 4, wherein: the method comprises the following steps:
1) vacuumizing the inside of the sealed tank by a vacuumizing device;
2) after vacuum pumping is finished, determining that SF6 gas is filled into the sealed tank from one of the gas inlets to a set pressure value through a vacuum meter, and starting a temperature control system to control the temperature of the gas in the sealed tank to a set value;
3) filling another gas into the sealed tank from other gas inlets at different positions to a set pressure value, and keeping the temperature and the pressure in the sealed tank unchanged;
4) detecting the mixing ratio of the SF6 and another gas in real time by using mixing ratio detectors on second interfaces at different positions until the mixing ratio detected by the mixing ratio detectors at each position is the same;
5) and drawing a three-dimensional model diagram of the SF6 and the gas concentration of another gas in the sealed tank along with the change of time according to the detection result, and the three-dimensional model diagram is used for simulating the diffusion and distribution of the gases when the equipment is filled with the mixed insulating gas and supplemented with the insulating gas.
6) The above steps were repeated, keeping the other conditions unchanged, and the gas temperatures tested in steps 2 and 3 were varied to study the effect of temperature on the mixed insulating gas mixing process.
6. A test method for simulating the diffusion of decomposition products of SF6 using an SF6 hybrid insulating gas test apparatus as set forth in any of claims 1 to 4, wherein: the method comprises the following steps:
1) vacuumizing the inside of the sealed tank by a vacuumizing device;
2) after vacuum pumping is finished, filling SF6 mixed insulating gas with certain pressure and mixing ratio into the sealed tank from one of the air inlets through a vacuum meter, and controlling the temperature of the gas in the sealed tank to a set value through a temperature control system;
3) filling a certain amount of SF6 decomposition products into the sealed tank from air inlets at other different positions, and keeping the temperature and the pressure in the sealed tank unchanged;
4) detecting the concentration of SF6 decomposition products in the mixed insulating gas in real time by SF6 decomposition product detectors on second interfaces at different positions until the SF6 decomposition product detectors at each position detect that the data are not changed any more;
5) and calculating the diffusion rate and the diffusion path of the decomposition product of SF6 in the mixed gas according to the measured result, and simultaneously drawing a three-dimensional model diagram of the concentration of the decomposition product of SF6 in the sealed tank along with the change of time according to the measured result, wherein the three-dimensional model diagram is used for simulating the relationship between the diffusion rate of the decomposition product of SF6 in the mixed insulating gas and the detection time and the distance between the detection concentration of the decomposition product of the simulated fault point and the detection port when equipment fails to generate the decomposition product of SF 6.
6) The above steps were repeated, keeping the other conditions unchanged, and the gas temperatures tested in steps 2 and 3 were varied to study the effect of temperature on the diffusion process of SF6 decomposition products.
7. A test method for simulating gas leakage by using the SF6 hybrid insulating gas test apparatus as claimed in any of claims 1 to 4, wherein: still be equipped with the third interface that is used for connecting the device of getting gas on the seal pot, include the following step:
1) vacuumizing the inside of the sealed tank by a vacuumizing device;
2) after the vacuum pumping is finished, mixed insulating gas with certain pressure and mixing ratio is filled into the sealed tank from the air inlet through the vacuum meter, and the temperature of the gas in the sealed tank is controlled to a set value through the temperature control system;
3) respectively measuring the humidity and the gas mixing ratio of the gas in the sealed tank by a humidity sensor and a mixing ratio detector;
4) and (3) taking gas from the sealed tank at a certain flow rate through a gas taking device on the third interface, simulating that the sealed tank leaks gas outwards at a certain leakage rate, and then periodically detecting the gas mixing ratio in the sealed tank through a mixing ratio detector on the second interface at different positions, detecting the gas humidity in the sealed tank through a humidity sensor and detecting the gas pressure in the sealed tank through a pressure sensor until the gas pressure in the sealed tank is reduced to half of the original pressure, and stopping gas taking.
5) Comparing and analyzing the detection result in the step 4 and the detection result in the step 3 to obtain the influence of gas leakage on gas humidity and gas mixing ratio;
6) and (4) repeating the steps, changing the flow rate of gas taking of the gas taking device in the step (4), and simulating leakage of the sealed tank at different leakage rates, wherein the leakage rates are used for simulating the relationship among the leakage rate of the gas in the equipment, the gas humidity and the gas mixing ratio, so that the research on the influence of the gas leakage on the performance parameters of the SF6 mixed insulating gas is realized.
8. A test method for simulating gas liquefaction by using the SF6 hybrid insulating gas test apparatus of any of claims 1 to 4, wherein: the bottom end of the seal tank is also provided with a liquid observation window for observing the liquefaction of the gas in the seal tank, and the temperature control system can control the temperature in the seal tank to be-80-50 ℃, and the method comprises the following steps:
1) vacuumizing the inside of the sealed tank by a vacuumizing device;
2) after the vacuum pumping is finished, mixed insulating gas with certain pressure and mixing ratio is filled into the sealed tank from the air inlet through the vacuum meter, and the temperature of the gas in the sealed tank is controlled to a set value through the temperature control system;
3) cooling the sealed tank through a temperature control system, observing the liquefaction process of gas in a liquid observation window, detecting the temperature, the gas pressure, the gas mixing ratio and the gas concentration in the mixed insulating gas through a temperature sensor, a pressure sensor and a mixing ratio detector after the gas in the mixed insulating gas is liquefied, and then continuously cooling until the temperature cannot be reduced;
4) analyzing the gas liquefaction detection result to obtain the influence of gas liquefaction on gas pressure and gas mixing ratio;
5) and (3) repeating the steps, respectively changing the pressure or the mixing ratio of the mixed insulating gas in the step (2), and carrying out comparative analysis on the liquefied detection result of each gas, wherein the comparative analysis is used for simulating different mixing ratios of gases in equipment and the relation between different gas pressures and the liquefied temperature of the gases, so that the research on the influence of liquefaction on the performance parameters of the SF6 mixed insulating gas is realized.
6) And (3) repeating the steps, changing the cooling rate of the gas in the sealed tank by the temperature control system in the step (3), and simulating the influence of the rapid liquefaction of the gas on the performance parameters of the mixed insulating gas at different cooling rates.
9. A test method for simulating adsorption of SF6 decomposition product gas by adsorbent using SF6 hybrid insulating gas test apparatus as defined in any of claims 1 to 4, wherein: the sealing tank is also provided with an adsorbent window, and the method comprises the following steps:
1) filling the adsorbent into the sealed tank from the adsorbent window;
2) vacuumizing the inside of the sealed tank by a vacuumizing device;
3) after the vacuum pumping is finished, mixed insulating gas with certain pressure and mixing ratio is filled into the sealed tank from the air inlet through the vacuum meter, and the temperature of the gas in the sealed tank is controlled to a set value through the temperature control system;
4) filling SF6 gas containing SF6 decomposition products with certain concentration into the sealed tank from one of the air inlets, simulating a failure point of equipment by using the air inlet, and detecting the SF6 decomposition products in the sealed tank regularly by using SF6 decomposition product detectors on second interfaces at different positions until the concentration of the SF6 decomposition products is not changed or the SF6 decomposition products cannot be detected, and finishing the detection;
5) analyzing the concentration detection result to obtain the relation of the concentration of the decomposition product of SF6 along with the change of time under the action of the adsorbent;
6) and (4) repeating the steps, changing the gas inlets filled with SF6 of the decomposition product of SF6 in the step (4), and then carrying out comparative analysis on the concentration detection result of each gas inlet after being filled with gas, wherein the comparative analysis is used for simulating the influence of the fault point, the detection point and the position of the adsorbent on the detection result of the decomposition product gas of SF 6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113252773A (en) * | 2021-02-25 | 2021-08-13 | 国网内蒙古东部电力有限公司检修分公司 | Liquefaction temperature test measuring device and method for SF6 gas and mixed insulating gas thereof |
| CN113970587A (en) * | 2021-10-22 | 2022-01-25 | 南方电网科学研究院有限责任公司 | Improved insulation structure suitable for environment-friendly GIT |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252773A (en) * | 2021-02-25 | 2021-08-13 | 国网内蒙古东部电力有限公司检修分公司 | Liquefaction temperature test measuring device and method for SF6 gas and mixed insulating gas thereof |
| CN113970587A (en) * | 2021-10-22 | 2022-01-25 | 南方电网科学研究院有限责任公司 | Improved insulation structure suitable for environment-friendly GIT |
| CN113970587B (en) * | 2021-10-22 | 2024-02-13 | 南方电网科学研究院有限责任公司 | Improved insulation structure suitable for environment-friendly GIT |
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