CN108760796A - A kind of insulating gas condensing temperature test device and method based on Schering bridge - Google Patents
A kind of insulating gas condensing temperature test device and method based on Schering bridge Download PDFInfo
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Abstract
The invention discloses a kind of insulating gas condensing temperature test device and method based on Schering bridge, including：Insulating box, constant volume bottle, electrode to, air distributing device, liquid-phase detection device and data monitoring processing unit；Constant volume bottle is set in insulating box, and thermometer and pressure gauge are provided in constant volume bottle；To being arranged in the bottle wall of constant volume bottle, the discharge end of electrode pair is located in constant volume bottle electrode, and electrode alignment is in the both ends connection high voltage power supply forming circuit outside constant volume bottle；Liquid-phase detection device includes Schering bridge；The test side of Schering bridge is set in constant volume bottle；Air distributing device is connected with constant volume bottle；Thermometer, pressure gauge, insulating box, air distributing device and liquid-phase detection device are connected by signal wire with data monitoring processing unit respectively.The test device of the present invention can overcome based on approximate sex chromosome mosaicism existing for equation for ideal gases calculated value, can on-the-spot test insulating gas condensing temperature and verification.
Description
Technical field
The present invention relates to insulating gas physicochemical property detection technique fields, and in particular to a kind of insulation based on Schering bridge
Gas liquefaction temperature testing device and method.
Background technology
It is run with the Large scale construction of high pressure, super-pressure, extra-high voltage grid, combined metal confining gas insulation electrical
Equipment：Obtaining for Cubicle Gas-Insulated Switchgear (GIS) and gas-insulated metal closed power transmission line (GIL) is extensive
Using, wherein GIS device is put into operation use with annual 40% growth rate, in GIS device as primary insulation gas six
Sulfur fluoride (SF6) be widely used.SF6With strong greenhouse effects, atmospheric lifetime is up to 3200, and greenhouse effects are two
2.39 ten thousand times of carbonoxide are classified as one of six kinds of greenhouse gases of limiting emission by international community, and China is in Paris Climate Conference
On make a promise, greenhouse gas emission will be gradually decreased.
Currently, combined metal confining gas insulation electrical equipment reduces SF6There are two types of the approach used：One is with nitrogen
Gas partial alternative SF6, with SF6It is used in mixed way；Another is that the completely new insulating gas of exploitation substitutes SF completely6Use.
GIS or GIL electrical equipments in use, with the reduction of environment temperature, the SF in GIS or GIL6Gas by
Unsaturated steam becomes saturated vapor, but SF6Density is constant；If environment temperature further decreases, SF6Start to coagulate
Phenomenon is tied, at this time SF6Density reduces, GIS or GIL insulation of electrical installation abilities are begun to decline, and temperature at this time is SF6Liquefaction
Temperature.Current problem is：In partial alternative or replacing whole SF6In the research and application of gas, discovery has replacement SF6's
The boiling point of the insulating gas of potential low temperature chamber effect generally compares SF6Boiling point it is high.To avoid having in the insulating gas developed
There is above-mentioned liquefaction phenomenon in use in a little high boiling components, it is necessary to control its component ratio, make environmentally friendly insulating gas
Environmental-protecting performance and insulation performance can be taken into account, the accurate condensing temperature for measuring environmentally friendly insulating gas is very necessary, lacks at present a kind of
The device and method of the condensing temperature of novel environment friendly insulating gas can accurately be measured.
Invention content
The purpose of the present invention is to provide a kind of insulating gas condensing temperature test device and method based on Schering bridge,
To solve above-mentioned technical problem.The insulating gas condensing temperature test device of the present invention can accurately measure environmental protection
The condensing temperature of insulating gas, it is easy to operate intuitive, it can either overcome based on close existing for equation for ideal gases calculated value
Like sex chromosome mosaicism, and it can overcome the problems, such as that on-the-spot test condensing temperature can not be verified.
In order to achieve the above objectives, the present invention uses following technical scheme：
A kind of insulating gas condensing temperature test device based on Schering bridge, including：Insulating box, constant volume bottle, electrode to,
Air distributing device, liquid-phase detection device and data monitoring processing unit；The temperature range of insulating box is adjustable, and constant volume bottle is set to constant temperature
In case, thermometer and pressure gauge are provided in constant volume bottle, thermometer and pressure gauge are respectively used to measure the temperature of gas in constant volume bottle
Degree and pressure；Electrode is to being arranged in the bottle wall of constant volume bottle, and the discharge end of electrode pair is located in constant volume bottle, and electrode alignment is in constant volume
Bottle outside both ends connection high voltage power supply forming circuit, high voltage power supply be electrode to provide voltage can puncture it is to be measured in constant volume bottle
Insulating gas；The lower end of constant volume bottle is provided with liquid-phase detection device, and liquid-phase detection device includes Schering bridge；The inspection of Schering bridge
End is surveyed to be set in constant volume bottle, can be detected by Schering bridge insulating gas gas phase or liquid phase to be measured in constant volume bottle electricity be situated between it is normal
Number；Air distributing device is connected with constant volume bottle, can be injected the insulating gas to be measured of preparation in constant volume bottle by air distributing device；Temperature
Degree table, pressure gauge, insulating box, air distributing device and Schering bridge are connected by signal wire with data monitoring processing unit respectively,
Information exchange can be completed with data monitoring processing unit.
Further, the lower part of constant volume bottle is provided with sample tap, can be to the insulation to be measured in constant volume bottle by sample tap
Gas is sampled.
Further, the temperature regulating range of insulating box is 203.0K~423.0K.
Further, high voltage power supply is high-voltage DC power supply or high-voltage ac power.
Further, constant volume bottle is made of metal material, and the madial wall of the cavity of the constant volume in constant volume bottle is smooth
The upper and lower end of curved surface, constant volume bottle is hemispherical.
Further, liquid-phase detection device further includes optical fiber scene processing unit；Optical fiber scene processing unit and constant volume bottle
It is connected, the liquid generated in constant volume bottle can be collected；The signal output end of optical fiber scene processing unit is handled with data monitoring
The signal receiving end of unit is connected.
Further, air distributing device includes air pump and mass flow controller；Air pump passes through gas pipeline and constant volume bottle
Inside is connected, and mass flow controller is arranged on the component gas conveyance conduit for forming insulating gas to be measured, component gas
Conveyance conduit is connected with the inside of constant volume bottle.
Further, mass flow controller and component gas conveyance conduit are 3, and each mass flow controller is set
It sets on a corresponding component conveyance conduit.
Further, data monitoring processing unit includes data acquisition module, control module and touches display operation screen, is counted
According to acquisition module, control module and the interconnection of display operation screen is touched, information exchange can be carried out；Thermometer, pressure gauge and
The signal output end of Schering bridge is connected with the signal receiving end of the data acquisition module of data monitoring processing unit respectively, number
Signal output end according to the control module of monitoring processing unit is connected with the signal receiving end of insulating box and air distributing device respectively.
A kind of insulating gas condensing temperature test method based on Schering bridge is based on any of the above-described kind of test device, packet
Include step in detail below：
Step 1, the insulation gas to be measured that air distributing device injects preparation into constant volume bottle is controlled by data monitoring processing unit
Body；
Step 2, the temperature that insulating box is controlled to adjust by data monitoring processing unit makes the insulation gas prepared in constant volume bottle
The temperature of body reaches preset value；
Step 3, the pressure of the insulating gas after being disposed by pressure gauge acquisition step 2, and real-time pressure value is passed
Pass data monitoring processing unit record；
Step 4, the breakdown voltage and dielectric constant of the insulating gas after testing procedure 2 is disposed simultaneously record test number
According to；
Step 5, step 2-4 is repeated, until being completed preset temperature range；Data will be obtained and carry out check analysis,
Obtain the condensing temperature of test insulating gas.
Compared with prior art, the invention has the advantages that：
The insulating gas condensing temperature test device of the present invention provides constant volume by constant volume bottle, by changing insulating box
Temperature adjust constant volume bottle in insulating gas to be measured temperature, by electrode to test preset temperature and pressure under insulation gas to be measured
The breakdown voltage of body is prepared by air distributing device and prepares insulating gas according to default component ratio and inject in constant volume bottle, passed through
Schering bridge tests insulating gas dielectric constant, and the liquid of insulating gas can be tested by the variation of breakdown voltage and dielectric constant
Change temperature.The test device of the present invention overcomes based on approximate sex chromosome mosaicism existing for equation for ideal gases calculated value, overcomes existing
Field test condensing temperature can not validation problem；Gather the strong test method of two kinds of operability and carries out mutual validation test data
Accuracy, tested by selection criteria sample gas, draw correlation curve database and be simultaneously stored in data monitoring processing unit, carry out quilt
The one or more parameter testings of sample, other parameters can be obtained by standard curve data Auto-matching, have operation letter
The advantages that single, efficient and convenient, sample recycling, environmental protection.
Further, insulating gas to be measured is sampled by sample tap, it can be further by analyzing sample component
Validation test is as a result, further enhance the accuracy and reliability of device to test.
Further, the madial wall of constant volume bottle is that smooth surface flows into optical fiber under gravity convenient for the liquid phase generated
Scene processing unit.
Further, the case where insulating gas liquid phase generates is observed by optical fiber scene processing unit, can analyzed to be measured
The condensing temperature of insulating gas can further verify test result, the accuracy and reliability of intensifier test.
Further, constant volume bottle can be vacuumized by air pump, enhances the accuracy of test；Pass through mass flow
Controller controls the addition of each component gas, and proportioning Accuracy Error is smaller, can obtain the insulation gas to be measured accurately matched
Body.
Further, the real time temperature of the insulating gas to be measured of thermometer and gauge measurement and pressure can pass through in real time
Data monitoring processing unit shows that, convenient for obtaining information data in real time, the test result of Schering bridge can be supervised by data in real time
Control processing unit shows convenient for obtaining in time and recording experimental result data；It can be according to default by data monitoring processing unit
The temperature change for controlling insulating box can control air distributing device by data monitoring processing unit and prepare insulation to be measured according to default
Gas, easy to operate, experimental result intuitive display.
The present invention method solve production in physical presence test problem, can be used in insulating gas engineer application and
The gas-liquid two-phase transition problem that experimental study is related to, and testing efficiency and accuracy are higher, it is easy to operate.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, not
Constitute the restriction to the embodiment of the present invention.
Fig. 1 is a kind of overall structure signal of insulating gas condensing temperature test device based on Schering bridge of the present invention
Figure；
Fig. 2 is a kind of overall structure diagram for insulating gas condensing temperature test device of the embodiment of the present invention；
Fig. 3 is the partial enlargement structural representation at A in Fig. 2；
Fig. 4 is a kind of two dimensional surface P-T curve graphs of embodiment of the present invention；
Fig. 5 is the two dimensional surface P-T curve graphs of another embodiment of the present invention；
In figs. 1 to 3,1 insulating box；2 constant volume bottles；3 electrodes pair；4 thermometers；5 pressure gauges；6 air distributing devices；7 samplings
Mouthful.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiment, the present invention is made
Further to be described in detail, exemplary embodiment of the invention and its explanation are only used for explaining the present invention, are not intended as to this
The restriction of invention.
With reference to figure 1, a kind of insulating gas condensing temperature test device based on Schering bridge of the invention, including：Constant temperature
Case 1, constant volume bottle 2, electrode pair 3, air distributing device 6, liquid-phase detection device and data monitoring processing unit.
The temperature range of insulating box 1 is adjustable, and the temperature regulating range of insulating box 1 is 203.0K~423.0K.
Constant volume bottle 2 is set in insulating box 1, and thermometer 4 and pressure gauge 5, thermometer 4 and pressure are provided in constant volume bottle 2
Table 5 is respectively used to measure the temperature and pressure of gas in constant volume bottle 2；Constant volume bottle 2 is made of metal material, the perseverance in constant volume bottle 2
The madial wall for determining the cavity of volume is smooth surface, and the upper and lower end of constant volume bottle 2 is hemispherical.The lower part of constant volume bottle 2 is provided with
Sample tap 7 can be sampled the insulating gas to be measured in constant volume bottle 2 by sample tap 7.
Electrode pair 3 is arranged in the bottle wall of constant volume bottle 2, and the discharge end of electrode pair 3 is located in constant volume bottle 2, and electrode pair 3 is located at
Both ends connection high voltage power supply forming circuit outside constant volume bottle 2, high voltage power supply provides voltage for electrode pair 3 can puncture constant volume bottle 2
Interior insulating gas to be measured, high voltage power supply are high-voltage DC power supply or high-voltage ac power；The lower end of constant volume bottle 2 is provided with liquid phase
Detection device, liquid-phase detection device include Schering bridge；The test side of Schering bridge is set in constant volume bottle 2, passes through XiLin electricity
Bridge can detect the dielectric constant of insulating gas gas phase or liquid phase to be measured in constant volume bottle 2.Air distributing device 6 is connected with constant volume bottle 2,
The insulating gas to be measured of preparation can be injected in constant volume bottle 2 by air distributing device 6；Thermometer 4, insulating box 1, is matched at pressure gauge 5
Device of air 6 and Schering bridge are connected by signal wire with data monitoring processing unit respectively, and the device of above-mentioned connection can
Information exchange is completed with data monitoring processing unit.
Air distributing device 6 includes air pump and mass flow controller；Air pump is connected by gas pipeline with the inside of constant volume bottle 2
Logical, mass flow controller is arranged on the component gas conveyance conduit for forming insulating gas to be measured, component gas conveyance conduit
It is connected with the inside of constant volume bottle 2.Mass flow controller and component gas conveyance conduit are 3, each mass flow control
Device processed is arranged on a corresponding component conveyance conduit.
Data monitoring processing unit includes data acquisition module, control module and touch display operation screen, data acquisition module
Block, control module and touch display operation screen are connected with each other, and can carry out information exchange；Thermometer 4, pressure gauge 5 and XiLin electricity
The signal output end of bridge is connected with the signal receiving end of the data acquisition module of data monitoring processing unit respectively, data monitoring
The signal output end of the control module of processing unit is connected with the signal receiving end of insulating box 1 and air distributing device 6 respectively.
Referring to figs. 2 and 3, a kind of insulating gas condensing temperature test device based on Schering bridge of the invention, including：
Insulating box 1, constant volume bottle 2, electrode pair 3, air distributing device 6, liquid-phase detection device and data monitoring processing unit.
Constant volume bottle 2 is hung in insulating box 1, and thermometer 4 and pressure gauge 5, thermometer 4 and pressure are provided in constant volume bottle 2
Table 5 is installed by the mounting hole in 2 bottle wall of constant volume bottle respectively so that thermometer 4 and pressure gauge 5 can extend into constant volume bottle 2, temperature
Degree table 4 is used to measure the real time temperature of 2 interior insulation gas of constant volume bottle, and pressure gauge 5 is used to measure the reality of 2 interior insulation gas of constant volume bottle
When pressure.Thermometer 4 is arranged at the middle part of constant volume bottle 2, and pressure gauge 5 is arranged on the top of constant volume bottle 2.Constant volume bottle 2 is under
The position at end is provided with thief hatch, and thief hatch is used to acquire the insulating gas sample in constant volume bottle 2, by the component for detecting sample
The accuracy and reliability of device can be improved to the verification of test result.
Electrode pair 3 is arranged in the bottle wall of constant volume bottle 2, and the discharge end of electrode pair 3 is located at the middle part in constant volume bottle 2, electrode
It is located at the both ends outside constant volume bottle 2 to 3 and is connected with high voltage power supply.When high voltage power supply provides enough voltage, electrode pair 3 can puncture
Insulating gas in constant volume bottle 2；When insulation breakdown occurs, high voltage power supply, electrode pair 3 and insulating gas can be formed into a loop；When
When can puncture, condensing temperature is as reached.
The lower end of constant volume bottle 2 is provided with liquid-phase detection device, and liquid-phase detection device includes but not limited to Schering bridge and light
Fine scene processing unit.The test side of Schering bridge is set in constant volume bottle 2, by testing the dielectric constant of liquid phase, is detected
In gas-liquid two-phase change procedure when the variation of dielectric constant, condensing temperature is as reached；Optical fiber scene processing unit is using saturating
Liquid phase harvester made of bright material, liquid phase harvester are connected to constant volume bottle 2, and the liquid phase generated in constant volume bottle 2 can be into
Enter liquid phase harvester, when observing that liquid phase harvester is collected into liquid phase scene, as reaches condensing temperature.It is above-mentioned each
The information of device is both provided with corresponding information sensor and is monitored in real time.
Temperature in insulating box 1 is adjustable, and can stablize in each temperature value adjusted, and temperature regulating range is
203.0K~423.0K.Constant volume bottle 2 includes but not limited to using the cavity of the constant volume of metal material manufacture, internal presentation
Dome-type is presented in smooth surface, especially upper and lower port, and when changing so as to gas-liquid two-phase, the liquid of generation is under the effect of gravity
It quickly slides to 2 bottom of constant volume bottle and enters liquid-phase detection device.
Air distributing device 6 includes that mating air pump and 3 mass flow controllers, air pump pass through gas pipeline and constant volume bottle 2
It is connected, constant volume bottle 2 can be vacuumized by air pump, can ensures the feature of environmental protection of test.Constant volume bottle 2 is defeated by 3 components
Feed channel is connected with 3 kinds of component gas storage devices respectively, and a mass flow control is respectively provided on every component gas pipeline
Device processed controls the amount that each component gas is passed through constant volume bottle 2 by mass flow controller, can realize that a variety of accuracies are higher
Component proportion, work efficiency is high, simple operation, can complete the gas injection of constant volume bottle 2 by air distributing device 6, be vented, vacuumizes
It is recycled with by sample compression.
Data monitoring processing unit includes but not limited to by data acquisition module, control module, touch screen, visualization procedure
If fixed sum data transmission module.Thermometer 4, pressure gauge 5, insulating box 1, air distributing device 6 and liquid-phase detection device pass through signal
Line is connected with data monitoring processing unit, can complete information exchange with data monitoring processing unit.Thermometer 4, pressure
The signal output end of table 5, the Schering bridge and optical fiber scene processing unit signal receiving end with data monitoring processing unit respectively
Be connected, data monitoring processing unit include can screen, thermometer 4, pressure gauge 5, Schering bridge and optical fiber scene processing unit
Real time information pass to after data monitoring processing unit by can screen real-time display.The signal of data monitoring processing unit is defeated
Outlet is connected with the signal receiving end of insulating box 1, air pump and each mass flow controller respectively, is handled by data monitoring
Unit is capable of the real time temperature of regulating thermostatic case 1, can control the operating status of air pump, can control each mass flow control
Open and close, uninterrupted and the run time of device.After data monitoring processing unit collects temperature and pressure data, control can be passed through
The distribution formula of the variation and air distributing device 6 of pre-set programs control 1 temperature of insulating box of molding block, can also be carried out by touch screen
Artificial real-time control enhances the reliability of device；It can set with atmospheric pressure in the control module of data monitoring processing unit, match
Gas ratio, 1 temperature bound of insulating box, test loop number, data record, Drawing of Curve, data regression credibility interval
Setting.AC or DC voltage can be loaded to electrode pair 3, test insulating gas breakdown voltage value by high voltage power supply.
The test device of the present invention injects insulating gas to be tested to constant volume bottle 2 by air distributing device 6, sets insulating box
1 temperature measures the pressure of insulating gas, surveys when 2 built-in electrical insulation gas temperature of constant volume bottle is consistent with external 1 temperature of insulating box
The AC/DC breakdown voltage of amount insulating gas is measured from the component of 7 sampling and measuring insulating gas of sample tap by Schering bridge
The dielectric constant of insulating gas observes and records scene of the insulating gas from gas phase to liquid-phase conversion when, according to preset temperature range
1 temperature of regulating thermostatic case, repeats the above process.The device of the invention is based on the temperature of insulating gas to be measured, pressure in constant volume bottle 2
Power, breakdown voltage, component, dielectric constant and the related 2 d plane picture of liquefaction scene structure or linear equation, it is exhausted can to analyze calculating
The condensing temperature of edge gas at different temperatures.
A kind of insulating gas condensing temperature test method based on Schering bridge, based on the test device of the present invention, specifically
Step includes：
Step 1, constant volume bottle 2 is vacuumized using air pump, according to default proportioning, is matched by the control of data monitoring processing unit
The gas injection into constant volume bottle 2 of device of air 6；When controlling flow and the conveying of respective components gas by each mass flow controller
Between, each component gas closes corresponding mass flow controller after being delivered to preset value；
Step 2, the temperature that insulating box 1 is controlled to adjust by data monitoring processing unit makes the insulation prepared in constant volume bottle 2
The temperature of gas reaches preset value；
Step 3, the pressure of the insulating gas after being disposed by 5 acquisition step 2 of pressure gauge, and real-time pressure value is passed
Pass data monitoring processing unit record；
Step 4, the breakdown voltage of insulating gas, acquisition insulating gas sample and fractions tested are tested, insulating gas is tested
Dielectric constant, the liquid phase in observation constant volume bottle 22 generates situation；
Step 5, step 2 is repeated to 4, and test is carried out to insulating gas in different temperature until preset temperature range is whole
It is completed, and records test data；
Step 6, test data step 5 obtained carries out check analysis, obtains the test result of insulating gas.
Data analysing method specifically includes following several method in step 6：
(1) using pressure as abscissa, temperature is that ordinate draws two dimensional surface curve graph, and inflection point occurs in regression analysis curve
The saturated vapor pressure being worth under the insulating gas relevant temperature that corresponding temperature and pressure is tested.
(2) data linear equation is chosen in segmentation since high-temperature numerical value is to low temperature numerical value, until linear equation
Correlation when being less than desired value or setting value, corresponding temperature and pressure data are the beginning gas-liquid of tested insulating gas
The maximum temperature of two inversion of phases and the saturated vapor pressure under relevant temperature.
(3) using breakdown voltage as abscissa, temperature and pressure is ordinate, draws 2 d plane picture, and curve graph is resistance to from height
Pressure numerical value turns to the beginning gas-liquid two-phase that corresponding temperature and pressure at low pressure-resistant numeric data gradual change is tested insulating gas
The maximum temperature of change and the saturated vapor pressure under relevant temperature.
(4) gas component ratio, temperature, pressure data are based on and carries out data analysis, using gas component as abscissa, temperature
It is that ordinate draws 2 d plane picture with pressure, curve graph is corresponded to from high component ratio numerical value to low component ratio data gradual change place
Temperature and pressure be tested insulating gas start gas-liquid two-phase conversion maximum temperature and relevant temperature under saturation steam
Vapour pressure.
(5) proportioning, temperature, pressure, breakdown voltage, dielectric constant, liquid phase scene, group is based on to grade to form insulating gas phase
Closing property database, the others that gas is tested according to one or more given data resolving inverselies of tested gas are one or more
Data.
(6) it can configure standard sample gas to be tested, draw correlation curve, preserved to data monitoring as Standard Curve Database
Manage unit, tested insulating gas only test multinomial data one can go out other data by standard curve Data Matching, carry
High testing efficiency and the accuracy of test.
The principle of test method is：The insulating gas of certain molar weight n, n=n1+n2, n1 gas phase portion moles, n2 are
Liquid phase part mole, n=n1, n2=0 when initial, in constant volume V, the pressure P of insulating gas is approximate with temperature T presentations
Linear relationship, i.e. approximate ideal gas equation P*V=n1*R*T, R are ideal gas constant, and density p=M*n1/V, M is exhausted
The molal weight of edge gas；When V is constant, when temperature T is reduced, P is decreased, and n1 and ρ are constant, the insulating capacity K of insulating gas
With density positive correlation, therefore insulating capacity is also constant；When temperature T is further decreased, insulating gas will be from gas phase to liquid phase
Conversion, n1 values will reduce at this time, and insulating capacity K is reduced；N2 becomes larger from 0, and liquid phase occurs, and passes through Schering bridge and optical fiber measurement
Its dielectric constant e and refractive index k continues to reduce T, P continues to reduce, more it was determined that P values are saturated vapor pressure at this temperature
More gas phase conversions continue to reduce at liquid phase, n1 values, and insulating capacity K continues to decline, and n2 continues to increase, and liquid phase more occurs, and continue
Its dielectric constant e and refractive index k are measured, or shooting record liquid phase generates scene；The two-dimensional curve of P and T is drawn, or draws n and T
Two-dimensional curve, or draw K and T two-dimensional curve；Inflection point is observed by these curves or is fitted equation, can find out liquid
What temperature T, pressure P, insulating capacity K, gaseous component n1, dielectric constant e and refractive index k and liquid phase when mutually occurring occurred
Scene, the T values that the condensing temperature that can corroborate each other occurs, enhances the accuracy of verification.
The test problem of test device and method based on physical presence in production of the present invention, can be insulating gas engineering
A kind of measurement method and device of more science are provided using the gas-liquid two-phase transition problem that, experimental study is related to.
Experimental analysis：
Embodiment 1
With reference to figure 4, the temperature of insulating box is set by data monitoring processing unit using manual operation or program setting
It is 293K, final temperature 253K for initial temperature, per the constant 5min of 1K, sets constant volume bottle gas injection pressure as 2900kpa, gas injection
Mouth is MF1 mouthfuls of distribution unit, and pressure temperature curve is drawn in measurement pattern selection.
Before gas injection, booster air pump empties residual gas in constant volume bottle, until vacuum degree reaches setting value, injects 2900kpa
Certain gas starts insulating box, and per the constant 5min of 1K, recording manometer value records temperature value, draws two dimensional surface curve graph first
It is a, the constant 5min recording manometers values of 1K are reduced, temperature value is recorded, two dimensional surface second point of curve graph are drawn, in repetition
Process is stated, until 253K, is completed, provides two dimensional surface P-T curve graphs, the places i.e. 256K, as test be absolutely at knee of curve
The highest condensing temperature point of edge gas.
Embodiment 2
With reference to figure 5, the temperature of insulating box is set by data monitoring processing unit using manual operation or program setting
It is 293K, final temperature 443K, 293K to 383K for initial temperature, per 20k constant 5min, 383K to 423K, every 1K is constant
5min, 423K are to 443K, per the constant 5min of 20k, set constant volume bottle gas injection pressure as 100kpa, gas injection port is 3 distribution unit MF1
Mouthful, pressure temperature curve is drawn in measurement pattern selection.
Before gas injection, booster air pump empties residual gas in constant volume bottle, until vacuum degree reaches setting value, injects 100kpa
Certain gas starts insulating box, according to program recording manometer value, records temperature value, draws two dimensional surface first point of curve graph；
Temperature is increased according to program recording manometer value, temperature value is recorded, draws two dimensional surface second point of curve graph, repeat above-mentioned mistake
Journey is completed until 443K, provides two dimensional surface P-T curve graphs, and insulate gas for the places i.e. 413K at knee of curve, as test
The minimum condensing temperature point of body.
Claims (10)
1. a kind of insulating gas condensing temperature test device based on Schering bridge, which is characterized in that including：Insulating box (1) is determined
Hold bottle (2), electrode to (3), air distributing device (6), liquid-phase detection device and data monitoring processing unit；
The temperature range of insulating box (1) is adjustable, and constant volume bottle (2) is set in insulating box (1), and temperature is provided in constant volume bottle (2)
Table (4) and pressure gauge (5), thermometer (4) and pressure gauge (5) are respectively used to measure the temperature and pressure of constant volume bottle (2) interior gas；
(3) are arranged in the bottle wall of constant volume bottle (2) in electrode, and electrode is located in constant volume bottle (2) discharge end of (3), and electrode is to (3) position
In the both ends connection high voltage power supply forming circuit of constant volume bottle (2) outside, it is fixed that high voltage power supply can puncture (3) offer voltage for electrode
Hold the insulating gas to be measured in bottle (2)；The lower end of constant volume bottle (2) is provided with liquid-phase detection device, and liquid-phase detection device includes west
Woods electric bridge；The test side of Schering bridge is set in constant volume bottle (2), can be detected by Schering bridge to be measured in constant volume bottle (2)
The dielectric constant of insulating gas gas phase or liquid phase；Air distributing device (6) is connected with constant volume bottle (2), can by air distributing device (6)
It will be in the insulating gas to be measured injection constant volume bottle (2) of preparation；
Thermometer (4), pressure gauge (5), insulating box (1), air distributing device (6) and Schering bridge are supervised by signal wire and data respectively
Control processing unit is connected, and can complete information exchange with data monitoring processing unit.
2. a kind of insulating gas condensing temperature test device based on Schering bridge according to claim 1, feature exist
In the lower part of constant volume bottle (2) is provided with sample tap (7), can be to the insulation gas to be measured in constant volume bottle (2) by sample tap (7)
Body is sampled.
3. a kind of insulating gas condensing temperature test device based on Schering bridge according to claim 1, feature exist
In the temperature regulating range of insulating box (1) is 203.0K~423.0K.
4. a kind of insulating gas condensing temperature test device based on Schering bridge according to claim 1, feature exist
In high voltage power supply is high-voltage DC power supply or high-voltage ac power.
5. a kind of insulating gas condensing temperature test device based on Schering bridge according to claim 1, feature exist
In constant volume bottle (2) is made of metal material, and the madial wall of the cavity of the constant volume in constant volume bottle (2) is smooth surface, constant volume
The upper and lower end of bottle (2) is hemispherical.
6. a kind of insulating gas condensing temperature test device based on Schering bridge according to claim 5, feature exist
In liquid-phase detection device further includes optical fiber scene processing unit；Optical fiber scene processing unit is connected with constant volume bottle (2), can
Collect the liquid generated in constant volume bottle (2)；The letter of the signal output end and data monitoring processing unit of optical fiber scene processing unit
Number receiving terminal is connected.
7. a kind of insulating gas condensing temperature test device based on Schering bridge according to claim 1, feature exist
In air distributing device (6) includes air pump and mass flow controller；Air pump is connected by gas pipeline with the inside of constant volume bottle (2)
Logical, mass flow controller is arranged on the component gas conveyance conduit for forming insulating gas to be measured, component gas conveyance conduit
It is connected with the inside of constant volume bottle (2).
8. a kind of insulating gas condensing temperature test device based on Schering bridge according to claim 7, feature exist
In mass flow controller and component gas conveyance conduit are 3, and each mass flow controller setting is corresponding at one
On component conveyance conduit.
9. a kind of insulating gas condensing temperature test device based on Schering bridge according to claim 1, feature exist
In data monitoring processing unit includes data acquisition module, control module and touch display operation screen, data acquisition module, control
Molding block and touch display operation screen are connected with each other, and can carry out information exchange；Thermometer (4), pressure gauge (5) and optical fiber scene
The signal output end of processing unit is connected with the signal receiving end of the data acquisition module of data monitoring processing unit respectively, number
According to the signal output end signal receiving end with insulating box (1) and air distributing device (6) respectively of the control module of monitoring processing unit
It is connected.
10. a kind of insulating gas condensing temperature test method based on Schering bridge, which is characterized in that be based on claim 1 to 9
Any one of described in test device, including step in detail below：
Step 1, air distributing device (6) insulation to be measured that injection is prepared into constant volume bottle (2) is controlled by data monitoring processing unit
Gas；
Step 2, the temperature that insulating box (1) is controlled to adjust by data monitoring processing unit makes the insulation prepared in constant volume bottle (2)
The temperature of gas reaches preset value；
Step 3, the pressure of the insulating gas after being disposed by pressure gauge (5) acquisition step 2, and real-time pressure value is transmitted
It is recorded to data monitoring processing unit；
Step 4, the breakdown voltage and dielectric constant of the insulating gas after testing procedure 2 is disposed simultaneously record test data；
Step 5, step 2-4 is repeated, until being completed preset temperature range；Data will be obtained and carry out check analysis, obtained
Test the condensing temperature of insulating gas.
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| CN111381106A (en) * | 2018-12-28 | 2020-07-07 | 上海国缆检测中心有限公司 | Cable testing circuit, method, terminal and medium based on penicillin bridge |
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