CN104597340A - Low-temperature electrical characteristics testing device for air - Google Patents
Low-temperature electrical characteristics testing device for air Download PDFInfo
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- CN104597340A CN104597340A CN201410826487.9A CN201410826487A CN104597340A CN 104597340 A CN104597340 A CN 104597340A CN 201410826487 A CN201410826487 A CN 201410826487A CN 104597340 A CN104597340 A CN 104597340A
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Abstract
The invention belongs to the technical field of high voltage and insulation, and in particular relates to a low-temperature electrical characteristics testing device for air. The device mainly comprises a testing chamber, a vacuum pumping device, an air charging device, a cold source copper tube, a hot source copper wire, a temperature monitoring device and a heat insulation chamber which are connected according to the relation that the cold source copper tube and the heat source copper wire closely coil the testing chamber and integrally arranged in the heat insulation chamber; the testing chamber is connected with the vacuum pumping device and the air charging device; the heat source copper wire is connected with the temperature monitoring device; the vacuum pumping device is used for pumping vacuum for the testing chamber in order to prepare for charging the tested air into the testing chamber; the air charging device is used for charging the tested air into the testing chamber; the cold source copper tube is used for cooling the testing chamber; the heat source copper wire supplies heat to the testing chamber to enable adjustable temperature of the testing chamber; the temperature monitoring device controls the heat of the heat source copper wire so as to control and stable the temperature of the testing chamber; the heat insulation chamber comprises two vacuum chambers which can insulate the heat exchange between the testing chamber and the outside, and therefore, the cooling efficiency is increased. According to the device, a test platform is provided for testing the electrical characteristics in a common cold temperature area in which air is at the temperature from -153 to -30 DEG C.
Description
Technical field
The invention belongs to high voltage and insulation technology field, particularly a kind of gas low temperature electrical characteristic test device.
Background technology
SF
6gas is current optimal insulation and arc-extinguishing medium, widely uses in Electric Power Equipment Insulation.But SF
6be the heavy gas that molecular weight is larger, the more general common gases of condensing temperature is high, under, temperature comparatively large at pressure crosses low environment, easily liquefies, therefore SF
6gas is not suitable for extremely frigid zones.Solve extremely frigid zones SF
6this problem that gas exists, method adds N2 in SF6, and the common gases such as CO2 or air forms binary mixture.
On the other hand, SF6 is a kind of very strong greenhouse gases, and the alternative gas finding SF6 also becomes the focus of research both at home and abroad.In Refrigeration and Cryogenic Engineering, generally general cold warm area is defined in 120K to normal temperature (-153 DEG C ~ normal temperature).At present, under the condition of the research that gas substitutes to SF6 mainly more than-30 DEG C, the condensing temperature of the of good performance alternative gas (as c-C4F8, CF3I) found even is higher than SF6 gas, and also can have an impact to gas-insulated performance due to temperature factor itself, thus, achievement in research is inapplicable at the general cold warm area of-153 DEG C ~-30 DEG C.
At the extremely frigid zones of China, temperature is minimum reaches-30 DEG C ~-40 DEG C, can relate at-153 DEG C ~-30 DEG C in a big way in the temperature of the transition sections of equipment from normal temperature to liquid nitrogen temperature such as superconducting power device current feed, in order to solve the gas-insulated problem of these Code in Hazardous Special Locations, alternative gas and the insulating property of gaseous mixture under general cold warm area of research SF6 are very necessary.The present invention can low temperature in analog gas insulation application, High Voltage environment, for the test of gas electrical specification under the general cold warm area of-153 DEG C to-30 DEG C provides test platform.
Summary of the invention
In order to provide a temperature-controllable adjustable to the test of gas electrical specification under general cold warm area, electrode separation is quantitatively adjustable and proving installation that is ability High Voltage again, the invention provides a kind of gas low temperature electrical characteristic test device.
Described gas low temperature electrical specification device, mainly comprises test chamber, vacuum extractor, aerating device, low-temperature receiver copper pipe, thermal source copper wire, device for monitoring temperature and heat-insulation chamber.Annexation between its each several part is: low-temperature receiver copper pipe and thermal source copper wire, closely around test chamber, are placed in heat-insulation chamber in the lump, and test chamber is connected with vacuum extractor, aerating device respectively; Thermal source copper wire is connected with device for monitoring temperature.Vacuum extractor vacuumizes test chamber, prepares for test chamber is filled with tested gas; Aerating device is filled with tested gas to test chamber; Low-temperature receiver copper pipe cools test chamber; Thermal source copper wire provides heat for test chamber, makes test chamber temperature adjustable; The heat of device for monitoring temperature to thermal source copper wire controls, and then the temperature in control and steady testing chamber; Heat-insulation chamber can intercept test chamber and the external world carries out heat interchange, improves cooling effectiveness.
Described test chamber comprises test chamber, upper top cover, test electrode and watch window.Described test chamber is a diameter is 200mm, is highly 200mm, and chamber wall thickness is the stainless steel cylindrical drum of 3mm.The material of described upper top cover adopts teflon, and there are a handwheel in central authorities, for regulating the stroke of described high-field electrode, thus change the electrode separation of described test electrode, and then enable electrode separation quantitatively adjustable in a sealed meter environment.The Circularhole diameter of described watch window is 100mm, adopts that intensity is high, the sealing of tempered glass that security is good, can the discharge scenario of observation test intracavity gas.
The connector of described vacuum extractor and aerating device adopts the mouth that is threaded, and the valve of connector adopts ball valve, enables test chamber vacuum negative pressure resistant strong, the normal pressure of ability 0.1MPa to 0.8MPa again.Described vacuum extractor adopts mechanical pump, and the pressure container apparatus that described aerating device adopts tested gas to carry, makes easy to operation like this.
The material of described low-temperature receiver copper pipe and thermal source copper wire is the red copper with excellent thermal conductivity energy, tight around test chamber outer wall, uniform low-temperature receiver and thermal source can be provided for test chamber, reduce the convection current of the gas in test chamber, effectively improve validity and the accuracy of experiment.The internal diameter of described low-temperature receiver copper pipe is 10mm, and thickness of pipe is 1mm, when temperature adjustment or temperature control, passes into liquid nitrogen in low-temperature receiver copper pipe, and test chamber temperature is declined; The diameter of described thermal source copper wire is 3mm, copper wire is provided with the heating arrangement of power adjustable.
Described device for monitoring temperature comprises temperature collecting device and temperature control equipment.Described temperature collecting device comprises two PT100 temperature sensors, is separately positioned on high-field electrode bottom described test chamber He described, and wherein, the PT100 temperature sensor be arranged on high-field electrode does temperature calibration before testing, and takes off during test; Signal processing module, is electrically connected with described two PT100 temperature sensors, carries out filter and amplification to measured temperature voltage signal; Data collecting card, for gathering the temperature voltage signal with high-field electrode bottom described test chamber, described in its input termination, the output signal of signal processing module, exports to this temperature signal on LabView platform, carry out showing and processing, then feedback exports described temperature control equipment to.Described temperature control equipment is the adjustable device of a heating power, is arranged on described thermal source copper wire, for regulating the temperature of described test chamber.
Described heat-insulation chamber comprises two-layer vacuum chamber, can intercept test chamber and the external world carries out heat interchange, improves cooling effectiveness; Described vacuum chamber is built-in with multiple pillar, for supporting described test chamber.
Accompanying drawing explanation
Fig. 1 is the structural representation of described gas low temperature electrical characteristic test device.
Fig. 2 is the engineering schematic diagram of described gas low temperature electrical characteristic test device.
Fig. 3 is the process flow diagram of temperature adjusting mode.
Fig. 4 is the process flow diagram of gas low temperature electrical characteristics test.
Embodiment
The invention provides a kind of gas low temperature electrical characteristic test device, below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Figure 1 shows that the structural representation of described gas low temperature electrical specification device, mainly comprise test chamber, vacuum extractor, aerating device, low-temperature receiver copper pipe, thermal source copper wire, device for monitoring temperature and heat-insulation chamber.As shown in Figure 1, low-temperature receiver copper pipe and thermal source copper wire, closely around test chamber, are placed in heat-insulation chamber in the lump, and test chamber is connected with vacuum extractor, aerating device respectively; Thermal source copper wire is connected with device for monitoring temperature.The material of low-temperature receiver copper pipe and thermal source copper wire is the red copper with excellent thermal conductivity energy, tightly around test chamber outer wall, can provide uniform low-temperature receiver and thermal source for test chamber, reduces the convection current of the gas in test chamber, effectively improves validity and the accuracy of experiment.The internal diameter of described low-temperature receiver copper pipe is 10mm, and thickness of pipe is 1mm, when temperature adjustment or temperature control, passes into liquid nitrogen in low-temperature receiver copper pipe, and test chamber temperature is declined; The diameter of described thermal source copper wire is 3mm, copper wire is provided with the heating arrangement of power adjustable, when temperature adjustment or temperature control, regulates the power of heating arrangement, changes the heat that copper wire passes to, thus changes or temperature in steady testing chamber.Heat-insulation chamber comprises two-layer vacuum chamber, can intercept test chamber and the external world carries out heat interchange, improves cooling effectiveness; Vacuum chamber is built-in with multiple pillar, for supporting described test chamber.
Vacuum extractor adopts mechanical pump, and before inflation, require first to vacuumize described test chamber, vacuum level requirements is below 10Pa, and good mechanical pump final vacuum can reach 0.1Pa, can meet vacuum level requirements; The pressure container apparatus that aerating device adopts tested gas to carry, makes easy to operation like this.
Figure 2 shows that the engineering schematic diagram of described gas low temperature electrical characteristic test device.As shown in Figure 2, test chamber comprises test chamber, upper top cover, test electrode and watch window.Test chamber is an internal diameter is 200mm, is highly 200mm, and chamber wall thickness is the stainless steel cylindrical drum of 3mm.Sealing between upper top cover and test chamber main part adopts screw tightening and teflin ring to seal, the material of upper top cover adopts teflon, can seal and can heat-blocking action be played, there are a handwheel in its central authorities, for regulating the stroke of described high-field electrode, the stroke that handwheel revolves the high-field electrode that turns around changes 1mm, thus changes the electrode separation of test electrode, and then enables electrode separation quantitatively adjustable in a sealed meter environment.High-field electrode and low-field electrode all adopt and are threaded, and are convenient for changing test electrode shape, to change the distribution of test electric field.The circular hole internal diameter of watch window is 96mm, and extension elongation is 176mm, adopts that intensity is high, the sealing of tempered glass that security is good, can the discharge scenario of observation test intracavity gas.View window is connected to four-way piece, and four-way piece internal diameter is 16mm, and each connector of four-way piece is connected with vacuum extractor, aerating device, vacuum measuring device and device for pressure measurement respectively.Each connector of four-way piece all adopts the mouth that is threaded, and the valve of vacuum extractor and aerating device connector adopts ball valve, enables test chamber vacuum negative pressure resistant strong, the normal pressure of ability 0.1MPa to 0.8MPa again.Heat-insulation chamber is a vacuum chamber, can intercept test chamber and the external world carries out heat interchange, improves cooling effectiveness.
Figure 3 shows that the process flow diagram of temperature adjusting mode.As shown in Figure 3, temperature sensor is PT100 temperature sensor, temperature signal is converted into voltage signal, signal processing module carries out filter and amplification to measured voltage signal, voltage signal after process is sent to data collecting card, then carry out showing and processing on Labview platform, then feedback exports electric heater unit to.The position of PT100 temperature sensor measurement is respectively high-field electrode bottom described test chamber He described, and wherein, the PT100 temperature sensor be arranged on high-field electrode does temperature calibration before testing, and takes off when testing; The principle of described temperature calibration is as follows: temperature adjusting to as if test chamber in gas, as shown in Figure 2, calorie spread approach bottom test chamber is mainly by the heat transfer with low-temperature receiver copper pipe and thermal source copper wire, and with test intracavity gas convection current, and the calorie spread approach of high-field electrode is mainly through the convection current of test chamber indoor gas, when thermal equilibrium is stablized, if the temperature bottom test chamber is equal with the temperature of high-field electrode, then can think that the temperature of test intracavity gas also equals both temperature above.When carrying out temperature calibration, with the temperature curve of high-field electrode bottom record test chamber, and both records temperature curve starts the time of coincidence.Carry out temperature calibration different temperature provinces is repeated multiple times, get maximum temperature curve and start the time of coincidence, be designated as t.Before test, take off the temperature sensor on high-field electrode.When testing, the temperature curve bottom test chamber is in stable, after elapsed time t, just think the temperature of high-field electrode with test intracavity gas temperature all with test chamber bottom temperature equal.
Figure 4 shows that the process flow diagram of gas low temperature electrical characteristics test.First proving installation is vacuumized, be then filled with test gas, then described proving installation temperature is adjusted to desired value, regulate electrode separation, on high-field electrode, finally apply voltage test.After completing once test, as requested, mode of operation is selected.To seek common ground, gas Different electrodes spacing is at the same temperature tested, and only need regulate electrode separation; To seek common ground, a gas is tested at different temperatures, then need operation from adjustment temperature; If desired change gas or change Different electrodes, again will operate from proving installation vacuumizes.
Claims (5)
1. a gas low temperature electrical characteristic test device, is characterized in that: mainly comprise test chamber, vacuum extractor, aerating device, low-temperature receiver copper pipe, thermal source copper wire, device for monitoring temperature and heat-insulation chamber; Annexation between its each several part is: low-temperature receiver copper pipe and thermal source copper wire, closely around test chamber, are placed in heat-insulation chamber in the lump, and test chamber is connected with vacuum extractor, aerating device respectively; Thermal source copper wire is connected with device for monitoring temperature; Vacuum extractor vacuumizes test chamber, prepares for test chamber is filled with tested gas; Aerating device is filled with tested gas to test chamber; Low-temperature receiver copper pipe cools test chamber; Thermal source copper wire provides heat for test chamber, makes test chamber temperature adjustable; The heat of device for monitoring temperature to thermal source copper wire controls, and then the temperature in control and steady testing chamber; Heat-insulation chamber comprises two-layer vacuum chamber, can intercept test chamber and the external world carries out heat interchange, improves cooling effectiveness.
2. a kind of gas low temperature electrical characteristic test device according to claim 1, it is characterized in that: described test chamber comprises test electrode, described test electrode comprises again high-field electrode and low-field electrode, quantitatively can regulate electrode separation in a sealed meter environment.
3. a kind of gas low temperature electrical characteristic test device according to claim 1, it is characterized in that: the connector of described vacuum extractor and aerating device adopts the mouth that is threaded, the valve of connector adopts ball valve, enable test chamber vacuum negative pressure resistant strong, the normal pressure of ability 0.1MPa to 0.8MPa again.
4. a kind of gas low temperature electrical characteristic test device according to claim 1, it is characterized in that: described low-temperature receiver copper pipe and thermal source copper wire are tightly around test chamber outer wall, uniform low-temperature receiver and thermal source can be provided for test chamber, reduce the convection current of the gas in test chamber, effectively improve validity and the accuracy of experiment.
5. a kind of gas low temperature electrical characteristic test device according to claim 1, is characterized in that: described device for monitoring temperature comprises temperature collecting device and temperature control equipment; Described temperature collecting device comprises two PT100 temperature sensors, be separately positioned on bottom described test chamber with on high-field electrode according to claim 2, wherein, the PT100 temperature sensor be arranged on high-field electrode does temperature calibration before testing, and takes off during test; Signal processing module, is electrically connected with described two PT100 temperature sensors, carries out filter and amplification to measured temperature voltage signal; Data collecting card, for gathering the temperature voltage signal with described high-field electrode bottom described test chamber; Described temperature control equipment, is arranged on described thermal source copper wire, for regulating the temperature of described test chamber.
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| CN201410826487.9A CN104597340B (en) | 2014-12-26 | 2014-12-26 | Low-temperature electrical characteristics testing device for air |
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| CN104597340B CN104597340B (en) | 2017-05-17 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105891648A (en) * | 2016-06-17 | 2016-08-24 | 华北电力大学 | Measuring equipment for SST (Steady State Townsend) |
| CN106872082A (en) * | 2017-04-28 | 2017-06-20 | 中国地震局地壳应力研究所 | A kind of body strain dynamic characteristic measuring instrument and measuring method |
| CN107960832A (en) * | 2016-10-19 | 2018-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Cooking equipment and its control method and control device |
| CN109683075A (en) * | 2019-03-05 | 2019-04-26 | 云南电力技术有限责任公司 | A kind of insulating materials local discharge test device |
| CN110763968A (en) * | 2019-12-06 | 2020-02-07 | 哈尔滨理工大学 | Full-angle visual gas breakdown testing system |
| 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 |
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| CN107960832A (en) * | 2016-10-19 | 2018-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Cooking equipment and its control method and control device |
| CN106872082A (en) * | 2017-04-28 | 2017-06-20 | 中国地震局地壳应力研究所 | A kind of body strain dynamic characteristic measuring instrument and measuring method |
| CN109683075A (en) * | 2019-03-05 | 2019-04-26 | 云南电力技术有限责任公司 | A kind of insulating materials local discharge test device |
| CN110763968A (en) * | 2019-12-06 | 2020-02-07 | 哈尔滨理工大学 | Full-angle visual gas breakdown testing system |
| 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 |
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| CN104597340B (en) | 2017-05-17 |
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