CN102426324A - Tester for testing insulation low-temperature performance of superconducting electrical component - Google Patents
Tester for testing insulation low-temperature performance of superconducting electrical component Download PDFInfo
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- CN102426324A CN102426324A CN2011102431041A CN201110243104A CN102426324A CN 102426324 A CN102426324 A CN 102426324A CN 2011102431041 A CN2011102431041 A CN 2011102431041A CN 201110243104 A CN201110243104 A CN 201110243104A CN 102426324 A CN102426324 A CN 102426324A
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Abstract
The invention discloses a tester for testing the insulation low-temperature performance of a superconducting electrical component. The tester comprises a vacuum pressure container, a testing container seal flange is arranged at the top of the vacuum pressure container, a low-temperature superconducting testing component is arranged in the vacuum pressure container, a temperature sensor is fixed on the side wall of a low-temperature superconducting testing component and is connected with a temperature and leakage current data acquisition system, the upper end of the low-temperature superconducting testing component extends out of the testing container seal flange and is connected with a high potential line, and an insulating surface of the lower end of the low-temperature superconducting testing component and the side wall of the vacuum pressure container are connected with low potential lines. Through the tester disclosed by the invention, the outside insulation low-temperature DC (Direct Current) resisting high-voltage performance of the superconducting electric component can be detected under Paschen conditions, the testing range of temperature is 4.5-300K, the testing range of air pressure is 103-105Pa, the control precision of the temperature and the air pressure are high, and high voltage and low voltage are convenient to be fed in or out; simultaneously, the purposes of continuously testing the insulation performance under various conditions such as normal pressure and temperature, low temperature and air pressure, thermal circulation and the like can be effectively realized.
Description
Technical field
The present invention relates to a kind of design field that is used for superconductive current lead low-temperature insulation service check proving installation, for the insulation scheme of all kinds of low temperature electric components such as superconduction feeder line provides practical quality verification means.
Background technology
What Paschen's law was described is the nonlinear function between gas breakdown voltage and two electrode separations and the air pressure.The Paschen electric discharge phenomena are a kind of gas discharge character, with the physical characteristics of gas self confidential relation are arranged, and the variation when position between sparking electrode simultaneously also has direct influence to discharge characteristics.After electrode position was fixing, gas atmosphere reached in a certain particular range, only needed utmost point low-voltage that electric discharge phenomena will take place.Under the room temperature environment, helium is at 150V, and the Paschen discharge will take place 3.3Pa-m (air pressure and electrode distance product).
All tokamak superconducting magnets with and the superconduction feeder system must be under low temperature and vacuum environment could normal operation.Noble potential parts voltage-to-ground in the operating mode lower magnet is merely tens to the hectovolt magnitude, but in case occur that plasma breaks or situation such as magnet quenching, several million burnt energy need release in short-term, and the voltage-to-ground of total system will rise to ten thousand volts of magnitudes rapidly.In order to prevent between noble potential parts and the zero potential parts that the Paschen discharge takes place, magnet, superconduction feeder line, cooling and the measurement line etc. that are in noble potential all must be used solid insulating layer to carry out high electronegative potential to completely cut off, cut off discharge path so in theory.But because the electromagnetic force load and the thermal stress of magnet system operation; Physical damnifications such as superconduction electric component insulation course all may produce cracking after long-time low temperature environment operation and cold cycling, wear out; And also possibly there are some inherent shortcomings in insulation course manufacturing process itself, and the accumulation of these unfavorable factors all can provide necessary discharge path for the Paschen discharge.If when insulation defect produces, occur to a certain degree vacuum leak or the leakage of pipeline helium simultaneously again, just be easy to take place the Paschen discharge accident this moment.
Therefore the electric parts insulate of all superconductions can strict control of quality, adopts certain measure simulation Paschen discharge environment to carry out the withstand voltage properties test, and use on parts qualified back.The proving installation that is used to detect low-temperature superconducting electric component insulating property must strict simulation real running environment of electric component insulation course and bad working environments, so low temperature, high vacuum seal and leakage current and temperature data collecting system become the necessary condition of check low-temperature superconducting electric component insulating property device.
Summary of the invention
For the anti-dc high voltage performance of superconduction electricity piece exterior insulation low temperature under the check Paschen condition, the invention provides a kind of proving installation that is used to check superconduction electric component isolated cryogenic performance, the temperature test scope is 4.5K ~ 300K, the air pressure test specification is 10
-3~ 10
5Pa, the temperature and air pressure control accuracy is high, and high low-voltage feeds out into convenient, has effectively realized the purpose of insulating property continuity check under the multiple conditions such as normal temperature and pressure, low-temperature and low-pressure and cold cycling simultaneously.
The technical scheme that the present invention adopts is following:
A kind of proving installation that is used to check superconduction electric component isolated cryogenic performance; Include the vacuum pressure container, the top of vacuum pressure container is equipped with the test container seal flange, is provided with the low-temperature superconducting test component in the vacuum pressure container; The vacuum pressure container intracavity is communicated with vacuum air pump; Have cryogenic gas on the low-temperature superconducting test component and import and export, cryogenic gas is imported and exported and is connected with the cryogenic gas reservoir, is fixed with temperature inductor on the low-temperature superconducting test component sidewall; Temperature inductor is connected with temperature, leakage data acquisition system; Low-temperature superconducting test component upper end is stretched out the test container seal flange and is connected with the noble potential line, and the other end of noble potential line is connected with high pressure generator, and the sidewall of low-temperature superconducting test component lower end insulating surface and vacuum pressure container is connected with the electronegative potential line.
Described test container seal flange includes the test component Insulation test flanged plate, test component insulation joint flange, the test component insulation that cooperate with the vacuum pressure container and is connected neck tube.
Said cryogenic gas reservoir is liquid nitrogen or liquid helium reservoir.
Vacuum pressure container of the present invention: test vacuum pressure container adopts the 316L stainless steel to guarantee the low temperature reliability, is designed to cylindricly, and its size can be according to the dimensionally-optimised design of the electric component of handling through insulation (or sample) that detects.Columned configuration design can effectively guarantee the homogeneity of internal tank air pressure and temperature.Test container seal flange of the present invention: vacuum tank top test container seal flange material also adopts 316L; Flange design keeps a plurality of sealed interfaces, and the route of pipe line that is used for cooling system, pumped vacuum systems, temperature system and leakage data acquisition system connects.Fitting tight circle between flange and the vacuum pressure container adopts the sealing of bolt axial pretightening simultaneously.Flange plays the effect of support and fixing test parts simultaneously.Cooling system of the present invention: because the low-temperature superconducting electricity piece adopts the cryogenic liquid cooling circuit to cool off when operation; Therefore this proving installation is simulated real working condition; The test component inside of flowing through, the gateway that outside liquid nitrogen (liquid helium) is reserved through test component; Thereby test component is cooled off, be mainly and avoid liquid nitrogen (liquid helium) to get into vacuum tank change humidity, and then influence the degree of accuracy of test component tracking current data acquisition.Cooling system can accurately provide the probe temperature of 4.5K ~ 300K scope.Pumped vacuum systems of the present invention: the vacuum pressure container pressure can vacuumize through molecular pump and reach 10
-3Pa regulates air pressure through pressure valve then, and the air pressure adjustment scope is 10
-3~ 10
5Pa.Temperature online acquisition system of the present invention: be employed in the mode monitor temperature that temperature inductor is pasted on the test component surface; To the low-temperature superconducting current feed; Adopt preset 6 PT1000 RTD temperature inductor on-line monitoring temperature, can choose the temperature inductor of relevant temperature area requirement for the electric test parts under other condition of different temperatures as requested.Through the C++ programming, through the corresponding temperature value of variation Function Mapping of temperature inductor resistance value.Leakage data acquisition system of the present invention: the inside surface of low-temperature superconducting test component 316L material connects noble potential; Test component insulated outer surface parcel aluminium foil connects electronegative potential, under different atmospheric pressure values, through the external high pressure generator foregoing circuit is applied certain voltage; If insulation course has defectives or damaged through occurring after the cold cycling such as crackle; Then the Paschen discharging condition is prone to satisfy, and then insulation course can take place punctures abominable situation, and this moment, leakage current can surpass 3000 μ A rapidly.Therefore, can effectively check the performance of low-temperature superconducting parts insulation through the leakage current acquisition system.
The present invention can check the anti-dc high voltage performance of superconduction electricity piece exterior insulation low temperature under the Paschen condition, and the temperature test scope is 4.5K ~ 300K, and the air pressure test specification is 10
-3~ 10
5Pa, the temperature and air pressure control accuracy is high, and high low-voltage feeds out into convenient, has effectively realized the purpose of insulating property continuity check under the multiple conditions such as normal temperature and pressure, low-temperature and low-pressure and cold cycling simultaneously.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is that test component insulation joint flange of the present invention connects synoptic diagram.
Fig. 3 is the structural representation of test container seal flange of the present invention.
Wherein, label among the figure: 1-test container seal flange, 2-vacuum pressure container; 3-low-temperature superconducting test component, 4-vacuum air pump, 5-high pressure generator; The 6-cryogenic gas is imported and exported, 7-cryogenic gas reservoir, 8-temperature, leakage data acquisition system; 9-test component insulation joint flange, the insulation of 10-test component connects neck tube, 11-test component Insulation test flanged plate
Embodiment
Referring to accompanying drawing; A kind of proving installation that is used to check superconduction electric component isolated cryogenic performance; Include vacuum pressure container 2; The top of vacuum pressure container 2 is equipped with test container seal flange 1, and test container seal flange 1 includes the test component Insulation test flanged plate 11, test component insulation joint flange 9, the test component insulation that cooperate with the vacuum pressure container and is connected neck tube 10; Be provided with low-temperature superconducting test component 3 in the vacuum pressure container; The vacuum pressure container intracavity is communicated with vacuum air pump 4; Have cryogenic gas on the low-temperature superconducting test component and import and export 6; Cryogenic gas is imported and exported 6 and is connected with cryogenic gas reservoir 7, and cryogenic gas reservoir 7 is liquid nitrogen or liquid helium reservoir, is fixed with temperature inductor on the low-temperature superconducting test component sidewall; Temperature inductor is connected with temperature, leakage data acquisition system; Low-temperature superconducting test component upper end is stretched out the test container seal flange and is connected with the noble potential line, and the other end of noble potential line is connected with high pressure generator, and the sidewall of low-temperature superconducting test component lower end insulating surface and vacuum pressure container is connected with the electronegative potential line.
The present invention introduces as noble potential extending to test container seal flange 1 outside outside the test component one end lengthening when test, wraps up aluminium foil and connects the vacuum tank wall at the inner test component insulating surface of vacuum tank, draws as electronegative potential ground connection.Temperature inductor T1, T2, T3 are fixed on the test component, and refrigerating gas is (like figure liquid nitrogen LN
2) built-in with the proving installation respectively low temperature import and export 6 sealing assembling dresses of turnover pipeline, last and vacuum pressure container 2 integral sealings assemble, and have so just formed the Insulation test body construction.At internal tank, electricity piece parts insulation course to be measured all is in the Paschen discharge environment.
The flange connecting assembly structural representation on Insulation test seal of vessel flange 1 top is as shown in Figure 2; One end of electric insulating part to be measured is connected neck tube 10 through test component insulation joint flange 9 with the test component insulation and is fixed on the test component Insulation test flanged plate 11; Preprocessing moulding refrigerating gas, vacuum pumping port and measurement socket on test component Insulation test flanged plate 11; Test component insulation joint flange 9, test component insulation connect neck tube 10 can be made detecting electric insulating element and test container seal flange 1 be tightly connected with test component Insulation test flanged plate 11 to be in the same place the assurance sealing effectiveness.
Claims (3)
1. proving installation that is used to check superconduction electric component isolated cryogenic performance; Include the vacuum pressure container, the top of vacuum pressure container is equipped with the test container seal flange, is provided with the low-temperature superconducting test component in the vacuum pressure container; The vacuum pressure container intracavity is communicated with vacuum air pump; It is characterized in that: have cryogenic gas on the low-temperature superconducting test component and import and export, cryogenic gas is imported and exported and is connected with the cryogenic gas reservoir, is fixed with temperature inductor on the low-temperature superconducting test component sidewall; Temperature inductor is connected with temperature, leakage data acquisition system; Low-temperature superconducting test component upper end is stretched out the test container seal flange and is connected with the noble potential line, and the other end of noble potential line is connected with high pressure generator, and the sidewall of low-temperature superconducting test component lower end insulating surface and vacuum pressure container is connected with the electronegative potential line.
2. the proving installation that is used to check superconduction electric component isolated cryogenic performance according to claim 1 is characterized in that: described test container seal flange includes the test component Insulation test flanged plate, test component insulation joint flange, the test component insulation that cooperate with the vacuum pressure container and is connected neck tube.
3. the proving installation that is used to check superconduction electric component isolated cryogenic performance according to claim 1 is characterized in that: said cryogenic gas reservoir is liquid nitrogen or liquid helium reservoir.
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|---|---|---|---|
| CN2011102431041A CN102426324A (en) | 2011-08-24 | 2011-08-24 | Tester for testing insulation low-temperature performance of superconducting electrical component |
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|---|---|---|---|
| CN2011102431041A CN102426324A (en) | 2011-08-24 | 2011-08-24 | Tester for testing insulation low-temperature performance of superconducting electrical component |
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| CN102707204A (en) * | 2012-05-24 | 2012-10-03 | 中国科学院等离子体物理研究所 | Testing experimental platform for performing disruptive discharge on insulation sample under low-temperature vacuum environment |
| CN102866298A (en) * | 2012-09-04 | 2013-01-09 | 中国科学院等离子体物理研究所 | Multichannel temperature gradient method RRR testing sample rod |
| CN102928718A (en) * | 2012-11-06 | 2013-02-13 | 华北电力大学 | Superconductivity insulation material electrical characteristic test device |
| CN103537773A (en) * | 2013-10-12 | 2014-01-29 | 合肥聚能电物理高技术开发有限公司 | Vacuum soldering device for superconducting cables |
| CN103713220A (en) * | 2013-12-31 | 2014-04-09 | 深圳供电局有限公司 | Low-temperature container capable of achieving temperature changing and pressure changing |
| CN104597340A (en) * | 2014-12-26 | 2015-05-06 | 华北电力大学 | Low-temperature electrical characteristics testing device for air |
| CN104635125A (en) * | 2015-01-22 | 2015-05-20 | 国家电网公司 | Superconduction current lead voltage withstanding test system |
| CN107045098A (en) * | 2017-05-29 | 2017-08-15 | 西南交通大学 | The operating mode that colds and heat succeed each other is got off download cable terminal industrial frequency withstand voltage pilot system and method |
| CN107817841A (en) * | 2017-09-30 | 2018-03-20 | 中国科学院合肥物质科学研究院 | A kind of accurate temperature control system for facing liquid helium temperature |
| CN108169283A (en) * | 2017-12-13 | 2018-06-15 | 北京交通大学 | The low temperature high-voltage test stage apparatus of superconduction sample |
| CN109655725A (en) * | 2019-01-04 | 2019-04-19 | 合肥聚能电物理高技术开发有限公司 | The quickly device and method of detection solid insulating layer Paschen performance at low pressure |
| CN111352011A (en) * | 2020-05-21 | 2020-06-30 | 湖南省湘电试研技术有限公司 | Tolerance characteristic test method, test circuit and design method of lightning protection insulator |
| CN111948499A (en) * | 2020-07-17 | 2020-11-17 | 中国科学院合肥物质科学研究院 | Testing device for local Paschen test of superconducting magnet |
| CN111982735A (en) * | 2020-08-21 | 2020-11-24 | 广东电网有限责任公司电力科学研究院 | Testing method and device for cross-temperature-zone high-voltage dry-type sleeve and terminal equipment |
| CN112327110A (en) * | 2020-10-19 | 2021-02-05 | 中国科学院电工研究所 | Wide-temperature-area liquid medium environment test device based on refrigerator conduction cooling |
| CN113075516A (en) * | 2021-05-08 | 2021-07-06 | 合肥聚能电物理高技术开发有限公司 | Low-temperature voltage withstand test method for radial insulator |
| CN114062876A (en) * | 2021-11-19 | 2022-02-18 | 中国科学院合肥物质科学研究院 | Test device and test method capable of directly observing Paschen discharge phenomenon of insulating substance |
| CN114062986A (en) * | 2021-11-17 | 2022-02-18 | 中国科学院合肥物质科学研究院 | Low-temperature superconducting insulation local Paschen test device capable of being observed in real time |
| CN116027112A (en) * | 2023-03-30 | 2023-04-28 | 中国科学院合肥物质科学研究院 | Superconducting joint back field-free testing device and testing method thereof |
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| CN102707204A (en) * | 2012-05-24 | 2012-10-03 | 中国科学院等离子体物理研究所 | Testing experimental platform for performing disruptive discharge on insulation sample under low-temperature vacuum environment |
| CN102866298A (en) * | 2012-09-04 | 2013-01-09 | 中国科学院等离子体物理研究所 | Multichannel temperature gradient method RRR testing sample rod |
| CN102866298B (en) * | 2012-09-04 | 2014-11-26 | 中国科学院等离子体物理研究所 | Multichannel temperature gradient method RRR testing sample rod |
| CN102928718A (en) * | 2012-11-06 | 2013-02-13 | 华北电力大学 | Superconductivity insulation material electrical characteristic test device |
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| CN104597340B (en) * | 2014-12-26 | 2017-05-17 | 华北电力大学 | Low-temperature electrical characteristics testing device for air |
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Application publication date: 20120425 |