CN102496679A - Liquid nitrogen low-temperature system for superconducting current limiter - Google Patents
Liquid nitrogen low-temperature system for superconducting current limiter Download PDFInfo
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- CN102496679A CN102496679A CN2011103439820A CN201110343982A CN102496679A CN 102496679 A CN102496679 A CN 102496679A CN 2011103439820 A CN2011103439820 A CN 2011103439820A CN 201110343982 A CN201110343982 A CN 201110343982A CN 102496679 A CN102496679 A CN 102496679A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 74
- 239000007788 liquid Substances 0.000 title claims abstract description 73
- 238000012360 testing method Methods 0.000 claims abstract description 56
- 238000009413 insulation Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 239000011229 interlayer Substances 0.000 claims description 16
- 239000003463 adsorbent Substances 0.000 claims description 7
- 239000010410 layer Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000002808 molecular sieve Substances 0.000 claims description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 2
- 238000005057 refrigeration Methods 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000010791 quenching Methods 0.000 description 15
- 238000011160 research Methods 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 239000002887 superconductor Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
A liquid nitrogen low-temperature system for a superconducting current limiter belongs to the field of low-temperature engineering and technique. The liquid nitrogen low-temperature system comprises a liquid nitrogen container, a liquid nitrogen valve, a liquid nitrogen refuel valve, a safety valve, a valve cap, a test Dewar, a thermal insulation layer, a rupture disk, a deflation valve, a flow meter, a vacuum measurement gauge, a pressure difference sensor, a pressure sensor, a support part, a pumping valve, a vacuum pump, a superconducting current limiter, a control circuit, a temperature sensor and a discharging air pipe. In the invention, the system adopts the liquid nitrogen as the cooling working medium; the superconducting current limiter for the test is placed in the test Dewar; switching between the superconducting state and superconducting loss state of the superconducting current limiter can be realized through the control circuit; and the pressure, pressure difference and temperature measured by the pressure sensor, the pressure difference sensor and the temperature sensor, and the quality flow of the gasified nitrogen in the superconducting loss state measured by the flow meter are inputted into a computer, so as to evaluate the refrigeration wastage of the low-temperature system of the superconducting current limiter, and study the influence of the bubbles exerted on the low-temperature system pressure intensity when superconducting current limiter is abnormal. The low-temperature system has the advantages of simple structure, good economical efficiency, and favorable safety.
Description
Technical field
The present invention relates to a kind of superconductive current limiter liquid nitrogen cryogenics system, produce the superconductive current limiter liquid nitrogen cryogenics system of bubble when particularly a kind of refrigeration loss that is used to assess the superconductive current limiter cryogenic system and research superconductive current limiter quench the influence of cryogenic system pressure.Belong to cryogenic engineering and cryogenic technique field.
Background technology
In electrical network, adding superconductive current limiter is a kind of new technology that limits the grid short circuit electric current.The basic functional principle of superconductive current limiter is to utilize the superconducting state of superconductor and the transformation of normal state (S/N);, electrical network shows as superconducting state when normally moving; When the electrical network failed because; The flow restricter that is serially connected in the electrical network is converted to normal state by superconducting state, is limited in transmission or the distribution system because the purpose of the excessive short circuit current that short trouble causes to reach.Superconductive current limiter is to study the most active a kind of superconducting power device.
Cryogenic system is that the application of superconductive current limiter provides the most basic service conditions.Superconductive current limiter comprises high-temperature superconductor that operates in liquid nitrogen temperature 77K and the low-temperature superconducting that operates in liquid helium warm area 4.2K.Compare with low-temperature superconducting, the magnetic heat stability of high-temperature superconductor is greatly improved, and has also reduced cost simultaneously widely.The operating cost of high-temperature superconductor is much lower more than low-temperature superconducting, and the cooled with liquid nitrogen expense is merely about 1/50 of liquid helium refrigeration costs, in practical application, adopts the high-temperature region superconductive current limiter mostly.
Usually, be applicable to that the cryogenic system of superconductive current limiter adopts closed system: adopt immersing in liquid nitrogen, and use refrigeration machine that cold is provided, the nitrogen of liquefaction evaporation in time, thereby required low temperature environment when keeping superconductive current limiter work.Though this closed system has been saved the use amount of liquid nitrogen to a great extent, owing to will add refrigeration machine, cost is higher, if only be used for the performance test of superconductive current limiter, and discontented sufficient economy requirement.In the prior art; Appoint that people such as beautiful, Tang Yuejin adopts in " the method for testing performance research of superconductive current limiter " (" low temperature and superconduction " the 36th volume first phase) literary composition be superconductive current limiter cryogenic system and the Li Jianji of refrigeration machine and cooled with liquid nitrogen in " superconductive current limiter " (" 2002 the 7th phases of electrotechnics journal) literary composition in order to guarantee minimum liquid nitrogen; Nitrogen to evaporation adopts the cooling cycle system of sealing to collect, and in refrigeration machine, liquefies.The cryogenic system that above-mentioned two research institutes adopt is the closed system that has refrigeration machine.
Summary of the invention
In order to overcome the deficiency of prior art, the present invention proposes a kind of liquid nitrogen cryogenics system that is used for superconductive current limiter.This cryogenic system directly adopts immersing in liquid nitrogen, does not add refrigeration machine, keeps the required low temperature environment of superconductive current limiter work through the immersion and the evaporation of liquid nitrogen, and the nitrogen that evaporates because of the absorption heat directly enters atmosphere or enters atmosphere through after the reprocessing.
As cooling working medium, the superconductive current limiter that is used for testing is positioned over the test Dewar to this cryogenic system with liquid nitrogen.Realize the switching of superconductive current limiter superconducting state and quench attitude through control circuit.The nitrogen mass flow that gasifies during superconduction quench that the pressure that pressure sensor, differential pressure pickup, temperature sensor record, pressure reduction, temperature and flowmeter record; All import computer, producing bubble when being used to assess the refrigeration loss of superconductive current limiter cryogenic system and studying the superconductive current limiter quench influences cryogenic system pressure.This experimental rig is simple in structure, is easy to make, and has good and economic and fail safe.
The present invention realizes through following technical proposals.
The present invention includes that liquid nitrogen container, liquid nitrogen valve, liquid nitrogen fill valve, safety valve, valve gap, test Dewar, heat-insulation layer, rupture disk, evacuation valve, vacuum pump, vent valve, flowmeter, vacuum measurement are regulated, differential pressure pickup, pressure sensor, adsorbent, strutting piece, superconductive current limiter, control circuit, temperature sensor and bleeder pipe.Wherein test Dewar and be connected through flange, be convenient to the replacing of superconductive current limiter with valve gap; Superconductive current limiter is immersed in the test Dewar by supports support, and the upper end of strutting piece links to each other with valve gap; The control circuit that is in room temperature is electrically connected with superconductive current limiter, is used to realize the switching of superconductive current limiter superconducting state and quench attitude; Heat-insulation layer is installed in the valve gap below, is used to prevent long-pending dew of valve gap and long-pending frost; Safety valve, rupture disk are installed on the valve gap, produce the unsafe factor that hyperbar causes when preventing because of the superconductive current limiter quench.
Vent valve one end is communicated with the test Dewar through bleeder pipe, and the other end is through flowmeter and atmosphere, and flowmeter is used to measure the nitrogen flow of evaporation; The output of liquid nitrogen container is communicated with the test Dewar through liquid nitrogen valve, liquid nitrogen fill valve successively; Differential pressure pickup is used for experiment with measuring Dewar liquid height, and pressure sensor is used for the liquid nitrogen pressure of experiment with measuring Dewar; Temperature sensor is used to measure the temperature of superconductive current limiter each point; Vacuum measurement is regulated on the outer wall that is installed in the test Dewar, is used for the vacuum degree of experiment with measuring Dewar vacuum interlayer; Vacuum pump is communicated with through the vacuum interlayer of evacuation valve with the test Dewar, is used for the vacuum interlayer of test Dewar is vacuumized; Adsorbent is placed on the bottom of the vacuum interlayer of test Dewar, is used to keep the high vacuum of long period.
Before on-test, superconductive current limiter to be measured is installed in the test Dewar through strutting piece.Open evacuation valve, vacuumize, after the vacuum degree of the vacuum interlayer of testing Dewar reaches the vacuum requirement, close evacuation valve and vacuum pump successively, accomplish vacuumizing test Dewar vacuum interlayer by the vacuum interlayer of vacuum pump to the test Dewar.Open liquid nitrogen valve, liquid nitrogen fill valve; Fill liquid nitrogen to the test Dewar, reach certain value, promptly test in the Dewar liquid nitrogen liquid level and reach and be enough to guarantee that superconductive current limiter is fully immersed in the liquid nitrogen until pressure difference shown in the differential pressure pickup; Close the liquid nitrogen fill valve, stop to fill of liquid nitrogen.
In the process of the test, at first the refrigeration loss of the superconductive current limiter cryogenic system under superconducting state is assessed.Switch control through to control circuit makes control circuit be in normal operating conditions, and promptly superconductive current limiter is in superconducting state.Adjusting liquid nitrogen fill valve, vent valve to system are in stability, and this moment shows as differential pressure pickup and pressure sensor readings is constant basically, gathers the data that this moment, flowmeter recorded.Through theory analysis, calculating, can effectively be evaluated at the refrigeration loss of superconductive current limiter cryogenic system under the superconducting state.
Then, the switch control through to control circuit makes control circuit be in the short trouble state, at this moment the superconductive current limiter quench.Gather the data that pressure sensor at this moment records.Through theory analysis, the bubble that the research superconductive current limiter is produced when quench is to the influence of refrigerating system pressure.When liquid nitrogen gasifies rapidly, when test Dewar internal pressure sharply increased, safety valve was opened with pressure release automatically, and rupture disk explosion in case of necessity is to guarantee safety.
After the test of a specification superconductive current limiter is accomplished, close all appts and equipment.Through breaking off being connected of control circuit and superconductive current limiter, unload bottom flange, with regard to the superconductive current limiter of replaceable different size.Control circuit with after new superconductive current limiter is connected, is accomplished the replacing of superconductive current limiter.Other conditions are constant, repeat the test procedure of superconductive current limiter before this, and the bubble that is produced when assessment and superconduction quench that the superconductive current limiter of changing is carried out the loss of cryogenic system refrigeration is to the research of refrigerating system pressure influence.
Beneficial effect of the present invention: the present invention as cooling working medium, provides superconductive current limiter required low temperature environment through liquid nitrogen with liquid nitrogen, and the evaporation through liquid nitrogen when the superconduction quench absorbs the heat that superconductive current limiter produced.This cryogenic system directly adopts immersing in liquid nitrogen, does not add refrigeration machine, has reduced the cost of superconductive current limiter performance test, has satisfied the economy requirement.The test Dewar adopts flange to be connected with valve gap, is convenient to change the superconductive current limiter of different size, applicability and workable.This apparatus structure is simple, is easy to make, and has good and economic and fail safe.
Description of drawings
Fig. 1 is a superconductive current limiter liquid nitrogen cryogenics system configuration sketch map of the present invention.
1 liquid nitrogen container among the figure, 2 valve gaps, 3 test Dewars, 4 heat-insulation layers, 5 rupture disks, 6 vacuum pumps, 7 flowmeters, 8 vacuum measurements are regulated, 9 differential pressure pickups, 10 pressure sensors, 11 adsorbents, 12 strutting pieces, 13 superconductive current limiters, 14 control circuits, 15 temperature sensors, 16 bleeder pipes, V1 liquid nitrogen valve, V2 liquid nitrogen fill valve, V3 safety valve, V4 vent valve, V5 evacuation valve.
Embodiment
Below in conjunction with accompanying drawing practical implementation of the present invention is done further to describe.
As shown in Figure 1, the present invention includes that liquid nitrogen container 1, valve gap 2, test Dewar 3, heat-insulation layer 4, rupture disk 5, vacuum pump 6, flowmeter 7, vacuum measurement regulate 8, differential pressure pickup 9, pressure sensor 10, adsorbent 11, strutting piece 12, superconductive current limiter 13, control circuit 14, temperature sensor 15, bleeder pipe 16, liquid nitrogen valve V1, liquid nitrogen fill valve V2, safety valve V3, vent valve V4 and evacuation valve V5.
Wherein, test Dewar 3 and valve gap 2 are connected through flange, are convenient to the replacing of superconductive current limiter 13; Superconductive current limiter 13 is supported by superconductive current limiter strutting piece 12 and is immersed in the test Dewar 3, and the upper end of strutting piece 12 links to each other with valve gap 2; The control circuit 14 that is in room temperature is electrically connected with superconductive current limiter 13, is used to realize the switching of superconductive current limiter 13 superconducting states and quench attitude; Heat-insulation layer 4 is installed in valve gap 2 belows, is used to prevent valve gap 2 long-pending dew and long-pending frost; Safety valve V3, rupture disk 5 are installed on the valve gap 2, produce the unsafe factor that hyperbar causes when preventing because of the superconductive current limiter quench.
Vent valve V4 one end is communicated with the test Dewar through bleeder pipe 16, and the other end is through flowmeter 7 and atmosphere, and flowmeter 7 is used to measure the nitrogen flow of evaporation; The output of liquid nitrogen container 1 is communicated with test Dewar 3 through liquid nitrogen valve V1, liquid nitrogen fill valve V2 successively; Differential pressure pickup 9, pressure sensor 10 are installed in the test Dewar 3, and differential pressure pickup 9 is used for the pressure reduction of experiment with measuring Dewar 3 liquid heights, and pressure sensor 10 is used for the liquid nitrogen pressure of experiment with measuring Dewar 3; Temperature sensor 15 is installed in superconductive current limiter 13 surfaces; Temperature sensor 15 is used to measure the temperature of superconductive current limiter 13 each points; Vacuum measurement is regulated 8 and is installed on the outer wall of test Dewar 3, is used for the vacuum degree of experiment with measuring Dewar 3 vacuum interlayers; Vacuum pump 6 is communicated with the vacuum interlayer of test Dewar 3 through evacuation valve V5, is used for the vacuum interlayer of test Dewar 3 is vacuumized; Adsorbent 11 adopts molecular sieve, is placed on the bottom of the vacuum interlayer of test Dewar 3, is used to keep the high vacuum of long period.
Before on-test, superconductive current limiter 13 to be measured is installed in the test Dewar 3 through strutting piece 12.Open evacuation valve V5, vacuumize, after the vacuum degree of the vacuum interlayer of testing Dewar 3 reaches the vacuum requirement, close evacuation valve V5 and vacuum pump 6 successively, accomplish vacuumizing test Dewar 3 vacuum interlayers by 6 pairs of vacuum interlayers of testing Dewar 3 of vacuum pump.Open liquid nitrogen valve V1, liquid nitrogen fill valve V2; Fill liquid nitrogen to test Dewar 3, reach certain value, promptly test in the Dewar 3 the liquid nitrogen liquid levels and reach and be enough to guarantee that superconductive current limiter 13 is fully immersed in the liquid nitrogen until pressure difference shown in the differential pressure pickup 9; Close liquid nitrogen fill valve V2, stop to fill of liquid nitrogen.
In the process of the test, at first the refrigeration loss of 13 cryogenic systems of the superconductive current limiter under superconducting state is assessed.Switch control through to control circuit 14 makes control circuit 14 be in normal operating conditions, and promptly superconductive current limiter 13 is in superconducting state.Adjusting liquid nitrogen fill valve V2, vent valve V4 are in stability to system, and this moment shows as differential pressure pickup 9 and pressure sensor 10 readings are constant basically, gathers the data that this moment, flowmeter 7 recorded.Through theory analysis, calculating, can effectively be evaluated at the refrigeration loss of superconductive current limiter cryogenic system under the superconducting state.
Then, the switch control through to control circuit 14 makes control circuit 14 be in the short trouble state, at this moment superconductive current limiter 13 quench.Gather the data that this moment, pressure sensor 10 recorded.Through theory analysis, the bubble that research superconductive current limiter 13 is produced when quench is to the influence of refrigerating system pressure.When liquid nitrogen gasifies rapidly, when test Dewar 3 internal pressures sharply increased, safety valve V3 opened with pressure release automatically, and rupture disk 5 explosions in case of necessity are to guarantee safety.
After the test of a specification superconductive current limiter 13 is accomplished, close all appts and equipment.Through breaking off being connected of control circuit 14 and superconductive current limiter 13, unload bottom flange 2, with regard to the superconductive current limiter 13 of replaceable different size.Control circuit 14 with after new superconductive current limiter 13 is connected, is accomplished the replacing of superconductive current limiter 13.Other conditions are constant, repeat the test procedure of superconductive current limiter 13 before this, and the bubble that is produced when assessment and superconduction quench that the superconductive current limiter of changing 13 is carried out the loss of cryogenic system refrigeration is to the research of refrigerating system pressure influence.
Claims (1)
1. superconductive current limiter liquid nitrogen cryogenics system; Comprise that liquid nitrogen container (1), valve gap (2), test Dewar (3), heat-insulation layer (4), rupture disk (5), vacuum pump (6), flowmeter (7), vacuum measurement regulate (8), differential pressure pickup (9), pressure sensor (10), adsorbent (11), strutting piece (12), superconductive current limiter (13), control circuit (14), temperature sensor (15), bleeder pipe (16), liquid nitrogen valve (V1), liquid nitrogen fill valve (V2), safety valve (V3), vent valve (V4) and evacuation valve (V5); It is characterized in that: test Dewar (3) is connected through flange with valve gap (2); Superconductive current limiter (13) is supported by strutting piece (12) and is immersed in the test Dewar (3); The upper end of strutting piece (12) is connected with valve gap (2); Control circuit (14) is electrically connected with superconductive current limiter (13); Heat-insulation layer (4) is installed in valve gap (2) below, and safety valve (V3), rupture disk (5) are installed on the valve gap (2), and an end of vent valve (V4) is communicated with test Dewar (3) through bleeder pipe (16); The other end is through flowmeter (7) and atmosphere, and the output of liquid nitrogen container (1) is communicated with test Dewar (3) through liquid nitrogen valve (V1), liquid nitrogen fill valve (V2) successively; Differential pressure pickup (9), pressure sensor (10) are installed in the test Dewar (3); Temperature sensor (15) is installed in superconductive current limiter (13) surface; Vacuum measurement is regulated (8) and is installed on the outer wall of test Dewar (3), and vacuum pump (6) is communicated with through the vacuum interlayer of evacuation valve (V5) with test Dewar (3), and adsorbent (17) adopts molecular sieve, is placed on the bottom of the vacuum interlayer of test Dewar (3).
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| CN2011103439820A CN102496679A (en) | 2011-11-03 | 2011-11-03 | Liquid nitrogen low-temperature system for superconducting current limiter |
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| CN2011103439820A CN102496679A (en) | 2011-11-03 | 2011-11-03 | Liquid nitrogen low-temperature system for superconducting current limiter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832606A (en) * | 2012-09-21 | 2012-12-19 | 北京云电英纳超导电缆有限公司 | Integral insulation thermal isolation structure of high-voltage superconducting fault current limiter |
| CN103809031A (en) * | 2012-11-13 | 2014-05-21 | 上海电缆研究所 | Superconducting cable alternating-current power loss testing system |
| CN106782995A (en) * | 2016-12-30 | 2017-05-31 | 浙江大学 | The jetting type high-temperature superconductor cooling device and method of a kind of pressure differential |
| CN106847464A (en) * | 2016-12-30 | 2017-06-13 | 浙江大学 | The forced convertion high-temperature superconductor cooling device and method of a kind of pressure differential |
| CN108594036A (en) * | 2018-03-29 | 2018-09-28 | 北京航天试验技术研究所 | A kind of connected vessels type test device for superconducting tape energizing test |
| CN108649547A (en) * | 2018-03-28 | 2018-10-12 | 中国科学院电工研究所 | A kind of resistor-type high temperature superconducting malfunction current limiter |
| CN109307849A (en) * | 2018-12-04 | 2019-02-05 | 中国科学院上海微系统与信息技术研究所 | The method of SQUID measuring system and stable air pressure based on stable gas pressure |
| CN110931161A (en) * | 2019-10-25 | 2020-03-27 | 中国电力科学研究院有限公司 | High-voltage lead structure |
| 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 |
| CN112415302A (en) * | 2020-10-27 | 2021-02-26 | 西安电子科技大学 | Operation and test device and method for conduction cooling high-temperature superconducting cable |
| CN115111529A (en) * | 2022-08-02 | 2022-09-27 | 兰州理工大学 | Interlayer vacuum degree monitoring and alarming method and system for low-temperature Dewar |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832606A (en) * | 2012-09-21 | 2012-12-19 | 北京云电英纳超导电缆有限公司 | Integral insulation thermal isolation structure of high-voltage superconducting fault current limiter |
| CN103809031A (en) * | 2012-11-13 | 2014-05-21 | 上海电缆研究所 | Superconducting cable alternating-current power loss testing system |
| CN103809031B (en) * | 2012-11-13 | 2016-06-15 | 上海电缆研究所 | Hyperconductive cable AC loss test system |
| CN106782995A (en) * | 2016-12-30 | 2017-05-31 | 浙江大学 | The jetting type high-temperature superconductor cooling device and method of a kind of pressure differential |
| CN106847464A (en) * | 2016-12-30 | 2017-06-13 | 浙江大学 | The forced convertion high-temperature superconductor cooling device and method of a kind of pressure differential |
| CN106782995B (en) * | 2016-12-30 | 2018-05-15 | 浙江大学 | The jetting type high-temperature superconductor cooling device and method of a kind of pressure differential |
| CN108649547A (en) * | 2018-03-28 | 2018-10-12 | 中国科学院电工研究所 | A kind of resistor-type high temperature superconducting malfunction current limiter |
| CN108649547B (en) * | 2018-03-28 | 2019-11-15 | 中国科学院电工研究所 | A kind of resistor-type high temperature superconducting malfunction current limiter |
| CN108594036B (en) * | 2018-03-29 | 2020-12-15 | 北京航天试验技术研究所 | Communicating vessel type testing device for superconducting strip electrification test |
| CN108594036A (en) * | 2018-03-29 | 2018-09-28 | 北京航天试验技术研究所 | A kind of connected vessels type test device for superconducting tape energizing test |
| CN109307849A (en) * | 2018-12-04 | 2019-02-05 | 中国科学院上海微系统与信息技术研究所 | The method of SQUID measuring system and stable air pressure based on stable gas pressure |
| CN110931161A (en) * | 2019-10-25 | 2020-03-27 | 中国电力科学研究院有限公司 | High-voltage lead structure |
| 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 |
| CN112415302A (en) * | 2020-10-27 | 2021-02-26 | 西安电子科技大学 | Operation and test device and method for conduction cooling high-temperature superconducting cable |
| CN115111529A (en) * | 2022-08-02 | 2022-09-27 | 兰州理工大学 | Interlayer vacuum degree monitoring and alarming method and system for low-temperature Dewar |
| CN115111529B (en) * | 2022-08-02 | 2024-04-26 | 兰州理工大学 | Sandwich vacuum degree monitoring and alarming method and system for low-temperature Dewar |
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Application publication date: 20120613 |