CN209821330U - High-temperature superconducting strip and testing device for cable joint thereof - Google Patents
High-temperature superconducting strip and testing device for cable joint thereof Download PDFInfo
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- CN209821330U CN209821330U CN201822173172.5U CN201822173172U CN209821330U CN 209821330 U CN209821330 U CN 209821330U CN 201822173172 U CN201822173172 U CN 201822173172U CN 209821330 U CN209821330 U CN 209821330U
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Abstract
The utility model belongs to the technical field of high-temperature superconducting design, in particular to a testing device and a testing method for a high-temperature superconducting strip and a cable joint thereof, which comprises a Dewar tank, a pressure source component, an electrode component and a test board; the test joint can be provided with a test environment with multiple parallel strips, different pressure areas and different pressures in a low-temperature environment. The design of multiple test loops enables the device to have universality and high efficiency, multiple samples can be tested in parallel aiming at the test of a single-strip connector, the test efficiency is improved, and multiple strip materials can be tested in parallel aiming at a cable connector; the design of the replaceable pressure head can ensure that the stress of the joint sample is uniform in all directions, the damage of the strip caused by edge extrusion is avoided, and different pressure areas can be provided; the quenching protection circuit is added in the testing device, when the sample is quenched overtime, the current can be quickly shunted to the quenching protection circuit, and the sample is prevented from being burnt out due to the fact that large current is continuously introduced after quenching.
Description
Technical Field
The utility model belongs to the technical field of the high temperature superconduction design, concretely relates to high temperature superconduction strip and testing arrangement of cable joint thereof.
Background
The high-temperature superconductivity can be used for manufacturing magnets with higher operation temperature and stronger magnetic field, is an important option for designing a future fusion reactor magnet system, the operation cost of the system can be obviously reduced by increasing the operation temperature, the volume of the system can be obviously reduced by increasing the magnetic field, and the control difficulty of the system can be reduced. Meanwhile, the adoption of high-temperature superconductivity can also enable the fusion reactor magnet to be designed into a detachable structure more easily, so that the construction and maintenance cost of the reactor magnet and the reactor internal parts is greatly simplified, and the economic benefit is improved.
The practical high-temperature superconducting material mostly has a belt-shaped structure, such as a ReBCO coating high-temperature superconducting belt material, the belt material is of a multilayer structure, and a main layer structure comprises a stabilizing layer, a superconducting layer and a base body layer. The stabilizing layer is generally copper and silver, and plays a role in shunting current to protect the superconducting layer; the substrate layer is typically hastelloy and provides sufficient mechanical strength to the strip. Therefore, the joint technology of the high-temperature superconducting tape and the cable is obviously different from the traditional low-temperature superconducting technology, and a new design on a lap joint mode, a structure and a process is needed.
The thermal power of the magnet directly affects the thermal stability and cooling power of the magnet, while in steady state operation of the detachable magnet, the thermal power is mainly derived from the resistive heat of the detachable joint, so the joint is one of the key components of the detachable magnet. The main types of detachable joints include crimp joints and low temperature weld joints. The detachable crimping connector has the advantages of simple process and convenience in disassembly and assembly, but the controllability of the connector resistance is poor; the detachable welding joint has the advantages of low joint resistance and strong controllability, but the process is relatively complex and the disassembly and the assembly are difficult.
In order to deeply research the influences of factors such as treatment process, contact material, pressure intensity, joint length and the like on joint resistance and current-carrying characteristics, the conventional high-temperature superconducting tape and cable joint test thereof is in a relatively original form, and is mainly based on a tape critical current test device to carry out simple total resistance measurement, so that a test device capable of providing multiple tapes in parallel connection and providing different pressure areas and different pressures is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned defect that prior art exists, provide a joint resistance testing arrangement of high temperature superconducting tape and cable thereof, can provide the test environment that many strips are parallelly connected, different pressure area, different pressure under the low temperature environment for test connection.
The technical scheme of the utility model as follows:
a testing device for high-temperature superconducting strips and cable joints thereof comprises a Dewar tank, a pressure source component, an electrode component and a test bench;
in the testing device, a Dewar flask provides a low-temperature testing environment, and the interior of the wall of the Dewar flask is a vacuum environment;
the pressure source component is fixed in the center of the cover plate by using a rod, and the cover plate is provided with a heavy-load resisting spring, a lower movable spring plate, a pressure spring, an upper movable spring plate, a pressure sensor, a stress application screw and a stress application wrench in sequence from top to bottom;
the stress application spanner realizes manual pressure application, the pressure acts on the pressure sensor and is transmitted to the movable spring plate and the pressure spring, and the anti-gravity spring is used for offsetting the gravity of the movable spring plate and the spring and reducing the deviation between a pressure measurement value and an actual value;
the pressure sensor is arranged at a higher position, and the control precision of the pressure can be adjusted by changing the stroke of the pressure spring;
the pressure source component positioned below the cover plate is a pressure rod and a replaceable pressing block, the upper end of the pressure rod is connected with a lower movable spring plate, the pressure is transmitted to the replaceable pressing block, and finally the pressure acts on the test sample;
the sample is clamped between the T-shaped decompression table and the pressing block, the replaceable pressing block is contacted with the pressing rod through an arc surface, and the side surface is provided with a hole for connection;
the test bench is a sample mounting and testing area, the middle part of the test bench is close to the press block, two ends of the test bench are connected with the current lead and the platform pull rod, and 5 pairs of electrode mounting grooves and corresponding quench protection loops are arranged;
the quench protection loop is composed of copper bars with higher residual resistivity and is connected with the corresponding test loop in parallel;
the electrode pressing plate is used for fixing the end part of the test sample and realizing the electric connection between the sample and the electrode; the middle insulating plate is used for realizing the middle insulation between the quench protection loop and the test sample; the T-shaped decompression table is used for reducing the pressure applied to the middle insulating plate;
the electrode part is structurally characterized in that one end of an electrode connecting plate is connected to an external cable, the other end of the electrode connecting plate is connected with a current lead, the current lead extends to the liquid nitrogen or liquid helium environment from the upper part of a cover plate, the lower end of the current lead is fixed on a bearing platform and insulated from the bearing platform, and is simultaneously contacted with a detachable electrode block, and the electrode block is connected with a sample.
The test sample is a high-temperature superconducting strip or a cable joint thereof, the sample is arranged between electrode blocks of the same loop and is fixed between a pressing block and a T-shaped decompression table, wherein the joint is opposite to the pressing block, the pressing block acts on the sample, the pressure is transmitted to the T-shaped decompression table, the pressure is reduced and then is dispersed to a middle insulating base plate, grooves are processed on the middle insulating base plate and are used for containing a quench protection loop and liquid nitrogen, the quench time occurs, current mainly passes through the quench protection loop, the pressure is finally transmitted to a bearing platform, the bearing platform is positioned by six platform pull rods and forms a reaction frame together with a cover plate and a press rod;
the dewar tank is filled with liquid nitrogen or liquid helium, and the temperature can reach about 77K and 4.2K respectively.
The underside of the cover of the dewar is filled with a foam insulation layer to reduce heat conduction
The pressure source of the device adopts a manual screw rod force application mode, and in addition, a hydraulic cylinder or a pneumatic cylinder can be used as the pressure source, wherein the hydraulic cylinder or the pneumatic cylinder can be electrically driven or manually operated.
The briquetting width is greater than the strip width of surveying, and the chamfer processing is done to the lower limb of stress surface length direction, avoids appearing the marginal extrusion when applying great pressure, destroys the sample.
The sample loading mode comprises pressure connection and welding.
The electrode platen is crimped to the sample and electrode block and connected to a current lead.
The sample and the electrode block are connected to a current lead through the electrode pressing plate after being welded.
The beneficial effects of the utility model reside in that:
the connector testing device capable of realizing the testing environments of multiple parallel-connection strips, different pressure areas, different pressures and the like is provided for researching the detachable connectors of the high-temperature superconducting strips and the cables thereof, and the problem that the single-strip connector can only be tested under different pressures in a common testing experiment is solved.
The design of multiple test loops enables the device to have universality and high efficiency, multiple samples can be tested in parallel aiming at the test of a single-strip connector, the test efficiency is improved, and multiple strip materials can be tested in parallel aiming at a cable connector;
the design of the replaceable pressure head can ensure that the stress of the joint sample is uniform in all directions, the damage of the strip caused by edge extrusion is avoided, and different pressure areas can be provided;
the quenching protection circuit is added in the testing device, when the sample is quenched overtime, the current can be quickly shunted to the quenching protection circuit, and the sample is prevented from being burnt out due to the fact that large current is continuously introduced after quenching.
Drawings
Fig. 1 is a schematic structural view of a high-temperature superconducting joint testing device according to the present invention.
Fig. 2 is a cross sectional view of the structure of the high temperature superconducting joint testing apparatus of the present invention.
Fig. 3 is a schematic structural diagram of the high-temperature superconducting sample test bench of the present invention.
Fig. 4 is a cross sectional view of the structure of the high temperature superconducting sample test bed of the present invention.
In the figure: 10-a dewar tank; 11-a cover plate; 20-bearing platform; 21-a platform pull rod; 22-a compression bar; 23-briquetting; 24-a counter weight spring; 25-a pressure spring; 26-a movable spring plate; 27-a stress application screw; 28-force application spanner; 29-a pressure sensor; 30-current leads; 31-electrode connection plate.
20-bearing platform; 21-a platform pull rod; 22-a compression bar; 23-replaceable briquette; 32-quench protection circuit; 33-a detachable electrode block; 40-electrode platen; 41-intermediate insulating pad; 42-T-shaped decompression table.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model discloses a high temperature superconducting tape and testing arrangement of cable joint thereof includes following part: including a dewar 10, pressure source components 20-29, electrode components 30-33 and test stations 40-43.
In the testing device, a Dewar flask 10 provides a low-temperature testing environment, and liquid nitrogen or liquid helium is filled in the Dewar flask, so that the temperature can reach about 77K and 4.2K respectively. The interior of the wall of the dewar is a vacuum environment, and the lower side of the cover plate 11 is filled with a foam heat insulation layer to reduce heat conduction.
The pressure source unit is fixed at the center of the cover plate 11 using a rod for providing a pressure with an error of less than 1% in the range of 0-3200 kgf. From the cover plate 11, there are a counter spring 24, a lower movable spring plate 26, a pressure spring 25, an upper movable spring plate 26, a pressure sensor 29, an energizing screw 27, and an energizing wrench 28 in this order. In the technical scheme, the stress application wrench is used for realizing manual pressure application, and the pressure acts on the pressure sensor and is transmitted to the movable spring plate and the pressure spring. The anti-gravity spring 24 is used to counteract the gravity of the movable spring plate 26 and the spring 25, and reduce the deviation between the measured value and the actual value of the pressure. The pressure sensor 29 is used to measure the applied stress and is arranged at a higher position to reduce the influence of low temperature on the measurement accuracy. By changing the stroke of the pressure spring 25, the control accuracy of the pressure can be adjusted. The pressure source adopted in the technical scheme is a manual screw force application mode, and in addition, a hydraulic cylinder or a pneumatic cylinder can be used as the pressure source, wherein the hydraulic cylinder or the pneumatic cylinder can be electrically driven or manually driven.
The pressure source components positioned below the cover plate 11 are a pressure rod 22 and a replaceable pressing block 23, the upper end of the pressure rod 22 is connected with a lower movable spring plate 26, the pressure is transmitted to the replaceable pressing block 23, and finally the pressure acts on the test sample. The sample is clamped between the T-shaped vacuum table 42 and the compact middle 23. Adopt the arc surface contact between removable briquetting 23 and the depression bar 22, the side trompil is connected, and the advantage of design like this is: 1. the pressure head and the sample realize automatic adjustment in the process of pressing, so that the horizontal pressure of the pressed strip is uniform; 2. the contact surface is large, so that the stress of the pressure head and the pressure rod is reduced; 3. and parts are convenient to machine and replace. The width of the pressing block 23 is slightly larger than the width of the measured strip, and the lower edge of the stress surface in the length direction is chamfered, so that edge extrusion is avoided when large pressure is applied, and the sample is prevented from being damaged.
The test bench is a sample mounting and testing area, the middle part of the test bench is close to the pressing block 23, the two ends of the test bench are connected with the current lead 30 and the platform pull rod 21, and 5 pairs of electrode 33 mounting grooves and corresponding quench protection loops 32 are arranged. The quench protection circuit 32 is formed by a copper bar with a high residual resistivity, and is connected in parallel with the corresponding test circuit. The electrode pressing plate 40 is used for fixing the end part of the test sample and realizing the electric connection between the sample and the electrode; the middle insulating plate 41 is used for realizing the middle insulation between the quench protection loop 32 and the test sample; the T-shaped decompression table 42 serves to reduce the pressure applied to the intermediate insulating plate 41.
A joint testing device for high-temperature superconducting tapes and cables thereof comprises: 1. a dewar 10; 2. pressure source components 20-29; 3. electrode parts 30-33; 4. test stations 40-43. The Dewar type electrode component is used for providing a low-temperature test environment, the pressure source component provides various pressure loads, the electrode component is used for introducing test current, and the test bench is used for bearing a test sample.
The test sample is a high temperature superconducting tape or a cable joint thereof, and the sample is installed between the electrode blocks 33 of the same circuit and fixed between the pressing block 23 and the T-shaped decompression table 42, wherein the joint is opposite to the pressing block 23. The sample loading mode comprises a pressure connection mode and a welding mode, and the specific implementation is selected according to the sample type and the experiment requirement. The pressure block 23 applies pressure to the sample, and the pressure is transmitted to the T-shaped decompression table 42, and the pressure is reduced and dispersed to the intermediate insulating pad 41. The intermediate insulating pad 41 is provided with a groove for accommodating the quench protection circuit 32 and liquid nitrogen. When quench occurs, the current mainly passes through the quench protection circuit 32, so that the sample is prevented from being burnt out, and the heat generated by the circuit is absorbed by a refrigerant. The pressure is finally transmitted to a force bearing platform 20, the force bearing platform 20 is positioned by six platform pull rods 21, and the six platform pull rods, the cover plate 11 and the press rod 22 form a reaction frame together.
The electrode assembly and test sample form a test loop that needs to be completely immersed in liquid helium or liquid nitrogen. The structure of the electrode part is as follows: one end of the electrode connecting plate 31 is connected to an external cable, the other end of the electrode connecting plate is connected with a current lead 30, the current lead 30 extends from the upper part 11 of the cover plate to a liquid nitrogen or liquid helium environment, and the lower end of the current lead 30 is fixed on the force bearing platform 20 and insulated from the force bearing platform and is simultaneously contacted with a detachable electrode block 33. Connection of electrode block 33 to sample: 1. the electrode pressing plate 40 is pressed and connected with the sample and the electrode block 33 and is connected with the current lead 30, and is characterized by rapid disassembly and assembly; 2. the sample is welded to the electrode block 33 and then connected to the current lead 30 through the electrode holder 40, and is characterized by a small resistance at the tip. Advantages of multiple separate electrode components: 1. the multi-path parallel test can be simultaneously carried out aiming at the single-belt joint, so that the test efficiency is improved, and the parallel installation and test of five samples can be realized in the example; 2. the multi-path parallel connection can realize the parallel connection of multiple strips, namely the test of a cable joint.
Claims (9)
1. A testing device for high-temperature superconducting strips and cable joints thereof comprises a Dewar tank, a pressure source component, an electrode component and a test bench;
the method is characterized in that: in the testing device, a Dewar flask provides a low-temperature testing environment, and the interior of the wall of the Dewar flask is a vacuum environment;
the pressure source component is fixed in the center of the cover plate by using a rod, and the cover plate is provided with a heavy-load resisting spring, a lower movable spring plate, a pressure spring, an upper movable spring plate, a pressure sensor, a stress application screw and a stress application wrench in sequence from top to bottom;
the stress application spanner realizes manual pressure application, the pressure acts on the pressure sensor and is transmitted to the movable spring plate and the pressure spring, and the anti-gravity spring is used for offsetting the gravity of the movable spring plate and the spring and reducing the deviation between a pressure measurement value and an actual value;
the pressure sensor is arranged at a higher position, and the control precision of the pressure can be adjusted by changing the stroke of the pressure spring;
the pressure source component positioned below the cover plate is a pressure rod and a replaceable pressing block, the upper end of the pressure rod is connected with a lower movable spring plate, the pressure is transmitted to the replaceable pressing block, and finally the pressure acts on the test sample;
the sample is clamped between the T-shaped decompression table and the pressing block, the replaceable pressing block is contacted with the pressing rod through an arc surface, and the side surface is provided with a hole for connection;
the test bench is a sample mounting and testing area, the middle part of the test bench is close to the press block, two ends of the test bench are connected with the current lead and the platform pull rod, and 5 pairs of electrode mounting grooves and corresponding quench protection loops are arranged;
the quench protection loop is composed of copper bars with higher residual resistivity and is connected with the corresponding test loop in parallel;
the electrode pressing plate is used for fixing the end part of the test sample and realizing the electric connection between the sample and the electrode; the middle insulating plate is used for realizing the middle insulation between the quench protection loop and the test sample; the T-shaped decompression table is used for reducing the pressure applied to the middle insulating plate;
the electrode part is structurally characterized in that one end of an electrode connecting plate is connected to an external cable, the other end of the electrode connecting plate is connected with a current lead, the current lead extends to the liquid nitrogen or liquid helium environment from the upper part of a cover plate, the lower end of the current lead is fixed on a bearing platform and insulated from the bearing platform, and is simultaneously contacted with a detachable electrode block, and the electrode block is connected with a sample.
2. The apparatus for testing a high temperature superconducting tape and a cable joint thereof according to claim 1, wherein: the test sample is a high-temperature superconducting strip or a cable joint thereof, the sample is installed between electrode blocks of the same loop and is fixed between a pressing block and a T-shaped decompression table, wherein the joint is opposite to the pressing block, the pressing block acts on the sample, the pressure is transmitted to the T-shaped decompression table, the pressure is dispersed to a middle insulating base plate after being reduced, grooves are processed on the middle insulating base plate and are used for containing a quench protection loop and liquid nitrogen, the quench time occurs, current mainly passes through the quench protection loop, the pressure is finally transmitted to a bearing platform, the bearing platform is positioned by six platform pull rods and forms a reaction frame together with a cover plate and a press rod.
3. The apparatus for testing a high temperature superconducting tape and a cable joint thereof according to claim 1, wherein: the dewar tank is filled with liquid nitrogen or liquid helium, and the temperature can reach about 77K and 4.2K respectively.
4. The apparatus for testing a high temperature superconducting tape and a cable joint thereof according to claim 1, wherein: the underside of the cover of the dewar is filled with a foam insulation layer to reduce heat conduction.
5. The apparatus for testing a high temperature superconducting tape and a cable joint thereof according to claim 1, wherein: the pressure source of the device adopts a manual screw rod force application mode, and in addition, a hydraulic cylinder or a pneumatic cylinder can be used as the pressure source, wherein the hydraulic cylinder or the pneumatic cylinder can be electrically driven or manually operated.
6. The apparatus for testing a high temperature superconducting tape and a cable joint thereof according to claim 1, wherein: the briquetting width is greater than the strip width of surveying, and the chamfer processing is done to the lower limb of stress surface length direction, avoids appearing the marginal extrusion when applying big pressure, destroys the sample.
7. The apparatus for testing a high temperature superconducting tape and a cable joint thereof according to claim 1, wherein: the sample loading mode comprises pressure connection and welding.
8. The apparatus for testing a high temperature superconducting tape and a cable joint thereof according to claim 1, wherein: the electrode platen is crimped to the sample and electrode block and connected to a current lead.
9. The apparatus for testing a high temperature superconducting tape and a cable joint thereof according to claim 1, wherein: the sample and the electrode block are connected to a current lead through the electrode pressing plate after being welded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822173172.5U CN209821330U (en) | 2018-12-24 | 2018-12-24 | High-temperature superconducting strip and testing device for cable joint thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822173172.5U CN209821330U (en) | 2018-12-24 | 2018-12-24 | High-temperature superconducting strip and testing device for cable joint thereof |
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| CN209821330U true CN209821330U (en) | 2019-12-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366879A (en) * | 2018-12-24 | 2020-07-03 | 核工业西南物理研究院 | Testing device and testing method for high-temperature superconducting strip and cable joint thereof |
| CN111411823A (en) * | 2020-03-26 | 2020-07-14 | 北京大学 | Ultrahigh vacuum low-temperature sample table connecting lock and control method thereof |
| CN112098468A (en) * | 2020-11-18 | 2020-12-18 | 东部超导科技（苏州）有限公司 | Experimental method and experimental device for liquid nitrogen soaking pressure resistance of high-temperature superconducting strip |
| CN114459887A (en) * | 2022-01-10 | 2022-05-10 | 首钢集团有限公司 | Coke compressive strength measuring tool and device |
| CN115406751A (en) * | 2022-10-31 | 2022-11-29 | 核工业西南物理研究院 | Welding type conduction experiment clamp for high-temperature superconducting cable and method thereof |
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2018
- 2018-12-24 CN CN201822173172.5U patent/CN209821330U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366879A (en) * | 2018-12-24 | 2020-07-03 | 核工业西南物理研究院 | Testing device and testing method for high-temperature superconducting strip and cable joint thereof |
| CN111411823A (en) * | 2020-03-26 | 2020-07-14 | 北京大学 | Ultrahigh vacuum low-temperature sample table connecting lock and control method thereof |
| CN111411823B (en) * | 2020-03-26 | 2021-03-23 | 北京大学 | Ultrahigh vacuum low-temperature sample table connecting lock and control method thereof |
| CN112098468A (en) * | 2020-11-18 | 2020-12-18 | 东部超导科技（苏州）有限公司 | Experimental method and experimental device for liquid nitrogen soaking pressure resistance of high-temperature superconducting strip |
| CN114459887A (en) * | 2022-01-10 | 2022-05-10 | 首钢集团有限公司 | Coke compressive strength measuring tool and device |
| CN114459887B (en) * | 2022-01-10 | 2023-11-10 | 首钢集团有限公司 | Coke compressive strength measures frock and device |
| CN115406751A (en) * | 2022-10-31 | 2022-11-29 | 核工业西南物理研究院 | Welding type conduction experiment clamp for high-temperature superconducting cable and method thereof |
| CN115406751B (en) * | 2022-10-31 | 2023-02-03 | 核工业西南物理研究院 | Welding type conduction experiment fixture for high-temperature superconducting cable and method thereof |
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