Tension testing device for large-current-carrying high-temperature superconducting cable for fusion

Abstract

The invention relates to the technical field of superconducting cable tension testing devices, in particular to a large-current-carrying high-temperature superconducting cable tension testing device for fusion. One end of the cable connector is welded with a cable, and the other end of the cable connector is installed on the fixing assembly; and the current transmission assembly is arranged on the fixing assembly, is electrically connected with the cable joint, and is formed by connecting copper bars. The tension test device for the large-current-carrying high-temperature superconducting cable for fusion is high in test result precision, good in safety and reliability and suitable for complex environments such as low-temperature large current and high-intensity magnetic fields during tension test.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting cable tension testing devices, in particular to a tension testing device for a large current-carrying high-temperature superconducting cable used for fusion. Background Art

[0002] In the Tokamak device, high-temperature superconducting cables made of high-temperature superconducting materials such as rare earth barium copper oxide, as an important part of the magnet system, play an important role in transmitting large currents and generating strong magnetic fields. In the extreme operating environment of low temperature and strong magnetic field, the tensile mechanical properties of high-temperature superconducting cables are directly related to the stability and safety of the entire magnetic field system.

[0003] At present, the existing tensile test tooling uses copper braids or copper cables to connect conductive columns, which have a small current-carrying area and generate severe heat when a large current is passed, thereby affecting the accuracy of the tensile test results. In addition, the insulation layer of the copper braid or copper cable is relatively fragile at low temperatures and is easily cracked when displacement occurs after tension is applied. If it comes into contact with the Dewar equipment or the connecting rod when power is turned on, there will be safety hazards. Therefore, the existing high-temperature superconducting cable tensile test device performs large current tensile tests in a low-temperature environment, which has the problems of low accuracy of tensile test results and safety hazards.

[0004] Therefore, how to improve the accuracy and safety and reliability of large current tensile testing of high-temperature superconducting cables in low-temperature environments has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] The present invention provides a high-current-carrying high-temperature superconducting cable tension test device for fusion, which is used to solve the problem of how to improve the accuracy and safety and reliability of high-current tension testing of high-temperature superconducting cables in a low-temperature environment, which has become a technical problem to be solved urgently by those skilled in the art.

[0006] The present application provides a high-current-carrying high-temperature superconducting cable tension test device for fusion, comprising: Fixing components; Cable connector, one end of the cable is welded, and the other end is installed on the fixed component. The cable connector is a copper block; The current transmission component is installed on the fixed component and is electrically connected to the cable connector. The current transmission component is connected by copper bars.

[0007] In some embodiments, the number of the cable connectors and the number of the current transmission components are both two, and the cables are welded between the two cable connectors.

[0008] In some embodiments, the current transfer assembly includes: Horizontal copper busbar, electrically connected to the cable connector; The vertical copper busbar has one end connected to the horizontal copper busbar and the other end connected to the fixed component.

[0009] In some embodiments, it also includes: The base is installed at the end of the cable connector away from the cable.

[0010] In some embodiments, the base comprises: A circular disc with an internal thread in the middle; Two vertical plates are installed parallel to one side of the disc.

[0011] In some embodiments, it also includes: Adapter, rotatably installed on the base.

[0012] In some embodiments, the adapter includes: First horizontal board; The second horizontal board; A bolt connects the first horizontal plate and the second horizontal plate, and an end thereof is screwed with the disc.

[0013] In some embodiments, it also includes: The insulating member is an I-shaped structure and is installed between the adapter and the fixing component.

[0014] In some embodiments, the fixing assembly includes: a first mounting plate; A second mounting plate; A support rod, two ends of which are respectively fixedly connected to the first mounting plate and the second mounting plate; The connecting rod is installed on a side of the first mounting plate away from the supporting rod.

[0015] In some embodiments, the fixing assembly further comprises: Epoxy resin plate, sliding connection with connecting rod.

[0016] The beneficial effects of the present invention are as follows: The tension test device for a high-current-carrying high-temperature superconducting cable for fusion of the present invention selects a copper block as a cable joint, designs the current transmission component to be connected by a copper bar, and both the copper block and the copper bar are rectangular block structures, which can provide accurate and reliable tension test results, and is suitable for measuring the tension of a high-temperature superconducting cable in complex environments such as low temperature, large current and strong magnetic field, and has the following advantages: 1. The cable connector and current transmission assembly of the present application use copper blocks and copper bars, which have large cross-sectional areas and large current-carrying areas, and can transmit large currents. When a large current is passed into the high-temperature superconducting cable to be tested, the large current can be transmitted to the external circuit through the copper blocks and copper bars; 2. Compared with the copper braid or copper cable used in the prior art, which is prone to cracking when tension is applied at low temperatures, and there are safety hazards when contacting with the Dewar device or the connecting rod when power is turned on, the copper block and copper busbar of the present application are rectangular block structures, do not have the problem of cracking, and have high safety and reliability; 3. The contact area between the copper bars and between the copper block and the copper bar of the present application is large, which reduces the heat generation on the contact surface and improves the accuracy of the tensile test results; 4. When a large current is passed through a high-temperature superconducting cable, the required power lead will be thicker and heavier. The prior art directly immerses it in liquid nitrogen, which will cause its insulation layer to crack, posing a safety hazard. This application adopts a copper busbar connection design to transmit the current of the cable through a copper block and a copper busbar, and connects the power lead to the top of the vertical copper busbar to lead out the current. There is no need to throw the power lead into the nitrogen liquid, which is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a high-current-carrying high-temperature superconducting cable tension test device for fusion use of the present invention; Figure 2 yes Figure 1 The schematic diagram of the structure of the cable connector, base and adapter shown; Figure 3 yes Figure 1 The schematic diagram of the structure of the cable connector and the current transmission component is shown.

[0018] In the attached drawings, 1. cable connector; 2. cable; 3. horizontal copper busbar; 4. vertical copper busbar; 5. base; 51. disc; 52. vertical plate; 6. adapter; 61. first horizontal plate; 62. second horizontal plate; 63. bolt; 7. insulating member; 8. first mounting plate; 9. second mounting plate; 10. support rod; 11. connecting rod; 12. epoxy resin board; 13. tension rod. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] As described in the background technology, the traditional high-temperature superconducting cable tension test device is used to conduct tension test on the high-temperature superconducting cable by passing a large current in a low-temperature environment, which has low accuracy and poor safety and reliability. Therefore, how to improve the accuracy and safety and reliability of large current tension test in a low-temperature environment has become a technical problem that needs to be solved urgently by those skilled in the art.

[0021] To solve the above problems, refer to Figure 1 , Figure 2 and Figure 3 The present application provides a tensile test device for a high-current high-temperature superconducting cable for fusion, comprising: a fixing component, a cable joint 1 and a current transmission component installed on the fixing component, wherein the fixing component mainly supports the overall structure of the cable, and the current transmission component mainly introduces external current into the cable joint 1. There are two cable joints 1 and two current transmission components, and a cable joint 1 is welded at each end of a high-current high-temperature superconducting cable 2, and the cable joint 1 is electrically connected to the current transmission component, and the current transmission component is connected to a power lead. The cable connector 1 is a copper block, and the current transmission component is connected by a copper busbar. The copper block and the copper busbar are both rectangular block structures. The cross-sectional area of ​​the copper block and the copper busbar is large, and the current-carrying area of ​​the current transmission is large. The contact area between the copper block and the copper busbar and between the copper busbars is large, which can transmit large currents, reduce the heat of the contact surface, and have high test accuracy. Compared with the copper braid or copper cable in the prior art, it is easy to crack when tension is applied at low temperatures, and there are safety hazards in contact with the Dewar equipment or the connecting rod when power is turned on. The copper block and the copper busbar of the present application are rectangular block structures, there is no cracking problem, and the safety and reliability are high. The tensile test device of the present application can provide accurate and reliable tensile test results, and the measured high-temperature superconducting cable is particularly suitable for complex environments such as low temperature, large current and strong magnetic field.

[0022] It should be noted that the cable connector 1 is a flat rectangular copper, and a deep hole is provided inside one end of the cable connector 1 along the length direction for welding the cable 2, thereby firmly fixing the cable 2 between the two cable connectors 1. When performing a tensile test, the cable 2 can be prevented from being disconnected from the cable connector 1, and the safety and reliability are high. Six holes are provided in the middle of the larger rectangular surface of the cable connector 1 for connection and fixing with the horizontal copper bus 3 of the current transmission component.

[0023] Preferably, the fixing assembly, cable connector 1, cable 2 and current transmission assembly are all arranged vertically, and the overall structure is arranged longitudinally, fully considering the needs of engineering practice, and performing tension tests on the cable in the vertical direction, thereby reducing the influence of gravity on the test results and improving the accuracy of the test results.

[0024] Specifically, in the exemplary embodiment, in the vertical direction, the cable joint 1 located at the upper part is defined as the upper cable joint 1, the cable joint 1 located at the lower part is defined as the lower cable joint 1, the current transmission component electrically connected to the upper cable joint 1 is the upper current transmission component, and the current transmission component electrically connected to the lower cable joint 1 is the lower current transmission component, then the current transmission path is: upper current transmission component-upper cable joint 1-cable-lower cable joint 1-lower current transmission component.

[0025] Preferably, the current transmission component includes: a horizontal copper bar 3 and a vertical copper bar 4, the horizontal copper bar 3 is electrically connected to the cable connector 1, one end of the vertical copper bar 4 is connected to the horizontal copper bar 3, and the other end is connected to the fixed component. Exemplarily, the horizontal copper bar 3 is a flat rectangular copper block, and 6 holes are opened on one side of the horizontal copper bar 3 for connecting with the cable connector 1. The larger contact area can reduce the contact resistance, thereby reducing the effect of heat on the superconducting cable 2; 3 holes are opened on the other side of the horizontal copper bar 3 for connecting with the vertical copper bar 4; the overall design of the horizontal copper bar 3 is relatively thick in order to ensure sufficient current-carrying area and reduce heat generation during current flow testing.

[0026] The vertical copper bar 4 is a flat rectangular copper block with three holes at both ends. The upper end is used to connect with the epoxy resin board 12 and the power lead to play the role of fixing and passing current.

[0027] Preferably, the tensile testing device of the present application further includes: a base 5, which is installed at one end of the cable connector 1 away from the cable 2. The base 5 is made of copper material, and there are two of them, which are installed at the top of the upper cable connector 1 and the bottom of the lower cable connector 1 respectively. The base 5 is a U-shaped structure, and the base 5 includes: a disc 51 and two vertical plates 52. An internal thread is provided in the middle of the disc 51, and the two vertical plates 52 are installed in parallel on one side of the disc 51. The two vertical plates 52 are provided with mounting holes, and the upper and lower parts of the cable connector 1 are provided with mounting holes. One end of the cable connector 1 is inserted between the two vertical plates 52 of the base 5, and then the base 5 is detachably connected to the cable connector 1 by passing through the mounting holes on the vertical plates 52 and the mounting holes on the cable connector 1. The base 5 can be firmly fixed to the cable connector 1, thereby improving reliability.

[0028] Preferably, the tensile test device of the present application further includes: an adapter 6, which is rotatably mounted on the base 5. The adapter 6 is made of copper material and there are two of them, which are respectively mounted on the side of the base 5 away from the cable connector 1. That is to say, one adapter 6 is mounted on each base 5. The base 5 located in the upper part is defined as the upper base 5, and the base 5 located in the lower part is defined as the lower base 5. The adapter 6 includes: a first cross plate 61, a second cross plate 62 and a bolt 63. The bolt 63 passes through the first cross plate 61 and the second cross plate 62 arranged in parallel, and the end of the bolt 63 passes through the second cross plate 62. That is to say, the adapter 6 has a T-shaped structure. A screw hole is provided on the first cross plate 62 for installation and fixation. When installing the adapter 6, the end of the bolt 63 is screwed with the internal thread of the disc 51, so as to detachably connect the adapter 6 with the base 5, and the second cross plate 62 abuts against the base 5. In actual use, when the direction angle between the vertical plate 52 of the base 5 and the cable connector 1 is inappropriate, the cable connector 1 cannot be directly inserted between the two vertical plates 52 of the base 5. By rotating the adapter 6, the adapter 6 drives the base 5 to rotate, and then drives the two vertical plates 52 of the base 5 to rotate until the two vertical plates 52 of the base 5 are parallel to the cable connector 1, that is, the cable connector 1 can be inserted between the two vertical plates 52 of the base 5. By providing the adapter 6, it is convenient to adjust the direction angle of the base 5, and then realize the installation of the base 5 and the cable connector 1.

[0029] Preferably, the tensile test device of the present application further includes: an insulating part 7, which is made of epoxy resin material and has an I-shaped structure, and is installed between the adapter 6 and the fixing component. The insulating part 7 separates the part with current from the fixing component to prevent current shunt. The insulating part 7 includes two parallel circular plates and a vertical rod connecting the two circular plates. The number of the insulating parts 7 is two. The insulating part 7 located in the upper part is defined as the upper insulating part 7, and the insulating part 7 located in the lower part is defined as the lower insulating part 7. The two circular plates of the upper insulating part 7 are respectively fixedly connected to the tensile rod 13 and the upper adapter 6, and the insulation between the tensile rod 13 and the upper adapter 6 is realized through the vertical rod; the two circular plates of the lower insulating part 7 are respectively fixedly connected to the fixing component and the lower adapter 6, and the insulation between the fixing component and the lower adapter 6 is realized through the vertical rod.

[0030] Preferably, the fixing assembly includes: a first mounting plate 8, a second mounting plate 9, a support rod 10 and a connecting rod 11, the two ends of the support rod 10 are fixedly connected to the first mounting plate 8 and the second mounting plate 9 respectively, the connecting rod 11 is installed on the side of the first mounting plate 8 away from the support rod 10, the first mounting plate 8 and the second mounting plate 9 are both made of round stainless steel materials, and the diameter of the first mounting plate 8 is larger than that of the second mounting plate 9, the support rod 10 and the connecting rod 11 are both made of stainless steel, the number of the support rod 10 is 3, and the number of the connecting rod 11 is 4. A through hole is provided in the middle of the first mounting plate 8, and the tension rod 13 passes through the through hole in the middle of the first mounting plate 8. The bottom of the lower insulating member 7 is fixedly connected to the second mounting plate 9. The first mounting plate 8, the second mounting plate 9 and the support rod 10 constitute a frame structure, which provides support for the cable tension test device of the present application, and the cable 2, the cable connector 1, the two bases 5, the two adapters 6 and the two insulating members 7 are all located between the first mounting plate 8 and the second mounting plate 9.

[0031] Preferably, the fixing assembly also includes: an epoxy resin plate 12, and the epoxy resin plate 12 is slidably connected to the connecting rod 11. The number of epoxy resin plates 12 is 2, and the epoxy resin plates 12 are fixedly connected to the vertical copper bus 4. Two of the connecting rods 11 are respectively connected to the two epoxy resin plates 12 through a riding card, and the epoxy resin plates 12 can have an axial relative displacement with the connecting rod 11. The epoxy resin plates 12 can move up and down along the connecting rod 11. The connecting rod 11 rises or falls and then drives the vertical copper bus 4 to rise or fall, ensuring that the vertical copper bus 4 will not shake, avoiding safety hazards, and ensuring the stability of current transmission. Exemplarily, the epoxy resin plate 12 is in the shape of a flat rectangular parallelepiped, and 6 holes are opened on one side of the epoxy resin plate 12 for connecting and fixing with the vertical copper bus 4; two rows of holes are opened on the other side for connecting with the upper connecting rod 11.

[0032] When conducting a tension test, the cable tension test device of the present application needs to be installed as follows: weld the two ends of the cable 2 to the two cable connectors 1 respectively, install the connecting rod 11 on the lifting platform of the tension device, and install the tension rod 13 through the first mounting plate 8 to the tension device. The tension rod 13 is the part that applies tension to the cable 2, and tension can be applied to the cable 2 by moving the tension rod 13 up and down. The upper ends of the two vertical copper bars 4 are connected to the power leads on one side away from the epoxy resin board 12. After the cable tension test device of the present application is immersed in the coolant for cooling, the experimental test of the tension performance of the large current-carrying high-temperature superconducting cable can be carried out.

[0033] The tensile test device of the present application has the following beneficial effects: the overall design fully considers the needs of engineering practice, and performs tensile test on the cable 2 in the vertical direction, reducing the influence of gravity on the test results; the horizontal copper bar 3, the vertical copper bar 4 and the epoxy resin plate 12 that can move up and down with the cable connector 1 have a large margin for the length range of the tested superconducting cable 2; the design of the adapter 6 allows the test device to be connected through the adapter 6 even when the two cable connectors 1 are not aligned during welding; the power lead required when a large current is passed will be thicker and heavier, and soaking in liquid nitrogen will cause its insulation layer to crack, the horizontal copper bar 3 and the vertical copper bar 4 can directly lead the current from the top of the device to the cable connector 1, and the power lead can be directly connected to the top of the device without soaking in liquid nitrogen, thereby improving safety and reliability; at the same time, when the superconducting cable 2 is tested, the vertical copper bar 4, the horizontal copper bar 3 and the cable connector 1 through which the current flows are designed as rectangular blocks, which are convenient for processing and also increase the contact area between each part, reduce the heat on the contact surface, and improve the accuracy of the test results.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0038] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high-current-carrying high-temperature superconducting cable tension test device for fusion, characterized in that: include: Fixing components; A cable connector, one end of which is welded with a cable and the other end is mounted on the fixing assembly, wherein the cable connector is a copper block; The current transmission component is installed on the fixing component and is electrically connected to the cable connector. The current transmission component is formed by connecting copper bars.

2. The high-current-carrying high-temperature superconducting cable tension test device for fusion according to claim 1, characterized in that: The number of the cable connectors and the number of the current transmission components are both 2, and the cables are welded between the 2 cable connectors.

3. The high current carrying high temperature superconducting cable tension test device for fusion according to claim 1, characterized in that: The current transmission component comprises: A horizontal copper busbar, electrically connected to the cable connector; A vertical copper bar has one end connected to the horizontal copper bar and the other end connected to the fixing assembly.

4. The high current carrying high temperature superconducting cable tension test device for fusion according to claim 1, characterized in that: Also includes: The base is installed at one end of the cable connector away from the cable.

5. The high current carrying high temperature superconducting cable tension test device for fusion according to claim 4, characterized in that: The base comprises: A circular disc with an internal thread in the middle; Two vertical plates are installed in parallel on one side of the disc.

6. The high current carrying high temperature superconducting cable tension test device for fusion according to claim 5, characterized in that: Also includes: The adapter is rotatably mounted on the base.

7. The high current carrying high temperature superconducting cable tension test device for fusion according to claim 6, characterized in that: The adapter comprises: First horizontal board; The second horizontal board; A bolt connects the first transverse plate and the second transverse plate, and an end thereof is screwed with the disc.

8. The high current carrying high temperature superconducting cable tension test device for fusion according to claim 7, characterized in that: Also includes: The insulating member is an I-shaped structure and is installed between the adapter and the fixing assembly.

9. The high current carrying high temperature superconducting cable tension test device for fusion according to any one of claims 1 to 8, characterized in that: The fixing assembly comprises: a first mounting plate; A second mounting plate; A support rod, two ends of which are respectively fixedly connected to the first mounting plate and the second mounting plate; A connecting rod is installed on a side of the first mounting plate away from the supporting rod.

10. The high current carrying high temperature superconducting cable tension test device for fusion according to claim 9, characterized in that: The fixing assembly also includes: An epoxy resin plate is slidably connected to the connecting rod.

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