Method and device for determining the overlap length of a superconducting cable and superconducting cable

Abstract

The application relates to a superconducting cable overlap length determination method and device, a superconducting cable, a computer device, a computer readable storage medium and a computer program product, which comprises the following steps: obtaining branch resistances of each superconducting ribbon in a superconducting cable; obtaining a current sharing resistance according to the branch resistances of each superconducting ribbon and a preset overlap resistance; and obtaining target overlap lengths of each superconducting ribbon according to the current sharing resistance and the branch resistances of each superconducting ribbon. The preset overlap resistance represents the welding resistance of the superconducting ribbon and a welding piece, and the target overlap length represents the welding length of each superconducting ribbon and the welding piece. The superconducting ribbon and the welding piece in the superconducting cable can be overlapped based on the obtained overlap length, so that the total resistances of each superconducting ribbon are basically the same, and the currents of each superconducting ribbon in the superconducting cable are basically the same. The phenomenon that the superconducting ribbon in the superconducting cable loses superconductivity due to uneven resistance is reduced, and the operation reliability of the superconducting cable is improved.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, and in particular to a method, apparatus, superconducting cable, computer equipment, computer-readable storage medium, and computer program product for determining the overlap length of a superconducting cable. Background Technology

[0002] With the development of conductor technology, superconducting materials have emerged. Superconducting materials possess unique properties such as zero resistance, perfect diamagnetism, and rapid resistance transition at critical values, giving them broad application value. Superconducting materials set into long strips are called superconducting tapes, which are crucial materials for superconducting cables. Superconducting cables are a new type of power transmission cable made using the zero-resistance properties of superconducting tapes. They feature large transmission capacity, low line loss, small footprint, and environmental friendliness, offering significant technological advantages in high-load, high-density urban power distribution networks, long-distance, high-capacity power transmission, data centers, ship demagnetization, and electrolysis industries.

[0003] To transmit larger currents, superconducting cables typically employ multiple superconducting tapes connected in parallel. For superconducting cables used in power grids, the superconducting tapes are generally spirally wound onto a supporting frame at a specific pitch (helical pitch), thus achieving good flexibility and facilitating long-distance manufacturing, reel transportation, and on-site installation. By configuring a certain number of superconducting tapes and employing a reasonable parallel configuration, the single-phase (single-pole) current transmission of the constructed superconducting cable can reach tens of thousands of amperes.

[0004] However, limited by the current production length of superconducting tapes, long-distance superconducting cables typically consist of multiple short superconducting tapes connected by welding. The number of welded joints in each parallel superconducting tape exhibits a degree of randomness, leading to differences in resistance among the tapes. Since the current in a superconducting tape is highly sensitive to resistance, even small impedance differences can cause significant current unevenness. This uneven current distribution causes some superconducting tapes with lower impedance to reach their critical current first. With further current increases, they will be the first to lose superconductivity. After losing superconductivity, almost all the current in that tape will transfer to other tapes, triggering a chain reaction that causes the remaining tapes to lose superconductivity in succession, severely jeopardizing the service life and reliability of the superconducting cable. Currently, the problem of insufficient operational reliability caused by uneven resistance distribution in the superconducting tape branches of superconducting cables remains to be addressed. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, apparatus, superconducting cable, computer equipment, computer-readable storage medium, and computer program product for determining the lap length of superconducting cables, which can improve the operational reliability of superconducting cables, in response to the above-mentioned technical problems.

[0006] In a first aspect, this application provides a method for determining the overlap length of a superconducting cable, the method comprising:

[0007] Obtain the branch resistance of each superconducting tape in the superconducting cable;

[0008] The current-sharing resistance is obtained based on the branch resistance of each superconducting tape and the preset lap resistance, wherein the preset lap resistance characterizes the welding resistance between the superconducting tape and the weldment.

[0009] The target overlap length of each superconducting tape is obtained based on the current sharing resistance and the branch resistance of each superconducting tape; the target overlap length represents the welding length between each superconducting tape and the weldment.

[0010] In one embodiment, the preset overlap resistance is a numerical range determined by a preset overlap resistance lower limit and a preset overlap resistance upper limit, and the step of obtaining the current-sharing resistance based on the branch resistance of each superconducting tape and the preset overlap resistance includes:

[0011] The total resistance range of each superconducting tape is determined based on the branch resistance and the preset overlap resistance of each superconducting tape.

[0012] The current-equalizing resistance is obtained based on the total resistance range of each superconducting tape.

[0013] In one embodiment, obtaining the current-sharing resistance based on the total resistance range of each of the superconducting strips includes:

[0014] Determine the overlapping resistance range within the total resistance range of each of the aforementioned superconducting tapes;

[0015] The current sharing resistance is determined based on the range of overlapping resistances.

[0016] In one embodiment, determining the current-sharing resistance based on the overlapping resistance range includes:

[0017] The minimum value in the range of overlapping resistances is used as the current sharing resistance.

[0018] Secondly, this application also provides a device for determining the overlap length of a superconducting cable, the device comprising:

[0019] The resistance acquisition module is used to acquire the branch resistance of each superconducting tape in the superconducting cable;

[0020] The current sharing resistance calculation module is used to obtain the current sharing resistance based on the branch resistance of each superconducting tape and the preset lap resistance, wherein the preset lap resistance characterizes the welding resistance between the superconducting tape and the weldment.

[0021] The overlap length determination module is used to obtain the target overlap length of each superconducting tape based on the current sharing resistance and the branch resistance of each superconducting tape; the target overlap length represents the welding length between each superconducting tape and the weldment.

[0022] Thirdly, this application also provides a superconducting cable, including a superconducting tape, a skeleton, and welded components. The superconducting tape is wound around the skeleton, and the welded components are sleeved at both ends of the skeleton. The superconducting tape overlaps with the welded components based on the welding length determined by the above method.

[0023] In one embodiment, a current equalization measurement line is further included, which is disposed on the skeleton in a manner corresponding to the superconducting tape.

[0024] In one embodiment, the thickness of the current equalization measurement line is less than or equal to the thickness of the superconducting tape.

[0025] In one embodiment, the flow equalization measurement line is a flat line.

[0026] In one embodiment, each of the superconducting tapes is distributed at equal intervals with the current equalization measurement lines.

[0027] Fourthly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0028] Obtain the branch resistance of each superconducting tape in the superconducting cable;

[0029] The current-sharing resistance is obtained based on the branch resistance of each superconducting tape and the preset lap resistance, wherein the preset lap resistance characterizes the welding resistance between the superconducting tape and the weldment.

[0030] The target overlap length of each superconducting tape is obtained based on the current sharing resistance and the branch resistance of each superconducting tape; the target overlap length represents the welding length between each superconducting tape and the weldment.

[0031] Fifthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0032] Obtain the branch resistance of each superconducting tape in the superconducting cable;

[0033] The current-sharing resistance is obtained based on the branch resistance of each superconducting tape and the preset lap resistance, wherein the preset lap resistance characterizes the welding resistance between the superconducting tape and the weldment.

[0034] The target overlap length of each superconducting tape is obtained based on the current sharing resistance and the branch resistance of each superconducting tape; the target overlap length represents the welding length between each superconducting tape and the weldment.

[0035] Sixthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0036] Obtain the branch resistance of each superconducting tape in the superconducting cable;

[0037] The current-sharing resistance is obtained based on the branch resistance of each superconducting tape and the preset lap resistance, wherein the preset lap resistance characterizes the welding resistance between the superconducting tape and the weldment.

[0038] The target overlap length of each superconducting tape is obtained based on the current sharing resistance and the branch resistance of each superconducting tape; the target overlap length represents the welding length between each superconducting tape and the weldment.

[0039] The aforementioned method, apparatus, superconducting cable, computer equipment, computer-readable storage medium, and computer program product for determining the overlap length of superconducting cables can obtain the branch resistance of each superconducting tape, calculate the current-sharing resistance based on the branch resistance and a preset overlap resistance, and then calculate the overlap resistance of each superconducting tape using the current-sharing resistance and the branch resistance of each superconducting tape, thereby obtaining the overlap length matching each superconducting tape. Based on the obtained overlap length, the superconducting tapes and welded components in the superconducting cable are overlapped, ensuring that the total resistance of each superconducting tape is essentially the same, thus guaranteeing that the current in each superconducting tape in the superconducting cable is essentially the same. This reduces the occurrence of superconducting loss due to uneven resistance in the superconducting tapes, improving the operational reliability of the superconducting cable. Attached Figure Description

[0040] Figure 1 This is a diagram illustrating the application environment of a method for determining the overlap length of a superconducting cable in one embodiment.

[0041] Figure 2 This is a flowchart illustrating a method for determining the overlap length of a superconducting cable in one embodiment;

[0042] Figure 3 This is a graph showing the relationship between weld length and weld resistance in one embodiment;

[0043] Figure 4 This is a flowchart illustrating the steps of obtaining the current-sharing resistance based on the branch resistance and preset overlap resistance of each superconducting tape in one embodiment.

[0044] Figure 5 This is a flowchart illustrating the steps for obtaining the current-sharing resistance based on the total resistance range of each superconducting tape in one embodiment.

[0045] Figure 6 This is a flowchart illustrating the method for determining the overlap length of a superconducting cable in another embodiment;

[0046] Figure 7 This is a structural block diagram of a device for determining the overlap length of a superconducting cable in one embodiment;

[0047] Figure 8 This is a schematic diagram of the structure of a superconducting cable in one embodiment;

[0048] Figure 9 This is a schematic diagram of the structure of a superconducting cable in another embodiment;

[0049] Figure 10 This is a schematic diagram of the measurement of the branch resistance of a superconducting tape in one embodiment;

[0050] Figure 11 This is a schematic diagram of the overlap length of the superconducting tape in one embodiment;

[0051] Figure 12 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0053] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0054] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0055] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0057] The method for determining the overlap length of superconducting cables provided in this application embodiment can be applied to, for example... Figure 1 The application environment shown is illustrated. Terminal 102 is connected to a data storage system. Specifically, the data storage system stores relevant data for calculating the superconducting cable overlap length, such as the branch resistance of each superconducting strip, and graphs showing the relationship between welding resistance, welding length, and welding thickness. Terminal 102 acquires data from the data storage system, calculates the superconducting cable overlap length based on the acquired data, and thus determines the superconducting cable overlap length. Terminal 102 can be, but is not limited to, various personal computers, laptops, smartphones, and tablets. The data storage system can be a memory within the terminal, an independent storage element connected externally to the terminal, or a cloud storage disk located on the cloud or other network servers.

[0058] In one embodiment, such as Figure 2 As shown, a method for determining the lap length of a superconducting cable is provided, which can be applied to... Figure 1 Taking terminal 102 as an example, the explanation includes the following steps:

[0059] Step 202: Obtain the branch resistance of each superconducting tape in the superconducting cable.

[0060] Superconducting tape is a strip-shaped superconducting material. Superconductors are special conductors with zero electrical resistance in their superconducting state. Superconducting tapes are typically long strips, but can also be cylindrical. The cross-section can be rectangular, circular, parallelogram-shaped, or irregular. Superconducting tapes are uniform in thickness, with roughly equal thickness at both ends. Superconducting tapes are commonly used to manufacture superconducting cables, which are extremely efficient power transmission devices that can transmit electrical energy without loss due to their zero resistance.

[0061] A superconducting cable comprises superconducting tapes, a skeleton, and welded components. Multiple superconducting tapes are wound around the skeleton, and welded components are fitted at both ends of the skeleton. The welded components overlap with the superconducting tapes, fixing both ends of the superconducting tapes in place. The overlap is typically achieved through welding. The superconducting tapes at both ends are bundled together within a welded component by welding, and current leads are connected to the power grid via the welded components. The superconducting cable overlap length determination method of this application is used when the superconducting tapes have not yet overlapped with the welded components, i.e., before the superconducting cable is constructed, to determine the overlap lengths between each superconducting tape and the welded component using the method of this application, thereby completing the construction of the superconducting cable. Specifically, workers can use various resistance measurement methods to measure the resistance of each superconducting tape within the superconducting cable and record the branch resistance of each superconducting tape. The branch resistances of each superconducting tape are stored in a data storage system or directly input into a terminal, which then retrieves the branch resistances of each superconducting tape.

[0062] Optionally, the resistance measurement method is not limited; it can be direct measurement or measurement using a current-equalizing measuring line. The current-equalizing measuring line is a conductor, which can be a metallic conductor, such as copper wire. The current-equalizing measuring line is equal to or approximately equal in length to the superconducting tape and is set on the frame using a winding method corresponding to that of the superconducting tape.

[0063] The corresponding resistance measurement method is as follows: First, measure the resistance of the current-equalizing measurement line separately. Then, locate each superconducting tape according to the current-equalizing measurement line to facilitate the staff's identification of the two ends of the same superconducting tape. Select a superconducting tape, short-circuit one end of the designated superconducting tape to the current-equalizing measurement line, and lead out a measurement auxiliary circuit from the other end of the designated superconducting tape and the current-equalizing measurement line to measure the resistance of the designated superconducting tape. At this time, a high-precision resistance measurement method such as the "four-wire method" (also known as Kelvin four-wire detection) can be used for resistance measurement. Since the resistance of the current-equalizing measurement line is a constant and known value, the resistance value of the designated superconducting tape can be easily obtained. The short-circuiting method can be temporary welding, crimping, or using conductive clips. From the perspective of operational convenience, using conductive clips to short-circuit the current-equalizing measurement line to the designated superconducting tape is simpler and more convenient for the staff.

[0064] Step 204: Obtain the current sharing resistance based on the branch resistance of each superconducting tape and the preset overlap resistance.

[0065] The preset lap resistance characterizes the welding resistance between the superconducting tape and the weldment. During the lap joint of the superconducting tape and the weldment, resistance is inevitably generated during the welding operation; this resistance is called welding resistance. Welding resistance is related to the welding material, welding length, and welding thickness. For example, when the welding material is tin, the relationship between welding resistance and welding length at different solder thicknesses is as follows: Figure 3As shown, the welding resistance decreases with increasing weld length, but the decrease becomes less significant after the weld length exceeds 60mm. Depending on welding habits or procedures, operators can select different welding materials and determine the weld thickness, allowing them to choose different welding resistances or ranges. The selected welding resistance or range is the preset lap resistance.

[0066] Specifically, the preset overlap resistance can be a range of values ​​determined by the lower and upper limits of the preset overlap resistance; or it can be a fixed value. The preset overlap resistance can be stored in a data storage system or in the terminal. The terminal integrates and analyzes the branch resistances of each superconducting tape with the preset overlap resistance, adjusts the total resistance of each superconducting tape, and thus obtains a current-sharing resistance that makes the total resistance of each superconducting tape equal or approximately equal.

[0067] For example, the welding material can be tin, and the welding thickness can be selected as 0.04mm, then the welding resistance is corresponding to... Figure 3 The point marked by the equilateral triangle. Staff can select a preset bridging resistor on the curve marked by the equilateral triangle.

[0068] Step 206: Based on the current-equalizing resistance and the branch resistance of each superconducting tape, the target overlap length of each superconducting tape is obtained.

[0069] The target overlap length represents the welding length between each superconducting tape and the welded component.

[0070] Specifically, by subtracting the branch resistance of each superconducting tape from the current-sharing resistance, the lap resistance value of each superconducting tape can be obtained. Figure 3 It is known that, given the selected welding materials and thickness, changes in welding length correspond to changes in welding resistance. When welding superconducting tapes with the same welding material and thickness, a longer welding length results in lower welding resistance. Therefore, the target overlap length for each superconducting tape can be determined based on its individual overlap resistance value. When welding superconducting tapes to components, operators can use this target overlap length as a reference. Assuming no operational errors, this minimizes the resistance differences among the superconducting tapes in the superconducting cable, reducing the likelihood of current unevenness leading to quenching failure.

[0071] In this embodiment, the branch resistance of each superconducting tape can be obtained. Based on the branch resistance and a preset overlap resistance, a current-sharing resistance is obtained. Then, the overlap resistance of each superconducting tape is obtained from the current-sharing resistance and the branch resistance of each superconducting tape, thus yielding an overlap length matching each superconducting tape. Based on the obtained overlap length, the superconducting tapes and welded components in the superconducting cable are overlapped, ensuring that the total resistance of each superconducting tape is essentially the same, thereby guaranteeing that the current in each superconducting tape in the superconducting cable is essentially the same. This reduces the occurrence of superconducting loss due to uneven resistance in the superconducting tapes in the superconducting cable, improving the operational reliability of the superconducting cable.

[0072] In one embodiment, the preset overlap resistance is a numerical range determined by a preset lower limit value and a preset upper limit value, such as... Figure 4 As shown, step 204 includes steps 402 and 404.

[0073] Step 402: Determine the total resistance range of each superconducting tape based on the branch resistance and preset overlap resistance of each superconducting tape.

[0074] Specifically, the terminal adds the branch resistances of each superconducting tape according to a preset overlap resistance. The preset overlap resistance is added to the branch resistance of each superconducting tape. When the preset overlap resistance falls within a range determined by a lower and upper limit value, the total resistance range of each superconducting tape can be determined. For example, the lower limit of the total resistance range for one superconducting tape is the sum of its branch resistance and the lower limit of the preset overlap resistance, and the upper limit of the total resistance is the sum of its branch resistance and the upper limit of the preset overlap resistance.

[0075] Optionally, the preset overlap resistance can also be a fixed value. When the preset overlap resistance is a fixed value, the terminal determines the total resistance of each superconducting tape based on the branch resistance of each superconducting tape and the preset overlap resistance. In this case, the total resistance of each superconducting tape is the sum of its respective branch resistance and the preset overlap resistance.

[0076] For example, such as Figure 3 As shown, considering welding efficiency and ease of operation for workers, the preset lower limit of the lap resistance can be set to 10nΩ, and the preset upper limit of the lap resistance can be set to 60nΩ. Alternatively, considering the ease of operation for workers and the performance of the superconducting cable, to ensure effective current transfer and necessary mechanical strength, the minimum weld length should not be less than 8mm. Furthermore... Figure 3 It is known that the welding length has no significant effect on the welding resistance after it exceeds 50mm, and the welding length cannot be too long in order to reduce the weight and volume of the welded parts. Therefore, a preset lower limit for the welding length can be set to 8mm, and a preset upper limit for the welding length can be set to 50mm. The preset welding length is then determined based on... Figure 3The relationship diagram shown is converted into the corresponding preset welding resistance, that is, the preset lap resistance lower limit is 10nΩ and the preset lap resistance upper limit is 60nΩ.

[0077] Step 404: Based on the total resistance range of each superconducting tape, obtain the current-equalizing resistance.

[0078] Specifically, the preset overlap resistance is a numerical range determined by the preset lower limit and the preset upper limit of the overlap resistance. After the terminal obtains the total resistance range of each superconducting tape based on the branch resistance of each superconducting tape and the preset overlap resistance, it summarizes the total resistance range of each superconducting tape and uses an optimization algorithm to find a resistance value within this total resistance range summary data set that makes the total resistance of each superconducting tape equal or approximately equal. This resistance value is the current sharing resistance.

[0079] For example, an optimization algorithm could be a genetic algorithm. A genetic algorithm is a search algorithm in computational mathematics used to solve optimization problems; it is a type of evolutionary algorithm. Genetic algorithms can seek the optimal solution through computation, and they are fast and efficient.

[0080] Optionally, the preset overlap resistance can also be a fixed value. After the terminal obtains the total resistance of each superconducting tape based on the branch resistance of each superconducting tape and the preset overlap resistance, it summarizes the total resistance of each superconducting tape and uses algorithms or logical judgments to find the minimum total resistance of the superconducting tape. This resistance value is the current sharing resistance.

[0081] In this embodiment, the total resistance range of each superconducting tape is calculated based on the branch resistance and preset overlap resistance of each superconducting tape to obtain the current-sharing resistance. By calculating the resistance of each superconducting tape in the superconducting cable, it is ensured that each superconducting tape can be adjusted to the current-sharing resistance, reducing the risk of quenching failure caused by large differences between superconducting tapes, and effectively achieving the current-sharing effect of the superconducting cable.

[0082] In one embodiment, such as Figure 5 As shown, step 404 includes steps 502 and 504.

[0083] Step 502: Determine the overlapping resistance range within the total resistance range of each superconducting tape.

[0084] Specifically, when the terminal calculates the total resistance range of each superconducting tape, it compares the total resistance ranges of each superconducting tape and calculates the overlapping resistance range that is common to all the total resistance ranges of the superconducting tapes. The overlapping resistance range is a subset of the total resistance range of each superconducting tape, meaning that the total resistance range of each superconducting tape must include this overlapping resistance range.

[0085] Furthermore, this method is applicable, but not limited to, overlapping of superconducting tapes and welded components where the resistance difference is within a controllable range. Generally, the resistance of superconducting tapes produced in the same factory or at the same production level is within a controllable range, typically below 50 nΩ. When the branch resistance differences of each superconducting tape are small, the overlapping resistance range can be calculated. When the total resistance range of each superconducting tape differs too much, and there is no overlapping resistance range within the total resistance range, the terminal can use optimization algorithms to find an optimal solution. This optimal solution will ensure that the total resistance difference of each superconducting tape is minimized, so as to achieve the best possible current sharing effect.

[0086] Optionally, when the preset overlap resistance is a fixed value, the terminal determines the minimum total resistance among the total resistances of each superconducting tape.

[0087] Step 504: Determine the current sharing resistor based on the overlapping resistance range.

[0088] Specifically, after obtaining the overlapping resistance range, the terminal selects a current-sharing resistor from within that range. The selection method is not limited; it can be the median, the maximum, or the minimum value. Any selected resistance value that is included within the overlapping resistance range can be designated as the current-sharing resistor.

[0089] Optionally, when the preset overlap resistance is a fixed value, the minimum total resistance among the total resistances of each superconducting tape is determined as the current sharing resistance.

[0090] In this embodiment, the current-sharing resistance is determined by processing the total resistance range of each superconducting strip. Selecting a current-sharing resistance within the overlapping resistance range ensures that the total resistance value of each superconducting strip can be achieved by adjusting the welding resistance. This guarantees that the total resistance of each superconducting strip in the superconducting cable is equal or approximately equal, achieving a current-sharing effect and improving the stability of the superconducting cable.

[0091] In one embodiment, such as Figure 6 As shown, step 504 also includes step 602.

[0092] Step 602: Use the minimum value in the overlapping resistance range as the current sharing resistance.

[0093] Specifically, the minimum value within the overlapping resistance range is taken as the current-sharing resistance. Correspondingly, when the branch resistance of the superconducting tape is constant, the welding resistance is also minimized. By minimizing the welding resistance, the total resistance of the superconducting tape can be reduced as much as possible, thereby improving the current carrying capacity of the superconducting tape and thus improving the load capacity of the superconducting cable.

[0094] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0095] Based on the same inventive concept, this application also provides a superconducting cable overlap length determination device for implementing the superconducting cable overlap length determination method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more embodiments of the superconducting cable overlap length determination device provided below can be found in the limitations of the superconducting cable overlap length determination method described above, and will not be repeated here.

[0096] In one embodiment, such as Figure 7 As shown, a device for determining the overlap length of a superconducting cable is provided, comprising: a resistance acquisition module 702, a current sharing resistance calculation module 704, and an overlap length determination module 706, wherein:

[0097] The resistance acquisition module 702 is used to acquire the branch resistance of each superconducting tape in the superconducting cable.

[0098] The current sharing resistance calculation module 704 is used to obtain the current sharing resistance based on the branch resistance of each superconducting tape and the preset lap resistance; the preset lap resistance characterizes the welding resistance between the superconducting tape and the welded part.

[0099] The overlap length determination module 706 is used to obtain the target overlap length of each superconducting strip based on the current sharing resistance and the branch resistance of each superconducting strip; the target overlap length characterizes the welding length between each superconducting strip and the weldment.

[0100] In one embodiment, the preset overlap resistance is a numerical range determined by a preset lower limit value and a preset upper limit value. The current-sharing resistance calculation module 704 is further configured to determine the total resistance range of each superconducting tape based on the branch resistance of each superconducting tape and the preset overlap resistance. The current-sharing resistance is obtained based on the total resistance range of each superconducting tape.

[0101] In one embodiment, the current sharing resistance calculation module 704 is further used to determine the overlapping resistance range in the total resistance range of each superconducting tape, and to determine the current sharing resistance based on the overlapping resistance range.

[0102] In one embodiment, the current sharing resistance calculation module 704 is further configured to use the minimum value in the overlapping resistance range as the current sharing resistance.

[0103] Each module in the aforementioned superconducting cable splice length determination device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the corresponding operations of each module.

[0104] In one embodiment, such as Figure 8 As shown in the embodiment of this application, a superconducting cable is also provided, including a superconducting tape 1, a skeleton 2, and a welded component 3. The superconducting tape 1 is wound around the skeleton 2, and the welded component 3 is sleeved on both ends of the skeleton 2. The superconducting tape 1 overlaps with the welded component 3 based on the welding length determined by the superconducting cable overlap length determination method in the above embodiment.

[0105] Superconducting tape 1 is a strip-shaped superconducting material. Superconducting materials are special conductors with zero resistance when in the superconducting state. Superconducting tape 1 is typically a long strip, but can also be cylindrical. The cross-section can be rectangular, circular, parallelogram-shaped, or irregular. Superconducting tape 1 has a uniform thickness, with equal thickness at both ends. Superconducting tape 1 is commonly used to manufacture superconducting cables, which are extremely efficient power transmission devices that can transmit electrical energy without loss due to their zero resistance.

[0106] Specifically, the superconducting cable includes superconducting tape 1, a frame 2, and welded components 3. Multiple superconducting tapes 1 are wound around the frame 2, and the welded components 3 are fitted onto both ends of the frame 2, overlapping with the superconducting tapes 1 to fix both ends of the superconducting tapes 1. The superconducting tapes 1 are bundled together at both ends within a welded component 3 by welding, and current leads are connected to the power grid via the welded component 3. The superconducting cable overlap length determination method of this application is used when the superconducting tapes 1 have not yet overlapped with each other, that is, when the superconducting cable has not yet been constructed, to determine the overlap length between each superconducting tape and the welded component using the method of this application. The workers then overlap each superconducting tape 1 with the welded component 3 to complete the construction of the superconducting cable.

[0107] Furthermore, staff can use various resistance measurement methods to measure the resistance of each superconducting strip 1 within the superconducting cable and record the branch resistance of each superconducting strip 1. The terminal then determines the target overlap length through a preset overlap resistance. Staff then perform welding according to this target overlap length.

[0108] For example, the skeleton 2 is a support wound around the superconducting tape 1, and can be a cylindrical symmetrical structure. Depending on the configuration or structure of the superconducting cable, it can also be a supporting corrugated tube, or the outer insulating wall of other phase (AC) / pole (DC) cables.

[0109] In one embodiment, such as Figure 9 As shown, the superconducting cable also includes a current equalization measurement line 4, which is arranged on the skeleton 2 in a manner corresponding to the superconducting tape 1.

[0110] Specifically, the number of superconducting tapes 1 in a superconducting cable is variable, and it is difficult to distinguish the two ends of the same superconducting tape 1 after it is wound. Therefore, a current equalization measuring line 4 is set in the superconducting cable. The current equalization measuring line 4 and the superconducting tape 1 are wound on the frame 2 in the same direction and with the same winding pitch (helical pitch). The position of each superconducting tape 1 can be used to locate it, which makes it easier for the staff to identify the two ends of the same superconducting tape 1.

[0111] Furthermore, the current-equalizing measurement line 4 can also be used to measure the branch resistance of the superconducting tape 1. First, the resistance of the current-equalizing measurement line 4 is measured separately. Then, a superconducting tape 1 is selected based on the position of the current-equalizing measurement line 4, and the two ends of the superconducting tape 1 are accurately located. Subsequent operations are as follows... Figure 10 As shown, one end of the designated superconducting tape 1 is short-circuited to the current equalization measurement line 4 (see...). Figure 10 The left end of the current equalization measurement line 4 is short-circuited to the superconducting tape 1, and the other end leads out a measurement auxiliary line on the designated superconducting tape 1 and the current equalization measurement line 4 (see...). Figure 10 (A measurement auxiliary circuit is led out from the right end) to measure the resistance of the specified superconducting tape 1. High-precision resistance measurement methods such as the "four-lead method" can be used at this time. Since the resistance of the current-equalizing measurement line 4 is a constant and known value, the resistance value of the specified superconducting tape 1 can be easily obtained.

[0112] Optionally, the short-circuiting method can be temporary welding, crimping, or using a conductive clamp. From the perspective of operational convenience, using a conductive clamp to short-circuit the current equalization measurement line 4 to the designated superconducting strip 1 is simpler and more convenient for the operator.

[0113] For example, the current equalization measurement line 4 is a conductor, such as enameled copper wire, copper wire with a polytetrafluoroethylene sheath, etc.

[0114] In this embodiment, a current equalization measurement line 4 is provided in the superconducting cable to facilitate positioning when measuring the resistance of the superconducting tape 1 inside the superconducting cable, and to facilitate measuring the branch resistance of the superconducting tape 1.

[0115] In one embodiment, the thickness of the current equalization measurement line 4 is less than or equal to the thickness of the superconducting tape 1.

[0116] Specifically, for ease of and uniform installation of superconducting cables, the thickness of the current equalization measuring line 4 should be less than or equal to the thickness of the superconducting tape 1. Optionally, the current equalization measuring line 4 can be a round line or a flat line. If the current equalization measuring line 4 is a round line, its diameter cannot exceed the thickness of the superconducting tape 1; if a flat cable or copper tape is used, its thickness should be consistent with that of the superconducting tape.

[0117] Furthermore, the width of the current equalization measurement line 4 should not be greater than half of the superconducting band, and its elasticity should be basically consistent with that of the superconducting band, with a deviation of no more than ±10%.

[0118] In one embodiment, the current equalization measurement line 4 is a flat wire. Using a flat wire and setting it accordingly with the superconducting tape 1 can improve compatibility with the superconducting tape 1, reduce the likelihood of deviation, and facilitate positioning.

[0119] In one embodiment, each superconducting tape 1 and the current equalization measurement line 4 are distributed at equal intervals.

[0120] Specifically, in the superconducting cable, the superconducting tape 1 is wound on the frame 2 with a certain helical pitch (or equivalent helical angle). Correspondingly, the current equalization measurement line 4 is also wound on the frame 2 with the same helical pitch (or equivalent helical angle) as the superconducting tape 1. A small and symmetrically distributed gap is left between each superconducting tape 1, and a corresponding gap is also left between the current equalization measurement line 4 and the surrounding area.

[0121] Optionally, the gap between superconducting tapes 1 or between superconducting tapes 1 and the current equalization measurement line 4 is generally not more than 2 mm and not less than 0.5 mm, and can be selected as 1 mm.

[0122] In this embodiment, by distributing the superconducting tape 1 and the current equalization measurement line 4 at equal intervals, the uniformity and symmetry of the magnetic field of the superconducting cable when it is energized can be ensured, thereby optimizing the stability of the superconducting cable.

[0123] To better understand the above method for determining the lap length of superconducting cables, combined with Figure 1 The application scenarios shown and Figure 9 The superconducting cable shown below will be explained in detail with reference to a specific embodiment.

[0124] In one embodiment, the structure of the superconducting cable is as follows: Figure 9As shown, the system includes a superconducting tape 1, a framework 2, a welded component 3, and a current equalization measurement line 4. The framework 2 has a cylindrical symmetrical structure, and the superconducting tape 1 is also a slender cylindrical structure. Each superconducting tape 1 is wound around the framework 2 with a 1mm gap. The current equalization measurement line 4 is a flat wire, specifically a flat copper strip, with a thickness equal to the diameter of the superconducting tape 1. The current equalization measurement line 4 is also wound around the framework 2 with the same 1mm gap as the superconducting tape 1. The welded component 3 is a copper head with a special process, used to overlap the superconducting tape 1 and connect the current leads to the power grid.

[0125] The staff needs to overlap the superconducting tape 1 with the copper head, and the overlap length needs to be determined.

[0126] First, the branch resistance of superconducting tape 1 is measured, such as... Figure 10 As shown, a superconducting tape 1 is selected, and one end of the designated superconducting tape 1 is short-circuited to the current equalization measurement line 4. The other end is led out to form a measurement auxiliary circuit on the designated superconducting tape 1 and the current equalization measurement line 4. The branch resistance of the superconducting tape 1 is measured using the "four-lead method".

[0127] The branch resistance data of superconducting tape 1 and the preset overlap resistance are input into terminal 102. The operator then selects the welding material and welding thickness, and the computer performs calculations. Terminal 102 is the computer; the preset overlap resistance is within the range of 60nΩ to 10nΩ; the welding material is tin; and the welding thickness is 0.04mm. The computer calculates the total resistance range of each superconducting tape 1, then determines the overlapping resistance range within the total resistance range of each superconducting tape 1, and uses the minimum value within the overlapping range as the current-sharing resistance. The computer obtains the welding resistance of each superconducting tape 1 based on the current-sharing resistance. The computer also stores data such as... Figure 3 The relationship between welding resistance and welding length shown can be used to determine the welding length of each superconducting strip 1, i.e., the target lap length, based on the lap resistance of each superconducting strip 1. Figure 11 As shown, workers perform welding operations on each superconducting strip according to the target overlap length output by the computer, completing the welding setup for the superconducting cable.

[0128] In this embodiment, under a certain solder thickness, the resistance of the superconducting tape 1 can be controlled by adjusting the overlap length between the end of the superconducting tape 1 and the copper head. When the resistance of each superconducting tape 1 in the superconducting cable is compensated to the same or approximately the same value by different overlap resistances, the uneven current distribution caused by the uneven resistance of each superconducting tape 1 can be reduced, thereby reducing the occurrence of superconducting tape 1 losing its superconductivity due to uneven current distribution. Furthermore, the superconducting cable with superconducting tape 1 having uniform resistance has higher stability and load-bearing capacity because it reduces the transient instability caused by uneven current.

[0129] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 12 As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a method for determining the overlap length of a superconducting cable. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0130] Those skilled in the art will understand that Figure 12 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0131] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0132] Obtain the branch resistance of each superconducting tape in the superconducting cable;

[0133] The current-sharing resistance is obtained based on the branch resistance and the preset lap resistance of each superconducting tape. The preset lap resistance characterizes the welding resistance between the superconducting tape and the welded part.

[0134] The target overlap length of each superconducting tape is obtained based on the current sharing resistance and the branch resistance of each superconducting tape; the target overlap length characterizes the welding length between each superconducting tape and the weldment.

[0135] In one embodiment, the preset overlap resistance is a range of values ​​determined by a preset lower limit value and a preset upper limit value. When the processor executes the computer program, it also performs the following steps: determining the total resistance range of each superconducting tape based on the branch resistance of each superconducting tape and the preset overlap resistance; and obtaining the current-sharing resistance based on the total resistance range of each superconducting tape.

[0136] In one embodiment, when the processor executes the computer program, it also performs the following steps: determining the overlapping resistance range in the total resistance range of each superconducting tape; and determining the current sharing resistance based on the overlapping resistance range.

[0137] In one embodiment, when the processor executes the computer program, it also performs the following step: using the minimum value in the overlapping resistance range as the current sharing resistance.

[0138] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0139] Obtain the branch resistance of each superconducting tape in the superconducting cable;

[0140] The current-sharing resistance is obtained based on the branch resistance and the preset lap resistance of each superconducting tape. The preset lap resistance characterizes the welding resistance between the superconducting tape and the welded part.

[0141] The target overlap length of each superconducting tape is obtained based on the current sharing resistance and the branch resistance of each superconducting tape; the target overlap length characterizes the welding length between each superconducting tape and the weldment.

[0142] In one embodiment, the preset overlap resistance is a range of values ​​determined by a preset lower limit value and a preset upper limit value. When the computer program is executed by the processor, it further performs the following steps: determining the total resistance range of each superconducting tape based on the branch resistance of each superconducting tape and the preset overlap resistance; and obtaining the current-sharing resistance based on the total resistance range of each superconducting tape.

[0143] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: determining the overlapping resistance range in the total resistance range of each superconducting tape; and determining the current sharing resistance based on the overlapping resistance range.

[0144] In one embodiment, when the computer program is executed by the processor, it further performs the following step: using the minimum value in the overlapping resistance range as the current sharing resistance.

[0145] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0146] Obtain the branch resistance of each superconducting tape in the superconducting cable;

[0147] The current-sharing resistance is obtained based on the branch resistance and the preset lap resistance of each superconducting tape. The preset lap resistance characterizes the welding resistance between the superconducting tape and the welded part.

[0148] The target overlap length of each superconducting tape is obtained based on the current sharing resistance and the branch resistance of each superconducting tape; the target overlap length characterizes the welding length between each superconducting tape and the weldment.

[0149] In one embodiment, the preset overlap resistance is a range of values ​​determined by a preset lower limit value and a preset upper limit value. When the computer program is executed by the processor, it further performs the following steps: determining the total resistance range of each superconducting tape based on the branch resistance of each superconducting tape and the preset overlap resistance; and obtaining the current-sharing resistance based on the total resistance range of each superconducting tape.

[0150] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: determining the overlapping resistance range in the total resistance range of each superconducting tape; and determining the current sharing resistance based on the overlapping resistance range.

[0151] In one embodiment, when the computer program is executed by the processor, it further performs the following step: using the minimum value in the overlapping resistance range as the current sharing resistance.

[0152] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0153] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0154] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method of determining the overlap length of a superconducting cable, characterized in that, The method comprises: obtaining branch resistances of each superconducting tape in a superconducting cable; determining total resistance ranges of each superconducting tape according to the branch resistances of each superconducting tape and a preset overlap resistance; summarizing the total resistance ranges of each superconducting tape, and finding a resistance value that makes the total resistances of each superconducting tape equal or approximately equal as a current-sharing resistance in a data set of the summarized total resistance ranges; the preset overlap resistance is a numerical range determined by a preset overlap resistance lower limit value and a preset overlap resistance upper limit value, and represents a welding resistance of the superconducting tape and a welding member; subtracting the current-sharing resistance from the branch resistance of each superconducting tape respectively to obtain an overlap resistance value that each superconducting tape has respectively; obtaining target overlap lengths of each superconducting tape according to the overlap resistance value that each superconducting tape has respectively; the target overlap lengths represent welding lengths of each superconducting tape and the welding member.

2. The method of claim 1, wherein, The summarizing the total resistance ranges of each superconducting tape, and finding a resistance value that makes the total resistances of each superconducting tape equal or approximately equal as a current-sharing resistance in a data set of the summarized total resistance ranges, comprises: determining an overlapping resistance range in the total resistance ranges of each superconducting tape; determining a current-sharing resistance according to the overlapping resistance range.

3. The method of claim 2, wherein, The determining a current-sharing resistance according to the overlapping resistance range, comprises: taking a minimum value in the overlapping resistance range as the current-sharing resistance.

4. An apparatus for determining the overlap length of a superconducting cable, characterized in that The device comprises: a resistance obtaining module configured to obtain branch resistances of each superconducting tape in a superconducting cable; a current-sharing resistance operation module configured to determine total resistance ranges of each superconducting tape according to the branch resistances of each superconducting tape and a preset overlap resistance; summarize the total resistance ranges of each superconducting tape, and find a resistance value that makes the total resistances of each superconducting tape equal or approximately equal as a current-sharing resistance in a data set of the summarized total resistance ranges; the preset overlap resistance is a numerical range determined by a preset overlap resistance lower limit value and a preset overlap resistance upper limit value, and represents a welding resistance of the superconducting tape and a welding member; an overlap length determining module configured to subtract the current-sharing resistance from the branch resistance of each superconducting tape respectively to obtain an overlap resistance value that each superconducting tape has respectively; and obtain target overlap lengths of each superconducting tape according to the overlap resistance value that each superconducting tape has respectively; the target overlap lengths represent welding lengths of each superconducting tape and the welding member.

5. A superconducting cable, characterized by The superconducting cable comprises superconducting tapes, a framework, and a welding member; the superconducting tapes are wound on the framework; the welding member is sleeved on both ends of the framework; and the welding lengths of the superconducting tapes and the welding member are determined based on the method according to any one of claims 1-3.

6. The superconducting cable of claim 5, wherein, The current-sharing measurement line is arranged on the framework in a manner corresponding to the superconducting tapes.

7. The superconducting cable of claim 6, wherein, The thickness of the current-sharing measurement line is less than or equal to the thickness of the superconducting tapes.

8. The superconducting cable of claim 6, wherein, The width of the current-sharing measurement line is less than or equal to one half of the width of the superconducting tapes.

9. The superconducting cable of claim 7, wherein, The current-sharing measurement line is a flat wire.

10. The superconducting cable of claim 7, wherein, The superconducting tapes and the current-sharing measurement line are distributed at equal intervals.

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