Design method for coaxial bidirectional transmission direct-current high-temperature superconducting cable body

A two-way transmission, high temperature superconducting technology, applied in the field of power transmission and transformation of power systems, can solve the problems of low application efficiency and not the best method of superconducting tape

Inactive Publication Date: 2009-04-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this design is effective for superconducting cables with fewer layers (less than 4 layers) and low current (less than 10kA), it is designed for superconducting cables with more layers, operating in the liquid nitrogen temperature zone, and currents greater than 10kA. No report
Because this design makes the engineering current density of each superconducting strip equal in principle, but the critical current of the superconducting strips on each layer

Method used

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  • Design method for coaxial bidirectional transmission direct-current high-temperature superconducting cable body
  • Design method for coaxial bidirectional transmission direct-current high-temperature superconducting cable body
  • Design method for coaxial bidirectional transmission direct-current high-temperature superconducting cable body

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Embodiment 1

[0079] figure 2 It is a schematic diagram of an embodiment of a coaxial bidirectional current transmission superconducting cable body wound by eight layers of superconducting tapes. exist figure 2 Among them, 201 represents the first layer of superconducting tape, 202 represents the second layer of superconducting tape, 203 represents the third layer of superconducting tape, 204 represents the fourth layer of superconducting tape, and 205 represents the fifth layer of superconducting tape 206 is the sixth-layer superconducting tape, 207 is the seventh-layer superconducting tape, and 208 is the eighth-layer superconducting tape. Among them, the currents of layers 201, 203, 205 and 207 are in the same direction, which is the current removal; the currents of the layers 202, 204, 206 and 208 are in the same direction, which is the return current, and the interlayer insulation layer meets the insulation requirements. The winding helix angle θ in the figure refers to the angle b...

Embodiment 2

[0085] Figure 5 It is a schematic diagram of another embodiment of a coaxial bidirectional current transmission superconducting cable body wound with eight-layer superconducting tapes. exist Figure 5 Among them, 301 represents the first layer of superconducting tape, 302 represents the second layer of superconducting tape, 303 represents the third layer of superconducting tape, 304 represents the fourth layer of superconducting tape, and 305 represents the fifth layer of superconducting tape 306 is the sixth-layer superconducting tape, 307 is the seventh-layer superconducting tape, and 308 is the eighth-layer superconducting tape. The winding helix angle θ in the figure refers to the angle between the winding direction of the superconducting tape and the cable axis. Under the condition of a circular cross-section cable structure, the magnetic field is along the circumferential direction, that is, the magnetic field is parallel to the surface of the superconducting tape. Am...

Embodiment 3

[0093] Design example of coaxial bidirectional transmission DC high temperature superconducting cable,

[0094] Design requirements: rated current is 20kA, operating margin is 80%,

[0095] The design steps are:

[0096] Step 1. Design considerations:

[0097] ① Limit the strain suffered by the high-temperature superconducting tape due to thermal shrinkage and bending of the superconducting tape;

[0098] ②The magnetic field acting on the single strip should be minimized in order to reduce the I c degree of degradation;

[0099] ③Coaxial bidirectional transmission DC superconducting cable layers are subjected to the smallest magnetic field, and the critical current degradation is the smallest, which improves the utilization rate of high-temperature superconducting strips.

[0100] Step 2. Selection of layers of coaxial bidirectional transmission DC high temperature superconducting cable:

[0101] ① Electromagnetic properties of high-temperature superconducting strip: Sele...

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Abstract

The invention relates to a design method used for transmitting DC high-temperature superconducting cable body coaxially and bidirectionally, belonging to the field of power system transmission and transformation; the design method comprises the steps as follows: according to the mechanical characteristic and the radius of enwinding framework of the superconducting strips, parameters of the superconducting cable body such as the enwinding helix angle and the enwinding pitch are determined; the magnetic field distribution of all layers of superconducting cable body are determined according to the operation current, thus determining the critical current on all layers of the cable; according to the critical current and the operation redundancy, iterative calculation is carried out for operation current and the magnetic field, thus finally gaining the critical current, best operation current, enwinding layer number and number of the cables. The designed superconducting cable body increases no enwinding process difficulty and achieves bidirectional transmission of DC current; the utilization ratio of the superconducting strip critical current reaches more than 90%; the quantity and low-temperature heat loss of the superconducting cable low-temperature container are respectively reduced by half. The design method has the advantages of large transmission capability, no loss, compact structure, certain current limiting capability, stable mechanical structure, self-shielding, no electromagnetic interference and the like.

Description

technical field [0001] The invention belongs to the field of power transmission and transformation of power systems, and relates to a design method of a coaxial bidirectional transmission DC high-temperature superconducting cable body. Background technique [0002] Since the discovery of high-temperature superconductivity in the liquid nitrogen temperature region, the application of high-temperature superconducting materials in power systems has potential applications due to their zero-resistance characteristics under DC transmission conditions. Bi-based high-temperature superconducting materials have an unimpeded current transmission capability at liquid nitrogen temperature that is more than two orders of magnitude higher than that of ordinary copper conductors. Compared with traditional cables, high-temperature superconducting transmission cables have the advantages of small size, light weight, low loss, and no fire hazard. Therefore, high-temperature superconducting cab...

Claims

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Application Information

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IPC IPC(8): H01B12/02
CPCY02E40/641Y02E40/60
Inventor 王银顺崔翔李成榕
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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