Design method of high-temperature superconducting cable/busbar main body

Abstract

The invention relates to a design method of a superconducting cable / bus body, belonging to the field of power system transmission and transformation. The method comprises the steps of: creating an equivalent circuit model of the superconducting cable / bus; determining the winding helix angle of the superconducting cable / bus body, according to the mechanical property of a superconducting tape; determining the magnetic field type (magnetic filed size and direction) distribution on each layer of the superconducting cable / bus body by the anisotropy of the superconducting tape critical current, according to the running current; iterative computing the winding screw pitch to get the winding screw pitch parameters, based on the principle of equation of the running current and the critical current in each layer. The method makes use of the mechanical and electromagnetic property of the superconducting tape, the designed superconducting cable / bus body has no increased winding difficulty, the superconducting cable / bus tape has improved utility efficiency, and the loss is low. The method also has the advantages of simplicity and practicality.

Description

technical field [0001] The invention relates to a design method of a superconducting cable / bus bar body, which belongs to the field of power transmission and transformation of power systems. Background technique [0002] In recent years, the preparation technology of high-temperature superconducting materials has made great progress, which has greatly accelerated the development of high-temperature superconducting power technology. Due to the use of high-temperature superconducting materials with high unimpeded transmission current density as conductors and liquid nitrogen as cooling medium, high-temperature superconducting cables / busbars will have the advantages of small size, light weight, low loss, and no fire hazard; therefore, high temperature Superconducting cables / busbars are used in high-current, medium- and low-voltage power transmission, such as from generators to step-up transformers and urban substations to users. The current is generally between 10kA and 26kA. T...

AI Technical Summary

Problems solved by technology

In this way, the outermost wire of the superconducting cable / busbar is in the strongest magnetic field, and the critical current attenuation is the largest; although the previous design is for superconducting cables / busbars with fewer layers (less than 4 layers) and low current (less than 10kA) Effective, but not optimal for superconducting cable / busbar designs with many layers and high currents

Because this design makes the engineering current density of each superconducting strip equal in principle, but the critical current of superconducting strips on each layer is different, the critical current of the outermost layer is the smallest, and the critical current of the innermost layer is the largest; thus, the transmission current and the critical current are different. The ratio of the current decreases sequentially from the inner layer to the outer layer, resulting in an increase in transmission AC loss

This approach is not optimal for high current superconducting cable / busbar designs

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