Low-voltage coil for superconducting transformer and superconducting transformer

Abstract

The invention provides a low-voltage coil for a superconducting transformer. The low-voltage coil is formed by winding a superconducting strand with isotropic characteristics, the section of the superconducting strand is of a square structure, the superconducting strand is composed of a superconducting strand core with a square section and a metal wrapping layer, and the superconducting strand core is formed by stacking a plurality of superconducting tapes in a certain direction. According to the superconducting transformer adopting the isotropic superconducting strand to wind the low-voltagecoil, the situation that the current-carrying capacities of different positions of the superconducting coil are greatly different due to anisotropism of the current-carrying capacities of the superconducting strips under the action of an external magnetic field at present can be effectively improved, the current-carrying capacity of the superconducting tape is fully utilized, the critical currentof the superconducting coil is improved, the circulating current of a parallel circuit is reduced, and the economy, safety and stability of the superconducting transformer coil are improved.

Description

technical field [0001] The invention relates to the application field of superconducting electric power, and more specifically, relates to a low-voltage coil of a superconducting transformer. Background technique [0002] Compared with traditional conventional transformers, superconducting transformers use superconducting strips to wind the windings. Superconducting strips have high current-carrying density and low resistance. Therefore, superconducting transformers have the advantages of small size, light weight, good environmental performance, and high safety. . [0003] However, practical high-temperature superconducting materials have strong anisotropy, and at a temperature of 77K, the critical current I c The empirical model of (B, θ) changing with the magnitude and direction of the magnetic field is: [0004] [0005] In the formula, where, B / / and B ⊥ are the magnetic induction intensity of the magnetic field component parallel and perpendicular to the surface...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the anisotropy of the current-carrying capacity of the high-temperature superconducting strip of the superconducting transformer in the prior art under a magnetic field, the current-carrying capacity of the two ends is seriously reduced, thereby limiting the current-carrying capacity of the entire winding , and may further cause the technical problem of coil quenching, the present invention provides a low-voltage coil for superconducting transformers, the low-voltage coil is wound with superconducting strands with isotropic properties, and the superconducting strands It includes a wire core and a metal outer cladding, the metal outer cladding is rolled and wrapped on the wire core, and the wire core is formed by stacking several superconducting strips

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