Cryogenic-liquid forced cooling cable structure

Abstract

The embodiment of the invention discloses a cryogenic-liquid forced cooling cable structure, and the structure comprises a conductor (1), a plurality of supports (2) and a thermal insulation tube (3),wherein the conductor (1), the plurality of supports (2) and the thermal insulation tube (3) are sequentially from the inside to the outside. The conductor (1) is a hollow metal tube, and a side wallof the metal tube is provided with through holes (12) at intervals. The interior of the conductor forms a cryogenic-liquid channel (11), and the supports (2) are each of a hollow-out structure formedby the processing of a non-metal material, and sleeve the conductor (1) at certain intervals. The thermal insulation tube (3) is a high-vacuum thermal insulation tube, and the conductor (1) is disposed in the thermal insulation tube (3) in a coaxially sleeved manner through the supports (2). According to the embodiment of the invention, the structure can improve the thermal conduction efficiencyand avoid the skin effect during the transmission of a large current.

Description

technical field [0001] The invention relates to the field of superconducting transmission, in particular to a low-temperature liquid forced cooling cable structure. Background technique [0002] The resistance of high-purity aluminum or copper will be greatly reduced at low temperature, so it has important applications in occasions such as high current-carrying density and pulse power discharge. In general, low-temperature cables use liquid nitrogen to directly cool the conductors, but the direct cooling of low-temperature liquids has the following problems: First, the heating of conventional conductors causes the low-temperature liquid to vaporize, and the formed gas film is easy to adhere to the surface of the conductor, thus affecting the connection between the conductor and the low-temperature liquid. Second, the conductor has a skin effect when transmitting a large current. Most of the current passes through the conductor near the surface of the conductor, and the middl...

AI Technical Summary

Problems solved by technology

In general, low-temperature cables use liquid nitrogen to directly cool the conductors, but the direct cooling of low-temperature liquids has the following problems: First, the heating of conventional conductors causes the low-temperature liquid to vaporize, and the formed gas film is easy to adhere to the surface of the conductor, thus affecting the connection between the conductor and the low-temperature liquid. Second, the conductor has a skin effect when transmitting a large current, most of the current passes through the conductor near the surface of the conductor, and the middle part of the conductor transmits a small current, which leads to the underutilization of the current-carrying capacity of the conductor

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