Cold-insulating DC high-temperature superconducting current limiting cable

Abstract

The invention discloses a cold-insulating DC high-temperature superconducting current limiting cable, which comprises a cooling channel, a wire stranding frame, a semiconductor conductor layer I, a superconducting layer, a semiconductor conductor layer II, an insulating layer, a shielding layer and a protective layer. The cooling channel is arranged in the wire stranding frame. The wire strandingframe is wrapped with the semiconductor conductor layer I. The superconducting layer is wound outside the semiconductor conductor layer I. The superconducting layer is wrapped with the semiconductor conductor layer II. The semiconductor conductor layer II is wrapped with the insulating layer. The shielding layer is wound outside the insulating layer. The shielding layer is wrapped with the protective layer. A cooling medium is circulated in the cooling channel. The wire stranding frame is connected in parallel with the superconducting layer. The cable of the invention has double functions of transmission and current limitation. The cable does not need to be connected to a superconducting current limiter, and the device cost and the operation and maintenance costs are reduced. The wire stranding frame is made of a high-resistivity metal material, which can better inhibit the fault current when the cable fails. The structure of the wire stranding frame can improve the mechanical strengthand flexibility of the cable.

Description

technical field [0001] The invention relates to the field of superconducting engineering technology, in particular to a cold-insulated DC high-temperature superconducting current-limiting cable. Background technique [0002] With the development of high-temperature superconducting technology, the operating temperature of superconductors has been raised to the liquid nitrogen temperature region (77K). High-temperature superconducting cable is one of the important applications of high-temperature superconducting technology in power systems. It can realize large-capacity and low-loss power transmission. High-temperature superconducting cables are developing rapidly in the direction of practicality and industrialization. [0003] When a line short-circuit fault occurs, the short-circuit current becomes very large, even exceeding the breaking capacity of the circuit breaker, causing damage to the DC power system. However, unlike AC, DC current does not exceed zero, and current l...

AI Technical Summary

Problems solved by technology

However, the method of connecting superconducting current limiters in series will increase the cost of line devices and operation and maintenance costs

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