A high-voltage and high-current electrode lead wire applied under the condition of large temperature gradient

Abstract

A high-voltage heavy-current electrode lead applied to a large temperature gradient condition comprises a single leading-in lead and a single leading-out lead. The single leading-in lead comprises a normal-temperature inlet wire segment, a vacuum heat insulation segment and a superconductive connection segment arranged successively; the normal-temperature inlet wire segment comprises an inlet wire terminal, a large-diameter lead, a solid insulating layer and an insulating bushing; the vacuum heat insulation segment comprises a vacuum cavity, a variable cross section lead, a solid insulating layer and a tetrafluoroethene insulating cushion block; the superconductive connection segment comprises a Dewar bottle, liquid nitrogen, a small-diameter lead, a solid insulating layer, a connection terminal and a super conductor; the single leading-in lead and the single leading-out lead are the same in structure and arranged symmetrically; the single leading-out lead comprises a normal-temperature outlet wire segment, a vacuum heat insulation segment and a superconductive connection segment arranged successively; and the normal-temperature outlet wire segment is different from the normal-temperature inlet wire segment in that the inlet wire terminal is replaced with an outlet wire terminal. The high-voltage heavy-current electrode lead is applied to a superconductive current limiter, and serves as a connecting wire between a superconductive band material and an external cable; and the lead is characterized by being high in insulating intensity, having a heavy current passing capability, being capable of working in the large temperature gradient and being low in heat leakage.

Description

technical field [0001] The invention belongs to the application field of high-voltage insulation, and in particular relates to an electrode lead wire; the lead wire needs to have insulation strength capable of withstanding high voltage and high current, can work under a large temperature gradient, and has low heat leakage at the same time. Background technique [0002] In the superconducting current limiting device, the superconducting strip operates at a temperature range of 77K (liquid nitrogen temperature) and below to maintain the superconducting state, and the conductor connecting the superconducting strip and the room temperature power supply is called the current lead. The temperature range of the current lead spans from the temperature of the low-temperature cooling medium to room temperature, thus forming a large temperature gradient, which becomes the main leakage heat source of the system, also called a thermal bridge. At the same time, the Joule heat generated by ...

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Problems solved by technology

[0007] However, the above-mentioned leads have disadvantages in use. Air-cooled leads need to introduce low-temperature gas, which affects the insulation of the system; superconducting leads require low-temperature liquid to ensure superconducting properties, which increases the complexity of system design.

[0008] The current patented leads, such as patent CN 102243908: a low-temperature insulation structure of air-cooled leads, due to the use of air-cooled cooling, not only need to add a cooling device, but also due to the existence of flowing gas, it is impossible to use a vacuum on the layer close to the lead, which increases the The Difficulty of Insulation Design

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