Low-temperature insulating structure of gas-cooled lead

Abstract

The invention belongs to the technical field of low-temperature and superconducting application and particularly relates to a low-temperature insulating structure of a gas-cooled lead. The structure provided by the invention comprises a vacuum flange and a three-layer insulating structure which is arranged on the outer surface of the gas-cooled lead, wherein the three-layer insulating structure comprises a lead inner protective layer, a low-temperature insulating layer and an outer protective layer which are sequentially arranged from interior to exterior; and the vacuum flange is connected with the gas-cooled lead which is arranged at the inner core of the three-layer insulating structure through bolts. The low-temperature insulating structure provided by the invention can stand a 5min power frequency voltage test of a more than 35kV voltage class, a thunder impulse voltage test, a partial discharge test, a 15min alternating current withstand voltage test, a direct current withstand voltage test and the like, has the advantages of excellent electric property parameters, reasonable electric field and magnetic field distribution, low heat leakage and integral vacuum tightness withstand voltage properties with a stainless steel liquid nitrogen container, and can be used for improving the stability of a system and greatly lowering the investment cost.

Description

Technical field [0001] The invention belongs to the technical field of low temperature and superconductivity applications, and specifically relates to a low temperature insulation structure of an air-cooled lead. Background technique [0002] Current leads are an important part of many cryogenic superconducting systems. It is responsible for connecting the power supply at the room temperature end and the superconducting device at the low temperature end to ensure the normal power supply of the superconducting device. In many superconducting systems, the leakage heat of current leads is one of the most important heat sources in low temperature environments. In order to reduce the low-temperature heat leakage of the current lead, the nitrogen gas evaporated from the lead itself to the low-temperature leakage heat is usually flowed through the lead, and the Joule heat generated by the lead and the external heat leakage to the lead are taken away by the cooling gas. Many internatio...

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Problems solved by technology

The existing insulation designs for air-cooled leads listed above in low temperature environments are only used for conventional electrical isolation and insulation, without considering the special requirements for electrical insulation materials and structures in medium voltage environments

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