Device and method for testing electrical performance of insulating material at large temperature gradient and extremely low temperature

Abstract

The invention belongs to the technical field of electrical performance tests, and relates to an electrical performance test device and method for a low-temperature insulating material, in particular to a device and a method for testing electrical performance of an insulating material at the large temperature gradient and extremely low temperature. The device comprises a bottom support, a barrel-shaped vacuum cover, a primary cold shield and a sample cavity are installed above the bottom support from outside to inside, a vacuum extraction assembly, a vacuum high-pressure connector, a refrigeration assembly and a low-temperature assembly are further installed in the bottom support, and the vacuum extraction assembly, the refrigeration assembly and the low-temperature assembly are all communicated with the sample cavity. The vacuum high-voltage connector is conducted with an electrode mounted in the sample cavity, the barrel-shaped vacuum cover is used for hermetically isolating the sample cavity from the external environment, the primary cold screen is used for controlling the interior of the sample cavity to be in a low-temperature environment to slow down inward diffusion of external heat, and a tested sample is placed in the sample cavity.

Description

technical field [0001] The invention belongs to the technical field of electrical performance testing, and relates to an electrical performance testing device and method for low-temperature insulating materials, in particular to an electrical performance testing device and method for insulating materials in a large temperature gradient and extreme low temperature environment. Background technique [0002] With the gradual maturity of high-temperature superconducting materials and the reduction of operating costs, high-temperature superconducting technology has gradually been applied to projects in the field of electric energy such as superconducting cables, superconducting current limiters, superconducting transformers, and superconducting energy pipelines. However, the insulating materials that are indispensable for power equipment mostly work in the environment of liquid nitrogen temperature in high-temperature superconducting equipment, and the insulating materials at the ...

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Problems solved by technology

[0004] (1) The law of large temperature gradient and extreme low temperature on the initiation and development of partial discharge in insulating materials is still unclear;

[0005] (2) The effect mechanism of large temperature gradient and extreme low temperature on insulation breakdown is not yet clear

[0007] However, the existing low-temperature insulating material test devices at home and abroad only consider the effect of a uniform temperature field, and cannot test and analyze the partial discharge, breakdown law and mechanism of insulating materials under the action of a large temperature gradient field under existing actual working conditions

[0008] After searching, no documents of the same or similar prior art were found

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