Tester for testing insulation low-temperature performance of superconducting electrical component

Abstract

The invention discloses a tester for testing the insulation low-temperature performance of a superconducting electrical component. The tester comprises a vacuum pressure container, a testing container seal flange is arranged at the top of the vacuum pressure container, a low-temperature superconducting testing component is arranged in the vacuum pressure container, a temperature sensor is fixed on the side wall of a low-temperature superconducting testing component and is connected with a temperature and leakage current data acquisition system, the upper end of the low-temperature superconducting testing component extends out of the testing container seal flange and is connected with a high potential line, and an insulating surface of the lower end of the low-temperature superconducting testing component and the side wall of the vacuum pressure container are connected with low potential lines. Through the tester disclosed by the invention, the outside insulation low-temperature DC (Direct Current) resisting high-voltage performance of the superconducting electric component can be detected under Paschen conditions, the testing range of temperature is 4.5-300K, the testing range of air pressure is 103-105Pa, the control precision of the temperature and the air pressure are high, and high voltage and low voltage are convenient to be fed in or out; simultaneously, the purposes of continuously testing the insulation performance under various conditions such as normal pressure and temperature, low temperature and air pressure, thermal circulation and the like can be effectively realized.

Description

[0001] technical field [0002] The invention relates to the design field of a low-temperature insulation performance inspection and testing device for superconducting current leads, and provides feasible quality verification means for insulation schemes of various low-temperature electrical components such as superconducting feeders. [0003] Background technique [0004] Paschen's law describes the nonlinear functional relationship between the gas breakdown voltage and the distance between two electrodes and the gas pressure. The Paschen discharge phenomenon is a gas discharge property, which is closely related to the physical properties of the gas itself. At the same time, the change of the position between the discharge electrodes also has a direct impact on the discharge properties. When the electrode position is fixed, the gas pressure reaches a certain range, and only a very low voltage will cause the discharge phenomenon. At room temperature, Paschen discharge occu...

AI Technical Summary

Problems solved by technology

However, due to the electromagnetic force load and thermal stress of the magnet system, the insulating layer of superconducting electrical components may suffer physical damage such as cracking and aging after long-term low-temperature environment operation and cold and thermal cycles, and the insulating layer manufacturing process itself may also exist. Some inherent defects, the accumulation of these unfavorable factors will provide the necessary discharge path for Paschen discharge

If insulation defects have already occurred, and a certain degree of vacuum leakage or pipeline helium leakage occurs at the same time, Paschen discharge accidents are likely to occur at this time

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