Superconducting tape current transfer capability measuring probe, measuring device and method thereof

Abstract

The invention relates to the field of superconducting electrical engineering and especially relates to a superconducting tape current transfer capability measuring probe, a measuring device and a method thereof. The superconducting tape current transfer capability measuring probe comprises a magnetic circuit, a detection winding and a measuring circuit which is connected to the detection winding. The magnetic circuit comprises a magnetic circuit core, an excitation winding and an adjustable power supply which provides current to the excitation winding. The excitation winding and the detection winding are respectively wounded around the magnetic circuit core which is provided with a slot for containing a superconducting tape sample to be measured. A closed magnetic circuit is formed by the magnetic circuit core and the slot. The magnetic field amplitude in the slot is adjusted through the excitation winding and the adjustable power supply which provides current to the excitation winding, and the detection winding and the measuring circuit which is connected to the detection winding measure the current transmission capacity of the superconducting tape sample to be measured in the slot. The superconducting tape current transfer capability measuring probe can measure the local current transmission characteristic of a superconducting tape along a tape width direction and can measure the overall current transmission characteristic of the superconducting tape in an external magnetic field.

Description

technical field [0001] The invention relates to the field of superconducting engineering, in particular to a measuring probe, measuring device and method for the current transmission capability of a superconducting strip. Background technique [0002] Superconducting materials can be widely used in large-scale electric devices because of their unimpeded ability to carry large currents. It can be expected that the era of large-scale use of high-temperature superconducting materials will come soon. Current transport performance is the most basic parameter reflecting the performance of superconducting tapes. At present, the "four-lead method" is generally used to measure the transmission performance of the critical current reflecting the current, that is, to load the current at both ends of the sample and observe the voltage signal. As the current increases, the critical current of the superconducting strip is determined by observing the increase of the voltage and taking 1 mi...

AI Technical Summary

Problems solved by technology

First of all, the current lead and voltage lead need to be in contact with the strip during measurement, which may cause mechanical damage to the superconducting strip. Secondly, the test efficiency is also very low, and it is inconvenient to realize continuous and rapid measurement of the 100-meter-long strip.

[0003] In view of the lack of continuous measurement capability of the high-temperature superconducting strip by the four-lead method, researchers have developed a method for detecting the current transmission capacity of the superconducting strip by the magnetic circuit method, such as patent zl201010033688.5, which uses a double-slit magnetic circuit and The Hall probe realizes the measurement of the current transmission capacity of the high-temperature superconducting strip, but this method needs to set two slits in the magnetic circuit, which leads to a significant drop in the excitation capacity of the magnetic circuit. Sometimes, it is necessary to detect a small signal of 2-3 orders of magnitude under a large background magnetic field, resulting in a large error, which is not conducive to practical application

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