GB/T 42472-2023Critical current measurement - Retained critical current after double bending at room temperature of Ag-sheathed Bi-2223 superconducting wires (English PDF)

1 Scope

This document describes the test method for the critical current after double bending of Bi-2223 oxide superconductor short straight samples at room temperature: The sample is a flat

Single-core or multi-core silver and/or silver-coated superconducting wires of flat or square structure: Superconducting wires can be stacked with copper alloy, stainless steel or nickel alloy

Layer encapsulation:

This document applies to superconductors with critical currents less than 300A and n-values greater than 5: The test of the critical current after double bending at room temperature without

The samples were immersed in open liquid nitrogen under the condition of adding a magnetic field:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document:

vocabulary(IEV)-Part 815:Superconductivity)

Note: GB/T 2900:100-2017 Electrotechnical Terminology Superconductivity (IEC 60050-815:2015, IDT)

3 Terms and Definitions

IEC 60050-815 and the following terms and definitions apply to this document: Terminology maintained by ISO and IEC for standardization

Database, the address is as follows:

---ISO online browsing platform: available from http://www:iso:org/obp

3:1 double bending doublebending

Bend to a certain diameter in one direction, then bend to the same diameter in the opposite direction:

Note 1: The bending diameter is defined as the diameter of the bending mandrel:

Note 2: The bending diameter is defined in principle as the sum of the mandrel diameter and the thickness of the superconductor: But in engineering, it is also necessary to consider the minimum diameter of the roller that the superconducting wire passes through:

3:2

Provide a direct current to the sample at a constant rate of rise, so that the current rises from zero to slightly greater than the critical current Ic, and at the same time continuously or

A method of collecting UI data at a certain sampling frequency:

3:3

Ramp-and-hold method

Set multiple appropriate current distribution points along the UI curve, so that after the current rises from one set point to another, it remains constant:

Constant current for a period of time, while recording several corresponding current and voltage values, and then continue to increase the current to subsequent set points to obtain UI data:

GB/T 43093 | GB/T 43092 | GB/T 42161 | GB/T 43894.2 | GB/T 13221 | […]