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GB/T 42472-2023 English PDF

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GB/T 42472-2023: Critical current measurement - Retained critical current after double bending at room temperature of Ag-sheathed Bi-2223 superconducting wires
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 42472-2023	English	424	Add to Cart	4 days [Need to translate]	Critical current measurement - Retained critical current after double bending at room temperature of Ag-sheathed Bi-2223 superconducting wires	Valid	GB/T 42472-2023

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Basic data

Standard ID	GB/T 42472-2023 (GB/T42472-2023)
Description (Translated English)	Critical current measurement - Retained critical current after double bending at room temperature of Ag-sheathed Bi-2223 superconducting wires
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H21;K11
Classification of International Standard	77.040.01, 29.050
Word Count Estimation	23,241
Date of Issue	2023-03-17
Date of Implementation	2023-10-01
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration

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

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS77:040:01;29:050 CCSH21;K11 National Standards of People's Republic of China GB/T 42472-2023/IEC 61788-24:2018 Critical current measurement Silver sheathed Bi-2223 superconducting wire after double bending at room temperature reserve critical current (IEC 61788-24:2018, Superconductivity-Part 24:Criticalcurrent 2023-03-17 release 2023-10-01 implementation State Administration for Market Regulation Released by the National Standardization Management Committee

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Principle 2 5 device 2 5:1 General 2 5:2 Bending mandrel 2 5:3 Critical current measurement framework 2 5:4 Critical current measurement system 2 6 Sample preparation and installation 2 6:1 Sample length2 6:2 Sample installation 3 7 Measurement Step 3 7:1 Critical current measurement 3 7:2 Double bend 4 7:3 Critical current after bending 4 8 Result calculation 4 8:1 Critical current criterion 4 8:2 n-value (optional) 4 9 Test report 4 9:1 Identification of test samples 4 9:2 Reporting of Ic value and/or retained Ic ratio5 9:3 Ic test condition report 5 Appendix A (informative) Additional information related to Chapters 1 to 9 of this document 6 Appendix B (informative) Evaluation of combined standard uncertainty of critical current retained after double bending 12 Reference 17

foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting: This document is equivalent to IEC 61788-24:2018 "Superconductivity Part 24: Critical current measurement silver-coated Bi-2223 superconductor Retained critical current after double bending of wire at room temperature": The following minimal editorial changes have been made to this document: ---Changed from "Critical Current Measurement of Residual Critical Current of Silver-coated Bi-2223 Superconducting Strip after Double Bending at Room Temperature" to "Critical Current Measuring the retained critical current after double bending of silver-coated Bi-2223 superconducting wires": This document was proposed by the Chinese Academy of Sciences: This document is under the jurisdiction of the National Superconducting Standardization Technical Committee (SAC/TC265): This document is drafted by: Institute of Electrical Engineering, Chinese Academy of Sciences, Institute of Physics, Chinese Academy of Sciences, China Electric Power Research Institute Co:, Ltd:, Western Superconducting Materials Technology Co:, Ltd:, Institute of Plasma Physics, Chinese Academy of Sciences, Shanghai Shangchuang Superconducting Technology Co:, Ltd:, Fortis Group (Tianjin) Superconducting Technology Application Co:, Ltd: The main drafters of this document: Zhang Guomin, Jing Liwei, Shi Yue, Zhang Dong, Qiu Ming, Gao Huixian, Liu Fang, Zhang Yongjun, Cao Yujun:

Introduction

High-temperature superconductors have been discovered for more than 30 years: Because of their advantages such as high critical temperature and high current-carrying density, they have become the most important fields in the fields of electric power, electronics, transportation, etc: important basic materials; with the national carbon peak and carbon neutral goals put forward, the development of new energy power technology has become an urgent need, superconducting Materials and technologies are considered as optional basic materials and technologies in this technological change: At present, commercial high-temperature superconducting materials are mainly YBCO and Bi-SCCO, among which Bi-2223 tape is the earliest commercialized first-generation high-temperature superconducting tape, used for superconducting magnets and superconducting power There are many studies on equipment: The high critical temperature and thermal stability of Bi-2223 superconducting tape make it more suitable for weak magnetic field applications such as superconducting power cables: use: Since the high-temperature superconducting material is an oxide ceramic, the mechanical properties are poor, although the commercialized superconducting strip is reinforced by metal alloy coating Composite conductors have been made with advanced technology, which improves their mechanical properties, but there are still critical tensile and bending values: In the winding process of the superconducting device, the superconducting The ribbon is inevitably bent or stretched, and the winding process is usually carried out at room temperature: Sexuality is important: This document covers two basic techniques, the critical current measurement and the double bending process: Critical current measurement Silver sheathed Bi-2223 superconducting wire after double bending at room temperature reserve critical current

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:

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