GB/T 21546-2008 English PDF

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GB/T 21546-2008: Critical current measurement -- DC critical current of Nb-Ti composite superconductors
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21546-2008	414	Add to Cart	4 days	Critical current measurement -- DC critical current of Nb-Ti composite superconductors	Valid

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Basic data

Standard ID: GB/T 21546-2008 (GB/T21546-2008)
Description (Translated English): Critical current measurement -- DC critical current of Nb-Ti composite superconductors
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H21
Classification of International Standard: 77.040.01
Word Count Estimation: 21,229
Date of Issue: 2008-03-31
Date of Implementation: 2008-11-01
Quoted Standard: GB/T 13811-2003
Adopted Standard: IEC 61788-1-2006, IDT
Regulation (derived from): National Standard Approval Announcement 2008 No.5 (Total No.118)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard applies to the determination of copper-Super ratio greater than 1 DC critical current of Cu/Nb-Ti composite superconductors, are equally applicable to the determination of niobium titanium wire core diameter greater than 1��m, Copper-Ultra ratio greater than 0. 9, copper-nickel alloy-superconductor ratio is greater than 0. 2 Cu/Cu Ni/Nb-Ti superconducting wire DC critical current. Needed due to the Cu/Nb-Ti composite superconductors and copper/copper-nickel/niobium titanium superconductor critical current two slightly different test methods, the standard Annex C (normative) will introduce the measure copper/copper-nickel/niobium titanium superconductor Special to comply. This standard test method is applicable under standard test conditions in which the magnetic superconductor is less than or equal to 0. 7 times the upper critical field, critical current of less than 1000A, n is greater than the superconductor 12. Measurement, the sample should be immersed in liquid helium at a known temperature. Conductor should be tested for the integration of superconducting wire circular or rectangular cross-section, the cross-sectional area of ??less than 2 mm 2. The sample should have a helical coil geometry. This standard is also given in daily testing of the experimental method allowed deviation and other specifically defined. The critical current is greater than 1000A or greater than 2 mm 2 cross-sectional area of ??the conductor can also use this method of measurement, but the measurement uncertainty will increase, and the self-field effect is more pronounced. Furthermore, in order to maintain a simple and relatively low measurement uncertainty, this standard does not involve special sample shape for large conductor cross-section may be more suitable. This standard measurement method given through appropriate modifications applicable to other types of composite superconducting wire measuring critical current.

GB/T 21546-2008: Critical current measurement -- DC critical current of Nb-Ti composite superconductors

---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.
Critical current measurement. DC critical current of Nb-Ti composite superconductors ICS 77.040.01 H21 National Standards of People's Republic of China GB/T 21546-2008/IEC 61788-1.2006 Nb-Ti composite superconductors critical current measurement DC (IEC Superconductivity-Part 1. Criticalcurrentmeasurement- DCcriticalcurrentofNb-Ticompositesuperconductors, IDT) Posted 2008-03-31 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is based on international standards developed by the International Electrotechnical Commission IEC 61788-1.2006 "Critical DC electrical Nb-Ti composite superconductors Flow Measurement "developed on the technical content equivalent to the international standards. In order to allow users to understand the terms of this standard and GB/T 13811-2003 "Electrotechnical Terminology superconductivity" correspondence between this standard Registration entry various terms are stated there GB/T 13811-2003 entry number. GB/T 13811-2003 and IEC members It will develop international standards IEC 60050 (815) identical in technical content. The Standard Appendix A, Appendix B and Appendix D is an informative annex, appendix C normative appendix. This standard was proposed by the National Superconducting technology joint research and development centers and the National Standardization Technical Committee superconductivity. This standard by the National Standardization Technical Committee superconductivity. This standard is drafted by. Institute of Electrical Engineering and the National Superconducting technology joint research and development centers. Participated in the drafting of this standard. Microsystem and Information Technology Institute of Chinese Academy of Sciences, Beijing Nonferrous Metal Research Institute, China Science and Technology Science, Northwest Nonferrous Metal Research Institute. The main drafters of this standard. Lin Liangzhen, Huidong, Liu Yiping, Zhang Hua Chong far, Cao Liezhao, Wangjing Rong. This standard was first published. GB/T 21546-2008/IEC 61788-1.2006

Introduction

The critical current of composite superconductors can provide reference for the design of superconducting wire applications. In practice, depending on the performance of the superconductor 3.1 IC In superconductors, it is considered to be the maximum DC current through unhindered. NOTE. IC is a function of temperature and magnetic field strength. 3.2 ρ criterion for determining the critical current in accordance with the electric field intensity E or resistivity. Note. Commonly used as a criterion for the electric field strength E = 10μV/m or E = 100μV/m, resistivity criterion is ρ = 10-13Ω · m or ρ = 10-14Ω · m. 3.3 The electric field intensity at a particular range of resistivity or superconductor current - voltage curves of the U (I) can be approximated as U αI shape, wherein I is The value of the exponent is shaped superconductor. GB/T 21546-2008/IEC 61788-1.2006 ......

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