{"id":250424,"date":"2024-10-19T16:31:13","date_gmt":"2024-10-19T16:31:13","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-61788-262020\/"},"modified":"2024-10-25T11:44:43","modified_gmt":"2024-10-25T11:44:43","slug":"bs-en-iec-61788-262020","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-61788-262020\/","title":{"rendered":"BS EN IEC 61788-26:2020"},"content":{"rendered":"

IEC 61788-26:2020 specifies a test method for determining the DC critical current of short RE (rare earth)-Ba-Cu-O (REBCO) composite superconductor specimens that have a shape of straight flat tape. This document applies to test specimens shorter than 300 mm and having a rectangular cross section with an area of 0,03 mm2<\/sup> to 7,2 mm2<\/sup>, which corresponds to tapes with width ranging from 1,0 mm to 12,0 mm and thickness from 0,03 mm to 0,6 mm. This method is intended for use with superconductor specimens that have critical current less than 300 A and n-values larger than 5 under standard test conditions: the test specimen is immersed in liquid nitrogen bath at ambient pressure without external magnetic field during the testing. Deviations from this test method that are allowed for routine tests and other specific restrictions are given in this document.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nundefined <\/td>\n<\/tr>\n
5<\/td>\nAnnex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n
7<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
9<\/td>\nFOREWORD <\/td>\n<\/tr>\n
11<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
12<\/td>\n1 Scope
2 Normative references
3 Terms and definitions <\/td>\n<\/tr>\n
13<\/td>\n4 Principle
5 Apparatus
5.1 General
5.2 Critical current measuring system
6 Specimen preparation and setup
6.1 Length <\/td>\n<\/tr>\n
14<\/td>\n6.2 Mounting of the specimen
7 Critical current measurement
8 Calculation of results
8.1 Critical current criteria
Figures
Figure 1 \u2013 Schematic view of measurement setup <\/td>\n<\/tr>\n
15<\/td>\nFigure 2 \u2013 Intrinsic U-I characteristic
Figure 3 \u2013 U-I curve with a current transfer component <\/td>\n<\/tr>\n
16<\/td>\n8.2 n-value (optional)
9 Uncertainty of measurement
10 Test report
10.1 Identification of test specimen
10.2 Reporting of Ic values
10.3 Reporting of Ic test conditions <\/td>\n<\/tr>\n
17<\/td>\nAnnex A (informative)Additional information relating to measurement, apparatus, and calculation
A.1 General information
A.2 Measurement condition <\/td>\n<\/tr>\n
18<\/td>\nA.3 Apparatus
A.3.1 Measurement holder material
A.3.2 Measurement holder construction
Figure A.1 \u2013 Illustration of a measurement configuration fora short specimen of a few hundred amperes class REBCO conductor
Tables
Table A.1 \u2013 Thermal contraction data of superconductor and sample\u2011holder materials [1] <\/td>\n<\/tr>\n
19<\/td>\nA.4 Specimen preparation
A.5 Measurement procedure
A.5.1 Voltage leads
A.5.2 Cooling process
A.5.3 Temperature of liquid nitrogen bath
Figure A.2 \u2013 Temperature dependence of Ic forcommercial REBCO superconductors (data from [9]) <\/td>\n<\/tr>\n
20<\/td>\nA.5.4 System noise and other contributions to the measured voltage
Figure A.3 \u2013 Pressure dependence of boiling temperature of liquid nitrogen <\/td>\n<\/tr>\n
21<\/td>\nA.6 Calculation of n-value <\/td>\n<\/tr>\n
22<\/td>\nAnnex B (informative)Evaluation of combined standard uncertainty for REBCO Ic measurement [8]
B.1 Practical critical current measurement
Figure B.1 \u2013 Typical circuit to measure Ic <\/td>\n<\/tr>\n
23<\/td>\nB.2 Model equation
Figure B.2 \u2013 Typical voltage\u2013current (U-I) characteristic of a superconductor <\/td>\n<\/tr>\n
24<\/td>\nB.3 Ic measurement results
Table B.1 \u2013 Conductors distributed in the international RRT
Table B.2 \u2013 Ic data for conductor A <\/td>\n<\/tr>\n
25<\/td>\nTable B.3 \u2013 Ic data for conductor B
Table B.4 \u2013 Ic data for conductor C
Table B.5 \u2013 Ic data for conductor D <\/td>\n<\/tr>\n
26<\/td>\nB.4 Combined standard uncertainty [11]
Table B.6 \u2013 Statistics for each conductor
Table B.7 \u2013 ANOVA results for each conductor <\/td>\n<\/tr>\n
27<\/td>\nB.5 Type B uncertainty evaluation
B.5.1 General
B.5.2 Uncertainty of L1 measurement
B.5.3 Uncertainty of voltage measurement <\/td>\n<\/tr>\n
28<\/td>\nB.5.4 Uncertainty of current measurement
B.5.5 Uncertainty of temperature measurement <\/td>\n<\/tr>\n
29<\/td>\nB.5.6 Uncertainty coming from intrinsic non-uniformity of Ic
Table B.8 \u2013 Atmospheric pressure from 1 January 2014 to 31 December 2014
Table B.9 \u2013 Intrinsic Ic non-uniformity evaluated by RTR-SHPM <\/td>\n<\/tr>\n
30<\/td>\nB.5.7 Comparison between types A and B combined standard uncertainties
Table B.10 \u2013 Budget table of SUs of Ic measurements for conductor C
Table B.11 \u2013 Comparison of the relative standard uncertaintiesfor conductors B, C, and D <\/td>\n<\/tr>\n
31<\/td>\nB.6 Influence of current ramp rate on the total uncertainty
Figure B.3 \u2013 Ramp time dependence of total RSU of Ic for conductors B, C, and D <\/td>\n<\/tr>\n
32<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Superconductivity – Critical current measurement. DC critical current of RE-Ba-Cu-O composite superconductors<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2020<\/td>\n34<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":250431,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-250424","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/250424","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/250431"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=250424"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=250424"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=250424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}