IEC TR61788-20:2014@IEC 2014 - 7 - licensed to BR Demo by Thomson P SUPERCONDUCTIVITY Part2o:Superconducting wires Categories of practical superconducting wires- General characteristics and guidance Scope Reuters( 1 This part of IEC 61788, which is a technical report, provides general characteristics and (Scientific), guidance on practical Sc wires. Particular focus is given to the characteristics that are different from those of ordinary copper and aluminium wires, since practical sC wires have appearance nearly identical to common electrical wires and can be used interchangeably with Inc., them. On the other hand, the practical SC wires are typically composite materials consisting of several functional materials asdescribed inAnnexA. Many forms of SC wires are described in Section 4 of IEC 60050-815, including single core wires,multi-filamentary superconducting wires,composite superconductors and coated .tec superconducting wires will be the focus in this technical report. A wire is considered as being practical if it can be procured in sufficiently continuous lengths under ordinary commercial transactions to build devices. com Conductors made of multiple wires, such as cables,for example,are not included in this dow scope. Since this report only addresses the characteristics of practical wires, other wires such as prototype,test sample and developmental wires are not included in the scope of this technical report. 2 Normativereferences The following documents, in whole or in part, are normatively referenced in this document and amendments)applies. No further (allparts)， International Electrotechnical Vocabulary IEC60050 (available at: <http://www.electropedia.org>) 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-815 apply. 4 CategoriesofpracticalSCwires Industrially available SC materials are classified into two categories by IEC 60050-815. The low temperature superconductors have a critical temperature less than 25 K. They are typically in the Nb-Ti group and NbgSn group, which is an intermetallic compound. The other category consists of high temperature superconductors such as BSCCO and REBCO and the intermetallic compound MgB2.In the present document, the five types of SC wire based on Uncontrolled when Copyrighted material licensed to BR Demo by Thomson Reuters (Scientific), Inc., - 8 - IECTR61788-20:2014@IEC2014 material is industrialized into wire form in the future, the current general requirements should bemodifiedbyintroducingitasanewpracticalSCwire. 5 Technical sheet assisting inthe specification and the use of practical Sc wires General items to agree between the supplier and the customer at the time of contract or purchase order are listed as follows. Except the recommended items mentioned here additional items providing for the specification are described in Annex C. The technical sheet maybe executed. 6 Class of practical SC wires One of the practical SC wires described inClause4maybe specified. Additional informative itemsarementioned inAnnex B. ., subscriptions.techstreet.com, downloaded on Nov-27-2014 by James Madison. No further reproduction or distribution is permited. Uncontrolled when print Productparameters Dimension may be settled in terms of the diameter of the round wire or the width / thickness of the rectangular wire together with the tolerance. Length and/or weight may be definitely settled. The necessityof insulationmaybe designated. The type of spooling may be designated. The shipping label designated in Clause 13 may be attached on the shipped product. Additional informative itemsarementioned inAnnex C 8 Joints Unless otherwise agreed upon by a customer and a supplier,no joints may be made in the completed wire. If joints are permitted within the wire, the customer and supplier are required 9 Appearance The appearance of the wire should be free from any imperfection not consistent with commercial practice. Additional informative items