CENELEC
Project
| Reference | EN 61788-8:2010 |
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| Title | Superconductivity - Part 8: AC loss measurements - Total AC loss measurement of round superconducting wires exposed to a transverse alternating magnetic field at liquid helium temperature by a pickup coil method |
| Project Number | 22214 |
| Abstract/Scope | IEC 61788-8:2010(E) specifies the measurement method of total AC losses by the pickup coil method in composite superconducting wires exposed to a transverse alternating magnetic field. The losses may contain hysteresis, coupling and eddy current losses. The standard method to measure only the hysteresis loss in DC or low-sweep-rate magnetic field is specified in IEC 61788-13. In metallic and oxide round superconducting wires expected to be mainly used for pulsed coil and AC coil applications, AC loss is generated by the application of time-varying magnetic field and/or current. The contribution of the magnetic field to the AC loss is predominant in usual electromagnetic configurations of the coil applications. For the superconducting wires exposed to a transverse alternating magnetic field, the present method can be generally used in measurements of the total AC loss in a wide range of frequency up to the commercial level, 50/60 Hz, at liquid helium temperature. For the superconducting wires with fine filaments, the AC loss measured with the present method can be divided into the hysteresis loss in the individual filaments, the coupling loss among the filaments and the eddy current loss in the normal conducting parts. In cases where the wires do not have a thick outer normal conducting sheath, the main components are the hysteresis loss and the coupling loss by estimating the former part as an extrapolated level of the AC loss per cycle to zero frequency in the region of lower frequency, where the coupling loss per cycle is proportional to the frequency. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. The main changes with respect to the previous edition are listed below: - extending the applications of the pickup coil method to the a.c. loss measurements in metallic and oxide superconducting wires with a round cross section at liquid helium temperature, - using the word 'uncertainty' for all quantitative (associated with a number) statistical expressions and eliminating the quantitative use of 'precision' and 'accuracy'. |
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Published
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Status
| Current Stage code | 6060 |
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| Current Stage code date | 2010-11-26 |
| Current Stage code deadline | 2011-07-01 |
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Details
| IEC Technical Body | IEC/TC 90 |
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| Reference Document | IEC 61788-8:2010 (EQV) |
| ICS | 17.220 - Electricity. Magnetism. Electrical and magnetic measurements |
| Keywords | Superconductivity; Loss measurement; Wire; Transverse; Helium |
| Note | Supersedes EN 61788-8:2003 |
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History
Implementation Dates
| date of Ratification (DOR) (1) | 2010-10-01 |
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| date of Availability (DAV) (2) | 2010-11-26 |
| date of Announcement (DOA) (3) | 2011-01-01 |
| date of Publication (DOP) (4) | 2011-07-01 |
| date of Withdrawal (DOW) (5) | 2013-10-01 |
Relations
| Supersedes | EN 61788-8:2003 |
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| Superseded by | |
| Normative reference (6) | IEC 60050-815 |
(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved
(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat
(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level
(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement
(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn
(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.
