1、BRITISH STANDARD BS EN 60404-2:1998 +A1:2008 Magnetic materials Part 2: Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of an Epstein frame ICS 29.030 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/06/2009 08:50, Uncontrolled Copy, (c) BSIBS
2、EN 60404-2:1998+A1:2008 This British Standard was published under the authority of the Standards Board and comes into effect on 15 September 1996 BSI 2009 First published February 1985 Second edition August 1996 ISBN 978 0 580 65048 2 National foreword This British Standard is the UK implementation
3、of EN 60404-2:1998+A1:2008. It is identical with IEC 60404-2:1996, incorporating amendment 1:2008. It supersedes BS EN 60404-2:1998 which is withdrawn. The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to IEC text carry the numb
4、er of the IEC amendment. For example, text altered by IEC amendment 1 is indicated by !“. The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/5, Magnetic alloys and steels. A list of organizations represented on this committee can be obtained on request to its secret
5、ary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication Amd. No. Date Comments 100
6、38 July 1998 Renumbers BS 6404-2:1996 as BS EN 60404-2:1998 31 January 2009 Implementation of IEC amendment 1:2008 with CENELEC endorsement A1:2008 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/06/2009 08:50, Uncontrolled Copy, (c) BSIi Contents Page Foreword 2 1 Scope and object 3 2 Nor
7、mative references 3 3 General principles of a.c. measurements 3 4 Procedure for the measurement of the specific total loss 5 5 Procedure for the determination of the peak value of magnetic polarization, r.m.s value of magnetic field strength, peak value of magnetic field strength and specific appare
8、nt power 7 6 General principles of d.c. measurements 9 7 Procedure for the d.c. measurement of the magnetic polarization 9 8 Test report 10 Annex ZA (normative) Normative references to international publications with their corresponding European publications 19 Figure 1 Double-lapped joints 10 Figur
9、e 2 The 25 cm Epstein frame 11 Figure 3 Circuit for the wattmeter method 11 Figure 4 Circuit for measuring the r.m.s value of the magnetizing current 12 Figure 5 Circuit for measuring the peak value of the magnetic field strength using a peak voltmeter 12 Figure 6 Circuit for measuring the peak valu
10、e of magnetic field strength using a mutual inductor M D 13 Figure 7 Circuit for d.c. testing: to obtain discrete values of magnetic polarization 13 Figure 8 Circuit for d.c. testing: continuous recording method 14 Annex A (informative) Digital sampling methods for the determination of the magnetic
11、properties 15 Bibliography 18 BS EN 60404-2:1998+A1:2008 BSI 2008 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/06/2009 08:50, Uncontrolled Copy, (c) BSIblank Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/06/2009 08:50, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD NORME EUROPE
12、NNE EUROPISCHE NORM EN 60404-2:1998+A1 July 2008 ICS 29.030 Descriptors: Magnetic materials, measurement of magnetic properties of electrical steel sheet and strip, general principle, procedure, Epstein frame English version Magnetic materials Part 2: Methods of measurement of the magnetic propertie
13、s of electrical steel strip and sheet by means of an Epstein frame (IEC 60404-2:1996) Matriaux magntiques Partie2:Mthodesdemesure des proprits magntiques des tles et bandes magntiques au moyen dun cadre Epstein (CEI 60404-2:1996) Magnetische Werkstoffe Teil2:VerfahrenzurBestimmung der magnetischen E
14、igenschaften von Elektroblech und -band mit Hilfe eines Epsteinrahmens (IEC 60404-2:1996) This European Standard was approved by CENELEC on 1998-01-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the s
15、tatus of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, Geman
16、). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Repu
17、blic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr E
18、lektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1998 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60404-2:1998 E Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/06/2009 08:50, Uncontrol
19、led Copy, (c) BSI2 Foreword The text of the International Standard IEC 60404-2:1996, prepared by IEC TC68, Magnetic alloys and steels, was submitted to the formal vote and was approved by CENELEC as EN 60404-2 on 1998-01-01 without any modification. The following dates were fixed: Annexes designated
20、 “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 60404-2:1996 was approved by CENELEC as a European Standard without any modification. latest date by which the
21、 EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-12-01 Foreword to amendment A1 The text of document 68/365/FDIS, future
22、The following dates were fixed: Endorsement notice The text of amendment 1:2008 to the International Standard IEC 60404-2:1996 was approved by CENELEC as an amendment to the European latest date by which the amendment has to be implemented at national level by publication of an identical national st
23、andard or by endorsement (dop) 2009-03-01 latest date by which the national standards conflicting with the amendment have to be (dow) 2011-06-01 amendment 1 to IEC 60404-2:1996, prepared by IEC TC 68, Magnetic alloys and steels, was and was approved by CENELEC as amendment A1 to EN 60404-2:1998 on 2
24、008-06-01. submitted to the IEC-CENELEC parallel vote Standard without any modification. BS EN 60404-2:1998+A1:2008 BSI 2008withdrawn Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/06/2009 08:50, Uncontrolled Copy, (c) BSI3 1 Scope and object This part of IEC404 is applicable to grain ori
25、ented and non-oriented electrical sheet and strip for a.c. measurements of magnetic properties at frequencies up to 400Hz and for d.c. magnetic measurements. The object of this part is to define the general principles and the technical details of the measurement of the magnetic properties of electri
26、cal steel sheet and strip by means of an Epstein frame. The Epstein frame is applicable to test specimens obtained from electrical steel sheets and strips of any grade. The a.c. magnetic characteristics are determined for sinusoidal induced voltages, for specified peak values of magnetic polarizatio
27、n and for a specified frequency. The measurements are to be made at an ambient temperature of (23 5) C on test specimens which have first been demagnetized. Measurements at higher frequencies are to be made in accordance with IEC404-10. NOTEThroughout this standard the term “magnetic polarization” i
28、s used as defined in IEC50(221). In some standards of the IEC404 series, the term “magnetic flux density” was used. 2 Normative references 3 General principles of a.c. measurements 3.1 Principle of the 25 cm Epstein frame method The 25cm Epstein frame which comprises a primary winding, a secondary w
29、inding and the specimen to be tested as a core, forms an unloaded transformer whose characteristics are measured by the method described in the following subclauses. 3.2 Test specimen The strips to be tested are assembled in a square, having double-lapped joints (see Figure 1), thus forming four bra
30、nches of equal length and equal cross-sectional area. The strips shall be sampled in accordance with the appropriate product standard in the IEC404-8 series. They shall be cut by a method which will produce substantially burr-free edges and, if so specified, heat treated in accordance with the corre
31、sponding product standard. They shall have the following dimensions: width b = 30mm 0,2mm; length 280mm k l k 320mm. The lengths of the strips shall be equal within a tolerance of 0,5 mm. When strips are cut parallel or normal to the direction of rolling, the edge of the parent sheet shall be taken
32、as the reference direction. The following tolerances shall apply for the angle between the specified and actual direction of cutting: 1 for grain oriented steel sheet; 5 for non-oriented steel sheet. Only flat strips shall be used. Measurements shall be made without additional insulation. BS EN 6040
33、4-2:1998+A1:2008 BSI 2008 !The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-221, Interna
34、tional Electrotechnical Vocabulary Chapter 221: Magnetic materials and components IEC 60404-4, Magnetic materials Part 4: Methods of measurement of d.c. magnetic properties of magnetically soft materials IEC 60404-8-3, Magnetic materials Part 8-3: Specifications for individual materials Cold- rolled
35、 electrical non-alloyed and alloyed steel sheet and strip delivered in the semi-processed state IEC 60404-8-4, Magnetic materials Part 8-4: Specifications for individual materials Cold- rolled non-oriented electrical steel sheet and strip delivered in the fully-processed state IEC 60404-8-7, Magneti
36、c materials Part 8-7: Specifications for individual materials Cold- rolled grain-oriented electrical steel sheet and strip delivered in the fully-processed state IEC 60404-10, Magnetic materials Part 10: Methods of measurement of magnetic properties of magnetic sheet and strip at medium frequencies
37、IEC 60404-13, Magnetic materials Part 13: Methods of measurement of density, resistivity and stacking factor of electrical steel sheet and strip “ Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/06/2009 08:50, Uncontrolled Copy, (c) BSI4 The number of strips comprising the test specimen sh
38、all be a multiple of four and is specified in the corresponding product standard. However, the active mass of the test specimen see equation (1) shall be at least 240g for strips 280mm long. 3.3 The 25 cm Epstein frame The 25cm Epstein frame (hereinafter referred to as the Epstein frame) shall consi
39、st of four coils into which the strips making up the test specimen are inserted (see Figure 2). A mutual inductor for air flux compensation is included with the Epstein frame. The winding formers supporting the coils are made of hard insulating material, such as phenolic paper. They have a rectangul
40、ar cross-section with 32mm inner width. A height of approximately 10mm is recommended. The coils shall be fixed to an insulating and non-magnetic base in such a way as to form a square (seeFigure 2). The length of the sides of the square formed by the internal edges of the strips of the test specime
41、n shall bemm (seeFigure 2). Each of the four coils shall have two windings: a primary winding, on the outside (magnetizing winding); a secondary winding, on the inside (voltage winding). NOTEAn electrostatic screen may be provided between these windings. The windings shall be distributed uniformly o
42、ver a minimum length of 190mm, each coil having one quarter of the total number of turns. The individual primary windings of the four coils shall be connected in series, as shall be the secondary windings. The number of primary and secondary turns may be adapted to the particular conditions prevaili
43、ng with regard to the power source, measuring equipment and frequency. NOTEThe total number of turns generally used and recommended is700 or 1000. In order to reduce the effect of the impedances of the windings as much as possible, the following requirements shall be met: NOTEThese requirements are
44、satisfied, for example, if windings with the following characteristics are used: total number of turns: N 1= 700, N 2= 700; primary (outer) winding: each of the four coils carries 175 turns of two copper wires connected in parallel, each with a nominal cross-sectional area of approximately 1,8 mm 2
45、, wound side by side in three layers; secondary winding: each of the four coils carries 175 turns of one copper wire with a nominal cross-sectional area of 0,8 mm 2wound in one layer. The effective magnetic path length, lm, of the magnetic circuit shall be conventionally assumed to be equal to 0,94
46、m. Therefore, the active mass, m a , that is the mass of the test specimen which is magnetically active, is given by: 3.4 Air flux compensation The mutual inductor for air flux compensation shall be located in the centre of the space enclosed by the four coils, its axis being directed normal to the
47、plane of the axes of these coils. The primary winding of the mutual inductor shall be connected in series with the primary winding of the Epstein frame, and the secondary winding of the mutual inductor shall be connected to the secondary winding of the Epstein frame in series opposition (seeFigure 3
48、). 220 +1 0 where R 1and R 2 are the resistances of the primary and secondary windings, respectively, in ohms; L 1and L 2 are the inductances of the primary and secondary windings, respectively, in henrys; N 1and N 2 are the total number of turns of the primary and secondary windings, respectively.
49、(1) where l is the length of a test specimen strip, in metres; l m is the conventional effective magnetic path length, in metres (l m= 0,94 m); m is the total mass of the test specimen, in kilograms; m a is the active mass of the test specimen, in kilograms. ma lm4l -m = BS EN 60404-2:1998+A1:2008 BSI 2008 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/06/
