1、BRITISH STANDARD BS 6404-12: 1993 IEC 404-12: 1992 Magnetic materials Part 12: Guide to methods of assessment of temperature capability of interlaminar insulation coatingsBS6404-12:1993 This British Standard, having been prepared under the directionof the Iron and Steel andthe Non-ferrous Metals Sta
2、ndards Policy Committees, waspublished under the authorityof the Standards Boardand comes into effect on 15 April1993 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference ISM/NFM/5 Draft for comment 90/42206 DC ISBN 0 580 21749 3 Committees responsible fo
3、r this British Standard The preparation of this British Standard was entrusted by the Iron and Steel Standards Policy Committee (ISM/-) and the Non-ferrous Metals Standards Policy Committee (NFM/-) to Technical Committee ISM/NFM/5, upon which the following bodies were represented: Association of Man
4、ufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd.) British Steel Industry Department of Trade and Industry (National Physical Laboratory) Electricity Supply Industry in England and Wales Electronic Components Industry Federation GAMBICA (BEAMA Ltd.) Institute of Physics Rotatin
5、g Electrical Machines Association (BEAMA Ltd.) Sunderland Polytechnic (Magnet Centre) Transmission and Distribution Association (BEAMA Ltd.) Wolfson Centre for Magnets Technology Coopted members Amendments issued since publication Amd. No. Date CommentsBS6404-12:1993 BSI 08-1999 i Contents Page Comm
6、ittees responsible Inside front cover National foreword ii Introduction 1 1 Scope and object 1 2 Normative references 1 3 Definitions 1 4 Requirements 2 Annex A (normative) Heating methods for test specimens 4 Annex B (normative) Method of test for adhesion (based on ISO 1519) 4 Figure 1 Example of
7、a clamped stack 5 Figure 2 Bend test apparatus 6 Figure 3 Details of bend test apparatus 7 Table 1 Untitled 2BS6404-12:1993 ii BSI 08-1999 National foreword This Part of BS6404 has been prepared under the direction of the Iron and Steel Standards Policy Committee and the Non-ferrous Metals Standards
8、 Policy Committee. It is identical with IEC404-12:1992 Magnetic materials Part12:Guide to methods of assessment of temperature capability of interlaminar insulation coatings, published by the International Electrotechnical Commission (IEC). This Part of BS 6404 is the twelfth in a series of British
9、Standards based on the IEC series, Magnetic materials. The Part numbers of the British Standards follow the Parts of the IEC publication. The following Parts of the British Standard have been published or will shortly be published. Part 1: Classification; Part 2: Methods of measurement of magnetic,
10、electrical and physical properties of magnetic sheet and strip; Part 3: Methods of measurement of specific total losses of magnetic sheet and strip by means of a single sheet tester; Part 4: Methods of measurement of the d.c.magnetic properties of solid steels; Part 5: Methods of measurement of the
11、magnetic properties of magnetically hard (permanent magnet) materials; Part 6: Methods of measurement of the magnetic properties of isotropic nickel-iron soft magnetic alloys, types E1, E3 and E4; Part 7: Method of measurement of the coercivity of magnetic materials in an open magnetic circuit; Part
12、 8: Individual materials; Section 8.1: Specification for magnetically hard materials; Section 8.2: Specification for cold-rolled, magnetic, non-oriented, alloyed steel strip delivered in the semi-processed state; Section 8.3: Specification for cold-rolled, magnetic, non-oriented, non-alloyed steel s
13、trip delivered in the semi-processed state; Section 8.4: Specification for cold-rolled, non-oriented, magnetic steel sheet and strip delivered in the finally annealed state; Section 8.5: Specification for steel sheet and strip with specified mechanical properties and magnetic permeability; Section 8
14、.6: Specification for soft magnetic metallic materials; Section 8.7: Specification for grain-oriented magnetic steel sheet and strip; Section 8.8: Specification for thin magnetic steel strip for use at medium frequencies; Part 9: Methods for determination of the geometrical characteristics of magnet
15、ic steel sheet and strip; Part 10: Methods of measurement of magnetic properties of magnetic steel sheet and strip at medium frequencies; Part 11: Method of test for the determination of surface insulation resistance of magnetic sheet and strip. Additional Parts and Sections of IEC404 will be publis
16、hed and are expected to provide a basis for additional Parts of BS 6404.BS6404-12:1993 BSI 08-1999 iii The Technical Committee has reviewed the provisions of IEC50(901):1973 and IEC216-1:1990, to which normative reference is made in the text, and has decided that they are acceptable for use in conju
17、nction with this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-referenc
18、es International standard Corresponding British Standard BS 4727 Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms Part 1 Terms common to power, telecommunications and electronics IEC 50(121):1978 IEC 50(131):1978 Group 01:1983 Fundamental terminology (Te
19、chnically equivalent) BS 6404 Magnetic materials IEC 404-8 Part 8 Individual materials (Most Sections identical or technically equivalent) IEC 404-11:1991 Part 11:1991 Method of test for the determination of surface insulation resistance of magnetic sheet and strip (Identical) ISO 1519:1973 BS 3900
20、Methods of test for paints Part E1:1970 Bend test (cylindrical mandrel) (Technically equivalent) Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages1to 7 and a back cover. This standard has been updated (see copyright date) and may have had amendments
21、incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS6404-12:1993 BSI 08-1999 1 Introduction Most magnetic steel sheet and strip used in electrical apparatus subjected to alternating flux requires an insulation coating which may be applied by the steel supp
22、lier or the user. The insulation coating is likely to be subjected to temperatures above ambient in service or during processing by the purchaser. The time it is held at any given temperature can vary considerably and the properties of an interlaminar insulation in relation to time and temperature a
23、re therefore important. Since the assessment of the properties of insulation coatings at higher temperatures is expensive and time-consuming, these properties are best established in relation to readily measurable properties at ambient temperature. Coated steel will normally be heated for the specif
24、ied time, then retested after cooling to ambient temperature. This guide is therefore prepared on the basis that the temperature capability of a given insulation will normally be evaluated by means of recommended type tests which will provide a common basis for the provision of information on charac
25、teristics by suppliers. It is, however, also necessary to define the equivalent properties at ambient temperature. 1 Scope and object This part of IEC 404, used as a guide, is primarily applicable to the evaluation of interlaminar insulation coatings applied to magnetic steel sheet and strip covered
26、 by the sections of IEC 404-8. This guide defines methods of test for evaluating the properties of interlaminar insulation coatings applied to magnetic steel sheet and strip in the range of temperatures from ambient to800 C as a basis for a type test. It covers the following properties of the materi
27、al: i) adhesion; ii) interlaminar resistance; iii) compressibility/stacking factor. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC404. At the time of publication, the editions indicated were
28、 valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC404 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid
29、International Standards. IEC 50(121):1978, International Electrotechnical Vocabulary (IEV) Chapter 121: Electromagnetism. IEC 50(131):1978, International Electrotechnical Vocabulary (IEV) Chapter 131: Electric and magnetic circuits. IEC 50(901):1973, International Electrotechnical Vocabulary (IEV) C
30、hapter 901: Magnetism. IEC 216-1:1990, Guide for the determination of thermal endurance properties of electrical insulating materials Part 1: General guidelines for ageing procedure and evaluation of test results. IEC 404-8, Magnetic materials Part8:Specifications for individual materials. IEC 404-1
31、1:1991, Magnetic materials Part11:Method of test for the determination of surface insulation resistance of magnetic sheet and strip. ISO 1519:1973, Paints and varnishes Bend test (cylindrical mandrel). 3 Definitions Definitions of the magnetic terms used in this part of IEC404 are given in IEC50(121
32、), IEC 50(131) and IEC 50(901). In addition for the purpose of this guide the following definitions apply: 3.1 temperature/time performance designation (T/t) the temperature/time performance designation of a coating in relation to a particular coating property comprises the temperature T C which the
33、 coating is able to withstand for time t (h) and meet the requirements of the appropriate test in this guide it serves to define the temperature capabilities of the coating NOTEA coating property may have more than one designation. Example: A designation 800/2 for a given property means the coating
34、is capable of withstanding 800 C for 2h. 3.2 type tests a series of tests taken on a representative sample of a coated material as a basis for evaluation of its propertiesBS6404-12:1993 2 BSI 08-1999 4 Requirements 4.1 Temperature/time performance designations The recommended standard temperature/ti
35、me performance designations are: 150/168; 180/168; 200/168; 250/168; 150/2500; 180/2500; 200/2500; 250/2500; 400/6; 500/0,5; 750/2; and 800/2. NOTEIt is impractical and uneconomic to test coatings continuously. For the purposes of this standard, the concepts of Appendix D of IEC216-1 have been appli
36、ed in a simplified form. (SeeclauseA.2 of Annex A.) 4.2 Tests for adhesion (based on ISO 1519) 4.2.1 Test specimen The test specimen shall normally be not less than30mm wide, 280mm 2,5mm long and of nominal thickness. It shall be cut parallel to the rolling direction without damage to the coating. F
37、our test specimens shall be cut from the sheet or strip at least40mm from the edges. NOTEA test on insulated magnetic sheet of one nominal thickness may be considered to be representative of coatings applied to sheets of other thicknesses. 4.2.2 Method of test Half of the test specimens shall be tes
38、ted in accordance with Annex B at a temperature of(23 5) C using a30mm diameter mandrel. For material coated on one surface or material coated on both surfaces, two specimens shall be tested, one with one of the surfaces against the mandrel and one with the other surface against the mandrel. The tes
39、t specimens shall be examined in accordance with clauseB.3 of Annex B. There shall be no detachment of the coating of the specimen. The remaining specimens shall be clamped and heated in accordance with one of the methods of clauseA.1 of Annex A. After cooling, the adhesion test shall be performed o
40、n the previously heated test specimens using a mandrel of the same diameter. If the coating becomes detached, the test shall be repeated with a40 mm mandrel and, if detachment still occurs, with a 50 mm diameter mandrel. If there is no detachment of the coating, it shall be considered to have a temp
41、erature/time performance T/t in relation to adhesion. The diameter of the smallest mandrel where no detachment occurs shall be noted. 4.2.3 Test report The test report for each temperature/time performance designation shall contain the following information: i) A description of the coating and the t
42、ype of base material; ii) the atmosphere used during heat treatment; iii) the temperature/time performance designation; iv) the diameter of the smallest mandrel which does not cause detachment after heating; v) the number of this standard and the relevant clause. 4.3 Tests for interlaminar insulatio
43、n resistance (temperature/time performance designation) 4.3.1 Test specimens Sufficient test specimens of convenient size shall be selected to give a total area enabling 10 readings to be taken using the conventional Franklin test or100electrode readings using the modified Franklin test. Two sets of
44、 such test specimens shall be selected (seeIEC 404-11). 4.3.2 Method of test The first set of test specimens shall be tested at(23 5) C in accordance with either the conventional or the modified Franklin test. For the conventional Franklin test, the mean value of the10readings of insulation resistan
45、ce values shall be calculated and allocated a grade in accordance with column2of Table 1. For the modified Franklin test, based on the values of resistance measured at each electrode, the coating shall be assigned values R 16and R 50such that16% of the resistance values are less than R 16and50% are
46、less than R 50 . The coating shall be assigned a resistance grade as defined in Table 1. Table 1 The other set of test specimens shall be clamped and heated in accordance with one of the methods of clauseA.1 of Annex A. The measurement of interlaminar resistance shall be repeated at ambient temperat
47、ure on the test specimens which have previously been heated. Resistance grade Franklin test resistance 7 mm 2 Modified Franklin test resistance 7 R 16 R 50 A 0,32 10 3 0,1 0,5 B 0,65 10 3 0,2 1,0 C 1,6 10 3 0,5 2,5 D 3,2 10 3 1 5 E 6,5 10 3 2 10 F 16 10 3 5 25 G 32 10 3 10 50BS6404-12:1993 BSI 08-19
48、99 3 For temperatures lower than500 C, the coating will have a temperature/time performance designation T/t if the mean conventional Franklin value has not decreased by more than 30% after heating. Similarly, the coating will have a temperature/time performance designation T/t if each of the values
49、of R 16and R 50from the modified Franklin test has not decreased by more than30% after heating. For temperatures of500 C and above, the coating shall have a temperature/time performance designation T/t if the coating after heating still meets the manufacturers specified cold resistance grade as defined by Table 1. 4.3.3 Test report The test report for each temperature/time performance designation shall contain the following information: i) a description of the coating and the type of ba
