1、BRITISH STANDARD BS CECC 25300:1981 Incorporating Amendment No. 1 Harmonized system of quality assessment for electronic components: Sectional specification: Magnetic oxide cores for power applications UDC 621.3.042.1:621.318.1BSCECC25300:1981 This British Standard, having been prepared under the di
2、rectionof the Electronic Components Standards Committee, was published underthe authority of the Executive Board and comes intoeffect on 31 August 1981 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference ECL/20 Draft for comment 79/23594 DC ISBN 0 580 12
3、252 2 Cooperating organizations The Electronic Components Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: British Electrical and Allied Manufacturers Association (BEAMA) Electricity Supply Industry in England and Wales* E
4、lectronic Components Industry Federation* Electronic Engineering Association* Institution of Electronic and Radio Engineers Ministry of Defence* National Supervising Inspectorate* Post Office* Society of British Aerospace Companies Limited* Telecommunication Engineering and Manufacturing Association
5、 (TEMA)* Trades Union Congress The organizations marked with an asterisk in the above list were directly represented on the Technical Committee entrusted with the preparation of this British Standard. Amendments issued since publication Amd. No. Date of issue Comments 4038 September 1982 Indicated b
6、y a sideline in the marginBSCECC25300:1981 BSI 08-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword iii Text of CECC 25300 1 Publications referred to Inside back coverBSCECC25300:1981 ii BSI 08-1999 National foreword This British Standard has been prepar
7、ed under the direction of the Electronic Components Standards Committee. It is identical with CENELEC Electronic Components Committee (CECC)25300:1980 “Harmonized system of quality assessment for electronic components: Sectional specification: Magnetic oxide cores for power applications”. This stand
8、ard is a harmonized specification within the CECC system. Terminology and conventions. The text of the CECC specification has been accepted as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are used, however, that are not identical with tho
9、se used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Cross-references. The British Standard harmonized with CECC0010
10、0 is BSE9000 “General requirements for electronic components of assessed quality harmonized with the CENELEC Electronic Components Committee System” Part1 “Basic rules”. There are, at present, no corresponding British Standards for IEC205, IEC424, IEC431(and its supplements A and B) and IEC647. The
11、technical committee responsible for this standard has reviewed the provisions of these IEC Standards and has decided that they are acceptable for use in conjunction with this BritishStandard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British
12、Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. International Standard Corresponding British Standard IEC 68 BS 2011 Basic environmental testing procedures IEC 68-2.1:1974 Part 2.1A:1977 Tests A. C
13、old (Identical) IEC 68-2.2:1974 Part 2.1B:1977 Tests B. Dry heat (Identical) IEC 367-1E:1980 BS 5938 Cores for inductors and transformers for telecommunications Part 1:1980 Methods of measurement. National appendix (Identical) CECC 25000:1976 BS CECC 25000:1977 Specification for harmonized system of
14、 quality assessment for electronic components: Generic specification: Inductor and transformer cores for telecommunications (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theCECC title page, pages ii to iv, pages 1 to 8, an inside back cove
15、r and abackcover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BSCECC25300:1981 ii BSI 08-1999 Contents Page Foreword iii Section 1. Scope 1 Section 2. General 1 2.1 Related docum
16、ents 1 2.2 Classification 1 Section 3. Quality assessment procedures 1 Section 4. Additional information 2 Section 5. Blank detail specification 2 5.1 Identification of the harmonized detail specification 2 5.2 Identification of the core 2 5.3 Limiting conditions 3 5.4 Marking of component and packa
17、ge 3 5.4.1 Component 3 5.4.2 Package 3 5.5 Characteristics 3 5.5.1 Visual examination 3 5.5.2 Dimensions 3 5.5.3 Effective parameters 3 5.5.4 Electrical properties 3 5.5.5 Mechanical properties 4 5.6 Certified test records 4 5.7 Additional information 4 5.8 Ordering information 4 5.9 Format of the d
18、etail specification 4 Table 1 Tests for quality assessment inspection 2BSCECC25300:1981 BSI 08-1999 iii Foreword The CENELEC Electronic Components Committee (CECC) is composed of those member countries of the European Committee for Electrotechnical Standardization (CENELEC) who wish to take part in
19、a harmonized System for electronic components of assessed quality. The object of the System is to facilitate international trade by the harmonization of specifications and quality assessment procedures for electronic components, and by the grant of an internationally recognized Mark, or Certificate,
20、 of Conformity. The components produced under the System are thereby accepted by all member countries without further testing. This document has been formally approved by the CECC, and has been prepared for those countries taking part in the System who wish to issue national harmonized specification
21、s for Magnetic oxide cores for power applications. It should be read in conjunction with document CECC00100: Basic Rules (1974). At the date of printing of this document, the member countries of the CECC are Belgium, Denmark, France, Germany, Ireland, Italy, the Netherlands, Norway, Sweden, Switzerl
22、and, and the United Kingdom, and copies of it can be obtained from the addressees shown on the inside cover. Preface This sectional specification was prepared by CECC Working Group12: “Magnetic Components”. It is one of a series of sectional specifications all relating to the generic specification p
23、rinted as CECC25000. In accordance with the requirements of document CECC00100, it is based, wherever possible, on the Recommendations of the International Electrotechnical Commission and in particular on IEC Publication 367: Cores for inductors and transformers for telecommunications. The text of t
24、his sectional specification was circulated to the CECC for voting in document CECC (Secretariat)800in March1979, and following ratification of the Report on the Voting in CECC (Secretariat)870in January1980, was approved by the CECC Management Committee for printing as a CECCSpecification. This docu
25、ment contains the front page and test schedules to be used in preparation of detail specifications. Each test schedule, referenced by a CECCnumber, when taken with the appropriate information in clause 5 of this specification, forms a detail specification.iv blankBSCECC25300:1981 BSI 08-1999 1 Secti
26、on 1. Scope This sectional specification lists the characteristics, ratings and inspection requirements for magnetic cores of assessed quality for power applications and chokes intended for professional and industrial applications, excluding linear and tuned transformers and mains frequency power tr
27、ansformers. It selects from the generic specification CECC25000the appropriate methods of test to be used in detail specifications derived from this specification. Section 2. General 2.1 Related documents IEC 68, Basic environmental testing procedures (see CECC 00006). IEC 68-2-1:1974, Tests A: Cold
28、. IEC 68-2-2:1974, Tests B: Dry heat. IEC 205:1966, Calculation of the effective parameters of magnetic piece parts. IEC 424:1973, Guide to the specification of limits for physical imperfections of parts made from magnetic oxides. IEC 431:1973, Dimensions of square cores (RM cores) made of magnetic
29、oxides and associated parts. IEC 431A:1976, First supplement. IEC 431B:1978, Second supplement. IEC 367-1E:1980, 5th Supplement to IEC 367-1:1971: Cores for inductors and transformers for telecommunications Part1: Measuring methods. IEC 647:1979, Dimensions for magnetic oxide cores intended for use
30、in power supplies (EC-cores). CECC 25000:1976, Generic specification: Inductor and transformer cores for telecommunications. 2.2 Classification A core is classified by: shape: for example U core, E core, EC core, RM core, . size: for example: 55 28 21, EC 41, RM 14, . class (combined electromagnetic
31、 properties): since no systematic classification of the lectromagnetic properties is available in CECC, each detail specification shall clearly define the class or material grade to which it applies. It may also state the appropriate class designation. Normally, a detail specification will cover cor
32、es of one shape, size and class. Section 3. Quality assessment procedures The tests given in Table 1 shall be included in each detail specification for magnetic oxide power transformer cores. These tests shall be carried out in accordance with the measuring methods presented in Section4 of CECC25000
33、 or as listed in2.1. Visual examination and measurement of dimensions may be carried out on half cores, all other tests being carried out on a set. Amplitude permeability or flux density and total (power) loss shall be measured on ungapped cores.BSCECC25300:1981 2 BSI 08-1999 Table 1 Tests for quali
34、ty assessment inspection Section 4. Additional information Additional information in the form of curves and graphs may be given by the manufacturer. This should not be used for inspection purposes and is supplied for information only. Section 5. Blank detail specification The following information a
35、nd requirements shall be prescribed in each detail specification together with the required values. The numbers between square brackets on page 5 correspond to the following indications which should be given. The general data necessary to identify the harmonized detail specification and the componen
36、t shall preferably be presented as shown in5.9. 5.1 Identification of the harmonized detail specification 5.2 Identification of the core Group Test Inspection level AQL % A Lot-by-lot Visual examination Marking I 1,5 Dimensions Primary I 1,0 Secondary S3 4,0 B Lot-by-lot Inductance factor or air gap
37、 S3 4,0 Amplitude permeability 4 aor Flux density a S3 4,0 Total (power) loss S3 4,0 C Periodic on one delivery batch Superimposed direct current a 5 sets 1 defective permitted every 12 months Compression load test 15 cores 1 defective permitted every 12 months a This sub-group may be omitted from t
38、he detail specification when not relevant. The name of the National Standards Organization under whose authority the detail specification is drafted 1 The CECC Symbol and the number allotted to the national detail specification by the CECC General Secretariat 2 The number and issue number of the nat
39、ional generic and sectional specifications 3 The national number of the detail specification, date of issue and any further information required by the national System, together with any amendment numbers, if issued. 4 Magnetic core intended for power applications class: 5 Typical construction (core
40、 shape and size) 6 Outline drawing and dimensions (cf. 5.5.2) 7 Application or group of applications covered by the detail specification 8B eBSCECC25300:1981 BSI 08-1999 3 5.3 Limiting conditions (not for inspection purposes) Limiting values of temperature shall preferably be chosen from IEC68-2-1 a
41、nd IEC68-2-2. For example: “the temperature range for amplitude permeability shall be from 10 C to + 100 C.” Any interdependance of these conditions shall also be stated. Limiting values of temperature shall preferably be chosen from IEC68-2-1 and IEC68-2-2. For example: “the temperature range shall
42、 be from 55 C to +100 C”. 5.4 Marking of component and package 5.4.1 Component (minimum information) 1) Class or grade of material (may be in coded form) Manufacturers component designation where physically possible 5.4.2 Package (minimum information in the following sequence) Detail specification n
43、umber Manufacturers component designation and name of manufacturer or ideogram Manufacturers batch identification code Quantity A Lor air gap (if relevant) 5.5 Characteristics 5.5.1 Visual examination The condition, workmanship and finish shall be satisfactory as determined by visual examination. Th
44、e acceptance of any physical imperfections shall be judged on the basis of IEC424. The permissible percentage of chipping shall be stated in the detail specification. The marking shall be clearly legible as determined by visual examination. 5.5.2 Dimensions Primary dimensions: i.e.those dimensions c
45、ontrolled by the gauge(s) defined in the appropriate IEC Publication, for example, for EC cores: IEC647. In the case where the dimensions of the cores are not defined in an IEC Publication, primary dimensions are those dimensions that are essential in the application. The remaining dimensions are se
46、condary dimensions. Secondary dimensions: i.e.those dimensions shown in the appropriate IEC Publication but not controlled by the gauge(s). 5.5.3 Effective parameters 5.5.4 Electrical properties Specify clamping force and test coils for electrical measurements. 1) Inductance factor A L Operating con
47、ditions: maximum temperature; other requirements for mechanical and environmental conditions in which the component is to operate shall be stated in terms of limits of the relevant characteristics. Storage conditions: temperature range; other requirements for mechanical and environmental conditions
48、in which the component is to be stored, shall be stated in terms of limits of the relevant characteristics. 1) Cores supplied as matched sets can be marked only on one half-core. At least two of the effective parameters e.g.A e , l e ; the values of these shall be calculated in accordance with IEC20
49、5. In addition A minif the cross section is significantly non uniform. 9BSCECC25300:1981 4 BSI 08-1999 Test in accordance with the requirements of 4.3, 4.5 and 4.6 of CECC25000 Specify Specify F 1and f. 2) Amplitude permeability 4 afor flux density Test in accordance with the requirements of 4.17 of CECC25000 3) Effective total (power) loss Test in accordance with the requirements of 4.16 of CECC25000 Specify f, B, F 1and F 2 . 4) Superimposed direct current Test in accordance with the requirements of clause 1
