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1、BRITISH STANDARD BS 9727:1985 Sectional specification for power transformers of assessed quality for use in electronic equipment for capability approval UDC 621.314.2 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:34 GMT+00:00 2006, Uncontrolled Copy, (c)
2、 BSI BS 9727:1985 This British Standard, having been prepared under the direction of the Electronic Components Standards Committee, was published under the authority of the Board of BSI and comes into effect on 29 November 1985 BSI 01-2000 First published April 1978 First revision November 1985 The
3、following BSI references relate to the work on this standard: Committee reference ECL/18 Draft for comment 84/29484 DC ISBN 0 580 14685 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Components Standards Committee (ECL/-) t
4、o Technical Committee ECL/18, upon which the following bodies were represented: Beama Transmission and Distribution Association Electronic Components Industry Federation Electronic Engineering Association Engineering Equipment and Materials Users Association Ministry of Defence National Supervising
5、Inspectorate Society of British Aerospace Companies Limited Telecommunications Engineering and Manufacturing Association (TEMA) United Kingdom Atomic Energy Authority Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank Univ
6、ersity, Fri Dec 08 02:21:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9727:1985 BSI 01-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Related documents1 3Preparation of the detail specification1 4Inspection requirements to be listed in the detail specification2
7、5Detail specification2 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9727:1985 ii BSI 01-2000 Foreword This revised British Standard has been prepared under the direction of the Electronic Components Stand
8、ards Committee. It is intended to be used for the preparation of detail specifications for power transformers released under the terms of the BS 9000/BS 9720 capability approval procedure. In this edition the format of the blank detail specification has been simplified and the recommended test sched
9、ule modified, to accord with the experience gained in operating the procedure since the first edition, and clear guidance is given on the suitable test inspection levels. Changes brought about by the revision of BS 9720 are also incorporated where appropriate. As an assessment level for the document
10、 is now inappropriate, this standard supersedes both BS 9727:1978 and BS 9728:1978, which are withdrawn. It is intended for use by the following originators. a) A customer wishing to procure power transformers that are within the scope of the approved capability of his supplying component manufactur
11、er, e.g. for customers detail specifications (CDSs). b) A capability approved manufacturer of power transformers wishing to prepare specifications for his own products which are within the scope of his capability approval. A British Standard does not purport to include all the necessary provisions o
12、f 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. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 8 and a back
13、 cover. 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. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:34 GMT+00:00 2006, Uncontrolled C
14、opy, (c) BSI BS 9727:1985 BSI 01-20001 1 Scope This British Standard specifies inspection requirements and tests from which a selection is made when preparing a detail specification for power transformers to be released under the terms of BS 9720 capability approval. It includes a blank detail speci
15、fication (BDS), which shows the format, and indicates which tests are considered to be appropriate to this type of component, although the final selection of tests to be included in the inspection schedule is at the discretion of the specification writer. It also lists appropriate ratings and charac
16、teristics. The components covered by this standard are concerned with the maximum transfer of power at a single frequency with an essentially symmetrical waveform. 2 Related documents BS 2011, Basic environmental testing procedures. BS 6001, Sampling procedures and tables for inspection by attribute
17、s. BS 9000, General requirements for a system for electronic components of assessed quality. BS 9720, Specification for custom-built transformers and inductors of assessed quality: generic data and methods of test. PD 9002, BS 9000 and BS CECC qualified products list. NOTEBS 6001 and BS 9720 should
18、be available for reference when preparing detail specifications. 3 Preparation of the detail specification 3.1 General A detail specification shall be prepared in accordance with 2.6.1 of BS 9720:1983. NOTE 1The detail specification should take the form of the BDS shown in clause 5, particularly in
19、respect of the front page format and, in principle, in respect of the presentation of the inspection requirements. NOTE 2All the tests shown in the BDS are taken from BS 9720. Those shown in bold type concern operating characteristics of fundamental importance and it is strongly recommended that the
20、se are selected by the specification writer for inclusion in the detail specification. The tests shown in plain type are listed for the convenience of the specification writer, and tests should be selected from them according to the particular application of the component. NOTE 3Over-specification m
21、ay carry an economic penalty. However, the specification writer may specify tests and sampling levels different from, less than, or additional to those given in the BDS. 3.2 Particular requirements 3.2.1 Where additional tests of a type not defined or invoked in BS 9720 are required, these shall be
22、fully specified in the detail specification. 3.2.2 Any tests considered as being destructive shall be so denoted in the test schedule by the addition of the notation “(D)”. NOTEThe use of this notation is not illustrated in the BDS. 3.2.3 Tests shall be grouped in the schedule according to the level
23、 of sampling required and, where indicated see 4.1 b), in the order of testing required. Where 100 % testing is not required, inspection levels and acceptable quality levels shall be selected from BS 6001. 3.2.4 The completed detail specification shall be allocated a component identity number and is
24、sue status by the originator. NOTE 1This number is chosen by the originator (manufacturer or customer) within his own system. It is thus not subject to any external rules or codification. NOTE 2In the special case of a manufacturers detail specification for a standard catalogue item which the manufa
25、cturer wishes to be listed in PD 9002, BSI will allocate an appropriate number in accordance with 15.11 of BS 9000-1:1981. 3.2.5 Additionally the detail specification shall include a number allocated by the component manufacturer comprising this specification number, his factory identification code
26、letters and a unique number within his registration system, e.g. BS 9727/XYZ/1234. NOTEAfter a detail specification has been allocated the manufacturers reference number in accordance with 3.2.5, it is to be considered a contractual part of an order. Copies of all such detail specifications are to b
27、e retained by the manufacturers chief inspector. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9727:1985 2 BSI 01-2000 3.3 Ratings and characteristics 3.3.1 Ratings. In the case of customer originated deta
28、il specifications, customer and manufacturer agreement shall be obtained on the ratings to be ascribed to the component in the detail specification. These ratings shall not exceed the scope of the manufacturers capability approval (see also 1.1.12 of BS 9720:1983). 3.3.2 Characteristics. A customer
29、shall prescribe in the detail specification any characteristic required for a component. 3.4 Outline drawings and winding schematic diagram 3.4.1 The detail specification shall incorporate a drawing of the transformer showing important features, such as those dimensions affecting interchangeability,
30、 restrictions on mounting and marking requirements. 3.4.2 The detail specification shall incorporate a schematic diagram showing all windings, screens, taps and phasings and giving termination identification. 3.4.3 Where the transformer is intended to be connected to a circuit supplying direct curre
31、nt, full details of this circuit shall be given together with load and component values. 4 Inspection requirements to be listed in the detail specification 4.1 Conformance inspection The detail specification shall incorporate the following notes. a) Sampling inspection is to be carried out in accord
32、ance with BS 6001, normal inspection. b) Tests in a group may be carried out in any order except where otherwise indicated (see 3.2.3). c) Components submitted to any tests marked (D) may not be released under BS 9720 capability approval. (D = destructive). d) The values given for measurement limits
33、 are absolute values: measurement uncertainty is to be taken into account. 4.2 Design verification The tests to be detailed under this heading are those which the specification writer considers to be inappropriate to lot-by-lot release, but appropriate to the verification of new and original designs
34、. Accordingly, they are to be performed only when specifically so stated in the order, and the detail specification shall carry a statement to this effect. If design verification is required, the number of specimens and that there shall be no failures shall be stated in the detail specification. NOT
35、ETwo specimens will normally be required. 5 Detail specification The BDS which follows, when completed in accordance with clause 3, forms the relevant detail specification. NOTEThe front page of the BDS has been based upon the need for a customers detail specification. Where a manufacturers detail s
36、pecification is required, some changes will be necessary, but the basic format should be retained. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9727:1985 BSI 01-20003 Blank detail specificationSheet 1 (of
37、 6) Originators component identity number Specification available from:SPECIFICATION ISSUE STATUS DATE ELECTRONIC COMPONENTS OF ASSESSED QUALITY MANUFACTURER(S) REFERENCE NUMBERS SEE NOTES 1 AND 2 BELOWa DETAIL SPECIFICATION IN ACCORDANCE WITH BS 9727:1985 POWER TRANSFORMER BRIEF TECHNICAL DESCRIPTI
38、ON For detail dimensions and schematic diagram see sheet 7 NOTE 1It may be possible to procure this component from any manufacturer holding a current BS 9720 Capability Approval Certificate (listed in PD 9002) for such wound components defined herein, i.e. where this component falls within the manuf
39、acturer(s) approved limits. NOTE 2Current Approved Manufacturers are:a ManufacturerCapability Approval No.Manufacturers Ref. No. BS 9727/XYZ/1234 a The listing of manufacturers in a copy of this document issued by a potential customer is at the customers discretion. Licensed Copy: London South Bank
40、University, London South Bank University, Fri Dec 08 02:21:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9727:1985 4 BSI 01-2000 Blank detail specificationSheet 2 (of 6) Originators component identity number Power transformer to BS 9727:1985ISSUE STATUS Ratings and characteristics (see 3.3 of BS
41、9727:1985) DATE Climatic category Maximum temperature range Mass Vibration (see BS 2011-2.1 Fc) Bump (see BS 2011-2.1 Eb) Shock (see BS 2011-2.1 Ea) Solderability (see BS 2011-2.1 Ta) Robustness of terminations (see BS 2011-2.1 Ua, Ub, Uc or Ud as appropriate) Rapid change of temperature (see BS 201
42、1-2.1 Na) Input voltage(s) Input frequency Input voltage variation on any primary tapping Output winding1234 Vr.m.s Ir.m.s Peak working voltage Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9727:1985 BSI 0
43、1-20005 Blank detail specificationSheet 3 (of 6) Originators component identity number Power transformer to BS 9727:1985ISSUE STATUS Inspection requirements (see notes)DATE TEST ILAQLBS 9720:1983 Reference Performance requirements and conditions of test DESIGN VERIFICATION ONLY: 2 specimens, no fail
44、ures (see 4.2 of BS 9727:1985). Design verification inspection comprises those tests listed below plus all those selected for conformance inspection. Design verification tests shall only be performed when specifically invoked by the relevant order. Insulation resistance (hot) As required1.2.4.2.2 Te
45、mperature riseAs required1.2.4.22 Maximum surface temperature As required1.2.4.28 Endurance (short term) As required1.2.7.1 Voltage regulation (full load) As required1.2.4.23Maximum regulation - % Full load voltage tolerance - % IN PROCESS INSPECTION: To be conducted during manufacture if an isolati
46、ng screen is specified Isolating screen100 %1.2.4.8.2 1.2.2.2 Isolating screen position S41 %1.2.2.1 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9727:1985 6 BSI 01-2000 Blank detail specificationSheet 4
47、(or 6) Originators component identity number Power transformer to BS 9727:1985ISSUE STATUS Inspection requirements (see notes)DATE TEST ILAQLBS 9720:1983 Reference Performance requirements and conditions of test TESTS ON COMPLETED COMPONENTS Visual inspection100 %1.2.2 Dimensions100 %1.2.3 Voltage t
48、ransformation ratio (no-load volts) 100 %1.2.4.16 Procedure 1 No-load current100 %1.2.4.3.1 Induceda high voltage 100 %1.2.4.5Test voltage and frequency, including tolerances, to be specified. D.C. winding resistance 100 %1.2.4.1.1 Voltage proof100 %1.2.4.4 Insulationb resistance (Standard atmospher
49、e) 100 %1.2.4.2.1 Electrostatic screens (if fitted) 100 %1.2.4.8.1 Phase test100 %1.2.4.26 Acoustic noise100 %1.2.4.25 Magnetic radiation100 %1.2.4.24 Voltage unbalance100 %1.2.4.12 a This test should be performed after the no-load current test. b This test should be performed after the voltage-proof test. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9727:1985 BSI 01-20007 Blank detail specificationSheet 5 (of 6) Originators component identity number Power tr
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