1、BRITISH STANDARD BS 9727:1985 Sectional specification for power transformers of assessed quality for use in electronic equipment for capability approval UDC 621.314.2BS9727:1985 This British Standard, having been prepared under the directionof the Electronic Components Standards Committee, was publi
2、shed underthe authority of the BoardofBSI and comes into effect on 29November1985 BSI 01-2000 First published April1978 First revision November1985 The following BSI references relate to the work on this standard: Committee referenceECL/18 Draft for comment84/29484DC ISBN 0 580 14685 5 Committees re
3、sponsible for this BritishStandard The preparation of this British Standard was entrusted by the Electronic Components Standards Committee (ECL/-) to Technical Committee ECL/18, upon which the following bodies were represented: Beama Transmission and Distribution Association Electronic Components In
4、dustry Federation Electronic Engineering Association Engineering Equipment and Materials Users Association Ministry of Defence National Supervising Inspectorate Society of British Aerospace Companies Limited Telecommunications Engineering and Manufacturing Association (TEMA) United Kingdom Atomic En
5、ergy Authority Amendments issued since publication Amd. No. Date of issue CommentsBS9727:1985 BSI 01-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Related documents 1 3 Preparation of the detail specification 1 4 Inspection requirements to be listed in the de
6、tail specification 2 5 Detail specification 2BS9727:1985 ii BSI 01-2000 Foreword This revised British Standard has been prepared under the direction of the Electronic Components Standards Committee. It is intended to be used for the preparation of detail specifications for power transformers release
7、d under the terms of the BS9000/BS9720 capability approval procedure. In this edition the format of the blank detail specification has been simplified and the recommended test schedule modified, to accord with the experience gained in operating the procedure since the first edition, and clear guidan
8、ce is given on the suitable test inspection levels. Changes brought about by the revision of BS9720 are also incorporated where appropriate. As an assessment level for the document is now inappropriate, this standard supersedes both BS9727:1978 and BS9728:1978, which are withdrawn. It is intended fo
9、r 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 manufacturer,e.g.for customers detail specifications (CDSs). b) A capability approved manufacturer of power transformers wishing to
10、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 of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard d
11、oes 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, pages1 to 8 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated
12、in the amendment table on the inside front cover.BS9727:1985 BSI 01-2000 1 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 BS9720 capability approva
13、l. It includes a blank detail specification (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 l
14、ists appropriate ratings and characteristics. 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
15、 tables for inspection by attributes. 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, BS9000 and BS CECC qualified products lis
16、t. NOTEBS6001 and BS9720 should 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 with2.6.1 of BS9720:1983. NOTE1The detail specification should take the form of the BDS shown
17、in clause5, particularly in 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 BS9720. Those shown in bold type concern operating characteristics of fundamental importance and it is st
18、rongly recommended that these 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.
19、 NOTE 3Over-specification may 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 BS9720 are
20、 required, these shall be 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 sched
21、ule according to the level of sampling required and, where indicated see4.1 b), in the order of testing required. Where100% testing is not required, inspection levels and acceptable quality levels shall be selected from BS6001. 3.2.4 The completed detail specification shall be allocated a component
22、identity number and issue 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
23、 item which the manufacturer wishes to be listed in PD9002, BSI will allocate an appropriate number in accordance with15.11 of BS9000-1:1981. 3.2.5 Additionally the detail specification shall include a number allocated by the component manufacturer comprising this specification number, his factory i
24、dentification code letters and a unique number within his registration system,e.g.BS9727/XYZ/1234. NOTEAfter a detail specification has been allocated the manufacturers reference number in accordance with3.2.5, it is to be considered a contractual part of an order. Copies of all such detail specific
25、ations are to be retained by the manufacturers chief inspector.BS9727:1985 2 BSI 01-2000 3.3 Ratings and characteristics 3.3.1 Ratings. In the case of customer originated detail specifications, customer and manufacturer agreement shall be obtained on the ratings to be ascribed to the component in th
26、e detail specification. These ratings shall not exceed the scope of the manufacturers capability approval (seealso1.1.12 of BS9720:1983). 3.3.2 Characteristics. A customer shall prescribe in the detail specification any characteristic required for a component. 3.4 Outline drawings and winding schema
27、tic diagram 3.4.1 The detail specification shall incorporate a drawing of the transformer showing important features, such as those dimensions affecting interchangeability, restrictions on mounting and marking requirements. 3.4.2 The detail specification shall incorporate a schematic diagram showing
28、 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 current, full details of this circuit shall be given together with load and component values. 4 Inspection requirements to be listed
29、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 accordance with BS6001, normal inspection. b) Tests in a group may be carried out in any order except where otherwise indicated (see3.
30、2.3). c) Components submitted to any tests marked (D) may not be released under BS9720 capability approval. (D=destructive). d) The values given for measurement limits are absolute values: measurement uncertainty is to be taken into account. 4.2 Design verification The tests to be detailed under thi
31、s 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. Accordingly, they are to be performed only when specifically so stated in the order, and the detail specification shall carry a sta
32、tement 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. NOTETwo specimens will normally be required. 5 Detail specification The BDS which follows, when completed in accordance with clause3, fo
33、rms 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 specification is required, some changes will be necessary, but the basic format should be retained.BS9727:1985 BSI 01-2000 3 Blank deta
34、il specification Sheet 1 (of 6) Originators component identity number Specification available from: SPECIFICATION ISSUE STATUS DATE ELECTRONIC COMPONENTS OF ASSESSED QUALITY MANUFACTURER(S) REFERENCE NUMBERS SEE NOTES1 AND2 BELOW a DETAIL SPECIFICATION IN ACCORDANCE WITH BS9727:1985 POWER TRANSFORME
35、R BRIEF TECHNICAL DESCRIPTION For detail dimensions and schematic diagram see sheet7 NOTE 1It may be possible to procure this component from any manufacturer holding a current BS9720 Capability Approval Certificate (listed in PD9002) for such wound components defined herein, i.e.where this component
36、 falls within the manufacturer(s) approved limits. NOTE2Current Approved Manufacturers are: a Manufacturer Capability Approval No. Manufacturers Ref. No. BS9727/XYZ/1234 a The listing of manufacturers in a copy of this document issued by a potential customer is at the customers discretion.BS9727:198
37、5 4 BSI 01-2000 Blank detail specification Sheet 2 (of 6) Originators component identity number Power transformer to BS9727:1985 ISSUE STATUS Ratings and characteristics (see3.3 of BS9727:1985) DATE Climatic category Maximum temperature range Mass Vibration (see BS2011-2.1Fc) Bump (see BS2011-2.1Eb)
38、 Shock (see BS2011-2.1Ea) Solderability (see BS2011-2.1Ta) Robustness of terminations (see BS2011-2.1 Ua, Ub, Uc or Ud as appropriate) Rapid change of temperature (see BS2011-2.1Na) Input voltage(s) Input frequency Input voltage variation on any primary tapping Output winding 1 2 3 4 V r.m.s I r.m.s
39、 Peak working voltageBS9727:1985 BSI 01-2000 5 Blank detail specification Sheet 3 (of 6) Originators component identity number Power transformer to BS 9727:1985 ISSUE STATUS Inspection requirements (see notes) DATE TEST IL AQL BS 9720:1983 Reference Performance requirements and conditions of test DE
40、SIGN VERIFICATION ONLY: 2 specimens, no failures (see4.2 of BS9727:1985). 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. Insulatio
41、n resistance (hot) As required 1.2.4.2.2 Temperature rise As required 1.2.4.22 Maximum surface temperature As required 1.2.4.28 Endurance (shortterm) As required 1.2.7.1 Voltage regulation (full load) As required 1.2.4.23 Maximum regulation-% Full load voltage tolerance-% IN PROCESS INSPECTION: To b
42、e conducted during manufacture if an isolating screen is specified Isolating screen 100% 1.2.4.8.2 1.2.2.2 Isolating screen position S4 1% 1.2.2.1BS9727:1985 6 BSI 01-2000 Blank detail specification Sheet 4 (or 6) Originators component identity number Power transformer to BS 9727:1985 ISSUE STATUS I
43、nspection requirements (see notes) DATE TEST IL AQL BS 9720:1983 Reference Performance requirements and conditions of test TESTS ON COMPLETED COMPONENTS Visual inspection 100% 1.2.2 Dimensions 100% 1.2.3 Voltage transformation ratio (no-load volts) 100% 1.2.4.16 Procedure1 No-load current 100% 1.2.4
44、.3.1 Induced ahigh voltage 100% 1.2.4.5 Test voltage and frequency, including tolerances, to be specified. D.C. winding resistance 100% 1.2.4.1.1 Voltage proof 100% 1.2.4.4 Insulation bresistance (Standard atmosphere) 100% 1.2.4.2.1 Electrostatic screens (if fitted) 100% 1.2.4.8.1 Phase test 100% 1.
45、2.4.26 Acoustic noise 100% 1.2.4.25 Magnetic radiation 100% 1.2.4.24 Voltage unbalance 100% 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.BS9727:1985 BSI 01-2000 7 Blank detail specification Sheet 5 (of 6) Origin
46、ators component identity number Power transformer to BS 9727:1985 ISSUE STATUS Inspection requirements (see notes) DATE TEST IL AQL BS 9720:1983 Reference Performance requirements and conditions of test TESTS ON COMPLETED COMPONENTS (continued) No-load loss S4 1% 1.2.4.3.2 Magnetic shielding S4 1% 1
47、.2.4.6.1 Insulation resistance (hot) S3 1.5% 1.2.4.2.2 Leakage inductance S3 1.5% 1.2.4.14 Magnetic influence S2 2.5% 1.2.4.6.2 Insert additional tests as required: NOTE 1Sampling inspection is to be carried out in accordance with BS6001, normal inspection. NOTE 2Tests in a group may be carried out
48、in any order except where otherwise indicated (see3.2.3 of BS9727:1985). NOTE 3Components submitted to any tests marked (D) may not be released under BS9720 capability approval. NOTE 4The values given for measurement limits are absolute values: measurement uncertainty is to be taken into account.BS9
49、727:1985 8 BSI 01-2000 Blank detail specification Sheet 6 (of 6) Originators component identity number Power transformer to BS9727:1985 ISSUE STATUS OUTLINE DRAWING AND SCHEMATIC DATE Drawing in accordance with BS308 Third angle projection Dimensions in mm Drawing: (see3.4.1 of BS9727:1985) Marking: component identity no. including specification issue status; factory identity code as a minimum; position to be indicated (see also1.1.6 of BS9720:1983) Schematic diagram: (see3.4.2 and3.4.3 of BS9727:1985) blankBS 9727:1985 BSI 389 Chiswick High Road
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