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1、BRITISH STANDARD BS 9734:1978 Sectional specification for pulse transformers of assessed quality for use in electronic equipment: full assessment level UDC 621.314.2 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c)
2、BSI BS 9734:1978 This British Standard, having been prepared under the direction of the Electronic Components Standards Committee, was published under the authority of the Executive Board on 30 November 1978 BSI 02-2000 The following BSI references relate to the work on this standard: Committee refe
3、rence ECL/11 Draft for comment 75/23844 DC ISBN 0 580 10423 0 Cooperating organizations The Electronic Components Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organiza
4、tions: British Electrical and Allied Manufacturers Association (BEAMA) Electricity Supply Industry in England and Wales* Electronic Components Industry Federation* Electronic Engineering Association* Institution of Electronic and Radio Engineers Ministry of Defence* National Supervising Inspectorate
5、* Post Office* Society of British Aerospace Companies Limited* Telecommunication Engineering and Manufacturing Association (TEMA)* Trades Union Congress The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with
6、 the preparation of this British Standard: Engineering Equipment Users Association The Transmission and Distribution Association (BEAMA) United Kingdom Atomic Energy Authority Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South
7、Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9734:1978 BSI 02-2000i Contents Page Cooperating organizationsInside front cover Forewordii 1Scope1 2General requirements1 3Related documents1 4Ratings and characteristics1 5Inspection requirements1 6Instructions for
8、the completion of the customers detail specification3 Appendix A Customers detail specification (blank)4 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9734:1978 ii BSI 02-2000 Foreword This standard specif
9、ies the inspection requirements for transformers released under the BS 9720 capability approval scheme. Attention is drawn to the foreword to BS 9720, in which the use of this document is described in the following terms. a) A potential customer makes an enquiry to the manufacturer for a component w
10、ithin the scope of capability published in PD 9002. b) The specification is negotiated between the manufacturer and the customer until an agreed customers detail specification (based on the blank attached to this document) is finalized. c) The component is inspected and released in accordance with c
11、lause 5 of this specification, as described in the customers detail specification. This standard may be used to enlarge upon the specifications (BS 9721, BS 9722, BS 9727 and BS 9728) for signal and power transformers where they are not sufficient in their own right even though the waveform may appr
12、oach that which is appropriate to these specifications. 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 lega
13、l 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 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
14、 cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9734:1978 BSI 02-20001 1 Scope This British Standard specifies the inspection requirements for pulse transformers for use in electronic equipment, at t
15、he full assessment level, released under the BS 9000 capability approval scheme. For the purposes of this standard a pulse transformer is a component that is essentially concerned with unidirectional pulses and the transfer of the energy and signals of these pulses from one section of a circuit to a
16、nother. Whilst no specific dividing line is practicable, low power pulse transformers are regarded as transferring information and high power pulse transformers are regarded as transferring power. This standard includes a typical format for a customers detail specification (blank). The specification
17、 should be completed and agreed between the manufacturer and the customer in accordance with 2.6.1 of BS 9720. 2 General requirements When a customer requires a pulse transformer that falls within the scope of a manufacturers capability approval, a customers detail specification shall be prepared. T
18、he completed specification will be given an identity by the manufacturer only after its contents have been agreed by the customer, and it will then be considered a contractual part of the order. Copies of all agreed customers detail specifications shall be retained by the manufacturers approved Chie
19、f Inspector. 3 Related documents BS 6001, Sampling procedures and tables for inspection by attributes. BS 9000, General requirements for electronic components of assessed quality. BS 9720, Custom-built transformers and inductors of assessed quality: generic data and methods of test. 4 Ratings and ch
20、aracteristics 4.1 The customer and the manufacturer shall agree on the ratings and characteristics included in the customers detail specification. Instructions are given in the customer detail specification (blank) for the completion of mandatory and optional requirements. 4.2 For those ratings and
21、characteristics that are listed in 1.1.12 of BS 9720:1976, values shall preferably be selected from those given. 5 Inspection requirements 5.1 Pulse transformers for use in electronic equipment and released under the BS 9720 capability approval scheme shall be subjected to the tests listed in the fo
22、llowing schedule. Tests marked with an asterisk (*) shall be performed only if the completed customers detail specification states that they are needed. 5.2 Tests shown in bold type are mandatory. 5.3 Where a subgroup contains more than one test, the tests shall be carried out in the order specified
23、 in the following schedule. 5.4 Specimens submitted to tests marked (D) shall not be accepted for release under BS 9000 (see 2.6.5 of BS 9000-1). Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9734:1978 2 B
24、SI 02-2000 Inspection BS 9720 reference and conditions of test Requirement GROUP A To be applied on a sampling basis lot-by-lot, excepting subgroup A0 Subgroup A0100 % inspection Visual inspection1.2.2As 1.2.2 Dimensions1.2.3 Voltage proof1.2.4.4As specified See customers detail specification Induce
25、d high voltage1.2.4.5 Voltage transformation ratio1.2.4.16 Pulse characteristics1.2.4.20The parameters specified *Polarity1.2.4.26 See customers detail specification *Inductance and a.c. resistance1.2.4.7As specified *Acoustic noise1.2.4.25 Subgroup A1Inspection level S4, AQL 1 % *Insulation resista
26、nce (standard atmosphere) 1.2.4.2.1 As specified See customers detail specification *Self-capacitance1.2.4.15.1 *Leakage inductance1.2.4.14 *Q factor1.2.4.9 *Impedance unbalance1.2.4.11 *Capacitance unbalance1.2.4.10 *Voltage unbalance1.2.4.12 *Resistance unbalance1.2.4.13 Subgroup A2Inspection leve
27、l S3, AQL 1.5 % *DC winding resistance1.2.4.1.1 AS specified See customers detail specification *Insulation resistance (hot)1.2.4.2.2 *Electrostatic screen (s)1.2.4.8.1 Subgroup A4Inspection level S1, AQL 4 % *Magnetic shielding1.2.4.6.1 As specified See customers detail specification *Magnetic radi
28、ation1.2.4.24 *No load current1.2.4.3.1 *Interwinding capacitance1.2.4.15.2 *Endurance short term1.2.7.1 GROUP C To be applied on a sampling basis at three-monthly intervals Subgroup C4Inspection level S2, AQL 2.5 % *Temperature rise1.2.4.22 As specified See customers detail specification Isolating
29、screen(s) (D)a1.2.4.8.2 a This test is mandatory if isolating screens are fitted. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9734:1978 BSI 02-20003 6 Instructions for the completion of customers detail
30、specification 6.1 Outline dimensions. In making the initial enquiry, the customer shall specify outline dimensions as far as is necessary by attaching to the customers detail specification a dimensioned sketch or drawing. Before the customers detail specification is allocated an identity, an agreed
31、drawing shall be included to show the dimensions that are essential for fixing and interchangeability. The drawing need not include full details of any aspect of the outline that is not critical or essential. 6.2 Fundamental information. The information required by the customers detail specification
32、 (blank) shall be provided before the detail specification is allocated an identity. In most cases this information will be provided by the customer at the enquiry stage as a basis for the manufacturers design process, but some items may need to be completed after consultation between the customer a
33、nd the manufacturer. It is possible for the customer to prescribe additional characteristics when completing the detail specification. 6.3 Test information. The agreed customers detail specification shall specify which of the test requirements in the appendix to this specification are applicable, by
34、 suitable deletion in the third column and the addition of relevant limits and conditions in the appropriate columns of tests called up in the customers detail specification. The inspection shall be at the inspection level and AQL given in clause 5 of this specification. It is possible for the custo
35、mer to prescribe additional tests, and/or tests at higher inspection levels or tighter AQLs in accordance with 1.3 (10) of BS 9000-1. If this option is exercised, the assessment will be at the full plus additional assessment level. The customer is reminded of the possible economic penalty of includi
36、ng unnecessary tests or of specifying unnecessarily tight limits. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9734:1978 4 BSI 02-2000 Appendix A Customers detail specificationManufacturers unique identif
37、ication Low power or data pulse transformer 1. Fundamental information Component description Name of manufacturer and capability approval number Name of customer Customers reference number (to be completed if necessary) Manufacturer(s) reference number(s) (See 6.1) Assessment level Additional inform
38、ation (if required) 2. Ratings and characteristicsa Environmental category Input winding First output winding Second output winding Third output winding Fourth output winding Peak working volts Pulse amplitude Source load impedances Voltage transformation ratios Screen requirements Polarity requirem
39、ents Pulse decay time Pulse duration Pulse rise time P.R.F. NOTE 1Tolerances shall be added where applicable. NOTE 2See also 6.2 for additional characteristics. NOTE 3If required, a sample, tested to the non-destructive requirements of clause 5 of this specification, shall be supplied to the custome
40、r. NOTE 4See also 2.6.1 of BS 9720. a Insert an asterisk when any category not applicable. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9734:1978 BSI 02-20005 3. Customers test requirementsManufacturers u
41、nique identification Title of testBS 9720 referenceIs test needed? Required limit(s)Conditions of test Gen.I/PO/P1 O/P2 O/P3 O/P4Gen.I/PO/P1 O/P2 O/P3 O/P4 Dimensions1.2.3YesSee drawing and 6.1See drawing and 6.1 Voltage proof1.2.4.4Yes aaaaaa Test duration aaaaa Frequency/if other than 48 Hz to 62
42、Hz aaaaa Induced high voltage1.2.4.5Yes aaaaaa Test duration Connected winding a Pulse duration aaaaa Load pulse PRF aaaaa Test voltage aaaaa Voltage transformation ratio 1.2.4.16Yes a Alternating voltage level a Measuring frequency a Pulse characteristics1.2.4.20Yes a Input pulse amplitude a Rise t
43、ime a Decay time a Droop a PRF a Load impedance a Pulse duration a Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9734:1978 6 BSI 02-2000 Manufacturers unique identification Title of test BS 9720 reference
44、Is test needed? Required limit(s)Conditions of test Gen. I/P O/P1 O/P2 O/P3 O/P4Gen.I/PO/P1O/P2O/P3O/P4 Polarity1.2.4.26Yes/No aaaaaa Connected termination a Inductance and a.c. resistance 1.2.4.7Yes/No a Form of measurement a Frequency (ies) a Voltage level a Polarizing currents Acoustic noise1.2.4
45、.25Yes/No aaaaa Voltage level aaaaaa Pulse duration aaaaa P.R.F. aaaaa Load impedance aa Method of mounting aaaaa Insulation resistance (standard atmosphere)1.2.4.2.1Yes/No aaaaaa Self-capacitance1.2.4.15.1Yes/No a Procedure a Frequency a Winding connections a Leakage inductance1.2.4.14Yes/No a Freq
46、uency a Voltage level a Winding connections a Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9734:1978 BSI 02-20007 Manufacturers unique identification Title of test BS 9720 reference Is test needed? Requir
47、ed limit(s)Conditions of test Gen. I/P O/P1 O/P2 O/P3 O/P4Gen.I/PO/P1 O/P2 O/P3 O/P4 Q factor1.2.4.9Yes/No a Form of measurement a Frequency a Voltage level a Impedance unbalance1.2.4.11Yes/No a Capacitance unbalance1.2.4.10Yes/No a Voltage unbalance1.2.4.12Yes/No a Frequency aaaaa Voltage level aaa
48、aa Load current aa Winding connections a Resistance unbalance1.2.4.13Yes/No a Winding connections a D.C winding resistance1.2.4.1.1Yes/No a Maximum current a Procedure 1 or 2 aaaaa Winding to be connected a Insulation resistance (hot) 1.2.4.2.2Yes/No a Maximum winding temperature aaaaa Conditioning
49、period aaaaa Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9734:1978 8 BSI 02-2000 Manufacturers unique identification Title of testBS 9720 reference Is test needed?Required limit(s)Conditions of test Gen.I/PO/P1 O/P2 O/P3 O/P4Gen.I/PO/P1O/P2O/P3O/P4 Electrostatic scree