1、BRITISH STANDARD Safety of power transformers, power supply units and similar devices - Part 2-12: Particular requirements for constant voltage transformers The European Standard EN 61558-2-122001 has the status of a British Standard ICs 29.180; 13.260 BS EN 61558-2-12:2001 NO COPYING WTTHOIJT RSI P
2、ERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 61558-2-122001 National foreword This British Standard is the official English language version of EN 61558-2-12:2001. It is identical with IEC 61558-2-12:2001. The UK participation in its preparation was entrusted to Technical Committee PEU96, Sm
3、all transformers, which has the responsibility to: - - aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and pro
4、mulgate them in the UK. - A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during
5、 the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International S
6、tandards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. 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 St
7、andard does not of itself confer immunity from legal obligations. This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 2 November 2001 Summary
8、of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. 1Date I Comments
9、 O BSI 2 November 2001 ISBN O 580 38632 5 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM October 2001 EN 61 558-2-1 2 ICs 29.180 English version Safety of power transformers, power supply units and similar devices Part 2-1 2: Particular requirements for constant voltage transformers (IEC 61558-2-
10、12:2001) Scurit des transformateurs, blocs dalimentation et dispositifs analogues Partie 2-12: Rgles particulires pour les transformateurs tension constante Sicherheit von Transformatoren, Netzgerten und dergleichen Teil 2-12: Besondere Anforderungen an magnetische Spannungskonstanthalter (CE1 61 55
11、8-2-12:2001) (IEC 61558-2-12:2001) This European Standard was approved by CENELEC on 2001-09-01. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up
12、-todate lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
13、under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Icelan
14、d, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretanat: rue
15、 de Stassart 35,B - 1050 Brussels O 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61 558-2-12:2001 E Page 2 EN 6 1558 -2 - 12 :200 1 Foreword The text of document 96/168/FDIS, future edition 1 of IEC 61558-2-12, prepared by
16、 IEC TC 96, Small power transformers, reactors and power supply units: Safety requirements, was submitted to the IEC- CENELEC parallel vote and was approved by CENELEC as EN 61558-2-12 on 2001-09-01. This part 2-12 is to be used in conjunction with EN 61558-1:1997. This part 2-12 supplements or modi
17、fies the corresponding clauses of EN 61558-1. When a particular subclause of part 1 is not mentioned in this part 2-12, that subclause applies as far as is reasonable. Where this part 2-12 states “addition“, “modification“ or “replacement“, the relevant text of part 1 is to be adapted accordingly. I
18、n this standard, the following print types are used: - requirements: in roman type; - test specifications: in italic type; - explanatory matter: in smaller roman type. The words in bold in the text of the standard are defined in clause 3. Subclauses which are additional to those in part 1 are number
19、ed starting from 101. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement - latest date by which the national standards conflicting with the EN have to be withdrawn (dop) 2002-06-01 (
20、daw) 2004-09-01 Endorsement notice The text of the International Standard IEC 61558-2-12:2001 was approved by CENELEC as a European Standard without any modification. O BSI 2 November 2001 Page 3 EN 61558-2-122001 CONTENTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Sc
21、ope . . 4 Normative references . . 5 General requirements . 6 General notes on tests . 6 6 7 Marking and other information . Protection against accessibility to hazardous live parts . 8 Change of input voltage setting . Output voltage and output current under load . 11 Short-circuit voltage . 10 Hea
22、ting 10 No-load output voltage . 11 Short-circuit and overload protection 10 Mechanical strength . 12 Protection against harmful ingress of dust. solid objects and moisture Insulation resistance and dielectric strength Construction . 12 Components . . 16 Internal wiring 16 Supply connection and othe
23、r external flexible cables or cords . 16 Terminals for external conductors . 16 17 Screws and connections . 17 Provision for protective earthing Creepage distances, clearances and distances through insulation 17 Resistance to heat, abnormal heat, fire and tracking . 17 Resistance to rusting 17 Annex
24、es . 18 O BSI 2 November 2001 Page 4 EN 61558-2-12:2001 SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR DEVICES - Part 2-12: Particular requirements for constant voltage transformers 1 Scope Replacement: This International Standard deals with all aspects of safety such as electrical, th
25、ermal and mechanical. This part of IEC 61558 applies to stationary or portable, single-phase or polyphase, air- cooled (natural or forced), associated or independent: - constant voltage auto-transformers - constant voltage separating transformers - constant voltage isolating transformers - constant
26、voltage safety isolating transformers having a rated supply voltage not exceeding 1 O00 V a.c., a rated frequency not exceeding 500 Hz, an internal operational frequency not exceeding 30 kHz and no limitation of the rated output. NOTE 1 The technological development of transformers might imply a nee
27、d to increase the higher limit of the internal operational frequency: until such time, this standard may be used as a guide. Constant voltage independent auto-transformers - have a no-load output voltage and a rated output voltage exceeding 50 V a.c. or 120 V ripple-free d.c. and not exceeding 1 O00
28、 V a.c. or 1 415 V ripple-free d.c.; - are used where no insulation between circuits is required by the installation rules or by the equipment specification. Constant voltage associated auto-transformers - have a no-load output voltage and a rated output voltage not exceeding 1 O00 V a.c. or 1 415 V
29、 ripple-free d.c. Constant voltage independent separating transformers - have a no-load output voltage and a rated output voltage exceeding 50 V a.c. or 120 V ripple-free d.c. and not exceeding 1 O00 V a.c. or 1 415 V ripple-free d.c.; - are used where double or reinforced insulation between circuit
30、s is not required by the installation rules or by the appliance specification. Constant voltage associated separating transformers - have a no-load output voltage and a rated output voltage not exceeding 1 O00 V a.c. or 1 415 V ripple-free d.c. O BSI 2 November 2001 Page 5 EN 61558-2-12:2001 Constan
31、t voltage isolating transformers - have a no-load output voltage and/or a rated output voltage exceeding 50 V a.c. or 120 V ripple-free d.c. and not exceeding 500 V a.c. or 708 V ripple-free d.c.; the no-load output voltage and the rated output voltage may exceed these limits in order to be in accor
32、dance with the national wiring rules or special purposes; however, they shall not exceed 1 O00 V a.c. or 1 415 V ripple-free d.c.; - are used where double or reinforced insulation between circuits is required by the installation rules or by the appliance specification. Constant voltage safety isolat
33、ing transformers - have a no-load output voltage and a rated output voltage not exceeding 50 V a.c. or 120 V ripple-free d.c.; - are used where double or reinforced insulation between circuits is required by the installation rules or by the appliance specification. This standard is applicable to dry
34、-type constant voltage transformers. The windings may be encapsulated or non-encapsulated. NOTE 2 For constant voltage transformers filled with liquid dielectric or pulverized material, such as sand, additional requirements are under consideration. NOTE 3 Attention is drawn to the fact that - - NOTE
35、 4 For higher no-load output voltages or circuit voltages, additional requirements are necessary but this standard may be used as a guide. for transformers intended to be used in tropical countries, special requirements may be necessary: in locations where special environmental conditions prevail, p
36、articular requirements may be necessary. 2 Normative references This clause of part 1 is applicable. 3 Definitions This clause of part 1 is applicable except as follows: Addition: 3.101 constant voltage transformer transformer intended to limit the influence of the input voltage variations NOTE This
37、 type of transformer may also limit the influence of transients. 3.102 regulation tolerance deviation in per cent of the rated output voltage when the constant voltage transformer is supplied within the rated supply voltage variation 3.103 internal operational frequency frequency produced within a c
38、onstant voltage transformer, for example, operating in secondary switch mode O BSI 2 November 2001 Page 6 EN 61558-2-12:2001 4 General requirements This clause of part 1 is applicable except as follows: Addition: 4.101 Where part 1 is applicable, the word “transformer“ means “constant voltage transf
39、orm er“. 5 General notes on tests This clause of part 1 is applicable. 6 Ratings This clause of part 1 is applicable except as follows: Addition: 6.101 - 1 O00 V a.c. or 1 415 V ripple-free d.c. for constant voltage auto-transformers and constant voltage separating transformers; NOTE 1 For a.c. pref
40、erred values for the rated output voltage are 72V, 120 V, 230 V, 400 V, 440 V and 660 V. 500 V a.c. or 708 V ripple-free d.c. for constant voltage isolating transformers; however, for constant voltage isolating transformers, the rated output voltage may be up to 1 O00 V a.c. or 1 415 V ripple-free d
41、.c. in accordance with the national wiring rules or designed for special purposes; NOTE 2 For a.c. preferred values for the rated output voltage are 72 V, 120 V, 230 V, 400 V and 440 V. 50 V a.c. and/or 120 V ripple-free d.c. for constant voltage safety isolating transformers; NOTE 3 For a.c. prefer
42、red values for the rated output voltage are 6 V, 12 V, 24 V, 42 V and 48 V. The rated output voltage shall not exceed - - The rated output voltage shall exceed - 50 V a.c. or 120 V ripple-free d.c. for constant voltage independent auto-transformers and separating transformers; 50 V a.c. or 120 V rip
43、ple-free d.c. for constant voltage isolating transformers. - 6.102 The rated output is not limited. 6.103 The rated frequency shall not exceed 500 Hz. 6.104 range, rated output and power factor = 1. The rated value of output regulation tolerance shall be given at rated supply voltage O BSI 2 Novembe
44、r 2001 Page 7 EN 61558-2-12:2001 6.105 be less than 10 %. For constant voltage independent transformers the input voltage variation shall not 6.106 The internal operational frequency shall not exceed 30 kHz. 7 Classification This clause of part 1 is applicable. 8 Marking and other information This c
45、lause of part 1 is applicable except as follows: 8.1 a) Replacement: rated supply voltage(s) and input voltage variation in % 8.1 b) Replacement: rated output voltage(s) and the regulation tolerance of this voltage(s) in % 8.1 h) Addition: Constant voltage transformers shall be marked with one of th
46、e graphical symbols shown in 8.1 1: O BSI 2 November 2001 Page 8 EN 61558-2-12:2001 Symbol 8.1 1 Addition: Explanation n I I Non-short-circuit-proof constant voltage separating transformer ,. I n -+ 1 Short-circuit-proof constant voltage separating transformer - I A I Fail-safe constant voltage sepa
47、rating transformer n Non-short-circuit-proof constant voltage isolating transformer - 500 V a.c. or 708 V ripple-free d.c. for constant voltage isolating transformers: however, the no-load output voltage may be up to 1 O00 V a.c. or 1 415 V ripple-free d.c. in accordance with the national wiring rul
48、es or designed for special purposes; - 50 V a.c. or 120 V ripple-free d.c. for constant voltage safety isolating transformers under any circumstances even when independent output windings which are not intended to be connected in series are connected in series. The no-load output voltage shall not e
49、xceed O BSI 2 November 2001 Page 10 EN 61558-2-12:2001 The no-load output voltage shall exceed - 50 V a.c. or 120 V ripple-free d.c. for constant voltage independent auto- and separating transformers. 12.102 The difference between the no-load output voltage and the output voltage under load shall not be excessive. Compliance with the requirements of 12.101 and 12.102 is checked by measuring the no-load output voltage when the transformer, at ambient temperature, is connected to the rated supply voltage plus the highest input voltage variation at rated frequency. The differe
