1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationSafety of transformers, reactors, power supply units and combinations thereofPart 2-12: Particular requirements and tests for constant voltage transformers and power supply units
2、 for constant voltageBS EN 61558-2-12:2011National forewordThis British Standard is the UK implementation of EN 61558-2-12:2011. It is identical to IEC 61558-2-12:2011. It supersedes BS EN 61558-2-12:2001,which will be withdrawn on 3 March 2014.The UK participation in its preparation was entrusted t
3、o Technical Committee PEL/96, Small transformers.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011ISBN
4、978 0 580 64546 4 ICS 29.180Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2011.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STA
5、NDARDBS EN 61558-2-12:2011EUROPEAN STANDARD EN 61558-2-12 NORME EUROPENNE EUROPISCHE NORM March 2011 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B
6、 - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61558-2-12:2011 E ICS 29.180 Supersedes EN 61558-2-12:2001English version Safety of transformers, reactors, power supply units and combinations thereof - Part 2
7、-12: Particular requirements and tests for constant voltage transformers and power supply units for constant voltage (IEC 61558-2-12:2011) Scurit des transformateurs, bobines dinductance, blocs dalimentation et des combinaisons de ces lments - Partie 2-12: Exigences particulires et essais pour les t
8、ransformateurs tension constante et les blocs dalimentation pour tension constante (CEI 61558-2-12:2011) Sicherheit von Transformatoren, Drosseln, Netzgerten und entsprechende Kombinationen - Teil 2-12: Besondere Anforderungen und Prfungen fr magnetische Spannungskonstanthalter und Netzgerte, die Sp
9、annungskonstanthalter enthalten (IEC 61558-2-12:2011) This European Standard was approved by CENELEC on 2011-03-03. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without
10、 any alteration. Up-to-date 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
11、made by translation 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, Bulgaria, Croatia, Cyprus, the Czech Republic
12、, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61558-2-12:2011EN 61558-2-12:2011 Foreword Th
13、e text of document 96/370/FDIS, future edition 2 of IEC 61558-2-12, prepared by IEC TC 96, Transformers, reactors, power supply units and similar products for low voltage up to 1 100 V, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61558-2-12 on 2011-03-03. This Eu
14、ropean Standard supersedes EN 61558-2-12:2001. The main changes consist of updating EN 61558-2-12:2011 in accordance with EN 61558-1:2005 + A1:2009. This standard is to be used in conjunction with EN 61558-1:2005 + A1:2009 This part supplements or modifies the corresponding clauses in EN 61558-1, so
15、 as to convert that publication into the European Standard: Particular requirements and tests for constant voltage transformers and power supply units for constant voltage. Where a particular subclause of Part 1 is not mentioned in this part, that subclause applies as far as is reasonable. Where thi
16、s part states “addition“, “modification“ or “replacement“, the relevant text of Part 1 has to be adopted accordingly. In this part, the following print types are used: requirements proper: in roman type; test specifications: in italic type; explanatory matter: in smaller roman type. In the text of t
17、his part the words in bold are defined in Clause 3. Subclauses, notes, figures and tables are additional to those in Part 1 are numbered starting from 101; supplementary annexes are entitled AA, BB, etc. Attention is drawn to the possibility that some of the elements of this document may be the subj
18、ect of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. 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 (dop) 2011-12-03 l
19、atest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2014-03-03 _ Endorsement notice The text of the International Standard IEC 61558-2-12:2011 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography,
20、 the following note has to be added for the standard indicated: IEC 61558-2-16:2009 NOTE Harmonized as EN 61558-2-16:2009 (not modified). _ BS EN 61558-2-12:201161558-2-12 IEC:2011 CONTENTS 1 Scope . . 5 2 Normative references . 7 3 Terms and definitions . 7 4 General requirements . 7 5 General note
21、s on tests . 7 6 Ratings 7 7 Classification 8 8 Marking and other information . 8 9 Protection against electric shock . . 9 10 Change of input voltage setting . . 9 11 Output voltage and output current under load . 9 12 No-load output voltage . 10 13 Short-circuit voltage . 11 14 Heating . 11 15 Sho
22、rt-circuit and overload protection . 11 16 Mechanical strength . 12 17 Protection against harmful ingress of dust, solid objects and moisture . 12 18 Insulation resistance, dielectric strength and leakage current . 12 19 Construction . 13 20 Components . 17 21 Internal wiring . . 17 22 Supply connec
23、tion and other external flexible cables or cords . . 17 23 Terminals for external conductors . 17 24 Provision for protective earthing . 17 25 Screws and connections . 17 26 Creepage distances, clearances and distances through insulation . 17 27 Resistance to heat, fire and tracking . . 18 28 Resist
24、ance to rusting . . 18 Annexes . . 19 Annex C (normative) 19 Annex D (normative) 19 Annex L (normative) 19 Annex R (normative) 19 Bibliography . 20 BS EN 61558-2-12:201161558-2-12 IEC:2011 5 SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS AND COMBINATION THEREOF Part 2-12: Particular requiremen
25、ts and tests for constant voltage transformers and power supply units for constant voltage 1 Scope Replacement: This part of IEC 61558 deals with the safety of constant voltage transformers for general applications and power supply units for constant voltage for general applications. Constant voltag
26、e transformers incorporating electronic circuits are also covered by this standard. NOTE 1 Safety includes electrical, thermal and mechanical aspects. Unless otherwise specified, from here onward, the term transformer covers constant voltage transformers for general applications and power supply uni
27、ts for constant voltage for general applications. This part is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced), independent or associated dry-type: constant voltage auto-transformers; constant voltage separating transformers; constant voltage isolating
28、 transformers; constant voltage safety isolating transformers. The windings may be encapsulated or non-encapsulated. This standard is applicable to transformers and power supply (linear) with internal operating frequencies not exceeding 500 Hz. This standard used in combination with Part 2-16 for sw
29、itch mode power supply (SMPS) units is also applicable to power supplies with internal operating frequencies higher than 500 Hz. Where the two requirements are in conflict, the most severe take precedence. The rated supply voltage does not exceed 1 000 V a.c., the rated supply frequency does not exc
30、eed 500 Hz, the internal operating resonant frequency does not exceed 30 kHz and the internal operating frequency does not exceed 100 MHz. The rated output does not exceed: 40 kVA for single-phase constant voltage auto-transformers; 200 kVA for poly-phase constant voltage auto-transformers; 25 kVA f
31、or single-phase constant voltage separating transformers and constant voltage isolating transformers; 40 kVA for poly-phase constant voltage separating transformers and constant voltage isolating transformers; 10 kVA for single-phase constant voltage safety isolating transformers; BS EN 61558-2-12:2
32、011 6 61558-2-12 IEC:2011 16 kVA for poly-phase constant voltage safety isolating transformers. This part is applicable to transformers without limitation of the rated output subject to an agreement between the purchaser and the manufacturer. NOTE 2 Transformers intended to supply distribution netwo
33、rks are not included in the scope. Where applicable to constant voltage auto-transformers the no-load output voltage or the rated output voltage does not exceed 1 000 V a.c. or 1 415 V ripple-free d.c., and for independent constant voltage auto-transformers, the no-load output voltage and the rated
34、output voltage exceed 50 V a.c. or 120 V ripple-free d.c.; constant voltage auto-transformers covered by this part are used only in applications where no insulation between circuits is required by the installation rules or by the end product standard. Where applicable to constant voltage separating
35、transformers the no-load output voltage or the rated output voltage does not exceed 1 000 V a.c. or 1 415 V ripple-free d.c., and for independent constant voltage separating transformers, the no-load output voltage and the rated output voltage exceed 50 V a.c. or 120 V ripple-free d.c.; constant vol
36、tage separating transformers covered by this part are used only in applications where double or reinforced insulation between circuits is not required by the installation rules or by the end product standard. Where applicable to constant voltage isolating transformers the no-load output voltage or t
37、he rated output voltage does exceed 50 V a.c. or 120 V ripple-free d.c. and where applicable, does not exceed 500 V a.c. or 708 V ripple-free d.c. The no-load output voltage and the rated output voltage may be up to 1 000 V a.c. or 1 415 V ripple-free d.c. for special applications; constant voltage
38、isolating transformers covered by this part are used only in applications where double or reinforced insulation between circuits is required by the installation rules or by the end product standard. Where applicable to constant voltage safety isolating transformers the no-load output voltage or the
39、rated output voltage does not exceed 50 V a.c. or 120 V ripple-free d.c.; constant voltage safety isolating transformers covered by this part are used only in applications where double or reinforced insulation between circuits is required by the installation rules or by the end product standard. Thi
40、s part is not applicable to external circuits and their components intended to be connected to the input terminals and output terminals of the transformers. NOTE 3 Attention is drawn to the following: for transformers intended to be used in vehicles, on board ships, and aircraft, additional requirem
41、ents (from other applicable standards, national rules, etc.) may be necessary; measures to protect the enclosure and the components inside the enclosure against external influences such as fungus, vermin, termites, solar-radiation, and icing should also be considered; the different conditions for tr
42、ansportation, storage, and operation of the transformers should also be considered; additional requirements in accordance with other appropriate standards and national rules may be applicable to transformers intended for use in special environments. NOTE 4 Future technological development of transfo
43、rmers may necessitate a need to increase the upper limit of the frequencies, until then this part may be used as a guidance document. BS EN 61558-2-12:201161558-2-12 IEC:2011 7 2 Normative references This clause of Part 1 is applicable. 3 Terms and definitions This clause of Part 1 is applicable exc
44、ept as follows: Addition: 3.101 constant voltage transformer transformer intended to limit the influence of the input voltage variations NOTE This 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 con
45、stant voltage transformer is supplied within the rated supply voltage variation 3.103 internal operating resonant frequency frequency produced within a constant voltage transformer 4 General requirements This clause of Part 1 is applicable. 5 General notes on tests This clause of Part 1 is applicabl
46、e. 6 Ratings This clause of Part 1 is applicable except as follows: Addition: 6.101 The rated output voltage shall not exceed: 1 000 V a.c. or 1 415 V ripple-free d.c. for constant voltage auto-transformers and constant voltage separating transformers; 250 V a.c. for single-phase portable constant v
47、oltage isolating transformers; 400 V a.c. for polyphase portable constant voltage isolating transformers, and 500 V a.c. or 708 V ripple-free d.c. for constant voltage isolating transformers. For constant voltage isolating transformers, the rated output voltage may be up to 1 000 V a.c. or 1 415 V r
48、ipple-free d.c. to be in accordance with the national wiring rules or for a special purpose; 50 V a.c. or 120 V ripple-free d.c. for constant voltage safety isolating transformers. BS EN 61558-2-12:2011 8 61558-2-12 IEC:2011 The rated output voltage shall exceed: 50 V a.c. or 120 V ripple-free d.c.
49、for independent constant voltage auto-transformers, constant voltage separating transformers and constant voltage isolating transformers. 6.102 The rated output shall not exceed: 40 kVA for single-phase constant voltage auto-transformers, 200 kVA for polyphase constant voltage auto-transformers, 25 kVA for single-phase constant voltage separating and isolating transformers, 40 kVA for polyphase constant voltage separating and isolating
