BS EN 61558-2-1-1998 Safety of power transformers, power supply units and similar-Part 2.1 Particular requirements for separating transformers for general use.pdf

BRITISH STANDARD BS EN 61558-2-1:1998 IEC 61558-2-1: 1997 Incorporating Amendment No. 1 Safety of power transformers, power supply units and similar Part 2.1 Particular requirements for separating transformers for general use The European Standard EN 61558-2-1:1997 has the status of a British Standard ICS 29.180 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:53:53 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 61558-2-1:1998 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1998 © BSI 04-1999 ISBN 0 580 28523 5 National foreword This British Standard is the English language version of EN 61558-2-1:1997. It was derived by CENELEC from IEC 61558-2-1:1997. The BS EN 61558 series of standards will ultimately supersede BS 3535-1, dual numbered as BS EN 60742:1996, and BS 3535-2. Until that time arrives, these latter standards are only to be used for equipment not covered by the BS EN 61558 series. The UK participation in its preparation was entrusted to Technical Committee PEL/96, Small transformers, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate 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 the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “ International Standards 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 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, the EN title page, pages 2 to 7 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 cover. Amendments issued since publication Amd. No.DateComments 10138August 1998Indicated by a sideline in the margin Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:53:53 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 61558-2-1:1998 © BSI 04-1999i Contents Page National forewordInside front cover Foreword2 Text of EN 61558-2-1 3 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:53:53 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:53:53 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 61558-2-1 November 1997 ICS 29.180 Descriptors: Transformers, electrical insulation, safety requirements, detail specifications, characteristics, ability to withstand short circuit, overload protection, mechanical strength, insulation resistance English version Safety of power transformers, power supply units and similar Part 2-1: Particular requirements for separating transformers for general use (IEC 61558-2-1:1997) Sécurité des transformateurs, blocs d alimentation et analogues Partie 2-1: Règles particulières pour les transformateurs d isolement à enroulement séparés pour usage général (CEI 61558-2-1:1997) Sicherheit von Transformatoren, Netzgeräten und dergleichen Teil 2: Besondere Anforderungen an Transformatoren mit getrennten Wicklungen für allgemeine Anwendungen (IEC 61558-2-1:1997) This European Standard was approved by CENELEC on 1997-07-01. 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 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 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels ©1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61558-2-1:1997 E Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:53:53 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 61558-2-1:1997 © BSI 04-1999 2 Foreword The text of document 96/48/FDIS, future edition 1 of IEC 61558-2-1, prepared by IEC TC 96, Small power transformers, reactors and power supply units and special transformers, reactors and power supply units: safety requirements, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61558-2-1 on 1997-07-01. The following dates were fixed: For products which have complied with the relevant national standard before 2000-08-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until 2001-08-01. This part 2-1 of EN 61558 is to be used in conjunction with EN 61558-1:1997. This part 2 supplements or modifies the corresponding clauses of EN 61558-1, so as to convert it into the European Standard “ Particular requirements for separating transformers for general use” . When a particular clause or subclause of part 1 is not mentioned in this part 2, that clause or subclause applies as far as is reasonable. Where this part 2 states “ addition” , “ modification” or “ replacement” , the relevant text of part 1 is to be adapted accordingly. Subclauses and tables which are additional to those in part 1 are numbered starting from 101. There are no special national conditions (snc) causing a deviation from this European Standard other than those listed in Annex ZA of EN 61558-1. Endorsement notice The text of the International Standard IEC 61558-2-1:1997 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4General requirements3 5General notes on tests3 6Ratings3 7Classification4 8Marking and other information4 9Protection against accessibility to hazardous live parts4 10Change of input voltage setting4 11Output voltage and output current under load4 12No-load output voltage5 13Short-circuit voltage5 14Heating5 15Short-circuit and overload protection5 16Mechanical strength5 17Protection against harmful ingress of dust, solid objects and moisture5 18Insulation resistance and dielectric strength 5 19Construction6 20Components6 21Internal wiring6 22Supply connection and other external flexible cable or cords6 23Terminals for external conductors6 24Provision for protective earthing6 25Screws and connections6 26Creepage distances, clearances and distances through insulation6 27Resistance to heat, abnormal heat, fire and tracking6 28Resistance to rusting6 Annex C Material group II7 Annex D Material group I7 Table 101 Output voltage deviation5 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 2000-08-01 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:53:53 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 61558-2-1:1997 © BSI 04-19993 1 Scope Replacement: This part 2 of IEC 61558 applies to stationary or portable, single-phase or polyphase, aircooled separating transformers, associated or not, having a rated supply voltage not exceeding 1 000 V a.c., a rated frequency not exceeding 500 Hz, and a rated output not exceeding: 1 kVA for single-phase transformers; 5 kVA for polyphase transformers. This standard is also applicable to separating transformers having a rating up to 40 kVA, however such transformers are considered as special transformers and are subjected to an agreement between the purchaser and the supplier. The no-load output voltage or the rated output voltage shall not exceed 1 000 V a.c. or 1 415 V ripple-free d.c. This standard applies to transformers where double or reinforced insulation between circuits is not required by the installation rules or by the appliance specification. NOTE 1Normally, the transformers are intended to be associated with equipment to provide voltages different from the supply voltage for the functional requirement of the equipment. The safety insulation may be provided (or completed) by other features of the equipment, such as the body. Parts of output circuits may be connected to the input circuit or to protective earth. This standard is also applicable to transformers associated with specific items of equipment, to the extent decided upon by the relevant IEC technical committees. This standard is applicable to dry type transformers. The windings may be encapsulated or non-encapsulated. NOTE 2For transformers filled with liquid dielectric or pulverised material, such as sand, additional requirements are under consideration. NOTE 3In locations where special environmental conditions prevail, particular requirements may be necessary in accordance with IEC 364-5-51. 2 Normative references This clause of part 1 is applicable. 3 Definitions This clause of part 1 is applicable. 4 General requirements This clause of part 1 is applicable. 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 The rated output voltage shall not exceed 1 000 V a.c or 1 415 V ripple-free d.c. Preferred values for the rated output voltage are: 72 V, 120 V, 230 V, 400 V, 440 V and 660 V. 6.102 The rated output shall not exceed 1 kVA for single-phase transformers and 5 kVA for poly phase transformers and 40 kVA for special single-phase or polyphase separating transformers. Preferred values for the rated output are: 25 VA, 40 VA, 63 VA, 100 VA, 160 VA, 250 VA, 400 VA, 630 VA and 1 000 VA for single-phase transformers; 630 VA, 1 000 VA, 1 600 VA, 2 500 VA and 4 000 VA for polyphase transformers. Compliance with the requirements of 6.101 and 6.102 is checked by inspection of the marking. Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:53:53 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 61558-2-1:1997 4 © BSI 04-1999 6.103 The rated frequency shall not exceed 500 Hz. 6.104 The rated supply voltage shall not exceed 1 000 V a.c. 7 Classification This clause of part 1 is applicable. 8 Marking and other information This clause of part 1 is applicable except as follows: 8.11 Addition: 9 Protection against accessibility to hazardous live parts This clause of part 1 is applicable. 10 Change of input voltage setting This clause of part 1 is applicable. 11 Output voltage and output current under load This clause of part 1 is applicable. Fail-safe separating transformer Non-short-circuit-proof separating transformer Short-circuit-proof separating transformer (inherently or non-inherently) Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:53:53 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 61558-2-1:1997 © BSI 04-19995 12 No-load output voltage This clause of part 1 is applicable except as follows: Addition: 12.101 The difference between the output voltages at no load and at rated output shall not be excessive. Compliance is checked by measuring the no-load output voltage when the transformer, at ambient temperature, is connected to the rated supply voltage at rated frequency. The difference between the values measured and the output voltage measured during the test of clause 11, expressed as a percentage of the latter voltage, shall not exceed the values shown in Table 101. NOTEThe ratio is defined as follows: Table 101 Output voltage deviation 12.102 The no-load output voltage shall not exceed 1 000 V a.c. or 1 415 V ripple-free d.c. under any circumstances even when independent output windings which are not intended to be connected in series are connected in series. 13 Short-circuit voltage This clause of part 1 is applicable. 14 Heating This clause of part 1 is applicable. 15 Short-circuit and overload protection This clause of part 1 is applicable. 16 Mechanical strength This clause of part 1 is applicable. 17 Protection against harmful ingress of dust, solid objects and moisture This clause of part 1 is applicable. 18 Insulation resistance and dielectric strength This clause of part 1 is applicable except as follows: 18.2 Table 7: value between input and output circuits for double or reinforced insulation is not applicable. 18.3 Table 8: box 2 is not applicable. Type of transformerRatio between output voltage at no load and at rated output % Inherently short-circuit-proof transformers: up to and including 63 VA100 over 63 VA up to and including 630 VA50 over 630 VA20 Other transformers: up to and including 10 VA100 over 10 VA up to and including 25 VA50 over 25 VA up to and including 63 VA20 over 63 VA up to and including 250 VA15 over 250 VA up to and including 630 VA10 over 630 VA5 Uno-loadUload Uload -100× Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:53:53 GMT+00:00 2007, Uncontrolled Copy, (c)