【BS英國標準】BS EN 61558-2-1-1998 Safety of power transformers, power supply units and similar-Part 2.1 Particular requirements for separating transformers

licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsibritish standard bs en61558-2-1:1998iec 61558-2-1:1997incorporatingamendment no. 1safety of power transformers, power supply units and similar part 2.1 particular requirements for separating transformers for general usethe european standard en 61558-2-1:1997 has the status of abritish standardics 29.180bs en 61558-2-1:1998national forewordthis 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 committeepel/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-referencesattention 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 pagesthis 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.licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsiamd. no.datecomments10138august 1998indicated by a sideline in the marginthis british standard, having been prepared under the direction of the electrotechnical sector board, was published under the authority of the standards board and comesinto effect on15 january 1998 bsi 04-1999isbn 0 580 28523 5amendments issued since publicationlicensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsibs en 61558-2-1:1998contentspage national forewordinside front cover foreword2text of en 61558-2-13 bsi 04-1999iiiblanklicensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsieuropean standard norme europenneeuropische normen 61558-2-1november 1997ics 29.180descriptors: transformers, electrical insulation, safety requirements, detail specifications, characteristics, ability to withstand short circuit, overload protection, mechanical strength, insulation resistanceenglish versionsafety of power transformers, power supply units and similar part 2-1: particular requirements for separating transformers for general use(iec 61558-2-1:1997)scurit des transformateurs, blocs dalimentation et analoguespartie 2-1: rgles particulires pour lestransformateurs disolement enroulement spars pour usage gnral (cei 61558-2-1:1997)sicherheit von transformatoren, netzgerten und dergleichenteil 2: besondere anforderungen antransformatoren mit getrennten wicklungen fr allgemeine anwendungen (iec 61558-2-1:1997)licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsithis 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.ceneleceuropean committee for electrotechnical standardization comit europen de normalisation electrotechnique europisches komitee fr elektrotechnische normungcentral secretariat: rue de stassart 35, b-1050 brussels1997 cenelec all rights of exploitation in any form and by any means reserved worldwide forcenelec members.ref. no. en 61558-2-1:1997 een 61558-2-1:19977 bsi 04-1999forewordthe text of document 96/48/fdis, future edition 1 ofcontentspagelicensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsiiec 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: latest date by which the en has to be implemented at national level by publication of an identical nationalstandard or by endorsement (dop) 1998-02-01 latest date by which the national standards conflicting with the en haveto be withdrawn(dow) 2000-08-01for 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 noticethe text of the international standardiec 61558-2-1:1997 was approved by cenelec as a european standard without any modification.foreword21scope32normative references33definitions 34general requirements35general notes on tests 36ratings 37classification48marking and other information49protection against accessibility tohazardous live parts 410change of input voltage setting411output voltage and outputcurrent under load412no-load output voltage513short-circuit voltage514heating515short-circuit and overload protection516mechanical strength517protection against harmful ingress of dust, solid objects and moisture518insulation resistance and dielectric strength 519construction620components621internal wiring 622supply connection and other external flexible cable or cords623terminals for external conductors624provision for protective earthing625screws and connections626creepage distances, clearances and distances through insulation 627resistance to heat, abnormal heat, fire and tracking628resistance to rusting 6annex c material group ii7annex d material group i7table 101 output voltage deviation5licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsi1 scopereplacement: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 vripple-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 1 normally, 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 2 for transformers filled with liquid dielectric or pulverised material, such as sand, additional requirements are under consideration.note 3 in locations where special environmental conditions prevail, particular requirements may be necessary in accordance withiec 364-5-51.2 normative referencesthis clause of part 1 is applicable.3 definitionsthis clause of part 1 is applicable.4 general requirementsthis clause of part 1 is applicable.5 general notes on teststhis clause of part 1 is applicable.6 ratingsthis 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) bsi6.103 the rated frequency shall not exceed 500 hz.6.104 the rated supply voltage shall not exceed 1 000 v a.c.7 classificationthis clause of part 1 is applicable.8 marking and other informationthis clause of part 1 is applicable except as follows:8.11 addition:fail-safe separating transformernon-short-circuit-proof separating transformershort-circuit-proof separating transformer(inherently or non-inherently)9 protection against accessibility to hazardous live partsthis clause of part 1 is applicable.10 change of input voltage settingthis clause of part 1 is applicable.11 output voltage and output current under loadthis clause of part 1 is applicable.licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsi12 no-load output voltagethis 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.note the ratio is defined as follows:no-loadloadu u- 100uloadtable 101 output voltage deviationtype of transformerratio between output voltage at no load and at rated output%inherently short-circuit-proof transformers: up to and including 63 va over 63 va up to and including 630 va over 630 va other transformers: up to and including 10 va over 10 va up to and including 25 va over 25 va up to and including 63 va over 63 va up to and including 250 va over 250 va up to and including 630 va over 630 va100502010050201510512.102 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 voltagethis clause of part 1 is applicable.14 heatingthis clause of part 1 is applicable.15 short-circuit and overload protectionthis clause of part 1 is applicable.16 mechanical strengththis clause of part 1 is applicable.17 protection against harmful ingress of dust, solid objects and moisturethis clause of part 1 is applicable.18 insulation resistance and dielectric strengththis 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.licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsi19 constructionthis clause of part 1 is applicable except as follows:19.1 addition:the insulation between input circuit(s) and output circuit(s) shall consist of at least basic insulation.20 componentsthis clause of part 1 is applicable.21 internal wiringthis clause of part 1 is applicable.22 supply connection and other external flexible cable or cordsthis clause of part 1 is applicable.23 terminals for external conductorsthis clause of part 1 is applicable.24 provision for protective earthingthis clause of part 1 is applicable.25 screws and connectionsthis clause of part 1 is applicable.26 creepage distances, clearances and distances through insulationthis clause of part 1 is applicable except as follows:box 2 of table 13, table c.1 and table d.1 is not applicable.27 resistance to heat, abnormal heat, fire and trackingthis clause of part 1 is applicable.28 resistance to rustingthis clause of part 1 is applicable.licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsiannexesthe annexes of part 1 are applicable except as follows:annex c material group iithis annex of part 1 is applicable except as follows: box 2 of table c.1 is not applicable.annex d material group ithis annex of part 1 is applicable except as follows: box 2 of table d.1 is not applicable.licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:53:53 gmt+00:00 2007, uncontrolled copy, (c) bsibs en61558-2-1:1998iec 61558-2-1:1997bsi389 chiswick high roadlondonw4 4albsi british standards institutionbsi is the independent national body responsible for preparingbritish standards. it presents the uk view on standards in europe and at the international level. it is incorporated by royal charter.revisionsbritish standards are updated by amendment or revision. users ofbritish standards should make sure that they possess th