【BS英国标准】BS EN 61558-2-20-2001 Safety of power transformers, power supply units and similar devices — Part 2-20 Particular requirements for small react

licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:48:11 gmt+00:00 2007, uncontrolled copy, (c) bsibritish standard bs en61558-2-20:2001iec61558-2-20:2000safety of powertransformers, power supply units and similar devices part 2-20:particular requirements for small reactorsthe european standard en 61558-2-20:2000 has the status of abritish standardics 29.180no copying without bsi permission except as permitted by copyright lawbs en 61558-2-20:2001national forewordthis british standard is the official english language version of en 61558-2-20:2000. it is identical with iec 61558-2-20:2000.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.licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:48:11 gmt+00:00 2007, uncontrolled copy, (c) bsithis british standard, having been prepared under the direction of the electrotechnical sector committee, was published under the authority of the standards committee and comes into effect on15 june 2001 bsi 06-2001isbn 0 580 37298 7summary of pagesthis document comprises a front cover, an inside front cover, the en title page,pages 2 to 15 and a back cover.the bsi copyright date displayed in this document indicates when the document was last issued.amd. no.datecommentsamendments issued since publicationeuropean standarden 61558-2-20norme europenneeuropische normnovember 2000ics 29.180english versionsafety of power transformers, power supply units and similar devicespart 2-20: particular requirements for small reactors(iec 61558-2-20:2000)scurit des transformateurs, blocs dalimentation et dispositifs analogues partie 2-20: rgles particulires pour les petites bobines dinductance(cei 61558-2-20:2000)sicherheit von transformatoren, netzgerten und dergleichenteil 2-20: besondere anforderungen an kleindrosseln(iec 61558-2-20:2000)licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:48:11 gmt+00:00 2007, uncontrolled copy, (c) bsithis european standard was approved by cenelec on 2000-08-01. 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 brussels 2000 cenelec - all rights of exploitation in any form and by any means reserved worldwide for cenelec members.ref. no. en 61558-2-20:2000 epage 15en 61558220:2000licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:48:11 gmt+00:00 2007, uncontrolled copy, (c) bsiforewordthe text of document 96/146/fdis, future edition 1 of iec 61558-2-20, prepared by 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 61558-2-20 on 2000-08-01.the following dates were fixed: latest date by which the en has to be implemented at national level by publication of an identicalnational standard or by endorsement(dop) 2001-05-01 latest date by which the national standards conflictingwith the en have to be withdrawn(dow) 2003-08-01this part 2-20 is to be used in conjunction with en 61558-1:1997, safety of power transformers, power supply units and similar - part 1: general requirements and tests.this part 2-20 supplements or modifies the corresponding clauses of en 61558-1.where a particular clause or subclause of part 1 is not mentioned in this part 2-20, that clause or subclause applies as far as is reasonable. where this part 2-20 states addition, modification or replacement, the relevant text of part 1 is to be adapted accordingly.in this standard , the following print types are used:-requirement: in roman type;-test specifications: in italic type;-notes: in smaller roman type.in the text of this standard, the words in bold are defined in clause 3.subclauses which are additional to those in part 1 are numbered starting from 101.endorsement noticethe text of the international standard iec 61558-2-20:2000 was approved by cenelec as a europeanstandard without any modification.in the official version, for annex s, bibliography, the following notes have to be added for the standards indicated:iec 60289note: harmonized as en 60289:1994 (modified).iec 60920note: harmonized as en 60920:1991 (not modified). iec 60922note: harmonized as en 60922:1997 (not modified).licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:48:11 gmt+00:00 2007, uncontrolled copy, (c) bsicontentspageclause1scope . 42normative references . 53definitions. 54general requirements. 75general notes on tests . 76ratings . 77classification . 78marking and other information . 89protection against accessibility to hazardous live parts . 910 change of input voltage setting . 911 output voltage and output current under load .1012 no-load output voltage .1013 short-circuit voltage .1014 heating .1015 short-circuit and overload protection .1116 mechanical strength .1217 protection against harmful ingress of dust, solid objects and moisture .1218 insulation resistance and dielectric strength .1319 construction .1320 components .1321 internal wiring .1422 supply connection and other external flexible cords .1423 terminals for external conductors .1424 provision for protective earthing .1425 screws and connections .1426 creepage distances, clearances and distances through insulation .1427 resistance to heat, abnormal heat, fire and tracking.1428 resistance to rusting.14annex s .15 bsi 06-2001licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:48:11 gmt+00:00 2007, uncontrolled copy, (c) bsisafety of power transformers,power supply units and similar devices part 2-20: particular requirements for small reactors1scopereplacement:this part of iec 61558 applies to stationary or portable, single-phase or poly-phase, air-cooled (naturalorforced)generalpurposesmallreactors,includingalternatingcurrent, premagnetised and current compensated reactors, independent or associated, having a rated supply voltage not exceeding 1 000 v a.c. or d.c. and rated frequency not exceeding 1 mhz, the rated power not exceeding2 kvar a.c. (2 kw d.c.) for single-phase reactors;10 kvar a.c. (10 kw d.c.) for poly-phase reactors.this standard is also applicable to small reactors without limitation of the rated power; however, such small reactors are considered as special reactors and are subjected to an agreement between the purchaser and the supplier.this standard is applicable to dry-type small reactors. the windings may be encapsulated or non-encapsulated.this standard does not apply toreactors covered by iec 60289;ballast for tubular fluorescent lamps covered by iec 60920;ballast for discharge lamps (excluding tubular fluorescent lamps) covered by iec 60922.note 1 for small reactors filled with liquid dielectric or pulverised material such as sand, additional requirements are under consideration.note 2 in locations where special environmental conditions prevail, particular requirements may be necessary. note 3 normally, small reactors are intended to be associated with equipment for functional requirements of theequipment or requirements by the installation rules or by other appliance specifications.note 4 small reactors incorporating electronic circuits and components are also covered by this standard.note 5 the safety insulation may be provided (or completed) by other parts or features of the equipment, such as the body.note 6 small reactors for particular applications will in the future be covered by complementary normative annexes.licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:48:11 gmt+00:00 2007, uncontrolled copy, (c) bsi2normative referencesthis clause of part 1 is applicable.3definitionsthis clause of part 1 is applicable except as follows:modification:w here part 1 is applicable, the word transformer, if used, shall be replaced by reactor.addition:3.1.101 reactorarrangement comprising one or more windings with an impedance depending on the frequency,working in accordance with the principle of self-induction whereby a magnetising current generates a magnetic field through a magnetically effective core or through airnote reactors with torodal core are also included in this definition.3.1.102alternating current reactorreactor in which the magnetising current generates an alternating magnetic field, changing its polarity depending on the frequency3.1.103premagnetised reactorreactor in which the magnetising direct current generates a magnetic field of only one polarity, while a superimposed alternating current alters the direct magnetic field depending on its strength and the frequency3.1.104current compensated reactorreactor with at least two windings on a common core, where the magnetising currents are in opposite directions in order to reduce the magnetic flux3.1.105overload proof reactorreactor in which the temperature does not exceed the specified limits when the reactor is overloaded and which continues to meet all requirements of this standard after the removal of the overloadnon-inherently overload proof reactoroverload proof reactor equipped with a protective device which opens the circuit, or reduces the current in the circuit when the reactor is overloaded, and which continues to meet all requirements of this standard after the removal of the overload and resetting or replacing of the protective devicenote 1 examples of protective devices are fuses, overload releases, thermal fuses, thermal links, thermal cut- outs, ptc resistors and automatic circuit-breakers.note 2 in case of protection by a device which cannot be replaced nor re-set, the wording continues to meet all requirements of this standard after removal of the overload does not imply that the reactor continues to operate.licensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:48:11 gmt+00:00 2007, uncontrolled copy, (c) bsiinherently overload proof reactoroverload proof reactor not equipped with a device to protect the reactor and in which the temperature in the case of overload, by construction, does not exceed the specified limits and which continues to operate and meet all the requirements of this standard after the removal of the overload3.1.106non-overload proof reactorreactor which is intended to be protected against excessive temperature by means of a protective device not provided with the reactor and which continues to meet all the requirements of this standard after the removal of the overload and resetting or replacing of the protective device3.1.107fail-safe reactorreactor which, after abnormal use, permanently fails to function by an interruption of the failing circuit but presents no danger to the user or surroundingsreplacement:3.4circuits and windingsthis subclause of part 1 is not applicable.3.5ratingsthis subclause of part 1 is applicable except as follows:replacement:3.5.4rated currentrated current, assigned to the reactor by the manufacturer including harmonics, if any, which influence the heating of the reactoraddition:3.5.101rated powersum of the products of the rated voltage drop and the rated current at rated frequency for the different windings3.5.102rated inductanceinductance of the reactor designed by the manufacturer for the specified operating condition of the reactornote the specific operating conditions of d.c. reactors are determined by the d.c. component and the superimposed a.c. component.3.5.103rated resistanced.c. resistance of a winding of a reactor designed by the manufacturer for the specified operating conditions of the reactor3.5.104rated voltage dropvoltage across a winding of the reactor at rated current and rated frequency assigned by the manufacturerlicensed copy: institute of technology tallaght, institute of technology, mon jun 11 16:48:11 gmt+