1、BRITISH STANDARD AEROSPACE SERIES BS EN 3841-305:2004 Circuit breakers Test methods Part 305: Short-circuit performance The European Standard EN 3841-305:2004 has the status of a British Standard ICS 49.060 BS EN 3841-305:2004 This British Standard was published under the authority of the Standards
2、Policy and Strategy Committee on 21 February 2005 BSI 21 February 2005 ISBN 0 580 45528 9 National foreword This British Standard is the official English language version of EN 3841-305:2004. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electr
3、ical and fibre optic technology, to Subcommittee ACE/6/5, Circuit breakers, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publicat
4、ions referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necess
5、ary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interp
6、retation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a bac
7、k cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3841305 December2004 ICS49.060 Englishversion AerospaceseriesCircuitbreakersTestmethods
8、Part305: Shortcircuitperformance SriearospatialeDisjoncteursMthodesdessais Partie305:Tenueencourtcircuit LuftundRaumfahrtSchutzschalterPrfverfahrenTeil 305:Kurzschlussverhalten ThisEuropeanStandardwasapprovedbyCENon10September2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhich
9、stipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English
10、,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Ge
11、rmany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B
12、1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN3841305:2004:EEN 3841-305:2004 (E) 2 Contents Page 1 Scope 4 2 Normative references 4 3 Method 4 EN 3841-305:2004 (E) 3 Foreword This document (EN 3841-305:2004) has been prepared by t
13、he European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA,
14、prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2005, and conflicting national standards shall be withdrawn at the latest by June 2005. According to the CEN/
15、CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg,
16、Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 3841-305:2004 (E) 4 1 Scope This standard specifies a method of verifying the short-circuit performance of circuit breakers. It shall be used together with EN 3841-100. 2 Normative ref
17、erences The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 3841-100, Aerospace series Circuit bre
18、akers Test methods Part 100: General 3 Method 3.1 General conditions 3.1.1 Mounting The circuit breakers shall be mounted as described in EN 3841-100, in connection with the technical specification and the applicable product standard. 3.1.2 Procedure The test current shall be set while the circuit b
19、reaker is replaced by a shunt with negligible impedance. The adjustment shall be carried out with ohmic resistors and ironless inductors. NOTE If iron-core inductors are used, saturation shall not occur until the peak of the test current has been reached. The resistors and inductors shall be connect
20、ed in series. The inductance of the current source shall be taken into account when determining the time constant and the power factor. During the test, voltage, current and time shall be recorded simultaneously. 3.2 Test circuit According to Figure 1 with d.c. and a.c., single-pole. According to Fi
21、gure 2 with a.c., three-pole. EN 3841-305:2004 (E) 5 L1, L2, L3 : a.c. phases N : neutral P1 : test specimen (circuit breaker) Ug : voltage at circuit breakers terminals U k: test chamber (for explosion proofness) F1, F2 : fuses 0,1 A S1 : main switch L : inductance R : loading resistor W or M : con
22、verter or shunt for current measurement Where Figure 1 Figure 2 EN 3841-305:2004 (E) 6 3.3 Operations 3.3.1 Break operation (CO) The circuit breakers shall be switched on without current, i.e. with the test circuit opened by the main switch (S1) (see Figures 1 and 2). Then the short-circuit shall be
23、 initiated by the main switch. 3.3.2 Make operation (OCO) The circuit breakers shall be switched off. Main switch (S1) shall be closed so as to prepare the short-circuit. Then the short-circuit shall be initiated by switching the circuit breaker on. Afterwards the switch on the actuator shall be mai
24、ntained in the “on” position. 3.4 Operating conditions Test current, power factor or time constant, number of operations, altitude, and switching sequence shall be defined in the product standard. There shall be an interval of 6 min to 10 min between two operations. After each break operation, the t
25、est voltage at the circuit breakers terminals shall be maintained for at least 1 min (main switch S1 shall remain closed). When multi-pole circuit breakers are tested for single-pole overload tripping, the remaining poles shall carry 0,9 In. 3.5 Requirements The ground fuses shall not blow during th
26、e operations. Verification of technical characteristics in accordance with technical specification and product standard. blankBS EN 3841-305:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standard
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