1、BRITISH STANDARD AEROSPACE SERIES BS EN 3841-306:2004 Circuit breakers Test methods Part 306: Service life The European Standard EN 3841-306:2004 has the status of a British Standard ICS 49.060 BS EN 3841-306:2004 This British Standard was published under the authority of the Standards Policy and St
2、rategy Committee on 21 February 2005 BSI 21 February 2005 ISBN 0 580 45529 7 National foreword This British Standard is the official English language version of EN 3841-306:2004. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibr
3、e 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 publications referred
4、 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 necessary provision
5、s 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 interpretation, or
6、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 back cover. The
7、BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3841306 December2004 ICS49.060 Englishversion AerospaceseriesCircuitbreakersTestmethodsPart306: Serv
8、icelife SriearospatialeDisjoncteursMthodesdessais Partie306:Duredevie LuftundRaumfahrtSchutzschalterPrfverfahrenTeil 306:Lebensdauer ThisEuropeanStandardwasapprovedbyCENon10September2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an
9、 Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagema
10、debytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,L
11、atvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitation
12、inanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN3841306:2004:EEN 3841-306:2004 (E) 2 Contents Page 1 Scope 4 2 Normative references 4 3 Method 4 EN 3841-306:2004 (E) 3 Foreword This document (EN 3841-306:2004) has been prepared by the European Association of Aerospace Manufac
13、turers - 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, prior to its presentation to CEN. This Europ
14、ean 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/CENELEC Internal Regulations, the national s
15、tandards 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, Malta, Netherlands, Norway, Poland, Portugal
16、, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 3841-306:2004 (E) 4 1 Scope This standard specifies a method of verifying the service life of circuit breakers. It shall be used together with EN 3841-100. 2 Normative references The following referenced documents are indispensa
17、ble 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 breakers Test methods Part 100: General 3 Method 3.1 General
18、 conditions The circuit breakers shall be mounted as specified in EN 3841-100, in connection with the applicable technical specification and the product standard. The adjustment of the test current shall be carried out with ohmic resistors and ironless inductors. NOTE If iron-core inductors are used
19、, saturation shall not occur until the peak of the test current has been reached. The resistors and inductors shall be connected in series. The inductance of the current source shall be taken into account when determining the time constant and the power factor. 3.2 Test circuit According to Figure 1
20、 with d.c. and a.c., single-pole. According to Figure 2 with a.c., three-pole. EN 3841-306:2004 (E) 5 U k: test chamber (for explosion proofness) L1, L2, L3 : a.c. phases N : neutral W or M : converter or shunt for current measurement P1 : test specimen (circuit breaker) U g: voltage at circuit brea
21、kers terminals Key 1 d.c.; a.c. Figure 1 Key 1 d.c.; a.c. Figure 2 Where S1 : main switch L : inductance R : loading resistor EN 3841-306:2004 (E) 6 3.3 Operations One operating cycle is defined as one closing and then one opening of the circuit breakers. The circuit breakers may be operated either
22、manually or by means of a mechanical device simulating the manual operation as much as possible. The test shall be carried out with two operating cycles per minute (electrical tests) or six or seven operating cycles per minute (mechanical tests) at an actuating speed of 12 mm/s, with a duty cycle of
23、 20 %. 3.4 Service life without load The number of operating cycles shall be specified in the product standard. Verification tests in accordance with technical specification and product standard. 3.5 Service life at rated current The number of operating cycles and the applicable load values shall be
24、 specified in the product standard. The load of the signal contacts related to the load of the main contacts shall also be indicated in the product standard. Verification tests in accordance with technical specification and product standard. 3.6 Service life at low current The number of operating cy
25、cles shall be specified in the product standard. Verification tests in accordance with technical specification and product standard. 3.7 Service life with overload tripping 3.7.1 General The number of operating cycles and the applicable load values shall be specified in the product standard. 3.7.2 O
26、perations 3.7.2.1 Break operation (CO) The circuit breakers shall be switched on without current. Then the overload shall be switched an to the circuit breakers by means of the main switch (S1) and maintained until the circuit breakers trip. 3.7.2.2 Make operation (OCO) The main switch (S1) shall be
27、 closed and the circuit breakers shall be switched on. Then the actuator button shall be released at normal operating speed. Switch off is by overload tripping. 3.7.2.3 Operating conditions When multi-pole circuit breakers are tested for single-pole overload tripping, the remaining poles shall carry
28、 0,9 In. The number of operating cycles and the switching sequence shall be indicated in the product standard. 3.7.3 Verification tests In accordance with technical specification and product standard 3.8 Test combinations The product standard may specify test combinations according to 3.4, 3.5, 3.6
29、and 3.7 in a defined sequence. blankBS EN 3841-306:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is in
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