EN 3475-604-2018 Aerospace series - Cables electrical aircraft use - Test methods - Part 604 Resistance to dry arc propagation.pdf

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1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Aerospace series - Cables, electrical, aircraft use - Test methodsPart 604: Resistance to dry arc propagationBS EN 3475604:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-604 January 2018 ICS 49.060 Supers

2、edes EN 3475-604:2010English Version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 604: Resistance to dry arc propagation Srie arospatiale - Cbles lectriques usage aronautique - Mthodes dessais - Partie 604 : Rsistance lamorage et la propagation darc lectrique, essai sec

3、Luft- und Raumfahrt - Elektrische Leitungen fr Luftfahrtverwendung - Prfverfahren - Teil 604: Lichtbogenfestigkeit, trocken This European Standard was approved by CEN on 28 August 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givin

4、g 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three offic

5、ial versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of

6、Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia,

7、Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved world

8、wide for CEN national Members. Ref. No. EN 3475-604:2018 ENational forewordThis British Standard is the UK implementation of EN 3475604:2018. It supersedes BS EN 3475604:2010, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic ele

9、ctrical and fibre optic technology.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Insti

10、tution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 98575 1ICS 49.060Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2018.Amendments/cor

11、rigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 3475604:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-604 January 2018 ICS 49.060 Supersedes EN 3475-604:2010English Version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 604: Resistan

12、ce to dry arc propagation Srie arospatiale - Cbles lectriques usage aronautique - Mthodes dessais - Partie 604 : Rsistance lamorage et la propagation darc lectrique, essai sec Luft- und Raumfahrt - Elektrische Leitungen fr Luftfahrtverwendung - Prfverfahren - Teil 604: Lichtbogenfestigkeit, trocken

13、This European Standard was approved by CEN on 28 August 2017. CEN 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 refe

14、rences concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN 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 CE

15、N member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedoni

16、a, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION

17、 EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3475-604:2018 EBS EN 3475604:2018EN 3475-604:2018 (E) 2 Contents Page European fo

18、reword . 3 1 Scope 4 2 Normative references 4 3 Specimen requirements 4 4 Preparation of specimen 5 5 Apparatus . 6 6 Method . 10 7 Requirements 13 BS EN 3475604:2018EN 3475-604:2018 (E) 3 European foreword This document (EN 3475-604:2018) has been prepared by the Aerospace and Defence Industries As

19、sociation of Europe - Standardization (ASD-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 ASD, prior to its presentation to CEN. T

20、his 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 July 2018, and conflicting national standards shall be withdrawn at the latest by July 2018. Attention is drawn to the possibility that some of the e

21、lements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 3475-604:2010. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries

22、 are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

23、 Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 3475604:2018EN 3475-604:2018 (E) 4 1 Scope This European standard specifies a method for appraising the behaviour of cable insulation when an electric arc is initiated and maintained by t

24、wo (2) powered cables rubbing against a blade. This European standard shall be used together with EN 3475-100. The primary aim of this test is: to produce, in a controlled fashion, continuous failure effects which are representative of those which may occur in service when a typical cable bundle is

25、damaged by abrasion such that electrical arcing occurs, both between cables and between cables and conductive structure, and to examine the aptitude of the insulation to track, to propagate electric arc to the electrical origin. Originally defined for 115 Vac network, this test also proposes conditi

26、ons for 230 Vac network. Unless otherwise specified in product standard, only 115 Vac conditions shall be satisfied. Six (6) levels of prospective fault current have been specified for concerned cable sizes (see Clause 7). It is generally agreed that larger sizes need not be assessed since the short

27、-circuit phenomenon becomes dominant at low line impedances. Unless otherwise specified in the technical/product standard sizes 002, 006 and 020 cable shall be assessed. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispens

28、able for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2350, Aerospace series Circuit breakers Technical specification EN 2702, Aerospace series Aluminium alloy AL-P6

29、061 T6 or T62 Drawn or extruded bar and section a or D 200 mm EN 3197, Aerospace series Design and installation of aircraft electrical and optical interconnection systems EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General EN 3475-302, Aerospace series Cable

30、s, electrical, aircraft use Test methods Part 302: Voltage proof test A-A-52083, Tape, lacing and tying, glass 1)3 Specimen requirements Cables to be tested shall be of traceable origin and shall have passed the high voltage dielectric test defined in the product standard. 1) Published by: Departmen

31、t of Defense Industrial Supply Center, ATTN: DISC-BBEE, 700 Robbins Avenue, Philadelphia, PA 19111-5096 USA. BS EN 3475604:2018EN 3475-604:2018 (E) 5 4 Preparation of specimen 4.1 Cut seven (7) separate lengths of approximately 0,5 m consecutively from one length of cable, and strip each of the ends

32、 of insulation to permit electrical connection. Clean each length of cable with a clean cloth moistened with propan-2-ol (isopropyl alcohol) fluid. 4.2 Lay up the seven (7) cables as follows: a) Form the cables in a six around one configuration as shown in Figure 1. b) Ensure that all cables are str

33、aight and geometrically parallel, and restrained by lacing tapes such that they are in continuous contact for at least a 75 mm continuous length around the mid point of the loom length. This is called the test zone. c) Position the lacing tapes at 15 mm to 20 mm spacing within the test zone. The tie

34、 material shall be PTFE glass lacing tape conforming to A-A-52083 type IV, finish D, size 3. d) Number the cables as shown in Figure 1 such that the cables in contact with the blade are numbers A1 and B1. Test Blade Key 1 Original position 2 Final position A1-A2 : Phase A B1-B2 : Phase B C1-C2 : Pha

35、se C N1-N2 : Inactive cables connected to earth Figure 1 Specimen configuration BS EN 3475604:2018EN 3475-604:2018 (E) 6 5 Apparatus 5.1 Electrical equipment Connect the seven (7) cables of the test sample within a circuit as shown in Figure 2. This circuit shall have the following requirements: a)

36、The provision of adjustable levels of prospective fault currents for the five A, B and C cables and an electrical return path for the two N cables. b) A three phase 115/200 V 400 Hz (115 Vac network) or 230/400 V 400 Hz (230 Vac network) star (Y) connected supply shall be derived from a dedicated ro

37、tary machine capable of sustaining the maximum prospective fault current given in Table 1 (115 Vac network) or Table 2 (230 Vac network) for at least sufficient time for circuit protection to operate. In any case the generator shall have a sufficient rating to provide these prospective fault current

38、s. c) 115 Vac or 230 Vac circuit breakers (D2) shall be single pole units rated at the values specified in Table 3. They shall have trip characteristics in accordance with EN 2350 or as required in the product specification. NOTE 1 Reference of circuit breakers used shall be recorded. NOTE 2 In part

39、icular case, others ratings of thermal breaker protection could be employed in accordance with aircraft manufacturer rules. d) The electrical power source shall be appropriately protected and it shall be established that no combination of test circuit events would activate this protection. e) The ba

40、llast resistors shall be non-inductive and of appropriate power rating. Care shall be taken to position all laboratory wiring such that inductive effects are reduced to a practical minimum. Supply cables shall be as short as possible. f) Cables A, B and C shall be connected to indication and open ci

41、rcuit detectors at entry into the grounded star point. These components shall limit the standing current to no more than 10 % of the circuit breaker rating. g) The automatic shutdown facility shall provide, upon the detection of any open circuit during test and after a 10 s delay, removal of the bla

42、de from the specimen and for electrical power to be removed. Open circuit in this case means either a physical break in the specimen or a thermal breaker trip. NOTE 3 In the case of the automatic shutdown facility is not used, the physical break in the specimen are detected by lamps in series with t

43、he rheostat Rg. h) A heavy duty electrical bonding strap shall be connected between the blade of the test rig and the electrical star point of the generator. i) Appropriate instrumentation, recording and switching control shall be installed in accordance with good laboratory practice. j) A rheostat

44、Rg adjusting current (I) in the circuit to a value equal to 10 % of the circuit breaker current. BS EN 3475604:2018EN 3475-604:2018 (E) 7 Key 1 Phase A 2 Phase B 3 Phase C 4 Supply protection 5 Test bundle 6 Indicators (lamp) + Rg 7 Test blade Figure 2 Test schematic circuit 5.2 Test equipment Const

45、ruct an apparatus as shown diagrammatically in Figures 3a, 3b and 3c which includes the following minimum provisions: a) A lightweight, freely pivoting test fixture to hold the blade at a 90 angle to the specimen and to exert a controlled force on the specimen. NOTE Generally a mounting on 50 mm cen

46、tres shall hold the individual cables of the specimen in close proximity. b) Electrical terminations to provide a ready means of connecting test specimens into the circuit as shown in Figure 2. c) An aluminium blade complying with material specification T6061-T6 (EN 2702) and Figure 3c. d) A mechani

47、sm to provide a minimum oscillating stroke of 15 mm excursion at a frequency of (8 2) Hz. e) A blade carrier to give a downward force at the blade of (2,5 0,1) N. BS EN 3475604:2018EN 3475-604:2018 (E) 8 f) A mechanical stop to limit the fall of the oscillating blade to within an accuracy of 0,2 mm

48、measured at the point of contact. g) Means of separating the blade from the specimen, both manually and automatically if used. h) An electrical connection of the aluminium blade to the neutral of the test power supply (see 5.1 h). i) A transparent enclosure to protect personnel from ejected molten m

49、etal and short wavelength ultra violet light. Key 1 Blade carrier guide 2 Aluminium blade 3 Bundle 4 Heat insulation (e.g.: PTFE) 5 Aluminium support Figure 3a BS EN 3475604:2018EN 3475-604:2018 (E) 9 Key 1 Blade 2 Bundle 3 Stop 4 Cable tie 5 Spring 6 Contact pressure adjustment 7 Depth adjustment shim Figure 3b Key 1 Sharpen edge with 60 grit aluminium disc sander directed “towards the blade“ (i.e. to avoid feathered edge) 2 Aluminium square (10 mm) Figure 3c BS EN 3475604:20