EN 3475-605-2018 Aerospace series - Cables electrical aircraft use - Test methods - Part 605 Wet short circuit test.pdf

1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Aerospace series Cables, electrical, aircraft use Test methodsPart 605: Wet short circuit testBS EN 3475-605:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-605 January 2018 ICS 49.060 Supersedes EN 3475-6

2、05:2010English Version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 605: Wet short circuit test Srie arospatiale - Cbles lectriques usage aronautique - Mthodes dessais - Partie 605 : Essai de court-circuit humide Luft- und Raumfahrt - Elektrische Leitungen fr Luftfahrtve

3、rwendung - Prfverfahren - Teil 605: Verhalten nach Kurzschluss, feucht 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 sta

4、ndard 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 official versions (English, French, German). A version in

5、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 Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Re

6、public, 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, Spain, Sweden, Switzerland, Turkey and United Kingdom

7、. 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 worldwide for CEN national Members. Ref. No. EN 3475-605:2

8、018 ENational forewordThis British Standard is the UK implementation of EN 3475-605:2018. It supersedes BS EN 3475-605:2010, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology.A list of organi

9、zations 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 Institution 2018 Published by BSI Standards Limited 2018

10、ISBN 978 0 580 98576 8ICS 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 28 February 2018.Amendments/corrigenda issued since publicationDate Text affected

11、BRITISH STANDARDBS EN 3475-605:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-605 January 2018 ICS 49.060 Supersedes EN 3475-605:2010English Version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 605: Wet short circuit test Srie arospatiale - Cbles lectrique

12、s usage aronautique - Mthodes dessais - Partie 605 : Essai de court-circuit humide Luft- und Raumfahrt - Elektrische Leitungen fr Luftfahrtverwendung - Prfverfahren - Teil 605: Verhalten nach Kurzschluss, feucht This European Standard was approved by CEN on 28 August 2017. CEN members are bound to c

13、omply 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 CEN-CENE

14、LEC 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 CEN member into its own language and notified to the CEN-CENELEC Management Centre has the

15、 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 Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembo

16、urg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, 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

17、Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3475-605:2018 EBS EN 3475-605:2018EN 3475-605:2018 (E) 2 Contents Page European foreword . 3 1 Scope 4 2 Normative references 4 3 Specimen requirements 4 4 Preparation o

18、f specimen 4 5 Apparatus . 6 6 Method 8 7 Requirements . 9 BS EN 3475-605:2018EN 3475-605:2018 (E) 3 European foreword This document (EN 3475-605:2018) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out

19、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. This European Standard shall be given the status of a national standard, either by public

20、ation 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 elements of this document may be the subject of patent rights. CEN shall not be held respo

21、nsible for identifying any or all such patent rights. This document supersedes EN 3475-605:2010. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cypr

22、us, 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, Spain, Sweden, Switzerland, Turkey and th

23、e United Kingdom. BS EN 3475-605:2018EN 3475-605:2018 (E) 4 1 Scope This European Standard specifies a method for appraising the behaviour of cable insulation subjected to an electric arc initiated and maintained by a contaminating fluid. This European Standard shall be used together with EN 3475-10

24、0. 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 damaged and subjected to aqueous fluid contamination such that electrical arcing occurs between cables; to e

25、xamine 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 conditions for 230 Vac network. Unless otherwise specified in product standard, only 115 Vac conditions shall be satisfied. Six (6) level

26、s 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-circuit phenomenon becomes dominant at low line impedances. Unless otherwise specified in the technical/product standard sizes 00

27、2, 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 indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the

28、referenced document (including any amendments) applies. EN 2350, Aerospace series Circuit breakers Technical specification EN 3197, Aerospace series Design and installation of aircraft electrical and optical interconnection systems EN 3475-100, Aerospace series Cables, electrical, aircraft use Test

29、methods Part 100: General 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. 4 Preparation of specimen 4.1 Cut seven (7) separate lengths of approx

30、imately 0,5 m consecutively from one (1) length of cable, and strip one of the ends of insulation to permit electrical connection. Clean each length of cable with a clean cloth moistened with propan-2-ol (isopropyl alcohol) fluid. 1) Published by: Department of Defense Industrial Supply Center, ATTN

31、: DISC-BBEE, 700 Robbins Avenue, Philadelphia, PA 19111-5096 USA. BS EN 3475-605:2018EN 3475-605:2018 (E) 5 4.2 Lay up the seven (7) cables as follows: a) Form the cables in a six (6) around one (1) configuration as shown in Figure 1. b) Ensure that all cables are straight and geometrically parallel

32、, and restrained by lacing tapes such that they are in continuous contact at least within the test zone. c) Position the lacing tapes at 50 mm spacing toward the end of the specimen as shown in Figure 2. The first lacing tapes shall be at no more than 5 mm behind the dripping point. The tie material

33、 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 direct contact with the drops are numbers A1 and B1 and the centre is N. Cables C1, A2, B2 and C2 are grouped around N. Key 1 Drop needle A1-A2 : Phas

34、e A B1-B2 : Phase B C1-C2 : Phase C N : Neutral cable connected to earth Figure 1 Specimen configuration BS EN 3475-605:2018EN 3475-605:2018 (E) 6 Key 1 Lancing tape 2 Drop needle 3 Drops 4 10 mm to 20 mm 5 Ends of the 7 cables in the same plane Figure 2 Test configuration 5 Apparatus 5.1 Electrical

35、 equipment Connect the seven (7) cables of the test sample within a circuit as shown in Figure 3. This circuit shall have the following requirements: a) The provision of adjustable levels of prospective fault currents for the six (6) A, B and C cables. b) A three phase 115/200 V 400 Hz (115 Vac netw

36、ork) or 230/400 V 400 Hz (230 Vac network) star (Y) connected supply shall be derived from a dedicated rotary 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 ope

37、rate. In any case the generator shall have a sufficient rating to provide these prospective fault currents. 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

38、in the product specification. NOTE 1 Reference of circuit breakers used shall be recorded. NOTE 2 In particular 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

39、shall be established that no combination of test circuit events would activate this protection. e) The ballast Rb 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. Su

40、pply cables shall be as short as possible. BS EN 3475-605:2018EN 3475-605:2018 (E) 7 The ballast resistor Rb is in order to prevent over voltage (115 - 115 W per phase for 115 Vac network or 230 - 230 W per phase for 230 Vac network) during the arc extinction phases (opening of an inductive circuit)

41、. f) A rheostat, Rf, limiting maximum short-circuit current per phase by simulating a line length. g) Appropriate instrumentation, recording and switching control shall be installed in accordance with good laboratory practice. Key 1 Supply protection 2 Test bundle Figure 3 Test schematic circuit 5.2

42、 Test equipment Construct an apparatus as shown diagrammatically in Figure 2, which includes the following minimum provisions: a) Electrical terminations to provide a ready means of connecting test specimens into the circuit as shown in Figure 3. b) A transparent enclosure to protect personnel from

43、ejected molten metal and short wavelength ultra violet light. c) An electrolyte delivery system which provides a constant rate of (100 10) mg/min and dispenses drops from an 18 gauge needle, cut of square at the outlet. BS EN 3475-605:2018EN 3475-605:2018 (E) 8 NOTE The needle wall thickness shall b

44、e selected such that the specified flow rate shall be delivered at approximately six (6) drops per minute. 5.3 Test protocol 5.3.1 The procedure embraces copper cable sizes 001 to 051 (26 to 10) or copper clad aluminium cable sizes 002 to 090 (24 to 8), and for each cable size six (6) values of pros

45、pective fault current have been defined. Performance of a cable size at a given fault intensity shall be determined by testing three (3) samples. Thus 18 samples are required for every cable size. 5.3.2 For the purposes of cable qualification at least sizes 002, 006 and 020 shall be tested. Addition

46、al testing of other sizes may be deemed necessary in particular cases and values of prospective fault currents, the ratings of thermal breaker protection which are typical of aircraft use have been included in this specification. 5.3.3 It is emphasised that electrical arcing tests are essentially de

47、structive and can be hazardous to personnel. Therefore tests shall be undertaken with all observers shielded from direct physical and visual exposure as noted in 5.2 b). The use of video recording for all tests is required. 5.4 Test rig set-up 5.4.1 Install the rating of circuit breaker appropriate

48、to the cable type and size to be tested (Table 3). 5.4.2 Heavy duty electrical shorting connections shall be fitted in substitution of a test sample to enable prospective fault currents to be set by adjustment of resistances Rf. Because these currents would trip the thermal breakers very rapidly the

49、se shall be shunted to permit the pulsing of current until the desired value is obtained. Re-instate the thermal protection. 5.4.3 Prepare an electrolyte solution made by dissolving 3 % 0,5 % by weight of sodium chloride in distilled water. 5.4.4 Support the specimen in free air inclined at an angle of 10 to the horizontal with the electrical input connections at the higher end. 5.4.5 Position the delivery system so that the electrolyte contacts the loom from a height of (10 2) mm above the uppermost cables in the