EN 3475-603-2018 Aerospace series - Cables electrical aircraft use - Test methods - Part 603 Resistance to wet arc tracking.pdf

1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Aerospace series Cables, electrical, aircraft use Test methodsPart 603: Resistance to wet arc trackingBS EN 3475-603:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-603 January 2018 ICS 49.060 Supersedes E

2、N 3475-603:2011English Version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 603: Resistance to wet arc tracking Srie arospatiale - Cbles lectriques usage aronautique - Mthodes dessais - Partie 603: Rsistance lamorage et la propagation darc lectrique, essai humide Luft- u

3、nd Raumfahrt - Elektrische Leitungen fr Luftfahrtverwendung - Prfverfahren - Teil 603: Lichtbogenfestigkeit, 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 E

4、uropean 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 official vers

5、ions (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 Austria,

6、 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, Spain, S

7、weden, 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 worldwide for

8、 CEN national Members. Ref. No. EN 3475-603:2018 ENational forewordThis British Standard is the UK implementation of EN 3475-603:2018. It supersedes BS EN 3475-603:2011, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrica

9、l 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 Institution

10、 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 98574 4ICS 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/corrigen

11、da issued since publicationDate Text affectedBRITISH STANDARDBS EN 3475-603:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-603 January 2018 ICS 49.060 Supersedes EN 3475-603:2011English Version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 603: Resistance t

12、o wet arc tracking Srie arospatiale - Cbles lectriques usage aronautique - Mthodes dessais - Partie 603: Rsistance lamorage et la propagation darc lectrique, essai humide Luft- und Raumfahrt - Elektrische Leitungen fr Luftfahrtverwendung - Prfverfahren - Teil 603: Lichtbogenfestigkeit, feucht This E

13、uropean 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 references

14、 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 CEN memb

15、er 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 Macedonia, Fra

16、nce, 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 EUROP

17、ISCHES 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 3475-603:2018 EBS EN 3475-603:2018EN 3475-603:2018 (E) 2 Contents Page European forewor

18、d . 3 1 Scope 4 2 Normative references 4 3 Specimen requirements 4 4 Preparation of specimen 5 5 Apparatus . 6 6 Method 9 7 Requirements 10 BS EN 3475-603:2018EN 3475-603:2018 (E) 3 European foreword This document (EN 3475-603:2018) has been prepared by the Aerospace and Defence Industries Associati

19、on 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. This Eur

20、opean 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 elements

21、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 3475-603:2011. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bou

22、nd 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, Portuga

23、l, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 3475-603:2018EN 3475-603:2018 (E) 4 1 Scope This European Standard specifies a method of assessing the behaviour of cable insulation subject to an electric arc initiated and maintained by contami

24、nating fluid along the surface of the insulation. 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 bundl

25、e is damaged and subjected to aqueous fluid contamination. Electrical arcing occurs along the surface of the insulation between damage sites on adjacent cables; to examine the aptitude of the insulation to track, to propagate electric arc to the electrical origin. Originally defined for 115 Vac netw

26、ork, this test also proposes conditions 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 agreed that sizes larger than 051 n

27、eed not be assessed since the short-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

28、 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 referenced document (including any amendments) applies. EN 2350, Aerospace series Circuit breakers Technical specification EN 3197, Aer

29、ospace 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, electrical, aircraft use Test methods Part 302: Voltage proof test A-A-5

30、2083, 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: Department of Defense Industrial Supply Center, ATTN: DISC-BBEE, 700 Robbins Avenue,

31、 Philadelphia, PA 19111-5096 USA. BS EN 3475-603:2018EN 3475-603:2018 (E) 5 4 Preparation of specimen Cut seven (7) separate lengths approximately 0,5 m consecutively from one (1) length of cable, and strip each of the ends of insulation to permit electrical connection. Clean each length of cable wi

32、th a clean cloth moistened with propan-2-ol (isopropyl alcohol) fluid. Damage two (2) lengths of the cable by inflicting a cut around the total circumference at the mid-point of the length, taking care to ensure that the cut penetrates to the conductor around the full circumference and has a width o

33、f 0,5 mm to 1,0 mm. 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) Displace the damaged cables longitudinally such that a separation of (10 0,5) mm of undamaged insulation is provided as shown in Figure 2. This is called

34、the test zone. c) Ensure that cables are straight and geometrically parallel, and restrained by lacing tapes such that they are in continuous contact within the test zone. d) Position the lacing tapes (4 1,0) mm away from outer each notch and then at 15 mm to 20 mm spacing towards the ends of the sp

35、ecimen as show in Figure 2. The tie material used adjacent to the notch shall be PTFE glass lacing tape conforming to A-A-52083 type IV, finish D, size 3. e) Number the cables as shown in Figure 1 such that the fault cables are numbers A1 and B1 and the centre is N. Cables C1, A2, B2 and C2 are grou

36、ped around N. Key 1 Drop needle A1-A2 : Phase A B1-B2 : Phase B C1-C2 : Phase C N : Neutral cable connected to earth Figure 1 Specimen configuration BS EN 3475-603:2018EN 3475-603:2018 (E) 6 Key 1 Test zone (10 0,5) mm 2 Notch 0,5 mm to 1 mm 3 15 mm to 20 mm 4 Lacing tape 5 Drop needle Figure 2 Test

37、 configuration 5 Apparatus 5.1 Electrical equipment Connect the seven (7) cables of the test specimen within the circuit 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 and an

38、 electrical return path for the N cable. b) A three (3) 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 rotary machine capable of sustaining the maximum prospective fault current given in Table 1 (115 Vac netw

39、ork) or Table 2 (230 Vac network) for at least sufficient time for the circuit protection to operate. In any case the generator shall have a sufficient rating to provide these prospective fault currents. BS EN 3475-603:2018EN 3475-603:2018 (E) 7 c) The (115 - 115 W per phase for 115 Vac network or 2

40、30 - 230 W per phase for 230 Vac network) ballast resistors R1, are fitted in order to prevent over voltage during the arc extinction phases (opening of an inductive circuit). d) 115 Vac or 230 Vac circuit breakers (D2) shall be single pole units rated at the values specified in Table 3. They shall

41、have trip characteristics in accordance with EN 2350 or as required by the product. 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. e) The electrical

42、 power source shall be appropriately protected and should be established that no combination of test circuit events would activate this protection. f) The resistors shall be non-inductive and have appropriate power rating. Care shall be taken to position all laboratory wiring such that inductive eff

43、ects are reduced to a practical minimum. Supply cables shall be as short as possible. g) Cables A, B and C shall be connected to indication and open circuit detectors (Rg) at the entry into the grounded star point. These components shall limit the standing current to no more than 10 % of the circuit

44、 breaker rating. h) An automatic shutdown facility shall be provided, which shall, upon the detection of any open circuit during the test and after a 10 s delay, shut down the flow of electrolyte and electrical power. An open circuit in this case means either a physical break in the specimen or a th

45、ermal breaker trip. The facility to override this shutdown facility shall be provided so as to restore the power whilst still inhibiting the flow of electrolyte. The physical break in the specimen is to be indicated by lamps in series with resistor Rg. i) Appropriate instrumentation, recording and s

46、witching control shall be installed in accordance with good laboratory practice. j) Adjust resistor Rg so that the current (I) in the circuit is 10 % of value of the circuit breaker rated current. BS EN 3475-603:2018EN 3475-603:2018 (E) 8 Key 1 Phase A 2 Phase B 3 Phase C 4 Supply protection 5 Test

47、bundle 6 Indicators (lamp) + Rg Figure 3 Test schematic circuit 5.2 Test equipment Construct an apparatus as shown diagrammatically in Figure 3 which includes the following minimum provisions: a) Electrical terminations to provide a ready means of connecting test specimens into the circuit as shown

48、in Figure 2. b) A transparent enclosure to protect personnel from ejected molten metal and short wavelength ultra violet light. c) An electrolyte delivery system which provides a constant rate of (100 10) mg per minute and dispenses drops from an 18 gauge needle cut square at the outlet. NOTE The ne

49、edle wall thickness should be selected such that the specified flow rate will be delivered at approximately six (6) to ten (10) drops per minute. 5.3 Test protocol 5.3.1 The procedure embraces copper cable sizes 001 to 051 (26 to 10) or aluminium cable sizes 002 to 051 (24 to 10) and for each size six (6) values of prospective maximum fault current to be set by adjustment of resistances Rf have been defined in Table 1 or Table 2. Performance of the cable at a given fault current shall be de