1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 3475-604:2010Aerospace series Cables,electrical, aircraft use TestmethodsPart 604: Resistance to dry arc propagationBS EN 3475-604:2010 BRITISH STANDARDNational forewordThi
2、s British Standard is the UK implementation of EN 3475-604:2010.It supersedes BS EN 3475-604:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/6, Aerospace avionic electrical and fibre optictechnology.A list of organizations represented on this c
3、ommittee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 65532 6ICS 49.060Compliance with a British Standard cannot confer immunity fromlegal ob
4、ligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2010Amendments issued since publicationDate Text affectedBS EN 3475-604:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-604 July 2010 ICS 49.060 Supersedes EN 34
5、75-604:2002English 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 Luft- und
6、Raumfahrt - Elektrische Leitungen fr Luftfahrtverwendung - Prfverfahren - Teil 604: Lichtbogenfestigkeit, trocken This European Standard was approved by CEN on 27 February 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this E
7、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 Management Centre or to any CEN member. This European Standard exists in three official versions (En
8、glish, 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgar
9、ia, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR S
10、TANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3475-604:2010: EBS EN 3475-604:2010EN 3475-604:2
11、010 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Specimen requirements 54 Preparation of specimen .55 Apparatus .66 Method . 107 Requirements 12BS EN 3475-604:2010EN 3475-604:2010 (E) 3 Foreword This document (EN 3475-604:2010) has been prepared by the Aerospace and Defence Indus
12、tries Association 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 t
13、o 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 January 2011, and conflicting national standards shall be withdrawn at the latest by January 2011. Attention is drawn to the possibility that
14、 some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 3475-604:2002. According to the CEN/CENELEC Internal Regulations, the national standards organizatio
15、ns of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
16、 Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3475-604:2010EN 3475-604:2010 (E) 4 1 Scope This standard specifies a method for appraising the behaviour of cable insulation when an electric arc is initiated and maintained by two powered cables rubbing against
17、a blade. This 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 damaged by abrasion such that electrical arcing
18、 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 conditions for 230 Vac network. Unless otherwise speci
19、fied in product standard, only 115 Vac conditions shall be satisfied. Six 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-circuit phenomenon becomes dominant at low line im
20、pedances. Unless otherwise specified in the technical/product standard sizes 002, 006 and 020 cable shall be assessed. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated r
21、eferences, the latest edition of the referenced document (including any amendments) applies. EN 2350, Aerospace series Circuit breakers Technical specification EN 2702:2005, Aerospace series Aluminium alloy AL-P6061 T6 or T62 Drawn or extruded bar and section a or D 200 mm EN 3197, Aerospace series
22、Installation of aircraft electrical and optical interconnection systems 1)EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General EN 3475-302, Aerospace series Cables, electrical, aircraft use Test methods Part 302: Voltage proof test A-A-52083, Tape, lacing and
23、 tying, glass 2)1)Published as ASD STAN Prestandard at the date of publication of this standard.2)Published by: Department of Defense Industrial Supply Center, ATTN: DISC-BBEE, 700 Robbins Avenue, Philadelphia, PA 19111-5096 USA. BS EN 3475-604:2010EN 3475-604:2010 (E) 5 3 Specimen requirements Cabl
24、es 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 separate lengths of approximately 0,5 m consecutively from one length of cable, and strip each of the ends of insulation to per
25、mit 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 cables as follows: a) Form the cables in a six around one configuration as shown in Figure 1. b) Ensure that all cables are straight and geometrically p
26、arallel, and restrained by ties 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 ties at 15 mm to 20 mm spacing within the test zone. The tie material shall be PTFE glass lacing tape
27、 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: Phase C N1-N2: Inactive cables connected to ea
28、rth Figure 1 Specimen configuration BS EN 3475-604:2010EN 3475-604:2010 (E) 6 5 Apparatus 5.1 Electrical equipment Connect the seven cables of the test sample within a circuit as shown in Figure 2. This circuit shall have the following requirements: a) The provision of adjustable levels of prospecti
29、ve 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 rotary machine capable of sustaining the maximum
30、prospective fault current given in Table 1 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 currents. c) 115 Vac or 230 Vac circuit breakers shall be single pole units rated at the values speci
31、fied in Table 2. They shall have trip characteristics in accordance with EN 2350 or as required in the product specification. NOTE 1 Reference of circuit breakers used should be recorded. NOTE 2 In particular case, others ratings of thermal breaker protection could be employed in accordance with air
32、craft 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 ballast resistors shall be non-inductive and of appropriate power rating. Care shall be taken to pos
33、ition 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 circuit detectors at entry into the grounded star point. These components shall limit the standing c
34、urrent to no more than 10 % of the circuit breaker rating. g) The automatic shut down facility shall provide, upon the detection of any open circuit during test and after a 10 s delay, removal of the blade from the specimen and for electrical power to be removed. Open circuit in this case means eith
35、er a physical break in the specimen or a thermal breaker trip. NOTE In the case of the automatic shut down facility is not used, the physical break in the specimen are detected by lamps in series with the rheostat Rg. h) A heavy duty electrical bonding strap shall be connected between the blade of t
36、he 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 Rg adjusting current (I) in the circuit to a value equal to 10 % of the circuit breaker current. B
37、S EN 3475-604:2010EN 3475-604:2010 (E) 7 Key Rf Rheostat 1 Phase A 2 Phase B 3 Phase C 4 Supply protection 5 Test bundle 6 Indicators (lamp) + Rp 7 Test blade Figure 2 Test schematic circuit 5.2 Test equipment Construct an apparatus as shown diagrammatically in Figures 3, 4 and 5 which includes the
38、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 centres should hold the individual cables of the specimen in close proximity. b) Electrical
39、 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 2702:2005) and Figure 5. d) A mechanism to provide a minimum oscillating stroke of 15 mm excursion at a frequency of (8
40、2) Hz. e) A blade carrier to give a downward force at the blade of (2,5 0,1) N. f) A mechanical stop to limit the fall of the oscillating blade to within an accuracy of 0,2 mm measured at the point of contact. BS EN 3475-604:2010EN 3475-604:2010 (E) 8 g) Means of separating the blade from the specim
41、en, 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 metal and short wavelength ultra violet light. Key 1 Blade carrier guide 2 Alumini
42、um blade 3 Bundle 4 Heat insulation (e.g.: PTFE) 5 Aluminium support Figure 3BS EN 3475-604:2010EN 3475-604:2010 (E) 9 Key 1 Blade 2 Bundle 3 Stop 4 Cable tie 5 Spring 6 Contact pressure adjustment 7 Depth adjustment shim Figure 4 Key 1 Sharpen edge with 60 grit aluminum disc sander directed “toward
43、s the blade“ (i.e. to avoid feathered edge) 2 Aluminium square (10 mm) Figure 5 BS EN 3475-604:2010EN 3475-604:2010 (E) 10 5.3 Test protocol 5.3.1 The procedure embraces copper cable sizes 001 to 050 (26 to 10) or aluminium cable sizes 002 to 090 (24 to 8), and for each cable size six values of pros
44、pective fault current have been defined. Performance of a cable size at a given fault intensity shall be determined by testing three 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. Additional t
45、esting 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 and the blade form to be employed have been included in this specification. 5.3.3 It is emphasized that electrical a
46、rcing tests are essentially destructive 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, i). The use of video recording for all tests is required. 5.4 Test rig set-up 5.4.1 Install the rating
47、of circuit breaker appropriate to the cable type and size to be tested (Table 2). Fit a blade to the reciprocating head of the test rig of the appropriate type shown in Figures 3 and 4. 5.4.2 Heavy duty electrical shorting connections shall be fitted in substitution of a test sample to enable prospe
48、ctive fault currents to be set by adjustment of resistances Rf. Because these currents would trip the thermal breakers very rapidly these shall be shunted to permit the pulsing of current until the desired value is obtained. Re-instate the thermal protection. 5.4.3 With electrical power removed adju
49、st the test apparatus to give the correct conditions of blade stroke, frequency and downwards force. Ensure that the test fixture is correctly positioned and that the method of holding the specimen provides satisfactory restraint. 5.4.4 Modify a verification sample by removing a section of cables A1 and B1 in the test zone. Adjust the blade depth stop such that the final blade position is at least half the conductor diameter of A1 or B1, from wires A2, B2 and C1, as shown by Figur
