1、BRITISH STANDARDBS EN 3475-302:2006Aerospace series Cable, electrical, aircraft use Test methods Part 302: Voltage proof testThe European Standard EN 3475-302:2006 has the status of a British StandardICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g
2、50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3475-302:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 September 2006 BSI 2006ISBN 0 580 49156 0National forewordThis
3、 British Standard was published by BSI. It is the UK implementation of EN 3475-302:2006. It supersedes BS EN 3475-302:2002 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Subcommittee A
4、CE/6/-/2, Aerospace Cables.A list of organizations represented on ACE/6/-/2 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.Compliance with a British Standard cannot
5、 confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3475-302May 2006ICS 49.060 Supersedes EN 3475-302:2002 English VersionAerospace series - Cable, electrical, aircraft use - Test methods- Part 302: Voltag
6、e proof testSrie arospatiale - Cbles lectriques usagearonautique - Mthodes dessais - Partie 302 : Tenue entensionLuft- und Raumfahrt - Elektrische Leitungen frLuftfahrtverwendung - Prfverfahren - Teil 302:SpannungsfestigkeitThis European Standard was approved by CEN on 13 January 2006.CEN members ar
7、e bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to th
8、e Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status
9、 as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slov
10、enia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN nati
11、onal Members.Ref. No. EN 3475-302:2006: EEN 3475-302:2006 (E) 2 Contents Page Foreword 3 1 Scope .4 2 Normative references .4 3 Immersion test 4 4 Dry spark test (in production)4 5 Dry impulse test (test in production as an alternative to 4).5 6 Voltage test of components (screened cables) 6 EN 3475
12、-302:2006 (E) 3 Foreword This European Standard (EN 3475-302:2006) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval
13、of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to 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 November 2006, and confli
14、cting national standards shall be withdrawn at the latest by November 2006. Attention is drawn to the possibility that 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 Europ
15、ean Standard supersedes EN 3475-302:2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hu
16、ngary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3475-302:2006 (E) 4 1 Scope This standard specifies a method of performing voltage proof tests on finished c
17、ables and cables in course of production. It shall be used together with EN 3475-100. 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 references, the latest edition of
18、the referenced document (including any amendments) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General. 3 Immersion test The specimens, each 15 m long, shall be immersed in the solution so that their ends are at least 150 mm from the surface of the
19、solution. The composition of the solution, at a temperature of between 15 C and 25 C, shall be as follows: sodium chloride 30 g distilled water 1 000 g wetting agent 2 g After immersion for 1 h, the voltage specified by the technical specification with a frequency of 40 Hz to 60 Hz, shall be applied
20、 between the conductor of the cable and the screen, if present, or an electrode in contact with the liquid for 5 min. Single and multicore (jacketed) without shield: between the conductor(s) and an electrode in contact with the liquid Shielded and jacketed cables between the shield and an electrode
21、in contact with the liquid The voltage rise time shall be between 300 V per second and 500 V per second. There shall be no perforation of the insulation or jacket. 4 Dry spark test (in production) All the finished cables shall pass, without flash-over, through the electrode of a suitable dry tester,
22、 at the voltage stated in the technical specification at a frequency of 40 Hz to 60 Hz. The electrode consists of an assembly of small chains or other metallic feelers suitable for making close contact with practically the whole surface of the cable. The length of the electrode and speed of the cabl
23、e shall be such that each portion of the insulation or jacket is subjected to the test voltage for at least 0,20 s. EN 3475-302:2006 (E) 5 The voltage shall be applied: Single and multicore (jacketed) without shield: between the conductor(s) and the electrode Shielded and jacketed cables between the
24、 shield and the electrode There shall be no perforation of the insulation or jacket. NOTE If a defect is found, a minimum length of 30 mm shall be cut away from each side of the defective point. 5 Dry impulse test (test in production as an alternative to 4) Apparatus The electrode through which the
25、cable passes when subjected to the voltage test shall be formed of beaded chains so that effectively the whole surface of the cable insulator is in contact with the beads. The characteristics and ancillary apparatus of the impulse test shall be as follows. Impulse test The form of the signal shall b
26、e negative pulse with a peak value of the cable test voltage followed by a damped oscillation. The peak voltage is stated in the technical specification. The rise time of the negative pulse of the signal between 0 % and 90 % of the peak voltage specified shall not be greater than 75 s. The peak valu
27、e of the first positive overshoot of the signal and each of the damped oscillations which flow from it shall be less than the initial negative pulse. The time during which each pulse and its damped oscillation (positive and negative) remain at a voltage equal to 80 % or higher than the specified pea
28、k voltage shall be between 20 s and 100 s. The pulse rate shall be between 200 pulses and 500 pulses per second inclusive. Apart from regulation of the peak voltage, conformity with the impulse test parameters shall be defined without capacitance load applied to the electrode. Capacity tolerance As
29、far as the capacitive load is concerned, the suitable tolerance for the apparatus shall be such that where there is an increase in the capacitive load between electrode and earth, the peak voltage shall not be reduced by more than 12 % from an initial load of 12,5 pF/25 mm to 25 pF/25 mm electrode l
30、ength. Voltmeter A voltmeter allowing continuous reading of the voltage at the electrode terminals is connected. The voltmeter shall be capable of showing a total deviation for a voltage not exceeding 15 kV and shall be accurate to within a minimum of 4 % of the test voltage. Error detection circuit
31、 The test apparatus shall consist of an error detection circuit with visual or audible indication of an insulation fault automatically cutting off the supply to the electrode and stopping the passage of the cable. The detection circuit shall be sensitive enough to show the fault at 75 % of the speci
32、fied test voltage when an arc occurs between the electrode and earth through a resistance of 20 k; it shall also be capable of detecting a fault with a duration corresponding to that of a pulse. EN 3475-302:2006 (E) 6 Calibration of apparatus The voltmeter shall be calibrated by comparison with anot
33、her voltmeter capable of detecting the peak voltage of the electrode with or without auxiliary circuit. During calibration, the calibrated voltmeter shall be directly connected to one of the electrodes or through a calibrated attenuator circuit. The pulse generator shall be switched on and the contr
34、ol voltage of the generator regulated until the voltage reading on the calibrated voltmeter corresponds to the specified voltage; at this moment the voltage reading on the voltmeter to be calibrated shall be noted. The calibration shall be repeated for each peak voltage at which it is intended to op
35、erate the equipment. A calibrated oscilloscope can also be used connected to the electrode through an attenuator. Thus the value of the negative pulse peak can be read directly on the wave form indicator. An oscilloscope connected to the electrode at appropriate different points can also be used to
36、check the conformity of the other waveform parameters specified for the impulse test. Method The finished cable shall be passed through the electrode and the conductor(s) earthed at one or both ends. The voltage shall be applied: Single and multicore (jacketed) without shield: between the conductor(
37、s) and the electrode Shielded and jacketed cables between the shield and the electrode The electrode shall be supplied with the specified voltage and after a final voltage adjustment the cable shall be passed from the pay-off reel to the take-up reel through the electrode. The line speed shall be su
38、ch that the cable is subjected to no fewer than three pulses and no more than 100 pulses at any given point. During the test, which includes the insertion of new lengths of cable, the cable shall be tested over its total length, including the ends, complying with the procedure. Any ends or other par
39、ts of the cable not tested in accordance with this method shall be withdrawn. There shall be no perforation of the insulation or jacket. NOTE If a defect is found, a minimum length of 50 mm shall be cut away from each side of the defective point. 6 Voltage test of components (screened cables) The ca
40、bles shall be subjected to a voltage test at ambient temperature. The r.m.s. value of the voltage shall be specified in the technical specification at a frequency between 40 Hz and 60 Hz. The voltage shall be applied for at least 1 min between one component and the other components and the screen co
41、nnected together. There shall be no perforation of the insulation. blankBS EN 3475-302:2006BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the
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