EN 2591-326-2018 Aerospace series - Elements of electrical and optical connection - Test methods - Part 326 Fire immersion test.pdf

1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Aerospace series - Elements of electrical and optical connection - Test methodsPart 326: Fire immersion testBS EN 2591326:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2591-326 August 2018 ICS 49.060 English

2、Version Aerospace series - Elements of electrical and optical connection - Test methods - Part 326: Fire immersion testSrie arospatiale - Organes de connexion lectrique et optique - Mthodes dessais - Partie 326 : Immersion au feu Luft- und Raumfahrt - Elektrische und optische Verbindungselemente - P

3、rfverfahren - Teil 326: Feuereintauchtest This European Standard was approved by CEN on 13 May 2018. 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

4、-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 any other language made by trans

5、lation 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 Republic, Denmark, Estonia, Finlan

6、d, 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. EUROPEAN COMMITTEE FOR STANDAR

7、DIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2591-326:2018 ENational forewordThis B

8、ritish Standard is the UK implementation of EN 2591326:2018. The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology.A list of organizations represented on this committee can be obtained on request to its secretary.T

9、his 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 2018ISBN 978 0 580 99700 6ICS 49.060Compliance with a British Standard cannot confer im

10、munity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 2591326:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM

11、EN 2591-326 August 2018 ICS 49.060 English Version Aerospace series - Elements of electrical and optical connection - Test methods - Part 326: Fire immersion testSrie arospatiale - Organes de connexion lectrique et optique - Mthodes dessais - Partie 326 : Immersion au feu Luft- und Raumfahrt - Elekt

12、rische und optische Verbindungselemente - Prfverfahren - Teil 326: Feuereintauchtest This European Standard was approved by CEN on 13 May 2018. 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 n

13、ational 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 versions (English, French, German). A

14、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, Belgium, Bulgaria, Croatia, Cypru

15、s, 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 Uni

16、ted Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No

17、. EN 2591-326:2018 EBS EN 2591326:2018EN 2591-326:2018 (E) 2 Contents Page European foreword 3 1 Scope 3 2 Normative references 4 3 Test method 4 4 Preparation of specimens 5 5 Apparatus. 7 6 Test fixtures 11 7 Testing 12 8 Inspection after tests . 15 Annex A (normative) Monitoring diagram . 16 BS E

18、N 2591326:2018EN 2591-326:2018 (E) 3 European foreword This document (EN 2591-326:2018) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard

19、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 publication of an identical text or by endorsement, at the latest by F

20、ebruary 2019, and conflicting national standards shall be withdrawn at the latest by February 2019. 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 responsible for identifying any or all such patent rights. A

21、ccording 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germ

22、any, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. BS EN 2591326:2018EN 2591-326:2018 (E) 4 1 Scope This European Standard specifies a

23、method of determining a components resistance to a liquid fuelled fire and the elements of connection. It shall be used together with EN 2591-100. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of th

24、is document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2234, Aerospace series Cable, electrical, fire resistant Technical specification EN 2591-100, Aerospace series Elements of e

25、lectrical and optical connection Test methods Part 100: General EN 2591-202, Aerospace series Elements of electrical and optical connection Test methods Part 202: Contact resistance at rated current EN 2997 (all parts), Aerospace series Connectors, electrical, circular, coupled by threaded ring, fir

26、e-resistant or non fire-resistant, operating temperatures 65 C to 175 C continuous, 200 C continuous, 260 C peak EN 3645 (all parts), Aerospace series Connectors, electrical, circular, scoop proof, triple start threaded coupling, operating temperature 175 C or 200 C continuous EN 3660 (all parts), A

27、erospace series Cable outlet accessories for circular and rectangular electrical and optical connectors ISO 2685, Aircraft Environmental test procedure for airborne equipment Resistance to fire in designated fire zones 3 Terms and definitions No terms and definitions are listed in this document. ISO

28、 and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp 4 Test method EN 2591-326 is composed of two tests on 2 sample groups: 1) Liqu

29、id fuelled fire immersion test: The purpose of this test is to verify the ability of a couple of connectors installed in the same area, to sustain a fire for at least 5 min, without electrical discontinuity. BS EN 2591326:2018EN 2591-326:2018 (E) 5 2) Liquid fuelled fire containment test: The purpos

30、e of this test is to verify the ability of a couple of connectors installed on a wall dividing 2 areas, to sustain a fire for at least 5 min, without electrical discontinuity and to contain the flame on the side exposed to fire for 20 min. 5 Preparation of specimens 5.1 Layout For EN 2997: 8-06 for

31、contact size 22; 10-06 for contacts size 20; 18-08 for contact size 12; 24-30 for contact size 16. In case of non-availability of one or more of above mentioned layout, equivalent layouts will be assessed and justified by the mandated body representative. For EN 3645: 9-35 for contact size 22; 11-98

32、 for contacts size 20; 17-06 for contact size 12; 23-21 for contact size 16; 21-48 for contacts size 8. In case of non-availability of one or more of above mentioned layout, equivalent layouts will be assessed and justified by the mandated body representative. 5.2 Specimen preparation 5.2.1 Model wi

33、thout integrated accessory The connector shall be fitted with a straight backshell, unsealed with clamp strain relief type EN 3660-XXX or equivalent on both sides. Cables in the area between the clamps and rear grommet shall be exposed to the flame without protection, see Figure 1 and Figure 2. Glas

34、s fibre sheath or equivalent shall be installed where the cables contact the clamp, to avoid any electrical breakdown in this area. Cables shall be clamped between 200 mm to 250 mm of the rear of the grommet in both sides. BS EN 2591326:2018EN 2591-326:2018 (E) 6 Figure 1 Figure 2 5.2.2 Model with i

35、ntegrated accessory Cables and rear grommet shall be exposed to the flame without protection and without a metallic braid. See Figure 3. Cables shall be clamped between 200 mm to 250 mm of the rear of the grommet in both sides of the test assembly. Figure 3 5.3 Wiring Specimens shall be wired with c

36、able bundles 450 mm min. in length. All cavities shall be fitted with wired contacts. Two circuits shall be connected in series, one using the even-numbered contacts and the other using the odd-numbered contacts, see Figure A.1. In case of alphabetical identification of contact cavities, the followi

37、ng rule shall apply: A, C, E, G are considered odd number contacts; B, D, F, H are considered even number contacts. BS EN 2591326:2018EN 2591-326:2018 (E) 7 5.4 Recommendation Unless specified in the technical specification, the following details shall be stated: mounting method, type of fire-resist

38、ant cable (EN 2234 or MIL qualified equivalent) and definition of specimen wiring; initial measurements (if applicable); value of leakage current (phase 1); nominal current to be applied to contacts (phase 1); Angle and position of burner. 6 Apparatus 6.1 General The rig shall allow movement/rotatio

39、n of the burner between the calibration and test phases, without turning off the burner, nor modifying the intended distance and relative positioning of the specimen. See Figure 4. The spatial positioning of the burner shall ensure that the centre of the temperature measuring tool and the centre of

40、the heat flux measuring tool are within a tolerance from the centre of the expected impinged specimen surface. The distance “X” from the burner nozzle to the connector shall be calibrated according to ISO 2685 (see 5.2). Figure 4 Example of fuel burner providing the standard flame 6.2 Burner calibra

41、tion 6.2.1 General The temperature calibration of the burner consists of adjusting the mixing ratio of air and combustible, until the flame is delivering a standard flame. A flame is characterized by its temperature and its heat flux. As the quantitative value is directly dependent on the instrument

42、ation, it is necessary to respect a common tool to ensure uniformity between tests. BS EN 2591326:2018EN 2591-326:2018 (E) 8 The overall calibration process shall consist of the following operations (see Figure 5): Positioning of the specimen (distance X and Y); Flame Temperature calibration and sta

43、bilization; Heat flux calibration and stabilization. Key 1 Flame temperature calibration (see Figure 6 and Figure 7) 2 Heat flux calibration (see Figure 8) 3 Position for test 4 Specimen 5 Temperature calibration 6 Heat flux calibration 7 Temperature calibration, 7 thermocouples X 100 mm 10 % Y 25 m

44、m 10 % Figure 5 Example of burner calibration process BS EN 2591326:2018EN 2591-326:2018 (E) 9 6.2.2 Flame temperature measurement Burner flame temperature is adjusted by increasing or decreasing the air and liquid flows. The flame temperature is measured with 7 (seven) thermocouples type K (Ni-Cr/N

45、i-Al) positioned over a metallic support at regular intervals of (25 1) mm. The distance between the burner nozzle and the thermocouples is X = 100 mm 10 %. The thermocouples shall be positioned at a height of Y = 25 mm 10 % over the axial centreline of the burner. For each thermocouple, the flame t

46、emperature shall be over 1 020 C. Short excursions above 1 180 C are permissible provided the average temperature remains within the range 1 020 C to 1 180 C. The 7 (seven) thermocouples measuring points issued from the comb flame temperature recording shall be (1 100 80) C. 6.2.3 Temperature sensor

47、 disposal Due to its flame shape, it is accepted for only a liquid fuel burner, to perform the calibration with 7 (seven) thermocouples aligned as shown in Figures 6 and 7. For a liquid fuel burner, the temperature measurement is acceptable with a line of 7 (seven) measuring points aligned within th

48、e symmetrical line of the area impingement, spaced with a 25 mm pitch. For a liquid fuel burner, the temperature measurement is acceptable if each of the 7 (seven) thermocouples measures a temperature of (1 100 80) C over a 2 min period. Figure 6 Temperature sensor disposal BS EN 2591326:2018EN 2591

49、-326:2018 (E) 10 Key 1 Kerosene Burner Cowl 2 7 off thermocouples equally spaced 25 mm ( 2) apart Horizontal and vertical centrelines shall be within 2 mm of true position. aabove burner centre line Figure 7 Thermocouple layout 6.2.4 Heat flux density calibration Burner is calibrated by using the continuous flow calorimeter apparatus show here after. A constant head of water (from the domestic network) shall ensure consistent flow conditions. A