ASD-STAN PREN 2591-318-2017 Aerospace series Elements of electrical and optical connection Test methods Part 318 Fire-resistance (Edition P 1).pdf

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1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 2591-318 Edition P 1 April 2017 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: Will supersede EN 2

2、591-318:1998 Descriptors: ENGLISH VERSION Aerospace series Elements of electrical and optical connection Test methods Part 318: Fire-resistance Luft- und Raumfahrt Elektrische und optische Verbindungselemente Prfverfahren Teil 318: Feuerbestndigkeit Srie arospatiale Organes de connexion lectrique et

3、 optique Mthodes dessais Partie 318 : Rsistance au feu This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has b

4、een technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the stan

5、dard. After examination and review by users and formal agreement of ASD-STAN, the ASD-STAN prEN will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then

6、to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. ASD-STAN Technical Committee approves that: “This document is published by ASD-STAN for the needs of the European Aerospace Industry. The use of

7、 this standard is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” ASD-STAN reviews each standard and technical report at least every five years at which time it may be revi

8、sed, reaffirmed, stabilized or cancelled. ASD-STAN invites you to send your written comments or any suggestions that may arise. All rights reserved. No parts of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photo

9、copying, recording, or otherwise, without prior written permission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web address: http:/www.asd-stan.org/ Edition approved for publication 1st April 2017 Comments should be sent within six months after the date of publication to ASD-STAN Electrical

10、 Domain Copyright 2017 ASD-STAN prEN 2591-318:2017 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Preparation of specimens 3 4 Apparatus. 6 5 Method 12 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and vot

11、es carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 2591-318:2017 (E) 3 1 Scope This standard specifies a method of determining fire-resistance of elements of connection. It shall be used toget

12、her with EN 2591-100. 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 referenced documen

13、t (including any amendments) applies. EN 2234, Aerospace series Cable, electrical, fire resistant Technical specification EN 2591-100, Aerospace series Elements of electrical and optical connection Test methods Part 100: General EN 2997 (all parts), Aerospace series Connectors, electrical, circular,

14、 coupled by threaded ring, fire-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 c

15、ontinuous EN 3660 (all parts), Aerospace 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 Preparation of specimens 3.1 Layouts For EN 299

16、7: 8-06 for contact size 22; 10-06 for contact 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 mandated body representative. For EN 3645: 9-35 for contact size 22

17、; 11-98 for contact size 20; 17-06 for contact size 12; 21-48 for contact size 8; 23-21 for contact size 16. prEN 2591-318:2017 (E) 4 In case of non-availability of one or more of above mentioned layout, equivalent layouts will be assessed and justified by mandated body representative. 3.2 Specimen

18、preparation 3.2.1 Model without integrated accessory Figure 1 Figure 2 The connector shall be fitted with straight backshell, unsealed with clamp strain relief type EN 3660-XXX or equivalent on both sides of the assembly. Cables in the area between the clamps and rear grommet shall be exposed to the

19、 flame without protection, see Figure 1 and Figure 2. Glass fibre sheath or equivalent shall be installed where the cables contact the clamp, to avoid any electrical breakdown in this area. 3.2.2 Model with integrated accessory Cables and rear grommet shall be exposed to the flame without protection

20、 or metallic braid with no load or strain on the cable/contact assembly. 3.3 Wiring Specimens shall be wired with cable 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

21、 the odd-numbered contacts, see Figure 9. In case of alphabetical identification of contact cavities, the following rule shall apply: A = 1, B = 2, etc. Cables shall be clamped between 200 mm to 250 mm of the rear of the grommet on both sides of the assembly. prEN 2591-318:2017 (E) 5 3.4 Test requir

22、ements Unless specified in the technical specification, the following details shall be stated: mounting method, type of fire-resistant cable (e. g. EN 2234) and definition of specimen wiring; initial measurements (if applicable); value of leakage current (phase 1); nominal current to be applied to c

23、ontacts (phase 1); position of burner, see Figure 4, Figure 5 and Figure 6; diameter “D”, see Table 1. According to ISO 2685 the major cross section “A” and the area of the flame at the nozzle of the burner “B” are linked by the following formula: A 2B for an illustration of the major cross section,

24、 see Figure 3. Key 1 Burner diameter D 2 “Shadows” of specimen 3 Plane parallel to burner Nozzle 4 Specimen 5 Bracket 6 Support plate 7 Plug 8 Major cross section = A Major cross section = Area of the specimen (plug) projected onto a plane placed at 45. Figure 3 Major cross section For burner diamet

25、er, see Table 1. prEN 2591-318:2017 (E) 6 Table 1 Minimum burner diameter vs major cross section Connector type Layout Major cross section (connector shadow) A mm2 Burner diameter minimum D mm EN 2997 8-06 577 19 10-06 708 21 18-08 1290 29 24-30 1912 35 EN 3645 9-35 559 19 11-98 689 21 17-06 1221 28

26、 21-48 1495 31 23-21 1727 33 For the cross section of connectors not called-up in Table 1, the minimum burner diameter shall be calculated and agreed with the Mandated Body prior to testing. 4 Apparatus 4.1 General The rig shall allow the burner to move/rotate between the calibration and the assembl

27、ed test samples, without turning off the burner or modifying the intended distance and relative position of the test sample. The distance from the burner nozzle to the connector dimension “h”, see Figure 4, shall be calibrated according to ISO 2685. 4.2 Setup The mated specimens shall be rear mounte

28、d on a steel sheet representative of a firewall as shown in Figure 4, Figure 5 and Figure 6. The assembly shall be rigidly secured to a vibration generator. The circuits shall be connected to an electrical installation as shown in Figure 9. The position of the thermocouple(s) relative to both the bu

29、rner and test sample during the test period, shall be identical to the thermocouple position achieved relative to both the burner and calibration tube during calibration of the assembly. The angle and direction of the burner and flame shall be the same as utilised during calibration. See Figure 4 an

30、d Figure 6. prEN 2591-318:2017 (E) 7 Key 1 Tip of thermocouple here - 6 mm to 7 mm between the thermocouple sensor tip and the test specimen 2 Stiffening frame 3 Plug 4 Receptacle 5 Wiring support 6 250 mm x 250 mm (approximately) 7 Vibration table 8 Support plate, see Figure 7c for an example of a

31、typical plate 9 Receptacle flange 10 Reinforcing plate 11 Connector mounting plate, see Figure 7b for an example of a typical plate (steel sheet: 1 mm to 1,5 mm) 12 Burner A Diameter of the flame at the burner nozzle exit NOTE “h” is in relation with the flame calibration, see ISO 2685. Figure 4 Typ

32、ical test setup Flame shall be pointed towards the rear of the connector, any angular position 90 from bottom of vertical axis of the connector, see Figure 6. prEN 2591-318:2017 (E) 8 Key 1 Burner 2 Vibration direction (unless otherwise specified by the product standard) 3 Vibration table Figure 5 T

33、est setup Key 1 Connector 2 Burner 3 90 max (shall remain below the horizontal plane) Figure 6 Burner attitude options prEN 2591-318:2017 (E) 9 Key 1 15,24 rad. 2 5,28 / 5,13 dia. (17 required) (see hole pattern) NOTE Thermal barrier sheet required to prevent destructive heat transfer to vibration e

34、quipment. a) Thermal barrier sheet Key 1 254 x 254 x 3,18 mild steel 2 5,28 / 5,13 dia. (12 required ) (see hole pattern) 3 8,53 x 8,36 dia. (2 required) 4 “A” hole shall provide suitable clearance for the applicable connector 5 “B” connector mounting holes shall be as specified for the connector b)

35、 Connector mounting plate prEN 2591-318:2017 (E) 10 Key 1 254 x 177,80 x 12,70 mild steel 2 15,24 rad. 3 5,28 x 5,13 dia. (17 required) (see hole pattern) c) Support plate Key 1 5,28 x 5,13 dia. (typ.) (ref.) d) Hole pattern Figure 7 Example of a firewall connector fixture details prEN 2591-318:2017

36、 (E) 11 Figure 8 Firewall connector fixture assembly Key 1 Insulation transformer 2 0 A to 5 A 3 Power supply 28 V DC, 2A continuous 4 Adjustable resistor 5 0 mA to 100 mA 6 Power supply AC 230 V between phase, AC 115 V between phase and neutral 7 Connector shell Figure 9 Schematic diagram prEN 2591

37、-318:2017 (E) 12 4.3 Flame Flame shall be in accordance with ISO 2685. The temperature of the flame shall be checked before the test according to ISO 2685. The burner flame temperature during the test at the thermocouple tip shall be greater than the minimum required temperature or the burner post-t

38、est calibration shall produce a flame having the characteristics of the standard flame. 5 Method 5.1 Initial measurements (if applicable) Initial measurements (if applicable). 5.2 Procedure 5.2.1 General The specimens shall be simultaneously exposed to the flame and vibration at a constant frequency

39、 between 30 Hz and 60 Hz of 100 m/s acceleration throughout the phases of the test unless otherwise specified in the product standard. 5.2.2 Phase 1 During the first 5 min, the contacts shall carry a constant current of the specified nominal value: switch 1 is closed, switch 2 is open (see Figure 9)

40、. After the fifth minute, a potential of 200 Vrms. to 260 Vrms., 40 Hz to 60 Hz, shall be applied for 1 min between each of the circuits and 100 V to 130 V potential between each circuit and the housing (shell): switch 2 is closed, switch 1 is open (see Figure 9). 5.2.3 Phase 2 The flame shall be ap

41、plied for a further 14 min, with no voltage on the circuits. 5.3 Requirements 5.3.1 Phase 1 There shall be no electrical discontinuity during the first 5 min and no leakage current higher than the specified value during the sixth minute. 5.3.2 Phases 1 and 2 No flame shall be visible on the side of the specimen not exposed to the burner when viewed from the rear of the receptacle along the axis of the test assembly.