ASD-STAN PREN 6059-504-2012 Aerospace series Electrical cables installation Protection sleeves Test methods Part 504 Temperature rise within a loom due to self-heating when within .pdf

1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 6059-504 Edition P 1 June 2012 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: Descriptors: ENGLISH

2、VERSION Aerospace series Electrical cables, installation Protection sleeves Test methods Part 504: Temperature rise within a loom due to self-heating when within a protective sleeve Srie arospatiale Cbles lectriques, installation Gaines de protection Mthodes dessais Partie 504 : Augmentation de temp

3、rature due lauto-chauffement dun faisceau de cbles avec gaine de protection Luft- und Raumfahrt Elektrische Leitungen, Installation Schutzschluche Prfverfahren Teil 504: Temperaturanstieg durch Selbsterwrmung des Leitungsbndels innerhalb des Schutzschlauchs This “Aerospace Series“ Prestandard has be

4、en 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 been technically approved by the experts of the concerned Domain following member comments. Subseq

5、uent 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 standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitte

6、d 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 to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any

7、national standards conflicting with the EN. Edition approved for publication 30 June 2012 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2012 by ASD-STAN prEN 6059-504:2012 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative reference

8、s 3 3 Equipment 3 4 Preparation of test specimens .3 5 Test methods 4 6 Acceptance criteria 6 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs Ge

9、neral Process Manual, this standard has received approval for Publication. prEN 6059-504:2012 (E) 3 1 Scope This standard specifies methods of assessing the behaviour and temperature increase of cable loom when fitted with protection sleeves or conduits subject to normal and fault currents. It shall

10、 be used together with EN 6059-100. 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 the referenced document (including any amendments)

11、 applies. EN 6059-100, Aerospace series Electrical cables, installation Protection sleeves Test methods Part 100: General 3 Equipment The following equipment shall be required for these tests: a) The test shall be carried out at ambient temperature in a chamber where the whole unit shall be sheltere

12、d from draughts. An extraction shall be provided but only operated after completion of the test. b) To identify the appearance of smoke, a screen with black and white horizontal bands or any other device shall be used. 4 Preparation of test specimens The test shall be carried out at ambient temperat

13、ure Ta(typically 20 C) in a chamber where the whole unit shall be sheltered from draughts. An extraction shall be provided but only operated after completion of the test. To identify the appearance of smoke, a screen with black and white horizontal bands or any other device shall be used. Means of e

14、lectrical power connection at both extremities shall not provide any risks of temperature increase. A 3 m long cable loom 1)shall be laid up using air frame cables, whos maximum temperature rating is at least that of the sleeve material being tested, so that it forms a concentric bundle. The looms c

15、onductors shall be wired in series so as to ensure that at the same current passes through each conductor. The resulting loom shall be of such a diameter that it fully fills the protective sleeve being tested. A means shall be provided so that the voltage drop across the centre conductor can be moni

16、tor over a length of at least 1,5 m (the test zone). 1) The temperature rating of the cables insulation shall be at least as high as that of the sleeve being tested. prEN 6059-504:2012 (E) 4 5 Test methods 5.1 Method 1 5.1.1 Principle Assessment of the increase in temperature caused by fitting prote

17、ctive sleeve over a cable loom (heat transfer ration). 5.1.2 Procedure Suspend the cable loom (without the protective sleeve being fitted) so that at least the central 2 m section, including the test zone is horizontal and unsupported. Suspend a weight from the ends of the cable in order to reduce s

18、agging throughout the test Figure 1. Apply a small electric current 2)Isothe conductor and measure the voltage drop over test zone V20. Calculate the loom resistance R20.Now increase the current so as tisignificantly warm the loom by approximately 40C. Record the new current ITand voltage drop value

19、s Vt. Using these values calculate the resistance of the wire conductor RT. The temperature T (in C) of the wire conductor is determined from the change in resistance, using the following formula: 112020tRRTwhere Rtis the resistance (in ) of the conductor at temperature T; R20is the resistance (in _

20、) of the conductor at 20 C; T is the temperature of the conductor (in C); see Table 1. Table 1 Base metal Copper alloy Copper Aluminium 0,003 5 0,004 0,004 Adjust the current so that the conductor temperature stabilizes at a temperature 40 C above ambient. Maintain this temperature TAfor 30 min. and

21、 record the current that is being applied IA to maintain it. 2) This current should not be so low that it does not increase the loom temperature. prEN 6059-504:2012 (E) 5 The loom is now to be fitted with a length of over sleeve sufficiently long so as to completely cover the loom beyond the two vol

22、tage pick off points. The current IAis to be reapplied and after 30 min the loom temperature TBcalculated. The protective sleeves heat transfer ratio shall now be calculated using the following formula: Heat transfer ratio 100bATT5.2 Method 2 5.2.1 Principle Assessment of internal overheating of a p

23、rotective sleeve by the loom within. 5.2.2 Procedure Suspend the cable loom (without the protective sleeve being fitted, so that at least the central 2 m section, including the test zone is horizontal and unsupported. Suspend a weight from one end of the cable in order to reduce sagging throughout t

24、he test. Apply a small electric current 2)Isothe conductor and measure the voltage drop over test zone V20. Calculate the loom resistance R20.Now fit the protective sleeve with a length of over sleeve sufficiently long so as to completely cover the loom beyond the two voltage pick off points. Raise

25、the current within the loom so as to raise the temperature of the cable loom to value of the maximum rated temperature of the protective sleeve material T1. Record the new current ITand voltage drop values Vt. Using these values calculate the resistance of the wire conductor RT. The temperature T (i

26、n C) of the wire conductor is determined from the change in resistance, using the following formula: 112020tRRTwhere Rtis the resistance (in ) of the conductor at temperature T; R20is the resistance (in _) of the conductor at 20 C; T is the temperature of the conductor (in C); see Table 1. Now raise

27、 the loom temperature to a value T2which is 30 C above the maximum rated temperature of the protective sleeve material. This temperature is to be maintained for 15 min. prEN 6059-504:2012 (E) 6 6 Acceptance criteria 6.1 Method 1 The heat transfer ratio shall not exceed the value specified in the pro

28、duct standard. 6.2 Method 2 At temperature T1there shall be no indication of visible smoke, or smell or appreciable colour change to the protective sleeve. At temperature T2there shall be no indication of spontaneous combustion. After cooling from temperature T2to ambient there shall be no indication of separation and/or embrittlement of the protective sleeve. Key 1 Test zone Figure 1 Test fixture