ASD-STAN PREN 6059-502-2013 Aerospace series Electrical cables installation Protection sleeves Test methods Part 502 Resistance to electrical arcs (Edition P 2).pdf

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1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 6059-502 Edition P 2 January 2013 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONRue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: Supersedes edition P 1 of Fe

2、bruary 2009 and will supersede EN 6059-502:2009Descriptors: ENGLISH VERSION Aerospace series Electrical cables, installation Protection sleeves Test methods Part 502: Resistance to electrical arcs Srie arospatiale Cbles lectriques, installation Gaines de protection Mthodes dessais Partie 502 : Rsist

3、ance aux arcs lectriques Luft- und Raumfahrt Elektrische Leitungen, Installation Schutzschluche Prfverfahren Teil 502: Lichtbogenfestigkeit This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standar

4、dization). 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. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangea

5、bility 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 submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformati

6、on 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 national standards conflicting with the EN. Edition approved for publication 31 January 2013 Comments should be sent w

7、ithin six months after the date of publication to ASD-STAN Electrical Domain Copyright 2013 by ASD-STAN prEN 6059-502:2013 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Specimen requirements 3 4 Definition and preparation of specimen 4 4.1 Protected bundle (bundle P) .4 4.2 Agg

8、ressive bundle (bundle A) 4 4.3 Test configuration7 5 Apparatus .8 5.1 Electrical equipment 8 5.2 Test equipment 10 5.3 Test protocol 10 5.4 Test rig set-up 10 6 Method 11 6.1 Test Procedure .11 6.2 Examination 12 6.3 Test report 12 7 Requirements .12 Foreword This standard was reviewed by the Domai

9、n 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 General Process Manual, this standard has received approval for Publication. prEN 6059-502:2013 (E) 3 1 Scope This standard specifies a method o

10、f assessing the behaviour of protection sleeves or conduits subject to an external electric arc, either at 115 Vac or 230 Vac 400 Hz. This Standard shall be used together with EN 6059-100. The primary aim of this test is to produce, in a controlled fashion, electric arcs at the immediate vicinity of

11、 a protection sleeve or conduit and to examine possible consequences on cables inside this protection, which are supposed to be maintained in a safe condition. These electric arcs are representative of those, which may occur in service when a typical cable bundle is severely damaged. In order to opt

12、imize thickness and mass of such protection, it is necessary to associate a current limit In to each sleeves or conduits construction. Two levels of prospective fault current are specified for all protection sizes. 2 Normative references The following referenced documents are indispensable for the a

13、pplication of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2267-010, Aerospace series Cables, electrical, for general purpose Operating temperatures between 55 C and 2

14、60 C Part 010: DR family, single UV laser printable Product standard EN 2350, Aerospace series Circuit breakers Technical specification EN 3475-302, Aerospace series Cables, electrical, aircraft use Test methods Part 302: Voltage proof test EN 6059-100, Aerospace series Electrical cables, installati

15、on Protection sleeves Test methods Part 100: General EN 6059-501, Aerospace series Electrical cables, installation Protection sleeves Test methods Part 501: Voltage proof test A-A-52083, Specification for tape lacing and tying 1) 3 Specimen requirements Protection sleeves or conduits to be tested sh

16、all be of traceable origin and, unless otherwise specified, shall have passed the voltage proof test (EN 6059-501) as defined in the concerned product standard. Unless otherwise specified in the concerned technical product standard, at least one size of protection sleeve per sleeve thickness or cons

17、truction type (if different from one size to another) shall be assessed. If possible for each thickness or construction type the test must be performed on a sample having the minimum authorized thickness or minimum authorized mass. 1) Published by: Customer Service, Defense Printing Service Detachme

18、nt Office, 700 Robbins Ave, Building 4D, Philadelphia PA 19111-5094 USA. prEN 6059-502:2013 (E) 4 4 Definition and preparation of specimen 4.1 Protected bundle (bundle P) Bundles P are made of arc tracking resistant cables, typically from EN 2267-010 product standard unless otherwise specified in th

19、e concerned protection sleeves product standard, with bundle external protection to be tested. The cable bundle outer diameter shall be as closed as possible to the internal diameter of the protection to be tested. This diameter is obtained: with a full assembly of size 24 cables, or with a central

20、part in various cable types covered with a full and uniform layer of size 24 cables. The sleeve shall be fitted in accordance with the manufacturers declared fitting instructions. 4.2 Aggressive bundle (bundle A) 4.2.1 Definition and constitution Bundles A are made of 7 arc-tracking resistant cables

21、, typically from EN 2267-010 product standard unless otherwise specified in the concerned protection sleeves product standard, without bundle external protection. The short circuit will be created on these bundles (see 4.3). The cables gauge is chosen in Table 1, in accordance with the In limit spec

22、ified for the protection sleeves. Table 1 Choice of cable gauge CB ratings (A) 3 5 7,5 10 10 15 20 25 50 Gauge 26 24 22 20 18 16 14 12 10 Circuit breaker used to protect these cables must be also in accordance with Table 1. EXAMPLE If the sleeve must provide a 15 A protection, take gauge 16 cables t

23、o built the bundle with 15 A CB ratings. For information the diameter of the bundle will be three times the cable diameter. prEN 6059-502:2013 (E) 5 4.2.2 Preparation Cut seven separate lengths of approximately 0,5 m consecutively from one length of cable, and strip one of the ends of insulation to

24、permit electrical connection. Clean each length of cable with a clean cloth moistened with propan-2-ol (isopropyl alcohol) fluid. 4.2.3 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 geometrica

25、lly parallel, and restrained by ties such that they are in continuous contact at least within the test zone. c) Position the ties at 50 mm spacing toward the end of the specimen as shown in Figure 2. NOTE The tie material shall be PTFE glass lacing tape conforming to A-A-52083, finish D size 3. A1-A

26、2 : phase A B1-B2 : phase B C1-C2 : phase C N : Neutral cable connected to earth Key 1 Drop needle Figure 1 Bundle A Electrical configuration prEN 6059-502:2013 (E) 6 Key 1 Glass lacing ties 2 Drop needle 3 Drops 4 10 mm to 20 mm 5 Ends of the 7 cables in the same plane Figure 2 Configuration of bun

27、dle A prEN 6059-502:2013 (E) 7 4.3 Test configuration The bundle A shall be attached on bundle P by qualified tyraps, according to the following Figures 3 and 4. For protective materials with a join or overlap the bundle A shall be so positioned that the energy from any arc is applied to the minimum

28、 material thickness part of the protective material Key 1 Ends of the 7 cables in the same plane 2 10 mm to 20 mm 3 Cable ties 4 Tyraps 5 Two attachment points 6 Length and end of bundle sample to be define with mechanical test setup 7 Drops 8 Bundle P 9 Bundle A Figure 3 Test bundles configuration

29、prEN 6059-502:2013 (E) 8 Key 1 Bundle P 2 Drip needle 3 Bundle A Figure 4 Test configuration 5 Apparatus 5.1 Electrical equipment 5.1.1 For 115 Vac 400 Hz network Connect the seven cables of the test sample within a circuit as shown in Figure 5. This circuit shall have the following requirements: a)

30、 The provision of adjustable levels of prospective fault currents for the six A, B and C cables. b) A three phase 200/115 V 400 Hz star (Y) connected supply shall be derived from a dedicated rotary machine capable of sustaining the maximum prospective fault current given in Table 1 for at least suff

31、icient time for circuit protection to operate. In any case the generator shall have a 1 min rating of not less than 20 kVA. c) Circuit breakers shall be rated as given in Table 2 and shall be single pole units. They shall have trip characteristics in accordance with EN 2350 or as required in the pro

32、duct specification. NOTE In particular case, others ratings of thermal breaker protection could be employed in accordance with aircraft manufacturer rules. d) The electrical power source shall be appropriately protected and it shall be established that no combination of test circuit events would act

33、ivate this protection. prEN 6059-502:2013 (E) 9 e) The ballast Rb resistors shall be non-inductive and of appropriate power rating. Care shall be taken to position all laboratory wiring such that inductive effects are reduced to a practical minimum. Supply cables shall be as short as possible. The b

34、allast resistor Rb is in order to prevent over voltage (115 - 115 W per phase) during the arc extinction phases (opening of an inductive circuit). f) A rheostat, Rf, limiting maximum short-circuit current per phase by simulating a line length. g) Appropriate instrumentation, recording and switching

35、control shall be installed in accordance with good laboratory practice. Key 1 Supply protection 2 Test bundle Figure 5 Test schematic circuit 5.1.2 For 230 Vac 400 Hz network a) Apply 5.1.1 with the following modifications: in b) replace “200/115 V 400 Hz” by “400/230 V 400 Hz”, in e) replace “115 -

36、 115 W per phase” by “230 - 230 W per phase”. prEN 6059-502:2013 (E) 10 b) Except if CBs are defined for 230 Vac uses, before starting tests, there must be CB preliminary verifications: verify each CB voltage drop under his nominal intensity. made a short-circuit directly on the terminals of each CB

37、 with a shunt without resistance. verify again the voltage drop. repeat five times this cycle. there must be no significant variations in the voltage drop values. if variations or bad tendency occur, CB must be changed after each tripping. 5.2 Test equipment Construct an apparatus as shown diagramma

38、tically in Figures 2, 3 and 4 which includes the following minimum provisions: a) Electrical terminations to provide a ready means of connecting test specimens into the circuit as shown in Figure 5. b) A transparent enclosure to protect personnel from ejected molten metal and short wavelength ultra

39、violet light. c) An electrolyte delivery system which provides a constant rate of (100 10) mg/min and dispenses drops from an 18 gauge needle, cut of square at the outlet. NOTE The needle wall thickness shall be selected such that the specified flow rate shall be delivered at approximately six drops

40、 per minute. 5.3 Test protocol 5.3.1 The procedure embraces at least one size of protection sleeve per sleeve thickness or construction type and for each two values of prospective fault current, to be set by adjustment of resistances Rf have been defined in Table 2. Performance of the protection at

41、a given maximum fault current shall be determined by testing three specimens. Thus six specimens are required for each protection size. 5.3.2 Additional testing of other sizes may be deemed necessary in particular cases and values of prospective fault currents, the ratings of thermal breaker protect

42、ion which are typical of aircraft use have been included in Table 1. 5.3.3 It is emphasized that electrical arcing tests are essentially destructive and can be hazardous to personnel. Therefore tests should be undertaken with all observers shielded from direct physical and visual exposure as noted i

43、n 5.2 b). The use of video recording for all tests is required. 5.4 Test rig set-up 5.4.1 Install the rating of circuit breaker appropriate to the cable size used for the test (Table 2). 5.4.2 Heavy duty electrical shorting connections shall be fitted in substitution of a test sample to enable prosp

44、ective 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. prEN 6059-502:2013 (E) 11 5.4.3 Prepare

45、 a solution in distilled or de-ionized water of 2 % by mass of ammonium chloride and (0,1 0,01) % by mass of isooctylphenolpolyethoxyethanal, the polyethoxy chain to contain approximately 10 ethoxy units (triton -100). Exceptionally, in the circumstances given in 6.1.2, the surfactant may be changed

46、 to ammonium perfluoroalkane carboxylate, e.g. 3M FC 126 or FC 143, at a concentration of (0,1 0,01) % by mass. 5.4.4 Support the specimen in free air inclined at an angle of 10 to the horizontal with the electrical input connections at the higher end. 5.4.5 Position the delivery system so that the

47、electrolyte contacts the loom from a height of (10 2) mm above the uppermost cables in the loom at a point which allows the solution to run along the cables so that it wets the exposed conductor ends. Ensure that the drops strike the cables at the top centre of the circumference such that they fall

48、into the crevice between cables A1 and B1. 6 Method 6.1 Test Procedure 6.1.1 Install a test specimen with electrical connections as shown in Figure 1 and with Rf set, as in 5.4.2 above, to give the required fault current specified in Table 2. Table 2 Prospective fault currents Wire size 001 002 004

49、060 010 012 020 030 050 AWG a26 24 22 20 18 16 14 12 10 CB Ratings 3 5 7.5 10 10 15 20 25 50 Prospective fault currents 2 In 6 10 15 20 20 30 40 50 100 10 In 30 50 75 100 100 150 200 250 500 aClosest American Wire Gauge. 6.1.2 Apply electrical power to the specimen and start the flow of electrolyte at a rate of (100 10) mg/min. Particular care should be taken to ensure that the electrolyte flows between the damage sites as the evidenced by the steaming of the electrolyte and the devel