ASD-STAN PREN 2794-001-2012 Aerospace series Circuit breakers single-pole temperature compensated rated current 20 A to 50 A Part 001 Technical specification (Edition P 2).pdf

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1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 2794-001 Edition P 2 February 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: Supersedes editio

2、n P 1 of May 1994 and will supersede EN 2794-001:1999Descriptors: ENGLISH VERSION Aerospace series Circuit breakers, single-pole, temperature compensated, rated current 20 A to 50 A Part 001: Technical specification Srie arospatiale Disjoncteurs unipolaires compenss en temprature, intensits nominale

3、s 20 A 50 A Partie 001 : Spcification technique Luft- und Raumfahrt Schutzschalter, einpolig, temperaturkompensiert, Nennstrme von 20 A bis 50 A Teil 001: Technische Lieferbedingungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defenc

4、e 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. Subsequent to the publication of this Prestandard, the technical content shall n

5、ot 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 submitted as a draft European Standard (prEN) to CEN (European Committee for Stand

6、ardization) 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 national standards conflicting with the EN. Edition approved for publicati

7、on 29 February 2012 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2012 by ASD-STAN prEN 2794-001:2012 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Terms and definitions .3 4 Description .3 5 Design .4 6 Characte

8、ristics .5 7 Tests 6 8 Qualification tests 14 9 Quality assurance 18 10 Marking .18 11 Delivery conditions 18 12 Packaging .18 13 Storage 18 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance wit

9、h the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 2794-001:2012 (E) 3 1 Scope This standard specifies the single-pole temperature compensated circuit breakers rated from 20 A to 50 A and used in aircraft on-board circuits.

10、It describes specific environmental, electrical and mechanical characteristics and the stringency of tests to be applied according to test methods of EN 3841-100. These circuit breakers are intended for use in aircraft with electrical supplies in accordance with EN 2282 (all categories). 2 Normative

11、 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) applies. EN 2083, Aerospace series Copper or c

12、opper alloy conductors for electrical cables Product standard EN 2282, Aerospace series Characteristics of aircraft electrical supplies EN 2825, Aerospace series Burning behaviour of non metallic materials under the influence of radiating heat and flames Determination of smoke density EN 2826, Aeros

13、pace series Burning behaviour of non metallic materials under the influence of radiating heat and flames Determination of gas components in the smoke EN 3841-100 (all parts), Aerospace series Circuit breakers Test Methods Part 100: GeneralEN 3844-1, Aerospace series Flammability of non metallic mate

14、rials Part 1: Small burner test, vertical Determination of the vertical flame propagation 1)EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standards TR 6083, Aerospace series Cut-outs for installation of electrical components 2)3 Terms and definitions For

15、the purposes of this document, the terms and definitions given in EN 3841-100 apply. 4 Description These circuit breakers are operated by a “push-pull“ type single push button (actuator) and with delayed action “trip-free“ tripping. Their function is assured up to the short-circuit current. 1) Publi

16、shed as ASD-STAN Prestandard at the date of publication of this standard (www.asd-stan.org). 2) Published as ASD-STAN Technical Report at the date of publication of this standard (www.asd-stan.org). prEN 2794-001:2012 (E) 4 5 Design 5.1 Materials 5.1.1 Metallic materials All metallic parts shall be

17、resistant to corrosion or finished against corrosion. When dissimilar materials are in close contact, an adequate protection against corrosion shall be used so that the electromotive force of the galvanic couple does not exceed 0,25 V. When bimetals are used, an eventual corrosion shall not affect t

18、he good operation of the circuit breaker. 5.1.2 Insulation materials The insulating parts shall be made of auto-extinguishing or non-flammable materials; they shall not emit damaging or explosive vapours, even in presence of fire or internal electric arc. They shall be insensitive to moulds and micr

19、oorganisms action. Application of any material or protective coating which might crack, break on flake shall be forbidden. Materials which are not specified or which are not specially described shall be as light as possible for the requested use. Materials shall be selected according to security cri

20、teria (toxicity, smoke density) as defined in contractual documents. 5.2 Design 5.2.1 Insulating box The insulating box shall integrate besides the mechanism, the connection and attachment unit. 5.2.2 Free release mechanism Design of circuit breaker mechanism shall allow free release; i.e. the circu

21、it breaker cuts out in case of overload, and remains cut out even if the actuator is kept by force in engaged position. A new engagement of circuit breaker is only possible after a first total release of the control actuator. The operation in these conditions shall not affect further performances of

22、 the circuit breaker. 5.2.3 Attachment All visible parts shall be black colored and non-reflective. 5.2.4 Electrical connection units They shall be able to receive the lugs. 5.2.5 Control actuator In engaged position, the visible part of the control actuator shall be of the colour stated in the prod

23、uct standard. In disengaged (or opened) position, the control actuator shall show a white strip. The outer part of this actuator shall be isolated from all undervoltage parts. prEN 2794-001:2012 (E) 5 The control actuator shall not stay in a transition position, or give a false indication about the

24、circuit breaker condition. It shall not be removable. When pushing it, power contacts of the circuit breaker engage. When pulling it, power contacts of the circuit breaker open. The circuit breaker rating is indicated in indelible white colour on the front part of the control actuator. The product s

25、tandard gives the digits positioning. 5.2.6 Rating inviolability The circuit breaker shall be designed in such a way that the calibration unit cannot be reached without breaking a sealing. 5.2.7 Leakage lines The leakage lines and the minimal space to be foreseen between the undervoltage parts and a

26、ny other part of the circuit breaker made of non-insulating material, as well as between the undervoltage parts of opposite polarity, shall be sufficient to avoid any default or arcing in all uses and climatic conditions. 5.2.8 Protection against non-release Electrical overload happening on a circui

27、t breaker locked in its engaged position (sticked contacts or non-operating release mechanism), shall cause the opening of the circuit by circuit breaker destruction without any fire or important smoke release. 6 Characteristics 6.1 General characteristics See Table 1. Table 1 General characteristic

28、s Designation Requirements Assembly See product standard. Mass See product standard. Operational altitude See product standard. 1 input terminals on power supply side (identified by digit 1) See product standard. 1 output terminals on distribution side (identified by digit 2) Operational ambient tem

29、peratures limits From 55 C to 125 C Temperature compensation From 55 C to 125 C See product standard. Rating marking On control actuator (indelible white) prEN 2794-001:2012 (E) 6 6.2 Ratings See product standard. 6.3 Nominal voltage of operational circuits See product standard. 6.4 Dimensional char

30、acteristics See product standard. 6.5 Recommended panel mounting dimensions Panel cut-out : The panel cut-out is in accordance with designation TR6083C202. Spacing : 25 mm horizontal and 40 mm vertical from the centre of the mounting holes. Panel thickness : 1 mm to 3 mm. 7 Tests 7.1 Mechanical test

31、s See Table 2. Table 2 Mechanical characteristics Tests Requirements Visual check EN 3841-201 Operational force Closing force (push) EN 3841-502 8 N to 80 N Opening force (pull) 5 N to 45 N Mechanical strength Actuator Travel EN 3841-501 For value, see product standard. Transverse load EN 3841-503 1

32、10 N Longitudinal load Push 110 N Pull 110 N Attachment nut Tightening torque EN 3841-504 5,5 N.m Rotation torque 3 N.m Main contact connection Screw tightening torque EN 3841-505 2,5 N.m Tensile force as per F1(see Figure 1 in product standard). 110 N Pressure force as per F2(see Figure 1 in produc

33、t standard). 55 N prEN 2794-001:2012 (E) 7 7.2 Environmental tests See Table 3. Table 3 Environmental conditions Tests Requirements Combined tests Ambient temperature 70 C and vibrations (see notes). Sinusoidal (see Figure 1). Duration: circuit breaker in the “closed“ position; 0,9 nload Seven cycle

34、s/axis 1 octave/min; no load Two cycles/axis 1 octave/min. circuit breaker in the “opened“ position; two cycles/axis 1 octave/min. See EN 3841-506. 5 Hz to 80 Hz Constant amplitude 2 a 0,76 mm 80 Hz to 500 Hz Constant acceleration 10 gn500 Hz to 2 000 Hz Constant acceleration 5 gnRandom (see Figure

35、2). Duration: circuit breaker in the “closed“ position; 0,9 nload 15 min/axis; no load 15 min/axis. circuit breaker in the “opened“ position; 15 min/axis. 10 Hz to 2 000 Hz Constant acceleration 5,8 gnLow frequencies (see Figure 3). Applicability: see product standard. Duration: circuit breaker in t

36、he “closed“ position; 0,9 nload Two cycles/axis; no load Two cycles/axis. circuit breaker in the “opened“ position; two cycles/axis. 10 Hz to 27 Hz to 10 Hz Constant acceleration 10 gn10 Hz to 5 Hz Constant acceleration 3,5 gnCombined tests. Ambient temperature 85 C, cabin max. altitude 4 600 m and

37、vibrations (see notes). Sinusoidal Applicability: see product standard. Duration: circuit breaker in the “closed“ position; 0,9 nload Four cycles/axis 1 octave/min; no load Two cycles/axis 1 octave/min. circuit breaker in the “opened“ position; two cycles/axis 1 octave/min. See EN 3841-511. 5 Hz to

38、54 Hz Constant shift 2 a 0,5 mm 54 Hz to 2 000 Hz Constant acceleration 3 gncontinued prEN 2794-001:2012 (E) 8 Table 3 Environmental conditions (concluded) Tests Requirements Mechanical shocks (see notes) 50 gn11 ms Half sine wave. See EN 3841-507. Constant accelerations See product standard. Sand a

39、nd dust See product standard. Corrosion (salt spray) See EN 3841-402, category S. Humidity See EN 3841-403, category A. Explosion-proofing See product standard. Contaminating liquids Cleaning and extinguishing products. See EN 3841-405. Flammability (glow wire test) See EN 3841-406. Inflammability S

40、ee test EN 3844-1, code B. Smoke density See test EN 2825, code A or code B. Toxicity See test EN 2826, code B. Overvoltage caused by lightning only on main contacts See EN 3841-308. Requirement: no tripping. NOTE 1 Vibration tests performed on circuit breakers in closed position without load and in

41、 opened position, are carried out in order to detect contact opening and closure. NOTE 2 For vibration and shock tests, the contact-opening or contact-closure shall be less than or equal to 10 s on the power and the signal contacts. NOTE 3 Shock tests are performed one on each way for each of the th

42、ree directions (i.e. six shocks in all). NOTE 4 Circuit breaker in the closed position main contacts closed. . Circuit breaker in the opened position main contacts opened. NOTE 5 Any additional vibrations testing (e.g. Sustained Engine Imbalance) shall be contractually agreed between users and manuf

43、acturers. prEN 2794-001:2012 (E) 9 Key 1 Peak to peak amplitude (mm) 2 Frequency (Hz) NOTE The identification G-PK corresponds to peak gn. Figure 1 Sinusoidal vibrations prEN 2794-001:2012 (E) 10 Key 1 Spectral density (g2/Hz) 2 Frequency (Hz) Figure 2 Random vibrations prEN 2794-001:2012 (E) 11 Key

44、 1 Frequency (Hz) 2 Acceleration level (g) 3 Time (s) NOTE The unit shall operate during application of a vibration on all three axes. The evolution of this vibration is given on the following figures with respect to time. Figure 3 Low frequencies vibrations prEN 2794-001:2012 (E) 12 7.3 Electrical

45、tests See Table 4, Table 5 and Table 6. Table 4 Electrical characteristics Tests Requirements Voltage drop of main contacts at nSee product standard and EN 3841-301 Dielectric strength (in V a.c. 50 Hz) Measurement points and voltage values: see product standard. See EN 3841-303. Leakage current 1 m

46、A No breakdown or deterioration Insulation resistance a(on main and signal contacts) See EN 3841-302. 100 M Trip threshold check See product standard and EN 3841-304. Overload trips See product standard and EN 3841-304. “Trip free“ tripping at 2 n, ambient temperature (23 5) C See EN 3841-304. Trip

47、time: 4 s to 15 s Short-circuit resistance See Table 6. See product standard and EN 3841-305. No-load and load endurance The endurance test on each circuit breaker tested shall be always performed by, first, the no-load test followed then by one of the load tests at ngiven in the product standard.Te

48、st sampling should be sufficient to perform all possible combinations. Only the test for a low current will not be preceded by the no-load test. See product standard and EN 3841-306. Measure and note every (1 000) operations (no-load and load) the voltage drops. Check of behaviour of circuit breaker

49、s in case of non-release Test at 10 nand at short-circuit maximum current. See Table 7 and EN 3841-307. aTest points identical to those used for dielectric strength test. prEN 2794-001:2012 (E) 13 Table 5 Short-circuit performance Nominal voltage 28 V d.c. 115 V a.c. (360 Hz 800 Hz) No-load voltage (30 2) V d.c. (120 5) V a.c. Minimum r.m.s. voltage at maximum short-cir