1、 STD-AECMA PREN 2573-B9-ENGL 1772 = 1032333 0032583 721 W Approved by COMITE DE NORMALISATION Of A.E.C.M.A. 1992-1 1-02 A. E .C. M .A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM The equivalent versions in French and German languages can be supplied by B N A E . Technopolis 54 . 199, rue Jean-Jacques
2、 Rousseau 92138 ISSY LES MOUlINAUX CEDEX - FRANGE prEN 2591 Pari B9 Edition 1 November 1992 EDIT PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATERIEL AEROSPATIAL Technopolis - i75, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cdex - Tl. Il) 47.36.98.76 UDC: 621.316.541 : 681.3: 620.1
3、 Key words : Aircraft industry, aircraft equipment, connecting equipment, tests, temperature rise, electric current strength, variation curves ENGLISH VERSION Aerospace series Elements of electrical and optical connection lest methods Part B9 - Current temperature derating Srie arospatiale Organes d
4、e connexion lectrique et optique Mthodes dessais Partie 69 - Taux de rduction de lintensit en fonction de lchauffement du au courant Luft- und Raumfahrt Elektrische und optische Verbindungselemente Prfverfahren Teil 69 - Bestimmung der Strom-Temperatur- Belastungsminderung This *Aerospace series- st
5、andardhas been drawn up under the responsibility ofAECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on yellow paper in three equivalent versions (English, French, German). It will be submitted as a draft European Standard to CEN (European Committee for Standardi
6、zationJ for final vote. - STD*AECMA PREN 2593-B7-ENGL 1972 1032311 0032582 b58 prEN 2591-69 Page 3 1 Scope and field of application This standard specifies a method for establishing current-temperature derating curves 1 for elements of connection depending on the various contact arrangements. It sha
7、ll be used together with EN 2591. 2 References IEC 50(302) International electrotechnical vocabulary - Chapter 302 : Electrical measuring instruments EN 2591 Aerospace series - Elements of electrical and optical connection - Test methods - General 3 Preparation of specimens 3.1 Specimens shall be wi
8、red, contacts connected in series and mated. The cross-section and the type of wires connecting the contacts together shall be appropriate to the expected test current and temperature. The length of wire between two contacts shall be between 250 mm and 300 mm. The length of the supply cable shall be
9、 appropriate to the test Set-up. The freely hanging specimen is fitted with temperature sensors. 3.2 Unless indicated in the technical specification, the following details shall be specified : - cross section and type of wires, - points for measurement of the specimen temperature, - maximum operatin
10、g temperature (Tmax.1, - number of specimens, - housing (shell) size and contact arrangement. 4 Apparatus The class of apparatus to be used shall be at least equal to 0.5 (see IEC 50(302). A regulated power supply shall be capable of delivering the specified current to & 1 % during the whole test. 1
11、) These curves can only give mean values, considering the high number of factors involved. Previous page is blank prEN 2591-B9 Page 4 5 Method The test shall be performed with : - direct current or - alternating current r.m.s., 40 Hz to 60 Hz. The sensors used shall not affect the temperature rise i
12、n the specimen or lead to errors in measurement. During the test, the specimen shall be protected from draughts by four non-heat- reflecting screens which shall not affect the temperature rise. They shall be so installed as to allow a 250 mm to 300 mm clearance around the specimen. The ambient tempe
13、rature (T,)shall be measured in the vicinity of the test Set-up outside the screens. - After the current has been maintained for one hour at each current value the temperature of the specimen, which shall be Tma,. and the ambient temperature shall be recorded. The temperature of the specimen may be
14、recorded after less than one hour if it has stabilised. The current curve shall be plotted as follows : a) Plot along X axis the maximum operating temperature (Tmax.) (figure 1). b) Plot along Y axis the test currents 11, 12, 13, (figure 2). c) Starting from the maximum operating temperature (Tmaxq)
15、 plot the temperature rises calculated (AT1, ATZ, Al$ for each test current 11, 12, 13 (figure 3). AT = Tmaxs -Tu d) Connect the points of intersection (1, 2, 3) of the current curve which ends at Tma,. along the abscissa (figure 4). This curve is the basic curve for plotting the current derating cu
16、rve. The current derating curve is obtained by reducing the current value of the basic curve to 0,8 I (generally agreed experimental coefficient) (figure 5). In no case shall the rated current for the contact or the cable be exceeded. STD-AECMA PREN A 4 A ri 257L-B7-ENGL 1772 1012311 00125Li Li20 _ prEN 259 1 -B9 Page 5 Figure 1 Lax. OC I 1 J I Figure 2 7mo xf c Base curve I Figure 4 Lax. Oc prEN 2591-89 Page 6 - - - - -.- A t I Base curve I Temperature Figure 5 A
