1、AECMA STANDARD NORME AECMA AECMA NORM prEN 3841 -305 Edition P 2 September 1998 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: 49.060 ENGLISH VERSION Aerospace series Circuit breakers Test
2、methods Part 305: Short-circuit performance Supersedes edition P 1 June 1996 Srie arospatiale Disjoncteurs Mthodes dessais Partie 305: Tenue en court-circuit Luft- und Raumfahrt Schutzschalter Prfverfahren Teil 305: Kurzschluverhalten This “Aerospace Series“ Prestandard has been drawn up under the r
3、esponsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of t
4、his 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 signature of the AECMA Standard Checking Centre (NPSI and formal agreement of the Official Servic
5、es of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. I Nota - Extra copies can be supplied by B.N.A.E. - Technopoiis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX Edition approved for pu
6、blication Comments should be sent within six months after the date of publication to I 1998-09-30 AECMA Gulledelle 94 B-1200 BRUXELLES C2 Chairman Mr Pezzetta aecma 1998 STD-AECMA PREN 384L-305-ENGL 1998 m LOL23LL OOLYB95 833 m Page 3 prEN 3841 -305: 1998 1 Scope This standard specifies a method of
7、verifying the short-circuit performance of circuit breakers. It shall be used together with EN 3841 -1 OO. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in th
8、e text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to a
9、pplies. EN 3841-100 Aerospace series - Circuit breakers - Test methods - Part 100: General 1) 3 Method 3.1 General conditions 3.1.1 Mounting The circuit breakers shall be mounted as described in EN 3841-100, in connection with the technical specification and the applicable product standard. 3.1.2 Pr
10、ocedure The test current shall be set while the circuit breaker is replaced by a shunt with negligible impedance. The adjustment shall be carried out with ohmic resistors and ironless inductors. (If iron-core inductors are used, saturation shall not occur until the peak of the test current has been
11、reached). The resistors and inductors shall be connected in series. The inductance of the current source shall be taken into account when determining the time constant and the power factor. During the test, voltage, current and time shall be recorded simultaneously. 3.2 Test circuit According to fig
12、ure 1 with d.c. and a.c., single-pole. According to figure 2 with a.c., three-pole. 1) Published as AECMA Prestandard at the date of publication of this standard Previous page is blank STD-AECIA PREN 384L-305-ENGL 1998 LOL23LL 00L489b 77T m Page 4 prEN 3841-305: 1998 I r- -1 - I F L i 3 w I II I I I
13、 i-? L IC LL I 3.3 Operations 3.3.1 Break operation (CO) The circuit breakers shall be switched on without current, .e. with the test circuit opened by the main switch (SI) (see figures 1 and 2). Then the short-circuit shall be initiated by the main switch. 3.3.2 Make operation (OCO) The circuit bre
14、akers shall be switched off. Main switch (SI) shall be closed so as to prepare the short- circuit. Then the short-circuit shall be initiated by switching the circuit breaker on. Afterwards the switch on the actuator shall be maintained in the “on“ position. 3.4 Operating conditions Test current, pow
15、er factor or time constant, number of operations, altitude, and switching sequence shall be defined in the product standard. There shall be an interval of 6 min to 10 min between 2 operations. After each break operation, the test voltage at the circuit breakers terminals shall be maintained for at l
16、east 1 min (main switch SI shall remain closed). When multi-pole circuit breakers are tested for single-pole overload tripping, the remaining poles shall carry 0,9 In. 3.5 Requirements The ground fuses shall not blow during the operations. Verification of technical characteristics in accordance with technical specification and product standard.
