1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 14 March 2003 prEN 3841 -306 Edition P 3 March 2003 Comments should be sent within six months after the date of publication to Electrical Domain AECMA-STAN ICs: 49.060 Descriptors: Srie arospatiale Disjoncteurs Mthodes dessais Pa
2、rtie 306 : Dure de vie Supersedes edition P 2 September 1998 ENGLISH VERSION Aerospace series Circuit breakers Test methods Part 306: Service life Luft- und Raumfahrt Schutzschalter Prfverfahren Teil 306: Lebensdauer This “Aerospace Series“ Prestandard has been drawn up under the responsibility of A
3、ECMA-STAN (The European Association of Aerospace Industries - Standardization). It is published on green paper 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 Pr
4、estandard, 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 AECMA-STAN it will be submitted as a draft European Standard to
5、 CEN (European Committee for Standardization) for formal vote. I I Copyright 2003 O by AECMA-STA1 Page 2 prEN 3841-306: 2003 Foreword This standard was reviewed by the Domain Technical Coordinator of AECMA-STANS Electrical Domain. After inquiries and votes carried out in accordance with the rules of
6、 AECMA-STAN defined in AECMA- STANS General Process Manual, this standard has received approval for Publication. Page 3 prEN 3841-306: 2003 1 Scope This standard specifies a method of verifying the service life of circuit breakers. It shall be used together with EN 3841-100. 2 Normative references T
7、his European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publi
8、cations 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 applies. EN 3841-100, Aerospace series - Circuit breakers - Test methods - Patt 700: General 1) 3 Method 3.1 General conditions The
9、circuit breakers shall be mounted as specified in EN 3841-100, in connection with the applicable technical specification and the product standard. The adjustment of the test current shall be carried out with ohmic resistors and ironless inductors. NOTE reached. If iron-core inductors are used, satur
10、ation shall not occur until the peak of the test current has been 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. 3.2 Test circuit According to figure 1 with d.c. and a
11、.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 Page 4 prEN 3841-306: 2003 r e! G S m 2 c“ . e Y- N S m e! G 2 c“ . e Y- Page 5 prEN 3841-306: 2003 3.3 Operations 1 operating cycle is defined as 1 closing an
12、d then 1 opening of the circuit breakers. The circuit breakers may be operated either manually or by means of a mechanical device simulating the manual operation as much as possible. The test shall be carried out with 2 operating cycles per minute (electrical tests) or 6 or 7 operating cycles per mi
13、nute (mechanical tests) at an actuating speed of 12 mm/s, with a duty cycle of 20 %. 3.4 Service life without load The number of operating cycles shall be specified in the product standard. Verification tests in accordance with technical specification and product standard. 3.5 Service life at rated
14、current The number of operating cycles and the applicable load values shall be specified in the product standard. The load of the signal contacts related to the load of the main contacts shall also be indicated in the product standard. Verification tests in accordance with technical specification an
15、d product standard. 3.6 The number of operating cycles shall be specified in the product standard. Verification tests in accordance with technical specification and product standard. Service life at low current 3.7 3.7.1 General The number of operating cycles and the applicable load values shall be
16、specified in the product standard. Service life with overload tripping 3.7.2 Operations 3.7.2.1 Break operation (CO) The circuit breakers shall be switched on without current. Then the overload shall be switched an to the circuit breakers by means of the main switch (SI) and maintained until the cir
17、cuit breakers trip. 3.7.2.2 Make operation (OCO) The main switch (SI) shall be closed and the circuit breakers shall be switched on. Then the actuator button shall be released at normal operating speed. Switch off is by overload tripping. 3.7.2.3 Operating conditions When multi-pole circuit breakers
18、 are tested for single-pole overload tripping, the remaining poles shall carry 0.9 In. The number of operating cycles and the switching sequence shall be indicated in the product standard. 3.7.3 Verification tests in accordance with technical specification and product standard 3.8 Test combinations The product standard may specify test combinations according to 3.4, 3.5, 3.6 and 3.7 in a defined sequence.
