1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 14 March 2003 prEN 3841 -508 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: ENGLISH VERSION Aerospace series Circuit breaker
2、s Test methods Part 508: Centrifugal acceleration Supersedes edition P 2 September 1998 Srie arospatiale Disjoncteurs Mthodes dessais Partie 508 : Acclration centrifuge Luft- und Raumfahrt Schutzschalter Prfverfahren Teil 508: Zentrifugalbeschleunigung This “Aerospace Series“ Prestandard has been dr
3、awn up under the responsibility of AECMA-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. Subs
4、equent to the publication of this 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 review by users and formal agreement of AECMA-STAN it will be submi
5、tted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Page 2 prEN 3841-508: 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 o
6、f AECMA-STAN defined in AECMA- STANS General Process Manual, this standard has received approval for Publication. Page 3 prEN 3841-508: 2003 1 Scope This standard specifies a method of verifying the capability of circuit breakers to withstand centrifugal acceleration. It shall be used together with
7、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 the text and the publications are listed hereafter. For dated references, subsequent amendment
8、s 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 applies. IS0 2669, EN 3841-100, Environmental tests for aircraft equipment - Steady-state acc
9、eleration Aerospace series - Circuit breakers - Test methods - Patt 700: General 1) 3 Method 3.1 Mounting The circuit breakers shall be mounted in the centrifuge on a rotating support according to 2 and 4.“ of EN 3841-100. The electrical connection shall be made with the cables of the section specif
10、ied in EN 3841-100, Table 1. The connection cables shall be attached to the support approximately 100 mm from the terminals. The circuit breakers and the cables shall be mounted with the torque indicated in the product standard. The circuit breakers shall be shielded from air flow by a screen. 3.2 P
11、rocedure The behaviour of the circuit breakers in steady-state acceleration shall be tested according to IS0 2669. The test shall be carried out for six planes of the main axis of the circuit breakers. Two tests in each direction are required per circuit breaker: - 1“test: 10 min in the open positio
12、n; - 2“d test: 10 min in the closed position, at 90 % of current rating. The acceleration value shall be specified in the technical specification. During the test, it shall be established that the contacts do not close for a period 2 10 ps (circuit breakers in the open position) or open for a period 2 10 ps (circuit breakers in the closed position). 4 Req u i remen t Requirements in accordance with technical specification and product standard. 1) Published as AECMA Prestandard at the date of publication of this standard
