1、ASD STANDARD NORME ASD ASD NORM prEN 2283 Edition P 1 June 2009 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: Will supersede EN 2283:1996 Descript
2、ors: ENGLISH VERSION Aerospace series Testing of aircraft wiring Srie arospatiale Vrification des cblages daronefs Luft- und Raumfahrt Prfung der Verkabelung von Luftfahrzeugen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Indus
3、tries 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 not be c
4、hanged 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 Standardizat
5、ion) 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 publication 10 J
6、une 2009 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2009 by ASD-STAN prEN 2283:20092 Contents Page Foreword2 Introduction .3 1 Scope 3 2 Normative references 3 3 Terms and definitions .4 4 Tests4 5 Procedures .5 6 Requirements.7 7
7、Test report 8 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN
8、2283:20093 Introduction Due to the diversity of aircraft, manufacturing and installing methods for wiring, the tests defined in Clause 1 are carried out at different stages in the manufacturing programme: after assembly of cables into bundles before installation in the aircraft; after installation o
9、f bundles into the aircraft; after repairs or modifications. 1 Scope This standard specifies: the tests for finished wiring, including connectors and, if necessary, terminals, terminal ends, junction boxes, circuit breakers, etc.; these tests do not concern equipment installed in the aircraft (see o
10、peration of systems and do not apply to the wiring used instrumentation”; the requirements for verification of aircraft electrical wiring; continuity of circuits; voltage strength; insulation resistance. 2 Normative references The following referenced documents are indispensable for the application
11、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 2282, Aerospace series Characteristics of aircraft electrical supplies. IEC 50 (461), International Electrotechnical Vo
12、cabulary Chapter 461: Electric cables. 1)IEC 50 (581), International Electrotechnical Vocabulary Chapter 581: Electromechanical components for electronic equipment. 1)1) Published by: International Electrotechnical Commission (IEC), 3 rue de Varemb, 1211 Geneva 20, Switzerland. prEN 2283:20094 3 Ter
13、ms and definitions For the purposes of this document, the terms and definitions given in IEC 50 (461) and IEC 50 (581) apply. 4 Tests 4.1 General For all the tests, the national safety regulations shall be observed. These tests may be carried out manually or on automatic equipment. In this case, the
14、 equipment operates with programmable sequences and trip thresholds. The test shall be stopped as soon as a fault is detected, or the fault shall be memorized. The voltage shall increase or decrease in a regular manner to each of the scheduled values and the measurements shall be made after stabiliz
15、ation. Test equipment is capable of performing the voltage strength and the insulation resistance tests in a single operation, according to the requirements laid down in Table 2. 4.2 Continuity The test makes it possible to verify the conformity of cables and their connections with the design docume
16、nts. The direct current or alternating current voltage shall not exceed 28 V. The value of the current passed shall not cause damage to any part of the circuits. 4.3 Voltage strength The test makes it possible to verify that the insulation can withstand the voltage (limits) given in EN 2282. The vol
17、tage shall not be suddenly applied to the circuits ; this will avoid damaging cables. When the permitted leakage current is exceeded, the warning or protection system shall operate to avoid damage to the components being tested. It should be noted that in alternating current tests, the capacitive le
18、akage currents add (vectorially) to the fault currents detected. After each voltage strength test, the measurement point shall be grounded in order to discharge the circuit (except when this circuit remains connected to the reference point). 4.4 Insulation resistance The test makes it possible to ve
19、rify the insulation resistance of the wiring. The voltages used for these measurements are between 50 V and 500 V direct current. The fault current shall not exceed 5 mA (for a short-circuit). The measurement shall not be made until voltage and current stabilization is achieved. prEN 2283:20095 4.5
20、Test preparation The conductors and screens of screened or coaxial cables shall be tested in the same way as single core cables, provided they are accessible at both ends. The screened cable test, with respect to the ground, shall be carried out before the screens are grounded. The connector shells
21、covered with conducting protection or other conductive supports shall be grounded. Electronic components housed in junction boxes shall be short-circuited or disconnected. Connectors, switches, circuit breakers, etc. can be left in circuit provided that they can withstand the test. Otherwise the tes
22、t voltage shall be decreased. No equipment shall be connected. The parts of circuits having already been brought into contact with flammable liquids or hydraulic fluids shall only be tested when the national safety regulations are observed, so as to avoid any risk of explosion or fire. 5 Procedures
23、5.1 General The types of wiring, the systems to which they belong and their functions require several categories (see Table 1). Table 1 Categories Description A All wiring apart from specific cases dealt with under B or C B Specific circuits for each type of aircraft to be defined by mutual agreemen
24、t between manufacturers and authorities C Screened wiring, in principle isolated from the ground for tests, before being connected to the ground Aircraft wiring presenting installation difficulties and wiring that are not complete and require to be finished in the aircraft shall be subject to test a
25、nd inspection after installation (Table 2, Part II). prEN 2283:20096 Table 2 Categories (see Table 1) Tests Characteristics A B C 1 000 V a.c.aor 1 300 V d.c. 380 V a.c. aor 500 V d.c. 40 V a.c. aor 50 Vd.c. Voltage strength Minimum application time 1 s 0,1 s 0,1 s Measuring voltage ( 10 %) 500 V d.
26、c. 500 V d.c. 50 V d.c. Part I : Tests after manufacture(prior to installation in aircraft)Minimum insulation resistance RH b = 70 % 20 M 50 M 10 M 1 000 V a.c. aor 1 300 V d.c. 380 V a.c. aor 500 V d.c 40 V a.c aor 50 V d.c. Voltage strength Application time 0,1 s to 1 min 0,1 s to 1 min 0,1 s to 1
27、 min Measuring voltage ( 10 %) 500 V d.c. 500 V d.c. 50 V d.c. RH b= 70 % 10 M 20 M 2 M Part II: Tests of assembled bundles (after installation in aircraft) Minimum insulation resistance RH b 70 % to 80 % 5 M 10 M 1 M aRoot mean square, frequency 50 Hz to 60 Hz. bRelative humidity. All the tests for
28、 wiring shall take place before the connection of equipment. Electrical and electronic components connected within the wiring shall not be exposed to voltages and currents, which could damage them (see 4.5). Voltage strength and insulation resistance tests shall be carried out between each conductor
29、 and any other conductor, and between each conductor and earth (structure). See Table 2 for conditions and requirements. Tests on pre-assembled wiring shall comply with the requirements in 5.2 and the requirements of Table 2, Part I. Tests on finished wiring (assembled and installed) shall comply wi
30、th the requirements of 5.3 and the requirements of Table 2, Part II. prEN 2283:2009 7 5.2 Testing of wiring in production 5.2.1 Continuity The test shall be carried out successively on each section of the circuit, suitably established by the control units (switches, isolators, etc.). The purpose of
31、the test is not to measure possible voltage drop on line, since this is covered by the functional tests (see EN 2282). 5.2.2 Voltage strength See Table 2, Part I. The aircraft test specification shall state the value to be applied or the specific circuits to be subjected to the relevant requirements
32、. The choice of direct current or alternating current can depend on the test devices or national requirements. The use of direct current is recommended and is necessary where the circuit capacity causes leakage currents affecting measurements. 5.3 Testing of assembled and installed bundles Perform t
33、he tests of 5.2. The applicability of these tests, either on the complete aircraft or sub-assemblies, and the specific circuits is defined in the aircraft test specification. The tests are usually carried out by automatic test equipment which, combines the voltage strength test and insulation resist
34、ance measurements. For tests, which are to be repeated, in-service inspection, repair, etc., the voltage values in Part II of Table 2 shall apply with a possible coefficient of reduction (for example 0,8). All the conductors affected by modifications or repairs on a wiring shall be tested. When scre
35、ens and certain return conductors are finally connected to the aircraft structure, they shall be considered as earth and shall no longer be disconnected. Then they will only be subject to continuity tests. 6 Requirements No deterioration due to breakdown caused by the insulation material damage or b
36、y ionisation shall appear or be detected. If, because of too high wiring capacity the alternating current voltage strength test results are not satisfactory, the direct current test is valid. The insulation resistance values shall be complied with. prEN 2283:2009 8 7 Test report It shall include the following data: Degree of relative humidity of the environment; The values obtained; The procedure; The test means; Defects; Possible deviations.
