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1、BRITISH STANDARD AEROSPACE SERIES BS G 261-1: 1996 ISO 5867-1: 1996 Specification for Aircraft Electromagnetic relays and contactors Part 1: General requirements ICS 49.060 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:40:05 GMT+00:00 2006, Uncontrolled Cop
2、y, (c) BSI BS G 261-1:1996 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1996 BSI 01-2000 The following BSI references relate to the work on this standard: Com
3、mittee reference ACE/6 Draft for comment 94/706953 DC ISBN 0 580 25676 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/6, Aerospace avionic, electrical and fibre-optic technology, upon which the following bodies wer
4、e represented: British Airways British Cable Makers Confederation British Rubber Manufacturers Association Civil Aviation Authority (Airworthiness Division) Federation of the Electronics Industry Ministry of Defence Society of British Aerospace Companies Amendments issued since publication Amd. No.D
5、ateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 261-1:1996 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordiii 1Scope1 2Normative references1 3Definitions1
6、4General requirements1 5Performance detail requirements6 6Tests12 7Qualification37 Annex A (informative) Example of an individual specification sheet41 Annex B (informative) Bibliography42 Figure 1 Inspection aid7 Figure 2 Contact bounce (typical circuit)14 Figure 3 Electromagnetic interference test
7、 circuit16 Figure 4 Typical transient voltage17 Figure 5 Range curve for vibration tests23 Figure 6 Standard random vibration test curves for equipment installed in fixed-wing aircraft with turbojet engines24 Figure 7 Standard sinusoidal vibration test curves for equipment installed in fixed-wing ai
8、rcraft with turbojet engines25 Figure 8 Standard sinusoidal vibration test curves for equipment installed in fixed-wing aircraft with reciprocating or turbopropeller engines26 Figure 9 Standard sinusoidal vibration test curves for equipment installed in helicopters27 Figure 10 Robust random vibratio
9、n test curves for equipment installed in fixed-wing aircraft with turbojet engines28 Figure 11 Test circuit, three-phase load transfer33 Figure 12 Alternative test circuit, three-phase load transfer34 Table 1 Strength of threaded terminals2 Table 2 Contact arrangements, symbols and terminal marking3
10、 Table 3 Auxiliary terminals4 Table 4 Symbols and marking for terminals4 Table 5 Dual coil markings4 Table 6 Dissimilar metals5 Table 7 Contact circuit voltage drop9 Table 8 Minimum values for high voltage tests9 Table 9 Pull force18 Table 10 Categorization of standard vibration test requirements by
11、 aircraft types and equipment locations22 Table 11 Categorization of severe vibration test requirements for fixed-wing turbojet engine aircraft and equipment locations22 Table 12 Overload values and durations30 Table 13 Rupture values and durations30 Table 14 Duty cycle31 Table 15 Contact voltage dr
12、op32 Table 1632 Table 17 Contaminant test temperatures34 Table 1835 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 261-1:1996 ii BSI 01-2000 Page Table 1935 Table 20 Production acceptance tests38 Table 21
13、 Qualification inspection39 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 261-1:1996 BSI 01-2000iii National foreword This British Standard has been prepared by Techni
14、cal Committee ACE/6 and is identical with ISO 5867-1:1996 Aircraft Electromagnetic relays and contactors Part 1: General requirements, published by the International Organization for Standardization (ISO). The Technical Committee has reviewed the provisions of ISO 1540:1984, IEC 50 (446):1990 and IE
15、C 158-2:1982 to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct a
16、pplication. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard ISO 7137:1995BS 4G 229:1996 Schedule for environmental conditions and test procedures for airborne equipment (Identical) IE
17、C 68-2-17:1994BS EN 60068 Environmental testing BS 60068-2 Test methods BS EN 60068-2-17:1995 Test Q. Sealing (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 42, an inside back cover and a back cover. This standard has been updated
18、 (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: L
19、ondon South Bank University, London South Bank University, Sat Dec 09 02:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 261-1:1996 BSI 01-20001 1 Scope This part of ISO 5867 specifies the performance requirements for electromagnetic relays and contactors for use in nominal 28 V d.c. or 115 V/
20、200 V 3-phase, 400 Hz, a.c. systems having the characteristics specified in ISO 1540. This part of ISO 5867 specifies the performance requirements for relays and contactors having nominal contact ratings of 5 A a.c., 5 A d.c. or greater. Auxiliary contacts, where applicable, may be rated at lower cu
21、rrents. Three temperature classes and three classes of sealing are specified. This part of ISO 5867 is applicable to single-pole and multi-pole relays and contactors, electromagnetically operated and magnetically held, or electromagnetically operated and mechanically or magnetically latched, control
22、led by a voltage of 28 V d.c. or 115 V, 400 Hz, a.c. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 5867. At the time of publication, the editions indicated were valid. All standards are subject to re
23、vision, and parties to agreements based on this part of ISO 5867 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1540:1984, Aerospace Charact
24、eristics of aircraft electrical systems. ISO 7137:1995, Aircraft Environmental conditions and test procedures for airborne equipment. IEC 50 (446):1990, International Electrotechnical Vocabulary Chapter 446: Electrical relays. IEC 68-2-17:1994, Basic environmental testing procedures Part 2: Tests Te
25、st Q: Sealing. IEC 158-2:1982, Low-voltage controlgear Part 2: Semiconductor contactors (solid state contactors). 3 Definitions For the purposes of this part of ISO 5867, the definitions given in IEC 50 (446) and IEC 158-2 apply. 4 General requirements 4.1 Detail specification sheets The individual
26、item requirements shall be as specified in this part of ISO 5867 and in accordance with the detail specification sheets related to this part of ISO 5867. In the event of any conflict between requirements of this part of ISO 5867 and the detail specification sheets, the latter shall govern. The manuf
27、acturer shall prepare an individual specification sheet for each type of device produced. The individual specification sheet shall define the values for parameters given in Annex A. 4.2 Temperature class The temperature classes which define the maximum and minimum temperatures for use shall be as fo
28、llows: Class A: 65 C to + 125 C Class B: 55 C to + 85 C Class C: 55 C to + 70 C 4.3 Sealing Enclosure design shall be classified as follows: Class 1: Hermetically sealed Class 2: Environmentally sealed Class 3: Ventilated enclosed 4.4 Altitudes Class 1 and 2 sealed relays and contactors shall be sui
29、table for use up to an altitude of 25 000 m. Class 3 contactors shall be suitable for use up to an altitude of 15 000 m. 4.5 Dimensions Relay and contactor dimensions shall be as defined in the detail specification sheet (see 4.1). 4.6 Design requirements The relays and contactors shall operate sati
30、sfactorily when mounted in any attitude. The size and mass shall be the minimum compatible with the required performance, reliability and strength. The relays and contactors shall be of the single-pole or multi-pole (main contacts) type, with or without auxiliary contacts. The auxiliary contacts sha
31、ll be mechanically linked to the main contacts and shall indicate the position of the main contacts. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 261-1:1996 2 BSI 01-2000 Suitable barriers shall be plac
32、ed between the terminals of the contactors in order to prevent an accidental short-circuit. These barriers shall be sufficient to prevent the short-circuiting of all the terminals through the presence of a flat conducting part. The coil of the relay or contactor shall operate from either, but not bo
33、th, a 28 V d.c. or 115 V a.c., 400 Hz system having the characteristics specified in ISO 1540. The contacts of relays or contactors shall be capable of switching 28 V d.c. and/or 115 V/200 V a.c., 400 Hz having a system characteristic specified in ISO 1540. 4.7 Sealing enclosures Sealing enclosures
34、shall be of sufficient mechanical strength to withstand the normal abuse incurred in handling, transit, storage and installation without causing malfunction or distortion of parts. The case shall not be a part of the contact or coil electrical circuits. NOTE 1The case may be a part of the magnetic c
35、ircuit. 4.7.1 Hermetically sealed enclosures Hermetically sealed enclosures shall be constructed as a gastight enclosure that has been completely sealed by fusion of glass or ceramic to metal, or bonding of metal to metal. Hermetically sealed relays and contactors shall be purged of all air. Relays
36、shall be filled with a suitable inert gas. The fill gas shall have a dew point of at least 5 C below the lowest temperature rating of the device. NOTE 2Contactors may be filled with air or with inert gas. 4.7.2 Environmentally sealed enclosures Environmentally sealed enclosures shall be constructed
37、by any means other than that defined in 4.7.1 to achieve the degree of seal specified in the detail specification (see 4.1). Environmentally sealed relays and contactors shall be purged of all air. Relays shall be filled with a suitable inert gas. The fill gas shall have a dew point of at least 5 C
38、below the lowest temperature rating of the device. NOTE 3Contactors may be filled with air or with inert gas. 4.7.3 Ventilated enclosures Ventilated contactors shall be totally enclosed for mechanical and dust protection and shall be explosion-proof. The enclosure shall be so designed that when the
39、cover is removed, the contactor shall be capable of operating without adjustment. The enclosure design shall be such that pressure differentials cannot exist between the inside and outside to aggravate the moisture accumulation problem. The cover shall be rugged in design, constructed of high impact
40、 materials, and securely mounted to the contactor. 4.8 Installation clearances Adequate clearance shall be provided for installation of terminals and mounting hardware. Clearance for standard socket wrenches shall be provided. Special installation tools shall be avoided where possible. 4.9 Grounding
41、 The mounting shall provide an effective electrical contact to ground when the relay or contactor is mounted. 4.10 Terminals Metal covers shall be provided with a means for grounding. Relays and contactors shall have electrical terminals as specified in the detail specification (see 4.1). No rotatio
42、n or other loosening of a terminal shall occur throughout the relay or contactor life. 4.10.1 Terminal type Power terminals of greater than 25 A rating shall be of the threaded stud type. Terminals rated at 25 A or less may be plug-in, solder hook, stud or screw terminals. 4.10.1.1 Threaded terminal
43、s and mounting studs Stud terminals shall accept connections using crimped type lugs made of copper or aluminium, or copper bars. A flat washer having a diameter at least equal to that of the base of the terminal, and a self-locking nut or standard nut with suitable locking washer shall be used on e
44、ach terminal. No rotation or other loosening of a terminal, or any fixed portion of a terminal, shall be caused by any mechanical forces specified in Table 1 involved in the connection or disconnection, throughout the life of the relay or contactor. These are maximum values which shall not be exceed
45、ed. NOTE 4For installation torque values, see the detail specification (4.1). Table 1 Strength of threaded terminals (static value of pull and torque) Thread size ForceTorque NlbfNminlbf No. 4-40 UNC No. 6-32 UNC No. 8-32 UNC No. 10-32 UNC No. 10-24 UNC 1/4-28 UNC 5/16-24 UNF 3/8-24 UNF 7/16-20 UNF
46、1/2-20 UNF 22,2 133 156 180 180 222 311 445 445 445 5 30 35 40 40 50 70 100 100 100 0,497 1,13 2,26 3,615 3,954 8,474 11,298 16,948 16,948 16,948 4,4 10 20 32 35 75 100 150 150 150 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:40:05 GMT+00:00 2006, Uncontro
47、lled Copy, (c) BSI BS G 261-1:1996 BSI 01-20003 Each terminal shall have a terminal seat that shall provide the normal current-conducting path. The diameter of the seat shall not be less than the area necessary to ensure that the current density does not exceed 1,55 106A/m2 (1 000 A/in2). NOTE 5The
48、seat does not include the cross-sectional area of the stud. Stud terminals shall be capable of accommodating two lugs with hardware as specified. A minimum of one and a half threads shall remain above the nut with all parts tightened in place. 4.10.1.2 Solder hook or straight terminals Solder termin
49、als shall be tin plated. The terminal design shall allow for at least two wires of relay rating to be connected (see 4.1). 4.10.1.3 Plug-in terminals Plug-in terminals shall conform to the arrangement and dimensions necessary for proper mating with the associated socket or connector. For plug-in relays, the mounting arrangement of the relay and its corresponding socket shall be designed such that the entire weight of the relay shall be suspended and the stability of its mounting s