1、BRITISH STANDARD AEROSPACE SERIES BSG248:1993 ISO10296: 1992 Specification for Hybrid remote power controllers General requirements UDC 621.316.57:629.7BSG248:1993 This BritishStandard, having been prepared under the directionof the Aerospace Standards Policy Committee, waspublished under the author
2、ityof the Standards Boardand comes into effect on 15July1993 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment90/78217 DC ISBN 0 580 22193 8 Committees responsible for this British Standard The preparation of this BritishStandard
3、 was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/6, upon which the following bodies were represented: British Airways British Cable Makers Confederation British Rubber Manufacturers Association Civil Aviation Authority (Airworthiness Division) Electronic
4、Components Industries Federation Ministry of Defence Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBSG248:1993 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Defin
5、itions 1 4 General characteristics 1 5 Design characteristics 3 6 Operating characteristics 5 7 Environmental conditions and test procedures 8 8 Qualification tests 9 Figure 1 Diagrammatic illustration of a type A hybrid remote powercontroller 4 Figure 2 Diagrammatic illustration of a type B hybrid
6、remote power controller 4 Figure 3 Timing sequence diagram 5 Table 1 Strength of threaded terminals (static value of pull and torque) 2 Table 2 Strength of threaded mounting studs (static value of pull and torque) 3 Table 3 Controller rating and associated wire size for testing 6 Table 4 Endurance t
7、ests for controllers 7 Table 5 Endurance tests for circuit breakers 7 Table 6 Contact voltage drop 7 Table 7 Trip characteristics 7 Table 8 Prospective short-circuit calibration currents 8 Table 9 Environmental conditions and test procedures 8 Table 10 Qualification tests 10 List of references Insid
8、e back coverBSG248:1993 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of the Aerospace Standards Policy Committee. It is identical with ISO10296:1992 Aircraft Hybrid remote power controllers General requirements published by the International Organizatio
9、n for Standardization (ISO). The Technical Committee has reviewed the provisions of ISO2618:1985, 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 pro
10、visions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference International Standard Corresponding British Standard ISO7137:1987 BS2G229:1987 Schedule for
11、environmental conditions and test procedures for airborne equipment Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpo
12、rated. This will be indicated in the amendment table on the inside front cover.BSG248:1993 BSI 01-2000 1 1 Scope This InternationalStandard specifies the general design and performance requirements of hybrid remote power controllers for aircraft. They consist ofan electromagnetic device or a combine
13、d electromagnetic/solid-state device, for load switching, and a solid-state control circuit for control of the load-switching devices. On aircraft, remote power controllers are used to close and open the electrical circuit and to protect wiring and equipment in the event of overload or short-circuit
14、 conditions. The load-switching device and solid-state control circuit may be mounted in a common enclosure or may be discrete inter-connected units. NOTE 1This International Standard recognizes the needtohave hybrid units which are, as far as practical, interface-compatible with fully solid-state p
15、ower controllers. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreem
16、ents based on this International Standard 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. ISO2678:1985, Environmental tests for aircraft equipmen
17、t Insulation resistance and high voltage tests for electrical equipment. ISO7137:1987, Aircraft Environmental conditions and test procedures for airborne equipment. 3 Definitions For the purposes of this International Standard, thefollowing definitions apply. 3.1 remote power controller device provi
18、ding a power switch which presents a low impedance to the flow of current from its supply to its load terminal when in the ON state and a high impedance in the OFF state NOTE 2The state of the power switch normally conforms to that represented by the last command signal applied to the controller. NO
19、TE 3The controller reverts to the OFF state on detection ofan electrical overload or other specified condition regardless ofthe command signal. A resetting operation is required to terminate the trip state. Trip-free action prevents the ON state being held in the presence of an overload trip conditi
20、on. NOTE 4The state of the power switch is represented by an indication signal supplied from the controller. NOTE 5A remote controller may be fully solid-state or hybrid. 3.2 hybrid remote power controller combination of an electromagnetic or combined electromagnetic/solid-state device(s), for load
21、switching, and a solid-state control circuit NOTE 6The load-switching device and solid-state control circuit may be mounted in a common enclosure or may be discrete inter-connected units. 3.3 trip-free when a controller has tripped open on overcurrent or on short-circuit, a trip-free feature prevent
22、s subsequent reclosure unless preceded by a reset sequence 4 General characteristics 4.1 Materials Materials shall be used which will enable the controllers to meet the performance requirements ofthis International Standard. Materials used shall not support combustion, giveoff noxious gases in harmf
23、ul quantities, give offgases in quantities sufficient to cause contamination of any part of the controller, or form current-carrying tracks when subjected to any of the tests specified herein. Unless otherwise specified, the selection of materials shall be such as to provide a shelf life of ideally2
24、0years without affecting the operation of the controller. Parts having a significantly shorter life, such as seals, shall be declared. 4.2 Construction Power controllers shall be of design, construction, minimum mass and physical dimensions compatible with requirements. Controllers shall be designed
25、 so as to ensure proper operation when mounted in any attitude. The construction of the controllers shall preclude mechanical damage, flaking of the finish, loosening of terminals, or deterioration of marking when subjected to the test methods of this International Standard. 4.3 Terminals 4.3.1 Main
26、 terminals There are two acceptable standards of main terminal.BSG248:1993 2 BSI 01-2000 4.3.1.1 Stud terminal (threaded) These terminals shall accept connections using crimped-type lugs made of copper or aluminium. A flat washer, having a diameter at least equal to that of the base of the terminal,
27、 and a self-locking nut or standard nut with suitable locking washer shall be used on each terminal. Suitable insulation barriers shall be placed between the terminals in order to prevent an accidental short circuit. The height and extent of these barriers shall be sufficient to prevent the short ci
28、rcuiting of any adjacent terminals through the presence over these partitions of a flat conducting part (see also4.7). No rotation or other loosening of a terminal, or any fixed portion of a terminal, shall be caused by material flow or shrinkage, or by any mechanical force (specified in Table 1) in
29、volved in connection or disconnection, throughout the life of the controller. Table 1 Strength of threaded terminals (static value of pull and torque) Each terminal shall have a terminal seat that shall provide the normal current-conduction path. The diameter of the seat shall not be less than the a
30、rea necessary to ensure that the current density does not exceed1,55A/mm 2 . The seat does not include the cross-sectional area of the stud. Stud terminals shall be capable of accommodating at least two crimped-type lugs with hardware as specified in the detailed specification. A minimum ofone and a
31、 half threads shall remain above the nut with all parts tightened in place. 4.3.1.2 Plug-in terminal Plug-in terminals, where applicable, shall conform to the dimensions and requirements necessary for proper mating with the associated sockets. The mounting arrangement of the unit and its correspondi
32、ng socket shall be designed so that the entire mass of the unit is suspended and the stability of its mounting is provided by an auxiliary mounting device other than the electrical terminals of the socket. Electrical and environmental tests shall be performed on the units with the appropriate or spe
33、cified socket or connector assembled to the unit. Plug-in terminals shall be gold plated over an underplate of nickel plate. 4.3.2 Auxiliary terminals The auxiliary circuits and control/status connections may be connected by stud, plug-in or connector terminals to the appropriate specification (see
34、also4.7). 4.4 Enclosures Enclosures shall be of sufficient mechanical strength to withstand the requirements of this International Standard without causing malfunction or distortion of parts. Enclosures shall be one of the following forms: ventilated explosion-proof, hermetically sealed, or environm
35、entally sealed (non-hermetic). 4.4.1 Ventilated explosion-proof enclosures Unsealed units shall be totally enclosed for mechanical and dust protection and shall be explosion proof. 4.4.2 Hermetically sealed enclosures Hermetically sealed enclosures shall be constructed as gas-tight enclosures which
36、have been completely sealed by fusion of glass or ceramic to metal, or by welding, brazing or soldering of metal to metal. Hermetically sealed units shall be purged and filled with a suitable inert gas of such characteristics that the leakage rate may be determined by conventional means. The fill ga
37、s shall have a dew point at least5 C lower than the lowest temperature specified for the unit. The unit shall be filled to an absolute pressure of(1030 70)hPa (15 1)lb/in 2 . The units shall be designed to ensure that the essential electrical performance is not jeopardized in the event of failure of
38、 the hermetic seal in service. 4.4.3 Environmentally sealed (non-hermetic) enclosures Environmentally sealed enclosures shall be constructed by any means other than that defined under hermetically sealed enclosures to achieve the degree of seal specified. Thread designation a Force Torque N lbf Nm l
39、bfin No.4-40UNC No.6-32UNC No.8-32UNC No.10-32UNF No.10-24UNC 1/4-28UNF 5/16-24UNF 3/8-24UNF 7/16-20UNF 1/2-20UNF 22,2 133,4 155,7 177,9 177,9 222,4 311,4 444,8 444,8 444,8 5 30 35 40 40 50 70 100 100 100 0,5 1,1 2,2 3,6 4 8,5 11,3 16,9 16,9 16,9 4,4 10 20 32 35 75 100 150 150 150 a See ISO263:1973,
40、 ISO inch screw threads General plan and selection for screws, bolts and nuts Diameter range0.06 to6in.BSG248:1993 BSI 01-2000 3 Environmentally sealed units shall be purged and filled with a suitable gas of such characteristics that the leakage rate may be determined by conventional means. The fill
41、 gas shall have a dew point at least5 C lower than the low-temperature rating ofthe unit. The unit shall be filled to an absolute pressure of(1030 70)hPa (15 1)lb/in 2 . The units shall be designed to ensure that the essential electrical performance is not jeopardized in the event of failure of the
42、environmental seal in service. 4.5 Grounding of enclosures The mounting shall provide an effective electrical contact to ground when the unit is mounted as specified. Alternatively, the enclosure shall be provided with a grounding connection such as aterminal or lug. The cover shall be rugged in des
43、ign, constructed of high-impact materials, and securely mounted to the unit. Metal covers shall be provided with a means of grounding. 4.6 Installation clearances Adequate clearance shall be provided for the installation of terminals and mounting hardware. Clearance for socket wrenches shall be prov
44、ided, where appropriate. Special installation tools shall not be required. 4.7 Terminal marking Stud terminal identification shall be durable and legibly marked. 4.8 Terminal covers and barriers The unit shall be provided with adequate covering or separation of terminal parts to provide protection a
45、gainst inadvertent shorting, grounding, or contact by personnel. Barriers may be removable or may be integral with removable covers. Terminal covers and barriers shall be designed to meet performance requirements applicable to the unit. The enclosure(s) shall be so designed that when the cover is re
46、moved, the controller shall be capable of operating without adjustment. The cover design shall be such that pressure differentials cannot exist between the inside and outside. 4.9 Mounting No rotation or other loosening of a stud, or any fixed portion of a stud, shall be caused by material flow or s
47、hrinkage, or by any mechanical forces (as specified in Table 2) involved in mounting or demounting, throughout the life of the controller. Table 2 Strength of threaded mounting studs (static value of pull and torque) 5 Design characteristics 5.1 General There are two basic types of hybrid remote pow
48、er controller. 5.1.1 Type A For this type, the power switching is carried out only by an electromagnetic device. See Figure 1. A type A control circuit has an output capable ofswitching the associated contactor coil. 5.1.2 Type B For this type, the primary function of the main contact(s) of the elec
49、tromagnetic device is to carry current. The function of making and breaking (i.e.switching) the load current is achieved by a solid-state switch. (The electromagnetic switch may be required to break the fault current.) See Figure 2. In type B, the solid-state switching element(s) may vary impedance to give “soft” switch(es) and thereby minimize switching transients. A type B control circuit has an additional output to operate the solid-state power switch. Both types A and B use solid-state devices for the control circuit of t
