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1、BRITISH STANDARD OBSOLESCENT JULY 1983 BS G 179-1: 1962 Incorporating Amendment Nos. 1 and 2 Specification for Hand-operated circuit-breakers for aircraft Part 1: Single-pole circuit-breakers UDC 621.316.57:629.13.066 Licensed Copy: London South Bank University, London South Bank University, Sat Dec
2、 09 02:24:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-1:1962 This British Standard, having been approved by the Aircraft Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council was published under the authority of the General Council of the Institut
3、ion on 31 July 1962 BSI 04-2000 The following BSI references relate to the work on this standard: Committee reference ACE/43 Draft for comment AA(ACE) 5330 ISBN 0 580 34535 1 Amendments issued since publication Amd. No.Date of issueComments 5830May 1966 4299July 1983Indicated by a sideline in the ma
4、rgin Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-1:1962 BSI 04-2000i Contents Page Forewordiii 1Scope1 2Definitions1 Section 1. General requirements 3General1 4Rating1 5Performance1 6Declarations2
5、7Marking2 Section 2. Particular requirements 8Method of operation2 9Construction2 10Dimensions3 11Environmental requirements3 12Explosion-proofness3 13Magnetic interference3 Section 3. Tests 14General3 A. Type tests 15Vibration test4 16Acceleration test4 17Climatic test5 18High voltage and insulatio
6、n tests5 19Test of explosion-proofness5 20Measurement of compass safe distance5 21Tests of temperature rise and minimum and maximum limit of ultimate trip current5 22Operating forces test6 23Mechanical tests6 24Test of calibration of overload trip6 25Overload and re-closure test7 26Endurance tests7
7、27Making and breaking capacity tests8 28Test of self re-closing at low temperature9 B. Production tests 29Calibration tests9 30High voltage and insulation tests9 C. Quality tests 31Selection of samples10 32Tests of minimum and maximum limit of ultimate trip current10 33Operating force test10 34Test
8、of calibration of overload trip10 35Vibration test11 36Strip examination and report11 Appendix Serviceability tests12 Figure 1 Dimensions and fixing holes for 3 to 35 amp push-pull circuit-breakers10 Figure 2 Typical test circuit for breaking capacity test11 Licensed Copy: London South Bank Universi
9、ty, London South Bank University, Sat Dec 09 02:24:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-1:1962 ii BSI 04-2000 Page Table 11 Table 22 Table 33 Table 45 Table 58 Table 68 Table 79 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:39 GMT+00:00
10、 2006, Uncontrolled Copy, (c) BSI BS G 179-1:1962 BSI 04-2000iii Foreword This standard has been prepared as part of a programme of work to bring the aircraft series British Standards for hand-operated circuit-breakers up-to-date in relation to present-day and probable future requirements, and to ex
11、perience gained in working to earlier issues of the standards. Account has been taken of the requirements of relevant American specifications, and of the work of Technical Committee 20 Aircraft, of the International Organization for Standardization, to establish ISO Recommendations on aircraft circu
12、it-breakers to facilitate their interchangeability internationally. It is intended to publish the standard in a number of separate parts, each dealing with a particular type of circuit-breaker and replacing BS 2G 121 and BS G 140. Part 1 relates to hand-operated, single-pole circuit-breakers for use
13、 on 28 V d.c. and/or 115 V single-phase 400 cycle a.c. line to neutral circuits in aircraft; Part 21) relates to hand-operated, multi-pole circuit-breakers for use on 200 V three-phase, 400 cycle a.c. aircraft systems. One of the principal differences between this standard and earlier British Standa
14、rds for aircraft circuit-breakers, e.g. BS G 121, is that preference is now expressed for the type of circuit-breaker operated by a single push-button. Provision is made for the classification of the circuit-breakers in categories according to their making-and-breaking capacity. In determining these
15、 categories, whilst adopting the essential features of the American specification test method and fault current characteristic, reference has been made to the actual measured conditions which apply at various points in the electrical power system of a number of particular aircraft types, and also to
16、 the tested making-and-breaking capacity of a number of existing circuit-breakers of British and American design. The tests, which have been grouped as type tests, production tests and quality tests, now include a test of the force required to operate the circuit-breaker and a test for freedom from
17、compass interference. A test circuit is specified for the making-and-breaking capacity test, and recommendations are made as to suitable tests for verifying the serviceability of the circuit-breakers after storage or use. Reference to the following British Standards is required: BS 2G 100, General r
18、equirements for electrical equipment and indicating instruments for aircraft. BS G 177, Nyvin type electrical cables for aircraft. BS G 178, Crimped joints (non-insulated) for general purpose electrical cables for aircraft. BS 862, Air-break circuit-breakers (including totally-enclosed and flame-pro
19、of types) for voltages not exceeding 660 volts. NOTEThe figures in British units are to be regarded as the standard: metric conversions are approximate. More accurate conversions should be based on the tables in BS 350, “Conversion factors and tables”. Obsolescent The need for the equipment covered
20、by this British Standard has been reviewed and it has been decided that, in the interests of rationalization, it should be regarded as obsolescent and not therefore used for new designs. The standard will be withdrawn in due course. 1) To be prepared. Licensed Copy: London South Bank University, Lon
21、don South Bank University, Sat Dec 09 02:24:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-1:1962 iv BSI 04-2000 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance wit
22、h a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 12 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated.
23、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 02:24:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-1:1962 BSI 04-20001 1 Scope This part of BS G 179 specifies the requirements for
24、 hand-operated single-pole, trip-free circuit-breakers having an inverse time/current overload characteristic for use in nominal 28 V d.c. and/or 115 V single-phase 400 c/s a.c. line to neutral circuits. It is not envisaged that single-phase circuit-breakers will be required for 200 V a.c. line to l
25、ine circuits. Tests outside the scope of this part of the standard will be necessary if the circuit-breaker is required in such applications. 2 Definitions For the purposes of this British Standard the relevant definitions of BS 862, together with the following, apply: 2.1 push-pull circuit-breaker
26、a circuit-breaker with a single button to trip and reset the breaker by pushing to make and pulling to break 2.2 two-button circuit-breaker a circuit-breaker with separate trip and reset push buttons 2.3 lever-operated circuit-breaker a circuit-breaker with a single lever to close and trip the break
27、er 2.4 trip-free circuit-breaker a circuit-breaker so designed that holding the manual operating device in the closed position will not override the automatic or manual tripping mechanism and subsequent closure of the contacts cannot occur until the operating device has been returned to the open pos
28、ition and the tripping mechanism has reset Section 1. General requirements 3 General a) The circuit-breaker shall comply with the requirements of this British Standard, those of BS 2G 100, and those of the relevant circuit-breaker drawings. The circuit-breaker shall be suitable for use at ambient te
29、mperatures from 40 C to + 55 C and at altitudes up to 60 000 ft (18 300 m). b) The circuit-breaker shall be suitable for mounting through a panel from the rear, preferably by single- hole fixing, and shall operate satisfactorily when mounted in any attitude. c) The circuit-breaker shall be hand-oper
30、ated; it shall be trip free, and shall incorporate an automatic overcurrent tripping device. d) The circuit-breaker shall be designed so that after tripping on overload it cannot reclose automatically. e) The preferred method of operation of the circuit-breaker is by means of a single button pushed
31、to make and pulled to break the circuit, the button being perpendicular to the plane of the mounting panel. Acceptable alternative methods are: i) two push buttons, one to make and one to break the circuit, the buttons being perpendicular to the plane of the mounting panel; or ii) a single lever, mo
32、ving in a plane at right angles to the mounting panel, the range of movement being equally disposed about the perpendicular. 4 Rating a) Voltage. The circuit-breaker shall operate in a nominal 28 V d.c. and/or 115 V single-phase 400 cycle a.c. supply (line to neutral circuit in a 200 V threephase, 4
33、00 cycle a.c. system) having the characteristics specified in BS 2G 100, Part 3. b) Current. The circuit-breaker shall be of one of the normal current ratings listed in Table 1. Table 1 5 Performance a) Time/current characteristics. The time/current characteristics of the circuit-breaker shall be de
34、clared by the manufacturer. They should lie within the overall limits shown in Table 2. AmperesAmperes 3 5 7.5 10 15 20 25 30 35 50 70 100 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-1:1962 2 BSI 0
35、4-2000 Table 2 b) Making and breaking capacity. The circuit-breaker shall have a making and breaking capacity appropriate to the relevant category as specified in Clause 27. The manufacturer shall declare the category or categories appropriate to the circuit-breaker. 6 Declarations In addition to th
36、e declarations required by BS 2G 100, Part 1, the manufacturer shall declare: a) the category of the circuit-breaker in relation to its making and breaking capacity (see Table 6 and Table 7); b) the envelope of the time/current characteristics for each rating of circuit-breaker at each temperature l
37、isted in Table 2, at currents ranging from the minimum trip current to the breaking capacity rating. c) for circuit-breakers of 3 to 10 ampere capacity, the tripping times for 20 and 30 times normal current; d) the maximum current which the circuit-breaker will carry for one hour at an ambient tempe
38、rature of + 70 C without tripping; e) the maximum and minimum forces necessary to operate the circuit-breaker manually; f) the system of batching used for quality test sampling. 7 Marking a) The following information shall be clearly and indelibly marked on each circuit-breaker: i) BS G 179-1. ii) M
39、anufacturers name or identification. iii) Manufacturers type number. iv) Current and voltage ratings. b) The normal current rating of the circuit-breaker shall be clearly engraved or embossed on the manual operating device. Section 2. Particular requirements 8 Method of operation a) Push-pull circui
40、t-breakers shall be operated manually by pushing the button to close the circuit and by pulling to open. The portion of the button visible when the circuit-breaker is in the closed position shall be black. A white band on the button shall be exposed when the circuit-breaker is in the open position.
41、b) For two-button circuit-breakers the closing button shall be the larger button. It shall be black and shall have a white ring recessed in the end for identification purposes. The trip button shall be black and shall be designed or shielded to minimize the possibility of its inadvertent operation.
42、c) Lever-operated circuit-breakers shall clearly indicate the “on” position of the lever. The “on” and “off” positions of the lever shall be symmetrical about the pivot point. The minimum angle of movement of the lever between the “on” and “off” positions shall be 40. The circuit shall be opened by
43、manual operation of the lever to the “off” position. d) At the values of current specified in Clause 5 a) the circuit-breaker contacts shall open automatically and the manual operating device shall move to the open or “off” position. 9 Construction a) The manual operating device or devices shall be
44、insulated from all current-carrying parts, and should preferably be made of, or covered with, insulating material. The device or devices shall not remain in an intermediate position or give a false trip indication. Circuit-breaker normal current rating Ambient temperature Tripping current Tripping t
45、ime amperes 3 to 100 3 to 5 7.5 to 100 3 to 100 C + 20 2 40 2 40 2 + 50 2 per cent normal current 200 400 600 1 000 200 400 600 1 000 200 400 600 1 000 200 400 600 1 000 seconds 12 to 60 2 to 7.5 1 to 3.5 0.35 to 1.2 70 to 350 5 to 15 2 to 6 0.7 to 2 27 to 200 3.5 to 12 1.5 to 5 0.5 to 1.75 8 to 45
46、0.8 to 7 0.6 to 5 0.2 to 1 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-1:1962 BSI 04-20003 b) The circuit-breaker shall be constructed so that the forces required to operate the manual operating de
47、vice or devices do not exceed the relevant values in Table 3. The manufacturer shall declare both the maximum and minimum forces required to operate the circuit-breaker manually. Over the complete range of circuit-breaker ratings the maximum force shall not exceed the minimum force by more than 100
48、per cent for both the closing force and tripping force respectively. Table 3 c) The exposed portion of the circuit-breaker shall have a durable, non-glaring finish. d) The circuit-breaker shall be so sealed that tampering with the calibration is not possible without dismantling the device or breakin
49、g a seal. e) Screws or studs shall be used for the terminations on the circuit-breaker, each being capable of accepting two crimped tag-type terminations of approved design back to back. The nominal sizes of screws or studs to be used are as follows: f) The circuit-breaker shall be constructed so that it is suitable for 10 000 cycles of operation at normal rated voltage and current under the mechanical and environmental conditions specified in this standard. g) The circuit-breaker shall be mounted by means of a 15/32 in UNS 28 t.p.i. threaded bush
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