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1、BRITISH STANDARD OBSOLESCENT JULY 1983 BS G 179-2: 1966 Incorporating Amendment No. 1 Specification for Hand-operated circuit-breakers for aircraft Part 2: Three-pole circuit-breakers UDC 621.316.57:629.13.066 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:2
2、4:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-2:1966 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 Institution on
3、27 January 1966 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/43 Draft for comment D63/9671 ISBN 0 580 34536 X Amendments issued since publication Amd. No.Date of issueComments 4300July 1983Indicated by a sideline in the margin Licensed Copy: L
4、ondon South Bank University, London South Bank University, Sat Dec 09 02:24:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-2:1966 BSI 02-2000i Contents Page Forewordiii 1Scope1 2Definitions1 Section 1. General requirements 3General1 4Rating1 5Performance1 6Declarations2 7Marking2 Section 2.
5、Particular requirements 8Operation and construction2 9Dimensions3 10Environmental requirements3 11Explosion-proofness3 12Magnetic interference3 Section 3. Tests 13General3 Type tests 14Vibration test4 15Acceleration test4 16Climatic test5 17High voltage and insulation tests5 18Test of explosion-proo
6、fness5 19Measurement of compass safe distance5 20Tests of temperature rise and minimum and maximum limit of ultimate trip current5 21Operating forces test6 22Mechanical tests6 23Test of calibration of overload trip6 24Overload and re-closure test7 25Endurance tests7 26Making and breaking capacity te
7、sts7 27Test of self re-closing at low temperature8 Production tests 28Calibration tests8 29High voltage and insulation tests9 Quality tests 30Selection of samples9 31Tests of minimum and maximum limit of ultimate trip current9 32Operating force test9 33Test of calibration of overload trip9 34Vibrati
8、on test9 35Strip examination and report9 Appendix Serviceability tests12 Figure 1 Dimensions and fixing holes for general purpose push-pull three-pole circuit-breakers for aircraft (of ratings up to and including 35 amperes)10 Figure 2 Typical test circuit for breaking capacity test11 Licensed Copy:
9、 London South Bank University, London South Bank University, Sat Dec 09 02:24:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-2:1966 ii BSI 02-2000 Page Table 11 Table 22 Table 33 Table 45 Table 57 Table 68 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09
10、02:24:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-2:1966 BSI 02-2000iii Foreword This specification 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
11、requirements, and to experience 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 Recommenda
12、tions on aircraft circuit-breakers to facilitate their interchangeability internationally. Part 1 relates to hand-operated, single-pole circuit-breakers for use on 28 V d.c. and/or 115 V single-phase 400 cycle a.c. line to neutral circuits in aircraft; this Part 2 relates to hand-operated, three-pol
13、e circuit-breakers for use on 115/200 V three-phase, 400 cycle a.c. aircraft systems. Preference is expressed for the single-hole mounting circuit-breaker operated by a single push-button, and provision is made for the classification of the circuit-breakers in categories according to their making an
14、d breaking capacity; information is given of the order of time/current characteristics expected of them. 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 compass i
15、nterference. 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 requiremen
16、ts 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 flameproof types)
17、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, “Conversions factors and tables”. Obsolescent (by Amendment No. 1) The need for the equipm
18、ent covered 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. A British Standard does not purport to include all the
19、necessary provisions 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. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pa
20、ges 1 to 12 and a back cover. This standard has been updated (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 02:24:43 GMT+00:0
21、0 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-2:1966 BSI 02-20001 1 Scope This part of BS G 179 specifies the requirements for hand-operated three-pole, tr
22、ip-free circuit-breakers having an inverse time/current overload characteristic for use on 115/200 V, three-phase 400 c/s aircraft systems. 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 a
23、circuit-breaker with a single button to trip and reset the breaker by pushing to make and pulling to break 2.2 lever-operated circuit-breaker a circuit-breaker with a single lever to close and trip the breaker 2.3 trip-free circuit-breaker a circuit-breaker so designed that holding the manual operat
24、ing 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 position and the tripping mechanism has reset. Section 1. General requirements 3 General a) The
25、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 temperatures from 40 C to + 55 C and at altitudes up to 60 000 ft (18 300 m). b) The circuit-b
26、reaker 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-operated; it shall be trip free, and shall incorporate an automatic overload tripping device in e
27、ach pole. 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 to make and pulled to break the circuit, the button being perpendicular to the plan
28、e of the mounting panel. An acceptable alternative method is a single lever, moving in a plane at right angles to the mounting panel, the range of movement being equally disposed about the perpendicular. 4 Rating a) Voltage and frequency. The circuit-breaker shall operate in a nominal 115/200 V thre
29、e-phase, 400 c/s system having the characteristics specified in BS 2G 100-3. b) Current. The circuit-breaker shall be of one of the normal line current ratings listed in Table 1. Table 1 5 Performance a) Time/current characteristics. The time/current characteristics of the circuit-breaker shall be d
30、eclared by the manufacturer. They should lie within the overall limits shown in 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 26. The manufacturer shall declare the category or categ
31、ories appropriate to the circuit-breaker. AmperesAmperes 1 2 3 5 7.5 10 15 20 25 30 35 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-2:1966 2 BSI 02-2000 Table 2 6 Declarations In addition to the dec
32、larations required by BS 2G 100-1, the manufacturer shall declare: a) the category of the circuit-breaker in relation to its making and breaking capacity (see Table 6). b) the envelope of the time/current characteristics for each rating of circuit-breaker at each temperature listed in Table 2, at cu
33、rrents ranging from the minimum trip current to the breaking capacity rating. c) for circuit-breakers of 1 ampere to 10 ampere rating, 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 temperature of + 70 C w
34、ithout 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 minimum information shall be clearly and indelibly marked on each circuit-breaker: i) BS G 179-2. ii) Manufacture
35、rs 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 Operation and construction a) Push-pull circuit-b
36、reakers 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. b)
37、Lever-operated circuit-breakers shall 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 manual oper
38、ation of the lever to the “off” position. c) The circuit-breaker shall be so constructed that the three sets of contacts open and close together when manually operated at normal load and shall open together when automatically tripped on overload current in one or more lines, when manual operating de
39、vice shall move to the open or “off” position. The difference in time between the making or breaking of the three sets of contacts shall be not more than 5 milliseconds. d) The manual operating device or devices shall be insulated from all current-carrying parts, and should preferably be made of, or
40、 covered with, insulating material. The device or devices shall not remain in an intermediate position or give a false trip indication. e) The circuit-breakers shall be suitable for close mounting and shall not constitute an electrical hazard if the spacing between them is such that the side faces t
41、ouch. Circuit-breaker normal line current rating Ambient temperature Tripping current Tripping time amperes 1 to 15 20 to 35 1 to 15 20 to 35 1 to 15 20 to 35 C + 20 2 + 20 2 40 2 40 2 + 55 2 + 55 2 per cent normal current 200 400 600 1 000 200 400 600 1 000 200 400 600 1 000 200 400 600 1 000 200 4
42、00 600 1 000 200 400 600 1 000 seconds 6 to 60 1 to 7.5 0.5 to 3.5 0.2 to 1.2 40 to 70 3.5 to 5.5 1.5 to 1.8 0.35 to 0.4 14 to 200 2 to 12 1 to 5 0.25 to 1.75 500 to 800 15 to 25 4 to 5.5 1.2 to 1.9 3 to 45 0.6 to 4.5 0.25 to 1.8 0.09 to 0.53 30 to 50 2.5 to 4.5 0.9 to 1.5 0.25 to 0.35 Licensed Copy
43、: London South Bank University, London South Bank University, Sat Dec 09 02:24:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 179-2:1966 BSI 02-20003 f) The circuit-breaker shall be constructed so that the forces required to operate the manual operating device or devices do not exceed the releva
44、nt values in Table 3. The manufacturer shall declare the maximum and minimum forces required to close and trip 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 per cent for both the closing force an
45、d tripping force respectively. Table 3 g) The exposed portion of the circuit-breaker shall have a durable, non-glaring finish. h) The circuit-breaker shall be so sealed that tampering with the calibration is not possible without dismantling the device or breaking a seal. j) No. 6 UNC screws or studs
46、 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. k) The circuit-breaker shall be constructed so that it is suitable for 10 000 cycles of operation at normal rated voltage and current under t
47、he mechanical and environmental conditions specified in this standard. l) The circuit-breaker shall be mounted by means of a 15/32in UNS 28 t.p.i. threaded bush with a locating keyway in the plane of the vertical axis of the circuit-breaker. Two hexagon nuts, a shake-proof washer, and a locating pla
48、te (if required by the design of the circuit-breaker) shall be provided with each circuit-breaker. 9 Dimensions The envelope and fixing dimensions for push-button circuit-breakers should be as shown in Figure 1. 10 Environmental requirements The circuit-breaker shall comply with the relevant require
49、ments of BS 2G 100-2, in respect of mechanical and physical environmental conditions. Its grading for vibration, acceleration and climatic performance shall be: 11 Explosion-proofness The circuit-breaker shall comply with the requirements of BS 2G 100-2, for explosion-proof equipment. 12 Magnetic interference The circuit-breaker shall comply with the requirements of BS 2G 100-2, in respect of magnetic interference. Section 3. Tests 13 General a) Nature and order of tests. Tests shall be made to prove compliance with all the requirements of this Br
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