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1、BRITISH STANDARD BS 2G 124-2: 1966 Specification for A.C. generators for aircraft Part 2: Variable frequency UDC 629.13.066:621.313.3-8 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 124-2:1966 This British Standard, having been appro
2、ved by the Aerospace 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 30 December 1966 BSI 04-2000 The following BSI references relate to the work on this standard: Committe
3、e reference ACE/42 Draft for comment 66/7395 ISBN 0 580 34139 9 Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 124-2:1966 BSI 04-2000i Contents Page Forewordii 1Scope1 Section 1
4、. General requirements 2General construction1 3Cooling arrangements1 4Mounting and drive1 5Terminal arrangement1 Section 2. Particular requirements 6Voltage, frequency, phases and waveform1 7Rating and overload requirements1 8Efficiency1 9Excitation1 10Overspeed1 11Vibration, acceleration, climatic
5、proofing, radio interference and compass interference2 12Declaration of performance2 13Nameplate2 Section 3. Tests 14General2 15Weight moment of inertia and centre of gravity2 16Initial check2 17Open-circuit characteristic and losses2 18Short-circuit characteristic and losses3 19Voltage balance3 20T
6、emperature tests3 21Insulation tests3 22Overspeed tests3 23Wave form3 24Determination of reactances and time constants4 25Containment test4 26Endurance and overload test4 27Radio interference test4 28Altitude test4 29Vibartion test5 30Acceleration test5 31Climatic tests5 32Compass interference test5
7、 33Resistance of windings5 34Overspeed test5 35Open-circuit characteristic5 36Phase sequence and voltage balance5 37Short-circuit characteristic5 38Heat test6 39Insulation tests6 40Sampling6 41Testing6 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:50 GMT+00:00 2006, Uncontrolled Copy,
8、 (c) BSI BS 2G 124-2:1966 ii BSI 04-2000 Foreword This standard has been prepared as part of a programme of work to bring the aircraft series British Standards for rotating machines up to date in relation to present-day and probable future requirements, and to experience gained in working to earlier
9、 issues of the standards. The standard is published in two parts, Part 1 dealing with constant frequency generators, being a revision of BS G 124:1950, and Part 2 with variable frequency machines. Reference is made in the standard to the following: BS 2G100, General requirements for electrical equip
10、ment and indicating instruments for aircraft. BS G102, General requirements for rotating electrical machines for aircraft1). BS , Methods of test for determining synchronous machine quantities1). A British Standard does not purport to include all the necessary provisions of a contract. Users of Brit
11、ish 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 and ii, pages 1 to 6 and a back cover. This standard has b
12、een updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In course of preparation. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 124-2:1966
13、 BSI 04-20001 1 Scope This part of BS G 124 specifies the general design and test procedure for generators for aircraft variable frequency a.c. power supply. It is intended to be read in conjunction with BS 2G 100 and BS G 102.2) Section 1. General requirements 2 General construction Unless otherwis
14、e stated, the design and construction of the machine shall comply with the relevant requirements of BS 2G 100 and BS G 102.2) The design aim should be to achieve 3 000 (aircraft) hours operation of the machine before requiring maintenance. 3 Cooling arrangements a) The manufacturer and purchaser sha
15、ll agree upon the cooling arrangements to be provided for the machine. b) Cooling connections shall comply with the requirements of BS G 102.2) 4 Mounting and drive The mounting and drive of the machine shall comply with the requirements of BS G 102.2) 5 Terminal arrangement The machine terminals sh
16、all comply with the requirements of BS 2G 100-1, and of BS G 102.2) Section 2. Particular requirements 6 Voltage, frequency, phases and waveform a) The full load voltage of the machine shall be 120/208 volts for a nominal 115/200 volt a.c. system and the rated line current shall relate to rated kVA
17、at the rated system volts. b) The voltage and its waveform, frequency, number and sequence of phases of the machine shall comply with the requirements of BS 2G 100-3.3) 7 Rating and overload requirements a) Unless otherwise stated, the machine shall be capable of providing rated output continuously
18、over the whole speed range. b) The manufacturer shall declare the cooling requirements in the form of rating charts in accordance with BS G 102.2) c) With the frequency maintained at 400 Hz following rated load operation at steady temperature conditions at the speed giving an output frequency of 400
19、 Hz the machine shall: i) Maintain rated voltage for two minutes at 150 per cent rated current and minimum rated power factor. ii) Withstand 200 per cent rated current for five seconds at minimum rated power factor. When agreed between the manufacturer and purchaser, the output voltage of the machin
20、e may fall to not less than 90 per cent of rated voltage. iii) Produce a symmetrical three-phase short-circuit current of at least 300 per cent rated current. 8 Efficiency The manufacturer shall declare the power required to drive the machine at rated voltage, current, power factor at maximum, and m
21、inimum speeds, and at a speed for 400 Hz. 9 Excitation The excitation system shall be independent of any external electrical supply, and shall be capable of initial build-up without reference to any other supply. Supplement excitation may be employed by agreement between the manufacturer and purchas
22、er. 10 Overspeed Consideration should be given to the highest speed at which the generator could be driven, in the applications for which it is intended, if all overspeed protection devices fail. If this speed is more than 125 per cent of the maximum rated speed, the machine shall be designed either
23、 to withstand the highest speed, or to fail at a lower speed and to contain all its parts within the machine frame after failure. The containment requirements and the necessary proving tests shall be agreed between the manufacturer and the user. 2) In course of preparation. 3) BS 2G100-3:1960 is bei
24、ng revised to include requirements for variable frequency a.c. systems. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 124-2:1966 2 BSI 04-2000 11 Vibration, acceleration, climatic proofing, radio interference and compass interference
25、 The machine shall comply with the requirements of BS 2G 100-2 in respect of: 12 Declaration of performance In addition to the declarations required by BS 2G 100, the following information shall be provided by the manufacturer in regard to the machine: a) Continuous rated output under declared condi
26、tions of altitude and cooling. b) Cooling requirements for conditions other than those declared in a). c) Power required to drive the machine under the conditions specified in Clause 8. d) Method of measurement of temperature rise. 13 Nameplate a) A nameplate and a modification plate, which shall be
27、ar the serial number, shall be mounted on the body of the machine. b) The following information shall be marked on the nameplate: i) The number of this British Standard. ii) The manufacturers name or identification. iii) Serial number. iv) Type (or part) number. v) Rated kVA. vi) Rated power factor.
28、 vii) Frequency range. viii) Speed range. ix) Rated voltage. x) Phases. xi) Direction of rotation. xii) Stores reference number, when applicable. c) The modification plate shall provide for ten modification references. Section 3. Tests 14 General a) Tests shall be made to prove compliance with all r
29、equirements of this British Standard. The tests required are as follows: the results obtained shall be recorded: Type tests. (Clauses 15 to 32) to be made on each particular design of machine. Production routine tests. (Clauses 33 to 39) to be made on every machine manufactured to this British Stand
30、ard. Production quality tests. (Clauses 40 and 41) to be made on batch sample or samples. b) More than one machine may be used for the type tests, provided that the tests prescribed in Clauses 16, 17, 18, 19 d), 20, 21, and 22 shall be performed on one machine. Every machine used for type test purpo
31、ses shall previously have passed tests equivalent to the production routine tests. c) Unless otherwise specified, the tests shall be made at a temperature of 20 5 C, any departure from this temperature being recorded. The manufacturer shall declare the method of measurement of temperature rise. Type
32、 tests 15 Weight moment of inertia and centre of gravity The weight of the machine, the moment of inertia of the rotor, and the distance of the centre of gravity from the mounting flange shall be determined. 16 Initial check The winding resistance shall be measured and corrected to a temperature of
33、+ 20 C. The brushes, if fitted, shall be bedded over the full arc for at least 80 per cent of their axial width and the brush spring pressures shall be measured. 17 Open-circuit characteristic and losses a) The open-circuit characteristic and losses shall be determined at minimum and maximum speeds
34、and at a speed for 400 Hz, up to 130 per cent rated voltage. b) The phase sequence shall be checked. a) Vibration to the performance grading declared by the manufacturer. b) Acceleration c) Climatic d) Radio interference. e) Compass safe distance. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov
35、28 14:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 124-2:1966 BSI 04-20003 18 Short-circuit characteristic and losses The short-circuit characteristic and losses shall be determined at minimum and maximum speeds, and at a speed for 400 Hz, up to 150 per cent rated current. Excitation readi
36、ngs shall also be taken at 200 per cent and 300 per cent rated current. 19 Voltage balance The machine shall be run at a speed for 400 Hz rated voltage and load, and in addition under unbalanced loading to give line currents of approximately 90, 100 and 110 per cent of the rated line current. Termin
37、al voltages shall be measured and shall comply with the requirements of BS 2G 100-3. 20 Temperature tests a) A test shall be performed under sea-level conditions at rated power factor, 400 Hz, rated load, and at an ambient temperature of 20 5 C, during which the coolant mass flow to the machine shal
38、l correspond to the value declared under Clause 7. The run shall be continued for a period of one hour after steady temperature conditions have been reached. b) For the purpose of standardizing a test for production machines a further heat test shall be performed under the same conditions as for a),
39、 except that the output terminals shall be short-circuited and the excitation adjusted to give rated output current. The coolant flow shall be the same as for a). The duration of the run shall be one hour. c) A series of tests shall be performed to enable the presentation of rating data charts over
40、the whole speed range as required by Clause 7. d) During the tests, records shall be kept of the following: i) Output: volts, amps and watts. ii) Excitation: volts and amps. iii) Mass flow rate, inlet and outlet temperatures and inlet and outlet pressures of coolant. iv) All other relevant temperatu
41、res, including the ambient temperature and the temperature rise of the output winding measured by change of resistance. 21 Insulation tests Whilst still hot from the test in Clause 20 b) the machine shall be subjected to insulation tests in accordance with BS 2G 100-2, windings for less than 100 vol
42、ts being also subjected to a voltage of 500 volts a.c. r.m.s. The conditions applied shall be recorded. 22 Overspeed tests Immediately after the test in Clause 21 and while still hot, the machine shall be run unexcited for three minutes at 125 per cent of its maximum rated speed or at such higher sp
43、eed as may be agreed with the manufacturer (see Clause 10). The machine shall be stripped and examined, and there shall be no signs of movement of the rotor parts, nor damage to the stator or rotor. The balance of the rotor shall also be checked for compliance with the requirements of BS G 102.4) 23
44、 Wave form Line voltage and phase voltage wave forms on rated load and quarter load at minimum and maximum speeds, and at a speed for 400 Hz, shall be recorded by an oscillograph or other approved means. The wave forms of the voltages shall be analysed and shall comply with the requirements of BS 2G
45、 100-3 for linear loads. 4) In course of preparation. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 124-2:1966 4 BSI 04-2000 24 Determination of reactances and time constants The following parameters shall be determined by the method
46、s described in BS.5), “Methods of test for determining synchronous machine quantities”, assuming rated frequency to be 400 Hz: NOTE 1The tests in BS. have been prepared for conventional slip-ring machines and are not necessarily applicable without modification to machines having different forms of c
47、onstruction, for example, brushless machines. NOTE 2It is important that the contactor used to make the three-phase short circuit, when determining transient and subtransient reactances and time constants, be made to close all three contacts within 10 electrical. 25 Containment test The machine shal
48、l be subjected to a test to ensure that it complies with the requirements for containment specified in Clause 10. 26 Endurance and overload test a) As applicable and practicable, parts liable to wear shall be dimensionally checked against the relevant drawings, the temperature being recorded. b) No
49、maintenance or adjustments of any kind shall be performed on the machine in the course of this test, except that, if necessary, new brushes may be fitted. The time taken to bed new brushes shall not constitute a part of the test, and a record shall be kept of wear of the brushes. c) The machine shall be run under rated cooling conditions for 1 000 hours in cycles of 10 to 20 hours duration, with sufficient shut-down time between cycles to allow the machine to cool to room temperature. For the first 100 hours of the test the machine shall be run at rated load