1、BRITISH STANDARD AEROSPACE SERIES BS2G134: 1970 Specification for D.C. generators UDC 629.7.06:621.313.28BS2G 134:1970 This British Standard, having been approved by the AerospaceIndustry StandardsCommittee, waspublished under the authorityof the Executive Boardof the Institution on 23 October1970 B
2、SI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/42 Draft for comment 67/28210 ISBN 0 580 06044 6 Foreword This revision of BSG134:1951, has been prepared as part of a programme of work to bring the Aerospace Series of British Standards for rotatin
3、g machines up to date in relation to present-day and probable future requirements, and in relation to experience gained in working on earlier issues of these standards. Reference is made in this standard to the following British Standards: BS2G100, General requirements for electrical equipment and i
4、ndicating instruments for aircraft Part1: Identification, declaration and construction Part2: Environmental and operating conditions Section2:Radio interference Part3: Characteristics of aircraft electrical systems. BS3G100, General requirements for aircraft equipment Part2: All equipment. BS3G100-3
5、, Environmental conditions Section3.1: Vibration Section3.2: Temperature-pressure requirements 1) . BSG102, General requirements for rotating electrical machinery 1) . BSSP20, Panel type air filter elements for use with internal combustion engines and compressors on aircraft. NOTEInformation regardi
6、ng metric (SI) units is given in BS350, “Conversion factors and tables”, and PD5686, “The use of SI units”. 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 with a British S
7、tandard 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, pages1 to9 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be in
8、dicated in the amendment table on the inside front cover. 1) In course of preparation. Amendments issued since publication Amd. No. Date CommentsBS2G 134:1970 BSI 12-1999 i Contents Page Foreword Inside front cover 1 General 1.1 Scope 1 1.2 Design and construction 1 1.3 Standard voltage 1 1.4 Coolin
9、g arrangements 1 1.5 Mounting and drive 1 1.6 Electrical connection 1 1.7 Radio interference suppression 1 1.8 Rating and overload requirements 1 1.9 Efficiency 1 1.10 Excitation 1 1.11 Overspeed 1 1.12 Environmental conditions 2 1.13 Declaration of performance 2 1.14 Nameplate 2 2 Tests 2.1 General
10、 2 2.2 Test conditions 2 2.3 Type tests 2 2.3.1 Weight, centre of gravity and rotor inertia 2 2.3.2 Initial check 2 2.3.3 Cold resistance of windings 2 2.3.4 Commutation 2 2.3.5 Magnetization characteristics 3 2.3.6 Ripple voltage 3 2.3.7 Brush performance at altitude 3 2.3.8 Temperature 3 2.3.9 Tem
11、perature (shortened standard test) 3 2.3.10 Insulation resistance 4 2.3.11 Overspeed 4 2.3.12 Containment 4 2.3.13 Endurance, overload and radio interference suppression 4 2.3.14 Vibration 4 2.3.15 Acceleration 4 2.3.16 Temperature-pressure 4 2.3.17 Mould growth 4 2.3.18 Compass interference 4 2.3.1
12、9 Waterproofness 5 2.3.20 Salt corrosion 5 2.3.21 Dust and sand 5 2.3.22 Fluid contamination 5 2.4 Production routine tests 5 2.4.1 Component check 5 2.4.2 Resistance of windings 5 2.4.3 Brush bedding and adjustment 5 2.4.4 Temperature 5 2.4.5 Overspeed 5BS2G 134:1970 ii BSI 12-1999 Page 2.4.6 Loadi
13、ng 5 2.4.7 Insulation 5 2.5 Production quality tests 5 2.5.1 Selection of samples 5 2.5.2 Testing 6 Appendix A Salt corrosion test 7 Appendix B Dust and sand test 7 Appendix C Fluid contamination test 9 Figure 1 Measuring device for dust and sand test 8BS2G 134:1970 BSI 12-1999 1 1 General 1.1 Scope
14、 This British Standard applies to generators for aircraft d.c.power supply. It is intended to be read in conjunction with the relevant parts of BS2G100 or BS3G100, and BSG102. 1.2 Design and construction 1.2.1 Unless otherwise stated the design and construction of the machine shall comply with the r
15、elevant requirements of BS2G100 or BS3G100, and BSG102. 1.2.2 The design aim should be to achieve3000 (aircraft) hours operation of the machine before maintenance is necessary. 1.3 Standard voltage The terminal voltage shall be compatible with the requirements of BS2G100-3. 1.4 Cooling arrangements
16、1.4.1 The cooling arrangements shall be as agreed between the manufacturer and the purchaser. 1.4.2 Cooling connections shall comply with the requirements of BSG102. 1.5 Mounting and drive The mounting and drive of the machine shall comply with the requirements of BSG102. 1.6 Electrical connection 1
17、.6.1 The electrical connections shall comply with the requirements of BS2G100-1. 1.6.2 Terminals shall be provided for both positive and negative leads and also for the open end of the excitation winding and other connections as specified. 1.6.3 Provision may be made in the terminal box for changes
18、in the direction of rotation. When this is done a clear and permanent indication shall be provided in the terminal box, showing the correct connections to suit the two directions of rotation. 1.7 Radio interference suppression If specified in the relevant individual specification, provision shall be
19、 made for internal suppression, or alternatively the machine shall be provided with attachments suitable for screened cable connections. 1.8 Rating and overload requirements 1.8.1 The manufacturer shall declare the continuous rated output of the machine under declared conditions of speed, altitude a
20、nd cooling, as required by the design specification. 1.8.2 Following normal rated-load operation at steady temperature conditions, the generator shall be capable of: 1) maintaining125% rated-load current at rated voltage and125% of minimum speed for a period of5 minutes; 2) producing at least200% ra
21、ted current for5seconds. 1.9 Efficiency The manufacturer shall declare the power required to drive the machine at rated voltage and current over the speed range when at stabilized temperature conditions with cooling at rated air flow appropriate to sea level conditions, and when being controlled by
22、the appropriate voltage regulator. 1.10 Excitation 1.10.1 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. Supplementary excitation may be employed by agreement between the manufacturer and th
23、e purchaser. 1.10.2 To assist in limiting radio noise any windings connected in series with the armature should preferably be disposed symmetrically in the armature circuit. 1.11 Overspeed Consideration should be given to the highest speed at which the machine could be driven, in the applications fo
24、r which it is intended, if all overspeed protection devices fail. If this speed is more than120% of the maximum rated speed, the machine shall be designed either to withstand the highest speed or to fail at a lower speed of not less than120% of the maximum rated speed and to contain all its parts wi
25、thin the machine frame after failure, without detriment to its mounting. The containment requirements and the necessary proving tests shall be agreed between the manufacturer and the user.BS2G 134:1970 2 BSI 12-1999 1.12 Environmental conditions 1.12.1 The machine shall comply with the requirements
26、of the stated British Standards in respect of: 1) vibration, to BS3G100-2.3.1; 2) acceleration, to BS2G100-2; 3) temperature-pressure, to BS3G100-2.3.2; 4) radio interference suppression, to BS2G100-2; 5) compass safe distance, to BS2G100-2. 1.12.2 When it is supplied with oil, the machine shall als
27、o be subjected to a fire test to ensure that it will not propagate or maintain a fire. The test shall be as required by the design specification. 1.12.3 The design of the machine shall be such that, when required and when part of an explosion-proof installation, it will not invalidate the explosion-
28、proof qualities of the installation. 1.12.4 If required by the individual specification, the machine shall also comply with the requirements of2.3.17, 2.3.20, 2.3.21, and2.3.22 of this British Standard in respect of resistance to mould growth, salt corrosion, dust and sand, and contaminating fluids.
29、 1.13 Declaration of performance In addition to the declarations required by BS2G100-1, the following information shall be provided by the manufacturer in regard to the machine: 1) continuous rated output under declared conditions of speed, altitude and cooling; 2) power required to drive the machin
30、e under the conditions specified in1.8; 3) polar moment of inertia. 1.14 Nameplate 1.14.1 A nameplate, and a modification plate which shall bear the serial number, shall be mounted on the body of the machine. 1.14.2 The following information shall be marked on the nameplate: 1) the number of this Br
31、itish Standard; 2) the manufacturers name or identification; 3) serial number; 4) type (or part) number; 5) voltage; 6) speed range; 7) rated current; 8) direction of rotation; 9) stores reference or codification number, when applicable. 1.14.3 The modification plate shall provide for ten modificati
32、on references. 2 Tests 2.1 General Tests shall be made to prove compliance with all requirements of this British Standard. The tests required are as follows, and the results obtained shall be recorded. 1) Type tests. The type tests detailed in2.3 shall be made on each type of machine. More than one
33、machine may be used for the type tests, provided that the tests prescribed in2.3.2, 2.3.3, 2.3.4, 2.3.5, 2.3.8.1, 2.3.8.2, 2.3.9,2.3.10 and2.3.11 shall be performed on one machine. Every machine used for type test purposes shall previously have passed tests equivalent to the production routine tests
34、. 2) Production routine tests. The production routine tests detailed in2.4 shall be made on every machine manufactured in conformity to this British Standard. 3) Production quality tests. The production quality tests detailed in2.5 shall be made on batch sample or samples. 2.2 Test conditions Unless
35、 otherwise specified the tests shall be made at a temperature of20 5 C, any departure from this temperature being recorded. The manufacturer shall declare the method of measurement of temperature rise. 2.3 Type tests 2.3.1 Weight, centre of gravity and rotor inertia. The weight of the machine, the d
36、istance of the centre of gravity of the machine from the mounting flange, and the polar moment of inertia of the rotor shall be determined. 2.3.2 Initial check. Brushes when fitted shall be bedded over the full arc for at least80% of their axial width and the brush spring pressures shall be measured
37、. 2.3.3 Cold resistance of windings. The cold resistance of all windings shall be measured at room temperature and corrected to20 C. 2.3.4 Commutation. As applicable, the commutation of the machine shall be assessed by the method recommended in BSG102.BS2G 134:1970 BSI 12-1999 3 2.3.5 Magnetization
38、characteristics 2.3.5.1 Open circuit magnetization characteristics. A curve showing open circuit voltage against varying field current shall be plotted, the speed being maintained constant at minimum rated speed. 2.3.5.2 Load excitation characteristics. A family of curves showing the variation of ex
39、citation current and driving torque with speed throughout the speed range at rated voltage shall be plotted for values of load current from no-load to1.25 rated-load. 2.3.6 Ripple voltage. The ripple voltage shall not exceed4.5V peak to peak at the generator terminals when the generator is supplying
40、 rated-load current to a non-inductive resistance load. NOTEFeeder cables can significantly affect the value of ripple current. 2.3.7 Brush performance at altitude 2.3.7.1 These tests are applicable only to machines with brushes and with commutators and are primarily intended to check brush performa
41、nce. The temperature, pressure and maximum humidity in the altitude chamber shall be those obtaining at the maximum rated altitude for the machine, under International Standard Atmosphere (ISA) conditions. Tests shall be performed at90% maximum speed with the coolant flow appropriate to the altitude
42、 condition. 2.3.7.2 The machine shall be run at rated-load for100h in ten cycles of10h nominal duration, each cycle being preceded by a2h ground level run. If agreed by the Approving Authority, the results of appropriate development tests may be submitted in lieu of, or as part of, evidence that the
43、 machine satisfactorily fulfills this test. 2.3.7.3 The machine shall be run on no-load at rated voltage for 10 hours at ground level followed by10hours at the maximum altitude rating of the machine. If glazing occurs under these conditions, the minimum load to prevent glazing shall be determined an
44、d declared. 2.3.7.4 For air-cooled machines records shall be made of the following measurements. Equivalent measurements shall be made for machines with other forms of cooling. 1) terminal voltage; 2) load current; 3) air pressure drop across machine; 4) outlet air pressure; 5) inlet air temperature
45、; 6) mass flow of air; 7) inlet dew point; 8) temperature of the hottest brush taken at intervals of not more than one hour, measured by a thermocouple embedded in the brush; 9) initial length of each brush; 10) length of each brush at end of each run. 2.3.8 Temperature 2.3.8.1 Temperature tests sha
46、ll be made at rated minimum and maximum speeds at ground level conditions. During these runs the load current shall be maintained at rated full load value and the voltage shall be maintained at the rated value by field control. The machine shall be complete with any covers normally fitted and the ra
47、ted quantity of coolant shall be passed through the machine. The runs shall be continued for a period of one hour after steady temperature conditions have been reached. 2.3.8.2 Whilst maintaining the same conditions, an additional test shall be made to confirm compliance with1.8.2 1). The machine sh
48、all be run at125% rated minimum speed with load current maintained at rated full load value for a period of one hour after steady temperature conditions have been reached. The load shall be increased to125% rated full load value for5 minutes, during which rated voltage shall be maintained. 2.3.8.3 A
49、 series of tests shall be performed to confirm the declared ratings in1.8.1, as required by the design specification. 2.3.8.4 During the tests records shall be made of the following: 1) output voltage and current; 2) excitation current and voltage; 3) speed; 4) quality of commutation; 5) mass flow rate, inlet and outlet temperatures and inlet and outlet pressures of coolant; 6) all other relevant temperatures, including the ambient temperature; winding temperatures shall be measured by change of resistance method when practicable. 2.3.9 Temperature (shortened s
