1、BRITISH STANDARD AEROSPACE SERIES BS 2G 196:1971 Specification for Static invertors UDC 629.7.064,5:621.314.58BS2G196:1971 This British Standard, having been approved by the AerospaceIndustry Standards Committee, was published underthe authority of the Executive Board of the Institutionon 19 Februar
2、y 1971 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/45 Draft for comment 70/198 ISBN 0 580 06218 X Amendments issued since publication Amd. No. Date CommentsBS2G196:1971 BSI 12-1999 i Contents Page Foreword iii 1 General 1 1.1 Scope 1 1.2 Defi
3、nitions 1 1.3 General construction 1 1.4 Preferred ratings 1 1.5 Supply characteristics 1 1.6 Output voltage and frequency 1 1.7 Efficiency 1 1.8 Regulation response and stability 1 1.9 Voltage balance 2 1.10 Waveform of output voltage 2 1.11 Modulation of output voltage 2 1.12 Control of voltage an
4、d frequency 2 1.12.1 Voltage 2 1.12.2 Frequency 2 1.13 Adjustment of voltage 2 1.14 Phase sequence 2 1.15 Protection 2 1.15.1 Voltage and frequency 2 1.15.2 Overload conditions 2 1.15.3 Short-circuit capacity 2 1.15.4 Automatic shut down 2 1.15.5 Reversed input polarity 2 1.15.6 Input voltage 2 1.16
5、 Vibration, acceleration and climatic proofness 2 2 Particular requirements s 2.1 Arrangement and construction 3 2.2 Terminal identification 3 2.3 Components 3 2.4 Radio interference 3 2.5 Compass interference 3 2.6 Starting 3 2.7 Cooling 3 2.8 Declarations 3 2.9 Marking 4 2.10 Warning notices 4 3 T
6、ests 4 3.1 General 4 3.2 Test conditions 4 3.3 Type tests 4 3.3.1 Starting 4 3.3.1.1 Normal 4 3.3.1.2 Reversed input polarity 4 3.3.2 Voltage and frequency regulation 4 3.3.3 Transient response 5 3.3.4 Wave form 5 3.3.5 Protection 5 3.3.5.1 Transient voltage and input voltage 5BS2G196:1971 ii BSI 12
7、-1999 Page 3.3.5.2 Output overvoltage 5 3.3.5.3 Output frequency 5 3.3.6 Voltage modulation 5 3.3.7 Efficiency 5 3.3.8 Input current 5 3.3.8.1 Maximum current demand 5 3.3.8.2 Ripple current 5 3.3.9 Overload voltage 5 3.3.10 Short-circuit capacity 6 3.3.11 Insulation resistance 6 3.3.12 Environmenta
8、l tests 6 3.3.13 Cooling test 6 3.3.14 Temperature and pressure 6 3.3.15 Fungus growth 6 3.3.16 Leakage (hermetically sealed equipment) 6 3.3.17 Waterproofness 6 3.3.18 Vibration 6 3.3.19 Acceleration 6 3.3.20 Explosion proofness 6 3.3.21 Radio interference 6 3.3.22 Compass safe distance 6 3.3.23 Sa
9、lt corrosion 6 3.3.24 Dust and sand 7 3.3.25 Contamination 7 3.4 Production acceptance tests 7 3.4.1 Voltage (and frequency) regulation 7 3.4.2 Reversed input polarity 7 3.4.3 Transient response 7 3.4.4 Waveform 7 3.4.5 Transient voltage and input voltage protection 7 3.4.6 Output frequency protecti
10、on 7 3.4.7 Maximum current demand 7 3.4.8 Insulation resistance 7 3.4.9 Phase sequence (three phase invertors only) 7 3.4.10 Voltage balance (three phase invertors only) 7 3.4.11 Endurance 7 3.5 Production quality tests 7 3.5.1 Sampling 7 3.5.2 Production quality tests 7 3.5.2.1 Short-circuit capaci
11、ty 7 3.5.2.2 Waveform analysis 7 3.5.2.3 Temperature and pressure 8 3.5.2.4 Vibration 8 3.5.2.5 Further tests 8 Appendix A Salt corrosion test 11 Appendix B Dust and sand test 11 Figure 1 Measuring device for dust and sand test 12 Table 1 Voltage balance loads 8 Table 2 Load configurations 9 Table 3
12、 Non-sinusoidal loads 10BS2G196:1971 BSI 12-1999 iii Foreword This revision of BS G 196:1966, has been prepared in the light of current knowledge of the manufacture and use of static invertors for aircraft. Account has been taken of discussion on the preparation of an ISO Recommendation for such inv
13、ertors. The standard is intended to be used in conjunction with the relevant specifications for particular designs of invertor. This British Standard requires reference to the British Standards given below: Various parts and sections of BS 2G 100 or BS 3G 100, “General requirements for equipment in
14、aircraft”, as follows: BS 3G 100-0, Introduction 1) . BS 3G 100-1, Identification, declaration and construction 1) . BS 2G 100-2, Environmental and operating conditions Section 2. Radio interference. BS 2G 100-3, Characteristics of aircraft electrical systems. BS 3G100-2.3.3.1, Vibration. BS 3G100-2
15、.3.3.2, Temperature and pressure requirements. SP 20, Panel type air filter elements for use with internal combustion engines and compressors on aircraft. BS 89, Electrical indicating instruments. BS 205, Glossary of terms used in electrical engineering. BS 410, Test sieves. NOTEThe figures in metri
16、c (SI) units are to be regarded as the standard. The conversions to imperial units are approximate. Accurate conversions should be based on the tables in BS350, “Conversion factors and tables”. Information concerning SI units is given in PD5686, “The use of SI units”. A British Standard does not pur
17、port to include all the 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
18、cover, pages i to iv, pages1to 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. 1) In course of preparation.iv blankBS2G196:1971 BSI 12-1999 1 1 General 1.1 Scop
19、e This British Standard states the general design and test requirements for400Hz static invertors for aircraft. 1.2 Definitions For the purposes of this British Standard the definitions in BS205 2)and the following apply. static invertor a unit in which semiconductor devices are used for deriving al
20、ternating current at a constant voltage and frequency from a direct current supply 1.3 General construction 1.3.1 The design and construction of the invertor shall comply with the relevant requirements of BS3G100-1 3) , and of the relevant invertor specification 1.3.2 Unless otherwise required by th
21、e relevant invertor specification, the design and construction of the invertor shall be such that it is suitable for operation at altitudes up to 18300m (60000ft). (Seealso2.7.) 1.4 Preferred ratings The preferred ratings for the invertors at sea level and at a temperature of + 70 C are as follows.
22、If required by the relevant invertor specification the ratings at temperatures of + 55 C and + 85 C shall be declared. 1.5 Supply characteristics 1.5.1 Unless otherwise required by the relevant invertor specification, the invertor shall be capable of operating over the normal input terminal voltage
23、range specified for Category B equipment in BS2G100-3 4) . 1.5.2 The invertor shall be capable of withstanding and operating under the conditions of transient and overvoltage input indicated by the appropriate curves in BS 2G 100-3 4) . 1.5.3 The invertor shall be capable of operating with a supply
24、at its terminations having a maximum impedance made up of 50mA resistive, and 104H inductive components. The ripple voltage superimposed on a smooth d.c. of this source impedance supply by normal operation of the invertor shall not exceed two volts peak to peak. The manufacturer shall declare if the
25、 invertor can operate only on a supply capable of accepting reverse current. 1.6 Output voltage and frequency 1.6.1 Single phase invertors shall have a nominal output voltage of115Vr.m.s. 1.6.2 Three phase invertors shall have nominal output voltages of200V r.m.s. line to line. 1.6.3 Unless otherwis
26、e specified the specification requirements for three phase systems are related to line neutral voltages. 1.6.4 The nominal output frequency shall be400Hz for all invertors. 1.7 Efficiency The manufacturer shall declare the maximum value of mean and r.m.s. input current of the invertor at full load,
27、and with the most unfavourable input voltage. 1.7.1 The efficiency of the invertor on full load, unity power factor (under the combination of ambient temperature and input voltage specified in the relevant invertor specification) shall be not less than 65%. 1.8 Regulation response and stability When
28、 the load is switched from 10% to 85% and from 85% to 10% full load there shall be after the first main deviation of voltage not more than one overshoot before the voltage remains within the modulation tolerance of the final steady state value, except that where the invertor response can be shown to
29、 be less than20ms, two overshoots may be permissible. 2) BS 205, “Glossary of terms used in electrical engineering”. 3) In course of preparation. Rating in V A Single phase 100 150 250 500 750 1000 Three phase 100 250 500 750 1000 1500 3000 4) BS 2G 100, “General requirements for equipment in aircra
30、ft”, Part 3, “Characteristics of aircraft electrical systems”.BS2G196:1971 2 BSI 12-1999 1.8.1 During normal operation (including load switching from10% to 85% and from 85% to10% of system capacity of the invertor full load rating), voltage surges, when converted to their equivalent step functions,
31、shall lie between limits 5 and 6 on Figure 4d in BS 2G 100-3 5) . 1.9 Voltage balance For a three phase invertor, loaded as indicated inTable 1, Item 2a, the maximum difference between individual line to line voltages and between line to neutral voltages shall not exceed2% of their nominal values. 1
32、.10 Waveform of output voltage With the invertor energized as specified in1.5 and supplying the loads indicated inTable 3, each steady state output voltage waveform at constant frequency shall be in accordance with the requirements of BS 2G 100-3 5) , unless otherwise required by the relevant invert
33、or specification. 1.11 Modulation of output voltage With the invertor energized as specified in1.5, the modulation of the output voltage shall be in accordance with the requirements of BS 2G 100-3 4) . NOTESince pulse loads are likely to result in excessive modulation the relevant invertor specifica
34、tion should state the nature of pulse loads which can be accepted. 1.12 Control of voltage and frequency 1.12.1 Voltage. Under any combination of input voltage specified in1.5 and loads specified in Table 1, Item 1 or Item 2a, the individual line to neutral voltages shall be within the normal limits
35、 specified by BS2G100-3 5) , for the point of regulation in a constant frequency a.c. system. For three phase invertors the manufacturer shall declare the departure from this tolerance if it exceeds3%, when the load is unbalanced to the extent indicated inTable 1, Item 2b. The displacement between t
36、he line to neutral voltages shall be 120 4 . 1.12.2 Frequency. Within the defined range of input voltages the frequency shall be within the limits specified in BS 2G 100-3 5) , for constant frequency a.c. systems. 1.13 Adjustment of voltage Internal means shall be provided for adjusting the output v
37、oltage over a range of 2%. 1.14 Phase sequence The invertor shall be designed so that normal phase sequence is ABC and operation in reverse is not possible. 1.15 Protection 1.15.1 Voltage and frequency. If required by the relevant invertor specification, means shall be provided for automatic shut do
38、wn of the invertor if the steady-state output voltage or the frequency exceeds the relevant limits specified in BS2G100-3 5) . 1.15.2 Overload conditions. Unless otherwise required by the relevant invertor specification, the invertor shall be able, without damage, to deliver150% rated current for 10
39、0s. The power factor and minimum input and output voltage shall be specified in the individual specification. 1.15.3 Short-circuit capacity. Unless otherwise required by the relevant invertor specification, the invertor shall be able, without damage, to deliver not less than 300% rated current in ea
40、ch case for a line to neutral and/or each line to line short-circuit for5s throughout the specified input voltage range. 1.15.4 Automatic shut down. Unless otherwise required by the relevant invertor specification, means shall be provided for automatic shut down on overload conditions exceeding the
41、limits stated in1.15.2 and1.15.3. 1.15.5 Reversed input polarity. Suitable means shall be provided for protecting the invertor from the effect of an inadvertent reversal of polarity. 1.15.6 Input voltage. The invertor shall not suffer damage as a result of connection to an input supply having a volt
42、age below the specified minimum. 1.16 Vibration, acceleration and climatic proofness The manufacturer shall declare the classification and grading of the invertor in respect of: 1) vibration, in accordance with BS 3G 100-2.3.1 6) ; 2) acceleration, in accordance with BS2G100-2 7) ; 3) climatic condi
43、tions in accordance with the relevant subsections of BS3G100-2.3 8) . 5) BS 2G 100, “General requirements for equipment in aircraft”, Part 3, Characteristics of aircraft electrical systems”. 6) BS 3G 100, “General requirements for equipment in aircraft”, Part 2, Section 3, Subsection 3.1, “Vibration
44、”. 7) BS 2G100-2, “Environmental and operating conditions”. 8) BS 3G100-2.3, “Environmental conditions”.BS2G196:1971 BSI 12-1999 3 2 Particular requirements 2.1 Arrangement and construction 2.1.1 There should preferably be no limitation in the performance of the invertor in respect of the attitude i
45、n which it may be mounted. Where any such limitation exists, this shall be declared. 2.1.2 If the invertor requires periodic overhaul it shall be designed so that the overhaul period is not less than3000h. 2.1.3 The invertor shall conform in outline and size to the requirements of the individual spe
46、cification. 2.2 Terminal identification Except when termination is by plug and socket connector the following method of terminal identification shall be adopted. The phases shall be identified by the letters A, B and C (and, when colours are used in addition to the letters, by the colours red, yello
47、w and blue respectively) in such a way that the voltages in the phases so marked attain their maximum values in the order A, B and C. Neutral points shall be brought out and identified by the letter N and, if colours are used, by the colour green. The markings L1 and L2 shall be used for single phas
48、e identification, and plus and minus signs for d.c. terminal identification. If a switching facility is installed in the invertor the control terminal shall be marked SW. 2.3 Components All components shall conform to an approved specification 9)and should preferably be selected from approved standa
49、rd ranges. 2.4 Radio interference The invertor shall be designed to minimize the generation of radio interference. Unless otherwise required by the relevant invertor specification the radiated and conducted noise voltages at all input and output terminals shall be within the Grade B limits specified in BS2G 100-2.2 10) , when measured as described therein. 2.5 Compass interference The invertor shall be designed so that the external magnetic fields produced are as small as practicable. Measurements of compass safe distance shall be made in accordance with BS 2G
