1、_SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising theref
2、rom, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2016 SAE InternationalAll rights reserved. No part of this publi
3、cation may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: +1 724-776-4970 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on thisTechnical Report, please visithttp:/standards.sae.org/AS6349AEROSPACESTANDARDAS6349Issued 2016-12Minimum Performance Standard (MPS) for an Airborne AC to AC Conv
5、erterRATIONALEThis SAE Aerospace Standard (AS) establishes the minimum performance standards for an AC to AC converter power sources in aerospace electric power systems. AC to AC converters are designed and used as a subsystem to deliver various AC voltage levels within power distribution systems fo
6、r general aviation applications, cockpit lighting and aircraft cabin interiors.1. SCOPEThis SAE Aerospace Standard (AS) establishes the minimum performance standards for equipment used as secondary alternating current (AC) electrical power sources in aerospace electric power systems.1.1 PurposeThe p
7、urpose of this document is to define the guidelines and minimum performance standards to be met by static electric power converters designed to operate from primary electric power systems. The tests specified herein provide a laboratory means to determine the performance and reliability characterist
8、ics of electric power converters under electrical and environmental conditions representative of those encountered in actual aerospace applications.1.2 Field of ApplicationStatic electric power converter equipment whose initial application is to provide three phase or single phase AC power of a desi
9、red frequency by converting nominal AC power of a different frequency. The converter shall be designed to provide AC power for aerospace utilization systems and equipment, but not limited to aerospace use.2. REFERENCES2.1 Applicable DocumentsThe following publications form a part of this document to
10、 the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document
11、 takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemptionhas been obtained.2.1.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724
12、-776-4970 (outside USA), www.sae.org.AS1212 Electrical Power, Aircraft, Characteristics and Utilization OfSAE INTERNATIONAL AS6349 Page 2 of 102.1.2 U.S. Government PublicationsCopies of these documents are available online at http:/quicksearch.dla.mil.MIL-HDBK-217 Reliability Prediction of Electron
13、ic EquipmentMIL-HDBK-263 Electrostatic Discharge Control Handbook for Protection of Electrical and Electronic Parts, Assemblies and Equipment (Excluding Electrically Initiated Explosive Devices) Metric2.1.3 RTCA PublicationsAvailable from RTCA, Inc., 1150 18th Street, NW, Suite 910, Washington, DC 2
14、0036, Tel: 202-833-9339, www.rtca.org.RTCA/DO-160 Environmental Conditions and Test Procedures for Airborne Equipment2.2 Definitions2.2.1 AEROSPACE ELECTRIC POWER CONVERTEREquipment, or a combination of equipment, used to convert nominal AC aircraft power of a different frequency range to three phas
15、e or single phase AC power at 50, 60 or 400 Hz, typically.2.2.2 DEFINITION OF TERMSUnless otherwise specified herein, the terms used are those defined in RTCA Document Number DO-160.2.2.3 STATICEquipment that does not utilize mechanical devices as active components of the power conversion technology
16、.2.2.4 VARIABLE COMPONENTElectrically or mechanically adjustable component.2.2.5 ONE-THIRD UNBALANCED LOADIn a three-phase system, where two phases are carrying equal load and the third phase is carrying 1/3 phase rated load (1/9 of the products total rated load) more. For example, A-Phase: 1/3 phas
17、e rated load, B-Phase: 1/3 phase rated load, C-Phase: 2/3 phase rated load. The load on any individual phase not to exceed phase rated load. 2.2.6 TWO-THIRDS UNBALANCED LOADIn a three-phase system, where two phases are carrying equal load and the third phase is carrying 2/3 phase rated load (2/9 of
18、the products total rated load) more. For example, A-Phase: 1/3 phase rated load, B-Phase: 1/3 phase rated load, C-Phase: full phase rated load. The load on any individual phase not to exceed phase rated load.3. TECHNICAL REQUIREMENTS3.1 General3.1.1 Design and ConstructionThe design, construction, f
19、inishes, and marking shall be consistent with the standards of aerospace industry good aircraft practice. Terminals, connections, components and conductors shall be designed to preclude accidental shorting, polarity reversal, improper installation, and contact with personnel or foreign conductive ma
20、terials.SAE INTERNATIONAL AS6349 Page 3 of 103.1.2 Adjustments and ControlsControls and/or variable components that are not normally adjusted in flight shall not be readily accessible to flight personnel.3.1.3 Flammable MaterialsExcept for small parts (i.e., seals, grommets, fasteners) and other sma
21、ll electrical parts that would not contribute significantly to the propagation of a fire, all materials used in the equipment shall be non-burning or self-extinguishing and shall not release toxic gases.3.1.4 ReliabilityAs a minimum requirement, reliability predictions shall be made available. The s
22、tatistical analysis shall be based on field usage and/or reliability analysis that is completed and documented. Reference tools for this process include but may not be limited to MIL-HDBK-217.3.1.5 Handling of ProductAny special handling requirements during testing or installation of the product sha
23、ll be identified. General guidelines for ESD handling of products should be referenced to MIL-HDBK-263.3.2 Electrical Performance3.2.1 Rated Input VoltageThe rated input voltage, as measured at the converter input connector, shall be 115 V AC nominal (line to neutral for three phase input and line t
24、o line for single phase input). The converter shall be capable of continuous operation under full load without degradation of performance over an input voltage range of 100 through 122 V AC (line to neutral for three phase input and line to line for single phase input).3.2.2 Rated Input FrequencyThe
25、 rated input frequency, as measured at the converter input connector, shall be 400 Hz nominal. The converter shall be capable of continuous operation under full load without degradation of performance between 390 to 410 Hz.3.2.3 Input Momentary Power InterruptionsThe converter shall ride through or
26、automatically recover from input power interruptions (0 V RMS) beween 5 and 200 mswhile operating at full load. Compliance shall be verified with the converter operating at minimum input voltage at nominal input frequency, as specified in 3.2.1 through 3.2.2. Each test condition shall be repeated fi
27、ve times, within a 5-minute period, using 0 voltage interruption periods of 5, 10, 25, 50, 100, 150, and 200 ms for each interruption. The converter shall not be degraded or damaged as a result of momentary power interruptions.3.2.4 Input Phase Reversal (3-Phase Converters)The converter shall be des
28、igned to operate with an input phase rotation of A-B-C, and shall not be damaged with an input phase rotation of C-A-B or C-B-A. A physical means of protection, such as a keyed input connector, may be used to comply with this requirement.3.2.5 Rated Output VoltageThe average phase output voltage, un
29、der the input specified in 3.2.1 through 3.2.2 and under all conditions of test environment, shall be 3% of the rated output voltage.SAE INTERNATIONAL AS6349 Page 4 of 103.2.6 Rated Output FrequencyThe output frequency of the converter under all conditions of load and test environments shall be the
30、declared output frequency 2% Hz at the input conditions specified in 3.2.1 through 3.2.2. Typical declared output frequencies include, but are not limited to: 50 Hz, 60 Hz, 400 Hz.3.2.7 Rated Output WaveformThe output voltage waveform shall be substantially sinusoidal (crest factor of 1.41 0.15) and
31、 contain less than 6% totalharmonic distortion up to 100% rated load at the input conditions specified in 3.2.1 through 3.2.2.3.2.8 Starting Input and Output VoltagesThe converter shall be capable of starting under the input conditions specified in 3.2.1 through 3.2.2. During starting, the output vo
32、ltage shall not exceed the limits in Figure 1. For converters with nominal output voltages other than 115 V RMS the values in Figure 1 shall be multiplied by the ratio of the nominal voltage to 115 V RMS.The converter shall not be damaged when its input voltage is within limits of Figure 1.3.2.9 Rat
33、ed OverloadThe converter shall be capable of withstanding, without damage, a current overload of at least 150% for a duration of 5 minutes.3.2.10 Three-Phase Loads (3-Phase Converters)3.2.10.1 Output Phase Displacement The displacement between corresponding zero crossings of the waveform shall be be
34、tween the limits of 116 and 124degrees when operating into a balanced load.3.2.10.2 Output Phase RotationThe converter shall have phase rotation A-B-C. This shall be verified by test.3.2.10.3 Balanced Load The maximum spread in phase voltage shall not exceed 3 V RMS between the phase with the highes
35、t voltage and the phase with the lowest voltage when operating into a balanced load.3.2.10.4 Unbalanced LoadThe voltage displacement between phases (highest to lowest) shall not exceed 3 V RMS when operating into a one-third unbalanced load (see 2.2.5). Maximum output voltage between phases shall no
36、t exceed 4 V RMS when operating into a two-thirds unbalanced load (see 2.2.6).SAE INTERNATIONAL AS6349 Page 5 of 10Figure 1 Envelope of normal AC voltage transients3.3 Minimum Performance under Environmental Conditions3.3.1 TemperatureThe converter shall operate continuously without deviation from t
37、he electrical performance requirements, as defined in 3.2.5 through 3.2.7, between the temperatures of -15 and +55 C. Converter performance shall be unaffected by changes in temperature of 2 C per minute. The converter shall endure, without damage, non-operational exposure between the temperature ex
38、tremes of -55 and +85 C.3.3.2 AltitudeThe converter shall operate continuously without deviation from the electrical performance requirements, as defined in 3.2.5 through 3.2.7, between 0 feet (101.32 kPa) and +15000 feet (57.18 kPa).3.3.3 HumidityThe converter shall endure, without damage or degrad
39、ation, non-operational exposure to relative humidity up to 99%. Following exposure, the converter shall operate in accordance with the electrical performance requirements, as defined in 3.2.5 through 3.2.7.3.3.4 ShockThe converter shall operate without deviation from the electrical performance requi
40、rements, as defined in 3.2.5 through 3.2.7, while being subjected to a total of eighteen 9 g saw tooth shock pulses having a time duration of 11 ms 1 ms. Three shock pulses shall be applied in the positive and negative polarities along each orthogonal axis.SAE INTERNATIONAL AS6349 Page 6 of 103.3.5
41、VibrationThe converter shall operate without deviation from the electrical performance requirements, as defined in 3.2.5 through 3.2.7, while being subjected to either sinusoidal or random vibration as defined by RTCA/DO-160, Figure 8-3 (Curve M) and Figure 8-1 (Curve B), respectively. More stringen
42、t RTCA/DO-160 or aircraft-specific levels may be used as substitutes for Curve M or Curve B2 compliance.3.3.6 Voltage SpikeThe converter shall endure, without damage or degradation, input voltage spikes with a peak voltage of two times the typical line voltage or 200 V RMS, whichever is less, occuri
43、ng 2 microseconds into the transient. The specified voltages and durations are for open circuit conditions only and may be lower with the equipment connected. Following exposure, the converter shall operate in accordance with the electrical performance requirements, as defined in 3.2.5 through 3.2.7
44、.3.3.7 Audio Frequency Conducted SusceptibilityThe converter shall accept frequency components of a magnitude defined in RTCA/DO-160, Section 18, Category R(CF). This requirement only applies to the input power leads of the converter. During exposure, the converter shall operate in accordance with t
45、he electrical performance requirements, as defined in 3.2.5 through 3.2.7.3.3.8 Induced Signal Susceptibility3.3.8.1 Magnetic FieldsThe converter shall operate without deviation from the electrical performance requirements, as defined in 3.2.5 through 3.2.7, while being exposed to an audio frequency
46、 magnetic field generated by 20 Arms, 400 Hz through a straight wire radiator within a distance of 0.15 m from the exterior of the converter.3.3.8.2 Electric FieldsThe converter shall operate without deviation from the electrical performance requirements, as defined in 3.2.5 through 3.2.7, while bei
47、ng exposed to an audio frequency electric field generated by 170 V RMS through a straight wire radiator of 0.20 m located within a distance of 0.01 m from the exterior of the converter. 3.3.9 Radio Frequency Susceptibility (Conducted and Radiated)3.3.9.1 ConductedThe converter shall operate without
48、deviation from the electrical performance requirements, as defined in 3.2.5 through 3.2.7, while its power and interconnecting wire bundle(s) are individually exposed to radio frequency levels defined in RTCA/DO-160, Section 20, Category S over a frequency range of 10 kHz to 400 MHz. More stringent
49、RTCA/DO-160 or aircraft-specific levels may be used as substitutes for Category S compliance.3.3.9.2 RadiatedThe converter shall operate without deviation from the electrical performance requirements, as defined in 3.2.5 through 3.2.7, while exposed to radio frequency electric fields as defined in RTCA/DO-160, Section 21, Category S over a frequency range of 100 MHz to 2 GHz. More stringent RTCA/DO-160 or aircraft-specific
