1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 12384:2010Aerospace Requirementsfor digital equipment formeasurements of aircraftelectrical power characteristicsBS ISO 12384:2010 BRITISH STANDARDNational forewordThis Br
2、itish Standard is the UK implementation of ISO 12384:2010.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/6, Aerospace avionic electrical and fibre optictechnology.A list of organizations represented on this committee can beobtained on request to its secretary.This pu
3、blication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 66536 3ICS 49.060Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the aut
4、hority of theStandards Policy and Strategy Committee on 31 December 2010.Amendments issued since publicationDate Text affectedBS ISO 12384:2010Reference numberISO 12384:2010(E)ISO 2010INTERNATIONAL STANDARD ISO12384First edition2010-11-15Aerospace Requirements for digital equipment for measurements
5、of aircraft electrical power characteristics Constructions arospatiales Exigences relatives aux quipements numriques de mesure des caractristiques de puissance lectrique bord des aronefs BS ISO 12384:2010ISO 12384:2010(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance wit
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8、y care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2010 All rights reserved. Unless otherwise specifie
9、d, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case
10、postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 12384:2010ISO 12384:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative r
11、eferences1 3 Terms and definitions .1 4 Symbols1 5 Measurement requirements for the aircraft electric power characteristics3 5.1 General rules, measurement states and the admissible errors of the measurement results .3 5.1.1 General .3 5.1.2 Measurement states3 5.1.3 Admissible errors of the measure
12、ment results3 5.2 Measurement of constant frequency (CF) a.c. power system characteristics4 5.2.1 Steady state characteristics.4 5.2.2 Transient characteristics8 5.3 Measurement of variable frequency (VF) a.c. power system characteristics .8 5.4 Measurement of d.c. power system characteristics (28 V
13、 or 42 V system).8 5.4.1 Steady state characteristics.8 5.4.2 Transient d.c. voltage10 5.5 Measurement of current parameter.10 5.6 Measurement of power transfer characteristics 10 5.7 Measurement of voltage spike characteristics 10 5.8 Measurement of power factor 10 6 General requirements for the me
14、asuring equipment 11 6.1 Applicability .11 6.1.1 Efficiency11 6.1.2 Operating environment.11 6.2 Performance and functions11 6.2.1 Accuracy 11 6.2.2 Scope of the measuring equipment 11 6.2.3 Measurement resolution.11 6.2.4 Input impedance 11 6.2.5 Sampling frequency range .12 6.3 Electromagnetic com
15、patibility .12 6.4 Human-machine interface project .12 6.5 The regulation of select measuring equipment .12 6.5.1 The measurement regulation of the data process software .12 6.5.2 Selecting requirement.12 Bibliography13 BS ISO 12384:2010ISO 12384:2010(E) iv ISO 2010 All rights reservedForeword ISO (
16、the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical commi
17、ttee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotec
18、hnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the membe
19、r bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifyin
20、g any or all such patent rights. ISO 12384 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 1, Aerospace electrical requirements. ISO 12384 is closely allied with ISO 1540 and references from one to the other are freely used, particularly from ISO 12384 to
21、ISO 1540. The proper use of this International Standard through referencing the applicable specific digital measurement methods should simplify the preparation of specifications and help to expedite the purchase and acceptance of the digital measuring equipment. BS ISO 12384:2010ISO 12384:2010(E) IS
22、O 2010 All rights reserved vIntroduction Various types of digital measuring equipment for electrical power characteristics are applied to the aircraft electrical system. There is no International Standard for digital measuring equipment for electrical power characteristics in the aerospace industry.
23、 The purpose of this International Standard is to explain, establish and standardize specific methods for digital measurements of the aircraft electrical system. The intended use of this International Standard is to define how to measure parameters of electrical characteristics in aircraft electrica
24、l power systems. The specific measurement methods are included here, while the terminology and general methods of digital measurement and signal processing are also presented. The requirements of digital measuring equipment are verified by testing of the aircraft electrical system. BS ISO 12384:2010
25、BS ISO 12384:2010INTERNATIONAL STANDARD ISO 12384:2010(E) ISO 2010 All rights reserved 1Aerospace Requirements for digital equipment for measurements of aircraft electrical power characteristics 1 Scope This International Standard specifies the requirements for digital measuring methods and digital
26、measuring equipment for aircraft electrical power characteristics, including accuracy, algorithms and digital measuring equipment. The measuring equipment should be applied mainly for the use of laboratory or rig tests. This International Standard can be applied to digital measuring equipment which
27、is involved in the measurement of power electrical characteristics of the power supply system, power distributing systems and the utilization of equipment in aircrafts. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated referen
28、ces, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1540, Aerospace Characteristics of aircraft electrical systems ISO 7137, Aircraft Environmental conditions and test procedures for airborne equipment 3 T
29、erms and definitions For the purposes of this document, the terms and definitions given in ISO 1540 and the following apply. 3.1 sampling frequency reciprocal of sampling interval time 3.2 sampling time total of sampling interval time 4 Symbols Symbols used by this International Standard are listed
30、in Table 1. BS ISO 12384:2010ISO 12384:2010(E) 2 ISO 2010 All rights reservedTable 1 Symbols and definitions Symbol Unit Definition FPpower factor FCcrest factor f Hz steady state frequency fmHz frequency modulation I A steady state a.c. current ijA instantaneous value of a.c. current j sampling ser
31、ial, j = 1,2,3, . n Fd% a.c. voltage distortion factor n total number of sampling points during the steady state time N cycle numbers during TWT sampling period Tws time of a period not to exceed one second Ts difference in time between the fundamental components of any two normalized phase voltages
32、 taken at consecutive zero crossings traced in the negative to positive direction ts difference in time between the fundamental components of any two phase voltages taken at consecutive zero crossings traced in the negative to positive direction U V steady state phase voltage UA, UB, UCV phase A, B
33、and C steady state voltage UdV distortion of a.c. voltage UAdcV d.c. component of a.c. voltage UjV rms value corresponding to the jthcycle UPV peak value of a.c. voltage for each cycle UrmV voltage ripple Umvoltag modulation Unnthharmonic rms value of current or voltage UdcV steady state d.c. voltag
34、e UfV rms value of fundamental component of a.c. voltage UV voltage imbalance UDV rms value of a.c. distortion voltage DTH% total harmonic distortion ujV instantaneous value of a.c. voltage uDjV instantaneous value of a.c. distortion voltage udmaxV maximum value of cyclic variation in relation to th
35、e mean level of d.c. voltage during steady state operation udminV minimum value of cyclic variation in relation to the mean level of d.c. voltage during steady state operation udcjV instantaneous value of d.c. voltage UDdcV distortion of the d.c. voltage Fddc% d.c. voltage distortion factor t s samp
36、ling interval time phase voltage displacement BS ISO 12384:2010ISO 12384:2010(E) ISO 2010 All rights reserved 35 Measurement requirements for the aircraft electric power characteristics 5.1 General rules, measurement states and the admissible errors of the measurement results 5.1.1 General The elect
37、ric power characteristics measurement shall be implemented in accordance with the definitions of ISO 1540 and the requirements of this International Standard. 5.1.2 Measurement states 5.1.2.1 Steady state The measurement of steady state parameters shall be processed only when negligible changes in e
38、lectrical parameters appear. For example, no load state, rated load state, etc. 5.1.2.2 Transient state The measurement of transient state parameters shall be processed in the transient state. Momentary variations of a characteristic from its steady state limits, and back to its steady state limits
39、may occur as a result of a system disturbance. For example, apply the load immediately, switch from one load to another load, power bus or power source switching, building up and shut down power source, etc. The whole transient procedure should be tested. 5.1.3 Admissible errors of the measurement r
40、esults 5.1.3.1 Steady state characteristics When measuring voltages and currents within the range of waveform characteristics allowed in ISO 1540, the steady state measurement error shall meet the following requirements: a) voltage: 1) steady state a.c. and d.c. voltage: in the range of measurement,
41、 the absolute error of readings shall be in the range of 0,5 %; 2) D.C. component of the a.c. voltage: the absolute error of readings shall be in the range of 10 %; b) current: 1) steady state a.c. current: in the range of measurement, the absolute error of readings shall be in the range of 1 %; 2)
42、steady state d.c. current: in the range of measurement, the absolute error of readings shall be in the range of 0,8 %; c) frequency: the a.c. system: in the range of measurement, the absolute error of readings shall be in the range of 0,1 % of the nominal frequency; d) phase difference: in the condi
43、tion that the voltage phase difference is in the range of 110130, the absolute error of readings shall be in the range between 0,2; BS ISO 12384:2010ISO 12384:2010(E) 4 ISO 2010 All rights reservede) amplitude of distortion spectrum: the absolute error shall be in the range between 5% of limited val
44、ue. 5.1.3.2 Transient characteristics Measurement error of the transient characteristics should meet the following requirements: a) voltage: 1) a.c. voltage: in the range of measurement, the absolute error of readings shall be in the range of 1,0 % of the specified maximum transient a.c. voltage; 2)
45、 d.c. voltage: in the range of measurement, the absolute error of readings shall be in the range of 1,0 % of the specified maximum transient d.c. voltage; 3) d.c. content of the a.c. voltage: absolute error of readings shall be in the range of 10 % of the specified maximum transient d.c content volt
46、age; b) current: 1) a.c. current: in the range of measurement, the absolute error of readings shall be in the range of 2 % of the specified maximum transient a.c. current; 2) d.c. current: in the range of measurement, the absolute error of readings shall be in the range of 2 % of the specified maxim
47、um transient d.c. current; c) frequency: in the range of measurement, the absolute error of readings shall be in the range of 0,2 % of the specified maximum frequency. 5.2 Measurement of constant frequency (CF) a.c. power system characteristics 5.2.1 Steady state characteristics 5.2.1.1 Phase voltag
48、e The measurement of the phase voltage should be processed according to the following: a) sampling frequency on each phase voltage not less than 72 kHz; b) the three phase voltages sampled at the same time; c) sampling time over a period not to exceed one second. Calculate the steady state phase vol
49、tage according to Equation (1): 2w11njjUuT=t (1) where U is steady state phase voltage, V; Twis the time of a period not to exceed one second, s; BS ISO 12384:2010ISO 12384:2010(E) ISO 2010 All rights reserved 5n is the number of samples; j is sample serial, j = 1，2，3 n; ujis the instantaneous value of a.c. voltage, V; t is the sampling interval time, s. 5.2.1.2 Phase voltage imbalance The measurement of the voltage imbalance should be processed according to the following requirements: a) calcul
