IEC_TR_61000-4-40-2020.pdf

IEC TR 61000-4-40 Edition 1.0 2020-03 TECHNICAL REPORT Electromagnetic compatibility(EMC)Part 4-40:Testing and measurement techniques Digital methods for the measurement of power quantities of modulated or distorted signals IEC TR 61000-4-40:2020-03(en)colourinside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2020 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,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 IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb infoiec.ch CH-1211 Geneva 20 www.iec.ch Switzerland About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigendum or an amendment might have been published.IEC publications search-webstore.iec.ch/advsearchform The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and once a month by email.IEC Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:salesiec.ch.Electropedia-www.electropedia.org The worlds leading online dictionary on electrotechnology,containing more than 22 000 terminological entries in English and French,with equivalent terms in 16 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC Glossary-std.iec.ch/glossary 67 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC TR 61000-4-40 Edition 1.0 2020-03 TECHNICAL REPORT Electromagnetic compatibility(EMC)Part 4-40:Testing and measurement techniques Digital methods for the measurement of power quantities of modulated or distorted signals INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.100.01 ISBN 978-2-8322-7907-6 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinside 2 IEC TR 61000-4-40:2020 IEC 2020 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Terms and definitions.7 4 General.7 5 Modulated sine waveforms used in this document to compare measurement algorithms.9 5.1 General.9 5.2 Half-wave rectification.10 5.3 Full-wave rectification.10 5.4 Multi-cycle symmetrical control.11 5.5 Random on-off control.12 6 Measurement algorithms.12 6.1 General.12 6.2 Averaging algorithms.12 6.2.1 General.12 6.2.2 Performance of the averaging algorithm.13 6.2.3 Instrumental errors of the averaging algorithm.18 6.3 Smoothing filter algorithm.19 6.3.1 Frequency and step response.19 6.3.2 Verification of the smoothing filter algorithm.21 6.3.3 Instrumental errors of the filtering algorithm.25 7 Conclusions.25 Annex A(informative)Smoothing filter studied in this document.27 A.1 Algorithm.27 A.2 General C+class program code.31 Bibliography.34 Figure 1 Typical resistive load current and supply voltage waveform of half-wave rectification.10 Figure 2 Typical full-bridge rectifier current and supply voltage waveforms.11 Figure 3 Current and voltage patterns in an MCSC circuit,(left)1/3 MCSC and(right)2/3 MCSC.11 Figure 4 Amplitude of 50 Hz current with on and off periods varying within a 1 min to 2 min range.12 Figure 5 Step response of an algorithm in Formula(6)with a half-cycle,1-cycle and 10-cycle measurement interval.14 Figure 6 RMS current and active power for half-wave rectification.15 Figure 7 Sliding average RMS current and active power of a device controlled with a 1/3 MCSC circuit.15 Figure 8 Worst case 1/3 MCSC circuit active power calculation variation.16 Figure 9 Example of a 10 min sliding average power calculation for a load having a 92 s period.17 Figure 10 Active power of randomly fluctuating load averaged over a sliding 10 min interval.18 IEC TR 61000-4-40:2020 IEC 2020 3 Figure 11 Sensitivity of the full-bridge rectifier RMS current and active power measurem