Australian Standard. Disturbances in mains supply networks. Part 2: Limitation of harmonics caused by industrial equipment AS PDF

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AS Australian Standard Disturbances in mains supply networks Part 2: Limitation of harmonics caused by industrial equipment This Australian Standard was prepared by Committee EL/34, Electric
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AS Australian Standard Disturbances in mains supply networks Part 2: Limitation of harmonics caused by industrial equipment This Australian Standard was prepared by Committee EL/34, Electric Waveform Distortion. It was approved on behalf of the Council of Standards Australia on 15 March 1991 and published on 13 May The following interests are represented on Committee EL/34: Australian Electrical and Electronic Manufacturers Association Bureau of Steel Manufacturers of Australia Confederation of Australian Industry Department of Defence Electricity Supply Association of Australia Institution of Engineers, Australia Institution of Radio and Electronics Engineers, Australia Monash University Railways of Australia Committee Telecom Australia University of Sydney University of Wollongong Water Board, Sydney Review of Australian Standards. To keep abreast of progress in industry, Australian Standards are subject to periodic review and are kept up to date by the issue of amendments or new editions as necessary. It is important therefore that Standards users ensure that they are in possession of the latest edition, and any amendments thereto. Full details of all Australian Standards and related publications will be found in the Standards Australia Catalogue of Publications; this information is supplemented each month by the magazine The Australian Standard, which subscribing members receive, and which gives details of new publications, new editions and amendments, and of withdrawn Standards. Suggestions for improvements to Australian Standards, addressed to the head office of Standards Australia, are welcomed. Notification of any inaccuracy or ambiguity found in an Australian Standard should be made without delay in order that the matter may be investigated and appropriate action taken. AS Australian Standard Disturbances in mains supply networks Part 2: Limitation of harmonics caused by industrial equipment First published as AS Second edition PUBLISHED BY STANDARDS AUSTRALIA (STANDARDS ASSOCIATION OF AUSTRALIA) 1 THE CRESCENT, HOMEBUSH, NSW 2140 ISBN PREFACE This Standard was prepared by the Standards Australia Committee on Electric Waveform Distortion. It is one part of a Standard on disturbances in mains supply networks, the four parts being as follows: Part 1 Limitation of harmonics caused by household and similar electrical appliances Part 2 Limitation of harmonics caused by industrial equipment Part 3 Limitation of voltage fluctuations caused by household and similar electrical appliances Part 4 Limitation of voltage fluctuations caused by industrial equipment This Standard should be read in conjunction with the Regulations, Service Rules and Installation Rules of the supply authority approving the connection. Part 2 of this Standard applies to equipment intended for industrial, professional and commercial purposes, and household appliances rated above 4.8 kv.a and provides guidance, for electricity suppliers, manufacturers of electrical appliances or equipment and users of the appliance or equipment, on tolerable harmonic content which may be produced by the appliance or equipment. The use of a common Standard by all parties is intended to improve the electromagnetic compatibility of electrical equipment connected to the mains, by the reduction of interfering waveforms and disturbances. Part 2 provides guidance on the maximum power of harmonic producing equipment that may be supplied from high and low voltage electricity supply systems and on the limits of harmonic voltage which may be caused at the point of common coupling. In the preparation of Part 2, close attention was given to Engineering Recommendations G5/3 Limits for Harmonics in the U.K. Electricity Supply System and VDE Specification 0160 Specification of Electrical Equipment for Electrical Power Installations with Electronic Devices. Acknowledgment is made of the assistance received from these sources. Consideration should be given to the Electricity Supply Association s (ESAA) Publication D(b) , Wave Form Distortion Guidelines, to avoid interference to telecommunication networks and ripple control systems. CONTENTS Page FOREWORD SCOPE REFERENCED DOCUMENTS GENERAL DEFINITIONS HARMONIC LIMITS EFFECTIVE HARMONIC VOLTAGE DISTORTION IMPLEMENTATION OF PART APPENDIX A HARMONIC VOLTAGE DISTORTION Copyright STANDARDS AUSTRALIA Users of Standards are reminded that copyright subsists in all Standards Australia publications and software. Except where the Copyright Act allows and except where provided for below no publications or software produced by Standards Australia may be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from Standards Australia. Permission may be conditional on an appropriate royalty payment. Requests for permission and information on commercial software royalties should be directed to the head office of Standards Australia. Standards Australia will permit up to 10 percent of the technical content pages of a Standard to be copied for use exclusively in house by purchasers of the Standard without payment of a royalty or advice to Standards Australia. Standards Australia will also permit the inclusion of its copyright material in computer software programs for no royalty payment provided such programs are used exclusively in house by the creators of the programs. Care should be taken to ensure that material used is from the current edition of the Standard and that it is updated whenever the Standard is amended or revised. The number and date of the Standard should therefore be clearly identified. The use of material in print form or in computer software programs to be used commercially, with or without payment, or in commercial contracts is subject to the payment of a royalty. This policy may be varied by Standards Australia at any time. 3 AS FOREWORD Much industrial electrical equipment includes electronic power supplies and control devices which may introduce disturbances into the mains supply network to which it is connected. In particular, equipment incorporating phase-control or burst-firing circuits may produce substantial harmonics and voltage fluctuations. Equipment with asymmetrical control devices also produces d.c. in the supply system. Such electrical equipment should not be permitted to affect adversely the supply network characteristics, the supply voltage, or the performance of any other equipment connected to the supply network. Provision must, therefore, be made to limit such disturbing effects to achieve electromagnetic compatibility (EMC) between this equipment and other electrical equipment. COPYRIGHT AS STANDARDS AUSTRALIA Australian Standard Disturbances in mains supply networks Part 2 Limitation of harmonics caused by industrial equipment 1 SCOPE Part 2 of this Standard provides guidance on the maximum size of harmonic producing industrial equipment that may be supplied from high or low voltage electricity supply systems and on the limits, of harmonic voltage distortion resulting at the point of common coupling, appropriate to the equipment. Part 2 of this Standard is applicable to all electrical equipment other than that covered by Part 1. In particular, Part 2 is intended for application where one or more of the following conditions apply: (a) The equipment is intended for industrial, professional or commercial purposes. (b) Consent from a supply authority is required before the equipment can be connected to the supply system. (c) The voltage at the point of common coupling (see Clause 4.1) is greater than 240/415 V. (d) Appliances are rated above 4.8 kv.a. 2 REFERENCED DOCUMENTS The following document is referred to in this Standard: AS 3100 Approval and test specification Definitions and general requirements for electrical materials and equipment 3 GENERAL 3.1 Guidance The limits contained in Part 2 have been based on certain simplifying assumptions. They are a guide to good engineering practice when handling harmonic voltage distortion. This guide covers up to the 40th harmonic but, in general, measurements of harmonics greater than the 25th should not be required unless higher frequency harmonics are of particular interest or it is suspected that significant higher order harmonics exist. Adherence to the recommended values should reduce the risks of damage to, or malfunctioning of, other consumers or the supply authorities equipment, or overloading of a section of the network due to resonances. The limits of voltage distortion are given quantitatively in terms of maximum individual harmonic currents because most instances of voltage distortion are the result of harmonic currents. Voltage distortion at frequencies close to a harmonic frequency should be treated in a similar fashion to that of the harmonic frequency. Part 2 of this Standard is confined to matters related to harmonic voltage distortion but other aspects of system disturbance such as sub-harmonic disturbances, voltage fluctuation and light flicker may impose additional or overriding limitations. 3.2 Supply authority right of approval Part 2 of this Standard shall not override the Regulations, Service Rules and Installation Rules of the supply authority which will approve the connection of the equipment. The limits contained in Part 2 apply directly to equipment without mains connected harmonic filters containing resonating elements; such filters should only be connected in consultation with the appropriate supply authority. NOTE: Supply authorities may impose additional limits on harmonics of specific order to avoid interference to telecommunication networks or to ripple control systems. 4 DEFINITIONS For the purpose of Part 2 the following definitions apply: 4.1 Point of common coupling (PCC) the point in the public supply network, electrically nearest to the consumer in whose installation the appliance under consideration is, or is to be, connected, at which other consumers installations are, or may be, connected. 4.2 Harmonics sinusoidal quantities, the frequencies of which are whole multiples of a frequency selected as the fundamental. NOTE: For this Standard the fundamental frequency is the supply system frequency, i.e. 50 Hz. 4.3 Harmonic distortion the departure of a waveform from sinusoidal shape, caused by the addition of one or more harmonics to the fundamental. COPYRIGHT The remainder of this document is available for purchase online at SAI Global also carries a wide range of publications from a wide variety of Standards Publishers: Click on the logos to search the database online.
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