08-30182014-DC.pdf
Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 08/30182014 DC Date: 22 December 2008 Origin: International Latest date for receipt of comments: 20 February 2009 Project no.: 2008/01486 Responsible committee: PEL/2 Rotating electrical machinery Interested committees: Title: Draft BS EN TS 60034-24 Rotating electrical machines Part 24: Detection and diagnosis of potential failures at the active par ts of rotating electrical machines and of bearing currents - Application guide Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 20 February 2009. 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Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsigroup.com. Direct tel: 020 8996 7288 Responsible Committee Secretary: Mr K Stiles (BSI) E-mail: keith.stilesbsigroup.com a Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:54, Uncontrolled Copy, (c) BSI Introduction This draft standard is based on international discussions in which the UK has taken an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent standard. There is a high probability that this text could be adopted by CENELEC as a reference document for harmonization or as a European Standard. Recipients of this draft are requested to comment on the text bearing in mind this possibility. 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Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. b Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:54, Uncontrolled Copy, (c) BSI 2/1537/DTS DRAFT TECHNICAL SPECIFICATION Project number IEC TS 60034-24 Ed 1.0 IEC/TC or SC TC 2 Secretariat United Kingdom Distributed on 2008-12-19 Voting terminates on 2009-03-20 Also of interest to the following committees Supersedes document 2/1498/CD and 2/1528/CC Functions concerned Safety EMC Environment Quality assurance THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT SHOULD NOT BE USED FOR REFERENCE PURPOSES. RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. Title IEC TS 60034-24: Rotating electrical machines Part 24: Online detection and diagnosis of potential failures at the active parts of rotating electrical machines and of bearing currents - Application guide CEI 60034-24 : Machines électriques tournantes Partie 24 : Détection et diagnostic en ligne de défaillances potentielles des parties actives de machines électriques tournantes et de courants de palier - Guide d'application FORM DTS (IEC) 2002-08-09 Copyright © 2008 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions. You may not copy or “mirror“ the file or printed version of the document, or any part of it, for any other purpose without permission in writing from IEC. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:54, Uncontrolled Copy, (c) BSI 2/1537/DTS 2 CONTENTS 1 Scope.6 2 Normative references .6 3 Terms and definitions .6 3.1 Distribution factor6 3.2 Chording (pitch) factor.6 3.3 Branch factor.7 4 Basis of the diagnosis 7 5 Kinds of electrical signal analysis .7 5.1 General remarks7 5.2 Stator current/voltage analysis 7 5.3 Induced voltages of auxiliary turns embedded into the stator slots or other magnetic sensors sensing the air-gap flux.8 5.4 Induced voltages of search coils collecting axial fluxes9 5.5 Shaft voltage analysis .10 6 Detection of bearing currents10 Annex A: Bibliography.15 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:54, Uncontrolled Copy, (c) BSI 2/1537/DTS 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ROTATING ELECTRICAL MACHINES Part 24: Online detection and diagnosis of potential failures at the active parts of rotating electrical machines and of bearing currents Application guide FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee may propose the publication of a technical specification when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts, or The subject is still under technical development or where, for any other reason, there is the future but no immediate possibility of an agreement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International Standards. IEC 60034-24, which is a technical specification, has been prepared by IEC technical committee 2: Rotating machinery. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:54, Uncontrolled Copy, (c) BSI 2/1537/DTS 4 The text of this technical specification is based on the following documents: Enquiry draft Report on voting XX/XX/DTS XX/XX/RVC Full information on the voting for the approval of this technical specification can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. NOTE: A table of cross-references of all IEC TC 2 publications can be found in the IEC TC 2 dashboard on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date1) indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. 1) The National Committees are requested to note that for this publication the maintenance result date is 2012. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:54, Uncontrolled Copy, (c) BSI 2/1537/DTS 5 Introduction The progress in design and technology resulted in an increasing reliability of rotating electrical machines, but failures could not be eliminated completely. Since the demand for a high availability is permanently increasing, it is essential to detect deficiencies at an early stage and to recognize the origin of the fault in order to estimate the risk of a continuation of operation. It would be advantageous, if the signals which are obtained by the detection methods presented in this guide, are suitable to distinguish the different failures from each other. By this means, the signal analysis can be used as input data of a complete monitoring system. The aim of this guide is to demonstrate all possible tools which are available for the intended purpose and to explain their advantages and disadvantages. The minimum requirements which must be met by the various sensors will be discussed, whereas the detailed design rules of it are outside the scope of this document. This guide deals with the detection of failures at the active parts of multi-phase rotating machines (all kinds of winding faults in stator and rotor, cage deficiencies, eccentricities) and of bearing currents. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:54, Uncontrolled Copy, (c) BSI 2/1537/DTS 6 ROTATING ELECTRICAL MACHINES Part 24: Online detection and diagnosis of potential failures at the active parts of rotating electrical machines and of bearing currents Application guide 1 Scope This part of IEC 60034 is applicable to the on-line detection and diagnosis of failures at the active parts of multi-phase rotating electrical machines (induction and synchronous machines) and of bearing currents. The failure analysis includes: - interturn faults - phase-to-phase short-circuits - double earth faults and single earth faults of motors with earth connection of the star- point - static and dynamic eccentricities - cage imperfection (e.g. broken bars or end-rings) - bearing currents This can be achieved by tools like search coils or other magnetic sensors or partly by the analysis of the terminal voltages and currents. The detection of the following effects is excluded from the scope: - vibration (covered by ISO standards, e.g. ISO 10816 and ISO 7919) - partial discharge (covered by IEC 60034-27) - single earth-faults of motors without earth connection of the star-point - core imperfection Also excluded are special methods applicable for specific applications only (e.g. turbo generators). 2 Normative references None. 3 Terms and definitions 3.1 Distribution factor The factor, related to a distributed winding, wh
