IEC_60076-10ed1.0en.pdf

INTERNATIONALSTANDARDIEC60076-10First edition2001-05Power transformers Part 10:Determination of sound levelsTransformateurs de puissance Partie 10:Dtermination des niveaux de bruitReference numberIEC 60076-10:2001(E)Publication numberingAs from 1 January 1997 all IEC publications are issued with a designation in the60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editionsThe IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,thebase publication incorporating amendment 1 and the base publication incorporatingamendments 1 and 2.Further information on IEC publicationsThe technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating tothis publication,including its validity,is available in the IEC Catalogue ofpublications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertakenby the technical committee which has prepared this publication,as well as the listof publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publicationsThe on-line catalogue on the IEC web site(www.iec.ch/catlg-e.htm)enablesyou to search by a variety of criteria including text searches,technicalcommittees and date of publication.On-line information is also available onrecently issued publications,withdrawn and replaced publications,as well ascorrigenda.IEC Just PublishedThis summary of recently issued publications(www.iec.ch/JP.htm)is alsoavailable by email.Please contact the Customer Service Centre(see below)forfurther information.Customer Service CentreIf you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.chTel:+41 22 919 02 11Fax:+41 22 919 03 00INTERNATIONALSTANDARDIEC60076-10First edition2001-05Power transformers Part 10:Determination of sound levelsTransformateurs de puissance Partie 10:Dtermination des niveaux de bruitPRICE CODE IEC 2001 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission3,rue de Varemb Geneva,SwitzerlandTelefax:+41 22 919 0300e-mail:inmailiec.ch IEC web site http:/www.iec.chVFor price,see current catalogue Commission Electrotechnique Internationale International Electrotechnical Commission 2 60076-10 IEC:2001(E)CONTENTSFOREWORD.3INTRODUCTION.51Scope.72Normative references.73Definitions.84Instrumentation and calibration.95Choice of test method.96Load conditions.96.1General.96.2No-load current and rated voltage.106.3Rated current and short-circuit voltage.106.4Reduced-load current.117Principal radiating surface.117.1General.117.2Transformers with or without cooling auxiliaries,dry-type transformers in enclosuresand dry-type transformers with cooling auxiliaries inside the enclosure.117.3Cooling auxiliaries mounted on a separate structure spaced 3 m away fromthe principal radiating surface of the transformer.117.4Dry-type transformers without enclosures.118Prescribed contour.129Microphone positions.1210Calculation of the area of the measurement surface.1210.1 Measurements made at 0,3 m from the principal radiating surface.1210.2 Measurements made at 2 m from the principal radiating surface.1310.3 Measurements made at 1 m from the principal radiating surface.1310.4 Measurements on test objects where safety clearance considerations requirea measurement distance which for all or part of the prescribed contour(s)exceeds the provisions of 10.1 to 10.3.1311Sound pressure method.1311.1 Test environment.1311.2 Sound pressure level measurements.1611.3 Calculation of average sound pressure level.1612Sound intensity method.1812.1 Test environment.1812.2 Sound intensity level measurements.1812.3 Calculation of average sound intensity level.1813Calculation of sound power level.1914Addition of no-load and load current sound power levels.2015Far-field calculations.2016Presentation of results.20Annex A(informative)Narrow-band and time-synchronous measurements.29Annex B(informative)Typical report of sound level determination.3160076-10 IEC:2001(E)3 INTERNATIONAL ELECTROTECHNICAL COMMISSION_POWER TRANSFORMERS Part 10:Determination of sound levelsFOREWORD1)The IEC(International Electrotechnical Commission)is a worldwide organization for standardization comprisingall national electrotechnical committees(IEC National Committees).The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields.Tothis end and in addition to other activities,the IEC publishes International Standards.Their preparation isentrusted