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  • AS 2374.6-1994

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Power transformers - Determination of transformer and reactor sound levels

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  30-06-2017

    Language(s): 

    Published date:  01-01-1994

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    1 - AS 2374.6-1994 Power transformers - Determination of transformer and reactor sound levels
    4 - PREFACE
    5 - CONTENTS
    7 - 1. Scope
    7 - 2. Definitions
    7 - 2.1 Sound pressure level, Lp
    7 - 2.2 A-weighted surface sound pressure level, L pA
    8 - 2.3 Sound power level, LW
    8 - 2.4 Principal radiating surface
    8 - 2.5 Prescribed contour
    8 - 2.6 Measurement surface
    8 - 2.7 Measurement distance
    8 - 2.8 Background noise
    8 - 3. Instruments
    8 - 4. Conditions for measurement
    8 - 4.1 Criteria for adequacy of the test environment
    9 - 4.2 Operating conditions of equipment during measurement
    9 - 4.3 Quantities to be measured
    9 - 5. Measurement of sound pressure levels
    9 - 5.1 Background noise measurement
    10 - 5.2 Sound pressure level measurements for the transformer
    12 - 5.3 Corrections for background noise
    13 - 6. Calculation of surface sound pressure level and sound power level
    13 - 6.1 Calculation of surface sound pressure level
    13 - 6.2 Calculation of the area of the measurement surface
    14 - 6.3 Calculation of sound power level
    15 - 7. Presentation of results
    24 - APPENDIX A - TEST ENVIRONMENT QUALIFICATION PROCEDURE
    24 - A1. General
    24 - A2. Environmental conditions
    24 - A2.1 Types of reflecting planes
    24 - A2.2 Reflecting objects
    25 - A2.3 Precautions for outdoor measurements
    25 - A3. Qualification procedure and requirements for test rooms
    25 - A3.1 Test procedures
    26 - A3.2 Qualification requirements for test rooms
    27 - A4. Qualification requirements for outdoor spaces
    27 - A5. Alternative test procedure
    28 - APPENDIX AA - SPECIFIED SOUND LEVELS FOR TRANSFORMERS
    28 - AA1 SCOPE
    28 - AA2 STANDARD SOUND POWER LEVELS (A WEIGHTED SCALE)
    28 - AA3 APPLICATION
    28 - AA4 DERIVATION
    30 - APPENDIX B - DERIVATION OF SOUND POWER LEVEL FROM SOUND INTENSITY MEASUREMENTS
    30 - B.1 General
    30 - B.2 Definitions
    31 - B.3 Instruments
    32 - B.4 Conditions for measurement
    32 - B.5 Measurement of sound intensity
    34 - B.6 Calculation of the sound power level from the surface sound intensity level
    34 - B.7 Presentation
    35 - APPENDIX C - DETERMINATION OF SOUND POWER LEVEL DUE TO LOAD CURRENTS
    35 - C.1 General
    35 - C.2 Operating conditions of the transformer during measurement
    35 - C.3 Measurement of transformer sound power level
    36 - C.4 Calculation of sound power level from measurement at reduced current
    36 - C.5 Addition of no-load and load noise levels

    Abstract - (Show below) - (Hide below)

    Defines sound power versus sound pressure and sets out the methods by which the sound power levels of transformers, reactors, and their associated cooling equipment shall be determined. Standard and reduced sound power level limits for transformers only have been added in an Australian Appendix. Technically equivalent to IEC 551:1987, with the addition of Appendix AA.

    Scope - (Show below) - (Hide below)

    This standard defines the methods by which the sound levels of transformers, reactors and their associated cooling equipment shall be determined so that compliance with any specification requirements may be confirmed and the characteristics of the noise emitted in service determined.This standard is intended to apply to measurements made in the manufacturer's works since conditions may be very different when measurements are made on site because of the proximity of other objects, background extraneous noises, etc. Nevertheless, the same general rules as are given herein may be followed when on-site measurements are made.In those cases where sufficient power is available in the factory to permit full energization of reactors, the methods to be followed are the same as for transformers. Such measurements shall be made by agreement between the manufacturer and the purchaser. Alternatively, measurements may be made on site where conditions are suitable.The methods are applicable to transformers and reactors covered by IEC Publications 76, 726 and 289, without further limitation as regards size or voltage and when fitted with their normal auxiliary equipment, inasmuch as it may influence the measurement result.Although the following text refers only to transformers, it is equally applicable to reactors provided that it is recognized that the current taken by a reactor is dependent on the voltage applied and, consequently, that a reactor cannot be tested at no-load.This standard provides a basis for calculation of sound power levels.The methods of measurement and the environmental qualification procedure given in Appendix A are in accordance with ISO Standard 3746. Measurements made in conformity with this IEC standard tend to result in standard deviations which are equal to or less than 3 dB.

    General Product Information - (Show below) - (Hide below)

    Committee EL-008
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes
    Under Revision

    History - (Show below) - (Hide below)

    Amendment 1 to AS 2374.6-1994 see DR 99486 CP First published as part of AS C61-1931.
    Second edition 1946 (endorsement of BS 171-1936 with amendments).
    Third edition 1963.
    Fourth edition 1970.
    Revised and redesignated in part as AS 2374.6-1982.
    Second edition 1994. First published as part of AS C61-1931. Second edition 1946 (endorsement of BS 171-1936 with amendments). Third edition 1963. Fourth edition 1970. Revised and redesignated in part as AS 2374.6-1982. Second edition 1994.

    Standards Referenced By This Book - (Show below) - (Hide below)

    AS 1259.1-1990 Acoustics - Sound level meters - Non-integrating
    AS 2374.1-1997 Power transformers General
    AS 4241-1994 Acoustics - Instruments for the measurement of sound intensity - Measurement with pairs of pressure sensing microphones
    AS 2735-1984 Dry-type power transformers
    AS 1028-1992 Power reactors and earthing transformers

    Standards Referencing This Book - (Show below) - (Hide below)

    AS 60146.1.1-2002 Semiconductor converters General requirements and line commutated converters - Specifications of basic requirements
    AS/NZS 2081.5:2002 Electrical equipment for coal and shale mines - Electrical protection devices - Earth-fault current limiters
    AS 60076.1-2005 Power transformers General (IEC 60076-1, Ed. 2.1 (2000) MOD)
    AS 2735-1984 Dry-type power transformers
    AS 2832.1-2004 Cathodic protection of metals - Pipes and cables
    AS 2067-2008 Substations and high voltage installations exceeding 1 kV a.c.
    AS 2374.1-1997 Power transformers General
    AS 61800.2-2004 Adjustable speed electrical power drive systems General requirements - Rating specifications for low voltage adjustable frequency a.c. power drive systems
    AS 2832.2-2003 Cathodic protection of metals Compact buried structures
    AS 61330-2005 High-voltage/low-voltage prefabricated substations
    AS 1028-1992 Power reactors and earthing transformers
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