Doc: ET 40(6673)

BUREAU OF INDIAN STANDARDS DRAFT FOR COMMENTS ONLY

(Not to be reproduced without the permission of BIS or used as a STANDARD)

Draft Indian Standard

HIGH VOLTAGE DIRECT CURRENT (HVDC) SUBSTATION AUDIBLE NOISE

Last date for receipt of comments is: 14-11-2013.

HVDC Power systems Sectional Committee, ET 40 NATIONAL FOREWORD

This Indian Standard is identical with IEC 61973 (2012) ‘High voltage direct current (HVDC) substation audible noise’ issued by the International Electrotechnical Commission (IEC) is proposed to be adopted by the Bureau of Indian Standards on the recommendation of the HVDC Power Systems Sectional Committee and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards the current practice is to use a point (.) as the decimal marker.

In this adopted standard, references appear to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards, which are to be substituted in their respective places are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of

Equivalence

IEC 61672-1, Electroacoustics – Sound level meters – Part 1: Specifications

IS 15575(Part 1):2005 Electroacoustics - Sound level meters : Part 1 Specification

Identical to IEC 61672-

1(2002)

IEC 61672-2, Electroacoustics – Sound level meters – Part 2: Pattern evaluation tests

IS 15575(Part 2):2005 Electroacoustics - Sound level meters : Part 2 Pattern evaluation tests

Identical to IEC 61672-

2(2003)

The technical committee responsible for the preparation of this standard has reviewed the provisions of the following International Standards referred to in this adopted standard and has decided that they are acceptable for use in conjunction with this standard:

International Standard

Title

ISO 1996-2 Acoustics – Description, assessment and measurement of environmental noise – Part 2: Determination of environmental noise levels

ISO 266:1997 Acoustics – Preferred frequencies

ISO 3740 Acoustics – Determination of sound power levels of noise sources – Guidelines for the use of basic standards

ISO 3743-2 Acoustics – Determination of sound power levels of noise sources; engineering methods for small, movable sources in reverberant fields – Part 2: Methods for special reverberation test rooms

ISO 3744 Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Engineering methods for an essentially free field over a reflecting plane

ISO 3745 Acoustics – Determination of sound power levels of noise sources using sound pressure – Precision methods for anechoic and hemi-anechoic rooms

ISO 3746 Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Survey method using an enveloping measurement surface over a reflecting plane

ISO 8297 Acoustics – Determination of sound power levels of multisource industrial plants for evaluation of sound pressure levels in the environment – Engineering method

ISO 9613-1 Acoustics – Attenuation of sound during propagation outdoors – Part 1: Calculation of the absorption of sound by the atmosphere

ISO 9613-2 Acoustics – Attenuation of sound during propagation outdoors – Part 2: Genera method of calculation

ISO 9614-1 Acoustics – Determination of sound power levels of noise sources using sound intensity – Part 1: Measurement at discrete points

ISO 9614-2 Acoustics – Determination of sound power levels of noise sources using sound intensity – Part 2 : Measurement by scanning

Only the English text of the IEC Publication has been retained while adopting it is an Indian Standard and as such the page numbers given here are not same as in IEC Publications. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2:1960 ‘Rules for rounding of numerical values (revised)’. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. Note: The technical content of the documents is not available on website. For details, please refer the corresponding IEC 61973 (2012) or kindly contact: Head Electrotechnical Department Bureau of Indian Standards 9, B. S. Zafar Marg, New Delhi-110002 Email: eetd@bis.org.in Telephone/ fax: 011-23231192

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