CLC/TS 61400-14:2017

Wind turbines - Part 14: Declaration of apparent sound power level and tonality values

Gives guidelines for declaring the apparent sound power level and tonality of a batch of wind turbines. Is to be used in conjunction with IEC 61400-11 which gives measurement procedures for apparent sound power level and tonality. This publication is of high relevance for Smart Grid.

Windenergieanlagen - Teil 14: Angabe von immissionsrelevanten Schallleistungspegel- und Tonhaltigkeitswerten

Éoliennes - Partie 14: Déclaration des valeurs du niveau de puissance acoustique apparent et de la tonalité

Vetrne turbine - 14. del: Izjava o nivoju navidezne moči zvoka in vrednostih tonalitete (IEC/TS 61400-14:2005)

Ta del standarda IEC 61400 daje smernice za razglasitev navidezne ravni zvočne moči in tonalitete serije vetrnih turbin. Postopki merjenja za navidezno raven zvočne moči in tonalitete so opredeljeni v standardu IEC 61400-11.

General Information

• Status: Published
• Publication Date: 31-Aug-2017
• ICS: 27.180 - Wind turbine energy systems
• Technical Committee: CLC/TC 88 - Wind turbines
• Drafting Committee: CLC/TC 88 - Wind turbines
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 01-Sep-2017
• Due Date: 05-Nov-2018
• Completion Date: 01-Sep-2017
• Ref Project: SIST-TS CLC/TS 61400-14:2017 - Wind turbines - Part 14: Declaration of apparent sound power level and tonality values (IEC/TS 61400-14:2005)

Overview

CLC/TS 61400-14:2017 (IEC/TS 61400‑14:2005) gives guidelines for declaring the apparent sound power level and tonality of a batch of wind turbines. It is intended to be used together with IEC 61400‑11 (acoustic measurement procedures) and provides a reproducible statistical approach so manufacturers, planners and authorities can state noise emission values for a turbine type rather than a single machine. The Technical Specification is relevant to wind farm planning, permitting and Smart Grid integration where acoustic performance influences siting and community acceptance.

Key topics and technical requirements

• Batch declaration: A batch is wind turbines of the same make, model and specifications. The TS defines how to derive a declared noise value for a batch from measurements on several turbines.
• Measurement basis: Uses apparent sound power level and tonality measured according to IEC 61400‑11. All individual measurement reports must be annexed to the declaration.
• Statistical treatment:
  • A mean apparent sound power level Lw and sample standard deviation s are calculated from n measurements (typically a minimum of three).
  • The standard deviations of production (σP) and reproducibility (σR) are used to compute the total standard deviation σ.
  • An example estimate for reproducibility is σR = 0.9 dB (from IEC 61400‑11 guidance).
  • The declared apparent sound power level Ld is given by Ld = Lw + K, where K = 1.645·σ (K corresponds to a 95 % confidence level that turbines will not exceed the declared value).
• Tonality: Tonality is reported per turbine (values and frequency/ies). The specification notes limited statistical data for tonality so it is not declared using the same statistical formula as sound power level.
• Additional provisions: Methods to convert sound power to a different hub height (Annex A) and discussion of turbine/site influences on acoustics (Annex B).

Applications and users

• Wind turbine manufacturers - to produce certified, batch-level noise declarations for product datasheets and procurement.
• Wind farm developers and planners - to assess cumulative noise impact and compare turbine models during site selection.
• Regulators and permitting authorities - to verify declared noise limits and enforce community noise criteria.
• Acoustic consultants and certification bodies - to perform compliant measurements, statistical analysis and verification.
• Smart Grid planners - to include acoustic constraints in distributed generation planning where siting, community acceptance and integrated system operation are concerned.

Related standards

• IEC 61400‑11 - Acoustic noise measurement techniques (measurement procedures used by this TS).
• ISO 4871 - Declaration and verification of noise emission values.
• ISO 7574 - Statistical methods for determining and verifying stated noise emission values.
• CLC/TS 61400‑14:2017 is the CENELEC adoption of IEC/TS 61400‑14.

Keywords: wind turbine noise, apparent sound power level, tonality, IEC 61400‑11, noise declaration, batch declaration, CLC/TS 61400‑14, Smart Grid.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2017
9HWUQHWXUELQHGHO,]MDYDRQLYRMXQDYLGH]QHPRþL]YRNDLQYUHGQRVWLK
WRQDOLWHWH,(&76
Wind turbines - Part 14: Declaration of apparent sound power level and tonality values
(IEC/TS 61400-14:2005)
Windenergieanlagen - Teil 14: Angabe der immissionsrelevanten Schallleistungspegel
und der Tonhaltigkeit (IEC/TS 61400-14:2005)
Éoliennes - Partie 14: Déclaration des valeurs du niveau de puissance acoustique
apparent et de la tonalité (IEC/TS 61400-14:2005)
Ta slovenski standard je istoveten z: CLC/TS 61400-14:2017
ICS:
27.180 Vetrne elektrarne Wind turbine energy systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION CLC/TS 61400-14

SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
September 2017
ICS 27.180
English Version
Wind turbines -
Part 14: Declaration of apparent sound power level
and tonality values
(IEC/TS 61400-14:2005)
Éoliennes -  Windenergieanlagen -
Partie 14: Déclaration des valeurs du niveau Teil 14: Angabe von immissionsrelevanten
de puissance acoustique apparent et de la tonalité Schallleistungspegel- und Tonhaltigkeitswerten
(IEC/TS 61400-14:2005) (IEC/TS 61400-14:2005)
This Technical Specification was approved by CENELEC on 2017-07-17.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TS 61400-14:2017 E

European foreword
This document (CLC/TS 61400-14:2017) consists of the text of IEC/TS 61400-14:2005 prepared by
IEC/TC 88 "Wind energy generation systems".
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC/TS 61400-14:2005 was approved by CENELEC as a
Technical Specification without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.

Publication Year Title EN/HD Year
1)
EN 61400-11 2003
IEC 61400-11 2002 Wind turbine generator systems -
Part 11: Acoustic noise measurement
techniques
ISO 4871 1996 Acoustics - Declaration and verification EN ISO 4871 2009
of noise emission values of machinery
and equipment
ISO 7574 series Acoustics - Statistical methods for EN 27574 series
determining and verifying stated noise
emission values of machinery and
equipment
1) EN 61400-11:2003 is superseded by EN 61400-11:2013, which is based on IEC 61400-11:2012.
TECHNICAL IEC
SPECIFICATION TS 61400-14
First edition
2005-03
Wind turbines –
Part 14:
Declaration of apparent sound
power level and tonality values

 IEC 2005  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
L
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – TS 61400-14  IEC:2005(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5

1 Scope .6
2 Normative references .6
3 Terms and definitions .6
4 General .7
5 Declaration.7
5.1 Declaration of apparent sound power level for a wind turbine.7
5.2 Declaration of tonality .8
6 Information to be reported.8

Annex A (informative) Method of calculating apparent sound power level to another
hub height .9
Annex B (informative) Influence of turbine and site characteristics on the acoustical
performance .11

TS 61400-14  IEC:2005(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WIND TURBINES –
Part 14: Declaration of apparent sound power level
and tonality values
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 61400-14, which is a technical specification, has been prepared by IEC technical
committee 88: Wind turbines.
– 4 – TS 61400-14  IEC:2005(E)
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
88/193/DTS 88/222/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.
IEC 61400 consists of the following parts, under the general title Wind turbines:
Part 1: Design requirements
Part 2: Safety of small wind turbines
Part 11: Acoustic noise measurement techniques
Part 12: Wind turbine power performance testing
Part 13: Measurement of mechanical loads
Part 14: Declaration of apparent sound power level and tonality values
Part 21: Measurement and assessment of power quality characteri
...