Electromagnetic compatibility (EMC) - Part 3-11: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems - Equipment with rated current ≤ 75 A and subject to conditional connection

IEC 61000-3-11:2017 is also available as IEC 61000-3-11:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61000-3-11:2017 is concerned with the emission of voltage changes, voltage fluctuations and flicker produced by equipment and impressed on the public low-voltage supply system. It specifies the limits of voltage changes produced by equipment tested under specified conditions.
This edition includes the following significant technical changes with respect to the previous edition:
a) addition of a new Annex A which explains the limitations and effectiveness of IEC 61000‑3-11 regarding the connection of multiple items of similar equipment at the same location in the supply network.

Compatibilité électromagnétique (CEM) - Partie 3-11: Limites - Limitation des variations de tension, des fluctuations de tension et du papillotement dans les réseaux publics d'alimentation basse tension - Equipements ayant un courant assigné ≤ 75 A et soumis à un raccordement conditionnel

IEC 61000-3-11:2017 est disponible sous forme de IEC 61000-3-11:2017 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 61000-3-11:2017 traite des variations de tension, des fluctuations de tension et du papillotement (ou flicker) émis par des équipements et véhiculés par le réseau public d'alimentation basse tension. Elle spécifie les limites des variations de tension produites par des équipements soumis à l'essai dans des conditions déterminées.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) ajout d'une nouvelle Annexe A qui explicite les limites et l'efficacité de l'IEC 61000-3-11 concernant le raccordement de plusieurs équipements analogues au même emplacement dans le réseau d'alimentation.

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Status
Published
Publication Date
20-Apr-2017
Current Stage
PPUB - Publication issued
Start Date
21-Apr-2017
Completion Date
21-Apr-2017
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IEC 61000-3-11:2017 - Electromagnetic compatibility (EMC) - Part 3-11: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems - Equipment with rated current ≤ 75 A and subject to conditional connection
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IEC 61000-3-11
Edition 2.0 2017-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electromagnetic compatibility (EMC) –

Part 3-11: Limits – Limitation of voltage changes, voltage fluctuations and flicker

in public low-voltage supply systems – Equipment with rated current ≤75 A and
subject to conditional connection
Compatibilité électromagnétique (CEM) –
Partie 3-11: Limites – Limitation des variations de tension, des fluctuations de
tension et du papillotement dans les réseaux publics d’alimentation basse
tension – Équipements ayant un courant assigné ≤75 A et soumis à un
raccordement conditionnel
IEC 61000-3-11:2017-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61000-3-11
Edition 2.0 2017-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electromagnetic compatibility (EMC) –

Part 3-11: Limits – Limitation of voltage changes, voltage fluctuations and flicker

in public low-voltage supply systems – Equipment with rated current ≤75 A and
subject to conditional connection
Compatibilité électromagnétique (CEM) –
Partie 3-11: Limites – Limitation des variations de tension, des fluctuations de
tension et du papillotement dans les réseaux publics d’alimentation basse
tension – Équipements ayant un courant assigné ≤75 A et soumis à un
raccordement conditionnel
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10 ISBN 978-2-8322-4163-9

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61000-3-11:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 7

4 Requirements .................................................................................................................. 7

5 Limits .............................................................................................................................. 8

6 Test, measurement and evaluation procedures ................................................................ 9

6.1 Overview................................................................................................................. 9

6.2 Test and measurement procedures ......................................................................... 9

6.2.1 Test impedance Z ...................................................................................... 9

test

6.2.2 Test of equipment against Z ..................................................................... 10

test

6.2.3 Evaluation against Z .................................................................................. 10

ref
6.3 Evaluation and declaration by the manufacturer of the maximum permissible

system impedance ................................................................................................ 10

6.3.1 Comparison of calculated and measured emission values with Clause 5

limits to enable a declaration of compliance with IEC 61000-3-3 .................... 10

6.3.2 Calculation of the maximum permissible system impedance .......................... 10

6.4 Evaluation and declaration by the manufacturer of the minimum permissible

service current capacity ........................................................................................ 11

Annex A (informative) Explanation of flicker exponents ........................................................ 12

A.1 Overview............................................................................................................... 12

A.2 Explanation of Clause 6 ........................................................................................ 12

Annex B (informative) Flow chart showing the evaluation and test procedures leading

to the connection of equipment ............................................................................................. 17

Figure A.1 – Typical motor starting RMS voltage variation plot ............................................. 12

Figure A.2 – Visualization of the relationship between items of equipment “n” and P ......... 15

Figure A.3 – Impedance requirements as a function of individual P values and
st@Zref

penetration level n ................................................................................................................ 16

Figure B.1 – Flow chart showing the evaluation and test procedures leading to the

connection of equipment ....................................................................................................... 17

Figure B.2 – Reference network for single and three-phase supplies derived from a

three-phase, four-wire supply ................................................................................................ 18

Table 1 – Suffixes and their applications ................................................................................. 9

---------------------- Page: 4 ----------------------
IEC 61000-3-11:2017 © IEC 2017 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 3-11: Limits – Limitation of voltage changes, voltage fluctuations and
flicker in public low-voltage supply systems – Equipment with rated
current ≤75 A and subject to conditional connection
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

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.

International Standard IEC 61000-3-11 has been prepared by sub-committee 77A: EMC –

Low-frequency phenomena, of IEC technical committee 77: Electromagnetic compatibility.

This second edition cancels and replaces the first edition published in 2000. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) addition of a new Annex A which explains the limitations and effectiveness of

IEC 61000-3-11 regarding the connection of multiple items of similar equipment at the

same location in the supply network.
---------------------- Page: 5 ----------------------
– 4 – IEC 61000-3-11:2017 © IEC 2017
The text of this International Standard is based on the following documents:
CDV Report on voting
77A/929/CDV 77A/947/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61000, published under the general title Electromagnetic

compatibility (EMC), can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 6 ----------------------
IEC 61000-3-11:2017 © IEC 2017 – 5 –
INTRODUCTION
IEC 61000 is published in separate parts according to the following structure:
Part 1: General
General considerations (introduction, fundamental principles)
Definitions, terminology
Part 2: Environment
Description of the environment
Classification of the environment
Compatibility levels
Part 3: Limits
Emission limits

Immunity limits (in so far as they do not fall under the responsibility of product

committees)
Part 4: Testing and measurement techniques
Measurement techniques
Testing techniques
Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices
Part 9: Miscellaneous

Each part is further subdivided into several parts published either as International Standards

or technical reports, some of which have already been published as sections. Others will be

published with the part number followed by a dash and a second number identifying the

subdivision (example: 61000-3-11).
---------------------- Page: 7 ----------------------
– 6 – IEC 61000-3-11:2017 © IEC 2017
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 3-11: Limits – Limitation of voltage changes, voltage fluctuations and
flicker in public low-voltage supply systems – Equipment with rated
current ≤75 A and subject to conditional connection
1 Scope

This part of IEC 61000 is concerned with the emission of voltage changes, voltage

fluctuations and flicker produced by equipment and impressed on the public low-voltage

supply system.

It specifies the limits of voltage changes produced by equipment tested under specified

conditions.

This document is primarily applicable to electrical and electronic equipment having a rated

input current from 16 A up to and including 75 A, which is intended to be connected to public

low-voltage distribution systems having nominal system voltages of between 220 V and

250 V, line-to-neutral at 50 Hz, and which is subject to conditional connection.

This document is also applicable to equipment within the scope of IEC 61000-3-3 that does

not meet the limits when tested or evaluated with reference impedance Z and is therefore

ref

subject to conditional connection. Equipment which meets the requirements of IEC 61000-3-3

is excluded from this part of IEC 61000.
Equipment tests made in accordance with this document are type tests.

NOTE 1 The flicker limits specified in this document, being the same as those in IEC 61000-3-3, are based on the

subjective severity of the flicker imposed on the light from 230 V/60 W coiled-coil filament lamps when subjected to

fluctuations of the supply voltage. For systems with nominal voltages less than 220 V, line-to-neutral and/or

frequency of 60 Hz, the limits and reference circuit values are under consideration.

NOTE 2 The limits in this document relate to the voltage changes experienced by consumers connected at the

interface between the public supply low-voltage network and the equipment user’s installation. Therefore, it cannot

be guaranteed that the users of equipment compliant with this standard will not experience supply disturbance

within their own installation due to the operation of this equipment alone, as the impedance at the point of

connection of the equipment to the supply within the installation can have an impedance greater than the maximum

permissible impedance as determined by the procedures in this document.
2 Normative references

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.

IEC 60050-161, International Electrotechnical Vocabulary (IEV) – Chapter 161: Electro-

magnetic compatibility (available at www.electropedia.org)

IEC TR 60725, Consideration of reference impedances and public supply network impedances

for use in determining the disturbance characteristics of electrical equipment having a rated

current ≤75 A per phase

IEC 61000-3-3:2013, Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of

voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for

equipment with rated current ≤ 16 A per phase and not subject to conditional connection

---------------------- Page: 8 ----------------------
IEC 61000-3-11:2017 © IEC 2017 – 7 –
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-161,

IEC 61000-3-3 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
reference impedance
ref

conventional impedance specified in IEC 61000-3-3, with a value in accordance with

IEC TR 60725, and used in the calculation and measurement of relative voltage change d,

and of P and P values
st lt

Note 1 to entry: The resistive and reactive components of Z are given in Figure B.2.

ref
3.2
interface point
interface between a public supply network and a user’s installation
3.3
conditional connection

connection of equipment which requires the user’s supply at the interface point to have an

impedance lower than the reference impedance Z in order that the equipment emissions

ref
comply with the limits in this document

Note 1 to entry: Meeting the voltage change limits is not the only condition for connection; emission limits for

other phenomena such as harmonics, may also have to be satisfied.
3.4
service current capacity

current per phase which can be taken continuously by the user at the interface point without

exceeding the plant ratings used by the supply authority in the design of its system

Note 1 to entry: In practice the service current capacity is the rating of the main service fuse or overcurrent

protection setting of the circuit breaker at the interface point. In cases where supply authorities declare supply

capacities in volt-amperes (VA), the current per phase may be deduced for single-phase supplies by dividing the

volt-amperes by the declared phase voltage, and for three-phase supplies by dividing it by √3 times the declared

line voltage.
4 Requirements

The assessment of voltage changes and flicker shall be conducted in accordance with the

methods specified in IEC 61000-3-3.

If equipment with a rated current above 16 A complies with the requirements of IEC 61000-3-3

and therefore is not subject to conditional connection, it may be declared so by the

manufacturer in documentation made available to users before purchase.

Equipment which does not meet the limits of IEC 61000-3-3, when tested or evaluated with

reference impedance Z , is subject to conditional connection, and the manufacturer shall

ref
either:

a) determine the maximum permissible system impedance Z at the interface point of the

max

user’s supply in accordance with 6.3, declare Z in the equipment instruction manual

max
---------------------- Page: 9 ----------------------
– 8 – IEC 61000-3-11:2017 © IEC 2017

and instruct the user to determine in consultation with the supply authority, if necessary,

that the equipment is connected only to a supply of that impedance or less, or

b) test the equipment in accordance with 6.4 and declare in the equipment instruction

manual that the equipment is intended for use only in premises having a service current

capacity ≥ 100 A per phase, supplied from a distribution network having a nominal voltage

of 400/230 V, and instruct the user to determine in consultation with the supply authority,

if necessary, that the service current capacity at the interface point is sufficient for the

equipment.

The equipment shall be clearly marked as being suitable for use only in premises having a

service current capacity equal to or greater than 100 A per phase.

NOTE 1 In the case of option a), restrictions to connection can be imposed by the supply authority on the use of

equipment if the actual system impedance at the interface point on the user’s premises, Z , exceeds Z .

act max

NOTE 2 In the case of option b), a new symbol (IEC 60417-5855) is available for the purpose of marking

equipment.

NOTE 3 For options a) and b), if the supply capacity and/or the actual system impedance Z have been declared

act

to, or measured by, the user, this information can be used to assess the suitability of equipment without reference

to the supply authority.
5 Limits

The limits shall be applicable to voltage fluctuations and flicker at the supply terminals of the

equipment under test, measured or calculated according to Clause 4 under test conditions

described in Clause 6. Tests made to prove compliance with the limits are considered to be

type tests.
The following limits apply:

a) the value of the short-term flicker indicator, P shall not be greater than 1,0;

b) the value of the long-term flicker indicator, P shall not be greater than 0,65;

c) T , the accumulated time of d(t) with a deviation exceeding 3,3 % during a voltage

max
change, shall not exceed 500 ms;
d) the maximum relative steady-state voltage change, d , shall not exceed 3,3 %;
e) the maximum relative voltage change, d , shall not exceed:
max
1) 4 % without additional conditions;
2) 6 % for equipment which is
− switched manually, or

− switched automatically more than twice per day and having a delayed restart (the delay

being not less than a few tens of seconds), or manual restart after a power supply

interruption;

NOTE The cycling frequency will be further limited by the P and P limit. For example: a d of 6 %

max
st lt

producing a rectangular voltage change characteristic twice per hour will give a P of about 0,65.

3) 7 % for equipment which is

– attended whilst in use (for example, industrial machinery such as milling equipment

and lathes); or

– switched on automatically, or is intended to be switched on manually, no more than

twice per day and has a delayed restart (the delay being not less than a few tens of

seconds) or manual restart after a power supply interruption.

In the case of equipment incorporating multiple subsystems, limits 2) and 3) shall only apply if

there is delayed or manual restart after a power supply interruption; for all equipment with

automatic switching which is energised immediately on restoration of supply after a power

supply interruption, limits 1) shall apply; for all equipment with manual switching, limits 2) or

3) shall apply, depending on the rate of switching.
---------------------- Page: 10 ----------------------
IEC 61000-3-11:2017 © IEC 2017 – 9 –
P and P requirements shall not be applicable to voltage changes caused by manual
st lt
switching.

The limits shall not be applicable to emergency switching or emergency interruptions.

6 Test, measurement and evaluation procedures
6.1 Overview

Except where specified otherwise in this document, the general test conditions, measurement

and evaluation procedures specified in IEC 61000-3-3 shall apply. For equipment that meets

the conditions specified in 6.2.1 the test impedance in 6.2.1 shall be used.

An overview in the form of a flow chart showing the evaluation and test procedures used in

the assessment of equipment and leading to connection is given in Annex B (see Figure B.1).

In the calculations described in the following subclauses 6.2 to 6.4 the modulus values of

complex impedances shall be used.

In order to evaluate equipment and determine the maximum permissible system impedance

from a type test, some auxiliary quantities are necessary. These auxiliary quantities have

been given suffixes to facilitate their application in formulae and calculations; see Table 1.

The test conditions specified in IEC 61000-3-3:2013, Annex A, shall be applicable to

equipment rated ≤ 16 A. For equipment rated > 16 A the general test conditions specified in

IEC 61000-3-3 shall apply.
Table 1 – Suffixes and their applications
Suffix Representing Application

sys System Z is the modulus of the impedance of the system to which the equipment may

sys
be connected in order to meet a particular limit. A number after the subscript
identifies a particular calculation.
ref Reference Z is the reference impedance.
ref

act Actual Z is the modulus of the actual impedance of the supply existing at the interface

act
point.

max Maximum Z is the modulus of the maximum value of the supply impedance at which

max
equipment meets all the limits of this document.

test Test or measurement Z is the modulus of the test circuit impedance at which the emission test is

test
performed and d , d , P and P are measured values.
ctest max test st test lt test
6.2 Test and measurement procedures
6.2.1 Test impedance Z
test

The test impedance Z may be lower than Z , particularly for equipment having a rated

test ref
input current > 16 A
...

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