SIST EN 61000-3-3:2009
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
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
This part of IEC is concerned with the limitation of voltage and flicker impressed on the public low-voltage system. It specifies limits of voltage changes which may be produced by an equipment tested under specified conditions and gives guidance on methods of assessment. This part of IEC 61000 is applicable to electrical and electronic equipment having an input current equal to or less than 16 A per phase, intended to be connected to public low-voltage distribution systems of between 220 V and 250 V line to neutral at 50 Hz, and not subject to conditional connection. Equipment which does not comply with the limits of this part of IEC 61000 when tested with the reference impedance Zref of 6.4, and which therefore cannot be declared compliant with this part, may be retested or evaluated to show conformity with IEC 61000-3-11. Part 3-11 is applicable to equipment with rated input current 75 A per phase and subject to conditional connection. The tests according to this part are type tests. Particular test conditions are given in annex A and the test circuit is shown in Figure 1.
Elektromagnetische Verträglichkeit (EMV) -- Teil 3-3: Grenzwerte - Begrenzung von Spannungsänderungen, Spannungsschwankungen und Flicker in öffentlichen Niederspannungs-Versorgungsnetzen für Geräte mit einem Bemessungsstrom <= 16 A je Leiter, die keiner Sonderanschlussbedingung unterliegen
Compatibilité électromagnétique (CEM) - Partie 3-3: Limites - Limitation des variations de tension, des fluctuations de tension et du papillotement dans les réseaux publics d'alimentation basse tension, pour les matériels ayant un courant assigné <= 16 A par phase et non soumis à un raccordement conditionnel
La CEI 61000-3-3:2008 traite des limitations des fluctuations de tension et du flicker appliqués sur le réseau de distribution public basse tension. Elle spécifie les limites des variations de tension pouvant être produites par un équipement essayé dans des conditions spécifiées et formule des recommandations pour les méthodes d'évaluation. La présente partie de la CEI 61000 s'applique aux matériels électriques et électroniques ayant un courant appelé inférieur ou égal à 16 A par phase et destinés à être raccordés à des réseaux publics de distribution basse tension présentant une tension nominale phase-neutre comprise entre 220 V et 250 V à 50 Hz et non soumis à un raccordement conditionnel. Les essais effectués selon la présente partie sont des essais de type. Les conditions d'essai pour des équipements particuliers sont données en Annexe A, et les circuits d'essai sont indiqués en Figure 1. Cette deuxième édition de la CEI 61000-3-3 annule et remplace la première édition parue en 1994, l'amendement 1 (2001) et l'amendement 2 (2005). Cette édition constitue une édition révisée. NEW! La CEI 61000-3-3:2008 est également disponible sous forme de IEC Standards+ 61000-3-3:2008 qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
Elektromagnetna združljivost (EMC) - 3-3. del: Mejne vrednosti - Omejitev vrednosti kolebanja napetosti in flikerja v nizkonapetostnih napajalnih sistemih za opremo z naznačenim tokom do 16 A in ni priključena pod posebnimi pogoji (IEC 61000-3-3:2008)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61000-3-3:2009
01-januar-2009
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SIST EN 61000-3-3:1997
(OHNWURPDJQHWQD]GUXåOMLYRVW (0& GHO 0HMQHYUHGQRVWL2PHMLWHY
YUHGQRVWLNROHEDQMDQDSHWRVWLLQIOLNHUMDYQL]NRQDSHWRVWQLKQDSDMDOQLKVLVWHPLK]D
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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
Elektromagnetische Verträglichkeit (EMV) -- Teil 3-3: Grenzwerte - Begrenzung von
Spannungsänderungen, Spannungsschwankungen und Flicker in öffentlichen
Niederspannungs-Versorgungsnetzen für Geräte mit einem Bemessungsstrom <= 16 A
je Leiter, die keiner Sonderanschlussbedingung unterliegen
Compatibilité électromagnétique (CEM) - Partie 3-3: Limites - Limitation des variations de
tension, des fluctuations de tension et du papillotement dans les réseaux publics
d'alimentation basse tension, pour les matériels ayant un courant assigné <= 16 A par
phase et non soumis à un raccordement conditionnel
Ta slovenski standard je istoveten z: EN 61000-3-3:2008
ICS:
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
SIST EN 61000-3-3:2009 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61000-3-3:2009
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SIST EN 61000-3-3:2009
EUROPEAN STANDARD
EN 61000-3-3
NORME EUROPÉENNE
September 2008
EUROPÄISCHE NORM
ICS 33.100.10 Supersedes EN 61000-3-3:1995 + A1:2001 + IS1:2005 + A2:2005
English version
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
(IEC 61000-3-3:2008)
Compatibilité électromagnétique (CEM) - Elektromagnetische Verträglichkeit (EMV) -
Partie 3-3: Limites - Teil 3-3: Grenzwerte -
Limitation des variations de tension, Begrenzung von Spannungsänderungen,
des fluctuations de tension Spannungsschwankungen und Flicker
et du papillotement dans les réseaux in öffentlichen Niederspannungs-
publics d'alimentation basse tension, Versorgungsnetzen für Geräte
pour les matériels ayant un courant mit einem Bemessungsstrom ≤ 16 A
assigné ≤ 16 A par phase et non soumis je Leiter, die keiner
à un raccordement conditionnel Sonderanschlussbedingung unterliegen
(CEI 61000-3-3:2008) (IEC 61000-3-3:2008)
This European Standard was approved by CENELEC on 2008-09-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61000-3-3:2008 E
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SIST EN 61000-3-3:2009
EN 61000-3-3:2008 - 2 -
Foreword
The text of document 77A/644/FDIS, future edition 2 of IEC 61000-3-3, prepared by SC 77A, Low
frequency phenomena, of IEC TC 77, Electromagnetic compatibility, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as EN 61000-3-3 on 2008-09-01.
This European Standard supersedes EN 1000-3-3:1995 + corrigendum July 1997 + A1:2001 + IS1:2005
+ A2:2005.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-09-01
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directives 2004/108/EC and 1999/5/EC. See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61000-3-3:2008 was approved by CENELEC as a European
Standard without any modification.
__________
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SIST EN 61000-3-3:2009
- 3 - EN 61000-3-3:2008
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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 When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60050-161 1990 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 161: Electromagnetic compatibility
1)
IEC/TR 60725 - Consideration of reference impedances and - -
public supply network impedances for use in
determining disturbance characteristics of
electrical equipment having a rated current
≤ 75 A per phase
1) 2)
IEC 60974-1 - Arc welding equipment - EN 60974-1 2005
Part 1: Welding power sources
IEC 61000-3-2 2005 Electromagnetic compatibility (EMC) - EN 61000-3-2 2006
Part 3-2: Limits - Limits for harmonic current
emissions (equipment input current ≤ 16 A per
phase)
1) 2)
IEC 61000-3-11 - Electromagnetic compatibility (EMC) - EN 61000-3-11 2000
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) 2)
IEC 61000-4-15 - Electromagnetic compatibility (EMC) - EN 61000-4-15 1998
Part 4-15: Testing and measurement
techniques - Flickermeter - Functional and
design specifications
1)
Undated reference.
2)
Valid edition at date of issue.
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SIST EN 61000-3-3:2009
EN 61000-3-3:2008 - 4 -
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers the
essential requirements as given in Annex I Article 1(a) of the EC Directive 2004/108/EC and the essential
requirements of Article 3.1(b) (emission only) of the EC Directive 1999/5/EC.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directives concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
___________
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SIST EN 61000-3-3:2009
IEC 61000-3-3
Edition 2.0 2008-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
Compatibilité électromagnétique (CEM) –
Partie 3-3: Limites – Limitation des variations de tension, des fluctuations de
tension et du papillotement dans les réseaux publics d'alimentation basse
tension, pour les matériels ayant un courant assigné ≤16 A par phase et non
soumis à un raccordement conditionnel
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
T
CODE PRIX
ICS 33.100.10 ISBN 2-8318-9831-5
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SIST EN 61000-3-3:2009
– 2 – 61000-3-3 © IEC:2008
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references.6
3 Definitions.7
4 Assessment of voltage changes, voltage fluctuations and flicker .8
4.1 Assessment of a relative voltage change, "d" .8
4.2 Assessment of the short-term flicker value, P .9
st
4.2.1 Flickermeter.9
4.2.2 Simulation method.9
4.2.3 Analytical method.9
4.2.4 Use of P = 1 curve.10
st
4.3 Assessment of long-term flicker value, P .10
lt
5 Limits.10
6 Test conditions.11
6.1 General.11
6.2 Measurement accuracy.12
6.3 Test supply voltage.12
6.4 Reference impedance.12
6.5 Observation period.12
6.6 General test conditions.13
Annex A (normative) Application of limits and type test conditions
for specific equipment.18
Annex B (normative) Test conditions and procedures for measuring d voltage
max
changes caused by manual switching .25
Figure 1 – Reference network for single-phase and three-phase supplies derived
from a three-phase, four-wire supply.14
15
Figure 2 – Histogram evaluation of U(t).
Figure 3 – Relative voltage change characteristic .15
Figure 4 – Curve for P =1 for rectangular equidistant voltage changes .16
st
Figure 5 – Shape factors F for double-step and ramp-voltage characteristics.16
Figure 6 – Shape factors F for rectangular and triangular voltage characteristics.17
Figure 7 – Shape factor F for motor-start voltage characteristics
having various front times .17
Table 1 – Assessment method .9
Table A.1 – Electrode parameters.23
Table A.2 – Frequency factor R related to repetition rate "r" .24
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SIST EN 61000-3-3:2009
61000-3-3 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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
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.
International Standard IEC 61000-3-3 has been prepared by subcommittee 77A: Low-
frequency phenomena, of IEC technical committee 77: Electromagnetic compatibility.
This second edition IEC 61000-3-3 cancels and replaces the first edition published in 1994,
amendment 1 (2001) and amendment 2 (2005). This edition constitutes a revised edition.
The document 77A/644/FDIS, circulated to the National Committees as amendment 3, led to
the publication of the new edition.
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SIST EN 61000-3-3:2009
– 4 – 61000-3-3 © IEC:2008
The text of this standard is based on the first edition, its amendment 1, amendment 2 and on
the following documents:
FDIS Report on voting
77A/644/FDIS 77A/650/RVD
Full information on the voting for the approval of this standard 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.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN 61000-3-3:2009
61000-3-3 © IEC:2008 – 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 sections which are to be published either as International
Standards or as Technical Reports.
These standards and reports will be published in chronological order and numbered
accordingly.
This part is a Product Family Standard.
The limits in this standard 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. Consequently, if the actual impedance of the supply at the supply terminals of
equipment connected within the equipment user’s installation exceeds the test impedance,
it is possible that supply disturbance exceeding the limits may occur.
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SIST EN 61000-3-3:2009
– 6 – 61000-3-3 © IEC:2008
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
1 Scope
This part of IEC 61000 is concerned with the limitation of voltage fluctuations and flicker
impressed on the public low-voltage system.
It specifies limits of voltage changes which may be produced by an equipment tested under
specified conditions and gives guidance on methods of assessment.
This part of IEC 61000 is applicable to electrical and electronic equipment having an input
current equal to or less than 16 A per phase, intended to be connected to public low-voltage
distribution systems of between 220 V and 250 V line to neutral at 50 Hz, and not subject to
conditional connection.
Equipment which does not comply with the limits of this part of IEC 61000 when tested with
the reference impedance Z of 6.4, and which therefore cannot be declared compliant with
ref
this part, may be retested or evaluated to show conformity with IEC 61000-3-11. Part 3-11 is
applicable to equipment with rated input current ≤75 A per phase and subject to conditional
connection.
The tests according to this part are type tests. Particular test conditions are given in annex A
and the test circuit is shown in Figure 1.
NOTE The limits in this part of IEC 61000 are based mainly on the subjective severity of flicker imposed on the
light from 230 V/60 W coiled-coil filament lamps by fluctuations of the supply voltage. For systems with nominal
voltage less than 220 V line to neutral and/or frequency of 60 Hz, the limits and reference circuit values are under
consideration.
2 Normative references
The following referenced documents are indispensable for the application 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):1990, International Electrotechnical Vocabulary (IEV) – Chapter 161:
Electromagnetic compatibility
IEC/TR 60725, Consideration of reference impedances and public supply impedances for use
in determining disturbance characteristics of electrical equipment having a rated current
≤75 A per phase
IEC 60974-1, Arc welding equipment – Part 1: Welding power sources
IEC 61000-3-2:2005, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for
harmonic current emissions (equipment input current ≤16 A per phase)
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SIST EN 61000-3-3:2009
61000-3-3 © IEC:2008 – 7 –
IEC 61000-3-11, 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 61000-4-15, Electromagnetic compatibility (EMC) – Part 4: Testing and measurement
techniques – Section 15: Flickermeter – Functional and design specifications
3 Definitions
For the purpose of this part of IEC 61000-3, the following definitions apply.
3.1
r.m.s. voltage shape, U(t)
the time function of r.m.s. voltage, evaluated as a single value for each successive half period
between zero-crossings of the source voltage (see Figure 2)
3.2
voltage change characteristic, ΔU(t)
the time function of the r.m.s. voltage change evaluated as a single value for each successive
half period between zero-crossings of the source voltage between time intervals in which the
voltage is in a steady-state condition for at least 1 s (see Figure 2)
NOTE Since this characteristic is only used for assessments using calculations, the voltage in the steady-state
condition is assumed to be constant within the measurement accuracy (see 6.2).
3.3
maximum voltage change characteristic, ΔU
max
the difference between maximum and minimum r.m.s. values of a voltage change
characteristic (see Figure 2)
3.4
steady-state voltage change, ΔU
c
the difference between two adjacent steady-state voltages separated by at least one voltage
change characteristic (see Figure 2)
NOTE Definitions 3.2 to 3.4 relate to absolute phase-to-neutral voltages. The ratios of these magnitudes to the
phase-to-neutral value of the nominal voltage (U ) of the reference network in Figure 1 are called:
n
– relative voltage change characteristic: d(t) (definition 3.2);
– maximum relative voltage change: d (definition 3.3);
max
– relative steady-state voltage change: d (definition 3.4).
c
These definitions are explained by the example in Figure 3.
3.5
voltage fluctuation
series of changes of r.m.s. voltage evaluated as a single value for each successive half-
period between zero-crossings of the source voltage
3.6
flicker
impression of unsteadiness of visual sensation induced by a light stimulus whose luminance
or spectral distribution fluctuates with time. [IEV 161-08-13]
3.7
short-term flicker indicator, P
st
the flicker severity evaluated over a short period (in minutes); P = 1 is the conventional
st
threshold of irritability
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SIST EN 61000-3-3:2009
– 8 – 61000-3-3 © IEC:2008
3.8
long-term flicker indicator, P
lt
the flicker severity evaluated over a long period (a few hours) using successive P values
st
3.9
flickermeter:
an instrument designed to measure any quantity representative of flicker
NOTE Measurements are normally P and P . [IEV 161-08-14]
st lt
3.10
flicker impression time, t
f
value with a time dimension which describes the flicker impression of a voltage change
characteristic
3.11
conditional connection
connection of equipment requiring 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 part.
NOTE Meeting the voltage change limits may not be the only condition for connection; emission limits for other
phenomena such as harmonics, may also have to be satisfied.
3.12
interface point
interface between a public supply network and a user’s installation
4 Assessment of voltage changes, voltage fluctuations and flicker
4.1 Assessment of a relative voltage change, "d"
The basis for flicker evaluation is the voltage change characteristic at the terminals of
the equipment under test, that is the difference ΔU of any two successive values of the phase-
to-neutral voltages U(t ) and U(t ):
1 2
ΔU = U(t ) – U(t) (1)
1 2
The r.m.s. values U(t ), U(t ) of the voltage shall be measured or calculated. When deducing
1 2
r.m.s. values from oscillographic waveform, account should be taken of any waveform
distortion that may be present. The voltage change ΔU is due to the change of the voltage
drop across the complex reference impedance Z, caused by the complex fundamental input
current change, ΔI, of the equipment under test. ΔI and ΔI are the active and reactive parts
p q
respectively of the current change, ΔI.
ΔI = ΔI – j · ΔI = I(t ) – I(t) (2)
p q 1 2
NOTE 1 I is positive for lagging currents and negative for leading currents.
q
NOTE 2 If the harmonic distortion of the currents I(t ) and I(t ) is less than 10 %, the total r.m.s. value may be
1 2
applied instead of the r.m.s. values of their fundamental currents.
NOTE 3 For single-phase and symmetrical three-phase equipment the voltage change can, provided X is positive
(inductive), be approximated to:
ΔU = ⏐ΔI · R + ΔI · X ⏐ (3)
p q
where
ΔI and ΔI are the active and reactive parts respectively of the current change ΔI;
p q
R and X are the elements of the complex reference impedance Z (see Figure 1).
The relative voltage change is given by:
"d" = ΔU/U (4)
n
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SIST EN 61000-3-3:2009
61000-3-3 © IEC:2008 – 9 –
4.2 Assessment of the short-term flicker value, P
st
The short-term flicker value P is defined in IEC 61000-4-15.
st
Table 1 shows alternative methods for evaluating P , due to voltage fluctuations of different
st
types:
Table 1 – Assessment method
Types of voltage fluctuations Methods of evaluation P
st
All voltage fluctuations
Direct measurement
(on-line evaluation)
All voltage fluctuations where U(t) is defined Simulation
Direct measurement
Voltage change characteristics according Analytical method
to Figures 5 to 7 with an occurrence rate Simulation
less than 1 per second Direct measurement
Rectangular voltage change at equal intervals Use of the P = 1 curve of Figure 4
st
4.2.1 Flickermeter
All types of voltage fluctuations may be assessed by direct measurement using a flickermeter
which complies with the specification given in IEC 61000-4-15, and is connected as described
in Clause 6 of this part. This is the reference method for application of the limits.
4.2.2 Simulation method
In the case where the relative voltage change characteristic d(t) is known, P can be
st
evaluated using a computer simulation.
4.2.3 Analytical method
value can
For voltage change characteristics of the types shown in Figures 5, 6 and 7, the P
st
be evaluated by an analytical method using equations (5) and (6).
NOTE 1 The value of P obtained using this method is expected to be within ±10 % of the result which would be
st
obtained by direct measurement (reference method).
NOTE 2 This method is not recommended if the time duration between the end of one voltage change and the
start of the next is less than 1 s.
4.2.3.1 Description of the analytical method
Each relative voltage change characteristic shall be expressed by a flicker impression time, t ,
f
in seconds:
3,2
t = 2,3 (F · d ) (5)
f max
– the maximum relative voltage change d is expressed as a percentage
...
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