SIST EN 61000-4-30:2003
(Main)Electromagnetic compatibility (EMC) -- Part 4-30: Testing and measurement techniques - Power quality measurement methods
Electromagnetic compatibility (EMC) -- Part 4-30: Testing and measurement techniques - Power quality measurement methods
Defines the methods for measurement and interpretation of results for power quality parameters in 50/60 Hz a.c. power supply systems. The power quality parameters considered in this standard are power frequency, magnitude of the supply voltage, flicker, supply voltage dips and swells, voltage interruptions, transient voltages, supply voltage unbalance, voltage and current harmonics and interharmonics, mains signalling on the supply voltage and rapid voltage changes. Depending on the purpose of the measurement, all or a subset of the phenomena on this list may be measured. This standard is a performance specification, not a design specification. The uncertainty tests in the ranges of influence quantities in this standard determine the performance requirements. This standard gives measurement methods but does not set thresholds.
Elektromagnetische Verträglichkeit (EMV) -- Teil 4-30: Prüf- und Messverfahren - Verfahren zur Messung der Spannungsqualität
Compatibilité électromagnétique (CEM) -- Partie 4-30: Techniques d'essai et de mesure - Méthodes de mesure de la qualité de l'alimentation
Définit les méthodes de mesure des paramètres de qualité de l'alimentation des réseaux à courant alternatif 50/60 Hz et la façon d'interpréter les résultats. Les paramètres de qualité de l'alimentation pris en compte dans le présent document sont la fréquence, l'amplitude de la tension d'alimentation, le papillotement ("flicker"), les creux et les surtensions temporaires d'alimentation, les coupures de tension, les tensions transitoires, le déséquilibre de tension d'alimentation, les harmoniques et interharmoniques de tension et de courant, les signaux transmis sur la tension d'alimentation et les variations rapides de tension. En fonction de l'objet de la mesure, les mesures peuvent porter soit sur une partie des phénomènes de cette liste, soit sur l'ensemble. La présente norme définit des méthodes de mesure mais ne constitue pas une spécification de réalisation. Les essais de précision dans le domaine de variation des grandeurs d'influence de la présente norme sont utilisés comme exigence fonctionnelle. La présente norme indique des méthodes de mesure sans fixer de seuils.
Electromagnetic compatibility (EMC) - Part 4-30: Testing and measurement techniques - Power quality measurement methods (IEC 61000-4-30:2003)
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SIST EN 61000-4-30:2003SLOVENSKIdecember 2003
STANDARDElectromagnetic compatibility (EMC) - Part 4-30: Testing and measurement techniques - Power quality measurement methods (IEC 61000-4-30:2003)©
Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljenoReferenčna številkaSIST EN 61000-4-30:2003(en)ICS33.100.01
EUROPEAN STANDARD
EN 61000-4-30 NORME EUROPÉENNE EUROPÄISCHE NORM
April 2003 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
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61000-4-30:2003 E
ICS 33.100.99
English version
Electromagnetic compatibility (EMC) Part 4-30: Testing and measurement techniques –
Power quality measurement methods (IEC 61000-4-30:2003)
Compatibilité électromagnétique (CEM) Partie 4-30: Techniques d'essai
et de mesure –
Méthodes de mesure de la qualité
de l'alimentation (CEI 61000-4-30:2003)
Elektromagnetische Verträglichkeit (EMV)Teil 4-30: Prüf- und Messverfahren - Verfahren zur Messung
der Spannungsqualität (IEC 61000-4-30:2003)
This European Standard was approved by CENELEC on 2003-04-01. 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.
EN 61000-4-30:2003 - 2 - Foreword The text of document 77A/398/FDIS, future edition 1 of IEC 61000-4-30, 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 61000-4-30 on 2003-04-01. 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) 2004-01-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow) 2006-04-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annex A is informative. Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 61000-4-30:2003 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60044-1 NOTE Harmonized as EN 60044-1:1999 (modified).
IEC 60044-2 NOTE Harmonized as EN 60044-2:1999 (modified).
IEC 61000-2-2 NOTE Harmonized as EN 61000-2-2:2002 (not modified).
IEC 61010 NOTE Harmonized in EN 61010 series (partly modified).
IEC 61010-2-032 NOTE Harmonized as EN 61010-2-032:2002 (not modified). __________
- 3 - EN 61000-4-30:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). 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 - 1) International Electrotechnical Vocabulary (IEV) Chapter 161: Electromagnetic compatibility
- - IEC 60050-300 - 1) Part 311: General terms relating to measurements –
Part 312: General terms relating to electrical measurements -- µ Part 313: Types of electrical measuring instruments –
Part 314: Specific terms according to the type of instrument
- - IEC 61000-2-4 - 1) Electromagnetic compatibility (EMC) Part 2-4: Environment - Compatibility levels in industrial plants for low-frequency conducted disturbances
EN 61000-2-4 2002 2) IEC 61000-3-8 - 1) Part 3-8: Limits - Signalling on low-voltage electrical installations - Emission levels, frequency bands and electromagnetic disturbance levels
- - IEC 61000-4-7 2002 Part 4-7: Testing and measurement techniques - General guide on harmonics and interharmonics measurements and instrumentation, for power supply systems and equipment connected thereto
EN 61000-4-7 2002 IEC 61000-4-15 - 1) Part 4-15: Testing and measurement techniques - Flickermeter - Functional and design specifications
EN 61000-4-15 1998 2)
1) Undated reference. 2) Valid edition at date of issue.
EN 61000-4-30:2003 - 4 - Publication Year Title EN/HD Year IEC 61180 Series High-voltage test techniques for low-voltage equipment
EN 61180 Series
NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD61000-4-30Première éditionFirst edition2003-02Compatibilité électromagnétique (CEM) –Partie 4-30:Techniques d'essai et de mesure –Méthodes de mesure de la qualitéde l'alimentationElectromagnetic compatibility (EMC) –Part 4-30:Testing and measurement techniques –Power quality measurement methodsPour prix, voir catalogue en vigueurFor price, see current catalogue IEC 2003
Droits de reproduction réservés
Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucun procédé,électronique ou mécanique, y compris la photo-copie et lesmicrofilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized in anyform or by any means, electronic or mechanical, includingphotocopying and microfilm, without permission in writing fromthe publisher.International Electrotechnical Commission,
3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11
Telefax: +41 22 919 03 00
E-mail: inmail@iec.ch
Web: www.iec.chCommission Electrotechnique InternationaleInternational Electrotechnical Commission
XCODE PRIXPRICE CODEPUBLICATION FONDAMENTALE EN CEMBASIC EMC PUBLICATION
61000-4-30 © IEC:2003– 3 –CONTENTSFOREWORD.5INTRODUCTION.71Scope.92Normative references.93Definitions.114General.194.1Classes of measurement performance.194.2Organization of the measurements.194.3Electrical values to be measured.194.4Measurement aggregation over time intervals.214.5Measurement aggregation algorithm.214.6Time-clock uncertainty.234.7Flagging concept.235Power quality parameters.255.1Power frequency.255.2Magnitude of the supply voltage.255.3Flicker.275.4Supply voltage dips and swells.295.5Voltage interruptions.335.6Transient voltages.355.7Supply voltage unbalance.355.8Voltage harmonics.375.9Voltage interharmonics.375.10Mains signalling voltage on the supply voltage.395.11Rapid voltage changes.395.12Measurement of underdeviation and overdeviation parameters.396Range of influence quantities and implementation verification.416.1Range of influence quantities.416.2Implementation verification.43Annex A (informative)
Power quality measurements – Issues and guidelines.47A.1Installation precautions.47A.2Transducers.53A.3Transient voltages and currents.59A.4Rapid voltage changes.65A.5Current.65A.6Guidelines for contractual applications of power quality measurements.71A.7Trouble-shooting applications.79A.8Statistical survey applications.81A.9Voltage dip characteristics.83Bibliography.89
61000-4-30 © IEC:2003 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 4-30: Testing and measurement techniques – Power quality measurement methods
FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees. 3) The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any instrument declared to be in conformity with one of its standards. 6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61000-4-30 has been prepared by subcommittee 77A: Low- frequency phenomena, of IEC technical committee 77: Electromagnetic compatibility. This standard forms part 4-30 of IEC 61000. It has the status of a basic EMC publication in accordance with IEC Guide 107. The text of this standard is based on the following documents: FDIS Report on voting 77A/398/FDIS 77A/402/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 publication will remain unchanged until 2005. At this date, the publication will be
• reconfirmed; • withdrawn; • replaced by a revised edition, or • amended. The contents of the corrigendum of August 2006 have been included in this copy.
61000-4-30 © IEC:2003– 7 –INTRODUCTIONIEC 61000 is published in separate parts according to the following structure:Part 1: GeneralGeneral considerations (introduction, fundamental principles)Definitions, terminologyPart 2: EnvironmentDescription of the environmentClassification of the environmentCompatibility levelsPart 3: LimitsEmission limitsImmunity limits (in so far as they do not fall under the responsibility of the productcommittees)Part 4: Testing and measurement techniquesMeasurement techniquesTesting techniquesPart 5: Installation and mitigation guidelinesInstallation guidelinesMitigation methods and devicesPart 6: Generic standardsPart 9: MiscellaneousEach part is further subdivided into several parts, published either as International Standardsor as Technical Specifications or Technical Reports, some of which have already beenpublished as sections. Others will be published with the part number followed by a dash andcompleted by a second number identifying the subdivision (example: 61000-6-1).
61000-4-30 © IEC:2003– 9 –ELECTROMAGNETIC COMPATIBILITY (EMC) –Part 4-30: Testing and measurement techniques –Power quality measurement methods1 ScopeThis part of IEC 61000-4 defines the methods for measurement and interpretation of results forpower quality parameters in 50/60 Hz a.c. power supply systems.Measurement methods are described for each relevant type of parameter in terms that willmake it possible to obtain reliable, repeatable and comparable results regardless of thecompliant instrument being used and regardless of its environmental conditions. This standardaddresses measurement methods for in situ measurements.Measurement of parameters covered by this standard is limited to those phenomena that canbe conducted in a power system. These include the voltage and/or current parameters, asappropriate.The power quality parameters considered in this standard are power frequency, magnitude ofthe supply voltage, flicker, supply voltage dips and swells, voltage interruptions, transientvoltages, supply voltage unbalance, voltage and current harmonics and interharmonics, mainssignalling on the supply voltage and rapid voltage changes. Depending on the purpose of themeasurement, all or a subset of the phenomena on this list may be measured.This standard is a performance specification, not a design specification. The uncertainty testsin the ranges of influence quantities in this standard determine the performance requirements.This standard gives measurement methods but does not set thresholds.The effects of transducers being inserted between the power system and the instrument areacknowledged but not addressed in detail in this standard. Precautions on installing monitorson live circuits are addressed.2 Normative referencesThe following referenced documents are indispensable for the application of this document. Fordated references, only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.IEC 60050(161), International Electrotechnical Vocabulary (IEV) – Chapter 161: Electro-magnetic compatibility
61000-4-30 © IEC:2003– 11 –IEC 60050-300, International Electrotechnical Vocabulary (IEV) – Electrical and electronicmeasurements and measuring instruments – Part 311: General terms relating to measurements– Part 312: General terms relating to electrical measurements – Part 313: Types of electricalmeasuring instruments – Part 314: Specific terms according to the type of instrumentIEC 61000-2-4, Electromagnetic compatibility (EMC) – Part 2-4: Environment – Compatibilitylevels in industrial plants for low-frequency conducted disturbances – Basic EMC publicationIEC 61000-3-8, Electromagnetic compatibility (EMC) – Part 3: Limits – Section 8: Signalling onlow-voltage electrical installations – Emission levels, frequency bands and electromagneticdisturbance levelsIEC 61000-4-7:2002, Electromagnetic compatibility (EMC) – Part 4-7: Testing and measure-ment techniques – General guide on harmonics and interharmonics measurements andinstrumentation, for power supply systems and equipment connected thereto – Basic EMCpublicationIEC 61000-4-15, Electromagnetic compatibility (EMC) – Part 4: Testing and measurementtechniques – Section 15: Flickermeter – Functional and design specificationsIEC 61180 (all parts), High-voltage test techniques for low voltage equipment3 DefinitionsFor the purpose of this part of IEC 61000 the following definitions apply, together with thedefinitions of IEC 60050(161).3.1channelindividual measurement path through an instrumentNOTE
“Channel” and “phase” are not the same.
A voltage channel is by definition the difference in potentialbetween 2 conductors. Phase refers to a single conductor. On polyphase systems, a channel may be between 2phases, or between a phase and neutral, or between a phase and earth.3.2declared input voltage, Udinvalue obtained from the declared supply voltage by a transducer ratio3.3declared supply voltage, Ucdeclared supply voltage Uc is normally the nominal voltage Un of the system. If by agreementbetween the supplier and the customer a voltage different from the nominal voltage is appliedto the terminal, then this voltage is the declared supply voltage Uc3.4dip thresholdvoltage magnitude specified for the purpose of detecting the start and the end of a voltage dip3.5flagged datafor any measurement time interval in which interruptions, dips or swells occur, the measure-ment results of all other parameters made during this time interval are flagged
61000-4-30 © IEC:2003– 13 –3.6flickerimpression of unsteadiness of visual sensation induced by a light stimulus whose luminance orspectral distribution fluctuates with time[IEV 161-08-13]3.7fundamental componentcomponent whose frequency is the fundamental frequency[IEV 101-14-49, modified]3.8fundamental frequencyfrequency in the spectrum obtained from a Fourier transform of a time function, to which all thefrequencies of the spectrum are referred[IEV 101-14-50, modified]NOTE
In case of any remaining risk of ambiguity, the fundamental frequency should be derived from the numberof poles and speed of rotation of the synchronous generator(s) feeding the system.3.9harmonic componentany of the components having a harmonic frequency[IEC 61000-2-2, definition 3.2.4]NOTE
Its value is normally expressed as an r.m.s. value. For brevity, such component may be referred to simplyas a harmonic.3.10harmonic frequencyfrequency which is an integer multiple of the fundamental frequencyNOTE
The ratio of the harmonic frequency to the fundamental frequency is the harmonic order
(IEC 61000-2-2,definition 3.2.3).3.11hysteresisdifference in magnitude between the start and end thresholdsNOTE 1
This definition of hysteresis is relevant to PQ measurement parameters and is different from the IEVdefinition which is relevant to iron core saturation.NOTE 2
The purpose of hysteresis in the context of PQ measurements is to avoid counting multiple events whenthe magnitude of the parameter oscillates about the threshold level.3.12influence quantityany quantity which may affect the working performance of a measuring equipment[IEV 311-06-01, modified]NOTE
This quantity is generally external to the measurement equipment.3.13interharmonic componentcomponent having an interharmonic frequency[IEC 61000-2-2, definition 3.2.6]NOTE
Its value is normally expressed as an r.m.s. value. For brevity, such a component may be referred to simplyas an interharmonic.
61000-4-30 © IEC:2003– 15 –3.14interharmonic frequencyany frequency which is not an integer multiple of the fundamental frequency[IEC 61000-2-2, definition 3.2.5]NOTE 1
By extension from harmonic order, the interharmonic order is the ratio of an interharmonic frequency tothe fundamental frequency. This ratio is not an integer (recommended notation m).NOTE 2
In the case where m < 1 the term subharmonic frequency may be used.3.15interruptionreduction of the voltage at a point in the electrical system below the interruption threshold3.16interruption thresholdvoltage magnitude specified for the purpose of detecting the start and the end of a voltageinterruption3.17measurement uncertaintymaximum expected deviation of a measured value from its actual value3.18nominal voltage, Unvoltage by which a system is designated or identified3.19overdeviationdifference between the measured value and the nominal value of a parameter, only when themeasured value of the parameter is greater than the nominal value3.20power qualitycharacteristics of the electricity at a given point on an electrical system, evaluated against a setof reference technical parametersNOTE
These parameters might, in some cases, relate to the compatibility between electricity supplied on anetwork and the loads connected to that network.3.21r.m.s. (root-mean-square) valuesquare root of the arithmetic mean of the squares of the instantaneous values of a quantitytaken over a specified time interval and a specified bandwidth[IEV 101-14-16 modified]3.22r.m.s. voltage refreshed each half-cycle, Urms(1/2)value of the r.m.s. voltage measured over 1 cycle, commencing at a fundamental zerocrossing, and refreshed each half-cycleNOTE 1
This technique is independent for each channel and will produce r.m.s. values at successive times ondifferent channels for polyphase systems.NOTE 2
This value is used only for voltage dip, voltage swell, and interruption detection.3.23range of influence quantitiesrange of values of a single influence quantity
61000-4-30 © IEC:2003– 17 –3.24reference channelone of the voltage measurement channels designated as the reference channel for polyphasemeasurements3.25residual voltage, Uresminimum value of Urms(1/2) recorded during a voltage dip or interruptionNOTE
The residual voltage is expressed as a value in volts, or as a percentage or per unit value of the declaredinput voltage.3.26sliding reference voltage, Usrvoltage magnitude averaged over a specified time interval, representing the voltage precedinga voltage dip or swellNOTE
The sliding reference voltage is used to determine the voltage change during a dip or a swell.3.27swell thresholdvoltage magnitude specified for the purpose of detecting the start and the end of a swell3.28time aggregationcombination of several sequential values of a given parameter (each determined over identicaltime intervals) to provide a value for a longer time intervalNOTE
Aggregation in this document always refers to time aggregation.3.29underdeviationabsolute value of the difference between the measured value and the nominal value of aparameter, only when the value of the parameter is lower than the nominal value3.30voltage diptemporary reduction of the voltage at a point in the electrical system below a thresholdNOTE 1
Interruptions are a special case of a voltage dip. Post-processing may be used to distinguish betweenvoltage dips and interruptions.NOTE 2
In some areas of the world a voltage dip is referred to as sag. The two terms are consideredinterchangeable; however, this standard will only use the term voltage dip.3.31voltage swelltemporary increase of the voltage at a point in the electrical system above a threshold3.32voltage unbalancecondition in a polyphase system in which the r.m.s. values of the line voltages (fundamentalcomponent), or the phase angles between consecutive line voltages, are not all equal[IEV 161-08-09, modified]NOTE 1
The degree of the inequality is usually expressed as the ratios of the negative- and zero-sequencecomponents to the positive-sequence component.NOTE 2
In this standard, voltage unbalance is considered in relation to 3-phase systems.
61000-4-30 © IEC:2003 – 19 –
4 General
4.1 Classes of measurement performance For each parameter measured, two classes of measurement performance are defined. – Class A performance This class of performance is used where precise measurements are necessary, for example, for contractual applications, verifying compliance with standards, resolving disputes, etc. Any measurements of a parameter carried out with two different instruments complying with the requirements of class A, when measuring the same signals, will produce matching results within the specified uncertainty.
To ensure that matching results are produced, class A performance requires a bandwidth characteristic and a sampling rate sufficient for the specified uncertainty of each parameter. – Class B performance
This class of performance may be used for statistical surveys, trouble-shooting applications, and other applications where low uncertainty is not required. For each performance class the range of influencing factors that shall be complied with is specified in 6.1. Users shall select the class of measurement performance taking account of the situation of each application case. NOTE 1 A measurement instrument may have different performance classes for different parameters.
NOTE 2 The instrument manufacturer should declare influence quantities which are not expressly given and which may degrade performance of the instrument. 4.2 Organization of the measurements The electrical quantity to be measured may be either directly accessible, as is generally the case in low-voltage systems, or accessible via measurement transducers.
The whole measurement chain is shown in Figure 1. MeasurementtransducersMeasurementunitEvaluationunit Input signal tobe measuredElectrical inputsignalMeasurementresultMeasurementevaluationIEC
323/03 Figure 1 – Measurement chain An "instrument" usually includes the whole measurement chain (see Figure 1). In this standard, the normative part does not consider the measurement transducers and their associated uncertainty, but Clause A.2 gives guidance. 4.3 Electrical values to be measured Measurements can be performed on single-phase or polyphase supply systems. Depending on the context, it may be necessary to measure voltages between phase conductors and neutral (line-to-neutral) or between phase conductors (line-to-line) or between neutral and earth. It is not the purpose of this standard to impose the choice of the electrical values to be measured. Moreover, except for the measurement of voltage unbalance, which is intrinsically polyphase, the measurement methods specified in this document are such that independent results can be produced on each measurement channel.
61000-4-30 © IEC:2003 – 21 –
Current measurements can be performed on each conductor of supply systems, including the neutral conductor and the protective earth conductor.
NOTE It is often useful to measure current simultaneously with voltage and to associate the current measurements in 1 conductor with voltage measurements between that conductor and a reference conductor, such as an earth conductor or a neutral conductor.
4.4 Measurement aggregation over time intervals – For class A performance
The basic measurement time inte
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