EN IEC 60034-2-3:2020
(Main)Rotating electrical machines - Part 2-3: Specific test methods for determining losses and efficiency of converter-fed AC motors
Rotating electrical machines - Part 2-3: Specific test methods for determining losses and efficiency of converter-fed AC motors
IEC 60034-2-3:2020 specifies test methods and an interpolation procedure for determining losses and efficiencies of converter-fed motors within the scope of IEC 60034-1:2017. The motor is then part of a variable frequency power drive system (PDS) as defined in IEC 61800‑9‑2:2017. Applying the approach of the comparable converter, the motor efficiency determined by use of this document is applicable for comparison of different motor designs only. The document also specifies procedures to determine motor losses at any load point (torque, speed) within the base speed range (constant torque range, constant flux range) based on determination of losses at seven standardized load points. This procedure is applicable to any variable speed AC motor (induction and synchronous) rated according to IEC 60034-1:2017 for operation on a variable frequency and variable voltage power supply.
Drehende elektrische Maschinen – Teil 2-3: Besondere Verfahren zur Bestimmung der Verluste und des Wirkungsgrades von umrichtergespeisten Wechselstrommaschinen
Machines électriques tournantes - Partie 2-3: Méthodes d'essai spécifiques pour la détermination des pertes et du rendement des moteurs à courant alternatif alimentés par convertisseur
l'IEC 60034-2-3:2020 spécifie les méthodes d’essai et la procédure d’interpolation relatives à la détermination des pertes et des rendements des moteurs alimentés par convertisseur relevant du domaine d’application de l’IEC 60034-1:2017. Le moteur est alors considéré comme faisant partie intégrante d'un système d’entraînement électrique de puissance (PDS – power drive system) à fréquence variable, comme cela est défini dans l’IEC 61800-9-2:2017. Avec l’approche du convertisseur comparable, le rendement du moteur déterminé par l’utilisation du présent document s’applique uniquement à la comparaison des différentes conceptions de moteurs. Le document spécifie également des procédures de détermination des pertes du moteur en tout point de charge (couple, vitesse) dans la plage de vitesses de base (plage de couples constants, plage de flux constants) à partir de la détermination des pertes au niveau de sept points de charge normalisés. Cette procédure s’applique à tout moteur à courant alternatif à vitesse variable (à induction et synchrone) assigné selon l’IEC 60034-1:2017 pour un fonctionnement à fréquence variable et alimenté en tension variable.
Električni rotacijski stroji - 2-3. del: Posebne preskusne metode za ugotavljanje izgub in izkoristka motorja na izmenični tok, napajanega prek pretvornikov (IEC 60034-2-3:2020)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2020
Električni rotacijski stroji - 2-3. del: Posebne preskusne metode za ugotavljanje
izgub in izkoristka motorja na izmenični tok, napajanega prek pretvornikov (IEC
60034-2-3:2020)
Rotating electrical machines - Part 2-3: Specific test methods for determining losses and
efficiency of converter-fed AC motors (IEC 60034-2-3:2020)
Drehende elektrische Maschinen - Teil 2-3: Besondere Verfahren zur Bestimmung der
Verluste und des Wirkungsgrades von umrichtergespeisten Wechselstrommaschinen
(IEC 60034-2-3:2020)
Machines électriques tournantes - Partie 2-3: Méthodes d'essai spécifiques pour la
détermination des pertes et du rendement des moteurs à courant alternatif alimentés par
convertisseur (IEC 60034-2-3:2020)
Ta slovenski standard je istoveten z: EN IEC 60034-2-3:2020
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60034-2-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 29.160.01
English Version
Rotating electrical machines - Part 2-3: Specific test methods for
determining losses and efficiency of converter-fed AC motors
(IEC 60034-2-3:2020)
Machines électriques tournantes - Partie 2-3: Méthodes Drehende elektrische Maschinen - Teil 2-3: Besondere
d'essai spécifiques pour la détermination des pertes et du Verfahren zur Bestimmung der Verluste und des
rendement des moteurs à courant alternatif alimentés par Wirkungsgrades von umrichtergespeisten
convertisseur Wechselstrommaschinen
(IEC 60034-2-3:2020) (IEC 60034-2-3:2020)
This European Standard was approved by CENELEC on 2020-04-23. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60034-2-3:2020 E
European foreword
The text of document 2/1974/FDIS, future edition 1 of IEC 60034-2-3, prepared by IEC/TC 2 "Rotating
machinery" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-01-23
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-04-23
document have to be withdrawn
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 60034-2-3:2020 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/TS 60034-25:2014 NOTE Harmonized as CLC/TS 60034-25:— (not modified)
IEC 61800-2:2015 NOTE Harmonized as EN 61800-2:2015 (not modified)
IEC 61800-4:2002 NOTE Harmonized as EN 61800-4:2003 (not modified)
To be published. Stage at the time of publication: CLC/prTS 60034-25:2017.
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 Where 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
IEC 60034-1 2017 Rotating electrical machines - Part 1: Rating - -
and performance
IEC 60034-2-1 2014 Rotating electrical machines - Part 2-1: EN 60034-2-1 2014
Standard methods for determining losses
and efficiency from tests (excluding
machines for traction vehicles)
IEC 61000-2-4 2002 Electromagnetic compatibility (EMC) - Part EN 61000-2-4 2002
2-4: Environment - Compatibility levels in
industrial plants for low-frequency conducted
disturbances
IEC 61800-9-2 2017 Adjustable speed electrical power drive EN 61800-9-2 2017
systems - Part 9-2: Ecodesign for power
drive systems, motor starters, power
electronics and their driven applications -
Energy efficiency indicators for power drive
systems and motor starters
IEC 60034-2-3 ®
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Rotating electrical machines –
Part 2-3: Specific test methods for determining losses and efficiency of
converter-fed AC motors
Machines électriques tournantes –
Partie 2-3: Méthodes d'essai spécifiques pour la détermination des pertes
et du rendement des moteurs à courant alternatif alimentés par convertisseur
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-7842-0
– 2 – IEC 60034-2-3:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Symbols and abbreviated terms . 9
5 Basic requirements . 10
5.1 Instrumentation . 10
5.1.1 General . 10
5.1.2 Power analyser and transducers . 10
5.1.3 Mechanical output of the motor . 11
5.2 Converter set-up . 11
5.2.1 General . 11
5.2.2 Comparable converter set-up for rated voltages up to 1 kV . 11
5.2.3 Testing with converters with rated voltages above 1 kV . 12
5.2.4 Testing with other converters . 12
6 Test method for the determination of the efficiency of converter-fed motors . 12
6.1 Selection of determination method . 12
6.2 Method 2-3-A – Direct measurement of input and output . 13
6.2.1 Test set-up . 13
6.2.2 Test procedure . 13
6.2.3 Efficiency determination. 13
6.2.4 Measurement at seven standardized operating points . 14
6.3 Method 2-3-B – Summation of losses with determination of additional high
frequency loss at converter supply at no-load operation . 14
6.3.1 General . 14
6.3.2 Test set-up . 14
6.3.3 Test procedure . 14
6.3.4 Efficiency determination. 15
6.4 2-3-C – Alternate Efficiency Determination Method (AEDM) . 15
6.5 2-3-D – Determination of efficiency by calculation . 15
7 Interpolation of losses at any operating point . 16
7.1 General . 16
7.2 Interpolation procedure . 16
7.3 Analytical determination of relative losses at any operating point . 16
7.4 Additional losses due to frequency converter voltage drop . 18
7.5 Alternate operating points to determine interpolation coefficients . 18
7.6 Optional determination of interpolation error . 19
Annex A (informative) Losses of AC motors . 21
A.1 General . 21
A.2 Stator and rotor winding I R losses P (P + P ) . 21
LSR LS LR
A.3 Iron losses (P ) . 21
Lfe
A.4 Additional load losses (P ) . 22
LL
A.5 Friction and windage losses (P ) . 22
Lfw
A.6 Additional high frequency losses (P ) . 23
LHL
IEC 60034-2-3:2020 © IEC 2020 – 3 –
Annex B (informative) Exemplary determination of losses and efficiency at various
load points . 24
B.1 General . 24
B.2 Determination of the interpolation coefficients . 24
B.3 Calculation of losses and efficiency for certain operating points . 25
Bibliography . 27
Figure 1 – Standardized operating points . 17
Table 1 – Preferred test methods . 12
Table 2 – Other test methods . 13
Table 3 – Normative operating points . 17
Table 4 – Non-normative alternate operating points . 19
Table A.1 – Recommended split of windage and friction losses for IC 411 self-
ventilated motors . 22
Table B.1 – Name plate data . 24
Table B.2 – Reference values . 24
Table B.3 – Losses for the 7 operating points . 25
Table B.4 – Interpolation coefficients . 25
Table B.5 – User-defined operating points . 26
Table B.6 – Calculated losses for the user-defined operating points . 26
– 4 – IEC 60034-2-3:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 2-3: Specific test methods for determining losses and
efficiency of converter-fed AC motors
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 60034-2-3 has been prepared by IEC technical committee 2:
Rotating machinery.
This first edition cancels and replaces IEC TS 60034-2-3, published in 2013.
The text of this International Standard is based on the following documents:
FDIS Report on voting
2/1974/FDIS 2/1982/RVD
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.
IEC 60034-2-3:2020 © IEC 2020 – 5 –
A list of all parts in the IEC 60034 series, published under the general title Rotating electrical
machines, 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.
– 6 – IEC 60034-2-3:2020 © IEC 2020
INTRODUCTION
The objective of this document is to define test methods for determining total losses including
additional high frequency motor losses and efficiency of converter-fed motors. Additional high
frequency losses appear in addition to the losses on nominally sinusoidal power supply as
determined by the methods of IEC 60034-2-1:2014. Results determined according to this
document are intended to allow comparison of losses and efficiency of different motors when
fed by converters.
Furthermore, the document gives seven standardized operating points to characterize the
development of losses and efficiency across the whole torque/speed range. An interpolation
procedure is provided to calculate losses and efficiency at any operating point (torque, speed).
In power-drive systems (PDS), the motor and the frequency converter are often manufactured
by different suppliers. Motors of the same design are produced in large quantities. They may
be operated from the grid or from frequency converters of many different types, supplied by
many different manufacturers. The individual converter properties (switching frequency, DC link
voltage level, etc.) will also influence the system efficiency. As it is impractical to determine
motor losses for every combination of motor, frequency converter, connection cable, output
filter and parameter settings, this document describes a limited number of approaches,
depending on the voltage level and the rating of the machine under test.
The losses determined according to this document are not intended to represent the losses in
the final application. They provide, however, an objective basis for comparing different motor
designs with respect to suitability for converter operation.
In general, when fed from a converter, motor losses are higher than during operation on a
nominally sinusoidal system. The additional high frequency losses depend on the harmonic
spectrum of the impressed converter output quantity (either current or voltage) which is
influenced by its circuitry and control method. For further information,
see IEC TS 60034-25:2014.
It is not the purpose of this document to define test procedures either for power drive systems
or for frequency converters alone.
Comparable converter
Latest experience and theoretical analysis have shown that the additional high frequency motor
losses generally do not increase much with load. The methods in this document are mainly
based on supplies from converters with pulse width modulation (PWM).
With respect to these types of converters and the growing need for verification of compliance
with national energy efficiency regulations, this document defines a so-called comparable
converter for testing of low voltage motors.
In principle, the comparable converter is a voltage source with a typical high frequency harmonic
content supplying the machine under test. It is not applicable to medium voltage motors.
Limitations for the application of the comparable converter
It has to be noted that the test method with the comparable converter described herein is a
standardized method intended to give comparable efficiency figures for standardized test
conditions. A motor ranking with respect to suitability for converter operation may be derived,
but it is not equivalent to determining of the actual motor losses for operation with a specific
converter which requires a test of the whole power drive system (PDS) with the specific
converter used in the final application.
IEC 60034-2-3:2020 © IEC 2020 – 7 –
Deviations are also expected for motors driven by multi-level voltage source or current source
converters where the additional high frequency motor losses differ much more depending on
speed and load than for two-level voltage source converters. Hence the determination of losses
and efficiency should preferably use procedures where the motor is operated together with the
same converter with which it is driven in service.
Another option is the determination of the additional high frequency motor losses by calculation.
If this is requested by the customer, the pulse pattern of the converter is required. Such
procedures are not part of this document.
The provided interpolation procedure for the determination of losses and efficiency at any
operating point (torque, speed) is limited to the base speed range (constant torque range,
constant flux range).
– 8 – IEC 60034-2-3:2020 © IEC 2020
ROTATING ELECTRICAL MACHINES –
Part 2-3: Specific test methods for determining losses and
efficiency of converter-fed AC motors
1 Scope
This part of IEC 60034 specifies test methods and an interpolation procedure for determining
losses and efficiencies of converter-fed motors within the scope of IEC 60034-1:2017. The
motor is then part of a variable frequency power drive system (PDS) as defined in
IEC 61800-9-2:2017.
Applying the approach of the comparable converter, the motor efficiency determined by use of
this document is applicable for comparison of different motor designs only.
The document also specifies procedures to determine motor losses at any load point (torque,
speed) within the base speed range (constant torque range, constant flux range) based on
determination of losses at seven standardized load points. This procedure is applicable to any
variable speed AC motor (induction and synchronous) rated according to IEC 60034-1:2017 for
operation on a variable frequency and variable voltage power supply.
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 60034-1:2017, Rotating electrical machines – Part 1: Rating and performance
IEC 60034-2-1:2014, Rotating electrical machines – Part 2-1: Standard methods for
determining losses and efficiency from tests (excluding machines for traction vehicles)
IEC 61000-2-4:2002, Electromagnetic compatibility (EMC) – Part 2-4: Environment –
Compatibility levels in industrial plants for low-frequency conducted disturbances
IEC 61800-9-2:2017, Adjustable speed electrical power drive systems – Part 9-2: Ecodesign for
power drive systems, motor starters, power electronics and their driven applications – Energy
efficiency indicators for power drive systems and motor starters
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60034-1:2017,
IEC 60034-2-1:2014 as well as 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
IEC 60034-2-3:2020 © IEC 2020 – 9 –
3.1
motor losses with converter supply
when powered by a converter, motor losses are a combination of losses caused by fundamental
frequency and losses caused by the converter high frequencies
3.2
fundamental losses
fundamental losses in the motor can be segregated into five different components: iron losses
(varying with motor frequency and applied fundamental voltage), friction and windage losses
(varying with motor speed), rotor winding losses, stator winding losses and additional load
losses (all three varying with motor current). Fundamental losses are the losses of a motor
running with application of rated voltage at fundamental frequency that does not contain any
further high frequencies.
3.3
additional high frequency losses
additional high frequency losses are produced in the motor by the non-sinusoidal voltage and
current waveforms generated by the converter and are in addition to the losses of iron, friction
and windage, rotor winding, stator winding and additional load loss (fundamental losses)
3.4
base speed range
speed range from standstill up to the highest speed where the motor can be supplied with a
voltage that changes in proportion to the speed so that the magnetic flux remains constant
(constant ratio U/f) for induction machines and according to the MTPA (maximum torque per
ampere) for synchronous machines. Within the base speed range, the maximum motor torque
is constant (constant torque range), if constant flux control is used.
3.5
switching frequency
number of switching events of one semiconductor within one second. It determines, together
with the selected pulse pattern and the converter topology, the lowest frequency of non-
controllable high frequencies or inter-harmonics at the IPC (in-plant point of coupling) or the
motor
Note 1 to entry: For a two level converter, the pulse frequency measured phase to phase is two times the switching
frequency defined in 3.5 in case of continuous modulation and about 1,33 times the switching frequency defined in
3.5 in case of discontinuous modulation. A switching event is once on and once off of one semiconductor.
4 Symbols and abbreviated terms
f Frequency, Hz
f Fundamental motor frequency, Hz
Mot
f Rated motor frequency, Hz
N
f Switching frequency, Hz
sw
I No-load current, A
I Rated current, A
N
MTPA Maximum torque per ampere control applied to synchronous motors
−1
n Speed, min
−1
n Rated speed, min
N
−1
n Reference speed, min
ref
P Power, W
P Constant losses at converter supply, W
Ccon
– 10 – IEC 60034-2-3:2020 © IEC 2020
P Constant losses at sinusoidal supply according to IEC 60034-2-1:2014, W
Csin
PDS Power drive system
P Additional high frequency loss due to converter supply, W
LHL
P Rated power, W
N
P Reference power, W
ref
P Motor input power at converter supply, W
1C
P Motor input power as tested according to IEC 60034-2-1:2014, W
1_60034-2-1
P Motor output power at converter supply, W
2C
P Motor output power as tested according to IEC 60034-2-1:2014, W
2_60034-2-1
PWM Pulse width modulation
T Machine torque, Nm
T Machine torque at converter supply, Nm
C
T Rated torque, Nm
N
T Reference torque, Nm
ref
U Rated motor voltage, V
N
η Efficiency
5 Basic requirements
5.1 Instrumentation
5.1.1 General
Unless otherwise stated in this document, the arithmetic average of the three line currents and
voltages shall be used.
When testing electric machines under load, slow fluctuations in the output power and other
measured quantities may be unavoidable. Therefore for each load point many readings shall be
taken automatically by a suitable digital meter over a period of at least 15 s but not more than
60 s and this average shall be used for the determination of efficiency.
Considering the high frequencies involved in converters feeding AC motors and their
contribution to the motor losses, the measuring equipment has to be selected according to the
range of relevant frequencies with sufficient accuracy.
For temperature measurements, a thermosensor installed in the hot spot may be optionally
used, as described in IEC 60034-2-1:2014.
5.1.2 Power analyser and transducers
The instrumentation for measuring power and current at the motor’s input shall basically meet
the requirements of IEC 60034-2-1:2014, but due to higher frequency components the following
additional requirements shall also apply.
The specified uncertainty of the power meters shall be 0,2 % of the rated apparent power of the
motor or better for the total active power at 50 Hz or 60 Hz. This is the total uncertainty of the
power meter including possible sensors.
NOTE 1 For example, when a three-phase motor has a rated voltage of 400 V and a rated current of 10 A then the
power meter's active power uncertainty is at least 0,2 % of √3 times 4 000 VA, which is 13,9 W or better.
IEC 60034-2-3:2020 © IEC 2020 – 11 –
The bandwidth of power meters and sensors shall be sufficiently wide that the error in the
measurement of total active power for the entire frequency range (beyond 50 Hz and 60 Hz) is
less than or equal to 0,3 % of the apparent power.
NOTE 2 In general, a bandwidth from 0 Hz up to 10 times of switching frequency is sufficient.
It is preferred to
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