IEC 62053-24:2020

IEC 62053-24 ®
Edition 2.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electricity metering equipment – Particular requirements –
Part 24: Static meters for fundamental component reactive energy
(classes 0,5S, 1S, 1, 2 and 3)

Équipement de comptage de l'électricité – Exigences particulières –
Partie 24: Compteurs statiques d'énergie réactive de composante fondamentale
(classes 0,5S, 1S, 1, 2 et 3)
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IEC 62053-24 ®
Edition 2.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electricity metering equipment – Particular requirements –

Part 24: Static meters for fundamental component reactive energy

(classes 0,5S, 1S, 1, 2 and 3)

Équipement de comptage de l'électricité – Exigences particulières –

Partie 24: Compteurs statiques d'énergie réactive de composante fondamentale

(classes 0,5S, 1S, 1, 2 et 3)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20; 91.140.50 ISBN 978-2-8322-8305-9

– 2 – IEC 62053-24:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 10
4 Standard electrical values. 10
4.1 Voltages . 10
4.2 Currents . 10
4.2.1 General . 10
4.2.2 Starting current (see Table 1) . 10
4.2.3 Minimum current (see Table 2) . 10
4.2.4 Maximum current . 10
4.3 Frequencies . 11
4.4 Power consumption . 11
5 Construction requirements . 11
6 Meter marking and documentation . 11
7 Accuracy requirements . 11
7.1 General test conditions . 11
7.2 Methods of accuracy verification . 11
7.3 Measurement uncertainty . 11
7.4 Meter constant . 11
7.5 Initial start-up of the meter . 11
7.6 Test of no-load condition . 11
7.7 Starting current test . 11
7.8 Repeatability test . 11
7.9 Limits of error due to variation of the current . 11
7.10 Limits of error due to influence quantities . 12
7.11 Time-keeping accuracy . 14
8 Climatic requirements . 15
9 The effects of external influences . 15
10 Type test . 15
Annex A (informative) Comparison of acceptable percentage error limits at reference
conditions for meters . 16
Annex B (informative) Geometric representation of active and reactive power. 17
Annex C (informative) Influence of the phase displacement of current and voltage
transformers on reactive energy measurement . 19
Annex D (informative) Treatment of harmonics and tests for harmonics . 20
D.1 Non- sinusoidal conditions and reactive power definition . 20
D.2 Tests for accuracy under non-sinusoidal conditions . 20
D.3 Fifth harmonic test . 21
Annex E (informative) Summary of changes . 22

Figure A.1 – Acceptable percentage error limits, transformer operated (S) and directly
connected meters, I = 5 A, I = 10 A, PF = 1,0 . 16
n max
Figure A.2 – Acceptable percentage error limits, transformer operated (S) and directly
connected meters, I = 5 A, I = 10 A, PF = 0,5 inductive / 0,8 capacitive . 16
n max
Figure B.1 – Recommended geometric representation . 17
Figure B.2 – Alternative geometric representation . 18

Table 1 – Starting current . 10
Table 2 – Minimum current. 10
Table 3 – Acceptable percentage error limits (single-phase meters and poly-phase
meters with balanced loads or single-phase loads) . 12
Table 4 – Acceptable limits of variation in percentage error due to influence quantities . 13
Table C.1 – Phase displacements for current transformer connected meters without
voltage transformers and corresponding maximum measurement errors for reactive
energy . 19
Table C.2 – Phase displacements for current and voltage transformer connected
meters and corresponding maximum measurement errors for reactive energy . 19

– 4 – IEC 62053-24:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICITY METERING EQUIPMENT –
PARTICULAR REQUIREMENTS –
Part 24: Static meters for fundamental component reactive energy
(classes 0,5 S, 1 S, 1, 2 and 3)

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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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6) All users should ensure that they have the latest edition of this publication.
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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 62053-24 has been prepared by IEC technical committee 13:
Electrical energy measurement and control.
This second edition cancels and replaces the first edition published in 2014 and its amendment
1:2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition: see Annex E.
The text of this International Standard is based on the following documents:
FDIS Report on voting
13/1804/FDIS 13/1811/RVD
13/1804(F)/FDIS
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 62053 series, published under the general title Electricity metering
equipment – Particular requirements, 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.
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation nationally
not earlier than 2 years from the date of publication.

– 6 – IEC 62053-24:2020 © IEC 2020
INTRODUCTION
This part of IEC 62053 is to be used with relevant parts of the IEC 62052, IEC 62058 and
IEC 62059 series, Electricity metering equipment, and with the IEC 62055 series, Electricity
metering – Payment systems:
IEC 62052‑11:2020, Electricity metering equipment – General requirements, tests
and test conditions – Part 11: Metering equipment
IEC 62052‑31:2015, Electricity metering equipment (AC) – General requirements,
tests and test conditions – Part 31: Product safety
requirements and tests
IEC 62053‑11:2003, Electricity metering equipment (AC) – Particular requirements
– Part 11: Electromechanical meters for active energy
(classes 0,5, 1 and 2)
IEC 62053-21:2020 Electricity metering equipment – Particular requirements –
Part 21: Static meters for AC active energy (classes 0,5, 1
and 2)
IEC 62053‑22:2020, Electricity metering equipment – Particular requirements –
Part 22: Static meters for AC active energy (classes 0,1 S,
0,2S and 0,5 S)
IEC 62053‑23:2020, Electricity metering equipment – Particular requirements –
Part 23: Static meters for reactive energy (classes 2 and 3)
IEC 62055‑31:2005 Electricity metering – Payment systems – Part 31: Particular
requirements – Static payment meters for active energy
(classes 1 and 2)
IEC 62057‑1: – Test equipment, techniques and procedures for electrical
energy meters – Part 1: Stationary Meter Test Units (MTU)
IEC 62058‑11:2008, Electricity metering equipment (AC) – Acceptance inspection -
–Part 11: General acceptance inspection methods
IEC 62058‑21:2008, Electricity metering equipment (AC) – Acceptance inspection
– Part 21: Particular requirements for electromechanical
meters for active energy (classes 0,5, 1 and 2)
IEC 62058‑31:2008, Electricity metering equipment (AC) – Acceptance inspection
– Part 31: Particular requirements for static meters for active
energy (classes 0,2 S, 0,5 S, 1 and 2)
IEC 62059‑11:2002, Electricity metering equipment – Dependability – Part 11:
General concepts
IEC 62059‑21:2002, Electricity metering equipment – Dependability – Part 21:
Collection of meter dependability data from the field
IEC 62059‑32‑1:2011, Electricity metering equipment – Dependability – Part 32-1:
Durability – Testing of the stability of metrological
characteristics by applying elevated temperature

This part is a standard for type testing electricity meters. It covers the particular requirements
for meters, being used indoors and outdoors in large quantities worldwide. It does not deal with
special implementations (such as metering-part and/or displays in separate housings).
This document is intended to be used in conjunction with IEC 62052-11:2020 and with
IEC 62052-31:2015. When any requirement in this document concerns an item already covered
in IEC 62052-11:2020 or in IEC 62052-31:2015, the requirements of this document take
precedence over the requirements of IEC 62052-11:2020 or of IEC 62052-31:2015.

The test levels are regarded as minimum values that provide for the proper functioning of the
meter under normal working conditions. For special applications, additional test levels might be
necessary and are subject to an agreement between the manufacturer and the purchaser.

– 8 – IEC 62053-24:2020 © IEC 2020
ELECTRICITY METERING EQUIPMENT –
PARTICULAR REQUIREMENTS –
Part 24: Static meters for fundamental component reactive energy
(classes 0,5 S, 1 S, 1, 2 and 3)

1 Scope
This part of IEC 62053 applies only to static var-hour meters of accuracy classes 0,5 S, 1 S, 1,
2 and 3 for the measurement of alternating current electrical reactive energy in 50 Hz or 60 Hz
networks and it applies to their type tests only.
This document uses a conventional definition of reactive energy where the reactive power and
energy is calculated from the fundamental frequency components of the currents and voltages
only (see Clause 3).
NOTE 1 This differs from IEC 62053-23, where reactive power and energy is only defined for sinusoidal signals. In
this document reactive power and energy is defined for all periodic signals. Reactive power and energy is defined in
this way to achieve proper reproducibility of measurements with meters of different designs. With this definition,
reactive power and energy reflects the generally unnecessary current possible to compensate with capacitors rather
than the total unnecessary current.
NOTE 2 For other general requirements, such as safety, dependability, etc., see the relevant IEC 62052 or
IEC 62059 standards.
This document applies to electricity metering equipment designed to:
• measure and control electrical energy on electrical networks (mains) with voltage up to
1 000 V AC;
NOTE 3 For AC electricity meters, the voltage mentioned above is the line-to-neutral voltage derived from nominal
voltages. See IEC 62052-31:2015, Table 7;
• have all functional elements, including add-on modules, enclosed in, or forming a single
meter case with exception of indicating displays;
• operate with integrated or detached indicating displays, or without an indicating display;
• be installed in a specified matching socket or rack;
• optionally, provide additional functions other than those for measurement of electrical
energy.
Meters designed for operation with low power instrument transformers (LPITs as defined in the
IEC 61869 series) may be considered as compliant with this document only if such meters and
their LPITs are tested together and meet the requirements for directly connected meters.
NOTE 4 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude,
current magnitude, power, frequency, power factor, etc.; measurement of power quality parameters; load control
functions; delivery, time, test, accounting, recording functions; data communication interfaces and associated data
security functions. The relevant standards for these functions may apply in addition to the requirements of this
document. However, the requirements for such functions are outside the scope of this document.
NOTE 5 Product requirements for power metering and monitoring devices (PMDs) and measurement functions such
as voltage magnitude, current magnitude, power, frequency, etc., are covered in IEC 61557-12. However, devices
compliant with IEC 61557-12 are not intended to be used as billing meters unless they are also compliant with the
IEC 62052-11:2020 and one or more relevant IEC 62053-xx accuracy class standards.
NOTE 6 Product requirements for power quality instruments (PQIs) are covered in IEC 62586-1. Requirements for
power quality measurement techniques (functions) are covered in IEC 61000-4-30. Requirements for testing of the
power quality measurement functions are covered in IEC 62586-2.

This document does not apply to:
• meters for which the voltage line-to-neutral derived from nominal voltages exceeds
1 000 V AC;
• meters intended for connection with low power instrument transformers (LPITs as defined
in the IEC 61869 series) when tested without such transformers;
• metering systems comprising multiple devices (except LPITs) physically remote from one
another;
• portable meters;
NOTE 7 Portable meters are meters that are not permanently connected;
• meters used in rolling stock, vehicles, ships and airplanes;
• laboratory and meter test equipment;
• reference standard meters;
• data interfaces to the register of the meter;
• matching sockets or racks used for installation of electricity metering equipment;
• any additional functions provided in electrical energy meters.
This document does not cover measures for the detection and prevention of fraudulent attempts
to compromise a meter’s performance (tampering).
NOTE 8 Nevertheless, specific tampering detection and prevention requirements, and test methods, as relevant for
a particular market are subject to the agreement between the manufacturer and the purchaser.
NOTE 9 Specifying requirements and test methods for fraud detection and prevention would be counterproductive,
as such specifications would provide guidance for potential fraudsters.
NOTE 10 There are many methods of tampering with meters reported from various markets; designing meters to
detect and prevent all kinds of tampering would lead to unjustified increase in costs of meter design, verification and
validation.
NOTE 11 Billing systems, such as, smart metering systems, are capable of detecting irregular consumption patterns
and irregular network losses which enable discovery of suspected meter tampering.
NOTE 12 For transformer operated meters paired with current transformers (CTs) according to IEC 61869-2:
– the standard CT measuring range is specified from 0,05 I to I for accuracy classes 0,1, 0,2, 0,5 and 1 and
n max
these CTs are used for meters of class 1, 2 and 3 according to this document;
– the special CT measuring range is specified from 0,01 I to I for accuracy classes 0,2S and 0,5 S and these
n max
CTs are used for meters of class 0,5 S and 1 S according to this document;
– combinations of standard CTs and meters of class 0,5 S and 1 S are subject to an agreement between
manufacturers and purchasers.
NOTE 13 This document does not specify emission requirements, these are specified in IEC 62052-11:2020, 9.3.14.
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 60375:2018, Conventions concerning electric circuits
IEC 62052-11:2020, Electricity metering equipment – General requirements, tests and test
conditions – Part 11: Metering equipment

– 10 – IEC 62053-24:2020 © IEC 2020
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62052-11:2020 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia website: http://www.electropedia.org
• ISO Online Browsing Platform website: http://www.iso.org/obp
NOTE 1 For direction of flow and sign of reactive power, see Annex B.
NOTE 2 The actual algorithm used for the calculation of reactive power is not of importance as long as the meter
meets requirements of this document. See also Annex D.
NOTE 3 While meters for active energy measure active energy including harmonic components, reactive energy
meters according to this document measure fundamental component reactive energy, with minimum influence from
harmonics.
4 Standard electrical values
4.1 Voltages
The values given in IEC 62052-11:2020 apply.
4.2 Currents
4.2.1 General
The values given in IEC 62052-11:2020 apply.
4.2.2 Starting current (see Table 1)
Table 1 – Starting current
Starting current I
Meters for sin ϕ
st
class 0,5 S classes class class (inductive or
1 S, 1 2 3 capacitive)
Direct connection - 0,004 I 0,005 I 0,01 I 1
n n n
Connection through current transformers 0,001 I 0,002 I 0,003 I 0,005 I 1
n n n n
4.2.3 Minimum current (see Table 2)
Table 2 – Minimum current
Meters for Minimum current I
min
class class
0,5 S, 1 S 1, 2 and 3
Direct connection --- 0,05 I
n
Connection through current transformers 0,01 I 0,02 I
n n
4.2.4 Maximum current
The requirements given in IEC 62052-11:2020 apply.

4.3 Frequencies
The values given in IEC 62052-11:2020 apply.
4.4 Power consumption
The values given in IEC 62052-11:2020 apply.
5 Construction requirements
The requirements of IEC 62052-11:2020 apply.
6 Meter marking and documentation
The requirements of IEC 62052-11:2020 apply.
7 Accuracy requirements
7.1 General test conditions
Tests and test conditions given in IEC 62052-11:2020 apply.
7.2 Methods of accuracy verification
Tests and test conditions given in IEC 62052-11:2020 apply.
7.3 Measurement uncertainty
The measurement uncertainty estimation methods given in IEC 62052-11:2020 apply.
7.4 Meter constant
The requirements of IEC 62052-11:2020 apply.
7.5 Initial start-up of the meter
The requirements of IEC 62052-11:2020 apply.
7.6 Test of no-load condition
Tests and test conditions given in IEC 62052-11:2020 apply.
7.7 Starting current test
Tests and test conditions given in IEC 62052-11:2020 apply.
7.8 Repeatability test
Tests and test conditions given in IEC 62052-11:2020 apply.
7.9 Limits of error due to variation of the current
When the meter is operated under the reference conditions given in 7.1, the percentage errors
shall not exceed the limits for the relevant accuracy class given in Table 3.
If the meter is designed for the measurement of energy in both directions, the values in
Table 3 shall apply for each direction.

– 12 – IEC 62053-24:2020 © IEC 2020
If the meter is rated for multiple connection modes, the accuracy testing results are valid only
for the connection modes tested and cannot be used to claim accuracy for other, untested
connection modes.
Table 3 – Acceptable percentage error limits
(single-phase meters and poly-phase meters with balanced loads or single-phase loads)
Acceptable percentage error limits
Value of current
sin ϕ for meters of class
(inductive or
for transformer
for directly
capacitive)
a a
1 2 3
0,5 S 1 S
a,b
connected meters operated meters
I ≤ I < 0,1 I I ≤ I < 0,05 I 1 ±1,0 ±1,5 ±1,5
±2,5 ±4,0
min n min n
0,1 I ≤ I ≤ I 0,05 I ≤ I ≤ I 1 ±0,5 ±1,0 ±1,0
±2,0 ±3,0
n max n max
0,1 I ≤ I < 0,2 I 0,05 I ≤ I < 0,1 I 0,5 ±1,0 ±1,5 ±1,5
±2,5 ±4,0
n n n n
0,2 I ≤ I ≤ I 0,1 I ≤ I ≤ I 0,5 ±0,5 ±1,0 ±1,0
±2,0 ±3,0
n max n max
0,2 I ≤ I ≤ I 0,1 I ≤ I ≤ I 0,25 ±1,0 ±2,0 ±2,0
±2,5 ±4,0
n max n max
a
It is recommended that current transformers of accuracy class 0,2S / 0,5 S are used with meters of accuracy
class 0,5 S / 1 S respectively in order to keep the overall system error – due to the phase displacement – on a
low level. See also Annex C.
b
The current transformers under IEC 61869-2 have a lowest load point at 0,05 I for class 0,1 to class 1, and
n
0,01 In for class 0,2S and 0,5 S.

When testing poly-phase meters for compliance with Table 3 requirements for single phase
loads, the test current shall be applied to each measuring element in sequence, while all the
phase voltages shall remain balanced.
7.10 Limits of error due to influence quantities
Tests and test conditions given in IEC 62052-11:2020, 7.1 apply.
If the meter is rated for multiple connection modes, the accuracy requirements apply for each
of the connection modes. All tests of effects of influence quantities shall be performed in one
connection mode selected to exercise the complete metrological capability of the meter.
When the current and the phase displacement (sinφ ) are held constant as specified in Table 4,
and any single influence quantity is applied one at a time, with the meter otherwise operated at
reference conditions as specified in IEC 62052-11:2020, 7.1, the variation in percentage error
relative to the intrinsic error shall not exceed the limits specified for the relevant class indexes
given in Table 4.
The variation in percentage error induced by the influence quantities may vary depending on
the value of the test current. The variation in percentage error in Table 4 is given for the
specified values or ranges of the test current, but the testing should be performed at the
recommended values of test current given in Table 4.

Table 4 – Acceptable limits of variation in percentage error due to influence quantities
Acceptable limits of
Specified range or value and
variation
recommended value of test
in percentage error
current
for meters of class
(balanced unless otherwise
Test clause in
c
Influence quantity sin ϕ
stated)
IEC 62052‑11:2020
0,5
for directly for transformer-
1 S 1 2 3
S
connected operated
meters meters
Radiated, radio-
frequency,
I
electromagnetic 9.3.5 1 2,0 2,0 2,0 3,0 3,0
n
field immunity test
– test with current
Electrical fast
transient/burst 9.3.6 I 1 2,0 4,0 4,0 6,0 6,0
immunity test
Immunity to
conducted
I
disturbances, 9.3.7 1 2,0 2,0 2,0 3,0 3,0
n
induced by radio-
frequency fields
Test for immunity
to conducted,
differential mode
disturbances and
I
9.3.8 1 2,0 4,0 4,0 6,0 6,0
n
signalling in the
frequency range
2 kHz to 150 kHz at
AC power ports
Damped oscillatory
I
wave immunity 9.3.11 --- 1 2,0 2,0 n/a 3,0 4,0
n
d
test
External static
I
9.3.12 1 2,0 2,0 2,0 3,0 3,0
n
magnetic fields
Power frequency
I
magnetic field 9.3.13 1 1,0 2,0 2,0 3,0 3,0
n
immunity test
Harmonics in the
current and voltage
0,5 I
9.4.2.2 1 0,5 0,8 0,8 1,0 1,5
th max
circuits – 5
harmonic test
Interharmonics in
the AC current
0,5 I
9.4.2.3 1 1,5 3,0 3,0 6,0 6,0
n
circuit – burst fired
waveform test
Odd harmonics in
0,5 I
the AC current 9.4.2.4 1 1,5 3,0 3,0 6,0 6,0
n
circuit
DC and even
I
harmonics – half- max
9.4.2.5 --- n/a n/a 3,0 6,0 6,0
wave rectified
0,5
f
waveform test
I ≤ I ≤ I
min max
1 0,25 0,5 0,5 1,0 2,0
(I )
n
Voltage variation 9.4.3
0,1 I ≤ I ≤ I 0,05 I ≤ I ≤ I
n max n max
0,5 0,5 1,0 1,0 1,5 3,0
(I ) (I )
n n
– 14 – IEC 62053-24:2020 © IEC 2020
Acceptable limits of
Specified range or value and
variation
recommended value of test
in percentage error
current
for meters of class
(balanced unless otherwise
Test clause in
c
Influence quantity
sin ϕ
stated)
IEC 62052‑11:2020
0,5
for directly for transformer-
1 S 1 2 3
S
connected operated
meters meters
I ≤ I ≤ I
min max
1 0,03  0,05 0,05 0,10 0,15
(I )
n
Ambient
temperature
9.4.4
0,2 I ≤ I ≤ I 0,1 I ≤ I ≤ I
n
b n max max
variation
0,5 0,05 0,07 0,07 0,15 0,25
(I ) (I )
n n
Interruption of
I
9.4.5 1 1,0 2,0 2,0 4,0 4,0
n
phase voltage
I ≤ I ≤ I
min max
1 0,5 1,0 1,0 2,0 3,0
(I )
n
Frequency variation 9.4.6
0,1 I ≤ I ≤ I 0,05 I ≤ I ≤ I
n max n max
0,5 0,5 1,0 1,0 2,0 3,0
(I ) (I )
n n
Reversed phase
0,1 I
9.4.7 1 0,1 0,5 0,5 1,0 1,5
n
sequence
Auxiliary voltage I
min
9.4.8 1 0,1 0,2 0,2 0,4 0,6
variation
Operation of
I
9.4.9 1 0,1 0,2 0,2 0,4 0,6
min
auxiliary devices
I
--- n/a n/a 1,5 1,5 1,5
n
Short-time
9.4.10 1
e
overcurrents
I
--- 0,2 0,5 0,5 1,0 1,5
n
1 0,2 0,7 0,7 1,0 1,5
a
I
Self-heating 9.4.11
max
0,5 0,2 1,0 1,0 1,5 2,0
Fast load current
I
9.4.12 1 1,0 2,0 2,0 3,0 3,0
n
variations
e
I
Earth fault 9.4.13 --- 1 0,25 0,5 n/a 1,0 1,5
n
e
I
0,25 0,5 0,5 1 1,5
Dry heat test 8.3.3 1
n
e
I 0,25 0,5 0,5 1 1,5
8.3.4 1
Cold test
n
Damp heat cyclic 0,25 0,5 0,5 1 1,5
I
8.3.5 1
e n
test
a
The test shall be carried out for at least 1 h, or until the variation of error during 20 min does not exceed 0,2 %.
b
These values shall be considered as mean temperature coefficients %/K for meters of class.
c
Inductive or capacitive.
d
Voltage transformer operated meters only.
e
For these tests, the meter accuracy is measured before and after the test. The difference in percentage error
before and after the test shall not exceed the error limits specified in this table. These errors limits may be
interpreted as allowable meter accuracy drift induced by the specified test conditions.
f
The purpose of this test is to check for current sensor saturation only. This test does not apply to transformer-
operated meters.
7.11 Time-keeping accuracy
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply.
8 Climatic requirements
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply.
9 The effects of external influences
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply. Table 13 in IEC 62052-11:2020 gives an overview of the
requirements. For tests with acceptance criteria A, Table 4 of this document shall be used.
10 Type test
The requirements given in IEC 62052-11:2020 apply.

– 16 – IEC 62053-24:2020 © IEC 2020
Annex A
(informative)
Comparison of acceptable percentage error limits
at reference conditions for meters

Figure A.1 – Acceptable percentage error limits, transformer operated (S) and directly
connected meters, I = 5 A, I = 10 A, PF = 1,0
n max
Figure A.2 – Acceptable percentage error limits, transformer operated (S) and directly
connected meters, I = 5 A, I = 10 A, PF = 0,5 inductive / 0,8 capacitive
n max
NOTE Class 1 for transformer operated meters is not shown in the diagrams, Class 1 acceptable limits are only for
direct connection.
Annex B
(informative)
Geometric representation of active and reactive power

NOTE 1 Diagram in accordance with Clauses 12 and 14 of IEC 60375:2018.
NOTE 2 Reference of this diagram is the current vector (fixed on right-hand line).
NOTE 3 The voltage vector V varies its direction according to the phase angle ϕ.
NOTE 4 The phase angle ϕ between voltage V and current I is taken positive in the mathematical sense (counter
clockwise).
Figure B.1 – Recommended geometric representation

– 18 – IEC 62053-24:2020 © IEC 2020

NOTE 1 If the upright line is taken as the voltage vector and a line is drawn to represent the current vector of a
single-phase or balanced three-phase system, this current vector will indicate the condition of the other quantities.
NOTE 2 Reference of this diagram is the voltage vector V (fixed on upright line).
NOTE 3 The current vector I varies its direction according to the phase angle ϕ.
NOTE 4 The phase angle ϕ between current I and voltage V is taken positive in the clockwise direction.
Figure B.2 – Alternative geometric representation

Annex C
(informative)
Influence of the phase displacement of current and
voltage transformers on reactive energy measurement
This annex explains the influence on the measurement of reactive energy at low sin φ conditions
of the phase displacement of instrument transformers on the complete system consisting of
instrument transformers and meters.
In typical operating conditions, the power factor on the electricity distribution network is above
cos φ = 0,8 (sin φ < 0,6) and for transmission networks above cos φ = 0,925 (sin φ < 0,4).
The phase displacement of current transformers of various accuracy classes at 100 % of the
nominal current and the resulting reactive energy measurement error are shown in Table C.1.
The values are from IEC 61869-2.
Table C.1 – Phase displacements for current transformer
connected meters without voltage transformers and
corresponding maximum measurement errors for reactive energy
± Phase displacement at
Reactive energy Reactive energy Reactive energy
100 %of rated current
Accuracy class measurement error measurement error measurement error
of CT contribution at contribution at contribution at
Centi-
Minutes
sin φ = 0,5 sin φ = 0,25 sin φ = 0,2
radians
1 60 1,8 3,1 % 7,0 % 8,8 %
0,5 / 0,5 S 30 0,9 1,6 % 3.5 % 4,4 %
0,2 / 0,2 S 10 0,3 0,5 % 1,2 % 1,5 %
Corresponding cos φ for active energy 0,866 0,986 0,979

The phase displacement of current transformers and voltage transformers of various accuracy
classes at 100 % of the nominal current and rated voltage, respectively, and the resulting
reactive energy measurement error are shown in Table C.2. The values are from IEC 61869-2.
Table C.2 – Phase displacements for current and voltage transformer connected meters
and corresponding maximum measurement errors for reactive energy
± Phase ± Phase
Reactive Reactive Reactive
displacement at displacement at
energy energy energy
100 %of rated 100 %of rated
Accuracy Accuracy measurement measurement measurement
current voltage
class of CT class of VT error error error
contribution at contribution at contribution at
Centi- Centi-
Minutes Minutes
sin φ = 0,5 sin φ = 0,25 sin φ = 0,2
radians radians
1,0 60 1,8 1,0 40 1,2 5,2 % 11,6 % 14,6 %
0,5 / 0,5 S 30 0,9 0,5 20 0,6 2,6 % 5,8 % 7,3 %
0,2 / 0,2 S 10 0,3 0,2 10 0,3 1,0 % 2,3 % 2,9 %
0,1 5 0,15 0,1 5 0,15 0,5 % 1,2 % 1,5 %
Corresponding cos φ for active energy 0,866 0,986 0,979

The error contribution at low current is significantly higher than at nominal current. This
influence can be reduced by utilizing current transformers of class 0,2 S and 0,5 S.

– 20 – IEC 62053-24:2020 © IEC 2020
Annex D
(informative)
Treatment of harmonics and tests for harmonics
D.1 Non- sinusoidal conditions and reactive power definition
Many meter types designed prior to the establishment of this document exhibit large differences
in metered reactive energy under non-sinusoidal conditions (in the presence of harmonics).
Earlier standards for electricity meters for reactive energy were based on a definition of reactive
energy for sinusoidal currents and voltages. Consequently, they could not specify any
requirements for the performance under non-sinusoidal conditions.
In order to ensure that the differences in measurement results between different meter types
...