Amendment 1 - Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - Part 12: Power metering and monitoring devices (PMD)

<p>Amendement 1 - Sécurité électrique dans les réseaux de distribution basse tension jusqu’à 1 000 V en courant alternatif et 1 500 V en courant continu - Dispositifs de contrôle, de mesure ou de surveillance de mesures de protection - Partie 12: Dispositifs de comptage et de surveillance du réseau électrique (PMD)</p>

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IEC 61557-12:2018/AMD1:2021 - Amendment 1 - Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - Part 12: Power metering and monitoring devices (PMD)
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IEC 61557-12
Edition 2.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Electrical safety in low voltage distribution systems up to 1 000 V AC and
1 500 V DC – Equipment for testing, measuring or monitoring of protective
measures –
Part 12: Power metering and monitoring devices (PMD)
Sécurité électrique dans les réseaux de distribution basse tension jusqu’à
1 000 V en courant alternatif et 1 500 V en courant continu – Dispositifs de
contrôle, de mesure ou de surveillance de mesures de protection –
Partie 12: Dispositifs de comptage et de surveillance du réseau électrique (PMD)
IEC 61557-12:2018-10/AMD1:2021-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61557-12
Edition 2.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Electrical safety in low voltage distribution systems up to 1 000 V AC and
1 500 V DC – Equipment for testing, measuring or monitoring of protective
measures –
Part 12: Power metering and monitoring devices (PMD)
Sécurité électrique dans les réseaux de distribution basse tension jusqu’à
1 000 V en courant alternatif et 1 500 V en courant continu – Dispositifs de
contrôle, de mesure ou de surveillance de mesures de protection –
Partie 12: Dispositifs de comptage et de surveillance du réseau électrique (PMD)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20; 29.080.01; 29.240.01 ISBN 978-2-8322-9662-2

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

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

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61557-12:2018/AMD1:2021
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION
SYSTEMS UP TO 1 000 V AC AND 1 500 V DC –
EQUIPMENT FOR TESTING, MEASURING OR
MONITORING OF PROTECTIVE MEASURES –
Part 12: Power metering and monitoring devices (PMD)
AMENDMENT 1
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,

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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

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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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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

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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 document may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

Amendment 1 to IEC 61557-12:2018 has been prepared by IEC technical committee 85:

Measuring equipment for electrical and electromagnetic quantities.
The text of this amendment is based on the following documents:
FDIS Report on voting
85/755/FDIS 85/764/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
---------------------- Page: 4 ----------------------
IEC 61557-12:2018/AMD1:2021 – 3 –
© IEC 2021
The language used for the development of this Amendment is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications/.

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

stability date indicated on the IEC website under 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.
___________
1 Scope
Replace the existing text of this clause by the following new text:

This part of IEC 61557 specifies requirements for power metering and monitoring devices (PMD)

that measure and monitor the electrical quantities within electrical distribution systems, and

optionally other external signals. These requirements also define the performance of PMD in

single- and three-phase AC or DC systems having rated voltages up to 1 000 V AC or up to

1 500 V DC.

These devices are fixed or portable. They are intended to be used indoors and/or outdoors.

Power metering and monitoring devices (PMD), as defined in this document, give additional

safety information, which aids the verification of the installation and enhances the performance

of the distribution systems.

Additionally, this document specifies requirements for measurement functions dedicated to

metering and monitoring of electrical parameters called power metering and monitoring function

(PMF) which can be embedded in equipment (EPMF) that is not classified as PMD and for which

the main function is not power metering and monitoring.

Requirements for power metering and monitoring function (PMF) and additional requirements

for equipment embedding power metering and monitoring function (EPMF) are described in

Annex H.

The power metering and monitoring devices (PMD) for electrical parameters described in this

document are used for general industrial and commercial applications.

The power metering and monitoring devices (PMD) can be associated with sensing devices

such as but not limited to instruments transformers compliant to IEC 61869 series of standards

or with transducers compliant to IEC 60688.
This document does not address functional safety and cyber security aspects.
---------------------- Page: 5 ----------------------
– 4 – IEC 61557-12:2018/AMD1:2021
© IEC 2021
This document is not applicable to:

– electricity metering equipment that complies with IEC 62053-21, IEC 62053-22, IEC 62053-

23 and IEC 62053-24. Nevertheless, uncertainties defined in this document for active and

reactive energy measurement are derived from those defined in IEC 62053 (all parts);

– the measurement and monitoring of electrical parameters defined in IEC 61557-2 to

IEC 61557-9 and IEC 61557-13 or in IEC 62020;
– power quality instrument (PQI) according IEC 62586 (all parts);

– devices covered by IEC 60051 (all parts) (direct acting analogue electrical measuring

instrument).

NOTE 1 Generally such types of devices are used in the following applications or for the following general needs:

– energy management inside the installation, such as facilitating the implementation of documents such as

ISO 50001 and IEC 60364-8-1;
– monitoring and/or measurement of electrical parameters;

– measurement and/or monitoring of the quality of energy inside commercial/industrial installations.

NOTE 2 A measuring and monitoring device of electrical parameters usually consists of several functional modules.

All or some of the functional modules are combined in one device. Examples of functional modules are:

– measurement and monitoring of several electrical parameters simultaneously;

– energy measurement and/or monitoring, as well as sometimes compliance with aspects of building regulations;

– alarms functions;

– demand side quality (current and voltage harmonics, over/under voltages, voltage dips and swells, etc.).

NOTE 3 PMD are historically called power meter, power monitor, power monitor device, power energy monitoring

device, power analyser, multifunction meter, measuring multifunction equipment, energy meters.

NOTE 4 Metering, measuring and monitoring applications are explained in Annex A.
3 Terms, definitions and notations
Add the following new definitions:
3.1.16
power metering and monitoring function
PMF

measurement function dedicated to metering and monitoring electrical parameters within

electrical distribution systems embedded in an equipment that is not a PMD and complies to

another IEC product standard
3.1.17
equipment embedding PMF
EPMF

equipment or arrangement of equipment embedding PMF whose main function is not metering

and monitoring of electrical parameters

Note 1 to entry: Such equipment are uninterruptible power systems (UPS), static transfer systems (STS), circuit

breakers, transfer switching equipment (TSE), switches, disconnectors, switch-disconnectors, fuse-combination

units, programmable controllers (PLC), inverter for use in photovoltaic power systems, adjustable speed electrical

power drive systems, protection relay, residual current devices (RCDs, RCBOs), residual current monitoring devices

(RCM), load-shedding equipment (LSE), bi-directional grid connected power converters.

---------------------- Page: 6 ----------------------
IEC 61557-12:2018/AMD1:2021 – 5 –
© IEC 2021
Add the following new Annex H:
Annex H
(normative)
Requirements for power metering and monitoring function (PMF)
and additional requirements for equipment embedding power
metering and monitoring function (EPMF)
H.1 Scope

This annex specifies additional requirements and tests for equipment embedding a power

metering and monitoring function (EPMF) whose main function is not measurement and its

embedded power metering and monitoring function (PMF).

When not otherwise stated in this annex, the core of this document is applied to EPMF or PMF

as appropriate when reading “PMD” in the core document.
NOTE The annex follows the same structure as the core document.
H.2 Normative references
Clause 2 applies.
In addition, the following standards apply:
IEC 60255 (all parts), Measuring relays and protection equipment

IEC 60755, General safety requirements for residual current operated protective devices

IEC 60898 (all parts), Electrical accessories – Circuit-breakers for overcurrent protection for

household and similar installations
IEC 60947-2, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers

IEC 60947-3, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors,

switch-disconnectors and fuse-combination units

IEC 60947-6-1, Low-voltage switchgear and controlgear – Part 6-1: Multiple function equipment

– Transfer switching equipment

IEC 61000-4-8, Electromagnetic compatibility (EMC) – Part 4-8: Testing and measurement

techniques – Power frequency magnetic field immunity test

IEC 61000-4-19, Electromagnetic compatibility (EMC) – Part 4-19: Testing and measurement

techniques – Test for immunity to conducted, differential mode disturbances and signalling in

the frequency range 2 kHz to 150 kHz at a.c. power ports

IEC 61008 (all parts), Residual current operated circuit-breakers without integral overcurrent

protection for household and similar uses (RCCBs)

IEC 61009 (all parts), Residual current operated circuit-breakers with integral overcurrent

protection for household and similar uses (RCBOs)
IEC 61131 (all parts), Programmable controllers
---------------------- Page: 7 ----------------------
– 6 – IEC 61557-12:2018/AMD1:2021
© IEC 2021
IEC 61800 (all parts), Adjustable speed electrical power drive systems
IEC 62020 (all parts), Electrical accessories – Residual current monitors (RCMs)
IEC 62040 (all parts), Uninterruptible power systems (UPS)

IEC 62109-2, Safety of power converters for use in photovoltaic power systems – Part 2:

Particular requirements for inverters
IEC 62310 (all parts), Static transfer systems (STS)

IEC 62423, Type F and type B residual current operated circuit-breakers with and without

integral overcurrent protection for household and similar uses
IEC 62909 (all parts), Bi-directional grid connected power converters
IEC 62962, Particular requirements for load-shedding equipment (LSE)
H.3 Terms, definitions and notations
Clause 3 applies.
H.4 Requirements for PMF and additional requirements for EPMF
H.4.1 General requirements

The equipment that may embed EPMF shall be chosen in the equipment list defined in Table H.1.

Table H.1 – List of equipment that may embed EPMF
Equipment IEC Standard
Uninterruptible power systems (UPS) IEC 62040 series
Static transfer systems (STS) IEC 62310 series
Circuit-breakers IEC 60947-2, IEC 60898 series
Transfer switching equipment (TSE) IEC 60947-6-1
Switches, disconnectors, switch-disconnectors and IEC 60947-3
fuse-combination units
Programmable controllers (PLC) IEC 61131 series
Inverter for use in photovoltaic power systems IEC 62109-2
Adjustable speed electrical power drive systems IEC 61800
Protection relay IEC 60255

Residual current devices (RCD, RCBO) IEC 61008 series, IEC 61009 series, IEC 62423,

IEC 60947-2, IEC 60755 series
Residual current monitoring devices (RCM) IEC 62020 series
Load-shedding equipment (LSE) IEC 62962
Bi-directional grid connected power converters IEC 62909 series

The requirements of 4.2 to 4.12 apply with the modifications specified in this annex.

H.4.2 EPMF general architecture

This subclause provides information about a possible implementation of a PMF in an EPMF.

---------------------- Page: 8 ----------------------
IEC 61557-12:2018/AMD1:2021 – 7 –
© IEC 2021

Figure H.1 shows the common organization of an EPMF including its main function and PMF.

Organization of the measurement chain of EPMF: the electrical quantity can be measured either

directly or via voltage and/or current sensors (see also H.4.4).

NOTE 1 It is not necessary that the parts in the dotted lines be included in PMF.

NOTE 2 I/O are analog and/or digital signals with alarms.
NOTE 3 Communications may be ensured by the EPMF or by the PMF part.
Figure H.1 – Example of architecture of EPMF
H.4.3 Classification of PMF
4.3 applies to PMF classified according to Table H.2.
Table H.2 – Functional classification of PMF with minimal required functions
PMF type
Functionalities
PMF-I PMF-II PMF-III
symbol
Energy efficiency Basic power Advanced power monitoring
monitoring /network performance
 
Q  
S  
  
 

f  
I  

U and/or V  
---------------------- Page: 9 ----------------------
– 8 – IEC 61557-12:2018/AMD1:2021
© IEC 2021
PMF type
Functionalities
PMF-I PMF-II PMF-III
symbol
Energy efficiency Basic power Advanced power monitoring
monitoring /network performance
PF  
THD and/or THD
u v
and/or THD-R and/or
THD-R
THD and/or THD-R

i i
Only total quantities are mandatory.

For PMF other than PMF-I, PMF-II and PMF-III, called PMF-x, other combinations of functions are allowed and

shall be specified by the manufacturer.
H.4.4 Structure of EPMF
4.4 applies to EPMF with the following modification.

Depending on the EPMF, the electrical quantity can be measured either directly or via voltage

and/or current sensors as shown in Table H.3.
Table H.3 – Structure of EPMF
Current measurement
Sensor operated EPMF Direct connected EPMF
(current sensors out of EPMF) (current sensors in EPMF)
EPMF Sx EPMF Dx
Direct connected EPMF EPMF SD EPMF DD
(voltage sensors in EPMF)
(Semi-direct insertion) (Direct insertion)
EPMF xD
Sensor operated EPMF EPMF SS EPMF DS
(voltage sensors out of EPMF)
(Indirect insertion) (Semi-direct insertion)
EPMF xS
H.4.5 List of applicable performance classes for PMF
4.5 applies.
H.4.6 Operating and reference conditions
H.4.6.1 Reference conditions

4.6.1 applies for performance class tests of the PMF. For other tests, reference test conditions

of the EPMF standard apply.
H.4.6.2 Rated operating conditions

If rated operating conditions are not defined by the standard of the equipment where PMF is

embedded, 4.6.2 applies.

NOTE Rated operating conditions may be also called environmental conditions (or similar wording) in other

standards.
Voltage
measurement
---------------------- Page: 10 ----------------------
IEC 61557-12:2018/AMD1:2021 – 9 –
© IEC 2021
H.4.7 Start-up conditions for EPMF
4.7 applies.
H.4.8 Requirements for PMF
All PMF embedded in an EPMF and covered by this document shall comply with the

requirements of this document given in 4.8 with the following modifications or additions.

Subclause 4.8 describes a list of functions. Depending on the purpose of the measurement, all

or a subset of the functions listed shall be measured by the PMF.

The starting current and the specified measuring range of current shall be chosen according to

the structure of EPMF given in Table H.3 and Table H.4.
Table H.4 – Value of current according to the type of EPMF

Structure of EPMF Starting current and specified measuring range of current identical to

EPMF Dx PMD Dx
EPMF Sx PMD Sx

In reference conditions, signals are sinusoidal, so in this case the power factor = cos ϕ, see Table 11.

For EMC influence quantities:
– If EMC requirements are covered by the standard of the equipment where PMF is
embedded, EMC levels and test conditions defined in the EPMF standard apply;

– If EMC requirements are not covered by the standard of the equipment where PMF is

embedded, 4.8 applies.

For temperature influence quantities, the influence range is based on the rated operating range

according to H.4.6.2.
H.4.9 General mechanical requirements

If mechanical requirements are not defined by the standard of the equipment where PMF is

embedded, 4.9 applies.
H.4.10 Safety requirements

An equipment safety standard required by the EPMF type shall apply. If safety requirements

are not defined by the product standard of equipment where PMF is embedded, 4.10 applies.

In addition, a risk assessment of the PMF shall be done. In case of doubt, IEC 61010-2-30 or

any relevant safety standard shall apply.
H.4.11 EMC requirements

If EMC requirements are not defined by the standard of the equipment where PMF is embedded,

4.11 applies.
H.4.12 Inputs and/or outputs

If inputs and/or outputs requirements are not defined by the standard of the equipment where

PMF is embedded, 4.12 applies.
---------------------- Page: 11 ----------------------
– 10 – IEC 61557-12:2018/AMD1:2021
© IEC 2021
H.5 Marking and operating instructions
H.5.1 General

If marking and operating instructions requirements are not covered by the standard of the

equipment where PMF is embedded, 5.1 applies.
H.5.2 Marking

At minimum if relevant, symbol 14 according to IEC 61010-1 shall be marked on the EPMF.

H.5.3 Operating, installation and maintenance instructions
H.5.3.1 General

If operating, installation and maintenance instructions requirements are not covered by the

standard of the equipment where PMF is embedded, 5.3.1 applies.
In addition, the following requirements apply:
H.5.3.2 General characteristics
5.3.2 applies.
H.5.3.3 Essential characteristics
H.5.3.3.1 Characteristics of EPMF

The characteristics of the EPMF shall be specified in a table as specified in Table H.5 with the

following items:
a) power quality assessment function (if any);
b) classification of the PMF and the EPMF according to H.4.3 and H.4.4;
c) temperature of the EPMF according to H.4.6.2;
d) humidity and altitude conditions of the EPMF according to H.4.6.2;

e) active power or active energy function (if existing) performance class according to 4.8.2 and

H.4.6.2.
The sequence of function symbols shall be the following, see Table H.5:
Table H.5 – EPMF specification form
Examples of possible characteristic Other complementary
Type of characteristic
value characteristics
Classification of PMF
PMF-I or PMF-II or PMF-III or PMF-x
according to H.4.3
Classification of EPMF SD or DS or DD or SS
according to H.4.4
Temperature K40 or K55 or K70 or Kx or specified
range for EPMF
Humidity + altitude Blank or extended values or specified
range for EPMF
Active power or active energy 0,1 or 0,2 or 0,5 or 1 or 2
function (if function available)
performance class

It is strongly recommended that all items be listed, and only existing ones be specified.

---------------------- Page: 12 ----------------------
IEC 61557-12:2018/AMD1:2021 – 11 –
© IEC 2021
H.5.3.3.2 Characteristics of functions

The characteristics of PMF shall be specified in a table as specified in Table 46 with the

following items:
a) function symbols as defined in Table 46;
b) function performance class according to this document;
c) measuring range for the specified performance class;
d) other complementary characteristics.
H.6 Tests
H.6.1 General

The tests of Clause 6 apply and shall be performed on EPMF with the following modifications

or additions.

Except otherwise stated, tests of Clause H.6 apply with the EPMF wired and set under normal

conditions of use.
Reference tests conditions of H.4.6.1 apply.
H.6.2 Type tests of EPMF
H.6.2.1 General

Type tests shall be executed to check the compliance with the requirements of Clause H.4 and

Clause H.5.
H.6.2.2 Tests of intrinsic uncertainty

As a general principle, each line of the intrinsic uncertainty tables in Clause 4 with conditions

defined in H.4.6 to H.4.8 shall be associated to a test with the minimum test points and

acceptance criterion given in 6.2.2.
H.6.2.3 Tests of variation of uncertainty with influence quantities

As a general principle, each line of the uncertainty with influence quantities tables in Clause 4

with conditions defined in H.4.6 to H.4.8 shall be associated to a test with the minimum test

points and acceptance criterion given in 6.2.3.
H.6.2.4 Test of temperature influence
6.2.4 applies with environmental conditions defined in H.4.6.
H.6.2.5 Active power
6.2.5 applies.
H.6.2.6 Apparent power
6.2.6 applies.
H.6.2.7 Power factor
6.2.7 applies.
---------------------- Page: 13 ----------------------
– 12 – IEC 61557-12:2018/AMD1:2021
© IEC 2021
H.6.2.8 Common mode voltage rejection test
No requirement.
H.6.2.9 Frequency
6.2.9 applies.
H.6.2.10 Measurement of voltage harmonics and THD
6.2.10 applies.
H.6.2.11 Measurement of current harmonics and THD
6.2.11 applies.
H.6.2.12 Dips and swells
6.2.12 applies.
H.6.2.13 Voltage interruptions
6.2.13 applies.
H.6.2.14 Outputs tests

If output tests are not covered by the standard of the equipment where PMF is embedded,

6.2.14 applies.
H.6.2.15 Climatic tests

Climatic tests of the standard of the equipment where PMF is embedded apply if def

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