Description of BS EN IEC 62053-23:2021 2021
IEC 62053-23:2020 applies only to static var-hour meters of
accuracy classes 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.
For practical reasons, this document is based on a
conventional definition of reactive energy for sinusoidal currents
and voltages containing the fundamental frequency only.
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;
• 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.
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;
• 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).
This second edition cancels and replaces the first edition
published in 2003 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:
a) Removed all meter safety requirements; the meter safety
requirements are covered in IEC 62052-31:2015.
b) Replaced Ib with In; Ib is no longer used when
referencing directly connected meters.
c) Moved the descriptions of all general requirements and
test methods from IEC 62053-21: 2003, IEC 62053-22: 2003, IEC
62053-23: 2003, IEC 62053-24: 2003 to IEC 62052-11:2020; IEC
62053-21:2020, IEC 62053-22:2020, IEC 62053-23:2020, IEC
62053-24:2020 contain only accuracy class specific requirements.
d) Added new requirements and tests concerning:
1) measurement uncertainty and repeatability (7.3, 7.8);
2) influence of fast load current variations (9.4.12);
3) immunity to conducted differential current disturbances
in the 2 kHz to 150 kHz frequency range (9.3.8).
e) Meters designed for operation with low power instrument
transformers (LPITs) may be tested for compliance with this
document as directly connected meters.
The reactive energy accuracy classes 2 and 3 defined in IEC
62053-23 have also been added to IEC 62053-24. The TC13 WG11 is of
the opinion that the testing methodology described in IEC 62053-24
is a better approach to testing of modern reactive energy meters.
Consequently, IEC 62053-23 will be withdrawn in the near future,
and should not be used for new meter designs.