UNE-EN IEC 61557-12:2022

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 others external signals. These requirements also define the performance, in single and three-phase a.c. or d.c. systems having rated voltages up to 1 000 V a.c. or up to 1 500 V d.c. 285

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

This standard is not applicable for:

electricity metering equipment that complies with IEC 62053-21, IEC 62053-22,IEC 62053-23 and IEC 62053-24. Nevertheless, uncertainties defined in this standard for active and reactive energy measurement are derived from those defined in the IEC 62053 standards series.

the measurement and monitoring of electrical parameters defined in Parts 2 to 9 and part 13 of IEC 61557 or in IEC 62020

power quality instrument (PQI) according the IEC 62586 series of standards.

devices covered by series of standards IEC 60051 (direct acting analogue electrical measuring instrument)

This standard is intended to be used in conjunction with IEC 61557-1 (unless otherwise specified), which specifies the general requirements for measuring and monitoring equipment, as required in IEC 60364-6.

Power Metering and monitoring Devices (PMD), as defined in this standard, give additional safety information, which aids the verification of the installation and enhances the performance of the distribution systems. For instance, those devices help to check if the level of harmonics is still compliant with the wiring systems as required in IEC 60364-5-52.

The Power Metering and monitoring Devices (PMD) for electrical parameters described in this standard are used for general industrial and commercial applications.

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 standards like ISO 50001 and IEC 60364-8-1

monitoring and/or measurement of electrical parameters that may be required or usual;

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 mentioned below:

measurement and monitoring of several electrical parameters simultaneously;

energy measurement and/or monitoring, and also sometimes compliance with aspects of building regulations;

alarms functions;

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