UNE-EN IEC 62053-23:2021

This part of IEC 62053 applies only to newly manufactured 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 standard is based on a conventional definition of reactive energy for sinusoidal currents and voltages containing the fundamental frequency only.

Note 1: For other general requirements, such as safety, dependability etc., see the relevant IEC 62052 or IEC 62059 standards.

This International Standard applies to electricity metering equipment designed to:

" measure and control electrical energy on electrical networks (mains) with voltage up to 1,000 V a.c, or 1,500 V d.c.;

Note 2: For a.c. 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 sockets or racks;

" provide additional functions other than those for measurement of electrical energy.

Meters designed for operation with low power instrument transformers (LPITs as defined inthe IEC 61869 series of standards) may be considered as compliant with this international standard only if such meters and their LPITs are tested together, and meet the requirements for directly connected meters.

Note 3: 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 standard. However, the requirements for such functions are outside the scope of this standard.

Note 4: Product requirements for power monitoring devices 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 and one or more relevant IEC 62053-xx accuracy class standards.

Note 5: Product requirements for power quality monitoring instruments 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 International Standard does not apply to:

" meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1,000 V a.c, or 1,500 V d.c.;

" meters intended for connection with low power instrument transformers (LPITs as defined in the IEC 61869 series of standards) when tested without such transformers;

" metering systems comprising multiple devices physically remote from one another;

" portable meters;

Note 6: Portable meters are meters that are not permanently connected.

" meters used in rolling stock, vehicles 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 International Standard does not cover measures for detection and prevention of fraudulent attempts to compromise meter s performance (tampering). Nevertheless, the customer and the manufacturer may agree on specific tampering detection and prevention requirements, and test methods, as relevant for a particular market.

Note 7: Specifying requirements and test methods for fraud detection and prevention would be counterproductive, as such specifications would provide guidance for potential fraudsters.

Note 8: 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 9: billing systems, and in particular, smart metering systems, are capable of detecting irregular consumption patterns and irregular network losses which enable discovery of suspected meter tampering.

Note 10: For transformer operated meters paired with current transformers (CTs) according IEC 61869-2:

the standard CT measuring range is specified from 0.05 In to Imax for accuracy classes 0,1, 0,2, 0,5 and 1 and these CTs are used for meters of class 2 and 3 according to this standard;

the special CT measuring range is specified from 0,01 In to Imax for accuracy classes 0,2S and 0,5S and these CTs are used for meters of class 0,5S and 1S according to IEC 62053-24;

combinations of standards CTs and meters of class 0,5S and 1S may be agreed between manufacturers and customers;