Standards Development

Scope

This part of IEC 62053 applies only to transformer-operated or transducer-operated static watt-hour meters of accuracy classes 0,1 S, 0,2 S and 0,5 S for the measurement of alternating current electrical active energy in 50 Hz or 60 Hz networks and it applies to their type tests only.

NOTE 1 For other general requirements, such as safety, dependability, etc., see the relevant standards in the IEC 62052 or IEC 62059 series.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;

NOTE 2 For AC electricity meters, the voltage mentioned above is the line-to-neutral voltage derived from nominal voltages. See IEC 62052-31:2024, 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 external transducers may be tested for compliance with this document:

–        as directly connected meters, when such meters and their transducers are tested together;

–        as transducer-operated meters when such meters are tested without transducers.

NOTE 3 When transducer-operated meters are tested without transducers, the reference measurements may be performed at the input terminals of the meter. This may require, for example, a traceable reference energy meter (standard, French: étalon) with inputs compatible with mV or mA level transducer output signals. Another practical way to test transducer-operated meters is to perform the reference measurement at the input terminals of calibrated reference transducers. This way, the reference energy meters, and test current sources may be the same as those used for testing of transformer-operated meters. The transformation ratio, metrological characteristics and uncertainty of the reference transducers are known and their influence can be removed by post-processing the test data. The determination of the appropriate test methodology is left to the expertise of the testing laboratory.

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 IEC 62052-11:202X 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;

–        metering systems comprising multiple devices (except transducers) 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 types of meter tampering reported from various markets; therefore, designing meters to detect and prevent all types of tampering could 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 In to Imax for accuracy classes 0,1, 0,2, 0,5 and 1 and these CTs are used for meters of class 0,5, 1 and 2 according to IEC 62053-21;

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

–         combinations of standard CTs and meters of class 0,1 S, 0,2 S and 0,5 S are subject to an agreement between manufacturers and purchasers.

NOTE 13 This document does not specify emission requirements, these are specified in IEC 62052-11:202X, 9.3.14.