IEC 62053-21 pdf – Electricity metering equipment – Particular requirements – Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)
This part of lEC 62053 applies only to static watt-hour meters of accuracy classes 0,5,1 and 2for the measurement of alternating current electrical active energy in 50 Hz or 60 Hz networksand it applies to their type tests only.
NOTE 1 For other general requirements, such as safety，dependablty,etc. see the relevant IEC 62052 orIEC 62059 standards.
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 nominalvoltages. See lEC 62052-31:2015，Table 7.
. have all functional elements，including add-on modules，enclosed in, or forming a singlemeter 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 electricalenergy.
Meters designed for operation with low power instrument transformers (LPlTs as defined in the
IEC 61869 series)may be tested for compliance with this document only if such meters andtheir 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 qualiy parameters;load controlfunctions; delivery，time,test, accounting，recording functions; data communication interfaces and associated datasecurity functions. The relevant standards for these functions may apply in addition to the requirements of thisdocument. However,the requirements for such functions are outside the scope of this document.
NOTE 4 Product requirements for power metering and monitoring devices (PMDs) and measurement functions suchas voltage magnitude,current magnitude，power，frequency、etc.，are covered in IEC 61557-12. However， devicescompliant with IEC 61557-12 are not intended to be used as biling meters unless they are also compliant withIEC62052-11:2020 and one or more relevant lEC 62053-xaccuracy class standards.
NOTE 5 Product requirements for power quality instruments (PQls) are covered in lEC 62586-1. Requirements forpower quality measurement techniques (functions) are covered in iEC 61000-4-30. Requirements for testing of thepower quality measurement functions are covered in lEC 62586-2.
This document does not apply to:
. meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 00o v
meters intended for connection with low power instrument transformers (LPIlTs as definedin the lEC 61869 series) when tested without such transformers;
metering systems comprising multiple devices (except LPITs) physically remote from oneanother;
NOTE 6 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 attemptsto compromise a meter’s performance (tampering).
NOTE 7 Nevertheless,specific tampering detection and prevention requirements,and test methods，as relevant fora particular market are subject to the agreement between the manufacturer and the purchaser.
NOTE 8 Specifying requirements and test methods for fraud detection and prevention would be counterproductive,as such specifications would provide guidance for potential fraudsters.
NOTE 9 There are many types of meter tampering reported from various markets; therefore,designing meters todetect and prevent all types of tampering could lead to unjustified increase in costs of meter design,verification andvalidation.
NOTE 10 Biling systems,such as, smart metering systems，are capable of detecting irregular consumption patternsand irregular network losses which enable discovery of suspected meter tampering.
NOTE 11 For transformer operated meters paired with current transformers (CTs)according to IEC 61869-2:- the standard CT measuring range is specified from 0,05 Into Fmam 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 this document;
the special CT measuring range is specified from 0,01 In to lmax for accuracy classes 0,2 s and 0,5 s and theseCTs are used for meters of class 0,1 S,0,2 S and 0,5 S according to 62053-22:2020;
combinations of standard CTs and meters of class 0,1 S, 0.2 S and 0,5 S are subject to an agreement betweenmanufacturersand purchasers.
NOTE 12 This document does not specify emission requirements, these are specified in lEC 62052-11:2020，9.3.14.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document.For dated references, only the edition cited applies.
For undated references,the latestedition of the referenced document(including anyamendments) applies.
IEC 62052-11:2020 ，Electricity metering equipment – General requirements， tests and testconditions – Part 11: Metering equipment
3Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62052-11:2020 apply.
lsO and lEC maintain terminological databases for use in standardization at the followingaddresses:
.IEC Electropedia website: http://www.electropedia.orgl
.lso Online Browsing Platform website: http://www.iso.orglobp