IEC 62052-11-2020 pdf free.Electricity metering equipment – General requirements, tests and test conditions – Part 11: Metering equipment.
This document also covers the common aspects of accuracy testing such as reference conditions, repeatability and measurement of uncertainty.
This document does not apply to:
• meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 000 V AC, or 1 500 V DC;
• 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 (except of LPITs) physically remote from one another:
• portable meters;
NOTE 9 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;
NOTE 10 Nominal values, accuracy classes, requirements and test methods for reference standard meters are specified in IEC 62057-1: —.
• 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 meters performance (tampering).
NOTE 11 Nevertheless, specific tampeflng detection and prevention requirements, and test methods, as relevant for a particular market are subject to agreement between the manufacturer and the purchaser.
NOTE 12 Specifying requirements and test methods for fraud detection and prevention would be counterproductive. as such specifications would provide guidance for potential traudsters,
NOTE 13 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 14 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.
meter type for electromechanical meter
meter design, manufactured by one manufacturer, having:
a) similar metrological properties;
b) the same uniform construction of parts determining these properties;
c) the same ratio of the maximum current to the nominal current;
d) the same number of ampere-turns for the current winding at nominal current and the same number of turns per volt for the voltage winding at nominal voltage.
Note I to entry: The type may have several values of nominal current and nominal voltage.
Note 2 to entry: Meters are designated by the manufacturer by one or more groups of letters or numbers, or a combination of letters and numbers. Each type has one designation only.
Note 3 to entry: The type Is represented by the sample meter(s) Intended for the type tests. In which characteristics (nominal current and nominal voltage) are chosen from the values given in the tables proposed by the manufacturer
Note 4 to entry: Where the number of ampere-turns would lead to a number of turns other than a whole number. the product of the number of turns of the wlndings by the value of the nominal current may differ from that of the sample meter(s) representative of the type.
It Is advisable to choose the next number immediately above or below in order to have whole numbers of turns.
For this reason only, the number of turns per volt of the voltage windings may differ, but by no more than 20 % from that of the sample meters representative of the type,
Note 5 to entry: The ratio of the highest to the lowest basic speed of the rotors of each of the meters of the same type shall not exceed 1,5.IEC 62052-11 pdf download.