IEC 62053-21-2020 pdf free.Electricity metering equipment – Particular requirements – Part 21: Static meters for AC active energy (classes 0,5, 1 and 2).
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: 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 socket or rack:
• optionally, provide additional functions other than those for measurement of electrical energy.
Meters designed for operation with low power instrument transformers (LPITs as defined in the IEC 61869 series) may be tested for compliance with this document 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 document. However, the requirements for such functions are outside the scope of this document.
NOTE 4 Product requirements for power metering and monitoring devices (PUDs) and measurement functions such as voltage magnitude, current magnitude, power, frequency, etc.. are covered in IEC 61557-12. However, devices compliant with IEC 6 1557-12 are not Intended to be used as billing meters unless they are also compliant with IEC 62052-11:2020 and one or more relevant IEC 62053-xx accuracy class standards
NOTE 5 Product requirements for power quality Instruments (POls) 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
• meters intended for connection with low power instrument transformers (LPITs as defined in the IEC 61869 series) when tested without such transformers;
• metering systems comprising multiple devices (except LPITs) physically remote from one another;
• portable meters;
When testing poly-phase meters for compliance with Table 3 requirements for single phase loads, the test current shall be applied to each measuring element in sequence, while all the phase voltages shall remain balanced.
7.10 Limits of error due to influence quantities
Tests and test conditions given in IEC 62052-11:2020, 7.1 apply.
If the meter is rated for multiple connection modes, the accuracy requirements apply for each of the connection modes. All tests of effects of influence quantities shall be performed in one connection mode selected to exercise the complete metrological capability of the meter.
When the current and the phase displacement (power factor) are held constant as specified in Table 4, and any single influence quantity is applied one at a time, with the meter otherwise operated at reference conditions as specified in IEC 62052-11:2020, 7.1, the variation in percentage error relative to the intrinsic error shall not exceed the limits for the relevant class indexes given in Table 4.
The variation in percentage error induced by the influence quantities may vary depending on the value of the test current. The variation in percentage error in Table 4 is given for the specified values or ranges of the test current, but the testing should be performed at the recommended values of test current given in Table 4.IEC 62053-21 pdf download.