电能计量设备（交流） 特殊要求- 第21部分 静态有功电能表（1类和2类）

[中文适用范围]： 本文档仅适用于精度等级为0.5、1和2的交流电能静态瓦特时计，用于在50 Hz或60 Hz电网中测量交流有功电能，且仅适用于其型式试验。 本文档适用于旨在满足以下条件的电能计量设备： • 测量和控制电压高达1 000 V的电网（市电）上的电能； • 所有功能元件（包括附加模块）均封闭在单个电表外壳中或构成单个电表外壳，指示器除外； • 配备集成或独立的指示器，或不配备指示器； • 安装在指定的匹配插座或机架中； • 可选地提供除电能计量之外的其他功能。 设计用于与低压仪器变压器（LPIT，定义见IEC 61869系列）配合使用的电表，仅在与LPIT一起测试且满足直接连接电表要求时，方可进行符合本文档的测试。 本文档不适用于： • 从中性点导出的相电压超过1 000 V的电表； • 设计用于连接低压仪器变压器（LPIT，定义见IEC 61869系列），但在不连接此类变压器的情况下进行测试的电表； • 由多个设备（LPIT除外）组成且物理上相互远离的计量系统； • 便携式电表； • 用于轨道车辆、车辆、船舶和飞机的电表； • 实验室和电表测试设备； • 参考标准电表； • 与电表寄存器之间的数据接口； • 用于安装电能计量设备的匹配插座或机架； • 电能电表提供的任何其他功能。 [外文原描述]： IEC 62053-21:2020 applies only to static watt-hour meters of accuracy classes 0,5, 1 and 2 for the measurement of alternating current electrical active energy in 50 Hz or 60 Hz networks and it applies to their type tests only. 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 AC; • 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. This document does not apply to: • meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 000 V AC; • 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; • 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). This second edition cancels and replaces the first edition published in 2003 and its amendment 1:2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Removed all meter safety requirements; the meter safety requirements are covered in IEC 62052-31: 2015. b) Replaced Ib with In; Ib is no longer used when referencing directly connected meters. c) Moved the descriptions of all general requirements and test methods from IEC 62053-21: 2003, IEC 62053-22: 2003, IEC 62053-23: 2003, IEC 62053-24: 2003 to IEC 62052-11:2020; IEC 62053-21:2020, IEC 62053-22:2020, IEC 62053-23:2020, IEC 62053-24:2020 contain only accuracy class specific requirements. d) Added new requirements and tests concerning: 1) measurement uncertainty and repeatability (7.3, 7.8); 2) influence of fast load current variations (9.4.12); 3) immunity to conducted differential current disturbances in the 2 kHz to 150 kHz frequency range (9.3.8). e) Meters designed for operation with low power instrument transformers (LPITs) may be tested for compliance with this document as directly connected meters.