电能质量评估 - 公共电网供电特性

[中文适用范围]： IEC TS 62749:2026 RLV 包含该国际标准的正式版本及其带修订标记的版本。修订标记版仅提供英文版，便于快速比对本标准与其上一版本之间的所有变更。IEC TS 62749:2026 规定了公共低压、中压和高压 50 Hz 或 60 Hz 供电网络在供电点的电力特性预期要求，以及电能质量评估方法。本文件不适用于运行电压高于 230 kV 的系统。不同国家或地区各电压等级之间的界限可能有所差异。在本文件中，系统电压术语定义如下：低压（LV）指 UN ≤ 1 kV；中压（MV）指 1 kV < UN ≤ 35 kV；高压（HV）指 35 kV < UN ≤ 230 kV。由于现有网络结构，在某些国家或地区，中压与高压之间的界限可能有所不同。虽然电能质量在若干方面与电磁兼容性（EMC）相关，尤其因为电能质量要求的符合性取决于对所有或部分设备及安装产生的电磁发射累积效应的控制，但本文件并非电磁兼容性出版物（亦见附录 E）。本第三版取消并替代了 2020 年发布的第二版。与上一版本相比，本版包含以下重要技术变更：— 明确本文件推荐的谐波阶次最高至 40 次；— 相应修改第 4.6 条；— 重申本文件不适用于运行电压高于 230 kV 的系统；— 删除附录 C；— 完善第 4.10 条；— 更新及新增负荷曲线；— 修改以与 EN 50160:2022 及 EN 50160:2022/AMD1:2025 保持一致。 [外文原描述]： IEC TS 62749:2026 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC TS 62749:2026 specifies the expected characteristics of electricity at the point of supply of public low, medium and high voltage, 50 Hz or 60 Hz, networks, as well as power quality assessment methods. This document does not apply for systems operated above 230 kV. The boundaries between the various voltage levels can be different for different countries or regions. In the context of this document, the following terms for system voltage are used: - low voltage (LV) refers to UN ≤ 1 kV; - medium voltage (MV) refers to 1 kV < UN ≤ 35 kV; - high voltage (HV) refers to 35 kV < UN ≤ 230 kV. Because of existing network structures, in some countries or regions, the boundary between medium and high voltage can be different. While power quality is related to EMC in a number of ways, especially because compliance with power quality requirements depends on the control of cumulative effect of electromagnetic emission from all or multiple equipment and installations, this document is not an EMC publication (see also Annex E). This third edition cancels and replaces the second edition published in 2020. This edition includes the following significant technical changes with respect to the previous edition: - clarification that harmonic orders recommended in this document are up to 40th; - 4.6 is modified accordingly; - iteration that this document does not apply for systems operated above 230 kV; - deletion of Annex C; - improvement of 4.10; - update of profiles and addition of new profiles; - modifications to align with EN 50160:2022 and EN 50160:2022/AMD1:2025.