电能质量评估.公用电网供电的特性

[中文适用范围]： 本技术规范规定了公共低、中、高压电网供电终端点处电能的预期特性，以及电能质量评估方法。 注1：不同国家/地区间各种电压等级的分界可能有所不同。在本技术规范中，系统电压使用以下术语： - 低电压（LV）指Un ≤ 1kV； - 中电压（MV）指1kV < Un ≤ 35kV； - 高电压（HV）指35kV < Un ≤ 230kV。 注2：由于现有网络结构的原因，某些国家/地区中压和高压的分界可能有所不同。 本文件适用于表1所列现象。 表1 - 电能质量指标涉及的电磁现象分类 | 连续现象 | 非连续现象-事件 | 其他现象 | |-----------|------------------|----------| | 频率偏差 | 供电中断 | 电网通信电压 | | 供电电压偏差 | 电压暂降 | | | 电压不平衡 | 电压暂升 | | | 谐波电压 | 瞬态过电压 | | | 间谐波电压 | 快速电压变化 | | | 闪变（电压波动） | | | | 电网信号电压 | | | 注3：相关测量方法的规范见IEC 61000-4-30《电磁兼容性(EMC) - 第4-30部分：测试和测量技术 - 电能质量测量方法》。 注4：相关测量仪器性能的规范见IEC 62586《供电系统电能质量测量》。 虽然电能质量与电磁兼容性(EMC)在多方面相关，特别是因为电能质量要求的符合性取决于对所有/多个设备和/或装置的电磁发射累积效应的控制，但本文件不是EMC出版物（另见附录F）。 [外文原描述]： IEC TS 62749:2020 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 62749:2020 specifies the expected characteristics of electricity at the SUPPLY TERMINALS of public low, medium and high voltage, 50 Hz or 60 Hz, networks. NOTE 1 The boundaries between the various voltage levels can be different for different countries/regions. In the context of this TS, the following terms for system voltage are used: - low voltage (LV) refers to less than or equal to 1 kV; - medium voltage (MV) refers to between 1 kV and 35 kV; - high voltage (HV) refers to between 35 kV and 230 kV. While power quality is related to EMC in a number of ways this document is not an EMC publication. This second edition cancels and replaces the first edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) minimum number of remaining data for weekly analysis, b) improvement of the compatibility between EN 50160 and IEC TS 62749, c) further explanation of the conception of daily sliding window, d) further explanation of the aggregation method used for events, e) further explanation of the relation between Power Quality and EMC, f) addition of a new definition of mains communicating system (MCS), g) addition of a new Annex G: Other phenomena, h) transfer of the main content of IEC TR 62510 to IEC TS 62749.