和 1 500 V DC 低压配电系统的电气安全 用于测试、测量或监测保护措施的设备 第 7 部分：相序

[中文适用范围]： IEC 61557-7:2019 RLV 包含官方 IEC 国际标准及其红线版本。 Redline 版本仅提供英文版本，为您提供了一种快速、简单的方法来比较官方 IEC 标准与其先前版本之间的所有更改。 IEC 61557-7:2019 规定了适用于测试三相配电系统相序的测量设备的要求。相序的指示可以是机械的、视觉的和/或听觉的。本文件不适用于其他数量的附加测量。它不适用于监控继电器。 IEC 61557-7:2019取消并取代了2007年发布的第二版。该版本构成技术修订版。该版本相对于前一版本包括以下变化： a) 结构与整个 IEC 61557 系列的结构一致； b) 根据新版IEC 61010-1和IEC 61010-031更新了4.3中的要求； c) 扩展了标记信息； d) 扩展了操作说明书的信息； e) 补充有关引线测试的信息； f) 引入了绝缘导体测试引线； g) 附件 B 增加了有关相序测试和指示的信息。 [外文原描述]： IEC 61557-7:2019 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 61557-7:2019 specifies the requirements applicable to measuring equipment for testing the phase sequence in three-phase distribution systems. Indication of the phase sequence can be mechanical, visual and/or audible. This document does not apply to additional measurements for other quantities. It does not apply to monitoring relays. IEC 61557-7:2019 cancels and replaces the second edition published in 2007. This edition constitutes a technical revision. This edition includes the following changes with respect to the previous edition: a) alignment of the structure with that of the whole IEC 61557 series; b) updated requirements in 4.3 in accordance with new editions of IEC 61010-1 and IEC 61010-031; c) the information on markings was extended; d) the information on the operating instructions was extended; e) complement to the information on the testing of leads; f) test leads for insulated conductors were introduced; g) Annex B was added with information on phase sequence tests and indications.