IEC 61557-7:20 19作为IEC 61557-7:20 19 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 61557-7:20 19规定了适用于测试三相配电系统相序的测量设备的要求。相位序列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 61557-7:20 19取消并取代了2007年发布的第二版。本版构成技术修订版。与上一版相比，此版本包括以下更改: a)结构与整个IEC 61557系列的结构对齐；b)根据新版IEC 61010-1和IEC 61010-031更新了4.3中的要求； c)扩大了关于标记的信息； d)关于操作说明的信息被扩展； e)补充关于导线测试的信息； f)引入了绝缘导体的测试引线； g)增加了有关相序试验和适应症的信息的附件B。

IEC 61557-7:2019 is available as IEC 61557-7:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the 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.