标准摘要
[中文适用范围]： IEC 61557 的这一部分规定了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。 IEC 61557 的这一部分不适用于其他量的辅助测量设备，例如包含附加相序指示器的电压测试仪。它不适用于监控继电器。注：相位灯不被视为电压测试仪。 [外文原描述]： This part of IEC 61557 specifies the requirements for measuring equipment applied to testing the phase sequence in three-phase distribution systems. Indication of the phase sequence may be mechanical, visual and/or audible. This part of IEC 61557 does not apply to ancillary measuring equipment for other quantities, for example voltage testers comprising an additional phase sequence indicator. It does not apply to monitoring relays. This second edition cancels and replaces the first edition published in 1997. This edition constitutes a minor revision.
英文名称Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 7: Phase sequence