61557-7-2007 Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1 500 V c.c. – Dispositifs de contr?le@ de mesure ou de surveillance de mesures de protection – Partie 7: Ordre de phases (Edition 2.0)
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 (Edition 2.0)
Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1 500 V c.c. – Dispositifs de contr?le@ de mesure ou de surveillance de mesures de protection – Partie 7: Ordre de phases (Edition 2.0) 是非强制性国家标准,您可以免费下载前三页
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. NOTE Phase lamps are not considered to be voltage testers.