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
|Publication Date:||1 July 2019|
|ICS Code (Power transmission and distribution networks in general):||29.240.01|
|ICS Code (Measurement of electrical and magnetic quantities):||17.220.20|
|ICS Code (Electrical insulation in general):||29.080.01|
This part of IEC 61557 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.
NOTE Common worldwide three-phase distribution systems are depicted in IEC 610101.