IEC 60255-127-2010 Measuring relays and protection equipment – Part 127: Functional requirements for over/under voltage protection (Edition 1.0)
Relais de mesure et dispositifs de protection – Partie 127: Exigences fonctionnelles pour les protections à minimum et maximum de tension (Edition 1.0)
This part of IEC 60255 specifies minimum requirements for over/under voltage relays. The standard includes specification of the protection function@ measurement characteristics and time delay characteristics. This standard defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. The test methodologies for verifying performance characteristics and accuracy are also included in this standard. The general requirements for measuring relays and protection equipment are specified in IEC 60255-1.