Over deze norm
IEC 60255-127 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.
||Meetrelais en beveiligingsmaterieel - Deel 127: Functionele eisen voor over- of onderstroombeveiliging
||Measuring relays and protection equipment - Part 127: Functional requirements for over/under voltage protection