CENELEC - EN 60255-151
Measuring relays and protection equipment - Part 151: Functional requirements for over/under current protection
|Publication Date:||1 October 2009|
|ICS Code (Relays):||29.120.70|
Scope and object
This part of IEC 60255 specifies minimum requirements for over/under current relays. This standard includes a specification of the protection function, measurement characteristics and time delay characteristics.
This part of IEC 60255 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.
This standard excludes thermal electrical relays as specified in IEC 60255-8. General requirements for measuring relays and protection equipment are specified in IEC 60255-1.