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IEC 60255-151 Ed. 1.0 b:2009
Measuring relays and protection equipment - Part 151: Functional requirements for over/under current protection
"IEC 60255-151:2009 specifies minimum requirements for over/under current relays. It includes a specification of the protection function, measurement characteristics and time delay characteristics. Defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. "
International Electrotechnical Commission [iec]
