Protection functionsProtection is one of the most important functionsof the REF 54_ feeder terminal. Theprotection function blocks (e.g. NOC3Low)are independent of each other and have e.g.their own setting groups and data recording.The non-directional overcurrent protectionincludes e.g. the three stages NOC3Low,NOC3High and NOC3Inst, each with independentprotection functions.Either Rogowski coils or conventional currenttransformers can be used for protectionfunctions based on current measurement.Correspondingly, voltage dividers or voltagetransformers are used for protection functionsbased on voltage measurementFor further information about functionalitylevels and the protection functions includedin them, refer to the table “Functionality levels,protection functions” in section“Ordering”.
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