15
4
Protection functions 16
Earth fault external toroid 16
Protection against earth fault (51N) 16
Selection of threshold Io> value 16
Selection of type of Io> curve 17
Selection of to> trip time 17
Protection against instantaneous or delayed earth fault (50N) 18
Selection of Io>> threshold value 18
Selection of to>> trip time 18
Rated and setting currents 19
PR512/P (50-51-50N-51N) UNIT
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