applications use three current values (one from each terminal) for the evaluation of the Bias and Differential
currents.
Line differential protection requires the comparison of power system quantities taken at the different line
terminals. For a meaningful comparison, synchronisation of the current signals is needed so that they are related
to a common time reference. Different methods are used to achieve current signal synchronisation – some
requiring external time reference signals, and some using internal timing signals.
P543i/P545i Chapter 6 - Current Differential Protection
P54x1i-TM-EN-1 101
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