Efficiency of admitance relays during faults with high fault resistance values in MV networks

In this paper efficiency of the different types of the admittance criteria is described during faults with high value of the fault resistance. The two types of fault are considered: high- ohm resistance in the fault loop and unbalance of the phase load caused by discontinuity of the line feeder with simultaneous occurrence of the ground-fault located behind the gap. Values of the zero sequence signals of current and voltage during those types of faults are shown.