Method for determining ground-fault isolation in electric three-phase network, involves determining direction of ground faults in compensated phase network by considering zero phase active or zero sequence reactive energy system

摘要

The method involves determining the direction of ground faults in a compensated phase network by considering zero phase active energy or zero sequence reactive energy system. The active energy in zero-sequence system is determined using zero-sequence active power, residual voltage and ground current. An independent claim is included for apparatus for determining ground-fault isolation in electric three-phase network.