A dynamic current allocation algorithm for alienation coefficient based busbar fault discriminator

Alienation coefficient based busbar fault discriminator is one of the latest methods used to supervise the busbar differential protection schemes for detecting internal and external faults correctly. This fault discriminator uses alienation coefficient of current signals obtained from equivalent two-terminal busbar configuration to discriminate internal and external faults. This paper reports the impact of dynamic changes in network topology of power systems on the performance of alienation coefficient based fault discriminator. A Dynamic Current Allocation Algorithm (DCAA) is presented for the fault discriminator to address the impact of network topology alteration. The performance of the modified fault discriminator is validated by a simulation study. The results documented in this paper show the capability of modified fault discriminator in discriminating internal and external faults even when there is a dynamic change in network topology.