A phase selector based on mathematical morphology for double circuit transmission lines

There are problems arising in fault type classification in double circuit transmission lines due to the mutual coupling between the two circuits under fault conditions. A novel fault phase selection scheme is proposed in this paper, which provides an approach to accurately classify the fault types by dealing with six-phase and a model currents using a morphological transformation. The fault characteristics can be effectively extracted from the associating currents by the morphological transformation. The fault phase selection scheme is tested on a simulation model under different fault types, location, resistance and inception angle. All the test results show that the proposed scheme is well suited for classifying fault types in double circuit transmission lines.