Directional relaying of series compensated line using an integrated approach

This paper presents a directional relaying algorithm based on voting technique for the protection of series compensated line where the capacitors are present at both the ends of the line. The directional relaying issues in series compensated line related to voltage inversion, current inversion, high resistance fault and load change are addressed. Four classifiers based on positive and negative sequence components are selected and integrated using the voting technique to derive the final decision. The technique is evaluated using data simulated with EMTDC/PSCAD for a series compensated line and the dynamic performance of the algorithm is also studied. The integration approach is found to be advantageous.