Adaptive Zone-1 Setting Following Structural and Operational Changes in Power System

Change in network structure or operating condition in a power system affects the impedance as calculated by distance relay during fault. Such changes may lead to malfunction of distance relay at times. In this paper an adaptive distance relay setting method using local data is proposed to prevent zone-1 malfunction following structural and operational changes. The performance of proposed adaptive setting method is tested on 39-bus New England system and a generic 12-bus power system using PSCAD/EMTDC simulation data and a comparative assessment is also provided.