Research on Inverse Time Relay Protection Settings Adapted to Changes in Distribution Network Structure

In order to address the issue of traditional inverse time overcurrent protection failure caused by the connection of distributed power sources, this study proposes a protection parameter optimization method based on genetic algorithms. The construction of a multi-objective optimization model incorporating speed, selectivity and sensitivity enables the method to achieve adaptive setting of relay parameters while satisfying all engineering constraints. The simulation results demonstrate that the optimized protection strategy significantly reduces response time in typical fault scenarios, ensures stable compliance with coordination time intervals, and meets sensitivity requirements. Consequently, the strategy effectively enhances the accuracy of fault isolation and system stability in dynamic distribution grids.