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There have been recent research activities on GPS-based FNET to prevent wide-area blackouts by monitoring frequency deviation. This study developed a system for monitoring regional frequencies in power grid modeling as an advanced research project for implementing intelligent wide-area protective relaying. The system was implemented by modeling an actual 345 kV transmission system using EMTP-RV and by measuring voltages and currents at 5 regions. The frequencies were estimated with a frequency estimation algorithm using gain compensation. The monitoring software implemented by this study was used to visualize frequency propagation effects and review simulation processes in various failure conditions.