REX640 Function Description - Arc protection - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Petersen Coil control - Grid automation - Back-up protection - Busbar differential protection (high impedance) - Motor protection - Auto synchronization - Busbar protection (voltage and frequency) - Transformer protection - 3 winding - Interconnection protection - Generator protection - Power management/Load shedding - Function Description - REX640 Protection and control - PCL2 - IEC