REX640 Modification Sales Guideline - Grid automation - Bay control and measurement - Power management/Load shedding - Transformer protection - 3 winding - Interconnection protection - Merging unit - Generator protection - Auto synchronization - Capacitor bank protection - Back-up protection - Motor protection - Feeder protection - Arc protection - Petersen Coil control - Transformer protection - 2 winding - Voltage regulation - Busbar protection (voltage and frequency) - Busbar differential protection (high impedance) - Modification Sales Guideline - REX640 Protection and control - PCL1 - ANSI