Checking environmental conditions and mounting space - Arc protection - Auto synchronization - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Petersen Coil control - Grid automation - Busbar differential protection (high impedance) - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Transformer protection - 3 winding - Interconnection protection - Generator protection - Power management/Load shedding - Installation Manual - REX640 Protection and control - PCL4 - IEC - ANSI - 16.02.2023

REX640 Installation Manual
The mechanical and electrical environmental conditions at the installation site must be within the limits described in the technical manual.
  • Avoid installation in dusty, damp places.
    Avoid places susceptible to rapid temperature variations, powerful vibrations and shocks, surge voltages of high amplitude and fast rise time, strong induced magnetic fields or similar extreme conditions.
  • Check that sufficient space is available.
    Sufficient space is needed at the front and rear of the protection relay to allow access to wires and optical fibers to provide sufficient ventilation to the protection relay and to enable maintenance and future modifications.
  • Ensure that flush-mounted protection relays can be added and replaced without excessive dismantling.
    CAUTION: If the UL enclosure rating should be higher than Type 1, the HMI unit must be installed behind an observation window. Only the HMI flush-mounting option is supported.

    UL listed observation windows:

    • FTTA/7, Model AMHMI120CCHTP, manufactured by Allied Moulded Products Inc, measuring overall 302.91 mm × 257.70 mm × 57.68 mm (11.9256 in × 10.1457 in × 2.2709 in), rated for 1, 2, 3, 3R, 4, 4X, 12 and 13.
    • Alternatively, any FTTA/7 or NITW rated for 1, 2, 3, 3R, 4, 4X, 12 and 13.