Connecting protective earthing to local HMI - 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 - Relion Protection and Control - PCL4 - IEC - ANSI - 16.02.2023

REX640 Installation Manual

Connect the LHMI to earth using an earth lead of at least 6.0 mm2 (AWG 10).

  1. Loosen the protective earth screw T20 on the LHMI to connect a separate earth protection lead.
    Figure 1. Loosening protective earth screw T20
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  2. Tighten the protective earth screw to 1.5 Nm ±10% (1.1063 ft-lb ±10%).