Connecting power supply - 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

The permitted auxiliary voltage range is found on the protection relay's sticker.

  • Connect the protection relay's auxiliary voltage to slot G terminal X1:1-2.
  • Connect the positive lead to terminal X1:1.
Figure 1. Connecting auxiliary voltage
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