Primary values - 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 - IEC 61850 Engineering Guide - REX640 Protection and control - Relion Protection and Control - PCL6 - IEC - ANSI - 14.02.2023

By default, the relay is in nominal mode. If system engineering requires it, MMS monitoring can be set to primary mode.

Table 1. Parameter Unit mode

Parameter	Values	Menu path
Unit mode	1=Primary; 0=Nominal	Configuration > Communication > Protocols > MMS