Primary values - Arc protection - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Grid automation - Busbar differential protection (high impedance) - Line differential protection - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Interconnection protection - Generator protection - Power management/Load shedding - IEC 61850 Engineering Guide - REX615 Protection and control - Relion Protection and Control - PCL2 - 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