The method of setting numerical protection differs considerably from that used for
electromechanical relays. Setting the parameters of a numerical protection, also
known as parameterisation, involves selecting the functions of system configuration,
protection, control, communication, alarms and reporting features. As with
conventional relays, settings for non-unit protections are determined on the basis of
short-circuit and coordination studies. For unit protection, settings do not depend
on coordination studies; therefore, machine constants, system parameters and
operation criteria are required in order to define the appropriate settings. Parameter
settings are achieved by carrying out the following operations