Two limit value monitoring functions (LIM_1 and LIM_2) are implemented and can be assigned to both transformer ends.

For each limit value monitoring function, a setting parameter is provided for this assignment by the user. The function will then monitor the minimum and maximum phase currents for the selection. If a maximum phase current exceeds the relevant set threshold or if a minimum phase current falls below the relevant set threshold, a signal is issued once a set time has elapsed.

Function group LIM_1 will serve as an example to illustrate the operation of the limit value monitoring functions in the following figures.