The three-phase inrush detector function INRPHAR is used to detect transformer inrush situations in distribution networks.
Transformer inrush detection is based on the following principle: the output signal BLK2H is activated once the numerically derived ratio of second harmonic current I_2H and the fundamental frequency current I_1H exceeds the set value.
The operate time characteristic for the function is of definite time (DT) type.
The function contains a blocking functionality. Blocking deactivates all outputs and resets timers.