Merging unit and method of operating a merging unit

The invention relates to a merging unit (100), particularly for substation automation, comprising at least one input interface (110a, 110b) for receiving input data (ID) characterizing at least one voltage and/or current related to a component of a power system (200), wherein said merging unit (100) further comprises a control unit (120) that is configured to determine power quality information (PQ) depending on said input data (ID).