A direction is:
•a trace, starting from a source node and going through all the downstream cables, connections and reactance coils it can reach or
•a trace, starting from the secondary side of a transformer through all the downstream cables, connections and reactance coils it can reach.
The network below contains:
•one 150kV direction, from the source to the other 150kV node
•two 10kV directions, from the secondary side of the 150/10kV transformer down to the 10/0.4kV transformers
•two times two 0.4kV directions starting from both 10/0.4kV transformers
Example of a network with 7 directions