What is the reason for connecting a DC reactor in series with each pole of a converter station?

When laying a three-phase underground cable system in a flat formation, the primary reason for maintaining a specific spacing between cables is to ________.

High sensitivity in a protective relay ensures that the relay:

A ring distributor ABC is fed at A. The loads at B and C are 20 A at 0.8 p.f. lagging and 15 A at 0.6 p.f. lagging, respectively, both expressed with reference to the voltage at A. What will be the current components in sections AB and AC if the distributor is assumed to be fed from one end only as a radial equivalent for total load current calculation?