Sectionalize a 12 kV distribution network.

surinerd

I'm currently a student who is working on a Bachelor in Electrical Engineer project in order to graduate. My project is to sectionalize a 12 kV distribution network for an Oil Company located. My Question is: What components do I need if I want to do this? I know I will need an 12 kV rated sectionalizer, is this correct? We already have fuse cut outs, high voltage circuit breakers and reclosers in the network. The rated current of our distribution lines (SAX overhead cables) are 256 A.

And I also want to know how to calculate the maximum capacity of the transmission lines. what are the possibilities to increase this capacity?