For any given condition(sub-transient, transient or steady state),
draw the per unit reactance diagram, which will represents the
positive sequence network
Negative sequence network:
Determine the per unit negative sequence impedances of all
elements
If the value of the negative sequence is not mentioned for any
element, it can be approximately consider as equal to positive
sequence impedance
Zero Sequence network:
Draw the zero sequence network corresponding to the grounding
conditions of different elements of the power system.
Mention all the impedances by its zero sequence values.