This document provides instructions for drawing the per-unit impedance diagram of an electrical system shown in a figure using given base values of 20MVA and 66kV. It includes examples of impedance diagrams and continues with an exercise asking the reader to draw the per-unit impedance diagram for the system shown in the figure using the given base values.

1. Example 1
Example 2

2. Example 3

3. Example 3 (continued)

4. Example 4

5. Example 5

6. Example 5

7. Example 6

8. Example 6 (continued)
Exercise:
For the system shown in the figure below, draw the per-unit impedance diagram. Use the
base values of 20MVA and 66kV respectively.

9. Single line impedance diagram:

10. Solution: