What is the per Unit (p.u.) for a 345 kV nominal voltage that is currently at 348 kV?

To determine the per unit (p.u.) value for a system, the formula used is:

[ \text{p.u. value} = \frac{\text{Actual Value}}{\text{Base Value}} ]

In this case, the actual voltage is 348 kV, and the base voltage is the nominal voltage of 345 kV.

Applying the values to the formula:

[ \text{p.u. value} = \frac{348 \text{ kV}}{345 \text{ kV}} ]

Calculating this gives:

[ \text{p.u. value} = 1.0087 ]

When rounded to three significant figures, this results in a per unit value of approximately 1.008 p.u.

This indicates that the actual voltage is slightly higher than the nominal base voltage, showing how much the voltage is over its nominal value in a standardized form. This is significant in power systems to assess and compare voltages relative to their base levels, ensuring that operational parameters stay within safe and efficient ranges.

Thus, the per unit value of 1.008 p.u. accurately reflects this relationship, validating the choice.