The formula to calculate the Voltage Unbalance (VU) is:
\[ VU = \left( \frac{MD}{Vave} \right) \times 100 \]
Where:
Let's say the maximum deviation from the average voltage is 5 volts and the average voltage is 120 volts. Using the formula:
\[ VU = \left( \frac{5}{120} \right) \times 100 \]
We get:
\[ VU \approx 4.17 \% \]
So, the voltage unbalance is approximately 4.17%.